Hawaiian Electric Company, Inc. PFD K 4.65% (HAWLL) 10-K 28 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 13, 2019	Jun. 30, 2018
Entity Information [Line Items]
Entity Registrant Name	HAWAIIAN ELECTRIC INDUSTRIES INC
Entity Central Index Key	354,707
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 3,734,558,104
Entity Common Stock, Shares Outstanding		108,936,902
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Hawaiian Electric Company, Inc. and Subsidiaries
Entity Information [Line Items]
Entity Registrant Name	HAWAIIAN ELECTRIC COMPANY INC
Entity Central Index Key	46,207
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		16,751,488
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Revenues	$ 2,860,849	$ 2,555,625	$ 2,380,654
Expenses
Total expenses	2,527,493	2,209,392	2,024,816
Operating income (loss)
Operating income	333,356	346,233	355,838
Merger termination fee	0	0	90,000
Retirement defined benefits expense—other than service costs	(5,962)	(7,942)	(7,663)
Interest expense, net – other than on deposit liabilities and other bank borrowings	(88,677)	(78,972)	(75,803)
Allowance for borrowed funds used during construction	4,867	4,778	3,144
Allowance for equity funds used during construction	10,877	12,483	8,325
Income before income taxes	254,461	276,580	373,841
Income taxes	50,797	109,393	123,695
Net income (loss)	203,664	167,187	250,146
Preferred stock dividends of subsidiaries	1,890	1,890	1,890
Net income for common stock	$ 201,774	$ 165,297	$ 248,256
Basic earnings per common share (in dollars per share)	$ 1.85	$ 1.52	$ 2.30
Diluted earnings per common share (in dollars per share)	$ 1.85	$ 1.52	$ 2.29
Weighted-average number of common shares outstanding (in shares)	108,855	108,749	108,102
Net effect of potentially dilutive shares (in shares)	291	184	207
Weighted-average shares assuming dilution (in shares)	109,146	108,933	108,309
Electric utility
Revenues
Revenues	$ 2,546,525	$ 2,257,566	$ 2,094,368
Expenses
Total expenses	2,304,864	1,994,042	1,804,298
Operating income (loss)
Operating income	241,661	263,524	290,070
Income before income taxes	180,426	205,145	229,113
Income taxes	34,778	83,199	84,801
Net income (loss)	145,648	121,946	144,312
Preferred stock dividends of subsidiaries	1,995	1,995	1,995
Net income for common stock	143,653	119,951	142,317
Bank
Revenues
Revenues	314,275	297,640	285,924
Expenses
Total expenses	206,040	198,104	197,697
Operating income (loss)
Operating income	108,235	99,536	88,227
Income before income taxes	106,578	98,716	87,352
Income taxes	24,069	31,719	30,073
Net income (loss)	82,509	66,997	57,279
Preferred stock dividends of subsidiaries	0	0	0
Net income for common stock	82,509	66,997	57,279
Other
Revenues
Revenues	49	419	362
Expenses
Total expenses	16,589	17,246	22,821
Operating income (loss)
Operating income	(16,540)	(16,827)	(22,459)
Income before income taxes	(32,543)	(27,281)	57,376
Income taxes	(8,050)	(5,525)	8,821
Net income (loss)	(24,493)	(21,756)	48,555
Preferred stock dividends of subsidiaries	(105)	(105)	(105)
Net income for common stock	$ (24,388)	$ (21,651)	$ 48,660

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income for common stock	$ 201,774	$ 165,297	$ 248,256
Net unrealized losses on available-for sale investment securities:
Net unrealized losses on available-for sale investment securities arising during the period, net of tax benefits of $3,468, $2,886 and $3,763 for 2018, 2017 and 2016, respectively	(9,472)	(4,370)	(5,699)
Reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil and $238 for 2018, 2017 and 2016, respectively	0	0	(360)
Derivatives qualified as cash flow hedges:
Effective portion of foreign currency hedge net unrealized losses arising during the period, net of tax benefits of nil, nil and $179 for 2018, 2017 and 2016, respectively	0	0	(281)
Unrealized interest rate hedging gain (loss), net of tax (expense) benefit of $151, nil and nil for 2018, 2017 and 2016, respectively	(436)	0	0
Reclassification adjustment to net income, net of (taxes) benefits of nil, $289 and $(76) for 2018, 2017 and 2016, respectively	0	454	(119)
Retirement benefit plans:
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively	(28,101)	65,531	(43,510)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively	21,015	15,737	14,518
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively	8,325	(78,724)	28,584
Other comprehensive income (loss), net of taxes	(8,669)	(1,372)	(6,867)
Comprehensive income attributable to Hawaiian Electric Company, Inc.	$ 193,105	$ 163,925	$ 241,389

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net unrealized gains (losses) on securities arising during the period, tax (benefits)	$ (3,468)	$ (2,886)	$ (3,763)
Reclassification adjustment for net realized gains included in net income, tax expenses	0	0	238
Foreign currency hedge net unrealized loss, tax benefits	0	0	179
Unrealized interest rate hedging gain (loss), net of tax (expense) benefit	(151)	0	0
Reclassification adjustment to net income, (taxes) benefits		(289)	76
Net gains (losses) arising during the period, (taxes) benefits	(9,810)	41,129	(27,703)
Amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits	7,317	10,041	9,267
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, (taxes) benefits	$ (2,887)	$ 49,523	$ (18,206)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 169,208	$ 261,881
Accounts receivable and unbilled revenues, net	325,672	263,209
Available-for-sale investment securities, at fair value	1,388,533	1,401,198
Held-to-maturity investment securities, at amortized cost	141,875	44,515
Stock in Federal Home Loan Bank, at cost	9,958	9,706
Loans held for investment, net	4,790,902	4,617,131
Loans held for sale, at lower of cost or fair value	1,805	11,250
Property, plant and equipment, net
Land	102,925	102,588
Plant and equipment	7,118,709	6,598,751
Construction in progress	267,714	312,204
Property, plant and equipment, gross	7,489,348	7,013,543
Less – accumulated depreciation	(2,659,230)	(2,553,295)
Total property, plant and equipment, net	4,830,118	4,460,248
Regulatory assets	833,426	869,297
Other	530,364	513,535
Goodwill	82,190	82,190
Total assets	13,104,051	12,534,160
Liabilities
Accounts payable	214,773	193,714
Interest and dividends payable	28,254	25,837
Deposit liabilities	6,158,852	5,890,597
Short-term borrowings—other than bank	73,992	117,945
Other bank borrowings	110,040	190,859
Long-term debt, net—other than bank	1,879,641	1,683,797
Deferred income taxes	372,518	388,430
Regulatory liabilities	950,236	880,770
Defined benefit pension and other postretirement benefit plans liability	538,384	509,514
Other	580,788	521,018
Total liabilities	10,907,478	10,402,481
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293	34,293
Commitments and contingencies
Shareholders' equity
Preferred stock, no par value, authorized 10,000,000 shares; issued: none	0	0
Common stock, no par value, authorized 200,000,000 shares; issued and outstanding: 108,879,245 shares and 108,787,807 shares at December 31, 2018 and 2017, respectively	1,669,267	1,662,491
Retained earnings	543,623	476,836
Accumulated other comprehensive loss, net of tax benefits
Net unrealized losses on securities	(24,423)	(14,951)
Unrealized losses on derivatives	(436)	0
Retirement benefit plans	(25,751)	(26,990)
Accumulated other comprehensive loss, net of tax benefits	(50,610)	(41,941)
Total shareholders’ equity	2,162,280	2,097,386
Total capitalization and liabilities	$ 13,104,051	$ 12,534,160

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - shares	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, authorized shares	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, authorized shares	200,000,000	200,000,000
Common stock, issued shares	108,879,245	108,787,807
Common stock, outstanding shares	108,879,245	108,787,807

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock	Retained earnings	AOCI
Beginning Balance at Dec. 31, 2015	$ 1,927,640	$ 1,629,136	$ 324,766	$ (26,262)
Balance (in shares) at Dec. 31, 2015		107,460,000
Increase (decrease) in stockholders' equity
Net income for common stock	248,256		248,256
Other comprehensive income (loss), net of tax benefits	(6,867)			(6,867)
Issuance of common stock: Dividend reinvestment and stock purchase plan	26,844	$ 26,844
Issuance of common stock: Dividend reinvestment and stock purchase plan (in shares)		859,000
Issuance of common stock: Retirement savings and other plans	9,298	$ 9,298
Issuance of common stock: Retirement savings and other plans (in shares)		264,000
Issuance of common stock: Expenses and other, net	(4,368)	$ (4,368)
Common stock dividends	(134,050)		(134,050)
Ending Balance at Dec. 31, 2016	2,066,753	$ 1,660,910	438,972	(33,129)
Balance (in shares) at Dec. 31, 2016		108,583,000
Increase (decrease) in stockholders' equity
Net income for common stock	165,297		165,297
Other comprehensive income (loss), net of tax benefits	(1,372)			(1,372)
Reclass of AOCI for tax rate reduction impact	0		7,440	(7,440)
Issuance of common stock: Retirement savings and other plans	4,664	$ 4,664
Issuance of common stock: Retirement savings and other plans (in shares)		205,000
Issuance of common stock: Expenses and other, net	(3,083)	$ (3,083)
Common stock dividends	(134,873)		(134,873)
Ending Balance at Dec. 31, 2017	$ 2,097,386	$ 1,662,491	476,836	(41,941)
Balance (in shares) at Dec. 31, 2017	108,787,807	108,788,000
Increase (decrease) in stockholders' equity
Net income for common stock	$ 201,774		201,774
Other comprehensive income (loss), net of tax benefits	(8,669)			(8,669)
Issuance of common stock: Retirement savings and other plans	2,650	$ 2,650
Issuance of common stock: Retirement savings and other plans (in shares)		91,000
Issuance of common stock: Expenses and other, net	4,126	$ 4,126
Common stock dividends	(134,987)		(134,987)
Ending Balance at Dec. 31, 2018	$ 2,162,280	$ 1,669,267	$ 543,623	$ (50,610)
Balance (in shares) at Dec. 31, 2018	108,879,245	108,879,000

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Common stock dividends (in dollars per share)	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 1.24	$ 1.24	$ 1.24

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 203,664	$ 167,187	$ 250,146
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	214,036	200,658	194,273
Other amortization	41,593	21,340	10,473
Provision for loan losses	14,745	10,901	16,763
Loans originated and purchased, held for sale	(109,537)	(115,104)	(236,769)
Proceeds from sale of loans, held for sale	112,182	127,951	236,062
Deferred income taxes	(9,368)	37,835	47,118
Share-based compensation expense	7,792	5,404	4,789
Allowance for equity funds used during construction	(10,877)	(12,483)	(8,325)
Other	(4,219)	(3,324)	(12,422)
Changes in assets and liabilities
Increase in accounts receivable and unbilled revenues, net	(64,321)	(12,875)	(898)
Decrease (increase) in fuel oil stock	7,054	(20,794)	4,786
Decrease (increase) in regulatory assets	9,252	(17,256)	(18,273)
Increase (decrease) in accounts, interest and dividends payable	21,528	34,985	(9,643)
Change in prepaid and accrued income taxes, tax credits and utility revenue taxes	29,429	20,685	39,109
Increase in defined benefit pension and other postretirement benefit plans liability	20,871	882	1,587
Change in other assets and liabilities	15,488	(25,551)	(23,118)
Net cash provided by operating activities	499,312	420,441	495,658
Cash flows from investing activities
Available-for-sale investment securities purchased	(224,335)	(528,379)	(533,956)
Principal repayments on available-for-sale investment securities	218,930	220,231	219,845
Proceeds from sale of available-for-sale investment securities	0	0	16,423
Purchases of held-to-maturity investment securities	(103,184)	(44,515)	0
Proceeds from repayments or maturities of held-to-maturity investment securities	5,720	0	0
Purchase of stock from Federal Home Loan Bank	(28,292)	(2,868)	(7,773)
Redemption of stock from Federal Home Loan Bank	28,040	4,380	7,233
Net decrease (increase) in loans held for investment	(189,352)	15,887	(194,042)
Proceeds from sale of commercial loans	7,149	36,760	52,299
Proceeds from sale of real estate acquired in settlement of loans	589	1,019	829
Proceeds from sale of real estate held for sale	0	0	1,764
Capital expenditures	(537,369)	(495,187)	(330,043)
Contributions in aid of construction	30,599	64,733	30,100
Contributions to low income housing investments	(14,499)	(17,505)	0
Acquisition of business	0	(76,323)	0
Other, net	13,945	6,468	856
Net cash used in investing activities	(792,059)	(815,299)	(736,465)
Cash flows from financing activities
Net increase in deposit liabilities	165,880	341,668	523,675
Net increase (decrease) in short-term borrowings with original maturities of three months or less	(18,999)	67,992	(103,063)
Proceeds from issuance of short-term debt	25,000	125,000	0
Repayment of short-term debt	(50,000)	(75,000)	0
Net increase (decrease) in retail repurchase agreements	26,556	61,776	(43,601)
Proceeds from other bank borrowings	696,000	59,500	180,835
Repayments of other bank borrowings	(701,000)	(123,034)	(272,902)
Proceeds from issuance of long-term debt	250,000	532,325	115,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds	(53,887)	(465,000)	(75,000)
Withheld shares for employee taxes on vested share-based compensation	(996)	(3,828)	(2,416)
Net proceeds from issuance of common stock	0	0	13,220
Common stock dividends	(134,987)	(134,873)	(117,274)
Preferred stock dividends of subsidiaries	(1,890)	(1,890)	(1,890)
Other	(1,603)	(6,349)	2,197
Net cash used in financing activities	200,074	378,287	218,781
Net decrease in cash and equivalents	(92,673)	(16,571)	(22,026)
Cash and cash equivalents, January 1	261,881	278,452	300,478
Cash and cash equivalents, December 31	$ 169,208	$ 261,881	$ 278,452

Consolidated Statements of In_2

Consolidated Statements of Income - HECO - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues									$ 2,614,831		$ 2,380,654
Expenses
Purchased power									639,000	$ 587,000	563,000
Total expenses									2,527,493	2,209,392	2,024,816
Operating income	$ 84,604	$ 98,064	$ 78,799	$ 71,889	$ 87,220	$ 111,473	$ 77,802	$ 69,738	333,356	346,233	355,838
Allowance for equity funds used during construction									10,877	12,483	8,325
Retirement defined benefits expense—other than service costs									(5,962)	(7,942)	(7,663)
Allowance for borrowed funds used during construction									4,867	4,778	3,144
Income before income taxes									254,461	276,580	373,841
Income taxes									50,797	109,393	123,695
Net income (loss)	50,046	66,371	46,527	40,720	32,843	60,544	39,134	34,666	203,664	167,187	250,146
Preferred stock dividends of subsidiaries									1,890	1,890	1,890
Net income for common stock	49,573	65,900	46,054	40,247	32,370	60,073	38,661	34,193	201,774	165,297	248,256
Hawaiian Electric Company, Inc. and Subsidiaries
Revenues									2,546,525	2,257,566	2,094,368
Expenses
Fuel oil									760,528	587,768	454,704
Purchased power									639,307	586,634	562,740
Other operation and maintenance									461,491	411,907	399,931
Depreciation									203,626	192,784	187,061
Taxes, other than income taxes									239,912	214,949	199,862
Total expenses									2,304,864	1,994,042	1,804,298
Operating income	61,112	74,036	55,144	51,369	68,184	88,497	56,482	50,361	241,661	263,524	290,070
Allowance for equity funds used during construction									10,877	12,483	8,325
Retirement defined benefits expense—other than service costs									(3,631)	(6,003)	(5,602)
Interest expense and other charges, net									(73,348)	(69,637)	(66,824)
Allowance for borrowed funds used during construction									4,867	4,778	3,144
Income before income taxes									180,426	205,145	229,113
Income taxes									34,778	83,199	84,801
Net income (loss)	35,796	50,210	31,668	27,974	25,854	47,985	26,143	21,964	145,648	121,946	144,312
Preferred stock dividends of subsidiaries									915	915	915
Net income attributable to Hawaiian Electric									144,733	121,031	143,397
Preferred stock dividends of Hawaiian Electric									1,080	1,080	1,080
Net income for common stock	$ 35,297	$ 49,712	$ 31,169	$ 27,475	$ 25,355	$ 47,487	$ 25,644	$ 21,465	$ 143,653	$ 119,951	$ 142,317

Consolidated Statements of Co_3

Consolidated Statements of Comprehensive Income - HECO - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income for common stock	$ 49,573	$ 65,900	$ 46,054	$ 40,247	$ 32,370	$ 60,073	$ 38,661	$ 34,193	$ 201,774	$ 165,297	$ 248,256
Other comprehensive income (loss), net of taxes:
Effective portion of foreign currency hedge net unrealized losses arising during the period, net of tax benefits of nil, nil and $179 for 2018, 2017 and 2016, respectively									0	0	(281)
Reclassification adjustment to net income, net of (taxes) benefits of nil, $289 and $(110) for 2018, 2017 and 2016, respectively									0	454	(119)
Retirement benefit plans:
Net gains (losses) arising during the period, net of (taxes) benefits of $9,024, $(39,587) and $27,153 for 2018, 2017 and 2016, respectively									(28,101)	65,531	(43,510)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $6,594, $9,221 and $8,442 for 2018, 2017 and 2016, respectively									21,015	15,737	14,518
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively									8,325	(78,724)	28,584
Other comprehensive income (loss), net of taxes									(8,669)	(1,372)	(6,867)
Comprehensive income attributable to Hawaiian Electric Company, Inc.									193,105	163,925	241,389
Hawaiian Electric Company, Inc. and Subsidiaries
Net income for common stock	$ 35,297	$ 49,712	$ 31,169	$ 27,475	$ 25,355	$ 47,487	$ 25,644	$ 21,465	143,653	119,951	142,317
Other comprehensive income (loss), net of taxes:
Effective portion of foreign currency hedge net unrealized losses arising during the period, net of tax benefits of nil, nil and $179 for 2018, 2017 and 2016, respectively									0	0	(281)
Reclassification adjustment to net income, net of (taxes) benefits of nil, $289 and $(110) for 2018, 2017 and 2016, respectively									0	454	(173)
Retirement benefit plans:
Net gains (losses) arising during the period, net of (taxes) benefits of $9,024, $(39,587) and $27,153 for 2018, 2017 and 2016, respectively									(26,019)	63,105	(42,631)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $6,594, $9,221 and $8,442 for 2018, 2017 and 2016, respectively									19,012	14,477	13,254
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively									8,325	(78,724)	28,584
Other comprehensive income (loss), net of taxes									1,318	(688)	(1,247)
Comprehensive income attributable to Hawaiian Electric Company, Inc.									$ 144,971	$ 119,263	$ 141,070

Consolidated Statements of Co_4

Consolidated Statements of Comprehensive Income (Parenthetical) - HECO - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign currency hedge net unrealized loss, (taxes) benefits	$ 0	$ 0	$ 179
Reclassification adjustment to net income, tax (benefits)		(289)	76
Net gains (losses) arising during the period, (taxes) benefits	(9,810)	41,129	(27,703)
Amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits	7,317	10,041	9,267
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, (taxes) benefits	(2,887)	49,523	(18,206)
Hawaiian Electric Company, Inc. and Subsidiaries
Foreign currency hedge net unrealized loss, (taxes) benefits	0	0	179
Reclassification adjustment to net income, tax (benefits)	0	(289)	110
Net gains (losses) arising during the period, (taxes) benefits	(9,024)	39,587	(27,153)
Amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits	6,594	9,221	8,442
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, (taxes) benefits	$ (2,887)	$ 49,523	$ (18,206)

Consolidated Balance Sheets - H

Consolidated Balance Sheets - HECO - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, plant and equipment, net
Total property, plant and equipment, net	$ 4,830,118	$ 4,460,248
Current assets
Total assets	13,104,051	12,534,160
Capitalization and liabilities
Common stock equity	2,162,280	2,097,386
Cumulative preferred stock – not subject to mandatory redemption	0	0
Commitments and contingencies
Current liabilities
Interest and dividends payable	28,254	25,837
Deferred credits and other liabilities
Deferred income taxes	372,518	388,430
Total capitalization and liabilities	13,104,051	12,534,160
Hawaiian Electric Company, Inc. and Subsidiaries
Property, plant and equipment, net
Land	49,667	49,330
Plant and equipment	6,809,671	6,404,887
Less accumulated depreciation	(2,577,342)	(2,476,352)
Construction in progress	233,145	263,094
Utility property, plant and equipment, net	4,515,141	4,240,959
Nonutility property, plant and equipment, less accumulated depreciation of $1,255 and $1,251 as of December 31, 2018 and 2017, respectively	6,961	7,580
Total property, plant and equipment, net	4,522,102	4,248,539
Current assets
Cash and cash equivalents	35,877	12,517
Customer accounts receivable, net	177,896	127,889
Accrued unbilled revenues, net	121,738	107,054
Other accounts receivable, net	6,215	7,163
Fuel oil stock, at average cost	79,935	86,873
Materials and supplies, at average cost	55,204	54,397
Prepayments and other	32,118	25,355
Regulatory assets	71,016	88,390
Total current assets	579,999	509,638
Regulatory assets	762,410	780,907
Other	102,992	91,529
Total other long-term assets	865,402	872,436
Total assets	5,967,503	5,630,613
Capitalization and liabilities
Common stock equity	1,957,641	1,845,283
Cumulative preferred stock – not subject to mandatory redemption	34,293	34,293
Commitments and contingencies
Long-term debt, net	1,418,802	1,318,516
Total capitalization	3,410,736	3,198,092
Current liabilities
Current portion of long-term debt	0	49,963
Short-term borrowings from non-affiliate	25,000	4,999
Accounts payable	171,791	159,610
Interest and dividends payable	23,215	22,575
Taxes accrued, including revenue taxes	233,333	199,101
Regulatory liabilities	17,977	3,401
Other	60,003	59,456
Total current liabilities	531,319	499,105
Deferred credits and other liabilities
Deferred income taxes	383,197	394,041
Regulatory liabilities	932,259	877,369
Unamortized tax credits	91,522	90,369
Defined benefit pension and other postretirement benefit plans liability	503,659	472,948
Other	114,811	98,689
Total deferred credits and other liabilities	2,025,448	1,933,416
Total capitalization and liabilities	$ 5,967,503	$ 5,630,613

Consolidated Balance Sheets -_2

Consolidated Balance Sheets - HECO (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Hawaiian Electric Company, Inc. and Subsidiaries
Accumulated depreciation on other property, plant and equipment	$ 1,255	$ 1,251

Consolidated Statements of Capi

Consolidated Statements of Capitalization - HECO - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Common stock equity
Retained earnings	$ 543,623,000	$ 476,836,000
Accumulated other comprehensive income (loss), net of taxes-retirement benefit plans	(25,751,000)	(26,990,000)
Total shareholders’ equity	2,162,280,000	2,097,386,000
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293,000	34,293,000
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	462,000,000	462,000,000
3.10%, Refunding series 2017A, due 2026
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	125,000,000	125,000,000
4.00%, Refunding series 2017B, due 2037
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	140,000,000	140,000,000
3.25%, Refunding series 2015, due 2025
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	47,000,000	47,000,000
6.50%, Series 2009, due 2039
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	150,000,000	150,000,000
Hawaiian Electric Company, Inc. and Subsidiaries
Common stock equity
Common stock of $6 2/3 par value, Authorized: 50,000,000 shares. Outstanding: 16,142,216 shares and 16,019,785 shares at December 31, 2017 and 2016, respectively	111,696,000	107,634,000
Premium on capital stock	681,305,000	614,675,000
Retained earnings	1,164,541,000	1,124,193,000
Accumulated other comprehensive income (loss), net of taxes-retirement benefit plans	99,000	(1,219,000)
Total shareholders’ equity	$ 1,957,641,000	1,845,283,000
Shares outstanding December 31, 2018 and 2017	1,234,657
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 34,293,000	34,293,000
Other long-term debt – unsecured:
Other long-term debt - unsecured	964,546,000	914,546,000
Total long-term debt	1,426,546,000	1,376,546,000
Less unamortized debt issuance costs	7,744,000	8,067,000
Less current portion long-term debt, net of unamortized debt issuance costs	0	49,963,000
Long-term debt, net	1,418,802,000	1,318,516,000
Total capitalization	3,410,736,000	3,198,092,000
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes
Other long-term debt – unsecured:
Other long-term debt - unsecured	913,000,000	863,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | 4.38%, Series 2018A, due 2028
Other long-term debt – unsecured:
Other long-term debt - unsecured	67,500,000	0
Hawaiian Electric Company, Inc. and Subsidiaries | 4.53%, Series 2018B, due 2033
Other long-term debt – unsecured:
Other long-term debt - unsecured	17,500,000	0
Hawaiian Electric Company, Inc. and Subsidiaries | 4.72%, Series 2018C, due 2048
Other long-term debt – unsecured:
Other long-term debt - unsecured	15,000,000	0
Hawaiian Electric Company, Inc. and Subsidiaries | 4.31%, Series 2017A, due 2047
Other long-term debt – unsecured:
Other long-term debt - unsecured	50,000,000	50,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | 5.23%, Series 2015A, due 2045
Other long-term debt – unsecured:
Other long-term debt - unsecured	80,000,000	80,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | 4.45%, Series 2013A and 2013B, due 2022
Other long-term debt – unsecured:
Other long-term debt - unsecured	52,000,000	52,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | 4.84%, Series 2013A, 2013B and 2013C, due 2027
Other long-term debt – unsecured:
Other long-term debt - unsecured	100,000,000	100,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | 5.65%, Series 2013B and 2013C, due 2043
Other long-term debt – unsecured:
Other long-term debt - unsecured	70,000,000	70,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | 3.79%, Series 2012A, paid in 2018
Other long-term debt – unsecured:
Other long-term debt - unsecured	0	50,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | 4.03%, Series 2012B, due 2020
Other long-term debt – unsecured:
Other long-term debt - unsecured	82,000,000	82,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | 4.55%, Series 2012B and 2012C, due 2023
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 100,000,000	$ 100,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series C, 4.25% Preferred Stock
Common stock equity
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding December 31, 2018 and 2017	150,000	150,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 3,000,000	$ 3,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series D, 5.00% Preferred Stock
Common stock equity
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding December 31, 2018 and 2017	50,000	50,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 1,000,000	$ 1,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series E, 5.00% Preferred Stock
Common stock equity
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding December 31, 2018 and 2017	150,000	150,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 3,000,000	$ 3,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series H, 5.25% Preferred Stock
Common stock equity
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding December 31, 2018 and 2017	250,000	250,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 5,000,000	$ 5,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series I, 5.00% Preferred Stock
Common stock equity
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding December 31, 2018 and 2017	89,657	89,657
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 1,793,000	$ 1,793,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series J, 4.75% Preferred Stock
Common stock equity
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding December 31, 2018 and 2017	250,000	250,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 5,000,000	$ 5,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series K, 4.65% Preferred Stock
Common stock equity
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding December 31, 2018 and 2017	175,000	175,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 3,500,000	$ 3,500,000
Hawaii Electric Light Company, Inc. (HELCO)
Common stock equity
Total shareholders’ equity	295,874,000	286,647,000
Other long-term debt – unsecured:
Less current portion long-term debt, net of unamortized debt issuance costs		10,992,000
Long-term debt, net	217,749,000	202,701,000
Total capitalization	520,623,000	496,348,000
Hawaii Electric Light Company, Inc. (HELCO) | 3.83%, Series 2013A, due 2020
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 14,000,000	$ 14,000,000
Hawaii Electric Light Company, Inc. (HELCO) | Series G, 7.625% Preferred Stock
Common stock equity
Preferred stock, par value (in dollars per share)	$ 100
Shares outstanding December 31, 2018 and 2017	70,000	70,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 7,000,000	$ 7,000,000
Maui Electric Company, Limited (MECO)
Common stock equity
Total shareholders’ equity	280,863,000	270,265,000
Other long-term debt – unsecured:
Less current portion long-term debt, net of unamortized debt issuance costs		8,993,000
Long-term debt, net	200,916,000	190,836,000
Total capitalization	$ 486,779,000	$ 466,101,000
Maui Electric Company, Limited (MECO) | Series H, 7.625% Preferred Stock
Common stock equity
Preferred stock, par value (in dollars per share)	$ 100
Shares outstanding December 31, 2018 and 2017	50,000	50,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 5,000,000	$ 5,000,000
Hawaiian Electric
Common stock equity
Total shareholders’ equity	1,957,641,000	1,845,283,000
Other long-term debt – unsecured:
Less current portion long-term debt, net of unamortized debt issuance costs		29,978,000
Long-term debt, net	1,000,137,000	924,979,000
Total capitalization	2,980,071,000	2,792,555,000
Hawaiian Electric | 4.54%, Series 2016A, due 2046
Other long-term debt – unsecured:
Other long-term debt - unsecured	40,000,000	40,000,000
Hawaiian Electric | 4.72%, Series 2012D, due 2029
Other long-term debt – unsecured:
Other long-term debt - unsecured	35,000,000	35,000,000
Hawaiian Electric | 5.39%, Series 2012E, due 2042
Other long-term debt – unsecured:
Other long-term debt - unsecured	150,000,000	150,000,000
Hawaiian Electric | 4.53%, Series 2012F, due 2032
Other long-term debt – unsecured:
Other long-term debt - unsecured	40,000,000	40,000,000
Hawaiian Electric | 6.50 %, series 2004, Junior subordinated deferrable interest debentures, due 2034
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 51,546,000	$ 51,546,000

Consolidated Statements of Ca_2

Consolidated Statements of Capitalization - HECO (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Common stock, authorized shares	200,000,000	200,000,000
Common stock, outstanding shares	108,879,245	108,787,807
3.10% Refunding Series 2017A Due 2026
Debt instrument, stated interest rate	3.10%
4.00% Refunding Series 2017B, Due 2037
Debt instrument, stated interest rate	4.00%
3.25% Refunding Series 2015 SPRBs due 2025
Debt instrument, stated interest rate	3.25%
6.50%, series 2009, due 2039
Debt instrument, stated interest rate	6.50%
4.38%, Series 2018A, due 2028
Debt instrument, stated interest rate	4.38%
4.53%, Series 2018B, due 2033
Debt instrument, stated interest rate	4.53%
4.72%, Series 2018C, due 2048
Debt instrument, stated interest rate	4.72%
4.31%, Series 2017A, due 2047
Debt instrument, stated interest rate	4.31%
4.54%, Series 2016A, due 2046
Debt instrument, stated interest rate	4.54%
5.23%, Series 2015A, due 2045
Debt instrument, stated interest rate	5.23%
3.83%, Series 2013A, due 2020
Debt instrument, stated interest rate	3.83%
4.45%, Series 2013A and 2013B, due 2022
Debt instrument, stated interest rate	4.45%
4.84%, Series 2013A, 2013B and 2013C, due 2027
Debt instrument, stated interest rate	4.84%
5.65%, Series 2013B and 2013C, due 2043
Debt instrument, stated interest rate	5.65%
3.79%, Series 2012A, paid in 2018
Debt instrument, stated interest rate	3.79%
4.03%, Series 2012B, due 2020
Debt instrument, stated interest rate	4.03%
4.55%, Series 2012B and 2012C, due 2023
Debt instrument, stated interest rate	4.55%
4.72%, Series 2012D, due 2029
Debt instrument, stated interest rate	4.72%
5.39%, Series 2012E, due 2042
Debt instrument, stated interest rate	5.39%
4.53%, Series 2012F, due 2032
Debt instrument, stated interest rate	4.53%
6.50 %, series 2004, Junior subordinated deferrable interest debentures, due 2034
Debt instrument, stated interest rate	6.50%
Hawaiian Electric Company, Inc. and Subsidiaries
Common stock, par value (in dollars per share)	$ 6.667	$ 6.667
Common stock, authorized shares	50,000,000	50,000,000
Common stock, outstanding shares	16,142,216	16,142,216
Shares outstanding	1,234,657
Hawaiian Electric Company, Inc. and Subsidiaries | Preferred Stock $20 Par Value
Preferred stock, par value (in dollars per share)	$ 20	$ 20
Preferred stock, Authorized shares	5,000,000	5,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Preferred Stock $100 Par Value
Preferred stock, par value (in dollars per share)	$ 100	$ 100
Preferred stock, Authorized shares	7,000,000	7,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series C, 4.25% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	150,000	150,000
Preferred stock, stated dividend rate	4.25%
Hawaiian Electric Company, Inc. and Subsidiaries | Series D, 5.00% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	50,000	50,000
Preferred stock, stated dividend rate	5.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Series E, 5.00% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	150,000	150,000
Preferred stock, stated dividend rate	5.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Series H, 5.25% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	250,000	250,000
Preferred stock, stated dividend rate	5.25%
Hawaiian Electric Company, Inc. and Subsidiaries | Series I, 5.00% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	89,657	89,657
Preferred stock, stated dividend rate	5.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Series J, 4.75% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	250,000	250,000
Preferred stock, stated dividend rate	4.75%
Hawaiian Electric Company, Inc. and Subsidiaries | Series K, 4.65% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	175,000	175,000
Preferred stock, stated dividend rate	4.65%
Hawaii Electric Light Company, Inc. (HELCO) | Series G, 7.625% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 100
Shares outstanding	70,000	70,000
Preferred stock, stated dividend rate	7.625%
Maui Electric Company, Limited (MECO) | Series H, 7.625% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 100
Shares outstanding	50,000	50,000
Preferred stock, stated dividend rate	7.625%

Consolidated Statements of Ch_3

Consolidated Statements of Changes in Common Stock Equity - HECO - USD ($) $ in Thousands	Total	Retained earnings	Accumulated other comprehensive income (loss)	Hawaiian Electric Company, Inc. and Subsidiaries	Hawaiian Electric Company, Inc. and SubsidiariesCommon stock	Hawaiian Electric Company, Inc. and SubsidiariesPremium on capital stock	Hawaiian Electric Company, Inc. and SubsidiariesRetained earnings	Hawaiian Electric Company, Inc. and SubsidiariesAccumulated other comprehensive income (loss)
Beginning Balance at Dec. 31, 2015	$ 1,927,640	$ 324,766	$ (26,262)	$ 1,728,325	$ 105,388	$ 578,930	$ 1,043,082	$ 925
Balance (in shares) at Dec. 31, 2015					15,805,000
Increase (decrease) in stockholders' equity
Net income for common stock	248,256	248,256		142,317			142,317
Other comprehensive income (loss), net of tax benefits	(6,867)		(6,867)	(1,247)				(1,247)
Issuance of common stock, net of expenses				23,991	$ 1,430	22,561
Issuance of common stock, net of expenses (in shares)					215,000
Common stock dividends	(134,050)	(134,050)		(93,599)			(93,599)
Ending Balance at Dec. 31, 2016	2,066,753	438,972	(33,129)	1,799,787	$ 106,818	601,491	1,091,800	(322)
Balance (in shares) at Dec. 31, 2016					16,020,000
Increase (decrease) in stockholders' equity
Net income for common stock	165,297	165,297		119,951			119,951
Other comprehensive income (loss), net of tax benefits	(1,372)		(1,372)	(688)				(688)
Reclass of AOCI for tax rate reduction impact	0	7,440	(7,440)				209	(209)
Issuance of common stock, net of expenses				14,000	$ 816	13,184
Issuance of common stock, net of expenses (in shares)					122,000
Common stock dividends	(134,873)	(134,873)		(87,767)			(87,767)
Ending Balance at Dec. 31, 2017	$ 2,097,386	476,836	(41,941)	1,845,283	$ 107,634	614,675	1,124,193	(1,219)
Balance (in shares) at Dec. 31, 2017	108,787,807				16,142,000
Increase (decrease) in stockholders' equity
Net income for common stock	$ 201,774	201,774		143,653			143,653
Other comprehensive income (loss), net of tax benefits	(8,669)		(8,669)	1,318				1,318
Issuance of common stock, net of expenses				70,692	$ 4,062	66,630
Issuance of common stock, net of expenses (in shares)					609,000
Common stock dividends	(134,987)	(134,987)		(103,305)			(103,305)
Ending Balance at Dec. 31, 2018	$ 2,162,280	$ 543,623	$ (50,610)	$ 1,957,641	$ 111,696	$ 681,305	$ 1,164,541	$ 99
Balance (in shares) at Dec. 31, 2018	108,879,245				16,751,000

Consolidated Statements of Ca_3

Consolidated Statements of Cash Flows - HECO - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 203,664	$ 167,187	$ 250,146
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	214,036	200,658	194,273
Other amortization	41,593	21,340	10,473
Deferred income taxes	(9,368)	37,835	47,118
Allowance for equity funds used during construction	(10,877)	(12,483)	(8,325)
Other	(4,219)	(3,324)	(12,422)
Changes in assets and liabilities
Decrease (increase) in fuel oil stock	7,054	(20,794)	4,786
Decrease (increase) in regulatory assets	9,252	(17,256)	(18,273)
Change in prepaid and accrued income taxes, tax credits and revenue taxes	29,429	20,685	39,109
Increase in defined benefit pension and other postretirement benefit plans liability	20,871	882	1,587
Change in other assets and liabilities	15,488	(25,551)	(23,118)
Net cash provided by operating activities	499,312	420,441	495,658
Cash flows from investing activities
Capital expenditures	(537,369)	(495,187)	(330,043)
Contributions in aid of construction	30,599	64,733	30,100
Other, net	13,945	6,468	856
Net cash used in investing activities	(792,059)	(815,299)	(736,465)
Cash flows from financing activities
Common stock dividends	(134,987)	(134,873)	(117,274)
Proceeds from issuance of common stock	0	0	13,220
Proceeds from issuance of long-term debt	250,000	532,325	115,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds	(53,887)	(465,000)	(75,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	(18,999)	67,992	(103,063)
Other	(1,603)	(6,349)	2,197
Net cash used in financing activities	200,074	378,287	218,781
Net decrease in cash and equivalents	(92,673)	(16,571)	(22,026)
Hawaiian Electric Company, Inc. and Subsidiaries
Cash flows from operating activities
Net income	145,648	121,946	144,312
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	203,626	192,784	187,061
Other amortization	26,602	8,498	6,935
Deferred income taxes	(7,982)	38,037	74,386
Allowance for equity funds used during construction	(10,877)	(12,483)	(8,325)
Other	(1,570)	(1,066)	(3,700)
Changes in assets and liabilities
Decrease (increase) in accounts receivable	(50,917)	2,914	8,551
Increase in accrued unbilled revenues	(14,684)	(15,361)	(7,184)
Decrease (increase) in fuel oil stock	6,938	(20,443)	4,786
Decrease (increase) in materials and supplies	(807)	(718)	750
Decrease (increase) in regulatory assets	9,252	(17,256)	(18,273)
Increase (decrease) in accounts payable	24,358	25,734	(10,614)
Change in prepaid and accrued income taxes, tax credits and revenue taxes	25,036	29,862	2,123
Increase in defined benefit pension and other postretirement benefit plans liability	18,746	604	484
Change in other assets and liabilities	20,244	(17,866)	(11,375)
Net cash provided by operating activities	393,613	335,186	369,917
Cash flows from investing activities
Capital expenditures	(445,863)	(441,598)	(320,437)
Contributions in aid of construction	30,599	64,733	30,100
Other, net	10,082	4,578	2,138
Net cash used in investing activities	(405,182)	(372,287)	(288,199)
Cash flows from financing activities
Common stock dividends	(103,305)	(87,767)	(93,599)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(1,995)	(1,995)	(1,995)
Proceeds from issuance of common stock	70,700	14,000	24,000
Proceeds from issuance of long-term debt	100,000	315,000	40,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds	(50,000)	(265,000)	0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	(4,999)	4,999	0
Proceeds from other borrowings	25,000	0	0
Other	(472)	(3,905)	(287)
Net cash used in financing activities	34,929	(24,668)	(31,881)
Net decrease in cash and equivalents	23,360	(61,769)	49,837
Cash and cash equivalents, beginning of period	12,517	74,286	24,449
Cash and cash equivalents, end of period	$ 35,877	$ 12,517	$ 74,286

Summary of significant accounti

Summary of significant accounting policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of significant accounting policies	Note 1 · Summary of significant accounting policies General Hawaiian Electric Industries, Inc. (HEI) is a holding company with direct and indirect subsidiaries principally engaged in electric utility, banking, and renewable/sustainable infrastructure investment businesses operating in the State of Hawaii . HEI owns Hawaiian Electric Company, Inc. (Hawaiian Electric), ASB Hawaii, Inc., an intermediate holding company, that owns American Savings Bank, F.S.B. (ASB), and Pacific Current, LLC (Pacific Current), which indirectly owns Hamakua Energy, LLC (Hamakua Energy) and Mauo, LLC (Mauo). Hawaiian Electric and its wholly owned operating subsidiaries, Hawaii Electric Light Company, Inc. (Hawaii Electric Light) and Maui Electric Company, Limited (Maui Electric), are regulated public electric utilities (collectively, the Utilities) in the business of generating, purchasing, transmitting, distributing and selling electric energy on all major islands in Hawaii other than Kauai. See Note 2 . ASB is a federally chartered savings bank providing a full range of banking services to individual and business customers through its branch system in Hawaii. Hamakua Energy, owns and operates a 60 -megawatt (MW) combined-cycle power plant, which sells the power it produces only to Hawaii Electric Light. Mauo is a commercial-scale, solar-plus-storage project ( 8.6 MW of solar and 42.3 MW of storage) currently under construction on the islands of Oahu and Maui. Basis of presentation. In preparing the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (GAAP), management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant change for HEI and its subsidiaries (collectively, the Company) include the amounts reported for investment securities (ASB only); property, plant and equipment; pension and other postretirement benefit obligations; contingencies and litigation; income taxes; regulatory assets and liabilities (Utilities only); electric utility unbilled revenues (Utilities only); and allowance for loan losses (ASB only). Consolidation. The HEI consolidated financial statements include the accounts of HEI and its subsidiaries. The Hawaiian Electric consolidated financial statements include the accounts of Hawaiian Electric and its subsidiaries, except for HECO Capital Trust III (Trust III), which is accounted for under the equity method because Hawaiian Electric does not have a controlling financial interest or variable interest in Trust III, but has the ability to exercise significant influence. When HEI or Hawaiian Electric has a controlling financial interest in another entity (usually, majority voting interest), that entity is consolidated. Investments in companies over which the Company or the Utilities have the ability to exercise significant influence, but not control, are accounted for using the equity method. The consolidated financial statements exclude variable interest entities (VIEs) when the Company or the Utilities are not the primary beneficiaries. See Note 3 for information regarding Trust III unconsolidated VIEs. In general, intercompany amounts are eliminated in consolidation (see Note 2 for exceptions). Cash and cash equivalents. The Utilities consider cash on hand, deposits in banks, money market accounts, certificates of deposit, short-term commercial paper of non-affiliates and liquid investments (with original maturities of three months or less) to be cash and cash equivalents. The Company considers the same items to be cash and cash equivalents as well as ASB’s deposits with the Federal Home Loan Bank (FHLB), federal funds sold (excess funds that ASB loans to other banks overnight at the federal funds rate) and securities purchased under resale agreements. Additionally, ASB is required by the Federal Reserve System to maintain noninterest-bearing cash reserves equal to a percentage of deposits. The reserve requirement for ASB at December 31, 2018 and 2017 was $28.1 million and $17.9 million , respectively. Property, plant and equipment. Property, plant and equipment are reported at cost. Self-constructed electric utility plant includes engineering, supervision, administrative and general costs and an allowance for the cost of funds used during the construction period. These costs are recorded in construction in progress and are transferred to utility plant when construction is completed and the facilities are either placed in service or become useful for public utility purposes. Costs for betterments that make utility plant more useful, more efficient, of greater durability or of greater capacity are also capitalized. Upon the retirement or sale of electric utility plant, generally no gain or loss is recognized. The cost of the plant retired is charged to accumulated depreciation. Amounts collected from customers for cost of removal are included in regulatory liabilities. See discussion regarding “Utility projects” in Note 3 . Depreciation. Depreciation is computed primarily using the straight-line method over the estimated lives of the assets being depreciated. Electric utility plant additions in the current year are depreciated beginning January 1 of the following year in accordance with rate-making. Electric utility plant has lives ranging from 16 to 88 years for production plant, from 10 to 79 years for transmission and distribution plant and from 5 to 65 years for general plant. The Utilities’ composite annual depreciation rate, which includes a component for cost of removal, was 3.2% in 2018 , 2017 and 2016 . Leases. HEI, the Utilities and ASB have entered into lease agreements for the use of equipment and office space. The provisions of some of the lease agreements contain renewal options. HEI’s consolidated operating lease expense was $21 million , $20 million and $19 million in 2018 , 2017 and 2016 , respectively. The Utilities’ operating lease expense was $11 million , $11 million and $10 million in 2018 , 2017 and 2016 , respectively. HEI’s consolidated and the Utilities’ future minimum lease payments are as follows: (in millions) HEI Hawaiian Electric 2019 $ 11 $ 6 2020 9 6 2021 8 5 2022 5 2 2023 4 2 Thereafter 12 3 $ 49 $ 24 Retirement benefits. Pension and other postretirement benefit costs are charged primarily to expense and electric utility plant (in the case of the Utilities). Funding for the Company’s qualified pension plans (Plans) is based on actuarial assumptions adopted by the Pension Investment Committee administering the Plans. The participating employers contribute amounts to a master pension trust for the Plans in accordance with the funding requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA), including changes promulgated by the Pension Protection Act of 2006, and considering the deductibility of contributions under the Internal Revenue Code. The Company generally funds at least the net periodic pension cost during the year, subject to limits and targeted funded status. Under a pension tracking mechanism approved by the Public Utilities Commission of the State of Hawaii (PUC), the Utilities generally will make contributions to the pension fund at the greater of the minimum level required under the law or net periodic pension cost. Certain health care and/or life insurance benefits are provided to eligible retired employees and the employees’ beneficiaries and covered dependents. The Company generally funds the net periodic postretirement benefit costs other than pensions (except for executive life) for postretirement benefits other than pensions (OPEB), while maximizing the use of the most tax-advantaged funding vehicles, subject to cash flow requirements and reviews of the funded status with the consulting actuary. The Utilities must fund OPEB costs as specified in the OPEB tracking mechanisms, which were approved by the PUC. Future decisions in rate cases could further impact funding amounts. Environmental expenditures. The Company and the Utilities are subject to numerous federal and state environmental statutes and regulations. In general, environmental contamination treatment costs are charged to expense. Environmental costs are capitalized if the costs extend the life, increase the capacity, or improve the safety or efficiency of property; the costs mitigate or prevent future environmental contamination; or the costs are incurred in preparing the property for sale. Environmental costs are either capitalized or charged to expense when environmental assessments and/or remedial efforts are probable and the cost can be reasonably estimated. The Utilities review their sites and measure the liability quarterly by assessing a range of reasonably likely costs of each identified site using currently available information, including existing technology, presently enacted laws and regulations, experience gained at similar sites, and the probable level of involvement and financial condition of other potentially responsible parties. Income taxes. Deferred income tax assets and liabilities are established for the temporary differences between the financial reporting bases and the tax bases of the Company’s and the Utilities’ assets and liabilities at federal and state tax rates expected to be in effect when such deferred tax assets or liabilities are realized or settled. As a result of the 2017 Tax Cuts and Jobs Act (Tax Act), the accumulated deferred income tax balances (ADIT) were adjusted in 2017 for the lower federal income tax rate expected to be in effect when the deferred tax assets or liabilities are realized or settled. See further discussion under “Recent tax developments” in Note 11 . The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount expected to be realized. HEI and the Utilities’ investment tax credits are deferred and amortized over the estimated useful lives of the properties to which the credits relate (and for the Utilities, this treatment is in accordance with Accounting Standards Codification (ASC) Topic 980, “Regulated Operations”). The Utilities are included in the consolidated income tax returns of HEI. However, income tax expense has been computed for financial statement purposes as if each utility filed a separate income tax return and Hawaiian Electric filed a consolidated Hawaiian Electric income tax return. Governmental tax authorities could challenge a tax return position taken by the Company. The Company and the Utilities use a “more-likely-than-not” recognition threshold and measurement standard for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Fair value measurements. Fair value estimates are estimates of the price that would be received to sell an asset, or paid upon the transfer of a liability, in an orderly transaction between market participants at the measurement date. The fair value estimates are generally determined based on assumptions that market participants would use in pricing the asset or liability and are based on market data obtained from independent sources. However, in certain cases, the Company and the Utilities use their own assumptions about market participant assumptions based on the best information available in the circumstances. These valuations are estimates at a specific point in time, based on relevant market information, information about the financial instrument and judgments regarding future expected loss experience, economic conditions, risk characteristics of various financial instruments and other factors. These estimates do not reflect any premium or discount that could result if the Company or the Utilities were to sell its entire holdings of a particular financial instrument at one time. Because no active trading market exists for a portion of the Company’s and the Utilities’ financial instruments, fair value estimates cannot be determined with precision. Changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the estimates. In addition, the tax ramifications related to the realization of the unrealized gains and losses could have a significant effect on fair value estimates, but have not been considered in making such estimates. The Company and the Utilities group their financial assets measured at fair value in three levels outlined as follows: Level 1: Inputs to the valuation methodology are quoted prices, unadjusted, for identical assets or liabilities in active markets. A quoted price in an active market provides the most reliable evidence of fair value and is used to measure fair value whenever available. Level 2: Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets; inputs to the valuation methodology include quoted prices for identical or similar assets or liabilities in markets that are not active; or inputs to the valuation methodology that are derived principally from or can be corroborated by observable market data by correlation or other means. Level 3: Inputs to the valuation methodology are unobservable and significant to the fair value measurement. Level 3 assets and liabilities include financial instruments whose value is determined using discounted cash flow methodologies, as well as instruments for which the determination of fair value requires significant management judgment or estimation. Classification in the hierarchy is based upon the lowest level input that is significant to the fair value measurement of the asset or liability. For instruments classified in Level 1 and 2 where inputs are primarily based upon observable market data, there is less judgment applied in arriving at the fair value. For instruments classified in Level 3, management judgment is more significant due to the lack of observable market data. Fair value is also used on a nonrecurring basis to evaluate certain assets for impairment or for disclosure purposes. Examples of nonrecurring uses of fair value include mortgage servicing rights accounted for by the amortization method, loan impairments for certain loans, real estate acquired in settlement of loans, goodwill and asset retirement obligations (AROs). Earnings per share (HEI only). Basic earnings per share (EPS) is computed by dividing net income for common stock by the weighted-average number of common shares outstanding for the period. Diluted EPS is computed similarly, except that dilutive common shares for stock compensation and the equity forward transactions are added to the denominator. Impairment of long-lived assets and long-lived assets to be disposed of. The Company and the Utilities review long-lived assets and certain identifiable intangibles for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less costs to sell. Recent accounting pronouncements. Revenues from contracts with customers . In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606).” The core principle of the guidance in ASU No. 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU No. 2014-09 also requires disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The Company and Hawaiian Electric adopted ASU No. 2014-09 (and subsequently issued revenue-related ASUs, as applicable) in the first quarter of 2018. There was no cumulative effect adjustment and no impact on the timing or pattern of revenue recognition, but ASU No. 2014-09 required changes with respect to the Company’s and Hawaiian Electric’s revenue disclosures. See Note 8 . Financial instruments . In January 2016, the FASB issued ASU No. 2016-01, “Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities,” which, among other things: • Requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. • Requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. • Requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables). • Eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost. The Company adopted ASU No. 2016-01 in the first quarter of 2018 and the impact of adoption was not material to the Company’s and Hawaiian Electric’s consolidated financial statements. Cash flows . In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments,” which provides guidance on eight specific cash flow issues - debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies), distributions received from equity method investees, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. The Company adopted ASU No. 2016-15 in the first quarter of 2018 using a retrospective transition method and there was no impact from the adoption to the Company’s and Hawaiian Electric’s consolidated statements of cash flows. Restricted cash . In November 2016, the FASB issued ASU No. 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash,” which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The Company adopted ASU No. 2016-18 in the first quarter of 2018 using a retrospective transition method and the impact of adoption was not material to the Company’s and Hawaiian Electric’s consolidated statements of cash flows. Definition of a Business . In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations-Clarifying the Definition of a Business.” This update clarifies the definition of a business and adds guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted ASU No. 2017-01 in the first quarter of 2018 and the impact of adoption was not material to the Company’s and Hawaiian Electric’s consolidated financial statements. Net periodic pension cost and net periodic postretirement benefit cost . In March 2017, the FASB issued ASU No. 2017-07, “Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” which requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. It also requires the other components of net periodic pension cost (NPPC) and net periodic postretirement benefit cost (NPBC) as defined in paragraphs 715-30-35-4 and 715-60-35-9 to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. Additionally, only the service cost component is eligible for capitalization under GAAP, when applicable. The Company adopted ASU No. 2017-07 in the first quarter of 2018: (1) retrospectively for the presentation in the income statement of the service cost component and the other components of NPPC and NPBC, and (2) prospectively for the capitalization in assets of the service cost component of NPPC and NPBC for Hawaiian Electric and its subsidiaries. HEI and ASB do not capitalize pension and OPEB costs. The Company and Hawaiian Electric elected the practical expedient that permits an entity to use the amounts disclosed in its pension and other postretirement benefit plan note for the prior comparative periods as the estimation basis for applying the retrospective presentation requirements. The PUC approved in the Utilities’ rate cases, stipulated agreements to defer non-service cost components of NPPC and NPBC, which would have been capitalized prior to ASU No. 2017-07, as part of each utility’s pension tracking mechanisms. Such treatment is effective starting in 2018 and continues until each utility’s next rate case. In each utility’s next rate case, rates established would include recovery of the deferred non-service cost components and the Utilities’ will seek approval to capitalize only the service components of NPPC and NPBC going forward, which reflects the requirements of ASU No.2017-07. The adoption of ASU 2017-07 in the first quarter of 2018 did not have an impact on 2018 net income. The following table summarizes the impact to the prior period financial statements of the adoption of ASU No. 2017-07: 2017 2016 (in thousands) As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported HEI Consolidated Statements of Income Expenses Electric utility $ 2,000,045 $ (6,003 ) $ 1,994,042 $ 1,809,900 $ (5,602 ) $ 1,804,298 Bank 198,924 (820 ) 198,104 198,572 (875 ) 197,697 Other 18,365 (1,119 ) 17,246 24,007 (1,186 ) 22,821 Total expenses $ 2,217,334 $ (7,942 ) $ 2,209,392 $ 2,032,479 $ (7,663 ) $ 2,024,816 Operating income Electric utility $ 257,521 $ 6,003 $ 263,524 $ 284,468 $ 5,602 $ 290,070 Bank 98,716 820 99,536 87,352 875 88,227 Other (17,946 ) 1,119 (16,827 ) (23,645 ) 1,186 (22,459 ) Total operating income $ 338,291 $ 7,942 $ 346,233 $ 348,175 $ 7,663 $ 355,838 Retirement defined benefits expense--other than service costs $ — $ (7,942 ) $ (7,942 ) $ — $ (7,663 ) $ (7,663 ) Hawaiian Electric Consolidated Statements of Income Other operation and maintenance $ 417,910 $ (6,003 ) $ 411,907 $ 405,533 $ (5,602 ) $ 399,931 Total expense 2,000,045 (6,003 ) 1,994,042 1,809,900 (5,602 ) 1,804,298 Operating income 257,521 6,003 263,524 284,468 5,602 290,070 Retirement defined benefits expense--other than service costs — (6,003 ) (6,003 ) — (5,602 ) (5,602 ) Hawaiian Electric Consolidating Statements of Income (in Note 3) Hawaiian Electric (parent only) Other operation and maintenance 279,440 (5,049 ) 274,391 273,176 (5,058 ) 268,118 Total expense 1,425,655 (5,049 ) 1,420,606 1,277,245 (5,058 ) 1,272,187 Operating income 172,849 5,049 177,898 197,139 5,058 202,197 Retirement defined benefits expense--other than service costs — (5,049 ) (5,049 ) — (5,058 ) (5,058 ) 2017 2016 (in thousands) As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported Hawaiian Electric Consolidating Statements of Income (in Note 3) Hawaii Electric Light Other operation and maintenance $ 66,277 $ (93 ) $ 66,184 $ 63,897 $ 319 $ 64,216 Total expense 287,868 (93 ) 287,775 266,823 319 267,142 Operating income 45,599 93 45,692 44,562 (319 ) 44,243 Retirement defined benefits expense--other than service costs — (93 ) (93 ) — 319 319 Maui Electric Other operation and maintenance 72,193 (861 ) 71,332 68,460 (863 ) 67,597 Total expense 286,522 (861 ) 285,661 265,832 (863 ) 264,969 Operating income 39,156 861 40,017 42,873 863 43,736 Retirement defined benefits expense--other than service costs — (861 ) (861 ) — (863 ) (863 ) ASB Statements of Income Data (in Note 4) Compensation and employee benefits 95,751 (820 ) 94,931 90,117 (875 ) 89,242 Other expense 19,324 820 20,144 18,487 875 19,362 Derivatives and Hedging. In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” which is intended to improve and simplify accounting rules around hedge accounting. The amendments in ASU No. 2017-12 improve the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results in the financial statements. The amendments also expand and refine hedge accounting for both nonfinancial and financial risk components and align the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. For public business entities, the new guidance is effective for annual periods beginning after December 15, 2018, including interim periods within those annual periods, but early adoption is permitted. The Company early adopted ASU No. 2017-12 in the second quarter of 2018, with an effective date of April 1, 2018, and the adoption did not have a material impact on the Company’s consolidated financial statements. Leases . In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842),” which requires that lessees recognize a liability to make lease payments (the lease liability) and a right-of-use (ROU) asset, representing its right to use the underlying asset for the lease term, for all leases (except short-term leases) at the commencement date. For finance leases, a lessee is required to recognize interest on the lease liability separately from amortization of the ROU asset in the consolidated statements of income. For operating leases, a lessee is required to recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis. The Company adopted ASU No. 2016-02 on January 1, 2019 and used the effective date as the date of initial application. Consequently, financial information for dates and periods before January 1, 2019 will not be updated and the disclosures required under the new standard will not be provided (i.e., the Company will continue to report comparative periods presented in the financial statements in the period of adoption under ASC 840, including the required disclosures under ASC 840). The new standard provides a number of optional practical expedients in transition. The Company has elected the practical expedient package under which the Company will not have to reassess its prior conclusions about whether any expired or existing contracts are or contain leases, whether there is a change in lease classification for any expired or existing leases under the new standard, or whether there were initial direct costs for any existing leases that would be treated differently under the new standard. The most significant effect of the new standard relates to the recognition of new ROU assets and lease liabilities on the Company’s balance sheet for purchase power agreements and real estate operating leases. On adoption, the Company recognized additional lease liabilities of approximately $257 million for the Company and approximately $236 million for the Utilities ( $215 million related to PPAs), with corresponding ROU assets of the same amount based on the present value of the remaining minimum rental payments under current leasing standards for existing operating leases. The new standard also provides practical expedients for an entity’s ongoing accounting. The Company has elected the short-term lease recognition exemption for all of its leases that qualify, which means the Company will not recognize lease liabilities and ROU assets for all leases that have lease terms that are 12 months or less. The Company has elected the practical expedient to not separate lease and non-lease components for its real estate leases. The Utilities also elected the practical expedient to not assess all existing land easements that were not previously accounted for in accordance with ASC 840. Credit losses . In June 2016, the FASB issued ASU No. 2016-13, “ Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ,” which is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations . ASU No. 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date (based on historical experience, current conditions and reasonable and supportable forecasts) and enhanced disclosures to help financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. In addition, ASU No. 2016-13 amends the accounting for credit losses on available-for-sale (AFS) debt securities and purchased financial assets with credit deterioration. The other-than-temporary impairment model of accounting for credit losses on AFS debt securities will be replaced with an estimate of expected credit losses only when the fair value is below the amortized cost of the asset. The length of time the fair value of an AFS debt security has been below the amortized cost will no longer impact the determination of whether a credit loss exists. The AFS debt security model will also require the use of an allowance to record the estimated losses (and subsequent recoveries). The accounting for the initial recognition of the estimated expected credit losses for purchased financial assets with credit deterioration would be recognized through an allowance for credit losses with an offset to the cost basis of the related financial asset at acquisition (i.e., there is no impact to net income at initial recognition). The Company plans to adopt ASU No. 2016-13 in the first quarter of 2020. The guidance is to be applied on a modified retrospective basis with the cumulative effect of initially applying the amendments recognized in retained earnings at the date of initial application. The Company has assembled a project team that meets regularly to evaluate the provisions of this ASU, identify additional data requirements necessary and determine an approach for implementation. The team has assigned roles and responsibilities and developed key tasks to complete and a general timeline to be followed. The Company is evaluating the effect that this ASU will have on the consolidated financial statements and disclosures. Economic conditions and the composition of the Company’s loan portfolio at the time of adoption will influence the extent of the adopting accounting adjustment. Compensation-retirement benefits-defined benefit plans . In August 2018, the FASB issued ASU 2018-14, “Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans,” which makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and

Segment financial information

Segment financial information	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Segment financial information	Note 2 · Segment financial information The electric utility and bank segments are strategic business units of the Company that offer different products and services and operate in different regulatory environments. The accounting policies of the segments are the same as those described for the Company in the summary of significant accounting policies, except as otherwise indicated and except that federal and state income taxes for each segment are calculated on a “stand-alone” basis. HEI evaluates segment performance based on net income. Each segment accounts for intersegment sales and transfers as if the sales and transfers were to third parties (i.e., at current market prices). Intersegment revenues consist primarily of Hamakua Energy revenues, interest, rent and preferred stock dividends. Electric utility Hawaiian Electric and its wholly owned operating subsidiaries, Hawaii Electric Light and Maui Electric, are public electric utilities in the business of generating, purchasing, transmitting, distributing and selling electric energy on all major islands in Hawaii other than Kauai, and are regulated by the PUC. The utility subsidiaries are aggregated within the electric utility segment because they: (1) are involved in the business of supplying electric energy in the same geographical location (i.e., the State of Hawaii), (2) have similar production processes that comprise electric generation, (3) serve similar customers within their franchise territories (e.g., residential, commercial and industrial customers), (4) use similar electric grids to distribute the energy to their customers, (5) are regulated by the PUC and undergo similar rate-making processes, (6) have similar economic characteristics and (7) perform financial reporting oversight and management of the business at the consolidated level. Bank ASB is a federally chartered savings bank that provides a full range of banking services to individual and business customers through its branch system in Hawaii. ASB is subject to examination and comprehensive regulation by the Office of the Comptroller of the Currency (OCC) and the Federal Deposit Insurance Corporation (FDIC), and is subject to reserve requirements established by the Board of Governors of the Federal Reserve System. Other “Other” includes amounts for the holding companies (HEI and ASB Hawaii, Inc.), Pacific Current, and other subsidiaries not qualifying as reportable segments, and intercompany eliminations. Pacific Current. Pacific Current was formed in September 2017 to focus on investing in non-regulated renewable energy and sustainable infrastructure in the State of Hawaii to help reach the state’s sustainability goals. Pacific Current’s investments through its subsidiaries, Hamakua Energy, LLC and Mauo, LLC, are as follows: Hamakua power plant . On November 24, 2017, Hamakua Energy, LLC acquired Hamakua Energy Partners, L.P.’s 60 -MW combined cycle power plant and other assets from affiliates of ArcLight Capital Partners, a private equity firm. The plant sells all the power it produces to Hawaii Electric Light under an existing power purchase agreement (PPA) that expires in 2030. Solar + Storage Power Purchase Agreement (PPA) . On February 2, 2018, Mauo, LLC executed definitive agreements to acquire a solar-plus-storage PPA for a multi-site, commercial-scale project that will provide 8.6 MW of solar capacity and 42.3 MWH of storage capacity on the islands of Maui and Oahu. The PPA has a 15 -year term with an option to extend for an additional five years. The system is being constructed by a third party contractor under an Engineering, Procurement and Construction (EPC) contract that was contemporaneously negotiated and executed by Mauo, LLC. The EPC contract provides a fixed price for the purchase of the completed system, a project completion schedule and performance obligations designed to match the requirements of the PPA. Mauo, LLC plans fund the construction of the project with a construction facility that will be repaid at the commercial operation date (ultimately with cash from investment tax credits, state renewable tax credits and non-recourse project debt). There are five separate project sites, which are expected to be placed into service during 2019 and 2020. Segment financial information was as follows: (in thousands) Electric utility Bank Other Total 2018 Revenues from external customers $ 2,546,472 $ 314,275 $ 102 $ 2,860,849 Intersegment revenues (eliminations) 53 — (53 ) — Revenues 2,546,525 314,275 49 2,860,849 Depreciation and amortization 230,228 21,443 3,958 255,629 Interest expense, net 73,348 15,539 15,329 104,216 Income (loss) before income taxes 180,426 106,578 (32,543 ) 254,461 Income taxes (benefit) 34,778 24,069 (8,050 ) 50,797 Net income (loss) 145,648 82,509 (24,493 ) 203,664 Preferred stock dividends of subsidiaries 1,995 — (105 ) 1,890 Net income (loss) for common stock 143,653 82,509 (24,388 ) 201,774 Capital expenditures 445,863 72,666 18,840 537,369 Assets (at December 31, 2018) 5,967,503 7,027,894 108,654 13,104,051 2017 Revenues from external customers $ 2,257,455 $ 297,640 $ 530 $ 2,555,625 Intersegment revenues (eliminations) 111 — (111 ) — Revenues 2,257,566 297,640 419 2,555,625 Depreciation and amortization 201,282 19,416 1,300 221,998 Interest expense, net 69,637 12,156 9,335 91,128 Income (loss) before income taxes 205,145 98,716 (27,281 ) 276,580 Income taxes (benefit) 83,199 31,719 (5,525 ) 109,393 Net income (loss) 121,946 66,997 (21,756 ) 167,187 Preferred stock dividends of subsidiaries 1,995 — (105 ) 1,890 Net income (loss) for common stock 119,951 66,997 (21,651 ) 165,297 Capital expenditures 441,598 53,272 317 495,187 Assets (at December 31, 2017) 1 5,630,613 6,798,659 104,888 12,534,160 (in thousands) Electric utility Bank Other Total 2016 Revenues from external customers $ 2,094,224 $ 285,924 $ 506 $ 2,380,654 Intersegment revenues (eliminations) 144 — (144 ) — Revenues 2,094,368 285,924 362 2,380,654 Depreciation and amortization 193,996 9,813 937 204,746 Interest expense, net 66,824 12,755 8,979 88,558 Income before income taxes 229,113 87,352 57,376 373,841 Income taxes 84,801 30,073 8,821 123,695 Net income 144,312 57,279 48,555 250,146 Preferred stock dividends of subsidiaries 1,995 — (105 ) 1,890 Net income for common stock 142,317 57,279 48,660 248,256 Capital expenditures 320,437 9,394 212 330,043 Assets (at December 31, 2016) 1 5,431,903 6,421,357 28,721 11,881,981 1 Contributions in aid of construction balances were reclassified from liabilities to “Property, plant and equipment, net” and “Total property, plant and equipment, net” for the Company and Hawaiian Electric, respectively, which reduced the amounts of the respective balances. Intercompany electricity sales of the Utilities to the bank and “other” segments are not eliminated because those segments would need to purchase electricity from another source if it were not provided by the Utilities and the profit on such sales is nominal. Bank fees that ASB charges the Utilities and “other” segments are not eliminated because those segments would pay fees to another financial institution if they were to bank with another institution and the profit on such fees is nominal. Hamakua Energy’s sales to Hawaii Electric Light (a regulated affiliate) are eliminated in consolidation.

Electric utility segment

Electric utility segment	12 Months Ended
	Dec. 31, 2018
Electric utility subsidiary
Electric utility segment	Note 3 · Electric utility segment Regulatory assets and liabilities. Regulatory assets represent deferred costs and accrued decoupling revenues which are expected to be recovered through rates over PUC-authorized periods. Generally, the Utilities do not earn a return on their regulatory assets; however, they have been allowed to recover interest on certain regulatory assets and to include certain regulatory assets in rate base. Regulatory liabilities represent amounts included in rates and collected from ratepayers for costs expected to be incurred in the future, or amounts collected in excess of costs incurred that are refundable to customers. For example, the regulatory liability for cost of removal in excess of salvage value represents amounts that have been collected from ratepayers for costs that are expected to be incurred in the future to retire utility plant. Generally, the Utilities include regulatory liabilities in rate base or are required to apply interest to certain regulatory liabilities. In the table below, noted in parentheses are the original PUC authorized amortization or recovery periods and, if different, the remaining amortization or recovery periods as of December 31, 2018 are noted. Regulatory assets were as follows: December 31 2018 2017 (in thousands) Retirement benefit plans (balance primarily varies with plans’ funded statuses) $ 624,126 $ 637,204 Income taxes (1-55 years) 114,076 118,201 Decoupling revenue balancing account and RAM regulatory asset (1-2 years) 49,560 64,087 Unamortized expense and premiums on retired debt and equity issuances (19-30 years; 6-18 years remaining) 10,065 11,993 Vacation earned, but not yet taken (1 year) 10,820 11,224 Other (1-50 years; 1-46 years remaining) 24,779 26,588 $ 833,426 $ 869,297 Included in: Current assets $ 71,016 $ 88,390 Long-term assets 762,410 780,907 $ 833,426 $ 869,297 Regulatory liabilities were as follows: December 31 2018 2017 (in thousands) Cost of removal in excess of salvage value (1-60 years) $ 491,006 $ 453,986 Income taxes (1-55 years) 413,339 406,324 Retirement benefit plans (5 years beginning with respective utility’s next rate case) 9,546 9,961 Other (5 years; 1-2 years remaining) 36,345 10,499 $ 950,236 $ 880,770 Included in: Current liabilities $ 17,977 $ 3,401 Long-term liabilities 932,259 877,369 $ 950,236 $ 880,770 The regulatory asset and liability relating to retirement benefit plans was recorded as a result of pension and OPEB tracking mechanisms adopted by the PUC in rate case decisions for the Utilities in 2007 (see Note 9 ). Major customers. The Utilities received 11% ( $273 million ), 11% ( $239 million ) and 11% ( $226 million ) of their operating revenues from the sale of electricity to various federal government agencies in 2018 , 2017 and 2016 , respectively. Cumulative preferred stock. The following series of cumulative preferred stock are redeemable only at the option of the respective company at the following prices in the event of voluntary liquidation or redemption: December 31, 2018 Voluntary liquidation price Redemption price Series C, D, E, H, J and K (Hawaiian Electric) $ 20 $ 21 I (Hawaiian Electric) 20 20 G (Hawaii Electric Light) 100 100 H (Maui Electric) 100 100 Hawaiian Electric is obligated to make dividend, redemption and liquidation payments on the preferred stock of each of its subsidiaries if the respective subsidiary is unable to make such payments, but this obligation is subordinated to Hawaiian Electric’s obligation to make payments on its own preferred stock. Related-party transactions. HEI charged the Utilities $ 5.9 million , $6.2 million and $6.5 million for general management and administrative services in 2018 , 2017 and 2016 , respectively. The amounts charged by HEI to its subsidiaries for services provided by HEI employees are allocated primarily on the basis of time expended in providing such services. For the year ended December 31, 2018 and from the period November 24, 2017 to December 31, 2017, Hamakua Energy, LLC (an indirect subsidiary of HEI) sold energy and capacity to Hawaii Electric Light (subsidiary of Hawaiian Electric and indirect subsidiary of HEI) under a PPA in the amount of $56 million and $3 million , respectively. Hawaiian Electric’s short-term borrowings from HEI totaled nil at December 31, 2018 and 2017 . The interest charged on short-term borrowings from HEI is based on the lower of HEI’s or Hawaiian Electric’s effective weighted average short-term external borrowing rate. If both HEI and Hawaiian Electric do not have short-term external borrowings, the interest is based on the average of the effective rate for 30 -day dealer-placed commercial paper quoted by the Wall Street Journal plus 0.15% . Borrowings among the Utilities are eliminated in consolidation. Interest charged by HEI to Hawaiian Electric was not material for the years ended December 31, 2018 and 2017 . HECO Capital Trust III. Trust III, a wholly-owned unconsolidated subsidiary of Hawaiian Electric, was created and exists for the exclusive purposes of (i) issuing in March 2004 2,000,000 6.50% Cumulative Quarterly Income Preferred Securities, Series 2004 (2004 Trust Preferred Securities) ( $50 million aggregate liquidation preference) to the public and trust common securities ( $1.5 million aggregate liquidation preference) to Hawaiian Electric, (ii) investing the proceeds of these trust securities in 2004 Debentures issued by Hawaiian Electric in the principal amount of $31.5 million and issued by Hawaii Electric Light and Maui Electric each in the principal amount of $10 million , (iii) making distributions on these trust securities and (iv) engaging in only those other activities necessary or incidental thereto. The 2004 Trust Preferred Securities are mandatorily redeemable at the maturity of the underlying debt on March 18, 2034, which maturity may be extended to no later than March 18, 2053; and are currently redeemable at the issuer’s option without premium. The 2004 Debentures, together with the obligations of the Utilities under an expense agreement and Hawaiian Electric’s obligations under its trust guarantee and its guarantee of the obligations of Hawaii Electric Light and Maui Electric under their respective debentures, are the sole assets of Trust III. Taken together, Hawaiian Electric’s obligations under the Hawaiian Electric debentures, the Hawaiian Electric indenture, the subsidiary guarantees, the trust agreement, the expense agreement and trust guarantee provide, in the aggregate, a full, irrevocable and unconditional guarantee of payments of amounts due on the Trust Preferred Securities. Trust III’s balance sheet as of December 31, 2018 consisted of $51.5 million of 2004 Debentures; $50.0 million of 2004 Trust Preferred Securities; and $1.5 million of trust common securities. Trust III’s income statement for 2018 consisted of $3.4 million of interest income received from the 2004 Debentures; $3.3 million of distributions to holders of the Trust Preferred Securities; and $0.1 million of common dividends on the trust common securities to Hawaiian Electric. As long as the 2004 Trust Preferred Securities are outstanding, Hawaiian Electric is not entitled to receive any funds from Trust III other than pro-rata distributions, subject to certain subordination provisions, on the trust common securities. In the event of a default by Hawaiian Electric in the performance of its obligations under the 2004 Debentures or under its Guarantees, or in the event any of the Utilities elect to defer payment of interest on any of their respective 2004 Debentures, then Hawaiian Electric will be subject to a number of restrictions, including a prohibition on the payment of dividends on its common stock. Unconsolidated variable interest entities. Power purchase agreements . As of December 31, 2018 , the Utilities had four PPAs for firm capacity (as PGV has been offline since May 2018 due to lava flow on Hawaii Island) and other PPAs with IPPs and Schedule Q providers (i.e., customers with cogeneration and/or power production facilities who buy power from or sell power to the Utilities), none of which is currently required to be consolidated as VIEs. Pursuant to the current accounting standards for VIEs, the Utilities are deemed to have a variable interest in Kalaeloa Partners, L.P. (Kalaeloa), AES Hawaii, Inc. (AES Hawaii) and the predecessor of Hamakua Energy by reason of the provisions of the PPA that the Utilities have with the three IPPs. However, management has concluded that the Utilities are not the primary beneficiary of Kalaeloa, AES Hawaii and the predecessor of Hamakua Energy because the Utilities do not have the power to direct the activities that most significantly impact the three IPPs’ economic performance nor the obligation to absorb their expected losses, if any, that could potentially be significant to the IPPs. Thus, the Utilities have not consolidated Kalaeloa, AES Hawaii and the predecessor of Hamakua Energy in its consolidated financial statements. In November 2017, HEI acquired the Hamakua project through Hamakua Energy, an indirect subsidiary of Pacific Current, and has consolidated it in HEI’s consolidated financial statements since the date of the acquisition. For the other PPAs with IPPs, the Utilities have concluded that the consolidation of the IPPs was not required because either the Utilities do not have variable interests in the IPPs due to the absence of an obligation in the PPAs for the Utilities to absorb any variability of the IPPs, or the IPP was considered a “governmental organization,” and thus excluded from the scope of accounting standards for VIEs. Two IPPs of as-available energy declined to provide the information necessary for Utilities to determine the applicability of accounting standards for VIEs. If information is ultimately received from the IPPs, a possible outcome of future analyses of such information is the consolidation of one or both of such IPPs in the Consolidated Financial Statements. The consolidation of any significant IPP could have a material effect on the Consolidated Financial Statements, including the recognition of a significant amount of assets and liabilities and, if such a consolidated IPP were operating at a loss and had insufficient equity, the potential recognition of such losses. If the Utilities determine they are required to consolidate the financial statements of such an IPP and the consolidation has a material effect, the Utilities would retrospectively apply accounting standards for VIEs to the IPP. Commitments and contingencies. Fuel contracts . The Utilities have fuel supply contracts with Island Energy Services, LLC (IES), for low sulfur fuel oil (LSFO), diesel, industrial fuel oil (IFO), and ultra-low sulfur diesel (ULSD), through December 31, 2019. On January 21, 2019, the Utilities and PAR Hawaii Refining, LLC, a Hawaii corporation (PAR), entered into a fuel supply contract for the Utilities' LSFO, high sulfur fuel oil (HSFO), No. 2 diesel (Diesel), and ULSD requirements (Contract), which is effective upon approval by the PUC and terminates on December 31, 2022. This Contract will supply all LSFO, HSFO, Diesel and ULSD for the islands of Oahu, Maui, Molokai and Hawaii. If PAR is unable to provide LSFO, HSFO, Diesel and/or ULSD the Contract allows the Utilities to purchase LSFO, HSFO, Diesel and/or ULSD from another supplier. The Contract will automatically renew upon the conclusion of the original term for successive terms of 1 year beginning on January 1, 2023 unless a party gives written termination notice at least 120 days before the beginning of an extension. The Contract is subject to approval of the PUC, and can be terminated by either party if approval is not received by January 22, 2020 or if the Utilities’ request for PUC approval is denied. If PUC approves the Contract prior to December 31, 2019, the existing fuel contracts with IES will terminate as agreed with IES under a mutual termination and release agreement entered into on November 28, 2018. All of the costs incurred under the fuel supply contracts with IES are included in the Utilities’ respective ECAC/ECRCs to the extent such costs are not recovered through the base rates, and the costs incurred under the contract with PAR are requested to be recovered in the Utilities’ respective ECAC/ECRCs to the extent such costs are not recovered through base rates. Based on the purchase price per barrel as of December 31, 2018 , the estimated cost of minimum purchases under the fuel supply contracts is $140 million in 2019 . The actual cost of purchases in 2019 could vary substantially from this estimate of minimum purchases as a result of changes in market prices, quantities actually purchased, entry into new supply contracts and/or other factors. The Utilities purchased $0.7 billion , $0.6 billion and $0.4 billion of fuel under contractual agreements in 2018 , 2017 and 2016 , respectively. Contingencies . The Utilities are subject in the normal course of business to pending and threatened legal proceedings. Management does not anticipate that the aggregate ultimate liability arising out of these pending or threatened legal proceedings will be material to its financial position. However, the Utilities cannot rule out the possibility that such outcomes could have a material effect on the results of operations or liquidity for a particular reporting period in the future. Interim increases . For the year ended December 31, 2018, the Utilities recognized $10 million of revenues with respect to the Maui Electric 2018 rate case interim order. Such amounts recorded are subject to refund, with interest, if they exceed amounts in a final order. Power purchase agreements . Purchases from all IPPs were as follows: Years ended December 31 2018 2017 2016 (in millions) Kalaeloa $ 216 $ 180 $ 152 AES Hawaii 140 140 149 HPOWER 69 67 71 Puna Geothermal Venture 15 38 28 Hamakua Energy 56 35 29 Hawaiian Commercial & Sugar — — 1 Wind IPPs 107 97 113 Solar IPPs 29 27 15 Other IPPs 1 7 3 5 Total IPPs $ 639 $ 587 $ 563 1 Includes hydro power and other PPAs As of December 31, 2018 , the Utilities had four firm capacity PPAs for a total of 516.5 megawatts (MW) of firm capacity. Since May 2018, PGV facility with 34.6 MW of firm capacity has been offline due to lava flow on Hawaii Island. The PUC allows rate recovery for energy and firm capacity payments to IPPs under these agreements. Assuming that each of the agreements remains in place for its current term (and as amended) and the minimum availability criteria in the PPAs are met, aggregate minimum fixed capacity charges are expected to be approximately $0.1 billion per year for 2019 through 2023 and a total of $0.3 billion in the period from 2024 through 2048. In general, the Utilities base their payments under the PPAs upon available capacity and actual energy supplied and they are generally not required to make payments for capacity if the contracted capacity is not available, and payments are reduced, under certain conditions, if available capacity drops below contracted levels. In general, the payment rates for capacity have been predetermined for the terms of the agreements. Energy payments will vary over the terms of the agreements. The Utilities pass on changes in the fuel component of the energy charges to customers through the ECAC/ECRC in their rate schedules. The Utilities do not operate, or participate in the operation of, any of the facilities that provide power under the agreements. Title to the facilities does not pass to Hawaiian Electric or its subsidiaries upon expiration of the agreements, and the agreements do not contain bargain purchase options for the facilities. Purchase power adjustment clause. The PUC has approved purchased power adjustment clauses (PPACs) for the Utilities. Purchased power capacity, O&M and other non-energy costs previously recovered through base rates are now recovered in the PPACs and, subject to approval by the PUC, such costs resulting from new purchased power agreements can be added to the PPACs outside of a rate case. Purchased energy costs continue to be recovered through the ECAC/ECRC to the extent they are not recovered through base rates. AES Hawaii, Inc. Under a PPA entered into in March 1988, as amended (through Amendment No. 2) for a period of 30 years ending September 2022, Hawaiian Electric agreed to purchase 180 MW of firm capacity from AES Hawaii. In August 2012, Hawaiian Electric filed an application with the PUC seeking an exemption from the PUC’s Competitive Bidding Framework to negotiate an amendment to the PPA to purchase 186 MW of firm capacity, and amend the energy pricing formula in the PPA. The PUC approved the exemption in April 2013, but Hawaiian Electric and AES Hawaii were not able to reach agreement on the amendment. In June 2015, AES Hawaii filed an arbitration demand regarding a dispute about whether Hawaiian Electric was obligated to buy up to 9 MW of additional capacity based on a 1992 letter. Hawaiian Electric responded to the arbitration demand and in October 2015, AES Hawaii and Hawaiian Electric entered into a settlement agreement to stay the arbitration proceeding. The settlement agreement included certain conditions precedent which, if satisfied, would have released the parties from the claims under the arbitration proceeding. Among the conditions precedent was the successful negotiation and PUC approval of an amendment to the existing PPA. In February 2018, Hawaiian Electric reached agreement with AES Hawaii on Amendment No. 4. However, in June 2018, the PUC issued an order suspending the Amendment No. 4 docket pending a DOH decision on AES’ request for approval of its Emission Reduction Plan and partnership with Hawaiian Electric. If approved by the PUC, Amendment No. 4 will resolve AES Hawaii’s claims. Hu Honua Bioenergy, LLC (Hu Honua). In May 2012, Hawaii Electric Light signed a PPA, which the PUC approved in December 2013, with Hu Honua Bioenergy, LLC (Hu Honua) for 21.5 MW of renewable, dispatchable firm capacity fueled by locally grown biomass from a facility on the island of Hawaii. Under the terms of the PPA, the Hu Honua plant was scheduled to be in service in 2016. However, Hu Honua encountered construction delays, failed to meet its obligations under the PPA and failed to provide adequate assurances that it could perform or had the financial means to perform. Hawaii Electric Light terminated the PPA on March 1, 2016. On November 30, 2016, Hu Honua filed a civil complaint in the United States District Court for the District of Hawaii that included claims purportedly arising out of the termination of Hu Honua’s PPA. On May 26, 2017, Hawaii Electric Light and Hu Honua entered into a settlement agreement that will settle all claims related to the termination of the original PPA. The settlement agreement was contingent on the PUC’s approval of an amended and restated PPA between Hawaii Electric Light and Hu Honua dated May 5, 2017. In July 2017, the PUC approved the amended and restated PPA, which becomes effective once the PUC’s order is final and non-appealable. On August 25, 2017, the PUC’s approval was appealed by a third party. The appeal is still pending. Hu Honua expects to be ready to be on-line by the end of March 2019. Utility projects . Many public utility projects require PUC approval and various permits from other governmental agencies. Difficulties in obtaining, or the inability to obtain, the necessary approvals or permits can result in significantly increased project costs or even cancellation of projects. In the event a project does not proceed, or if it becomes probable the PUC will disallow cost recovery for all or part of a project, or if PUC-imposed caps on project costs are expected to be exceeded, project costs may need to be written off in amounts that could result in significant reductions in Hawaiian Electric’s consolidated net income. Enterprise Resource Planning/Enterprise Asset Management (ERP/EAM) implementation project. On August 11, 2016, the PUC approved the Utilities’ request to commence the ERP/EAM implementation project, subject to certain conditions, including a $77.6 million cap on cost recovery as well as a requirement that the Utilities achieve future cost savings consistent with a minimum of $244 million in ERP/EAM project-related benefits to be delivered to customers over the system’s 12 -year service life. The decision and order (D&O) approved the deferral of certain project costs and allowed the accrual of allowance for funds used during construction (AFUDC), but limited the AFUDC rate to 1.75% . The ERP/EAM Implementation Project went live in October 2018. As of December 31, 2018 , the Utilities considered the project implementation completed with incurred costs of $77.5 million of which $16.7 million were charged to O&M expenses, $2.6 million relate to capital costs and $58.2 million are deferred costs. In the Hawaiian Electric 2017 rate case, a settlement agreement approved by the PUC included authorization for the deferred project costs to accrue a return at 1.75% after the project went into service and until the deferred project costs are included in rate base, and for amortization of the deferred costs to not begin until the amortization expense is incorporated in rates and the unamortized deferred project costs are included in rate base. As of December 31, 2018, the accrued carrying costs after the project went into service amounted to $0.2 million . In February 2019, the PUC approved a methodology for passing the benefits of the new ERP/EAM system to customers developed by the Utilities in collaboration with the Consumer Advocate. The minimum of $244 million in customer benefits to be delivered over the 12 -year service life is comprised of $141 million in future net O&M expense reductions and $103 million in future cost avoidance related to capital cost and tax cost. The O&M expense reduction commitments will be recognized as regulatory liabilities between rate cases and passed through to customers as reductions in rates in rate cases. The Utilities will file semi-annual reports detailing the O&M expense reduction benefits, capital cost avoidance benefits, and tax avoidance benefits. Schofield Generating Station Project. In June 2018, Hawaiian Electric placed into service an approximately 50 MW utility-owned and operated firm, renewable and dispatchable generation facility at Schofield Barracks. The project is located on land leased from the U.S. Army under a 35 -year lease. PUC orders resulted in a project cost cap of $157.3 million of which capital costs up to $141.6 million ( 90% of the cost cap) are recoverable through the Major Project Interim Recovery (MPIR) adjustment mechanism. (See “Decoupling” section below for MPIR guidelines and cost recovery discussion.) Project costs incurred as of December 31, 2018 amounted to $144.9 million . Cost recovery of capital costs in excess of $141.6 million is to be addressed in the next general rate case. West Loch PV Project. In June 2017, the PUC approved the expenditure of funds for Hawaiian Electric to build, own and operate a utility-owned, grid-tied 20 -MW (ac) solar facility on property owned by the Department of the Navy, including a proposed project cost cap of $67 million and a performance guarantee to provide energy at 9.56 cents/kWh or less to the system. In approving the project, the PUC agreed that the project is eligible for recovery of costs offset by related net benefits under the newly-established MPIR adjustment mechanism. (See “Decoupling” section below for MPIR guidelines and cost recovery discussion.) Hawaiian Electric has provided supplemental materials, as requested by the PUC, to support meeting the MPIR guidelines, accompanied by system performance guarantee and cost savings sharing mechanisms. A decision on these matters is pending. Hawaiian Electric executed a fixed-price Engineering, Procurement, and Construction (EPC) contract for the project on December 6, 2017. The EPC contract includes the cost of the solar panels for the project, which is not subject to modification due to any tariffs that may be imposed under the current photovoltaic (PV) cell and module import tariffs. Construction of the facility began in the second quarter of 2018, and the facility is expected to be placed in service in the second quarter of 2019. Project costs incurred as of December 31, 2018 amounted to $38.6 million . Hawaiian Telcom . The Utilities each had separate agreements for the joint ownership and maintenance of utility poles with Hawaiian Telcom, Inc. (Hawaiian Telcom), the respective county or counties in which each utility operates and other third parties, such as the State of Hawaii. The agreements set forth various circumstances requiring pole removal/installation/replacement and the sharing of costs among the joint pole owners. The agreements allowed for the cost of work done by one joint pole owner to be shared by the other joint pole owners based on the apportionment of costs in the agreements. The Utilities maintained, replaced and installed the majority of the jointly-owned poles in each of the respective service territories, and billed the other joint pole owners for their respective share of the costs. The counties and the State had been reimbursing the Utilities for their share of the costs. However, Hawaiian Telcom had been delinquent in reimbursing the Utilities for its share of the costs. Hawaiian Telcom’s delinquency was resolved by new agreements with Hawaiian Telcom approved by the PUC in October 2018. These new agreements provide for the purchase by the Utilities of Hawaiian Telcom’s interest in all the joint poles, and licensing and operating agreements between the Utilities and Hawaiian Telcom subsequent to the transfer of the joint pole interest to the Utilities, and a settlement on the amount Hawaiian Telcom owed the Utilities under the joint ownership and maintenance agreements. The Utilities’ consideration of approximately $48 million for Hawaiian Telcom’s interest in the poles was offset in part by the settlement of the outstanding receivables owed by Hawaiian Telcom to the Utilities of $19.1 million ( $12.3 million at Hawaiian Electric, $5.5 million at Hawaii Electric Light, and $1.3 million at Maui Electric). The remaining consideration for acquiring Hawaiian Telcom’s interest in the joint poles will be settled through the set-off of fees for unbilled poles (since the delinquency and dispute were raised) and for attachment fees and license fees for 2018, and future license fees due from Hawaiian Telcom, after which Hawaiian Telcom will make cash payments for license fees under the agreement. Environmental regulation . The Utilities are subject to environmental laws and regulations that regulate the operation of existing facilities, the construction and operation of new facilities and the proper cleanup and disposal of hazardous waste and toxic substances. Hawaiian Electric, Hawaii Electric Light and Maui Electric, like other utilities, periodically encounter petroleum or other chemical releases associated with current or previous operations. The Utilities report and take action on these releases when and as required by applicable law and regulations. The Utilities believe the costs of responding to such releases identified to date will not have a material effect, individually or in the aggregate, on Hawaiian Electric’s consolidated results of operations, financial condition or liquidity. Former Molokai Electric Company generation site . In 1989, Maui Electric acquired by merger Molokai Electric Company. Molokai Electric Company had sold its former generation site (Site) in 1983, but continued to operate at the Site under a lease until 1985. The EPA has since identified environmental impacts in the subsurface soil at the Site. Although Maui Electric never operated at the Site or owned the Site property, after discussions with the EPA and the DOH Maui Electric agreed to undertake additional investigations at the Site and an adjacent parcel that Molokai Electric Company had used for equipment storage (the Adjacent Parcel) to determine the extent of environmental contamination. A 2011 assessment by a Maui Electric contractor of the Adjacent Parcel identified environmental impacts, including elevated polychlorinated biphenyls (PCBs) in the subsurface soils. In cooperation with the DOH and EPA, Maui Electric is further investigating the Site and the Adjacent Parcel to determine the extent of impacts of PCBs, residual fuel oils, and other subsurface contaminants. Maui Electric has a reserve balance of $2.7 million as of December 31, 2018 , representing the probable and reasonably estimable cost to complete the additional investigation and estimated cleanup costs at the Site and the Adjacent Parcel; however, final costs of remediation will depend on the results of continued investigation. Pearl Harbor sediment study . In July 2014, the U.S. Navy notified Hawaiian Electric of the Navy’s determination that Hawaiian Electric is a Potentially Responsible Party responsible for the costs of investigation and cleanup of PCB contamination in sediment in the area offshore of the Waiau Power Plant as part of the Pearl Harbor Superfund Site. The Navy has completed a remedial investigation and a feasibility study (FS) for the remediation of contaminated sediment at several locations in Pearl Harbor and issued its Final FS Report on June 29, 2015. The Navy released the Proposed Plan on February 2, 2016 and the Record of Decision on September 26, 2018 for the Pearl Harbor Sediment Remediation. In the Record of Decision the Navy refined its estimate for the costs of remediation for the site to be $3.4 million . On March 23, 2015, Hawaiian Electric received a letter from the EPA requesting that Hawaiian Electric submit a work plan to assess potential sources and extent of PCB contamination onshore at the Waiau Power Plant. Onshore sampling at the Waiau Power Plant was completed in two phases in December 2015 and June 2016. Appropriate remedial measures are being developed to address the extent of the onshore contamination, and any associated costs have not yet been determined. As of December 31, 2018 , the reserve account balance recorded by Hawaiian Electric to address the PCB contamination was $ 4.8 million . The reserve balance represents the estimable cost for the onshore investigation and the remediation of PCB contamination in the offshore sediment. The final remediation costs will depend on the assessment of potential source control requirements for onshore sediment and actual offshore cleanup costs. Asset retirement obligations . AROs represent legal obligations associated with the retirement of certain tangible long-lived assets, are measured as the present value of the projected costs for the future retirement of specific assets and are recognized in the period in which the liability is incurred if a reasonable estimate of fair value can be made. The Utilities’ recognition of AROs have no impact on their earnings. The cost of the AROs is recovered over the life of the asset through depreciation. AROs recognized by the Utilities relate to legal obligations associated with the retirement of plant and equipment, including removal of asbestos and other hazardous materials. The Utilities recorded AROs related to the removal of retired generating units at Hawaiian Electric’s Honolulu and Waiau power plants, certain types of transformers and underground storage tanks, and the abandonment of fuel pipelines, underground injection and supply wells. In 2017, for the retired generating unit removal projects, the AROs were reassessed (resulting in a downward revision in estimated cash flows), the removal projects were completed and the AROs were reduced to nil . Changes to the ARO liability included in “Other liabilities” on Hawaiian Electric’s balance sheet were as follows: (in thousands) 2018 2017 Balance, January 1 $ 6,035 $ 25,589 Accretion expense 282 10 Liabilities incurred 1,058 5,370 Liabilities settled (74 ) (527 ) Revisions in estimated cash flows 1,125 (24,407 ) Balance, December 31 $ 8,426 $ 6,035 The Utilities have not recorded AROs for assets that are expected to operate indefinitely or where the Utilities cannot estimate a settlement date (or range of potential settlement dates). As such, ARO liabilities are not recorded for certain asset retirement activities, including various Utilities-owned generating facilities and certain electric transmission, distribution and telecommunications assets resulting from easements over property

Bank segment (HEI only)

Bank segment (HEI only)	12 Months Ended
	Dec. 31, 2018
Bank Segment Disclosure [Abstract]
Bank segment (HEI only)	Note 4 · Bank segment (HEI only) Selected financial information American Savings Bank, F.S.B. Statements of Income Data Years ended December 31 2018 2017 2016 (in thousands) Interest and dividend income Interest and fees on loans $ 220,463 $ 207,255 $ 199,774 Interest and dividends on investment securities 37,762 28,823 19,184 Total interest and dividend income 258,225 236,078 218,958 Interest expense Interest on deposit liabilities 13,991 9,660 7,167 Interest on other borrowings 1,548 2,496 5,588 Total interest expense 15,539 12,156 12,755 Net interest income 242,686 223,922 206,203 Provision for loan losses 14,745 10,901 16,763 Net interest income after provision for loan losses 227,941 213,021 189,440 Noninterest income Fees from other financial services 18,937 22,796 22,384 Fee income on deposit liabilities 21,311 22,204 21,759 Fee income on other financial products 7,052 7,205 8,707 Bank-owned life insurance 5,057 5,539 4,637 Mortgage banking income 1,493 2,201 6,625 Gains on sale of investment securities, net — — 598 Other income, net 2,200 1,617 2,256 Total noninterest income 56,050 61,562 66,966 Noninterest expense Compensation and employee benefits 98,387 94,931 89,242 Occupancy 17,073 16,699 16,321 Data processing 14,268 13,280 13,030 Services 10,847 10,994 11,054 Equipment 7,186 7,232 6,938 Office supplies, printing and postage 6,134 6,182 6,075 Marketing 3,567 3,501 3,489 FDIC insurance 2,713 2,904 3,543 Other expense 17,238 20,144 19,362 Total noninterest expense 177,413 175,867 169,054 Income before income taxes 106,578 98,716 87,352 Income taxes 24,069 31,719 30,073 Net income $ 82,509 $ 66,997 $ 57,279 Reconciliation to amounts per HEI Consolidated Statements of Income*: Years ended December 31 2018 2017 2016 (in thousands) Interest and dividend income $ 258,225 $ 236,078 $ 218,958 Noninterest income 56,050 61,562 66,966 *Revenues-Bank 314,275 297,640 285,924 Total interest expense 15,539 12,156 12,755 Provision for loan losses 14,745 10,901 16,763 Total noninterest expense 177,413 175,867 169,054 Less: Retirement defined benefits expense—other than service costs (1,657 ) (820 ) (875 ) *Expenses-Bank 206,040 198,104 197,697 *Operating income-Bank 108,235 99,536 88,227 Add back: Retirement defined benefits expense—other than service costs 1,657 820 875 Income before income taxes $ 106,578 $ 98,716 $ 87,352 Statements of Comprehensive Income Data Years ended December 31 2018 2017 2016 (in thousands) Net income $ 82,509 $ 66,997 $ 57,279 Other comprehensive income (loss), net of taxes: Net unrealized losses on available-for sale investment securities: Net unrealized losses on available-for sale investment securities arising during the period, net of tax benefits of $3,468, $2,886 and $3,763 for 2018, 2017 and 2016, respectively (9,472 ) (4,370 ) (5,699 ) Reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil and $238 for 2018, 2017 and 2016, respectively — — (360 ) Retirement benefit plans: Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $1,108, $812 and $566 for 2018, 2017 and 2016, respectively 2,353 1,231 857 Other comprehensive loss, net of tax benefits (7,119 ) (3,139 ) (5,202 ) Comprehensive income $ 75,390 $ 63,858 $ 52,077 Balance Sheets Data December 31 2018 2017 (in thousands) Assets Cash and due from banks $ 122,059 $ 140,934 Interest-bearing deposits 4,225 93,165 Investment securities Available-for-sale, at fair value 1,388,533 1,401,198 Held-to-maturity, at amortized cost (fair value of $142,057 and $44,412 at December 31, 2018 and 2017, respectively) 141,875 44,515 Stock in Federal Home Loan Bank, at cost 9,958 9,706 Loans held for investment 4,843,021 4,670,768 Allowance for loan losses (52,119 ) (53,637 ) Net loans 4,790,902 4,617,131 Loans held for sale, at lower of cost or fair value 1,805 11,250 Other 486,347 398,570 Goodwill 82,190 82,190 Total assets $ 7,027,894 $ 6,798,659 Liabilities and shareholder’s equity Deposit liabilities–noninterest-bearing $ 1,800,727 $ 1,760,233 Deposit liabilities–interest-bearing 4,358,125 4,130,364 Other borrowings 110,040 190,859 Other 124,613 110,356 Total liabilities 6,393,505 6,191,812 Commitments and contingencies Common stock 1 1 Additional paid in capital 347,170 345,018 Retained earnings 325,286 292,957 Accumulated other comprehensive loss, net of tax benefits Net unrealized losses on securities $ (24,423 ) $ (14,951 ) Retirement benefit plans (13,645 ) (38,068 ) (16,178 ) (31,129 ) Total shareholder’s equity 634,389 606,847 Total liabilities and shareholder’s equity $ 7,027,894 $ 6,798,659 December 31 2018 2017 (in thousands) Other assets Bank-owned life insurance $ 151,172 $ 148,775 Premises and equipment, net 214,415 136,270 Accrued interest receivable 20,140 18,724 Mortgage servicing rights 8,062 8,639 Low-income housing investments 67,626 59,016 Real estate acquired in settlement of loans, net 406 133 Other 24,526 27,013 $ 486,347 $ 398,570 Other liabilities Accrued expenses $ 54,084 $ 39,312 Federal and state income taxes payable 2,012 3,736 Cashier’s checks 26,906 27,000 Advance payments by borrowers 10,183 10,245 Other 31,428 30,063 $ 124,613 $ 110,356 Bank-owned life insurance is life insurance purchased by ASB on the lives of certain key employees, with ASB as the beneficiary. The insurance is used to fund employee benefits through tax-free income from increases in the cash value of the policies and insurance proceeds paid to ASB upon an insured’s death. The increase in premises and equipment, net was due to the expenditures of $76.5 million for the new campus project. Investment securities. The major components of investment securities were as follows: Gross unrealized losses Gross Gross Estimated Less than 12 months 12 months or longer (dollars in thousands) Amortized cost unrealized gains unrealized losses fair value Number of issues Fair value Amount Number of issues Fair value Amount December 31, 2018 Available-for-sale U.S. Treasury and federal agency obligations $ 156,694 $ 62 $ (2,407 ) $ 154,349 5 $ 25,882 $ (208 ) 19 $ 118,405 $ (2,199 ) Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,192,169 789 (31,542 ) 1,161,416 22 129,011 (1,330 ) 145 947,890 (30,212 ) Corporate bonds 49,398 103 (369 ) 49,132 6 23,175 (369 ) — — — Mortgage revenue bonds 23,636 — — 23,636 — — — — — — $ 1,421,897 $ 954 $ (34,318 ) $ 1,388,533 33 $ 178,068 $ (1,907 ) 164 $ 1,066,295 $ (32,411 ) Held-to-maturity Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies $ 141,875 $ 1,446 $ (1,264 ) $ 142,057 3 $ 29,814 $ (400 ) 2 $ 31,505 $ (864 ) $ 141,875 $ 1,446 $ (1,264 ) $ 142,057 3 $ 29,814 $ (400 ) 2 $ 31,505 $ (864 ) December 31, 2017 Available-for-sale U.S. Treasury and federal agency obligations $ 185,891 $ 438 $ (2,031 ) $ 184,298 15 $ 83,137 $ (825 ) 8 $ 62,296 $ (1,206 ) Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,220,304 793 (19,624 ) 1,201,473 67 653,635 (6,839 ) 77 459,912 (12,785 ) Mortgage revenue bond 15,427 — — 15,427 — — — — — — $ 1,421,622 $ 1,231 $ (21,655 ) $ 1,401,198 82 $ 736,772 $ (7,664 ) 85 $ 522,208 $ (13,991 ) Held-to-maturity Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies $ 44,515 $ 1 $ (104 ) $ 44,412 2 $ 35,744 $ (104 ) — $ — $ — $ 44,515 $ 1 $ (104 ) $ 44,412 2 $ 35,744 $ (104 ) — $ — $ — ASB does not believe that the investment securities that were in an unrealized loss position as of December 31, 2018 , represent an OTTI. Total gross unrealized losses were primarily attributable to change in market conditions. On a quarterly basis the investment securities are evaluated for changes in financial condition of the issuer. Based upon ASB’s evaluation, all securities held within the investment portfolio continue to be investment grade by one or more agencies. The contractual cash flows of the U.S. Treasury, federal agency obligations and agency mortgage-backed securities are backed by the full faith and credit guaranty of the United States government or an agency of the government. ASB does not intend to sell the securities before the recovery of its amortized cost basis and there have been no adverse changes in the timing of the contractual cash flows for the securities. ASB did not recognize OTTI for 2018 , 2017 and 2016 . U.S. Treasury, federal agency obligations, corporate bonds, and mortgage revenue bonds have contractual terms to maturity. Mortgage-backed securities have contractual terms to maturity, but require periodic payments to reduce principal. In addition, expected maturities will differ from contractual maturities because borrowers have the right to prepay the underlying mortgages. The contractual maturities of investment securities were as follows: Amortized Fair December 31, 2018 Cost value (in thousands) Available-for-sale Due in one year or less $ 20,002 $ 19,955 Due after one year through five years 117,549 116,508 Due after five years through ten years 76,750 75,227 Due after ten years 15,427 15,427 229,728 227,117 Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,192,169 1,161,416 Total available-for-sale securities $ 1,421,897 $ 1,388,533 Held-to-maturity Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies $ 141,875 $ 142,057 Total held-to-maturity securities $ 141,875 $ 142,057 The proceeds, gross gains and losses from sales of available-for-sale securities were as follows: Years ended December 31 2018 2017 2016 (in millions) Proceeds $ — $ — $ 16.4 Gross gains — — 0.6 Gross losses — — — Interest income from taxable and non-taxable investment securities were as follows: Years ended December 31 2018 2017 2016 (in thousands) Taxable $ 37,153 $ 28,398 $ 19,166 Non-taxable 609 425 18 $ 37,762 $ 28,823 $ 19,184 ASB pledged securities with a market value of approximately $546.1 million and $411.4 million as of December 31, 2018 and 2017 , respectively, as collateral for public funds and other deposits, automated clearinghouse transactions with Bank of Hawaii, borrowing at the discount window of the Federal Reserve Bank of San Francisco, and deposits in ASB’s bankruptcy account with the Federal Reserve Bank of San Francisco. As of December 31, 2018 and 2017 , securities with a carrying value of $92.0 million and $165.1 million , respectively, were pledged as collateral for securities sold under agreements to repurchase. Stock in FHLB . As of December 31, 2018 and 2017 , ASB’s stock in FHLB was carried at cost ( $10.0 million and $9.7 million , respectively) because it can only be redeemed at par and it is a required investment based on measurements of ASB’s capital, assets and borrowing levels. Quarterly and as conditions warrant, ASB reviews its investment in the stock of the FHLB for impairment. ASB evaluated its investment in FHLB stock for OTTI as of December 31, 2018 , consistent with its accounting policy. ASB did not recognize an OTTI loss for 2018 , 2017 and 2016 based on its evaluation of the underlying investment. Future deterioration in the FHLB’s financial position and/or negative developments in any of the factors considered in ASB’s impairment evaluation may result in future impairment losses. Loans. The components of loans were summarized as follows: December 31 2018 2017 (in thousands) Real estate: Residential 1-4 family $ 2,143,397 $ 2,118,047 Commercial real estate 748,398 733,106 Home equity line of credit 978,237 913,052 Residential land 13,138 15,797 Commercial construction 92,264 108,273 Residential construction 14,307 14,910 Total real estate 3,989,741 3,903,185 Commercial 587,891 544,828 Consumer 266,002 223,564 Total loans 4,843,634 4,671,577 Less: Deferred fees and discounts (613 ) (809 ) Allowance for loan losses (52,119 ) (53,637 ) Total loans, net $ 4,790,902 $ 4,617,131 ASB’s policy is to require private mortgage insurance on all real estate loans when the loan-to-value ratio of the property exceeds 80% of the lower of the appraised value or purchase price at origination. For non-owner occupied residential properties, the loan-to-value ratio may not exceed 80% of the lower of the appraised value or purchase price at origination. ASB services real estate loans for investors (principal balance of $1.2 billion as of December 31, 2018 , 2017 and 2016 ), which are not included in the accompanying balance sheets data. ASB reports fees earned for servicing such loans as income when the related mortgage loan payments are collected and charges loan servicing cost to expense as incurred. As of December 31, 2018 and 2017 , ASB had pledged loans with an amortized cost of approximately $2.7 billion and $ 2.4 billion , respectively, as collateral to secure advances from the FHLB. As of December 31, 2018 and 2017 , the aggregate amount of loans to directors and executive officers of ASB and its affiliates and any related interests (as defined in Federal Reserve Board (FRB) Regulation O) of such individuals, was $24.0 million and $23.8 million , respectively. As of December 31, 2018 and 2017 , $18.3 million and $18.7 million of the loan balances, respectively, were to related interests of individuals who are directors of ASB. All such loans were made at ASB’s normal credit terms. Allowance for loan losses. As discussed in Note 1 , ASB must maintain an allowance for loan losses that is adequate to absorb estimated probable credit losses associated with its loan portfolio. The allowance for loan losses (balances and changes) and financing receivables were as follows: (in thousands) Residential 1-4 family Commercial Home equity Residential land Commercial construction Residential construction Commercial Consumer Total December 31, 2018 Allowance for loan losses: Beginning balance $ 2,902 $ 15,796 $ 7,522 $ 896 $ 4,671 $ 12 $ 10,851 $ 10,987 $ 53,637 Charge-offs (128 ) — (353 ) (18 ) — — (2,722 ) (17,296 ) (20,517 ) Recoveries 74 — 257 179 — — 2,136 1,608 4,254 Provision (872 ) (1,291 ) (1,055 ) (578 ) (1,881 ) (8 ) (1,040 ) 21,470 14,745 Ending balance $ 1,976 $ 14,505 $ 6,371 $ 479 $ 2,790 $ 4 $ 9,225 $ 16,769 $ 52,119 Ending balance: individually evaluated for impairment $ 876 $ 7 $ 701 $ 6 $ — $ — $ 628 $ 4 $ 2,222 Ending balance: collectively evaluated for impairment $ 1,100 $ 14,498 $ 5,670 $ 473 $ 2,790 $ 4 $ 8,597 $ 16,765 $ 49,897 Financing Receivables: Ending balance $ 2,143,397 $ 748,398 $ 978,237 $ 13,138 $ 92,264 $ 14,307 $ 587,891 $ 266,002 $ 4,843,634 Ending balance: individually evaluated for impairment $ 16,494 $ 915 $ 14,800 $ 2,059 $ — $ — $ 5,340 $ 89 $ 39,697 Ending balance: collectively evaluated for impairment $ 2,126,903 $ 747,483 $ 963,437 $ 11,079 $ 92,264 $ 14,307 $ 582,551 $ 265,913 $ 4,803,937 December 31, 2017 Allowance for loan losses: Beginning balance $ 2,873 $ 16,004 $ 5,039 $ 1,738 $ 6,449 $ 12 $ 16,618 $ 6,800 $ 55,533 Charge-offs (826 ) — (14 ) (210 ) — — (4,006 ) (11,757 ) (16,813 ) Recoveries 157 — 308 482 — — 1,852 1,217 4,016 Provision 698 (208 ) 2,189 (1,114 ) (1,778 ) — (3,613 ) 14,727 10,901 Ending balance $ 2,902 $ 15,796 $ 7,522 $ 896 $ 4,671 $ 12 $ 10,851 $ 10,987 $ 53,637 Ending balance: individually evaluated for impairment $ 1,248 $ 65 $ 647 $ 47 $ — $ — $ 694 $ 29 $ 2,730 Ending balance: collectively evaluated for impairment $ 1,654 $ 15,731 $ 6,875 $ 849 $ 4,671 $ 12 $ 10,157 $ 10,958 $ 50,907 Financing Receivables: Ending balance $ 2,118,047 $ 733,106 $ 913,052 $ 15,797 $ 108,273 $ 14,910 $ 544,828 $ 223,564 $ 4,671,577 Ending balance: individually evaluated for impairment $ 18,284 $ 1,016 $ 8,188 $ 1,265 $ — $ — $ 4,574 $ 66 $ 33,393 Ending balance: collectively evaluated for impairment $ 2,099,763 $ 732,090 $ 904,864 $ 14,532 $ 108,273 $ 14,910 $ 540,254 $ 223,498 $ 4,638,184 December 31, 2016 Allowance for loan losses: Beginning balance $ 4,186 $ 11,342 $ 7,260 $ 1,671 $ 4,461 $ 13 $ 17,208 $ 3,897 $ 50,038 Charge-offs (639 ) — (112 ) (138 ) — — (5,943 ) (7,413 ) (14,245 ) Recoveries 421 — 59 461 — — 1,093 943 2,977 Provision (1,095 ) 4,662 (2,168 ) (256 ) 1,988 (1 ) 4,260 9,373 16,763 Ending balance $ 2,873 $ 16,004 $ 5,039 $ 1,738 $ 6,449 $ 12 $ 16,618 $ 6,800 $ 55,533 Ending balance: individually evaluated for impairment $ 1,352 $ 80 $ 215 $ 789 $ — $ — $ 1,641 $ 6 $ 4,083 Ending balance: collectively evaluated for impairment $ 1,521 $ 15,924 $ 4,824 $ 949 $ 6,449 $ 12 $ 14,977 $ 6,794 $ 51,450 Financing Receivables: Ending balance $ 2,048,051 $ 800,395 $ 863,163 $ 18,889 $ 126,768 $ 16,080 $ 692,051 $ 178,222 $ 4,743,619 Ending balance: individually evaluated for impairment $ 19,854 $ 1,569 $ 6,158 $ 3,629 $ — $ — $ 20,539 $ 10 $ 51,759 Ending balance: collectively evaluated for impairment $ 2,028,197 $ 798,826 $ 857,005 $ 15,260 $ 126,768 $ 16,080 $ 671,512 $ 178,212 $ 4,691,860 Credit quality . ASB performs an internal loan review and grading on an ongoing basis. The review provides management with periodic information as to the quality of the loan portfolio and effectiveness of its lending policies and procedures. The objectives of the loan review and grading procedures are to identify, in a timely manner, existing or emerging credit trends so that appropriate steps can be initiated to manage risk and avoid or minimize future losses. Loans subject to grading include commercial, commercial real estate and commercial construction loans. Each commercial and commercial real estate loan is assigned an Asset Quality Rating (AQR) reflecting the likelihood of repayment or orderly liquidation of that loan transaction pursuant to regulatory credit classifications: Pass, Special Mention, Substandard, Doubtful, and Loss. The AQR is a function of the probability of default model rating, the loss given default, and possible non-model factors which impact the ultimate collectability of the loan such as character of the business owner/guarantor, interim period performance, litigation, tax liens and major changes in business and economic conditions. Pass exposures generally are well protected by the current net worth and paying capacity of the obligor or by the value of the asset or underlying collateral. Special Mention loans have potential weaknesses that, if left uncorrected, could jeopardize the liquidation of the debt. Substandard loans have well-defined weaknesses that jeopardize the liquidation of the debt and are characterized by the distinct possibility that the Bank may sustain some loss. An asset classified Doubtful has the weaknesses of those classified Substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. An asset classified Loss is considered uncollectible and has such little value that its continuance as a bankable asset is not warranted. The credit risk profile by internally assigned grade for loans was as follows: December 31 2018 2017 (in thousands) Commercial real estate Commercial construction Commercial Total Commercial real estate Commercial construction Commercial Total Grade: Pass $ 658,288 $ 89,974 $ 547,640 $ 1,295,902 $ 630,877 $ 83,757 $ 492,942 $ 1,207,576 Special mention 32,871 — 11,598 44,469 49,347 22,500 27,997 99,844 Substandard 57,239 2,290 28,653 88,182 52,882 2,016 23,421 78,319 Doubtful — — — — — — 468 468 Loss — — — — — — — — Total $ 748,398 $ 92,264 $ 587,891 $ 1,428,553 $ 733,106 $ 108,273 $ 544,828 $ 1,386,207 The credit risk profile based on payment activity for loans was as follows: (in thousands) 30-59 days past due 60-89 days past due Greater than 90 days Total past due Current Total financing receivables Recorded investment> 90 days and accruing December 31, 2018 Real estate: Residential 1-4 family $ 3,757 $ 2,773 $ 2,339 $ 8,869 $ 2,134,528 $ 2,143,397 $ — Commercial real estate — — — — 748,398 748,398 — Home equity line of credit 1,139 681 2,720 4,540 973,697 978,237 — Residential land 9 — 319 328 12,810 13,138 — Commercial construction — — — — 92,264 92,264 — Residential construction — — — — 14,307 14,307 — Commercial 315 281 548 1,144 586,747 587,891 — Consumer 5,220 3,166 2,702 11,088 254,914 266,002 — Total loans $ 10,440 $ 6,901 $ 8,628 $ 25,969 $ 4,817,665 $ 4,843,634 $ — December 31, 2017 Real estate: Residential 1-4 family $ 1,532 $ 1,715 $ 5,071 $ 8,318 $ 2,109,729 $ 2,118,047 $ — Commercial real estate — — — — 733,106 733,106 — Home equity line of credit 425 114 2,051 2,590 910,462 913,052 — Residential land 23 — 625 648 15,149 15,797 — Commercial construction — — — — 108,273 108,273 — Residential construction — — — — 14,910 14,910 — Commercial 1,825 2,025 730 4,580 540,248 544,828 — Consumer 3,432 2,159 1,876 7,467 216,097 223,564 — Total loans $ 7,237 $ 6,013 $ 10,353 $ 23,603 $ 4,647,974 $ 4,671,577 $ — The credit risk profile based on nonaccrual loans, accruing loans 90 days or more past due, and TDR loans was as follows: December 31 2018 2017 (in thousands) Real estate: Residential 1-4 family $ 12,037 $ 12,598 Commercial real estate — — Home equity line of credit 6,348 4,466 Residential land 436 841 Commercial construction — — Residential construction — — Commercial 4,278 3,069 Consumer 4,196 2,617 Total nonaccrual loans $ 27,295 $ 23,591 Real estate: Residential 1-4 family $ — $ — Commercial real estate — — Home equity line of credit — — Residential land — — Commercial construction — — Residential construction — — Commercial — — Consumer — — Total accruing loans 90 days or more past due $ — $ — Real estate: Residential 1-4 family $ 10,194 $ 10,982 Commercial real estate 915 1,016 Home equity line of credit 11,597 6,584 Residential land 1,622 425 Commercial construction — — Residential construction — — Commercial 1,527 1,741 Consumer 62 66 Total troubled debt restructured loans not included above $ 25,917 $ 20,814 The total carrying amount and the total unpaid principal balance of impaired loans were as follows: December 31 2018 2017 (in thousands) Recorded investment Unpaid principal balance Related allowance Recorded investment Unpaid principal balance Related allowance With no related allowance recorded Real estate: Residential 1-4 family $ 7,822 $ 8,333 $ — $ 9,097 $ 9,644 $ — Commercial real estate — — — — — — Home equity line of credit 2,743 3,004 — 1,496 1,789 — Residential land 2,030 2,228 — 1,143 1,434 — Commercial construction — — — — — — Residential construction — — — — — — Commercial 3,722 4,775 — 2,328 3,166 — Consumer 32 32 — 8 8 — 16,349 18,372 — 14,072 16,041 — With an allowance recorded Real estate: Residential 1-4 family 8,672 8,875 876 9,187 9,390 1,248 Commercial real estate 915 915 7 1,016 1,016 65 Home equity line of credit 12,057 12,086 701 6,692 6,736 647 Residential land 29 29 6 122 122 47 Commercial construction — — — — — — Residential construction — — — — — — Commercial 1,618 1,618 628 2,246 2,252 694 Consumer 57 57 4 58 58 29 23,348 23,580 2,222 19,321 19,574 2,730 Total Real estate: Residential 1-4 family 16,494 17,208 876 18,284 19,034 1,248 Commercial real estate 915 915 7 1,016 1,016 65 Home equity line of credit 14,800 15,090 701 8,188 8,525 647 Residential land 2,059 2,257 6 1,265 1,556 47 Commercial construction — — — — — — Residential construction — — — — — — Commercial 5,340 6,393 628 4,574 5,418 694 Consumer 89 89 4 66 66 29 $ 39,697 $ 41,952 $ 2,222 $ 33,393 $ 35,615 $ 2,730 ASB’s average recorded investment of, and interest income recognized from, impaired loans were as follows: December 31 2018 2017 2016 (in thousands) Average Interest Average Interest Average Interest With no related allowance recorded Real estate: Residential 1-4 family $ 8,595 $ 445 $ 9,440 $ 316 $ 10,136 $ 324 Commercial real estate — — 91 11 1,124 — Home equity line of credit 2,206 75 1,976 101 1,105 23 Residential land 1,532 40 1,094 117 1,518 66 Commercial construction — — — — — — Residential construction — — — — — — Commercial 3,275 28 2,776 54 8,694 370 Consumer 22 — 1 — 2 — 15,630 588 15,378 599 22,579 783 With an allowance recorded Real estate: Residential 1-4 family 8,878 363 9,818 493 11,589 457 Commercial real estate 982 42 1,241 54 1,962 15 Home equity line of credit 10,617 440 5,045 251 3,765 137 Residential land 37 3 1,308 97 2,964 206 Commercial construction — — — — — — Residential construction — — — — — — Commercial 1,789 122 3,691 723 16,106 456 Consumer 57 4 57 3 12 — 22,360 974 21,160 1,621 36,398 1,271 Total Real estate: Residential 1-4 family 17,473 808 19,258 809 21,725 781 Commercial real estate 982 42 1,332 65 3,086 15 Home equity line of credit 12,823 515 7,021 352 4,870 160 Residential land 1,569 43 2,402 214 4,482 272 Commercial construction — — — — — — Residential construction — — — — — — Commercial 5,064 150 6,467 777 24,800 826 Consumer 79 4 58 3 14 — $ 37,990 $ 1,562 $ 36,538 $ 2,220 $ 58,977 $ 2,054 * Since loan was classified as impaired. Troubled debt restructurings. A loan modification is deemed to be a TDR when the borrower is determined to be experiencing financial difficulties and ASB grants a concession it would not otherwise consider. When a borrower experiencing financial difficulty fails to make a required payment on a loan or is in imminent default, ASB takes a number of steps to improve the collectability of the loan and maximize the likelihood of full repayment. At times, ASB may modify or restructure a loan to help a distressed borrower improve its financial position to eventually be able to fully repay the loan, provided the borrower has demonstrated both the willingness and the ability to fulfill the modified terms. TDR loans are considered an alternative to foreclosure or liquidation with the goal of minimizing losses to ASB and maximizing recovery. ASB may consider various types of concessions in granting a TDR including maturity date extensions, extended amortization of principal, temporary deferral of principal payments, and temporary interest rate reductions. ASB rarely grants principal forgiveness in its TDR modifications. Residential loan modifications generally involve interest rate reduction, extending the amortization period, or capitalizing certain delinquent amounts owed not to exceed the original loan balance. Land loans at origination are typically structured as a three -year term, interest-only monthly payment with a balloon payment due at maturity. Land loan TDR modifications typically involve extending the maturity date up to five years and converting the payments from interest-only to principal and interest monthly, at the same or higher interest rate. Commercial loan modifications generally involve extensions of maturity dates, extending the amortization period, and temporary deferral or reduction of principal payments. ASB generally does not reduce the interest rate on commercial loan TDR modifications. Occasionally, additional collateral and/or guaranties are obtained. All TDR loans are classified as impaired and are segregated and reviewed separately when assessing the adequacy of the allowance for loan losses based on the appropriate method of measuring impairment: (1) present value of expected future cash flows discounted at the loan’s effective original contractual rate, (2) fair value of collateral less cost to sell or (3) observable market price. The financial impact of the calculated impairment amount is an increase to the allowance associated with the modified loan. When available information confirms that specific loans or portions thereof are uncollectible (confirmed losses), these amounts are charged off against the allowance for loan losses. Loan modifications that occurred during 2018 , 2017 , and 2016 and the impact on the allowance for loan losses were as follows: (dollars in thousands) Number of contracts Outstanding recorded investment Net increase in ALLL Years ended Pre-modification Post-modification December 31, 2018 Real estate: Residential 1-4 family 5 $ 1,107 $ 1,133 $ 17 Commercial real estate — — — — Home equity line of credit 58 7,487 7,492 1,220 Residential land 5 1,776 1,786 — Commercial construction — — — — Residential construction — — — — Commercial 13 2,550 2,550 176 Consumer — — — — 81 $ 12,920 $ 12,961 $ 1,413 December 31, 2017 Real estate: Residential 1-4 family 7 $ 742 $ 750 $ 45 Commercial real estate — — — — Home equity line of credit 46 3,016 3,002 557 Residential land 1 92 92 — Commercial construction — — — — Residential construction — — — — Commercial 9 889 889 248 Consumer 1 59 59 27 64 $ 4,798 $ 4,792 $ 877 December 31, 2016 Real estate: Residential 1-4 family 14 $ 3,131 $ 3,245 $ 337 Commercial real estate — — — — Home equity line of credit 36 3,337 3,337 554 Residential land 2 203 204 — Commercial construction — — — — Residential construction — — — — Commercial 15 20,266 20,266 865 Consumer — — — — 67 $ 26,937 $ 27,052 $ 1,756 Loans modified in TDRs that experienced a payment default of 90 days or more in 2018 , 2017 , and 2016 and for which the payment default occurred within one year of the modification, were as follows: Years ended December 31 2018 2017 2016 (dollars in thousands) Number of contracts Recorded investment Number of contracts Recorded investment Number of Recorded Troubled debt restructurings that subsequently defaulted Real estate: Residential 1-4 family — $ — 1 $ 222 1 $ 239 Commercial real estate — — — — — — Home equity line of credit 1 81 — — — — Residential land — — — — — — Commercial construction — — — — — — Residential construction — — — — — — Commercial 1 246 — — 1 24 Consumer — — — — — — 2 $ 327 1 $ 222 2 $ 263 If loans modified in a TDR subsequently default, ASB evaluates the loan for further impairment. Based on its evaluation, adjustments may be made in the allocation of the allowance or partial charge-offs may be taken to further write-down the carrying value of the loan. Commitments to lend additional funds to borrowers whose loan terms have been modified in a TDR were nil at December 31, 2018 and 2017 . The Company had $4.2 million and $4.3 million of consumer mortgage loans collateralized by residential real estate property that were in the process of foreclosure at December 31, 2018 and 2017 , respectively. Mortgage servicing rights (MSRs). In its mortgage banking business, ASB sells residential mortgage loans to government-sponsored entities and other parties, who may issue securities backed by pools of such loans. ASB retains no beneficial interests in these loans other than the servicing rights of certain loans sold. ASB received $112.2 million , $128.0 million and $236.1 million of proceeds from the sale of residential mortgages in 2018 , 2017 , and 2016 , respectively, and recognized gains on such sales of $1.5 million , $2.2 million , and $6.6 million in 2018 , 2017 , and 2016 , respectively. Repurchased mortgage loans were nil for 2018 , 2017 and 2016 . Mortgage servicing fees, a component of other income, net, were $3.0 million , $3.0 million , and $2.9 million for the years ended December 31, 2018 , 2017 , and 2016 , respectively. Changes in the carrying value of MSRs were as follows: (in thousands) Gross 1 Accumulated amortization 1 Valuation allowance Net December 31, 2018 $ 18,556 $ (10,494 ) $ — $ 8,062 December 31, 2017 $ 17,511 $ (8,872 ) $ — $ 8,639 1 Reflects impact of loans paid in full. Changes related to MSRs were as follows: (in thousands) 2018 2017 2016 Mortgage servicing rights Balance, January 1 $ 8,639 $ 9,373 $ 8,884 Amount capitalized 1,045 1,239 2,740 Amortization (1,622 ) (1,973 ) (2,251 ) Sale of mortgage servicing rights — — — Other-than-temporary impairment — — — Carrying amount before valuation allowance, December 31 8,062 8,639 9,373 Valuation allowance for mortgage servicing rights Balance, January 1 — — — Provision (recovery) — — — Other-than-temporary impairment — — — Balance, December 31 — — — Net carrying value of mortgage servicing rights $ 8,062 $ 8,639 $ 9,373 The estimated aggregate amortization expenses of MSRs for 2019 , 2020 , 2021 , 2022 and 2023 are $1.1 million , $1.0 million , $0.9 million , $0.8 million and $0.7 million , respectively. ASB capitalizes MSRs acquired upon the sale of mortgage loans with servicing rights retained. On a monthly basis, ASB compares the net carrying value of the MSRs to its fair value to determine if there are any changes to the valuation allowance and/or other-than-temporary impairment for the MSRs. ASB’s MSRs are stratified based on predominant risk characteristics of the underlying loans including loan type such as fixed-rate 15- and 30-year mortgages and note rate in bands of 50

Short-term borrowings

Short-term borrowings	12 Months Ended
	Dec. 31, 2018
Short-term Debt [Abstract]
Short-term borrowings	Note 5 · Short-term borrowings As of December 31, 2018 , HEI had $49 million of outstanding commercial paper, with a weighted-average interest rate of 2.9% and Hawaiian Electric had no commercial paper outstanding. As of December 31, 2017 , HEI and Hawaiian Electric had $63 million and $5 million of commercial paper outstanding, respectively. As of December 31, 2018 , HEI and Hawaiian Electric maintained syndicated credit facilities of $150 million and $200 million , respectively (see description of credit agreements below). Both HEI and Hawaiian Electric had no borrowings under their respective facilities during 2017 and 2018 . None of the facilities are collateralized. As of December 31, 2018 , HEI had three letters of credit outstanding in the aggregate amount of $6.7 million on behalf of Hamakua Energy. Bank term loan. On November 29, 2018, Hawaiian Electric entered into a 364 -day, $50 million term loan credit agreement that matures on November 28, 2019. The term loan credit agreement includes substantially the same financial covenant and customary representations and warranties, affirmative and negative covenants, and events of default (the occurrence of which may result in the loan outstanding becoming immediately due and payable) consistent with those in Hawaiian Electric’s existing and amended revolving unsecured credit agreement, expiring on June 30, 2022. Hawaiian Electric drew the first $25 million on November 29, 2018 and the second $25 million on January 31, 2019. Credit agreements. HEI and Hawaiian Electric each entered into a separate agreement with a syndicate of eight financial institutions (the HEI Facility and Hawaiian Electric Facility, respectively, and together, the Facilities), effective July 3, 2017, to amend and restate their respective previously existing revolving unsecured credit agreements. The $150 million HEI Facility and $200 million Hawaiian Electric Facility both terminate on June 30, 2022. Under the Facilities, draws would generally bear interest, based on each company’s respective current long-term credit ratings, at the “Adjusted LIBO Rate,” as defined in the agreement, plus 1.375% and annual fees on undrawn commitments, excluding swingline borrowings, of 20 basis points. The Facilities contain provisions for pricing adjustments in the event of a long-term ratings change based on the respective Facilities’ ratings-based pricing grid, which includes the ratings by Fitch, Moody’s and S&P. Certain modifications were made to incorporate some updated terms and conditions customary for facilities of this type. The Facilities continue to contain customary conditions that must be met in order to draw on them, including compliance with covenants (such as covenants preventing HEI’s/Hawaiian Electric’s subsidiaries from entering into agreements that restrict the ability of the subsidiaries to pay dividends to, or to repay borrowings from, HEI/Hawaiian Electric; and a covenant in Hawaiian Electric’s facility restricting Hawaiian Electric’s ability, as well as the ability of any of its subsidiaries, to guarantee additional indebtedness of the subsidiaries if such additional debt would cause the subsidiary’s “Consolidated Subsidiary Funded Debt to Capitalization Ratio” to exceed 65% ). Under the HEI Facility, it is an event of default if HEI fails to maintain an unconsolidated “Capitalization Ratio” (funded debt) of 50% or less or if HEI no longer owns Hawaiian Electric or ASB. Under the Hawaiian Electric Facility, it is an event of default if Hawaiian Electric fails to maintain a “Consolidated Capitalization Ratio” (equity) of at least 35% , or if Hawaiian Electric is no longer owned by HEI. The Facilities will be maintained to support each company’s respective short-term commercial paper program, but may be drawn on to meet each company’s respective working capital needs and general corporate purposes.

Long-term debt

Long-term debt	12 Months Ended
	Dec. 31, 2018
Long-term Debt, Unclassified [Abstract]
Long-term debt	Note 6 · Long-term debt December 31 2018 2017 (dollars in thousands) Long-term debt of Utilities, net of unamortized debt issuance costs 1 $ 1,418,802 $ 1,368,479 Hamakua Energy 4.02% notes, due 2030 63,438 67,325 HEI 2.99% term loan, due 2022 150,000 150,000 HEI 5.67% senior notes, due 2021 50,000 50,000 HEI 3.99% senior notes, due 2023 50,000 50,000 HEI 4.58% senior notes, due 2025 50,000 — HEI 4.72% senior notes, due 2028 100,000 — Less unamortized debt issuance costs (2,599 ) (2,007 ) $ 1,879,641 $ 1,683,797 1 See components of “Total long-term debt” and unamortized debt issuance costs in Hawaiian Electric and subsidiaries’ Consolidated Statements of Capitalization. As of December 31, 2018 , the aggregate principal payments required on the Company’s long-term debt for 2019 through 2023 are $4 million in 2019 , $100 million in 2020 , $54 million in 2021 , $206 million in 2022 and $154 million in 2023 . As of December 31, 2018 , the aggregate payments of principal required on the Utilities’ long-term debt for 2019 through 2023 are nil in 2019 , $96 million in 2020 , nil in 2021 , $52 million in 2022 and $100 million in 2023 . The HEI term loans and senior notes contain customary representation and warranties, affirmative and negative covenants and events of default (the occurrence of which may result in some or all of the notes then outstanding becoming immediately due and payable). The HEI term loans and senior notes also contain provisions requiring the maintenance by HEI of certain financial ratios generally consistent with those in HEI’s existing, amended revolving unsecured credit agreement, expiring on June 30, 2022. Upon a change of control or certain dispositions of assets (as defined in the Master Note Purchase Agreements dated March 24, 2011 and October 4, 2018), HEI is required to offer to prepay the senior notes. The Utilities’ senior notes contain customary representations and warranties, affirmative and negative covenants, and events of default (the occurrence of which may result in some or all of the notes of each and all of the utilities then outstanding becoming immediately due and payable) and provisions requiring the maintenance by Hawaiian Electric, and each of Hawaii Electric Light and Maui Electric, of certain financial ratios generally consistent with those in Hawaiian Electric’s existing, amended revolving unsecured credit agreement, expiring on June 30, 2022. Changes in long-term debt. HEI . On October 4, 2018, HEI closed on a private placement transaction to issue $150 million senior unsecured notes in two tranches, as follows: HEI Series 2018A HEI Series 2018B Aggregate principal amount due at maturity $50 million $100 million Fixed coupon interest rate 4.58% 4.72% Maturity date December 15, 2025 December 15, 2028 Draw date October 4, 2018 December 18, 2018 Proceeds from the HEI Series 2018A tranche were used to repay HEI’s short-term borrowing with The Bank of Tokyo-Mitsubishi UFJ, Ltd, which matured on October 5, 2018. Proceeds from the HEI Series 2018B tranche drawn in December 2018 were used for general corporate purposes, including a contribution of approximately $71 million to Hawaiian Electric to maintain a targeted equity capitalization structure. Interest is paid semiannually on June 15th and December 15th. The note purchase agreement contains certain restrictive financial covenants that are substantially the same as the financial covenants contained in HEI’s senior credit facility, as amended. Mauo. In June 2018, Mauo, LLC, an indirect subsidiary of Pacific Current, LLC, entered into an unsecured $50.5 million construction loan facility in connection with the construction of the solar-plus-storage PPA project. The loan bears interest at LIBOR plus 1.375% and matures in March 2021. As of December 31, 2018 , no amounts were outstanding under the facility. The loan is guaranteed by HEI and contains restrictive covenants that are substantially the same as the financial covenants contained in HEI’s senior credit facility, as amended. Hawaiian Electric . On May 30, 2018, the Utilities issued, through a private placement pursuant to separate Note Purchase Agreements (the Note Purchase Agreements), the following unsecured notes bearing taxable interest (the Notes): Series 2018A Series 2018B Series 2018C Aggregate principal amount $67.5 million $17.5 million $15 million Fixed coupon interest rate 4.38% 4.53% 4.72% Maturity date May 30, 2028 May 30, 2033 May 30, 2048 State of Hawaii Department of Budget and Finance loaned the proceeds to: Hawaiian Electric $52 million $12.5 million $10.5 million Hawaii Electric Light $9 million $3 million $3 million Maui Electric $6.5 million $2 million $1.5 million The Notes include substantially the same financial covenants and customary conditions as Hawaiian Electric’s credit agreement. Hawaiian Electric is also a party as guarantor under the Note Purchase Agreements entered into by Hawaii Electric Light and Maui Electric. All the proceeds of the Notes were used by Hawaiian Electric, Hawaii Electric Light and Maui Electric to finance their capital expenditures and/or to reimburse funds used for the payment of capital expenditures. The Notes may be prepaid in whole or in part at any time at the prepayment price of the principal amount plus a “Make-Whole Amount,” as defined in the Note Purchase Agreements.

Shareholders' equity

Shareholders' equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Shareholders' equity	Note 7 · Shareholders’ equity Reserved shares. As of December 31, 2018 , HEI had reserved a total of 10,029,398 shares of common stock for future issuance under the HEI Dividend Reinvestment and Stock Purchase Plan (DRIP), the Hawaiian Electric Industries Retirement Savings Plan (HEIRSP), the HEI 2011 Nonemployee Director Stock Plan, the ASB 401(k) Plan and the 2010 Executive Incentive Plan. Accumulated other comprehensive income/(loss). Changes in the balances of each component of accumulated other comprehensive income/(loss) (AOCI) were as follows: HEI Consolidated Hawaiian Electric Consolidated (in thousands) Net unrealized gains (losses) on securities Unrealized gains (losses) on derivatives Retirement benefit plans AOCI Unrealized gains (losses) on derivatives Retirement benefit plans AOCI Balance, December 31, 2015 $ (1,872 ) $ (54 ) $ (24,336 ) $ (26,262 ) $ — $ 925 $ 925 Current period other comprehensive loss, net of taxes (6,059 ) (400 ) (408 ) (6,867 ) (454 ) (793 ) (1,247 ) Balance, December 31, 2016 (7,931 ) (454 ) (24,744 ) (33,129 ) (454 ) 132 (322 ) Current period other comprehensive income (loss), net of taxes (4,370 ) 454 2,544 (1,372 ) 454 (1,142 ) (688 ) Reclass of AOCI for tax rate reduction impact (2,650 ) — (4,790 ) (7,440 ) — (209 ) (209 ) Balance, December 31, 2017 (14,951 ) — (26,990 ) (41,941 ) — (1,219 ) (1,219 ) Current period other comprehensive income (loss), net of taxes (9,472 ) (436 ) 1,239 (8,669 ) — 1,318 1,318 Balance, December 31, 2018 $ (24,423 ) $ (436 ) $ (25,751 ) $ (50,610 ) $ — $ 99 $ 99 Reclassifications out of AOCI were as follows: Amount reclassified from AOCI Affected line item in the Statement of Years ended December 31 2018 2017 2016 Income/Balance Sheet (in thousands) HEI consolidated Net realized gains on securities included in net income $ — $ — $ (360 ) Revenues-bank (gains on sale of investment securities, net) Derivatives qualifying as cash flow hedges: Window forward contracts — 454 (173 ) Property, plant and equipment-electric utilities (2017); Revenues-electric utilities (gains on window forward contracts (2016) Interest rate contracts (settled in 2011) — — 54 Interest expense Retirement benefit plans: Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost 21,015 15,737 14,518 See Note 9 for additional details Impact of D&Os of the PUC included in regulatory assets 8,325 (78,724 ) 28,584 See Note 9 for additional details Total reclassifications $ 29,340 $ (62,533 ) $ 42,623 Hawaiian Electric consolidated Derivatives qualifying as cash flow hedges Window forward contracts $ — $ 454 $ (173 ) Property, plant and equipment (2017); Revenues (gains on window forward contracts (2016)) Retirement benefit plans: Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost 19,012 14,477 13,254 See Note 9 for additional details Impact of D&Os of the PUC included in regulatory assets 8,325 (78,724 ) 28,584 See Note 9 for additional details Total reclassifications $ 27,337 $ (63,793 ) $ 41,665

Revenues

Revenues	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenues	Note 8 · Revenues Adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606).” In the first quarter of 2018, the Company and Hawaiian Electric adopted ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” using the modified retrospective method. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts are not adjusted and continue to be reported in accordance with accounting standards in effect for those periods. The adoption of Topic 606 had no significant impact on the timing or pattern of revenue recognition for the Company or Hawaiian Electric. Revenue from contracts with customers. The revenues subject to Topic 606 include the Utilities’ electric energy sales revenue and the ASB’s transaction fees, as further described below. Electric Utilities . Electric energy sales . Electric energy sales represent revenues from the generation and transmission of electricity to customers under tariffs approved by the PUC. Transaction pricing for electricity is determined and approved by the PUC for each rate class and includes revenues from the base electric charges, which are composed of (1) the customer, demand, energy, and minimum charges, and (2) the power factor, service voltage, and other adjustments as provided in each rate and rate rider schedule. The Utilities satisfy performance obligations over time, i.e., the Utilities generate and transfer control of the electricity over time as the customer simultaneously receives and consumes the benefits provided by the Utilities’ performance. Payments from customers are generally due within 30 days from the end of the billing period. As electric bills to customers reflect the amount that corresponds directly with the value of the Utilities’ performance to date, the Utilities have elected to use the right to invoice practical expedient, which entitles them to recognize revenue in the amount they have the right to invoice. The Utilities’ revenues include amounts for recovery of various Hawaii state revenue taxes. Revenue taxes are generally recorded as an expense in the year the related revenues are recognized. For 2018, 2017 and 2016, the Utilities’ revenues include recovery of revenue taxes of approximately $226 million , $202 million and $187 million , respectively, which amounts are in “Taxes, other than income taxes” expense. However, the Utilities pay revenue taxes to the taxing authorities based on (1) the prior year’s billed revenues (in the case of public service company taxes and PUC fees) in the current year or (2) the current year’s cash collections from electric sales (in the case of franchise taxes) after year end. As of December 31, 2018 and 2017, the Utilities had recorded $130 million and $115 million , respectively, in “Taxes accrued, including revenue taxes” on the Utilities’ consolidated balance sheet for amounts previously collected from customers or accrued for public service company taxes and PUC fees, net of amounts paid to the taxing authorities. Such amounts will be used to pay public service company taxes and PUC fees owed for the following year. Bank . Bank fees. Bank fees are primarily transaction-based and are recognized when the transaction has occurred and the performance obligation satisfied. From time to time, customers will request a fee waiver and ASB may grant reversals of fees. Revenues are not recorded for the estimated amount of fee reversals for each period. Under the new standard, certain fees paid to third parties that were previously recognized as a component of noninterest expense are now netted with fee income. The change in presentation will have no effect on the reported amount of operating income. Fees from other financial services - These fees primarily include debit card interchange income and fees, automated teller machine fees, credit card interchange income and fees, check ordering fees, wire fees, safe deposit rental fees, corporate/business fees, merchant income, online banking fees and international banking fees. Amounts paid to third parties for payment network expenses are included in this financial statement caption in ASB’s Statements of Income Data (in Revenues—Bank financial statement caption of HEI’s Consolidated Statements of Income). Previously, these expenses were recorded in the other expense financial statement caption of ASB’s Statements of Income Data (in Expenses—Bank financial statement caption of HEI’s Consolidated Statements of Income). Fee income on deposit liabilities - These fees primarily include “not sufficient funds” fees, monthly deposit account service charge fees, commercial account analysis fees and other deposit fees. Fee income on other financial products - These fees primarily include commission income from the sales of annuity, mutual fund, and life insurance products. In 2017, ASB began offering a fee-based, managed account product in which income is based on a percentage of assets under management. ASB satisfies its performance obligations under the managed account arrangement over time, and consequently, fees for assets under management are recognized over time as the customer simultaneously receives and consumes the benefit of asset management services. Fees recognized to date from the managed account product were minimal. Revenues from other sources. Revenues from other sources not subject to Topic 606 are accounted for as follows: Electric Utilities . Regulatory revenues . Regulatory revenues primarily consist of revenues from decoupling mechanism, cost recovery surcharges and the Tax Act adjustments. Decoupling mechanism - Under the decoupling mechanism, the Utilities are allowed to recover or refund the difference between actual revenue and the target revenue as determined by the PUC, collect revenue adjustment mechanism and major project interim recovery revenues, and recover or refund performance incentive mechanism penalties or rewards. These adjustments will be reflected in tariffs in future periods. Cost recovery surcharges - For the timely recovery of additional costs incurred, and reconciliation of costs and expenses included in tariffed rates, the Utilities recognize revenues under surcharge mechanisms approved by the PUC. These will be reflected in tariffs in future periods (e.g., ECAC/ECRC and PPAC). Tax Act adjustments - These represent adjustments to revenues for the amounts included in tariffed revenues that will be returned to customers as a result of the Tax Act. Since revenue adjustments discussed above resulted from either agreements with the PUC or change in tax law, rather than contracts with customers, they are not subject to the scope of Topic 606. Also, see Notes 1 , 3 and 11 of the Consolidated Financial Statements. The Utilities have elected to present these revenue adjustments on a gross basis, which results in the amounts being billed to customers presented in revenues from contracts with customers and the amortization of the related regulatory asset/liability as revenues from other sources. Depending on whether the previous deferral balance being amortized was a regulatory asset or regulatory liability, and depending on the size and direction of the current year deferral of surcharges and/or refunds to customers, it could result in negative regulatory revenue during the year. Utility pole attachment fees . These fees primarily represent revenues from third-party companies for their access to and shared use of Utilities-owned poles through licensing agreements. As shared portion of the utility pole is functionally dependent on the rest of the structure, no distinct goods appear to exist. Therefore, these fees are not subject to the scope of Topic 606, but recognized in accordance with ASC Topic 610, Other Income . See note 3 of the Consolidated Financial Statements. Bank . Interest and dividend income . Interest and fees on loans are recognized in accordance with ASC Topic 310, Receivables , including the related allowance for loan losses. Interest and dividends on investment securities are recognized in accordance with ASC Topic 320, Investments-Debt and Equity Securities. See Notes 1 and 4 of the Consolidated Financial Statements. Other bank noninterest income . Other bank noninterest income primarily consists of mortgage banking income and bank-owned life insurance income. Mortgage banking income - Mortgage banking income consists primarily of realized and unrealized gains on sale of loans accounted for pursuant to ASC Topic 860, Transfers and Servicing . Interest rate lock commitments and forward loan sales are considered derivatives and are accounted pursuant to ASC Topic 815, Derivatives and Hedging . Bank-Owned Life Insurance (BOLI) - The recognition of BOLI cash surrender value does not represent a contract with a customer and is accounted for in accordance with Emerging Issues Task Force Issue 06-05, Accounting for Purchases of Life Insurance-Determining the Amount that Could be Realized in Accordance with FASB Technical Bulletin No. 85-4, Accounting for Purchases of Life Insurance . Revenue disaggregation. The following tables disaggregate revenues by major source, timing of revenue recognition, and segment: Year ended December 31, 2018 (in thousands) Electric utility Bank Other Total Revenues from contracts with customers Electric energy sales - residential $ 801,846 $ — $ — $ 801,846 Electric energy sales - commercial 853,672 — — 853,672 Electric energy sales - large light and power 894,770 — — 894,770 Electric energy sales - other 17,243 — — 17,243 Bank fees — 47,300 — 47,300 Total revenues from contracts with customers 2,567,531 47,300 — 2,614,831 Revenues from other sources Regulatory revenue (37,687 ) — — (37,687 ) Bank interest and dividend income — 258,225 — 258,225 Other bank noninterest income — 8,750 — 8,750 Other 16,681 — 49 16,730 Total revenues from other sources (21,006 ) 266,975 49 246,018 Total revenues $ 2,546,525 $ 314,275 $ 49 $ 2,860,849 Timing of revenue recognition Services/goods transferred at a point in time $ — $ 47,300 $ — $ 47,300 Services/goods transferred over time 2,567,531 — — 2,567,531 Total revenues from contracts with customers $ 2,567,531 $ 47,300 $ — $ 2,614,831 There are no material contract assets or liabilities associated with revenues from contracts with customers existing at the beginning or as of December 31, 2018 . Accounts receivable and unbilled revenues related to contracts with customers represent an unconditional right to consideration since all performance obligations have been satisfied. These amounts are disclosed as accounts receivable and unbilled revenues, net on HEI’s consolidated balance sheets and customer accounts receivable, net and accrued unbilled revenues, net on Hawaiian Electric’s consolidated balance sheets. As of December 31, 2018 , the Company had no material remaining performance obligations due to the nature of the Company’s contracts with its customers. For the Utilities, performance obligations are fulfilled as electricity is delivered to customers. For ASB, fees are recognized when a transaction is completed.

Retirement benefits

Retirement benefits	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Retirement benefits	Note 9 · Retirement benefits Defined benefit plans. Substantially all of the employees of HEI and the Utilities participate in the Retirement Plan for Employees of Hawaiian Electric Industries, Inc. and Participating Subsidiaries (HEI Pension Plan). Substantially all of the employees of ASB participated in the American Savings Bank Retirement Plan (ASB Pension Plan) until it was frozen on December 31, 2007. The HEI Pension Plan and the ASB Pension Plan (collectively, the Plans) are qualified, noncontributory defined benefit pension plans and include, in the case of the HEI Pension Plan, benefits for utility union employees determined in accordance with the terms of the collective bargaining agreements between the Utilities and the union. The Plans are subject to the provisions of ERISA. In addition, some current and former executives and directors of HEI and its subsidiaries participate in noncontributory, nonqualified plans (collectively, Supplemental Plans). In general, benefits are based on the employees’ or directors’ years of service and compensation. The continuation of the Plans and the Supplemental Plans and the payment of any contribution thereunder are not assumed as contractual obligations by the participating employers. The Supplemental Plan for directors has been frozen since 1996. The ASB Pension Plan was frozen as of December 31, 2007. The HEI Supplemental Executive Retirement Plan and ASB Supplemental Executive Retirement, Disability, and Death Benefit Plan (noncontributory, nonqualified, defined benefit plans) were frozen as of December 31, 2008. No participants have accrued any benefits under these plans after the respective plan’s freeze and the plans will be terminated at the time all remaining benefits have been paid. Each participating employer reserves the right to terminate its participation in the applicable plans at any time, and HEI and ASB reserve the right to terminate their respective plans at any time. If a participating employer terminates its participation in the Plans, the interest of each affected participant would become 100% vested to the extent funded. Upon the termination of the Plans, assets would be distributed to affected participants in accordance with the applicable allocation provisions of ERISA and any excess assets that exist would be paid to the participating employers. Participants’ benefits in the Plans are covered up to certain limits under insurance provided by the Pension Benefit Guaranty Corporation. Postretirement benefits other than pensions. HEI and the Utilities provide eligible employees health and life insurance benefits upon retirement under the Postretirement Welfare Benefits Plan for Employees of Hawaiian Electric Company, Inc. and participating employers (Hawaiian Electric Benefits Plan). Eligibility of employees and dependents is based on eligibility to retire at termination, the retirement date and the date of hire. The plan was amended in 2011, changing eligibility for certain bargaining unit employees hired prior to May 1, 2011, based on new minimum age and service requirements effective January 1, 2012, per the collective bargaining agreement, and certain management employees hired prior to May 1, 2011 based on new eligibility minimum age and service requirements effective January 1, 2012. The minimum age and service requirements for management and bargaining unit employees hired May 1, 2011 and thereafter have increased and their dependents are not eligible to receive postretirement benefits. Employees may be eligible to receive benefits from the HEI Pension Plan but may not be eligible for postretirement welfare benefits if the different eligibility requirements are not met. The executive death benefit plan was frozen on September 10, 2009 for participants at benefit levels as of that date. The Company’s and Utilities’ cost for OPEB has been adjusted to reflect the plan amendments, which reduced benefits and created prior service credits to be amortized over average future service of affected participants. The amortization of the prior service credit will reduce benefit costs over the next few years until the various credit bases are fully recognized. Each participating employer reserves the right to terminate its participation in the Hawaiian Electric Benefits Plan at any time. Balance sheet recognition of the funded status of retirement plans. Employers must recognize on their balance sheets the funded status of defined benefit pension and other postretirement benefit plans with an offset to AOCI in shareholders’ equity (using the projected benefit obligation (PBO) and accumulated postretirement benefit obligation (APBO), to calculate the funded status). The PUC allowed the Utilities to adopt pension and OPEB tracking mechanisms in previous rate cases. The amount of the net periodic pension cost (NPPC) and net periodic benefits costs (NPBC) to be recovered in rates is established by the PUC in each rate case. Under the Utilities’ tracking mechanisms, any actual costs determined in accordance with GAAP that are over/under amounts allowed in rates are charged/credited to a regulatory asset/liability. The regulatory asset/liability for each utility will then be amortized over 5 years beginning with the respective utility’s next rate case. Accordingly, all retirement benefit expenses (except for executive life and nonqualified pension plan expenses, which amounted to $1.0 million and $1.1 million in 2018 and 2017 , respectively) determined in accordance with GAAP will be recovered. Under the tracking mechanisms, amounts that would otherwise be recorded in AOCI (excluding amounts for executive life and nonqualified pension plans), net of taxes, as well as other pension and OPEB charges, are allowed to be reclassified as a regulatory asset, as those costs will be recovered in rates through the NPPC and NPBC in the future. The Utilities have reclassified to a regulatory asset/(liability) charges for retirement benefits that would otherwise be recorded in AOCI (amounting to the elimination of a potential charge to AOCI of $11.2 million pretax and $(128) million pretax for 2018 and 2017 , respectively). Under the pension tracking mechanism, the Utilities are required to make contributions to the pension trust in the amount of the actuarially calculated NPPC, except when limited by the ERISA minimum contributions requirements or the maximum contributions imposed by the Internal Revenue Code. Contributions in excess of the calculated NPPC are recorded in a separate regulatory asset. In 2018, the pension tracking mechanism was modified to allow prior year contributions made in excess of NPPC to satisfy future contributions, when the ERISA minimum required contribution is less than NPPC. The Utilities reduced their 2018 contribution for this modification. The OPEB tracking mechanisms generally require the Utilities to make contributions to the OPEB trust in the amount of the actuarially calculated NPBC, (excluding amounts for executive life), except when limited by material, adverse consequences imposed by federal regulations. Defined benefit pension and other postretirement benefit plans information. The changes in the obligations and assets of the Company’s and Utilities’ retirement benefit plans and the changes in AOCI (gross) for 2018 and 2017 and the funded status of these plans and amounts related to these plans reflected in the Company’s and Utilities’ consolidated balance sheet as of December 31, 2018 and 2017 were as follows: 2018 2017 (in thousands) Pension benefits Other benefits Pension benefits Other benefits HEI consolidated Benefit obligation, January 1 $ 2,094,356 $ 212,601 $ 1,935,494 $ 233,835 Service cost 68,987 2,721 64,906 3,374 Interest cost 77,374 7,933 81,185 9,453 Actuarial losses (gains) (171,226 ) (25,977 ) 87,399 (25,557 ) Participants contributions — 2,505 — 2,078 Benefits paid and expenses (78,107 ) (11,117 ) (74,628 ) (10,582 ) Benefit obligation, December 31 1,991,384 188,666 2,094,356 212,601 Fair value of plan assets, January 1 1,618,703 193,995 1,369,701 174,251 Actual return on plan assets (101,406 ) (11,846 ) 255,324 28,248 Employer contributions 38,496 — 66,983 — Participants contributions — 2,505 — 2,078 Benefits paid and expenses (76,726 ) (10,961 ) (73,305 ) (10,582 ) Fair value of plan assets, December 31 1,479,067 173,693 1,618,703 193,995 Accrued benefit asset (liability), December 31 $ (512,317 ) $ (14,973 ) $ (475,653 ) $ (18,606 ) Other assets $ 10,930 $ — $ 15,443 $ — Defined benefit pension and other postretirement benefit plans liability (523,247 ) (14,973 ) (491,096 ) (18,606 ) Accrued benefit asset (liability), December 31 $ (512,317 ) $ (14,973 ) $ (475,653 ) $ (18,606 ) AOCI debit, January 1 (excluding impact of PUC D&Os) $ 527,830 $ 1,474 $ 619,451 $ 42,290 Recognized during year – prior service credit 42 1,805 55 1,793 Recognized during year – net actuarial losses (30,084 ) (95 ) (26,496 ) (1,130 ) Occurring during year – net actuarial losses (gains) 39,132 (1,222 ) (65,180 ) (41,479 ) AOCI debit before cumulative impact of PUC D&Os, December 31 536,920 1,962 527,830 1,474 Cumulative impact of PUC D&Os (498,944 ) (4,929 ) (489,894 ) (2,767 ) AOCI debit/(credit), December 31 $ 37,976 $ (2,967 ) $ 37,936 $ (1,293 ) Net actuarial loss $ 536,954 $ 8,865 $ 527,907 $ 10,183 Prior service gain (34 ) (6,903 ) (77 ) (8,709 ) AOCI debit before cumulative impact of PUC D&Os, December 31 536,920 1,962 527,830 1,474 Cumulative impact of PUC D&Os (498,944 ) (4,929 ) (489,894 ) (2,767 ) AOCI debit/(credit), December 31 37,976 (2,967 ) 37,936 (1,293 ) Income taxes (benefits) (10,023 ) 765 (9,986 ) 333 AOCI debit/(credit), net of taxes (benefits), December 31 $ 27,953 $ (2,202 ) $ 27,950 $ (960 ) As of December 31, 2018 and 2017, the other postretirement benefit plans shown in the table above had ABOs in excess of plan assets. 2018 2017 (in thousands) Pension benefits Other benefits Pension benefits Other benefits Hawaiian Electric consolidated Benefit obligation, January 1 $ 1,928,648 $ 204,644 $ 1,779,626 $ 225,723 Service cost 67,359 2,704 63,059 3,353 Interest cost 71,294 7,628 74,632 9,115 Actuarial losses (gains) (158,258 ) (25,330 ) 80,186 (25,172 ) Participants contributions — 2,472 — 2,047 Benefits paid and expenses (71,535 ) (10,958 ) (68,691 ) (10,419 ) Transfers 145 2 (164 ) (3 ) Benefit obligation, December 31 1,837,653 181,162 1,928,648 204,644 Fair value of plan assets, January 1 1,468,403 190,814 1,233,184 171,383 Actual return on plan assets (91,836 ) (11,625 ) 237,830 27,806 Employer contributions 37,550 — 65,669 — Participants contributions — 2,472 — 2,047 Benefits paid and expenses (71,060 ) (10,801 ) (68,225 ) (10,419 ) Other 56 2 (55 ) (3 ) Fair value of plan assets, December 31 1,343,113 170,862 1,468,403 190,814 Accrued benefit liability, December 31 $ (494,540 ) $ (10,300 ) $ (460,245 ) $ (13,830 ) Other liabilities (short-term) (512 ) (669 ) (494 ) (633 ) Defined benefit pension and other postretirement benefit plans liability (494,028 ) (9,631 ) (459,751 ) (13,197 ) Accrued benefit liability, December 31 $ (494,540 ) $ (10,300 ) $ (460,245 ) $ (13,830 ) AOCI debit, January 1 (excluding impact of PUC D&Os) $ 493,464 $ 839 $ 579,725 $ 40,967 Recognized during year – prior service credit (cost) (8 ) 1,803 (8 ) 1,804 Recognized during year – net actuarial losses (27,302 ) (98 ) (24,392 ) (1,102 ) Occurring during year – net actuarial losses (gains) 36,035 (993 ) (61,861 ) (40,830 ) AOCI debit before cumulative impact of PUC D&Os, December 31 502,189 1,551 493,464 839 Cumulative impact of PUC D&Os (498,944 ) (4,929 ) (489,894 ) (2,767 ) AOCI debit/(credit), December 31 $ 3,245 $ (3,378 ) $ 3,570 $ (1,928 ) Net actuarial loss $ 502,173 $ 8,439 $ 493,439 $ 9,531 Prior service cost (gain) 16 (6,888 ) 25 (8,692 ) AOCI debit before cumulative impact of PUC D&Os, December 31 502,189 1,551 493,464 839 Cumulative impact of PUC D&Os (498,944 ) (4,929 ) (489,894 ) (2,767 ) AOCI debit/(credit), December 31 3,245 (3,378 ) 3,570 (1,928 ) Income taxes (benefits) (836 ) 870 (920 ) 497 AOCI debit/(credit), net of taxes (benefits), December 31 $ 2,409 $ (2,508 ) $ 2,650 $ (1,431 ) As of December 31, 2018 and 2017 , the other postretirement benefit plan shown in the table above had ABOs in excess of plan assets. The dates used to determine retirement benefit measurements for the defined benefit plans were December 31 of 2018 , 2017 and 2016 . For purposes of calculating NPPC and NPBC, the Company and the Utilities have determined the market-related value of retirement benefit plan assets by calculating the difference between the expected return and the actual return on the fair value of the plan assets, then amortizing the difference over future years – 0% in the first year and 25% in each of years two through five – and finally adding or subtracting the unamortized differences for the past four years from fair value. The method includes a 15% range restriction around the fair value of such assets (i.e., 85% to 115% of fair value). A primary goal of the plans is to achieve long-term asset growth sufficient to pay future benefit obligations at a reasonable level of risk. The investment policy target for defined benefit pension and OPEB plans reflects the philosophy that long-term growth can best be achieved by prudent investments in equity securities while balancing overall fund volatility by an appropriate allocation to fixed income securities. In order to reduce the level of portfolio risk and volatility in returns, efforts have been made to diversify the plans’ investments by asset class, geographic region, market capitalization and investment style. The asset allocation of defined benefit retirement plans to equity and fixed income securities (excluding cash) and related investment policy targets and ranges were as follows: Pension benefits 1 Other benefits 2 Investment policy Investment policy December 31 2018 2017 Target Range 2018 2017 Target Range Assets held by category Equity securities 69 % 73 % 70 % 65-75 70 % 73 % 70 % 65-75 Fixed income securities 31 27 30 25-35 30 27 30 25-35 100 % 100 % 100 % 100 % 100 % 100 % 1 Asset allocation is applicable to only HEI and the Utilities. As of December 31, 2018 and 2017 , nearly all of ASB’s pension assets were invested in fixed income securities. 2 Asset allocation is applicable to only HEI and the Utilities. ASB does not fund its other benefits. Assets held in various trusts for the retirement benefit plans are measured at fair value on a recurring basis and were as follows: Pension benefits Other benefits Fair value measurements using Fair value measurements using (in millions) December 31 Quoted prices in active markets for identical assets Significant other observable inputs Significant unobservable inputs December 31 Level 1 Level 2 Level 3 2018 Equity securities $ 507 $ 507 $ — $ — $ 65 $ 65 $ — $ — Equity index and exchange-traded funds 348 348 — — 42 42 — — Equity investments at net asset value (NAV) 65 — — — 10 — — — Total equity investments 920 855 — — 117 107 — — Fixed income securities and public mutual funds 310 123 187 — 47 45 2 — Fixed income investments at NAV 208 — — — 4 — — — Total fixed income investments 518 123 187 — 51 45 2 — Cash equivalents at NAV 36 — — — 5 — — — Total 1,474 $ 978 $ 187 $ — 173 $ 152 $ 2 $ — Cash, receivables and payables, net 5 1 Fair value of plan assets $ 1,479 $ 174 2017 Equity securities $ 568 $ 568 $ — $ — $ 75 $ 75 $ — $ — Equity index and exchange-traded funds 435 435 — — 52 52 — — Equity investments at NAV 76 — — — 12 — — — Total equity investments 1,079 1,003 — — 139 127 — — Fixed income securities and public mutual funds 297 81 216 — 46 43 3 — Fixed income investments at NAV 203 — — — 4 — — — Total fixed income investments 500 81 216 — 50 43 3 — Cash equivalents at NAV 36 — — — 5 — — — Total 1,615 $ 1,084 $ 216 $ — 194 $ 170 $ 3 $ — Cash, receivables and payables, net 4 — Fair value of plan assets $ 1,619 $ 194 Pension benefits Other benefits Measured at net asset value December 31 Redemption frequency Redemption notice period December 31 Redemption frequency Redemption notice period (in millions) 2018 Non U.S. equity funds (a) $ 65 Daily-Monthly 5 - 30 days $ 10 Daily-Monthly 5-30 days Fixed income investments (b) 208 Monthly 15 days 4 Monthly 15 days Cash equivalents (c) 36 Daily 0-1 day 5 Daily 0-1 day $ 309 $ 19 2017 Non U.S. equity funds (a) $ 76 Daily-Monthly 5 - 30 days $ 12 Daily-Monthly 5-30 days Fixed income investments (b) 203 Monthly 15 days 4 Monthly 15 days Cash equivalents (c) 36 Daily 0-1 day 5 Daily 0-1 day $ 315 $ 21 None of the investments presented in the tables above have unfunded commitments. (a) Represents investments in funds that primarily invest in non-U.S., emerging markets equities. Redemption frequency for pension benefits assets as of December 31, 2018 and 2017 both were: daily, 32% and monthly, 68% . Redemption frequency for other benefits assets as of December 31, 2018 were: daily, 27% and monthly, 73% and as of December 31, 2017 were: daily, 26% and monthly, 74% . (b ) Represents investments in fixed income securities invested in a US-dollar denominated fund that seeks to exceed the Barclays Capital Long Corporate A or better Index through investments in US-dollar denominated fixed income securities and commingled vehicles. (c) Represents investments in cash equivalent funds. This class includes funds that invest primarily in securities issued or guaranteed by the U.S. government or its agencies or instrumentalities. For pension benefits, the fund may also invest in fixed income securities of investment grade issuers. The fair values of the investments shown in the table above represent the Company’s best estimates of the amounts that would be received upon sale of those assets in an orderly transaction between market participants at that date. Those fair value measurements maximize the use of observable inputs. However, in situations where there is little, if any, market activity for the asset at the measurement date, the fair value measurement reflects the Company’s judgments about the assumptions that market participants would use in pricing the asset. Those judgments are developed by the Company based on the best information available in the circumstances. The fair value of investments measured at net asset value presented in the tables above are intended to permit reconciliation to the fair value of plan assets amounts. The Company used the following valuation methodologies for assets measured at fair value. There have been no changes in the methodologies used at December 31, 2018 and 2017 . Equity securities, equity index and exchange-traded funds, U.S. Treasury fixed income securities and public mutual funds (Level 1) . Equity securities, equity index and exchange-traded funds, U.S. Treasury fixed income securities and public mutual funds are valued at the closing price reported on the active market on which the individual securities or funds are traded. Fixed income securities (Level 2) . Fixed income securities, other than those issued by the U.S. Treasury, are valued based on yields currently available on comparable securities of issuers with similar credit ratings. The following weighted-average assumptions were used in the accounting for the plans: Pension benefits Other benefits December 31 2018 2017 2016 2018 2017 2016 Benefit obligation Discount rate 4.31 % 3.74 % 4.26 % 4.34 % 3.72 % 4.22 % Rate of compensation increase 3.50 3.50 3.50 NA NA NA Net periodic pension/benefit cost (years ended) Discount rate 3.74 4.26 4.60 3.72 4.22 4.57 Expected return on plan assets 1 7.50 7.50 7.75 7.50 7.50 7.75 Rate of compensation increase 2 3.50 3.50 3.50 NA NA NA NA Not applicable 1 HEI’s and Utilities’ plan assets only. For 2018, 2017 and 2016, ASB’s expected return on plan assets was 3.94% , 4.46% and 4.80% , respectively. 2 The Company and the Utilities use a graded rate of compensation increase assumption based on age. The rate provided above is an average across all future years of service for the current population. The Company and the Utilities based their selection of an assumed discount rate for 2019 NPPC and NPBC and December 31, 2018 disclosure on a cash flow matching analysis that utilized bond information provided by Bloomberg for all non-callable, high quality bonds (generally rated Aa or better) as of December 31, 2018 . In selecting the expected rate of return on plan assets for 2019 NPPC and NPBC: a) HEI and the Utilities considered economic forecasts for the types of investments held by the plans (primarily equity and fixed income investments), the Plans’ asset allocations, industry and corporate surveys and the past performance of the plans’ assets in selecting 7.25% and b) ASB considered its liability driven investment strategy in selecting 4.51% , which is consistent with the assumed discount rate as of December 31, 2018 with a 20 basis point active manager premium. For 2018, retirement benefit plans’ assets of HEI and the Utilities had a net loss of 6.5% . As of December 31, 2018 , the assumed health care trend rates for 2019 and future years were as follows: medical, 7.25% , grading down to 5% for 2028 and thereafter; dental, 5% ; and vision, 4% . As of December 31, 2017 , the assumed health care trend rates for 2018 and future years were as follows: medical, 7.50% , grading down to 5% for 2028 and thereafter; dental, 5% ; and vision, 4% . The components of NPPC and NPBC were as follows: Pension benefits Other benefits (in thousands) 2018 2017 2016 2018 2017 2016 HEI consolidated Service cost $ 68,987 $ 64,906 $ 60,555 $ 2,721 $ 3,374 $ 3,331 Interest cost 77,374 81,185 81,549 7,933 9,453 9,670 Expected return on plan assets (108,953 ) (102,745 ) (98,559 ) (12,908 ) (12,326 ) (12,273 ) Amortization of net prior service (gain) cost (42 ) (55 ) (57 ) (1,805 ) (1,793 ) (1,793 ) Amortization of net actuarial losses 30,084 26,496 24,832 95 1,130 804 Net periodic pension/benefit cost 67,450 69,787 68,320 (3,964 ) (162 ) (261 ) Impact of PUC D&Os 25,828 (18,004 ) (18,117 ) 3,842 1,211 1,343 Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ 93,278 $ 51,783 $ 50,203 $ (122 ) $ 1,049 $ 1,082 Hawaiian Electric consolidated Service cost $ 67,359 $ 63,059 $ 58,796 $ 2,704 $ 3,353 $ 3,284 Interest cost 71,294 74,632 74,808 7,628 9,115 9,337 Expected return on plan assets (102,368 ) (95,892 ) (91,633 ) (12,713 ) (12,147 ) (12,096 ) Amortization of net prior service (gain) cost 8 8 13 (1,803 ) (1,804 ) (1,803 ) Amortization of net actuarial losses 27,302 24,392 22,693 98 1,102 793 Net periodic pension/benefit cost 63,595 66,199 64,677 (4,086 ) (381 ) (485 ) Impact of PUC D&Os 25,828 (18,004 ) (18,117 ) 3,842 1,211 1,343 Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ 89,423 $ 48,195 $ 46,560 $ (244 ) $ 830 $ 858 The estimated prior service credit and net actuarial loss for defined benefit plans that will be amortized from AOCI or regulatory assets into NPPC and NPBC during 2019 is as follows: HEI consolidated Hawaiian Electric consolidated (in millions) Pension benefits Other benefits Pension benefits Other benefits Estimated prior service credit $ — $ (1.8 ) $ — $ (1.8 ) Net actuarial loss 15.4 — 14.3 — The Company recorded pension expense of $59 million , $33 million and $33 million and OPEB expense of nil , $1.0 million and $1.0 million in 2018 , 2017 and 2016 , respectively, and charged the remaining amounts primarily to electric utility plant. The Utilities recorded pension expense of $55 million , $30 million and $30 million and OPEB (income) expense of $(0.1) million , $0.8 million and $0.7 million in 2018 , 2017 and 2016 , respectively, and charged the remaining amounts primarily to electric utility plant. The health care cost trend rate assumptions can have a significant effect on the amounts reported for other benefits. As of December 31, 2018 , for the Company, a one-percentage-point increase in the assumed health care cost trend rates would have increased the total service and interest cost by $0.1 million and the accumulated postretirement benefit obligation (APBO) by $2.9 million , and a one-percentage-point decrease would have reduced the total service and interest cost by $0.1 million and the APBO by $3.3 million . As of December 31, 2018 , for the Utilities, a one-percentage-point increase in the assumed health care cost trend rates would have increased the total service and interest cost by $0.1 million and the APBO by $2.8 million , and a one-percentage-point decrease would have reduced the total service and interest cost by $0.1 million and the APBO by $3.2 million . Additional information on the defined benefit pension plans’ accumulated benefit obligations (ABOs), which do not consider projected pay increases (unlike the PBOs shown in the table above), PBOs and assets were as follows: HEI consolidated Hawaiian Electric consolidated December 31 2018 2017 2018 2017 (in billions) Defined benefit plans - ABOs $ 1.7 $ 1.8 $ 1.6 $ 1.7 Defined benefit plans with ABO in excess of plan assets ABOs 1.6 1.7 1.6 1.7 Plan assets 1.4 1.5 1.3 1.5 Defined benefit plans with PBOs in excess of plan assets PBOs 1.9 2.0 1.8 1.9 Plan assets 1.4 1.5 1.3 1.5 HEI consolidated . The Company estimates that the cash funding for the qualified defined benefit pension plans in 2019 will be $47 million , which should fully satisfy the minimum required contributions to those plans, including requirements of the Utilities’ pension tracking mechanisms and the Plan’s funding policy. The Company’s current estimate of contributions to its other postretirement benefit plans in 2019 is nil . As of December 31, 2018 , the benefits expected to be paid under all retirement benefit plans in 2019 , 2020 , 2021 , 2022 , 2023 and 2024 through 2028 amount to $88 million , $91 million , $95 million , $99 million , $103 million and $574 million , respectively. Hawaiian Electric consolidated . The Utilities estimate that the cash funding for the qualified defined benefit pension plan in 2019 will be $47 million , which should fully satisfy the minimum required contributions to that Plan, including requirements of the pension tracking mechanisms and the Plan’s funding policy. The Utilities’ current estimate of contributions to its other postretirement benefit plans in 2019 is nil . As of December 31, 2018 , the benefits expected to be paid under all retirement benefit plans in 2019 , 2020 , 2021 , 2022 , 2023 and 2024 through 2028 amounted to $81 million , $83 million , $87 million , $90 million , $93 million and $525 million , respectively. Defined contribution plans information. For 2018 , 2017 and 2016 , the Company’s expenses for its defined contribution pension plans under the HEIRSP and the ASB 401(k) Plan were $7 million , $7 million and $5 million , respectively, and cash contributions were $7 million , $6 million and $5 million , respectively. The Utilities’ expenses and cash contributions for its defined contribution pension plan under the HEIRSP for 2018 , 2017 and 2016 were $2.3 million , $2.0 million and $1.5 million , respectively.

Share-based compensation

Share-based compensation	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation	Note 10 · Share-based compensation Under the 2010 Equity and Incentive Plan, as amended, HEI can issue shares of common stock as incentive compensation to selected employees in the form of stock options, stock appreciation rights (SARs), restricted shares, restricted stock units, performance shares and other share-based and cash-based awards. The 2010 Equity and Incentive Plan (original EIP) was amended and restated effective March 1, 2014 (EIP) and an additional 1.5 million shares were added to the shares available for issuance under these programs. As of December 31, 2018 , approximately 3.2 million shares remained available for future issuance under the terms of the EIP, assuming recycling of shares withheld to satisfy minimum statutory tax liabilities relating to EIP awards, including an estimated 0.6 million shares that could be issued upon the vesting of outstanding restricted stock units and the achievement of performance goals for awards outstanding under long-term incentive plans (assuming that such performance goals are achieved at maximum levels). Restricted stock units awarded under the 2010 Equity and Incentive Plan in 2018 , 2017 , 2016 and 2015 will vest and be issued in unrestricted stock in four equal annual increments on the anniversaries of the grant date and are forfeited to the extent they have not become vested for terminations of employment during the vesting period, except that pro-rata vesting is provided for terminations due to death, disability and retirement. Restricted stock units expense has been recognized in accordance with the fair-value-based measurement method of accounting. Dividend equivalent rights are accrued quarterly and are paid at the end of the restriction period when the associated restricted stock units vest. Stock performance awards granted under the 2018-2020 and 2017-2019 long-term incentive plans (LTIP) entitle the grantee to shares of common stock with dividend equivalent rights once service conditions and performance conditions are satisfied at the end of the three -year performance period. LTIP awards are forfeited for terminations of employment during the performance period, except that pro-rata participation is provided for terminations due to death, disability and retirement based upon completed months of service after a minimum of 12 months of service in the performance period. Compensation expense for the stock performance awards portion of the LTIP has been recognized in accordance with the fair-value-based measurement method of accounting for performance shares. Under the 2011 Nonemployee Director Stock Plan (2011 Director Plan), HEI can issue shares of common stock as compensation to nonemployee directors of HEI, Hawaiian Electric and ASB. As of December 31, 2018 , there were 46,607 shares remaining available for future issuance under the 2011 Director Plan. Share-based compensation expense and the related income tax benefit were as follows: (in millions) 2018 2017 2016 HEI consolidated Share-based compensation expense 1 $ 7.8 $ 5.4 $ 4.8 Income tax benefit 1.1 1.9 1.6 Hawaiian Electric consolidated Share-based compensation expense 1 2.7 1.9 1.4 Income tax benefit 0.5 0.7 0.5 1 For 2018, 2017 and 2016, the Company has not capitalized any share-based compensation. Stock awards. Nonemployee director awards totaling $0.2 million were paid in cash (in lieu of common stock) in July 2016. HEI granted HEI common stock to nonemployee directors of HEI, Hawaiian Electric and ASB under the 2011 Director Plan as follows: (dollars in millions) 2018 2017 2016 Shares granted 38,821 35,770 19,846 Fair value $ 1.3 $ 1.2 $ 0.6 Income tax benefit 0.3 0.5 0.2 The number of shares issued to each nonemployee director of HEI, Hawaiian Electric and ASB is determined based on the closing price of HEI Common Stock on the grant date. Restricted stock units. Information about HEI’s grants of restricted stock units was as follows: 2018 2017 2016 Shares (1) Shares (1) Shares (1) Outstanding, January 1 197,047 $ 31.53 220,683 $ 29.57 210,634 $ 28.82 Granted 93,853 34.12 97,873 33.47 114,431 29.70 Vested (75,683 ) 30.56 (92,147 ) 28.88 (85,003 ) 27.84 Forfeited (14,859 ) 32.35 (29,362 ) 31.57 (19,379 ) 29.82 Outstanding, December 31 200,358 $ 33.05 197,047 $ 31.53 220,683 $ 29.57 Total weighted-average grant-date fair value of shares granted (in millions) $ 3.2 $ 3.3 $ 3.4 (1) Weighted-average grant-date fair value per share based on the average price of HEI common stock on the date of grant. For 2018 , 2017 and 2016 , total restricted stock units and related dividends that vested had a fair value of $2.7 million , $3.5 million and $2.8 million , respectively, and the related tax benefits were $0.4 million , $1.1 million and $0.9 million , respectively. As of December 31, 2018 , there was $4.0 million of total unrecognized compensation cost related to the nonvested restricted stock units. The cost is expected to be recognized over a weighted-average period of 2.5 years . Long-term incentive plan payable in stock. The 2017-2019 and 2018-2020 LTIPs provide for performance awards under the EIP of shares of HEI common stock based on the satisfaction of performance goals including a market condition goal. The number of shares of HEI common stock that may be awarded is fixed on the date the grants are made subject to the achievement of specified performance levels and calculated dividend equivalents. The potential payout varies from 0% to 200% of the number of target shares depending on the achievement of the goals. The market condition goal is based on HEI’s total shareholder return (TSR) compared to the Edison Electric Institute Index over the relevant three -year period. The other performance condition goals relate to EPS growth, return on average common equity (ROACE) and ASB’s efficiency ratio. The 2016-2018 LTIP provides for performance awards payable in cash, and thus is not included in the tables below. LTIP linked to TSR . Information about HEI’s LTIP grants linked to TSR was as follows: 2018 2017 2016 Shares (1) Shares (1) Shares (1) Outstanding, January 1 32,904 $ 39.51 83,106 $ 22.95 162,500 $ 27.66 Granted 37,832 38.21 37,204 39.51 — — Vested (issued or unissued and cancelled) — — (83,106 ) 22.95 (78,553 ) 32.69 Forfeited (5,158 ) 38.84 (4,300 ) 39.51 (841 ) 22.95 Outstanding, December 31 65,578 $ 38.81 32,904 $ 39.51 83,106 $ 22.95 Total weighted-average grant-date fair value of shares granted (in millions) $ 1.4 $ 1.5 $ — (1) Weighted-average grant-date fair value per share determined using a Monte Carlo simulation model. The grant date fair values of the shares were determined using a Monte Carlo simulation model utilizing actual information for the common shares of HEI and its peers for the period from the beginning of the performance period to the grant date and estimated future stock volatility and dividends of HEI and its peers over the remaining three -year performance period. The expected stock volatility assumptions for HEI and its peer group were based on the three-year historic stock volatility, and the annual dividend yield assumptions were based on dividend yields calculated on the basis of daily stock prices over the same three -year historical period. The following table summarizes the assumptions used to determine the fair value of the LTIP awards linked to TSR and the resulting fair value of LTIP awards granted: 2018 2017 Risk-free interest rate 2.29 % 1.46 % Expected life in years 3 3 Expected volatility 17.0 % 20.1 % Range of expected volatility for Peer Group 15.1% to 26.2% 15.4% to 26.0% Grant date fair value (per share) $ 38.20 $ 39.51 For 2017 , total vested LTIP awards linked to TSR and related dividends had a fair value of $1.9 million and the related tax benefits were $0.7 million . For 2016 , all vested shares in the table above were unissued and cancelled (i.e., lapsed) because the TSR performance goal was not met. As of December 31, 2018 , there was $1.2 million of total unrecognized compensation cost related to the nonvested performance awards payable in shares linked to TSR. The cost is expected to be recognized over a weighted-average period of 1.5 years . LTIP awards linked to other performance conditions . Information about HEI’s LTIP awards payable in shares linked to other performance conditions was as follows: 2018 2017 2016 Shares (1) Shares (1) Shares (1) Outstanding, January 1 131,616 $ 33.47 109,816 $ 25.18 222,647 $ 26.02 Granted 151,328 34.12 148,818 33.47 — — Vested — — (109,816 ) 25.18 (109,097 ) 26.89 Increase above target (cancelled) 13,858 33.49 — — (1,989 ) 25.26 Forfeited (20,633 ) 33.80 (17,202 ) 33.48 (1,745 ) 25.19 Outstanding, December 31 276,169 $ 33.80 131,616 $ 33.47 109,816 $ 25.18 Total weighted-average grant-date fair value of shares granted (at target performance levels) (in millions) $ 5.2 $ 5.0 $ — (1) Weighted-average grant-date fair value per share based on the average price of HEI common stock on the date of grant. For 2017 and 2016 , total vested LTIP awards linked to other performance conditions and related dividends had a fair value of $4.2 million and $3.6 million , respectively, and the related tax benefits were $1.6 million and $1.4 million , respectively. As of December 31, 2018 , there was $4.5 million of total unrecognized compensation cost related to the nonvested shares linked to performance conditions other than TSR. The cost is expected to be recognized over a weighted-average period of 1.5 years .

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income taxes	Note 11 · Income taxes The components of income taxes attributable to net income for common stock were as follows: HEI consolidated Hawaiian Electric consolidated Years ended December 31 2018 2017 2016 2018 2017 2016 (in thousands) Federal Current $ 42,903 $ 61,534 $ 59,873 $ 29,649 $ 36,267 $ 952 Deferred* (6,099 ) 33,967 43,666 (5,245 ) 35,229 70,513 Deferred tax credits, net (12 ) (20 ) 268 (12 ) (20 ) 268 36,792 95,481 103,807 24,392 71,476 71,733 State Current 17,361 10,076 16,473 13,210 8,947 9,232 Deferred (3,269 ) 3,868 3,452 (2,737 ) 2,808 3,873 Deferred tax credits, net (87 ) (32 ) (37 ) (87 ) (32 ) (37 ) 14,005 13,912 19,888 10,386 11,723 13,068 Total $ 50,797 $ 109,393 $ 123,695 $ 34,778 $ 83,199 $ 84,801 * The 2018 deferred income tax expense includes the final adjustment to reduce the provisional amount recorded in 2017 pursuant to Staff Accounting Bulletin No. 118 (SAB No. 118). See SAB No. 118 disclosure below for details of the accounting for the enactment of the Tax Act. A reconciliation of the amount of income taxes computed at the federal statutory rate to the amount provided in the consolidated statements of income was as follows: HEI consolidated Hawaiian Electric consolidated Years ended December 31 2018 2017 2016 2018 2017 2016 (in thousands) Amount at the federal statutory income tax rate $ 53,437 $ 96,796 $ 130,844 $ 37,889 $ 71,801 $ 80,190 Increase (decrease) resulting from: State income taxes, net of federal income tax benefit 11,832 9,789 13,915 8,080 7,584 8,494 Net deferred tax asset (liability) adjustment related to the Tax Act (9,540 ) 13,420 — (9,285 ) 9,168 — Other, net (4,932 ) (10,612 ) (21,064 ) (1,906 ) (5,354 ) (3,883 ) Total $ 50,797 $ 109,393 $ 123,695 $ 34,778 $ 83,199 $ 84,801 Effective income tax rate 20.0 % 39.6 % 33.1 % 19.3 % 40.6 % 37.0 % The tax effects of book and tax basis differences that give rise to deferred tax assets and liabilities were as follows: HEI consolidated Hawaiian Electric consolidated December 31 2018 2017 2018 2017 (in thousands) Deferred tax assets Regulatory liabilities, excluding amounts attributable to property, plant and equipment $ 104,868 $ 104,984 $ 104,868 $ 104,984 Allowance for bad debts 14,647 16,192 659 1,812 Other 46,036 24,397 26,522 11,253 Total deferred tax assets 165,551 145,573 132,049 118,049 Deferred tax liabilities Property, plant and equipment related 437,644 415,452 434,831 413,891 Regulatory assets, excluding amounts attributable to property, plant and equipment 37,345 38,314 37,345 38,314 Deferred RAM and RBA revenues 11,278 15,038 11,278 15,038 Retirement benefits 20,173 32,952 25,430 38,020 Other 31,629 32,247 6,362 6,827 Total deferred tax liabilities 538,069 534,003 515,246 512,090 Net deferred income tax liability $ 372,518 $ 388,430 $ 383,197 $ 394,041 The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences are deductible. Based upon historical taxable income and projections for future taxable income, management believes it is more likely than not the Company and the Utilities will realize substantially all of the benefits of the deferred tax assets. As of December 31, 2018 and 2017 , valuation allowances for deferred tax benefits were nil . The Utilities are included in the consolidated federal and Hawaii income tax returns of HEI and are subject to the provisions of HEI’s tax sharing agreement, which determines each subsidiary’s (or subgroup’s) income tax return liabilities and refunds on a standalone basis as if it filed a separate return (or subgroup consolidated return). The following is a reconciliation of the Company’s liability for unrecognized tax benefits for 2018 , 2017 and 2016 . HEI consolidated Hawaiian Electric consolidated (in millions) 2018 2017 2016 2018 2017 2016 Unrecognized tax benefits, January 1 $ 4.0 $ 3.8 $ 3.6 $ 3.5 $ 3.8 3.6 Additions based on tax positions taken during the year 0.3 0.9 — 0.3 0.4 — Reductions based on tax positions taken during the year — (0.2 ) (0.1 ) — (0.2 ) (0.1 ) Additions for tax positions of prior years 0.1 — 0.3 0.1 — 0.3 Reductions for tax positions of prior years (0.1 ) (0.5 ) — (0.1 ) (0.5 ) — Lapses of statute of limitations (2.2 ) — — (2.2 ) — — Unrecognized tax benefits, December 31 $ 2.1 $ 4.0 $ 3.8 $ 1.6 $ 3.5 $ 3.8 At December 31, 2018 and 2017 , there were $0.5 million and $0.5 million , respectively, of unrecognized tax benefits that, if recognized, would affect the Company’s annual effective tax rate. As of December 31, 2018 and 2017 , the Utilities had no unrecognized tax benefits that, if recognized, would affect the Utilities’ annual effective tax rate. The Company and Utilities believe that the unrecognized tax benefits will not significantly increase or decrease within the next 12 months. HEI consolidated. The Company recognizes interest accrued related to unrecognized tax benefits in “Interest expense-other than on deposit liabilities and other bank borrowings” and penalties, if any, in operating expenses. In 2018, 2017 and 2016, the Company recognized approximately $(0.1) million , $0.2 million and $0.2 million in interest expense. The Company had $0.4 million and $0.5 million of interest accrued as of December 31, 2018 and 2017 , respectively. Hawaiian Electric consolidated. The Utilities recognize interest accrued related to unrecognized tax benefits in “Interest expense and other charges, net” and penalties, if any, in operating expenses. In 2018 , 2017 and 2016 , the Utilities recognized approximately $0.1 million , $0.1 million and $0.03 million , respectively, in interest expense. Additional interest expense related to the Utilities’ unrecognized tax benefits was recognized at HEI Consolidated because of the Utilities NOL position. The Utilities had $0.3 million and $0.2 million of interest accrued as of December 31, 2018 and 2017 , respectively. As of December 31, 2018 , the disclosures above present the Company’s and the Utilities’ accruals for potential tax liabilities, which involve management’s judgment regarding the likelihood of the benefit being sustained. The final resolution of uncertain tax positions could result in adjustments to recorded amounts. Based on information currently available, the Company and the Utilities believe these accruals have adequately provided for potential income tax issues with federal and state tax authorities, and that the ultimate resolution of tax issues for all open tax periods will not have a material adverse effect on its results of operations, financial condition or liquidity. IRS examinations have been completed and settled through the tax year 2011 and the statute of limitations has expired for years prior to 2015, leaving subsequent years subject to IRS examination. The tax years 2011 and subsequent are still subject to examination by the Hawaii Department of Taxation. Major tax developments. The 2017 Tax Cuts and Jobs Act was the first comprehensive change in the law since the 1986 Tax Reform Act and has a continuing impact on U.S. taxpayers. The changes for corporate taxpayers are numerous but the following summarizes the provisions that have a major impact on the Company. Lower tax rate. The corporate income tax rate reduction from 35% to 21% lowers the Company’s effective tax rate in 2018 and the subsequent years. For the regulated Utilities, the excess ADIT resulting from the rate change is being returned to customers over various periods determined with the approval of the PUC. Bonus depreciation. The Tax Act allows 100% bonus depreciation through the end of 2022 for qualified property purchased and placed in service after September 27, 2017. However, property placed into service after September 27, 2017 are grandfathered under the pre-Tax Act rules allowing 50% bonus depreciation if subject to written binding purchase contracts prior to September 28, 2017. The Tax Act provides that property used in the trade or business of a regulated utility (including the furnishing or selling electrical energy) is not qualified property. Other applicable provisions. There are a number of other provisions in the Tax Act that have an impact on the Company, including the narrowing of the exclusions from taxability of certain contributions in aid of construction (CIAC), the repeal of the domestic production activities deduction (DPAD), non-deductibility of transportation fringe benefits excluded from employees income, and the increased limitation on the deductibility of executive compensation. SAB No. 118. On December 22, 2017, the SEC staff issued SAB No. 118 to address the application of GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Act. The Company applied the guidance in SAB No. 118 when accounting for enactment date effects of the Tax Act in 2017 and throughout 2018. At December 31, 2017, the Company had not completed its re-measurement of deferred tax assets and liabilities as a result of the reduction in the US federal corporate income tax rate to 21% and in accordance with SAB No. 118, recorded a provisional amount. The Tax Act’s reduction of the corporate tax rate to 21% resulted in a net deferred tax balance that was in excess of the taxes the Company expected to pay or be refunded in the future when the temporary differences creating these deferred taxes reverse. The excess related to the Utilities’ deferred taxes that are expected to be refunded in rates was reclassified to a regulatory liability that will be returned to the customers prospectively. The remaining excess was written off through deferred tax expense. Consequently, the Company recorded a provisional decrease in net deferred tax liabilities of $271.5 million ( $275.7 million at the Utilities) with the corresponding net adjustment to increase deferred tax expense of $13.4 million ( $9.2 million at the Utilities) and to increase the Utilities’ regulatory liabilities by $284.9 million . December 22, 2018 marked the end of the measurement period for purposes of SAB No. 118. Consequently, the Company (and Utilities) has completed the analysis, based on available Treasury and legislative guidance relating to the Tax Act. In 2018, the Company re-measured certain deferred tax assets and liabilities based on the rates at which they were expected to reverse in the future. For the period ended December 31, 2018, the net deferred tax liabilities decreased by $13.9 million ( $13.6 million at the Utilities) with the corresponding net adjustment that decreased deferred tax expense by $5.5 million ( $5.2 million at the Utilities) and increased the regulatory liability by $11.3 million . The decrease in deferred tax expense is included as a component of income tax expense and had the effect of decreasing the effective tax rate in 2018 from 22.1% to 20.0% ( 22.2% to 19.3% at the Utilities).

Cash flows

Cash flows	12 Months Ended
	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Cash flows	Note 12 · Cash flows Years ended December 31 2018 2017 2016 (in millions) Supplemental disclosures of cash flow information HEI consolidated Interest paid to non-affiliates, net of amounts capitalized $ 102 $ 83 $ 84 Income taxes paid (including refundable credits) 72 55 55 Income taxes refunded (including refundable credits) 34 1 45 Hawaiian Electric consolidated Interest paid to non-affiliates, net of amounts capitalized 73 63 62 Income taxes paid (including refundable credits) 64 26 1 Income taxes refunded (including refundable credits) 31 — 20 Supplemental disclosures of noncash activities HEI consolidated Property, plant and equipment Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 59 38 84 Common stock dividends reinvested in HEI common stock (financing) 1 — — 17 Loans transferred from held for investment to held for sale (investing) 1 41 24 Real estate acquired in settlement of loans (investing) — — 1 Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) — — 1 Common stock issued (gross) for director and executive/management compensation (financing) 2 4 11 7 Obligations to fund low income housing investments, net (investing) 12 13 — Transfer of retail repurchase agreements to deposit liabilities (financing) 102 — — Hawaiian Electric consolidated Electric utility property, plant and equipment Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 44 38 84 HEI Consolidated and Hawaiian Electric consolidated Electric utility property, plant and equipment Estimated fair value of noncash contributions in aid of construction (investing) 14 18 28 Acquisition of Hawaiian Telcom’s interest in joint poles (investing) 48 — — 1 The amounts shown represents common stock dividends reinvested in HEI common stock under the HEI DRIP in noncash transactions. 2 The amounts shown represent the market value of common stock issued for director and executive/management compensation and withheld to satisfy statutory tax liabilities.

Regulatory restrictions on net

Regulatory restrictions on net assets	12 Months Ended
	Dec. 31, 2018
Regulatory Capital Requirements [Abstract]
Regulatory restrictions on net assets	Note 13 · Regulatory restrictions on net assets The abilities of certain of HEI’s subsidiaries to pay dividends or make other distributions to HEI are subject to contractual and regulatory restrictions. Under the PUC Agreement, in the event that the consolidated common stock equity of the electric utility subsidiaries falls below 35% of the total capitalization of the electric utilities (including the current maturities of long-term debt, but excluding short-term borrowings), the electric utility subsidiaries would, absent PUC approval, be restricted in their payment of cash dividends to 80% of the earnings available for the payment of dividends in the current fiscal year and preceding five years, less the amount of dividends paid during that period. The PUC Agreement also provides that the foregoing dividend restriction shall not be construed as relinquishing any right the PUC may have to review the dividend policies of the electric utility subsidiaries. As of December 31, 2018 , the consolidated common stock equity of HEI’s electric utility subsidiaries was 57% of their total capitalization (as calculated for purposes of the PUC Agreement). As of December 31, 2018 , Hawaiian Electric and its subsidiaries had common stock equity of $2.0 billion of which approximately $782 million was not available for transfer to HEI in the form of dividends, loans or advances without regulatory approval. The ability of ASB to make capital distributions to HEI and other affiliates is restricted under federal law. Subject to a limited exception for stock redemptions that do not result in any decrease in ASB’s capital and would improve ASB’s financial condition, ASB is prohibited from declaring any dividends, making any other capital distributions, or paying a management fee to a controlling person if, following the distribution or payment, ASB would be deemed to be undercapitalized, significantly undercapitalized or critically undercapitalized. ASB is required to notify the FRB and OCC prior to making any capital distribution (including dividends) to HEI (through ASB Hawaii). All dividends are subject to review by the OCC and FRB and receipt of a letter from the FRB communicating the agencies’ non-objection to the payment of any dividend ASB proposes to declare and pay to ASB Hawaii and HEI. Generally, the FRB and OCC may disapprove or deny ASB’s request to make a capital distribution if the proposed distribution will cause ASB to become undercapitalized, or the proposed distribution raises safety and soundness concerns, or the proposed distribution violates a prohibition contained in any statute, regulation or agreement between ASB and the OCC. As of December 31, 2018 , in order to maintain its “well-capitalized” position, ASB could not transfer approximately $474 million of net assets to HEI. HEI and its subsidiaries are also subject to debt covenants, preferred stock resolutions and the terms of guarantees that could limit their respective abilities to pay dividends. The Company does not expect that the regulatory and contractual restrictions applicable to HEI and/or its subsidiaries will significantly affect the operations of HEI or its ability to pay dividends on its common stock.

Significant group concentration

Significant group concentrations of credit risk	12 Months Ended
	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Significant group concentrations of credit risk	Note 14 · Significant group concentrations of credit risk Most of the Company’s business activity is with customers located in the State of Hawaii. The Utilities are regulated operating electric public utilities engaged in the generation, purchase, transmission, distribution and sale of electricity on the islands of Oahu, Hawaii, Maui, Lanai and Molokai in the State of Hawaii. The Utilities provide the only electric public utility service on the islands they serve. The Utilities grant credit to customers, all of whom reside or conduct business in the State of Hawaii. See Note 3 of the Consolidated Financial Statements for a discussion of the Utilities’ major customers. Most of ASB’s financial instruments are based in the State of Hawaii, except for the investment securities it owns. Substantially all real estate loans are collateralized by real estate in Hawaii. ASB’s policy is to require mortgage insurance on all real estate loans with a loan to appraisal ratio in excess of 80% at origination. Pacific Current’s strategy is focused on investing in non-regulated renewable energy and sustainable infrastructure in the State of Hawaii.

Fair value measurements

Fair value measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair value measurements	Note 15 · Fair value measurements Fair value measurement and disclosure valuation methodology. The following are descriptions of the valuation methodologies used for assets and liabilities recorded at fair value and for estimating fair value for financial instruments not carried at fair value: Short-term borrowings—other than bank . The carrying amount of short-term borrowings approximated fair value because of the short maturity of these instruments. Investment securities . The fair value of ASB’s investment securities is determined quarterly through pricing obtained from independent third-party pricing services or from brokers not affiliated with the trade. Non-binding broker quotes are infrequent and generally occur for new securities that are settled close to the month-end pricing date. The third-party pricing vendors ASB uses for pricing its securities are reputable firms that provide pricing services on a global basis and have processes in place to ensure quality and control. The third-party pricing services use a variety of methods to determine the fair value of securities that fall under Level 2 of ASB’s fair value measurement hierarchy. Among the considerations are quoted prices for similar securities in an active market, yield spreads for similar trades, adjustments for liquidity, size, collateral characteristics, historic and generic prepayment speeds, and other observable market factors. To enhance the robustness of the pricing process, ASB will on a quarterly basis compare its standard third-party vendor’s price with that of another third-party vendor. If the prices are within an acceptable tolerance range, the price of the standard vendor will be accepted. If the variance is beyond the tolerance range, an evaluation will be conducted by ASB and a challenge to the price may be made. Fair value in such cases will be based on the value that best reflects the data and observable characteristics of the security. In all cases, the fair value used will have been independently determined by a third-party pricing vendor or non-affiliated broker. The fair value of the mortgage revenue bonds is estimated using a discounted cash flow model to calculate the present value of future principal and interest payments and, therefore is classified within Level 3 of the valuation hierarchy. Loans held for sale . Residential and commercial loans are carried at the lower of cost or market and are valued using market observable pricing inputs, which are derived from third party loan sales and, therefore, are classified within Level 2 of the valuation hierarchy. Loans held for investment . Fair value of loans held for investment is derived using a discounted cash flow approach which includes an evaluation of the underlying loan characteristics. The valuation model uses loan characteristics which includes product type, maturity dates, and the underlying interest rate of the portfolio. This information is input into the valuation models along with various forecast valuation assumptions including prepayment forecasts, to determine the discount rate. These assumptions are derived from internal and third party sources. Since the valuation is derived from model-based techniques, ASB includes loans held for investment within Level 3 of the valuation hierarchy. Impaired loans . At the time a loan is considered impaired, it is valued at the lower of cost or fair value. Fair value is determined primarily by using an income, cost, or market approach and is normally provided through appraisals. Impaired loans carried at fair value generally receive specific allocations within the allowance for loan losses. For collateral-dependent loans, fair value is commonly based on recent real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches, including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments typically result in a Level 3 classification of the inputs for determining fair value. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, resulting in a Level 3 fair value classification. Generally, impaired loans are evaluated quarterly for additional impairment and adjusted accordingly. Real estate acquired in settlement of loans . Foreclosed assets are carried at fair value (less estimated costs to sell) and are generally based upon appraisals or independent market prices that are periodically updated subsequent to classification as real estate owned. Such adjustments typically result in a Level 3 classification of the inputs for determining fair value. ASB estimates the fair value of collateral-dependent loans and real estate owned using the sales comparison approach. Mortgage servicing rights . Mortgage servicing rights (MSRs) are capitalized at fair value based on market data at the time of sale and accounted for in subsequent periods at the lower of amortized cost or fair value. MSRs are evaluated for impairment at each reporting date. ASB’s MSRs are stratified based on predominant risk characteristics of the underlying loans including loan type and note rate. For each stratum, fair value is calculated by discounting expected net income streams using discount rates that reflect industry pricing for similar assets. Expected net income streams are estimated based on industry assumptions regarding prepayment expectations and income and expenses associated with servicing residential mortgage loans for others. Impairment is recognized through a valuation allowance for each stratum when the carrying amount exceeds fair value, with any associated provision recorded as a component of loan servicing fees included in “Revenues - bank” in the consolidated statements of income. A direct write-down is recorded when the recoverability of the valuation allowance is deemed to be unrecoverable. ASB compares the fair value of MSRs to an estimated value calculated by an independent third-party. The third-party relies on both published and unpublished sources of market related assumptions and their own experience and expertise to arrive at a value. ASB uses the third-party value only to assess the reasonableness of its own estimate. Deposit liabilities . Includes only fixed-maturity certificates of deposit beginning in 2018. The fair value of fixed-maturity certificates of deposit was estimated by discounting the future cash flows using the rates currently offered for deposits of similar remaining maturities. Deposit liabilities are classified in Level 2 of the valuation hierarchy. Other borrowings . For advances and repurchase agreements, fair value is estimated using quantitative discounted cash flow models that require the use of interest rate inputs that are currently offered for advances and repurchase agreements of similar remaining maturities. The majority of market inputs are actively quoted and can be validated through external sources including broker market transactions and third party pricing services. Long-term debt-other than bank . Fair value of long-term debt of HEI and the Utilities was obtained from third-party financial services providers based on the current rates offered for debt of the same or similar remaining maturities and from discounting the future cash flows using the current rates offered for debt of the same or similar risks, terms, and remaining maturities. Long-term debt-other than bank is classified in Level 2 of the valuation hierarchy. Interest rate lock commitments (IRLCs) . The estimated fair value of commitments to originate residential mortgage loans for sale is based on quoted prices for similar loans in active markets. IRLCs are classified as Level 2 measurements. Forward sales commitments . To be announced (TBA) mortgage-backed securities forward commitments are classified as Level 1, and consist of publicly-traded debt securities for which identical fair values can be obtained through quoted market prices in active exchange markets. The fair values of ASB’s best efforts and mandatory delivery loan sale commitments are determined using quoted prices in the market place that are observable and are classified as Level 2 measurements. Window forward contracts . The estimated fair value of the Utilities’ window forward contracts was obtained from a third-party financial services provider based on the effective exchange rate offered for the foreign currency denominated transaction. Window forward contracts were classified as Level 2 measurements. As of December 31, 2018 , the Utilities had no outstanding window forward contract as the last contract was paid on December 21, 2018. The following table presents the carrying or notional amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments. For stock in Federal Home Loan Bank, the carrying amount is a reasonable estimate of fair value because it can only be redeemed at par. Estimated fair value (in thousands) Carrying or notional amount Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs Total December 31, 2018 Financial assets HEI consolidated Available-for-sale investment securities $ 1,388,533 $ — $ 1,364,897 $ 23,636 $ 1,388,533 Held-to-maturity investment securities 141,875 — 142,057 — 142,057 Stock in Federal Home Loan Bank 9,958 — 9,958 — 9,958 Loans, net 4,792,707 — 1,809 4,800,244 4,802,053 Mortgage servicing rights 8,062 — — 13,618 13,618 Derivative assets 10,180 — 91 — 91 Financial liabilities HEI consolidated Deposit liabilities 1 827,841 — 817,667 — 817,667 Short-term borrowings—other than bank 73,992 — 73,992 — 73,992 Other bank borrowings 110,040 — 110,037 — 110,037 Long-term debt, net—other than bank 1,879,641 — 1,904,261 — 1,904,261 Derivative liabilities 34,132 34 596 — 630 Hawaiian Electric consolidated Short-term borrowings 25,000 — 25,000 — 25,000 Long-term debt, net 1,418,802 — 1,443,968 — 1,443,968 December 31, 2017 Financial assets HEI consolidated Available-for-sale investment securities $ 1,401,198 $ — $ 1,385,771 $ 15,427 $ 1,401,198 Held-to-maturity investment securities 44,515 — 44,412 — 44,412 Stock in Federal Home Loan Bank 9,706 — 9,706 — 9,706 Loans, net 4,628,381 — 11,254 4,770,497 4,781,751 Mortgage servicing rights 8,639 — — 12,052 12,052 Derivative assets 17,812 — 393 — 393 Hawaiian Electric consolidated Derivative assets-window forward contracts 3,240 — 256 — 256 Financial liabilities HEI consolidated Deposit liabilities 1 5,890,597 — 5,884,071 — 5,884,071 Short-term borrowings—other than bank 117,945 — 117,945 — 117,945 Other bank borrowings 190,859 — 190,829 — 190,829 Long-term debt, net—other than bank 1,683,797 — 1,813,295 — 1,813,295 Derivative liabilities 13,562 20 10 — 30 Hawaiian Electric consolidated Short-term borrowings 4,999 — 4,999 — 4,999 Long-term debt, net 1,368,479 — 1,497,079 — 1,497,079 1 As of December 31, 2018, deposit liabilities include only fixed-maturity certificates of deposit as a result of the Company’s adoption of ASU No. 2016-01 in the first quarter of 2018. As of December 31, 2017, deposit liabilities include noninterest-bearing demand, interest-bearing demand, and savings and money market deposits, for which the carrying amount represents a reasonable estimate of fair value, as such liabilities have no stated maturity. Fair value measurements on a recurring basis. Assets and liabilities measured at fair value on a recurring basis were as follows: December 31 2018 2017 Fair value measurements using Fair value measurements using (in thousands) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Available-for-sale investment securities (bank segment) Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies $ — $ 1,161,416 $ — $ — $ 1,201,473 $ — U.S. Treasury and federal agency obligations — 154,349 — — 184,298 — Corporate bonds — 49,132 — — — — Mortgage revenue bonds — — 23,636 — — 15,427 $ — $ 1,364,897 $ 23,636 $ — $ 1,385,771 $ 15,427 Derivative assets Interest rate lock commitments (bank segment) 1 $ — $ 91 $ — $ — $ 133 $ — Forward commitments (bank segment) 1 — — — — 4 — Window forward contracts (electric utility segment) 2 — — — — 256 — $ — $ 91 $ — $ — $ 393 $ — Derivative liabilities Interest rate lock commitments (bank segment) 1 $ — $ — $ — $ — $ 2 $ — Forward commitments (bank segment) 1 34 9 — 20 8 — Interest rate swap (Other segment) 3 — 587 — — — — $ 34 $ 596 $ — $ 20 $ 10 $ — 1 Derivatives are carried at fair value in other assets or other liabilities in the balance sheets with changes in value included in mortgage banking income. 2 Derivatives were included in regulatory assets and/or liabilities in the balance sheets in 2017. 3 Derivatives are included in Other liabilities in the balance sheets. There were no transfers of financial assets and liabilities between Level 1 and Level 2 of the fair value hierarchy during the years ended December 31, 2018 and 2017 . The changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows: (in thousands) 2018 2017 Mortgage revenue bonds Balance, January 1 $ 15,427 $ 15,427 Principal payments received — — Purchases 8,209 — Unrealized gain (loss) included in other comprehensive income — — Balance, December 31 $ 23,636 $ 15,427 ASB holds two mortgage revenue bonds issued by the Department of Budget and Finance of the State of Hawaii. The Company estimates the fair value by using a discounted cash flow model to calculate the present value of estimated future principal and interest payments. The unobservable input used in the fair value measurement is the weighted average discount rate. As of December 31, 2018 , the weighted average discount rate was 3.96% which was derived by incorporating a credit spread over the one month LIBOR rate. Significant increases (decreases) in the weighted average discount rate could result in a significantly lower (higher) fair value measurement. Fair value measurements on a nonrecurring basis. Certain assets and liabilities are measured at fair value on a nonrecurring basis and therefore are not included in the tables above. These measurements primarily result from assets carried at the lower of cost or fair value or from impairment of individual assets. The carrying value of assets measured at fair value on a nonrecurring basis were as follows: Fair value measurements using (in thousands) Balance Level 1 Level 2 Level 3 December 31, 2018 Loans $ 77 $ — $ — $ 77 Real estate acquired in settlement of loans 186 — — 186 December 31, 2017 Loans 2,621 — — 2,621 For 2018 and 2017 , there were no adjustments to fair value for ASB’s loans held for sale. The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis: Significant unobservable input value (1) (dollars in thousands) Fair value Valuation technique Significant unobservable input Range Weighted December 31, 2018 Home equity line of credit $ 77 Fair value of property or collateral Appraised value less 7% selling cost N/A (2) Total loans $ 77 Real estate acquired in settlement of loans $ 186 Fair value of property or collateral Appraised value less 7% selling cost N/A (2) December 31, 2017 Residential loans $ 613 Fair value of collateral Appraised value less 7% selling cost 71-92% 84% Commercial loans 2,008 Fair value of collateral Appraised value 71-76% 75% Total loans $ 2,621 (1) Represent percent of outstanding principal balance. (2) N/A - Not applicable. There is one asset in each fair value measurement type. Significant increases (decreases) in any of those inputs in isolation would result in significantly higher (lower) fair value measurements.

Termination of proposed merger

Termination of proposed merger and other matters	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Termination of proposed merger and other matters	Note 16 · Termination of proposed merger and other matters On December 3, 2014, HEI, NextEra Energy, Inc. (NEE) and two subsidiaries of NEE entered into an Agreement and Plan of Merger (the Merger Agreement), under which Hawaiian Electric was to become a subsidiary of NEE. The Merger Agreement contemplated that, prior to the Merger, HEI would distribute to its shareholders all of the common stock of ASB Hawaii, Inc. (ASB Hawaii), the parent company of ASB (such distribution referred to as the Spin-Off). The closing of the Merger was subject to various conditions, including receipt of regulatory approval from the PUC. In July 2016: (1) the PUC dismissed the NEE and Hawaiian Electric’s application requesting approval of the proposed Merger, (2) NEE terminated the Merger Agreement, (3) pursuant to the terms of the Merger Agreement, NEE paid HEI a $90 million termination fee and $5 million for the reimbursement of expenses associated with the transaction. In 2016, the Company recognized $60 million of net income ( $2 million of net loss in each of the first and second quarters and $64 million of net income in the third quarter), comprised of the termination fee ( $55 million ), reimbursements of expenses from NEE and insurance ( $3 million ), and additional tax benefits on the previously non-tax-deductible merger- and spin-off-related expenses incurred through June 30, 2016 ( $8 million ), less merger- and spin-off-related expenses incurred in 2016 ( $6 million ) (all net of tax impacts). In May 2016, the Utilities had filed an application for approval of an LNG supply and transport agreement and LNG-related capital equipment, which application was conditioned on the PUC’s approval of the proposed Merger. Subsequently, the Utilities terminated the agreement and withdrew the application. In 2016, Hawaiian Electric recognized expenses related to the terminated LNG agreement of $1 million , net of tax benefits, in each of the first and second quarters.

Quarterly information (unaudite

Quarterly information (unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly information (unaudited)	Note 17 · Quarterly information (unaudited) Selected quarterly information was as follows: Quarters ended Years ended (in thousands, except per share amounts) March 31 June 30 Sept. 30 Dec. 31 December 31 HEI consolidated 2018 Revenues $ 645,874 $ 685,277 $ 768,048 $ 761,650 $ 2,860,849 Operating income 1 71,889 78,799 98,064 84,604 333,356 Net income 40,720 46,527 66,371 50,046 203,664 Net income for common stock 40,247 46,054 65,900 49,573 201,774 Basic earnings per common share 2 0.37 0.42 0.61 0.46 1.85 Diluted earnings per common share 3 0.37 0.42 0.60 0.45 1.85 Dividends per common share 0.31 0.31 0.31 0.31 1.24 2017 4 Revenues $ 591,562 $ 632,281 $ 673,185 $ 658,597 $ 2,555,625 Operating income 1 69,738 77,802 111,473 87,220 346,233 Net income 34,666 39,134 60,544 32,843 167,187 Net income for common stock 34,193 38,661 60,073 32,370 165,297 Basic earnings per common share 2 0.31 0.36 0.55 0.30 1.52 Diluted earnings per common share 3 0.31 0.36 0.55 0.30 1.52 Dividends per common share 0.31 0.31 0.31 0.31 1.24 Hawaiian Electric consolidated 2018 Revenues $ 570,427 $ 608,126 $ 687,409 $ 680,563 $ 2,546,525 Operating income 1 51,369 55,144 74,036 61,112 241,661 Net income 27,974 31,668 50,210 35,796 145,648 Net income for common stock 27,475 31,169 49,712 35,297 143,653 2017 5 Revenues $ 518,611 $ 556,875 $ 598,769 $ 583,311 2,257,566 Operating income 1 50,361 56,482 88,497 68,184 263,524 Net income 21,964 26,143 47,985 25,854 121,946 Net income for common stock 21,465 25,644 47,487 25,355 119,951 Note: HEI owns all of Hawaiian Electric’s common stock, therefore per share data for Hawaiian Electric is not meaningful. 1 The Company and Hawaiian Electric adopted ASU No. 2017-07 in the first quarter of 2018: (1) retrospectively for the presentation in the income statement of the service cost component and the other components of NPPC and NPBC, and (2) prospectively for the capitalization in assets of the service cost component of NPPC and NPBC for Hawaiian Electric and its subsidiaries. See Note 1. 2 The quarterly basic earnings per common share are based upon the weighted-average number of shares of common stock outstanding in each quarter. 3 The quarterly diluted earnings per common share are based upon the weighted-average number of shares of common stock outstanding in each quarter plus the dilutive incremental shares at quarter end. 4 In the fourth quarter of 2017, the Company recorded a $14.2 million adjustment, primarily to reduce deferred tax net asset balances (not accounted for under Utility regulatory ratemaking) to reflect the lower rates enacted by the Tax Act. Also included in this adjustment is $0.7 million (net of tax) of non-executive bonuses paid by ASB related to the enactment of federal tax reform. See below for the impact of the Utilities lower RAM revenues due to the expiration of the 2013 settlement agreement. 5 In the fourth quarter of 2017, Hawaiian Electric consolidated recorded a $9.2 million adjustment to reduce deferred tax net asset balances (not accounted for under regulatory ratemaking) to reflect the lower rates enacted by the Tax Act. In the first five months of 2017, the Utilities recorded lower RAM revenues due to the expiration of the 2013 settlement agreement that allowed the accrual of RAM revenues on January 1 (vs. June 1) for years 2014 to 2016 at Hawaiian Electric. For the first and second quarters of 2017, the Utilities recorded lower revenues of $12 million ( $7 million , net of tax impacts) and $8 million ( $4 million , net of tax impacts) due to this RAM lag, respectively.

SCHEDULE I - CONDENSED FINANCIA

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT	SCHEDULE I — CONDENSED FINANCIAL INFORMATION OF REGISTRANT HAWAIIAN ELECTRIC INDUSTRIES, INC. (PARENT COMPANY) CONDENSED BALANCE SHEETS December 31 2018 2017 (dollars in thousands) Assets Cash and cash equivalents $ 3,742 $ 11,702 Accounts receivable 2,604 2,347 Notes receivable 20,789 — Property, plant and equipment, net 3,456 3,910 Deferred income tax assets 10,147 8,710 Other assets 11,963 15,480 Investments in subsidiaries, at equity 2,605,038 2,466,342 Total assets $ 2,657,739 $ 2,508,491 Liabilities and shareholders’ equity Liabilities Accounts payable $ 2,001 $ 561 Interest payable 3,476 2,319 Notes payable to subsidiaries 34 1,918 Commercial paper 48,992 62,993 Short-term debt, net — 49,953 Long-term debt, net 398,874 249,588 Retirement benefits liability 29,565 31,518 Other 12,517 12,255 Total liabilities 495,459 411,105 Shareholders’ equity Preferred stock, no par value, authorized 10,000,000 shares; issued: none — — Common stock, no par value, authorized 200,000,000 shares; issued and outstanding: 108,879,245 1,669,267 1,662,491 Retained earnings 543,623 476,836 Accumulated other comprehensive loss (50,610 ) (41,941 ) Total shareholders’ equity 2,162,280 2,097,386 Total liabilities and shareholders’ equity $ 2,657,739 $ 2,508,491 SCHEDULE I — CONDENSED FINANCIAL INFORMATION OF REGISTRANT (continued) HAWAIIAN ELECTRIC INDUSTRIES, INC. (PARENT COMPANY) CONDENSED STATEMENTS OF INCOME Years ended December 31 2018 2017 2016 (in thousands) Revenues $ 429 $ 798 $ 647 Equity in net income of subsidiaries 226,972 187,097 199,485 Expenses: Operating, administrative and general 19,515 16,578 17,515 Depreciation of property, plant and equipment 597 548 566 Taxes, other than income taxes 509 496 4,726 Total expenses 20,621 17,622 22,807 Income before merger termination fee, interest expense and income (taxes) benefits 206,780 170,273 177,325 Merger termination fee — — 90,000 Income before interest expense and income (taxes) benefits 206,780 170,273 267,325 Retirement defined benefits expense—other than service costs 674 1,119 1,186 Interest expense 12,664 9,389 9,037 Income before income (taxes) benefits 193,442 159,765 257,102 Income (taxes) benefits 8,332 5,532 (8,846 ) Net income $ 201,774 $ 165,297 $ 248,256 HAWAIIAN ELECTRIC INDUSTRIES, INC. (PARENT COMPANY) STATEMENTS OF COMPREHENSIVE INCOME STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY Incorporated by reference are HEI and Subsidiaries’ Statements of Consolidated Comprehensive Income and Consolidated Statements of Changes in Shareholders’ Equity in Part II, Item 8. SCHEDULE I — CONDENSED FINANCIAL INFORMATION OF REGISTRANT (continued) HAWAIIAN ELECTRIC INDUSTRIES, INC. (PARENT COMPANY) CONDENSED STATEMENTS OF CASH FLOWS Years ended December 31 2018 2017 2016 (in thousands) Net cash provided by operating activities $ 135,470 $ 99,600 $ 191,710 Cash flows from investing activities Increase in note receivable from subsidiary (20,596 ) (70,000 ) — Decrease in note receivable from subsidiary — 66,391 — Capital expenditures (143 ) (317 ) (212 ) Investments in subsidiaries (71,970 ) (22,353 ) (24,000 ) Other 140 (177 ) 1 Net cash used in investing activities (92,569 ) (26,456 ) (24,211 ) Cash flows from financing activities Net increase (decrease) in notes payable to subsidiaries with original maturities of three months or less (30 ) 98 (618 ) Net increase (decrease) in short-term borrowings with original maturities of three months or less (14,000 ) 62,993 (103,063 ) Proceeds from issuance of short-term debt — 125,000 — Repayment of short-term debt (50,000 ) (75,000 ) — Proceeds from issuance of long-term debt 150,000 150,000 75,000 Repayment of long-term debt — (200,000 ) (75,000 ) Withheld shares for employee taxes on vested share-based compensation (996 ) (3,828 ) (2,416 ) Net proceeds from issuance of common stock — — 13,220 Common stock dividends (134,987 ) (134,873 ) (117,274 ) Other (848 ) (756 ) 2,460 Net cash used in financing activities (50,861 ) (76,366 ) (207,691 ) Net decrease in cash and equivalents (7,960 ) (3,222 ) (40,192 ) Cash and cash equivalents, January 1 11,702 14,924 55,116 Cash and cash equivalents, December 31 $ 3,742 $ 11,702 $ 14,924 NOTES TO CONDENSED FINANCIAL INFORMATION Basis of Presentation The “Notes to Consolidated Financial Statements” in Part II, Item 8 should be read in conjunction with the above HEI (Parent Company) financial statements. All HEI subsidiaries are reflected in the Condensed Financial Statements under the equity method. Income taxes for equity method investments are included in “Equity in net income of subsidiaries.” The Condensed Statements of Income Data reflects the retrospective application of ASU No. 2017-07, “Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” which was adopted in the first quarter of 2018. Nonservice cost was reclassified from “Operating, general and administrative expenses” to “Retirement defined benefits expense—other than service costs.” Long-term debt The components of long-term debt, net, were as follows: December 31 2018 2017 (dollars in thousands) HEI 2.99% term loan, due 2022 $ 150,000 $ 150,000 HEI 5.67% senior note, due 2021 50,000 50,000 HEI 3.99% senior note, due 2023 50,000 50,000 HEI 4.58% senior notes, due 2025 50,000 — HEI 4.72% senior notes, due 2028 100,000 — Less unamortized debt issuance costs (1,126 ) (412 ) Long-term debt, net $ 398,874 $ 249,588 The aggregate payments of principal required within five years after December 31, 2018 on long-term debt are nil in 2019 and 2020, $50 million in 2021 , $150 million in 2022 and $50 million in 2023 . Indemnities As of December 31, 2018 , HEI has a General Agreement of Indemnity in favor of both Liberty Mutual Insurance Company (Liberty) and Travelers Casualty and Surety Company of America (Travelers) for losses in connection with any and all bonds, undertakings or instruments of guarantee and any renewals or extensions thereof executed by Liberty or Travelers, including, but not limited to, a $0.6 million self-insured United States Longshore & Harbor bond and a $0.7 million self-insured automobile bond. Income taxes The Company’s financial reporting policy for income tax allocations is based upon a separate entity concept whereby each subsidiary provides income tax expense (or benefits) as if each were a separate taxable entity. The difference between the aggregate separate tax return income tax provisions and the consolidated financial reporting income tax provision is charged or credited to HEI’s separate tax provision. Dividends from HEI subsidiaries In 2018 , 2017 and 2016 , cash dividends received from subsidiaries were $154 million , $125 million and $130 million , respectively. Supplemental disclosures of noncash activities In 2018 , 2017 and 2016 , $2.3 million , $2.8 million and $2.3 million , respectively, of HEI accounts receivable from ASB Hawaii were reduced with a corresponding reduction in HEI notes payable to ASB Hawaii in noncash transactions. In 2018 , 2017 and 2016 , $2.3 million , $2.8 million and $2.3 million , respectively, were contributed as equity by HEI into ASB Hawaii with a corresponding increase in HEI notes payable to ASB Hawaii in noncash transactions. In 2017 , $3.6 million of HEI notes receivable from Hamakua Energy, LLC were converted to equity in a noncash transaction. Under the HEI DRIP, common stock dividends reinvested by shareholders in HEI common stock in noncash transactions amounted to nil , nil and $17 million in 2018 , 2017 and 2016 , respectively. From January 1, 2016 through January 6, 2016 and December 7, 2016 to date, HEI satisfied the share purchase requirements of the DRIP through open market purchases of its common stock rather than new issuances.

SCHEDULE II - VALUATION AND QUA

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS	SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS Years ended December 31, 2018 , 2017 and 2016 Col. A Col. B Col. C Col. D Col. E (in thousands) Additions Description Balance at begin- ning of period Charged to costs and expenses Charged to other accounts Deductions Balance at end of period 2018 Allowance for uncollectible accounts – electric utility $ 1,178 $ 2,474 $ (4,099 ) (a), (c) $ (1,927 ) (b),(c) $ 1,480 Allowance for uncollectible interest – bank $ 367 $ — $ 6 $ — $ 373 Allowance for losses for loans – bank $ 53,637 $ 14,745 (d) $ 4,254 (a) $ 20,517 (b) $ 52,119 2017 Allowance for uncollectible accounts – electric utility $ 1,121 $ 1,810 $ 785 (a) $ 2,538 (b),(c) $ 1,178 Allowance for uncollectible interest – bank $ 1,834 $ — $ — $ 1,467 $ 367 Allowance for losses for loans – bank $ 55,533 $ 10,901 (d) $ 4,016 (a) $ 16,813 (b) $ 53,637 Deferred tax valuation allowance – HEI $ 38 $ — $ — $ 38 $ — 2016 Allowance for uncollectible accounts – electric utility $ 1,699 $ 2,383 $ 877 (a) $ 3,838 (b),(c) $ 1,121 Allowance for uncollectible interest – bank $ 1,679 $ — $ 155 $ — $ 1,834 Allowance for losses for loans – bank $ 50,038 $ 16,763 (d) $ 2,977 (a) $ 14,245 (b) $ 55,533 Deferred tax valuation allowance – HEI $ 54 $ — $ — $ 16 $ 38 (a) Primarily recoveries. (b) Bad debts charged off. (c) Reclass (reversal) of allowance for one customer account into other long term assets in 2018, 2017 and 2016 were $(4,934) , $841 , and $1,790 , respectively. (d) Represents provision for loan loss.

Summary of significant accoun_2

Summary of significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of presentation	In preparing the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (GAAP), management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses. Actual results could differ significantly from those estimates.
Use of estimates	Material estimates that are particularly susceptible to significant change for HEI and its subsidiaries (collectively, the Company) include the amounts reported for investment securities (ASB only); property, plant and equipment; pension and other postretirement benefit obligations; contingencies and litigation; income taxes; regulatory assets and liabilities (Utilities only); electric utility unbilled revenues (Utilities only); and allowance for loan losses (ASB only).
Consolidation	The HEI consolidated financial statements include the accounts of HEI and its subsidiaries. The Hawaiian Electric consolidated financial statements include the accounts of Hawaiian Electric and its subsidiaries, except for HECO Capital Trust III (Trust III), which is accounted for under the equity method because Hawaiian Electric does not have a controlling financial interest or variable interest in Trust III, but has the ability to exercise significant influence. When HEI or Hawaiian Electric has a controlling financial interest in another entity (usually, majority voting interest), that entity is consolidated. Investments in companies over which the Company or the Utilities have the ability to exercise significant influence, but not control, are accounted for using the equity method. The consolidated financial statements exclude variable interest entities (VIEs) when the Company or the Utilities are not the primary beneficiaries. See Note 3 for information regarding Trust III unconsolidated VIEs. In general, intercompany amounts are eliminated in consolidation
Cash and cash equivalents	The Utilities consider cash on hand, deposits in banks, money market accounts, certificates of deposit, short-term commercial paper of non-affiliates and liquid investments (with original maturities of three months or less) to be cash and cash equivalents. The Company considers the same items to be cash and cash equivalents as well as ASB’s deposits with the Federal Home Loan Bank (FHLB), federal funds sold (excess funds that ASB loans to other banks overnight at the federal funds rate) and securities purchased under resale agreements.
Property, plant and equipment	Property, plant and equipment are reported at cost. Self-constructed electric utility plant includes engineering, supervision, administrative and general costs and an allowance for the cost of funds used during the construction period. These costs are recorded in construction in progress and are transferred to utility plant when construction is completed and the facilities are either placed in service or become useful for public utility purposes. Costs for betterments that make utility plant more useful, more efficient, of greater durability or of greater capacity are also capitalized. Upon the retirement or sale of electric utility plant, generally no gain or loss is recognized. The cost of the plant retired is charged to accumulated depreciation. Amounts collected from customers for cost of removal are included in regulatory liabilities.
Depreciation	Depreciation is computed primarily using the straight-line method over the estimated lives of the assets being depreciated. Electric utility plant additions in the current year are depreciated beginning January 1 of the following year in accordance with rate-making. Electric utility plant has lives ranging from 16 to 88 years for production plant, from 10 to 79 years for transmission and distribution plant and from 5 to 65 years for general plant.
Leases	HEI, the Utilities and ASB have entered into lease agreements for the use of equipment and office space. The provisions of some of the lease agreements contain renewal options.
Retirement benefits	Pension and other postretirement benefit costs are charged primarily to expense and electric utility plant (in the case of the Utilities). Funding for the Company’s qualified pension plans (Plans) is based on actuarial assumptions adopted by the Pension Investment Committee administering the Plans. The participating employers contribute amounts to a master pension trust for the Plans in accordance with the funding requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA), including changes promulgated by the Pension Protection Act of 2006, and considering the deductibility of contributions under the Internal Revenue Code. The Company generally funds at least the net periodic pension cost during the year, subject to limits and targeted funded status. Under a pension tracking mechanism approved by the Public Utilities Commission of the State of Hawaii (PUC), the Utilities generally will make contributions to the pension fund at the greater of the minimum level required under the law or net periodic pension cost. Certain health care and/or life insurance benefits are provided to eligible retired employees and the employees’ beneficiaries and covered dependents. The Company generally funds the net periodic postretirement benefit costs other than pensions (except for executive life) for postretirement benefits other than pensions (OPEB), while maximizing the use of the most tax-advantaged funding vehicles, subject to cash flow requirements and reviews of the funded status with the consulting actuary. The Utilities must fund OPEB costs as specified in the OPEB tracking mechanisms, which were approved by the PUC. Future decisions in rate cases could further impact funding amounts.
Environmental expenditures	The Company and the Utilities are subject to numerous federal and state environmental statutes and regulations. In general, environmental contamination treatment costs are charged to expense. Environmental costs are capitalized if the costs extend the life, increase the capacity, or improve the safety or efficiency of property; the costs mitigate or prevent future environmental contamination; or the costs are incurred in preparing the property for sale. Environmental costs are either capitalized or charged to expense when environmental assessments and/or remedial efforts are probable and the cost can be reasonably estimated. The Utilities review their sites and measure the liability quarterly by assessing a range of reasonably likely costs of each identified site using currently available information, including existing technology, presently enacted laws and regulations, experience gained at similar sites, and the probable level of involvement and financial condition of other potentially responsible parties.
Income taxes	Deferred income tax assets and liabilities are established for the temporary differences between the financial reporting bases and the tax bases of the Company’s and the Utilities’ assets and liabilities at federal and state tax rates expected to be in effect when such deferred tax assets or liabilities are realized or settled. As a result of the 2017 Tax Cuts and Jobs Act (Tax Act), the accumulated deferred income tax balances (ADIT) were adjusted in 2017 for the lower federal income tax rate expected to be in effect when the deferred tax assets or liabilities are realized or settled. See further discussion under “Recent tax developments” in Note 11 . The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount expected to be realized. HEI and the Utilities’ investment tax credits are deferred and amortized over the estimated useful lives of the properties to which the credits relate (and for the Utilities, this treatment is in accordance with Accounting Standards Codification (ASC) Topic 980, “Regulated Operations”). The Utilities are included in the consolidated income tax returns of HEI. However, income tax expense has been computed for financial statement purposes as if each utility filed a separate income tax return and Hawaiian Electric filed a consolidated Hawaiian Electric income tax return. Governmental tax authorities could challenge a tax return position taken by the Company. The Company and the Utilities use a “more-likely-than-not” recognition threshold and measurement standard for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return.
Fair value measurements	Fair value estimates are estimates of the price that would be received to sell an asset, or paid upon the transfer of a liability, in an orderly transaction between market participants at the measurement date. The fair value estimates are generally determined based on assumptions that market participants would use in pricing the asset or liability and are based on market data obtained from independent sources. However, in certain cases, the Company and the Utilities use their own assumptions about market participant assumptions based on the best information available in the circumstances. These valuations are estimates at a specific point in time, based on relevant market information, information about the financial instrument and judgments regarding future expected loss experience, economic conditions, risk characteristics of various financial instruments and other factors. These estimates do not reflect any premium or discount that could result if the Company or the Utilities were to sell its entire holdings of a particular financial instrument at one time. Because no active trading market exists for a portion of the Company’s and the Utilities’ financial instruments, fair value estimates cannot be determined with precision. Changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the estimates. In addition, the tax ramifications related to the realization of the unrealized gains and losses could have a significant effect on fair value estimates, but have not been considered in making such estimates. The Company and the Utilities group their financial assets measured at fair value in three levels outlined as follows: Level 1: Inputs to the valuation methodology are quoted prices, unadjusted, for identical assets or liabilities in active markets. A quoted price in an active market provides the most reliable evidence of fair value and is used to measure fair value whenever available. Level 2: Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets; inputs to the valuation methodology include quoted prices for identical or similar assets or liabilities in markets that are not active; or inputs to the valuation methodology that are derived principally from or can be corroborated by observable market data by correlation or other means. Level 3: Inputs to the valuation methodology are unobservable and significant to the fair value measurement. Level 3 assets and liabilities include financial instruments whose value is determined using discounted cash flow methodologies, as well as instruments for which the determination of fair value requires significant management judgment or estimation. Classification in the hierarchy is based upon the lowest level input that is significant to the fair value measurement of the asset or liability. For instruments classified in Level 1 and 2 where inputs are primarily based upon observable market data, there is less judgment applied in arriving at the fair value. For instruments classified in Level 3, management judgment is more significant due to the lack of observable market data. Fair value is also used on a nonrecurring basis to evaluate certain assets for impairment or for disclosure purposes. Examples of nonrecurring uses of fair value include mortgage servicing rights accounted for by the amortization method, loan impairments for certain loans, real estate acquired in settlement of loans, goodwill and asset retirement obligations (AROs).
Earnings per share (HEI only)	Basic earnings per share (EPS) is computed by dividing net income for common stock by the weighted-average number of common shares outstanding for the period. Diluted EPS is computed similarly, except that dilutive common shares for stock compensation and the equity forward transactions are added to the denominator.
Impairment of long-lived assets and long-lived assets to be disposed of	The Company and the Utilities review long-lived assets and certain identifiable intangibles for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less costs to sell.
Recent accounting pronouncements	Revenues from contracts with customers . In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606).” The core principle of the guidance in ASU No. 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU No. 2014-09 also requires disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The Company and Hawaiian Electric adopted ASU No. 2014-09 (and subsequently issued revenue-related ASUs, as applicable) in the first quarter of 2018. There was no cumulative effect adjustment and no impact on the timing or pattern of revenue recognition, but ASU No. 2014-09 required changes with respect to the Company’s and Hawaiian Electric’s revenue disclosures. See Note 8 . Financial instruments . In January 2016, the FASB issued ASU No. 2016-01, “Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities,” which, among other things: • Requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. • Requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. • Requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables). • Eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost. The Company adopted ASU No. 2016-01 in the first quarter of 2018 and the impact of adoption was not material to the Company’s and Hawaiian Electric’s consolidated financial statements. Cash flows . In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments,” which provides guidance on eight specific cash flow issues - debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies), distributions received from equity method investees, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. The Company adopted ASU No. 2016-15 in the first quarter of 2018 using a retrospective transition method and there was no impact from the adoption to the Company’s and Hawaiian Electric’s consolidated statements of cash flows. Restricted cash . In November 2016, the FASB issued ASU No. 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash,” which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The Company adopted ASU No. 2016-18 in the first quarter of 2018 using a retrospective transition method and the impact of adoption was not material to the Company’s and Hawaiian Electric’s consolidated statements of cash flows. Definition of a Business . In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations-Clarifying the Definition of a Business.” This update clarifies the definition of a business and adds guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted ASU No. 2017-01 in the first quarter of 2018 and the impact of adoption was not material to the Company’s and Hawaiian Electric’s consolidated financial statements. Net periodic pension cost and net periodic postretirement benefit cost . In March 2017, the FASB issued ASU No. 2017-07, “Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” which requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. It also requires the other components of net periodic pension cost (NPPC) and net periodic postretirement benefit cost (NPBC) as defined in paragraphs 715-30-35-4 and 715-60-35-9 to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. Additionally, only the service cost component is eligible for capitalization under GAAP, when applicable. The Company adopted ASU No. 2017-07 in the first quarter of 2018: (1) retrospectively for the presentation in the income statement of the service cost component and the other components of NPPC and NPBC, and (2) prospectively for the capitalization in assets of the service cost component of NPPC and NPBC for Hawaiian Electric and its subsidiaries. HEI and ASB do not capitalize pension and OPEB costs. The Company and Hawaiian Electric elected the practical expedient that permits an entity to use the amounts disclosed in its pension and other postretirement benefit plan note for the prior comparative periods as the estimation basis for applying the retrospective presentation requirements. The PUC approved in the Utilities’ rate cases, stipulated agreements to defer non-service cost components of NPPC and NPBC, which would have been capitalized prior to ASU No. 2017-07, as part of each utility’s pension tracking mechanisms. Such treatment is effective starting in 2018 and continues until each utility’s next rate case. In each utility’s next rate case, rates established would include recovery of the deferred non-service cost components and the Utilities’ will seek approval to capitalize only the service components of NPPC and NPBC going forward, which reflects the requirements of ASU No.2017-07. The adoption of ASU 2017-07 in the first quarter of 2018 did not have an impact on 2018 net income. The following table summarizes the impact to the prior period financial statements of the adoption of ASU No. 2017-07: 2017 2016 (in thousands) As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported HEI Consolidated Statements of Income Expenses Electric utility $ 2,000,045 $ (6,003 ) $ 1,994,042 $ 1,809,900 $ (5,602 ) $ 1,804,298 Bank 198,924 (820 ) 198,104 198,572 (875 ) 197,697 Other 18,365 (1,119 ) 17,246 24,007 (1,186 ) 22,821 Total expenses $ 2,217,334 $ (7,942 ) $ 2,209,392 $ 2,032,479 $ (7,663 ) $ 2,024,816 Operating income Electric utility $ 257,521 $ 6,003 $ 263,524 $ 284,468 $ 5,602 $ 290,070 Bank 98,716 820 99,536 87,352 875 88,227 Other (17,946 ) 1,119 (16,827 ) (23,645 ) 1,186 (22,459 ) Total operating income $ 338,291 $ 7,942 $ 346,233 $ 348,175 $ 7,663 $ 355,838 Retirement defined benefits expense--other than service costs $ — $ (7,942 ) $ (7,942 ) $ — $ (7,663 ) $ (7,663 ) Hawaiian Electric Consolidated Statements of Income Other operation and maintenance $ 417,910 $ (6,003 ) $ 411,907 $ 405,533 $ (5,602 ) $ 399,931 Total expense 2,000,045 (6,003 ) 1,994,042 1,809,900 (5,602 ) 1,804,298 Operating income 257,521 6,003 263,524 284,468 5,602 290,070 Retirement defined benefits expense--other than service costs — (6,003 ) (6,003 ) — (5,602 ) (5,602 ) Hawaiian Electric Consolidating Statements of Income (in Note 3) Hawaiian Electric (parent only) Other operation and maintenance 279,440 (5,049 ) 274,391 273,176 (5,058 ) 268,118 Total expense 1,425,655 (5,049 ) 1,420,606 1,277,245 (5,058 ) 1,272,187 Operating income 172,849 5,049 177,898 197,139 5,058 202,197 Retirement defined benefits expense--other than service costs — (5,049 ) (5,049 ) — (5,058 ) (5,058 ) 2017 2016 (in thousands) As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported Hawaiian Electric Consolidating Statements of Income (in Note 3) Hawaii Electric Light Other operation and maintenance $ 66,277 $ (93 ) $ 66,184 $ 63,897 $ 319 $ 64,216 Total expense 287,868 (93 ) 287,775 266,823 319 267,142 Operating income 45,599 93 45,692 44,562 (319 ) 44,243 Retirement defined benefits expense--other than service costs — (93 ) (93 ) — 319 319 Maui Electric Other operation and maintenance 72,193 (861 ) 71,332 68,460 (863 ) 67,597 Total expense 286,522 (861 ) 285,661 265,832 (863 ) 264,969 Operating income 39,156 861 40,017 42,873 863 43,736 Retirement defined benefits expense--other than service costs — (861 ) (861 ) — (863 ) (863 ) ASB Statements of Income Data (in Note 4) Compensation and employee benefits 95,751 (820 ) 94,931 90,117 (875 ) 89,242 Other expense 19,324 820 20,144 18,487 875 19,362 Derivatives and Hedging. In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” which is intended to improve and simplify accounting rules around hedge accounting. The amendments in ASU No. 2017-12 improve the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results in the financial statements. The amendments also expand and refine hedge accounting for both nonfinancial and financial risk components and align the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. For public business entities, the new guidance is effective for annual periods beginning after December 15, 2018, including interim periods within those annual periods, but early adoption is permitted. The Company early adopted ASU No. 2017-12 in the second quarter of 2018, with an effective date of April 1, 2018, and the adoption did not have a material impact on the Company’s consolidated financial statements. Leases . In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842),” which requires that lessees recognize a liability to make lease payments (the lease liability) and a right-of-use (ROU) asset, representing its right to use the underlying asset for the lease term, for all leases (except short-term leases) at the commencement date. For finance leases, a lessee is required to recognize interest on the lease liability separately from amortization of the ROU asset in the consolidated statements of income. For operating leases, a lessee is required to recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis. The Company adopted ASU No. 2016-02 on January 1, 2019 and used the effective date as the date of initial application. Consequently, financial information for dates and periods before January 1, 2019 will not be updated and the disclosures required under the new standard will not be provided (i.e., the Company will continue to report comparative periods presented in the financial statements in the period of adoption under ASC 840, including the required disclosures under ASC 840). The new standard provides a number of optional practical expedients in transition. The Company has elected the practical expedient package under which the Company will not have to reassess its prior conclusions about whether any expired or existing contracts are or contain leases, whether there is a change in lease classification for any expired or existing leases under the new standard, or whether there were initial direct costs for any existing leases that would be treated differently under the new standard. The most significant effect of the new standard relates to the recognition of new ROU assets and lease liabilities on the Company’s balance sheet for purchase power agreements and real estate operating leases. On adoption, the Company recognized additional lease liabilities of approximately $257 million for the Company and approximately $236 million for the Utilities ( $215 million related to PPAs), with corresponding ROU assets of the same amount based on the present value of the remaining minimum rental payments under current leasing standards for existing operating leases. The new standard also provides practical expedients for an entity’s ongoing accounting. The Company has elected the short-term lease recognition exemption for all of its leases that qualify, which means the Company will not recognize lease liabilities and ROU assets for all leases that have lease terms that are 12 months or less. The Company has elected the practical expedient to not separate lease and non-lease components for its real estate leases. The Utilities also elected the practical expedient to not assess all existing land easements that were not previously accounted for in accordance with ASC 840. Credit losses . In June 2016, the FASB issued ASU No. 2016-13, “ Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ,” which is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations . ASU No. 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date (based on historical experience, current conditions and reasonable and supportable forecasts) and enhanced disclosures to help financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. In addition, ASU No. 2016-13 amends the accounting for credit losses on available-for-sale (AFS) debt securities and purchased financial assets with credit deterioration. The other-than-temporary impairment model of accounting for credit losses on AFS debt securities will be replaced with an estimate of expected credit losses only when the fair value is below the amortized cost of the asset. The length of time the fair value of an AFS debt security has been below the amortized cost will no longer impact the determination of whether a credit loss exists. The AFS debt security model will also require the use of an allowance to record the estimated losses (and subsequent recoveries). The accounting for the initial recognition of the estimated expected credit losses for purchased financial assets with credit deterioration would be recognized through an allowance for credit losses with an offset to the cost basis of the related financial asset at acquisition (i.e., there is no impact to net income at initial recognition). The Company plans to adopt ASU No. 2016-13 in the first quarter of 2020. The guidance is to be applied on a modified retrospective basis with the cumulative effect of initially applying the amendments recognized in retained earnings at the date of initial application. The Company has assembled a project team that meets regularly to evaluate the provisions of this ASU, identify additional data requirements necessary and determine an approach for implementation. The team has assigned roles and responsibilities and developed key tasks to complete and a general timeline to be followed. The Company is evaluating the effect that this ASU will have on the consolidated financial statements and disclosures. Economic conditions and the composition of the Company’s loan portfolio at the time of adoption will influence the extent of the adopting accounting adjustment. Compensation-retirement benefits-defined benefit plans . In August 2018, the FASB issued ASU 2018-14, “Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans,” which makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. The new guidance eliminates requirements for certain disclosures that are no longer considered cost beneficial and requires new ones that the FASB considers pertinent. ASU No. 2018-14 is effective for fiscal years ending after December 15, 2020 . The Company is evaluating the impact of the adoption of ASU No. 2018-14 on its financial statement disclosures, but does not expect it to have a material impact.
Electric utility
Regulation by the Public Utilities Commission of the State of Hawaii (PUC)	The Utilities are regulated by the PUC and account for the effects of regulation under FASB ASC Topic 980, “Regulated Operations.” As a result, the Utilities’ financial statements reflect assets, liabilities, revenues and expenses based on current cost-based rate-making regulations (see Note 3—“Regulatory assets and liabilities.” Their continued accounting under ASC Topic 980 generally requires that rates are established by an independent, third-party regulator; rates are designed to recover the costs of providing service; and it is reasonable to assume that rates can be charged to, and collected from, customers. The rate schedules of the Utilities include energy cost adjustment clauses (ECACs) and energy costs recovery clauses (ECRCs) under which electric rates are adjusted for changes in the weighted-average price paid for fuel oil and certain components of purchased power, and the relative amounts of company-generated power and purchased power. The rate schedules also include purchased power adjustment clauses (PPACs) under which the remaining purchase power expenses are recovered through surcharge mechanisms. The amounts collected through the ECAC/ECRCs and PPACs are required to be reconciled quarterly.
Accounts receivable	Accounts receivable are recorded at the invoiced amount. The Utilities generally assess a late payment charge on balances unpaid from the previous month. The allowance for doubtful accounts is the Utilities’ best estimate of the amount of probable credit losses in the Utilities existing accounts receivable.
Contributions in aid of construction	The Utilities receive contributions from customers for special construction requirements. As directed by the PUC, contributions are amortized on a straight-line basis over 30 to 55 years as an offset against depreciation expense. The carrying value of CIAC is included in property, plant and equipment, net.
Electric utility revenues	Revenues related to electric service are generally recorded when service is rendered and include revenues applicable to energy consumed in the accounting period but not yet billed to the customers. The Utilities also record revenue under a decoupling mechanism.
Repairs and maintenance costs	Repairs and maintenance costs for overhauls of generating units are generally expensed as they are incurred.
Allowance for funds used during construction (AFUDC)	AFUDC is an accounting practice whereby the costs of debt and equity funds used to finance plant construction are credited on the statement of income and charged to construction in progress on the balance sheet. If a project under construction is delayed for an extended period of time, AFUDC on the delayed project may be stopped after assessing the causes of the delay and probability of recovery.
Bank
Investment securities	Investments in debt securities are classified as held-to-maturity (HTM), trading or available-for-sale (AFS). ASB determines the appropriate classification at the time of purchase. Debt securities that ASB intends to and has the ability to hold to maturity are classified as HTM securities and reported at amortized cost. Marketable debt securities that are bought and held principally for the purpose of selling them in the near term are classified as trading securities and reported at fair value, with unrealized gains and losses included in earnings. Marketable debt securities not classified as either HTM or trading securities are classified as AFS and reported at fair value. Unrealized gains and losses for AFS securities are excluded from earnings and reported on a net basis in accumulated other comprehensive income (AOCI) until realized. Interest income is recorded on an accrual basis. Discounts and premiums on securities are accreted or amortized into interest income using the interest method over the remaining contractual lives of the agency obligation securities and the estimated lives of the mortgage-backed securities adjusted for anticipated prepayments. ASB uses actual prepayment experience and estimates of future prepayments to determine the constant effective yield necessary to apply the interest method of income recognition. The discounts and premiums on the agency obligations portfolio are accreted or amortized on a prospective basis using expected contractual cash flows. The discounts and premiums on the mortgage-backed securities portfolio are accreted or amortized on a retrospective basis using changes in anticipated prepayments. This method requires a retrospective adjustment of the effective yield each time ASB changes the estimated life as if the new estimate had been known since the original acquisition date of the securities. Estimates of future prepayments are based on the underlying collateral characteristics and historic or projected prepayment behavior of each security. The specific identification method is used in determining realized gains and losses on the sales of securities. For securities that are not trading securities, individual securities are assessed for impairment at least on a quarterly basis, and more frequently when economic or market conditions warrant. A security is impaired if the fair value of the security is less than its carrying value at the financial statement date. When a security is impaired, ASB determines whether this impairment is temporary or other-than-temporary. If ASB does not expect to recover the entire amortized cost basis of the security or there is a change in the expected cash flows, an OTTI exists. If ASB intends to sell the security, or will more likely than not be required to sell the security before recovery of its amortized cost, the OTTI must be recognized in earnings. If ASB does not intend to sell the security, and it is not more likely than not that ASB will be required to sell the security before recovery of its amortized cost, the OTTI must be separated into the amount representing the credit loss and the amount related to all other factors. The amount of OTTI related to the credit loss is recognized in earnings, while the remaining OTTI is recognized in AOCI. Based on ASB’s evaluation as of December 31, 2018 , 2017 and 2016 , there was no indicated impairment as the bank expects to collect the contractual cash flows for these investments. Stock in Federal Home Loan Bank (FHLB) is carried at cost and is reviewed at least quarterly for impairment, with valuation adjustments recognized in noninterest income.
Loans	ASB carries loans at amortized cost less the allowance for loan losses, loan origination fees (net of direct loan origination costs), commitment fees and purchase premiums and discounts. Interest on loans is credited to income as it is earned. Discounts and premiums are accreted or amortized over the life of the loans using the interest method. Loan origination fees (net of direct loan origination costs) are deferred and recognized as an adjustment in yield over periods not exceeding the contractual life of the loan using the interest method or taken into income when the loan is paid off or sold. Nonrefundable commitment fees (net of direct loan origination costs, if applicable) received for commitments to originate or purchase loans are deferred and, if the commitment is exercised, recognized as an adjustment of yield over the life of the loan using the interest method. Nonrefundable commitment fees received for which the commitment expires unexercised are recognized as income upon expiration of the commitment.
Loans held for sale, gain on sale of loans, and mortgage servicing assets and liabilities	Loans held for sale are stated at the lower of cost or estimated fair value on an aggregate basis. Premiums, discounts and net deferred loan fees are not amortized while a loan is classified as held for sale. A sale is recognized only when the consideration received is other than beneficial interests in the assets sold and control over the assets is transferred irrevocably to the buyer. Gains or losses on sales of loans are recognized at the time of sale and are determined by the difference between the net sales proceeds and the allocated basis of the loans sold.
Allowance for loan losses	ASB maintains an allowance for loan losses to absorb losses inherent in its loan portfolio. The level of allowance for loan losses is based on a continuing assessment of existing risks in the loan portfolio, historical loss experience, changes in collateral values and current conditions (e.g., economic conditions, real estate market conditions and interest rate environment). The allowance for loan losses is allocated to loan types using both a formula-based approach applied to groups of loans and an analysis of certain individual loans for impairment. The formula-based approach emphasizes loss factors primarily derived from actual historical default and loss rates, which are combined with an assessment of certain qualitative factors to determine the allowance amounts allocated to the various loan categories. Adverse changes in any of these factors could result in higher charge-offs and provision for loan losses. ASB disaggregates its portfolio loans into portfolio segments for purposes of determining the allowance for loan losses. Commercial, commercial real estate, and commercial construction loans are defined as non-homogeneous loans and ASB utilizes a risk rating system for evaluating the credit quality of the loans. Non-homogeneous loans are also categorized into the regulatory asset quality classifications-Pass, Special Mention, Substandard, Doubtful, and Loss based on credit quality. ASB utilizes a numerical-based, risk rating “PD Model” that takes into consideration fiscal year-end financial information of the borrower and identified financial attributes including retained earnings, operating cash flows, interest coverage, liquidity and leverage that demonstrate a strong correlation with default to assign default probabilities at the borrower level. In addition, a loss given default (LGD) value is assigned to each loan to measure loss in the event of default based on loan specific features such as collateral that mitigates the amount of loss in the event of default. Residential, consumer and credit scored business loans are considered homogeneous loans, which are typically underwritten based on common, uniform standards. For the homogeneous portfolio, the quality of the loan is best indicated by the repayment performance of an individual borrower. ASB supplements performance data with external credit bureau data and credit scores such as the Fair Isaac Corporation (FICO) score on a quarterly basis. ASB has built portfolio loss models for each major segment based on the combination of internal and external data to predict the probability of default at the loan level. ASB also considers qualitative factors in determining the allowance for loan losses. These include but are not limited to adjustments for changes in policies and procedures in underwriting, monitoring or collections, economic conditions, portfolio mix, lending and risk management personnel, results of internal audit and quality control reviews, collateral values and any concentrations of credit. The reserve for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to unfunded credit facilities and is included in accounts payable and other liabilities in the consolidated balance sheets. The determination of the adequacy of the reserve is based upon an evaluation of the unfunded credit facilities, including an assessment of historical commitment utilization experience, credit risk grading and historical loss rates. This process takes into consideration the same risk elements that are analyzed in the determination of the adequacy of the allowance for loan losses, as discussed above. Net adjustments to the reserve for unfunded commitments are included in other noninterest expense in the consolidated statements of income. The allowance for loan losses is based on currently available information and historical experience, and future adjustments may be required from time to time to the allowance for loan losses based on new information and changes that occur (e.g., due to changes in economic conditions, particularly in Hawaii). Actual losses could differ from management’s estimates, and these differences and subsequent adjustments could be material.
Nonperforming loans	Loans are generally placed on nonaccrual status when contractually past due 90 days or more, or earlier if the probability of collection is insufficient to warrant further accrual. All interest that is accrued but not collected is reversed. A loan may be returned to accrual status if (i) principal and interest payments have been brought current and repayment of the remaining contractual principal and interest is expected to be made, (ii) the loan has otherwise become well-secured and in the process of collection, or (iii) the borrower has been making regularly scheduled payments in full for the prior six months and it is reasonably assured that the loan will be brought fully current within a reasonable period. Cash receipts on nonaccruing loans are generally applied to reduce the unpaid principal balance. Loans considered to be uncollectible are charged-off against the allowance for loan losses. The amount and timing of charge-offs on loans includes consideration of the loan type, length of delinquency, insufficiency of collateral value, lien priority and the overall financial condition of the borrower. Recoveries on loans previously charged-off are credited back to the allowance for loan losses. Loans that have been charged-off against the allowance for loan losses are periodically monitored to evaluate whether further adjustments to the allowance are necessary. Loans in the commercial and commercial real estate portfolio are charged-off when the loan is risk rated “Doubtful” or “Loss.” The loan or a portion thereof is determined to be uncollectible after considering the borrower’s overall financial condition and collateral deficiency. A commercial or commercial real estate loan is considered uncollectible when: (a) the borrower is delinquent in principal or interest 90 days or more; (b) significant improvement in the borrower’s repayment capacity is doubtful; and/or (c) collateral value is insufficient to cover outstanding indebtedness and no other viable assets or repayment sources exist. Loans in the residential mortgage and home equity portfolios are charged-off when the loan or a portion thereof is determined to be uncollectible after considering the borrower’s overall financial condition and collateral deficiency. Such loan is considered uncollectible when: (a) the borrower is delinquent in principal or interest 180 days or more; (b) it is probable that collateral value is insufficient to cover outstanding indebtedness and no other viable assets or repayment sources exist; (c) notification of the borrower’s bankruptcy is received or the borrower’s debt is discharged in bankruptcy and the loan is not reaffirmed; or (d) in cases where ASB is in a subordinate position to other debt, the senior lien holder has foreclosed and ASB’s junior lien is extinguished. Other consumer loans are generally charged-off when the balance becomes 120 days delinquent.
Loans modified in a troubled debt restructuring	Loans are considered to have been modified in a troubled debt restructuring (TDR) when, due to a borrower’s financial difficulties, ASB makes concessions to the borrower that it would not otherwise consider for a non-troubled borrower. Modifications may include interest rate reductions, interest only payments for an extended period of time, protracted terms such as amortization and maturity beyond the customary length of time found in the normal market place, and other actions intended to minimize economic loss and to provide alternatives to foreclosure or repossession of collateral. Generally, a nonaccrual loan that has been modified in a TDR remains on nonaccrual status until the borrower has demonstrated sustained repayment performance for a period of six consecutive months. However, performance prior to the modification, or significant events that coincide with the modification, are included in assessing whether the borrower can meet the new terms and may result in the loan being returned to accrual status at the time of loan modification or after a shorter performance period. If the borrower’s ability to meet the revised payment schedule is uncertain, or there is reasonable doubt over the full collectability of principal and interest, the loan remains on nonaccrual status.
Real estate acquired in settlement of loans	ASB records real estate acquired in settlement of loans at fair value, less estimated selling expenses. ASB obtains appraisals based on recent comparable sales to assist management in estimating the fair value of real estate acquired in settlement of loans. Subsequent declines in value are charged to expense through a valuation allowance. Costs related to holding real estate are charged to operations as incurred.
Goodwill	Goodwill is initially recorded as the excess of the purchase price over the fair value of the net assets acquired in a business combination and is subsequently evaluated at least annually for impairment during the fourth quarter. At December 31, 2018 and 2017 , the amount of goodwill was $82.2 million . The goodwill relates to ASB and is the Company’s only intangible asset with an indefinite useful life. To determine if there was an impairment to the book value of goodwill pertaining to ASB, the fair value of ASB was estimated using a valuation method based on a market approach and discounted cash flow method with each method having an equal weighting in determining the fair value of ASB. The market approach considers publicly traded financial institutions and measures the institutions’ market values as a multiple to (1) net income and (2) book equity. The median market value multiples for net income and book equity from the selected institutions were applied to ASB’s net income and book equity to calculate ASB’s fair value using the market approach. The discounted cash flow method values a company on a going concern basis and is based on the concept that the future benefits derived from a particular company can be measured by its sustainable after-tax cash flows in the future.
Mortgage banking	Mortgage loans held for sale are stated at the lower of cost or estimated fair value on an aggregate basis. Premiums, discounts and net deferred loan fees are not amortized while a loan is classified as held-for-sale. A sale is recognized only when the consideration received is other than beneficial interests in the assets sold and control over the assets is transferred irrevocably to the buyer. Gains or losses on sales of loans are recognized at the time of sale and are determined by the difference between the net sales proceeds and the allocated basis of the loans sold. ASB is obligated to subsequently repurchase a loan if the purchaser discovers a standard representation or warranty violation such as noncompliance with eligibility requirements, customer fraud or servicing violations. This primarily occurs during a loan file review. ASB considers and records a reserve for loan repurchases if appropriate. ASB recognizes a mortgage servicing asset when a mortgage loan is sold with servicing rights retained. This mortgage servicing right (MSR) is initially capitalized at its presumed fair value based on market data at the time of sale and accounted for in subsequent periods at the lower of amortized cost or fair value. Mortgage servicing assets or liabilities are included as a component of gain on sale of loans. Under ASC Topic 860, “Transfers and Servicing,” ASB amortizes the MSRs in proportion to and over the period of estimated net servicing income and assess for impairment at each reporting date. ASB’s MSRs are stratified based on predominant risk characteristics of the underlying loans including loan type such as fixed-rate 15- and 30-year mortgages and note rate in bands primarily of 50 to 100 basis points. For each stratum, fair value is calculated by discounting expected net income streams using discount rates that reflect industry pricing for similar assets. Expected net income streams are estimated based on industry assumptions regarding prepayment expectations and income and expenses associated with servicing residential mortgage loans for others. ASB uses a present value cash flow model using techniques described above to estimate the fair value of MSRs. Because observable market prices with exact terms and conditions may not be readily available, ASB compares the fair value of MSRs to an estimated value calculated by an independent third-party on a semi-annual basis. The third-party relies on both published and unpublished sources of market related assumptions and their own experience and expertise to arrive at a value. ASB uses the third-party value only to assess the reasonableness of fair value generated by the valuation model. Impairment is recognized through a valuation allowance for each stratum when the carrying amount exceeds fair value, with any associated provision recorded as a component of loan servicing fees included in “Revenues - bank” in the consolidated statements of income. A direct write-down is recorded when the recoverability of the valuation allowance is deemed to be unrecoverable. Loan servicing fee income represents income earned for servicing mortgage loans owned by investors. It includes mortgage servicing fees and other ancillary servicing income, net of guaranty fees. Servicing fees are generally calculated on the outstanding principal balances of the loans serviced and are recorded as income when earned.
Tax credit investments	ASB invests in limited liability entities formed to operate qualifying affordable housing projects. The affordable housing investments provide tax benefits to investors in the form of tax deductions from operating losses and tax credits. As a limited partner, ASB has no significant influence over the operations. These investments are initially recorded at the initial capital contribution with a liability recognized for the commitment to contribute additional capital over the term of the investment. ASB uses the proportional amortization method of accounting for its investments. Under the proportional amortization method, ASB amortizes the cost of its investments in proportion to the tax credits and other tax benefits it receives. The amortization, tax credits and tax benefits are reported as a component of income tax expense. For these limited liability entities, ASB assesses whether it is the primary beneficiary of the limited liability entity, which is a variable interest entity (VIE). The primary beneficiary of a VIE is determined to be the party that meets both of the following criteria: (i) has the power to make decisions that most significantly affect the economic performance of the VIE; and (ii) has the obligation to absorb losses or the right to receive benefits that in either case could potentially be significant to the VIE. Generally, ASB, as a limited partner, is not deemed to be the primary beneficiary as it does not meet the power criterion, i.e., no power to direct the activities of a VIE that most significantly impact the VIE’s economic performance and no direct ability to unilaterally remove the general partner. All tax credit investments are evaluated for potential impairment at least annually, or more frequently, when events or conditions indicate that it is deemed probable that ASB will not recover its investment. If an investment is determined to be impaired, it is written down to its estimated fair value and the new cost basis of the investment is not adjusted for subsequent recoveries in value. As of December 31, 2018 , ASB did not have any impairment losses resulting from forfeiture or ineligibility of tax credits or other circumstances related to its low-income housing tax credit (LIHTC) investments.

Summary of significant accoun_3

Summary of significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Schedule of future minimum lease payments	HEI’s consolidated and the Utilities’ future minimum lease payments are as follows: (in millions) HEI Hawaiian Electric 2019 $ 11 $ 6 2020 9 6 2021 8 5 2022 5 2 2023 4 2 Thereafter 12 3 $ 49 $ 24
Summary of impact to prior period financial statements of the adoption of ASU 2017-07	The following table summarizes the impact to the prior period financial statements of the adoption of ASU No. 2017-07: 2017 2016 (in thousands) As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported HEI Consolidated Statements of Income Expenses Electric utility $ 2,000,045 $ (6,003 ) $ 1,994,042 $ 1,809,900 $ (5,602 ) $ 1,804,298 Bank 198,924 (820 ) 198,104 198,572 (875 ) 197,697 Other 18,365 (1,119 ) 17,246 24,007 (1,186 ) 22,821 Total expenses $ 2,217,334 $ (7,942 ) $ 2,209,392 $ 2,032,479 $ (7,663 ) $ 2,024,816 Operating income Electric utility $ 257,521 $ 6,003 $ 263,524 $ 284,468 $ 5,602 $ 290,070 Bank 98,716 820 99,536 87,352 875 88,227 Other (17,946 ) 1,119 (16,827 ) (23,645 ) 1,186 (22,459 ) Total operating income $ 338,291 $ 7,942 $ 346,233 $ 348,175 $ 7,663 $ 355,838 Retirement defined benefits expense--other than service costs $ — $ (7,942 ) $ (7,942 ) $ — $ (7,663 ) $ (7,663 ) Hawaiian Electric Consolidated Statements of Income Other operation and maintenance $ 417,910 $ (6,003 ) $ 411,907 $ 405,533 $ (5,602 ) $ 399,931 Total expense 2,000,045 (6,003 ) 1,994,042 1,809,900 (5,602 ) 1,804,298 Operating income 257,521 6,003 263,524 284,468 5,602 290,070 Retirement defined benefits expense--other than service costs — (6,003 ) (6,003 ) — (5,602 ) (5,602 ) Hawaiian Electric Consolidating Statements of Income (in Note 3) Hawaiian Electric (parent only) Other operation and maintenance 279,440 (5,049 ) 274,391 273,176 (5,058 ) 268,118 Total expense 1,425,655 (5,049 ) 1,420,606 1,277,245 (5,058 ) 1,272,187 Operating income 172,849 5,049 177,898 197,139 5,058 202,197 Retirement defined benefits expense--other than service costs — (5,049 ) (5,049 ) — (5,058 ) (5,058 ) 2017 2016 (in thousands) As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported As previously filed Adjustment from adoption of ASU No. 2017-07 As currently reported Hawaiian Electric Consolidating Statements of Income (in Note 3) Hawaii Electric Light Other operation and maintenance $ 66,277 $ (93 ) $ 66,184 $ 63,897 $ 319 $ 64,216 Total expense 287,868 (93 ) 287,775 266,823 319 267,142 Operating income 45,599 93 45,692 44,562 (319 ) 44,243 Retirement defined benefits expense--other than service costs — (93 ) (93 ) — 319 319 Maui Electric Other operation and maintenance 72,193 (861 ) 71,332 68,460 (863 ) 67,597 Total expense 286,522 (861 ) 285,661 265,832 (863 ) 264,969 Operating income 39,156 861 40,017 42,873 863 43,736 Retirement defined benefits expense--other than service costs — (861 ) (861 ) — (863 ) (863 ) ASB Statements of Income Data (in Note 4) Compensation and employee benefits 95,751 (820 ) 94,931 90,117 (875 ) 89,242 Other expense 19,324 820 20,144 18,487 875 19,362
Summary of amounts in income tax expense related to investments in qualifying affordable housing projects	The table below summarizes the amounts in income tax expense related to ASB’s LIHTC investments: Years ended December 31 2018 2017 2016 (in millions) Amounts in income taxes related to low-income housing tax credit investments Amortization recognized in the provision for income taxes $ (7.7 ) $ (7.4 ) $ (5.8 ) Tax credits and other tax benefits recognized in the provision for income taxes 10.9 10.7 8.4 Net benefit to income tax expense $ 3.2 $ 3.3 $ 2.6

Segment financial information (

Segment financial information (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Schedule of segment financial information	Segment financial information was as follows: (in thousands) Electric utility Bank Other Total 2018 Revenues from external customers $ 2,546,472 $ 314,275 $ 102 $ 2,860,849 Intersegment revenues (eliminations) 53 — (53 ) — Revenues 2,546,525 314,275 49 2,860,849 Depreciation and amortization 230,228 21,443 3,958 255,629 Interest expense, net 73,348 15,539 15,329 104,216 Income (loss) before income taxes 180,426 106,578 (32,543 ) 254,461 Income taxes (benefit) 34,778 24,069 (8,050 ) 50,797 Net income (loss) 145,648 82,509 (24,493 ) 203,664 Preferred stock dividends of subsidiaries 1,995 — (105 ) 1,890 Net income (loss) for common stock 143,653 82,509 (24,388 ) 201,774 Capital expenditures 445,863 72,666 18,840 537,369 Assets (at December 31, 2018) 5,967,503 7,027,894 108,654 13,104,051 2017 Revenues from external customers $ 2,257,455 $ 297,640 $ 530 $ 2,555,625 Intersegment revenues (eliminations) 111 — (111 ) — Revenues 2,257,566 297,640 419 2,555,625 Depreciation and amortization 201,282 19,416 1,300 221,998 Interest expense, net 69,637 12,156 9,335 91,128 Income (loss) before income taxes 205,145 98,716 (27,281 ) 276,580 Income taxes (benefit) 83,199 31,719 (5,525 ) 109,393 Net income (loss) 121,946 66,997 (21,756 ) 167,187 Preferred stock dividends of subsidiaries 1,995 — (105 ) 1,890 Net income (loss) for common stock 119,951 66,997 (21,651 ) 165,297 Capital expenditures 441,598 53,272 317 495,187 Assets (at December 31, 2017) 1 5,630,613 6,798,659 104,888 12,534,160 (in thousands) Electric utility Bank Other Total 2016 Revenues from external customers $ 2,094,224 $ 285,924 $ 506 $ 2,380,654 Intersegment revenues (eliminations) 144 — (144 ) — Revenues 2,094,368 285,924 362 2,380,654 Depreciation and amortization 193,996 9,813 937 204,746 Interest expense, net 66,824 12,755 8,979 88,558 Income before income taxes 229,113 87,352 57,376 373,841 Income taxes 84,801 30,073 8,821 123,695 Net income 144,312 57,279 48,555 250,146 Preferred stock dividends of subsidiaries 1,995 — (105 ) 1,890 Net income for common stock 142,317 57,279 48,660 248,256 Capital expenditures 320,437 9,394 212 330,043 Assets (at December 31, 2016) 1 5,431,903 6,421,357 28,721 11,881,981 1 Contributions in aid of construction balances were reclassified from liabilities to “Property, plant and equipment, net” and “Total property, plant and equipment, net” for the Company and Hawaiian Electric, respectively, which reduced the amounts of the respective balances.

Electric utility segment (Table

Electric utility segment (Tables)	12 Months Ended
	Dec. 31, 2018
Electric utility subsidiary
Schedule of consolidating statements of income	Statements of Income Data Years ended December 31 2018 2017 2016 (in thousands) Interest and dividend income Interest and fees on loans $ 220,463 $ 207,255 $ 199,774 Interest and dividends on investment securities 37,762 28,823 19,184 Total interest and dividend income 258,225 236,078 218,958 Interest expense Interest on deposit liabilities 13,991 9,660 7,167 Interest on other borrowings 1,548 2,496 5,588 Total interest expense 15,539 12,156 12,755 Net interest income 242,686 223,922 206,203 Provision for loan losses 14,745 10,901 16,763 Net interest income after provision for loan losses 227,941 213,021 189,440 Noninterest income Fees from other financial services 18,937 22,796 22,384 Fee income on deposit liabilities 21,311 22,204 21,759 Fee income on other financial products 7,052 7,205 8,707 Bank-owned life insurance 5,057 5,539 4,637 Mortgage banking income 1,493 2,201 6,625 Gains on sale of investment securities, net — — 598 Other income, net 2,200 1,617 2,256 Total noninterest income 56,050 61,562 66,966 Noninterest expense Compensation and employee benefits 98,387 94,931 89,242 Occupancy 17,073 16,699 16,321 Data processing 14,268 13,280 13,030 Services 10,847 10,994 11,054 Equipment 7,186 7,232 6,938 Office supplies, printing and postage 6,134 6,182 6,075 Marketing 3,567 3,501 3,489 FDIC insurance 2,713 2,904 3,543 Other expense 17,238 20,144 19,362 Total noninterest expense 177,413 175,867 169,054 Income before income taxes 106,578 98,716 87,352 Income taxes 24,069 31,719 30,073 Net income $ 82,509 $ 66,997 $ 57,279 Reconciliation to amounts per HEI Consolidated Statements of Income*: Years ended December 31 2018 2017 2016 (in thousands) Interest and dividend income $ 258,225 $ 236,078 $ 218,958 Noninterest income 56,050 61,562 66,966 *Revenues-Bank 314,275 297,640 285,924 Total interest expense 15,539 12,156 12,755 Provision for loan losses 14,745 10,901 16,763 Total noninterest expense 177,413 175,867 169,054 Less: Retirement defined benefits expense—other than service costs (1,657 ) (820 ) (875 ) *Expenses-Bank 206,040 198,104 197,697 *Operating income-Bank 108,235 99,536 88,227 Add back: Retirement defined benefits expense—other than service costs 1,657 820 875 Income before income taxes $ 106,578 $ 98,716 $ 87,352
Schedule of consolidating balance sheets	Balance Sheets Data December 31 2018 2017 (in thousands) Assets Cash and due from banks $ 122,059 $ 140,934 Interest-bearing deposits 4,225 93,165 Investment securities Available-for-sale, at fair value 1,388,533 1,401,198 Held-to-maturity, at amortized cost (fair value of $142,057 and $44,412 at December 31, 2018 and 2017, respectively) 141,875 44,515 Stock in Federal Home Loan Bank, at cost 9,958 9,706 Loans held for investment 4,843,021 4,670,768 Allowance for loan losses (52,119 ) (53,637 ) Net loans 4,790,902 4,617,131 Loans held for sale, at lower of cost or fair value 1,805 11,250 Other 486,347 398,570 Goodwill 82,190 82,190 Total assets $ 7,027,894 $ 6,798,659 Liabilities and shareholder’s equity Deposit liabilities–noninterest-bearing $ 1,800,727 $ 1,760,233 Deposit liabilities–interest-bearing 4,358,125 4,130,364 Other borrowings 110,040 190,859 Other 124,613 110,356 Total liabilities 6,393,505 6,191,812 Commitments and contingencies Common stock 1 1 Additional paid in capital 347,170 345,018 Retained earnings 325,286 292,957 Accumulated other comprehensive loss, net of tax benefits Net unrealized losses on securities $ (24,423 ) $ (14,951 ) Retirement benefit plans (13,645 ) (38,068 ) (16,178 ) (31,129 ) Total shareholder’s equity 634,389 606,847 Total liabilities and shareholder’s equity $ 7,027,894 $ 6,798,659 December 31 2018 2017 (in thousands) Other assets Bank-owned life insurance $ 151,172 $ 148,775 Premises and equipment, net 214,415 136,270 Accrued interest receivable 20,140 18,724 Mortgage servicing rights 8,062 8,639 Low-income housing investments 67,626 59,016 Real estate acquired in settlement of loans, net 406 133 Other 24,526 27,013 $ 486,347 $ 398,570 Other liabilities Accrued expenses $ 54,084 $ 39,312 Federal and state income taxes payable 2,012 3,736 Cashier’s checks 26,906 27,000 Advance payments by borrowers 10,183 10,245 Other 31,428 30,063 $ 124,613 $ 110,356
Hawaiian Electric Company, Inc. and Subsidiaries
Electric utility subsidiary
Schedule of regulatory assets	Regulatory assets were as follows: December 31 2018 2017 (in thousands) Retirement benefit plans (balance primarily varies with plans’ funded statuses) $ 624,126 $ 637,204 Income taxes (1-55 years) 114,076 118,201 Decoupling revenue balancing account and RAM regulatory asset (1-2 years) 49,560 64,087 Unamortized expense and premiums on retired debt and equity issuances (19-30 years; 6-18 years remaining) 10,065 11,993 Vacation earned, but not yet taken (1 year) 10,820 11,224 Other (1-50 years; 1-46 years remaining) 24,779 26,588 $ 833,426 $ 869,297 Included in: Current assets $ 71,016 $ 88,390 Long-term assets 762,410 780,907 $ 833,426 $ 869,297
Schedule of regulatory liabilities	Regulatory liabilities were as follows: December 31 2018 2017 (in thousands) Cost of removal in excess of salvage value (1-60 years) $ 491,006 $ 453,986 Income taxes (1-55 years) 413,339 406,324 Retirement benefit plans (5 years beginning with respective utility’s next rate case) 9,546 9,961 Other (5 years; 1-2 years remaining) 36,345 10,499 $ 950,236 $ 880,770 Included in: Current liabilities $ 17,977 $ 3,401 Long-term liabilities 932,259 877,369 $ 950,236 $ 880,770
Schedule of voluntary liquidation and redemption prices of cumulative preferred stock	The following series of cumulative preferred stock are redeemable only at the option of the respective company at the following prices in the event of voluntary liquidation or redemption: December 31, 2018 Voluntary liquidation price Redemption price Series C, D, E, H, J and K (Hawaiian Electric) $ 20 $ 21 I (Hawaiian Electric) 20 20 G (Hawaii Electric Light) 100 100 H (Maui Electric) 100 100
Schedule of purchases from all IPPs	Purchases from all IPPs were as follows: Years ended December 31 2018 2017 2016 (in millions) Kalaeloa $ 216 $ 180 $ 152 AES Hawaii 140 140 149 HPOWER 69 67 71 Puna Geothermal Venture 15 38 28 Hamakua Energy 56 35 29 Hawaiian Commercial & Sugar — — 1 Wind IPPs 107 97 113 Solar IPPs 29 27 15 Other IPPs 1 7 3 5 Total IPPs $ 639 $ 587 $ 563
Schedule of changes in asset retirement obligation	Changes to the ARO liability included in “Other liabilities” on Hawaiian Electric’s balance sheet were as follows: (in thousands) 2018 2017 Balance, January 1 $ 6,035 $ 25,589 Accretion expense 282 10 Liabilities incurred 1,058 5,370 Liabilities settled (74 ) (527 ) Revisions in estimated cash flows 1,125 (24,407 ) Balance, December 31 $ 8,426 $ 6,035
Schedule of net annual incremental amounts proposed to be collected (refunded)	The net annual incremental amounts to be collected (refunded) from June 1, 2018 through May 31, 2019 are as follows: (in millions) Hawaiian Electric Hawaii Electric Light Maui Electric 2018 Annual incremental RAM adjusted revenues* $ 13.8 $ 3.4 $ 2.0 Annual change in accrued RBA balance as of December 31, 2017 (and associated revenue taxes) $ 6.6 $ 0.7 $ 3.2 2017 Tax Act Adjustment ** $ — $ — $ (2.8 ) Net annual incremental amount to be collected under the tariffs $ 20.4 $ 4.1 $ 2.4 * The 2018 annual RAM adjusted revenues for Maui Electric terminated on August 23, 2018, the effective date of interim increase tariff rates that were implemented pursuant to the Interim D&O issued in the Maui Electric consolidated 2015 and 2018 rate case. ** Maui Electric incorporated a $2.8 million adjustment into its 2018 annual decoupling filing to incorporate the impact of the lower corporate income tax rate and the exclusion of the domestic production activities deduction, as a result of the 2017 Tax Cuts and Jobs Act (the Tax Act). Tax adjustments for Hawaiian Electric and Hawaii Electric Light are described in the discussion below of their respective on-going rate cases.
Schedule of consolidating statements of income	Consolidating statement of income Year ended December 31, 2018 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Revenues $ 1,802,550 375,493 368,700 — (218 ) [1] $ 2,546,525 Expenses Fuel oil 523,706 90,792 146,030 — — 760,528 Purchased power 494,450 95,838 49,019 — — 639,307 Other operation and maintenance 313,346 70,396 77,749 — — 461,491 Depreciation 137,410 40,235 25,981 — — 203,626 Taxes, other than income taxes 170,363 34,850 34,699 — — 239,912 Total expenses 1,639,275 332,111 333,478 — — 2,304,864 Operating income 163,275 43,382 35,222 — (218 ) 241,661 Allowance for equity funds used during construction 9,208 478 1,191 — — 10,877 Equity in earnings of subsidiaries 45,393 — — — (45,393 ) [2] — Retirement defined benefits expense—other than service costs (2,649 ) (417 ) (565 ) — — (3,631 ) Interest expense and other charges, net (52,180 ) (11,836 ) (9,550 ) — 218 [1] (73,348 ) Allowance for borrowed funds used during construction 4,019 276 572 — — 4,867 Income before income taxes 167,066 31,883 26,870 — (45,393 ) 180,426 Income taxes 22,333 6,868 5,577 — — 34,778 Net income 144,733 25,015 21,293 — (45,393 ) 145,648 Preferred stock dividends of subsidiaries — 534 381 — — 915 Net income attributable to Hawaiian Electric 144,733 24,481 20,912 — (45,393 ) 144,733 Preferred stock dividends of Hawaiian Electric 1,080 — — — — 1,080 Net income for common stock $ 143,653 24,481 20,912 — (45,393 ) $ 143,653 Consolidating statement of income Year ended December 31, 2016 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Revenues $ 1,474,384 311,385 308,705 — (106 ) [1] $ 2,094,368 Expenses Fuel oil 305,359 55,094 94,251 — — 454,704 Purchased power 431,009 81,018 50,713 — — 562,740 Other operation and maintenance 268,118 64,216 67,597 — — 399,931 Depreciation 126,086 37,797 23,178 — — 187,061 Taxes, other than income taxes 141,615 29,017 29,230 — — 199,862 Total expenses 1,272,187 267,142 264,969 — — 1,804,298 Operating income 202,197 44,243 43,736 — (106 ) 290,070 Allowance for equity funds used during construction 6,659 765 901 — — 8,325 Equity in earnings of subsidiaries 42,391 — — — (42,391 ) [2] — Retirement defined benefits expense—other than service costs (5,058 ) 319 (863 ) — — (5,602 ) Interest expense and other charges, net (45,839 ) (11,555 ) (9,536 ) — 106 [1] (66,824 ) Allowance for borrowed funds used during construction 2,484 294 366 — — 3,144 Income before income taxes 202,834 34,066 34,604 — (42,391 ) 229,113 Income taxes 59,437 12,277 13,087 — — 84,801 Net income 143,397 21,789 21,517 — (42,391 ) 144,312 Preferred stock dividends of subsidiaries — 534 381 — — 915 Net income attributable to Hawaiian Electric 143,397 21,255 21,136 — (42,391 ) 143,397 Preferred stock dividends of Hawaiian Electric 1,080 — — — — 1,080 Net income for common stock $ 142,317 21,255 21,136 — (42,391 ) $ 142,317 Consolidating statement of income Year ended December 31, 2017 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Revenues $ 1,598,504 333,467 325,678 — (83 ) [1] $ 2,257,566 Expenses Fuel oil 408,204 63,894 115,670 — — 587,768 Purchased power 454,189 87,772 44,673 — — 586,634 Other operation and maintenance 274,391 66,184 71,332 — — 411,907 Depreciation 130,889 38,741 23,154 — — 192,784 Taxes, other than income taxes 152,933 31,184 30,832 — — 214,949 Total expenses 1,420,606 287,775 285,661 — — 1,994,042 Operating income 177,898 45,692 40,017 — (83 ) 263,524 Allowance for equity funds used during construction 10,896 554 1,033 — — 12,483 Equity in earnings of subsidiaries 38,057 — — — (38,057 ) [2] — Retirement defined benefits expense—other than service costs (5,049 ) (93 ) (861 ) — — (6,003 ) Interest expense and other charges, net (48,277 ) (11,799 ) (9,644 ) 83 [1] (69,637 ) Allowance for borrowed funds used during construction 4,089 238 451 — — 4,778 Income before income taxes 177,614 34,592 30,996 — (38,057 ) 205,145 Income taxes 56,583 13,912 12,704 — — 83,199 Net income 121,031 20,680 18,292 — (38,057 ) 121,946 Preferred stock dividends of subsidiaries — 534 381 — — 915 Net income attributable to Hawaiian Electric 121,031 20,146 17,911 — (38,057 ) 121,031 Preferred stock dividends of Hawaiian Electric 1,080 — — — — 1,080 Net income for common stock $ 119,951 20,146 17,911 — (38,057 ) $ 119,951
Schedule of consolidating statements of comprehensive income	Consolidating statement of comprehensive income Year ended December 31, 2017 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Net income for common stock $ 119,951 20,146 17,911 — (38,057 ) $ 119,951 Other comprehensive income (loss), net of taxes: Derivatives qualified as cash flow hedges: Reclassification adjustment to net income, net of tax benefits 454 — — — — 454 Retirement benefit plans: Net losses arising during the period, net of tax benefits 63,105 3,093 7,329 — (10,422 ) [1] 63,105 Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 14,477 1,903 1,619 — (3,522 ) [1] 14,477 Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (78,724 ) (4,994 ) (9,003 ) — 13,997 [1] (78,724 ) Other comprehensive income (loss), net of taxes (688 ) 2 (55 ) — 53 (688 ) Comprehensive income attributable to common shareholder $ 119,263 20,148 17,856 — (38,004 ) $ 119,263 Consolidating statement of comprehensive income Year ended December 31, 2018 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Net income for common stock $ 143,653 24,481 20,912 — (45,393 ) $ 143,653 Other comprehensive income (loss), net of taxes: Retirement benefit plans: Net losses arising during the period, net of tax benefits (26,019 ) (6,090 ) (5,004 ) — 11,094 [1] (26,019 ) Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 19,012 2,819 2,423 — (5,242 ) [1] 19,012 Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 8,325 3,305 2,788 — (6,093 ) [1] 8,325 Other comprehensive income, net of taxes 1,318 34 207 — (241 ) 1,318 Comprehensive income attributable to common shareholder $ 144,971 24,515 21,119 — (45,634 ) $ 144,971 Consolidating statement of comprehensive income Year ended December 31, 2016 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Net income for common stock $ 142,317 21,255 21,136 — (42,391 ) $ 142,317 Other comprehensive income (loss), net of taxes: Derivatives qualified as cash flow hedges: Effective portion of foreign currency hedge net unrealized losses arising during the period, net of tax benefits (281 ) — — — — (281 ) Less: reclassification adjustment to net income, net of taxes (173 ) — — — — (173 ) Retirement benefit plans: Net losses arising during the period, net of tax benefits (42,631 ) (5,141 ) (5,447 ) — 10,588 [1] (42,631 ) Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 13,254 1,718 1,549 — (3,267 ) [1] 13,254 Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of tax benefits 28,584 3,269 3,852 — (7,121 ) [1] 28,584 Other comprehensive loss, net of tax benefits (1,247 ) (154 ) (46 ) — 200 (1,247 ) Comprehensive income attributable to common shareholder $ 141,070 21,101 21,090 — (42,191 ) $ 141,070
Schedule of consolidating balance sheets	Consolidating balance sheet December 31, 2018 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Assets Property, plant and equipment Utility property, plant and equipment Land $ 40,449 5,606 3,612 — — $ 49,667 Plant and equipment 4,456,090 1,259,553 1,094,028 — — 6,809,671 Less accumulated depreciation (1,523,861 ) (547,848 ) (505,633 ) — — (2,577,342 ) Construction in progress 193,677 8,781 30,687 — — 233,145 Utility property, plant and equipment, net 3,166,355 726,092 622,694 — — 4,515,141 Nonutility property, plant and equipment, less accumulated depreciation 5,314 115 1,532 — — 6,961 Total property, plant and equipment, net 3,171,669 726,207 624,226 — — 4,522,102 Investment in wholly-owned subsidiaries, at equity 576,838 — — — (576,838 ) [2] — Current assets Cash and cash equivalents 16,732 15,623 3,421 101 — 35,877 Customer accounts receivable, net 125,960 26,483 25,453 — — 177,896 Accrued unbilled revenues, net 88,060 17,051 16,627 — — 121,738 Other accounts receivable, net 21,962 3,131 3,033 — (21,911 ) [1] 6,215 Fuel oil stock, at average cost 54,262 11,027 14,646 — — 79,935 Materials and supplies, at average cost 30,291 7,155 17,758 — — 55,204 Prepayments and other 23,214 5,212 3,692 — — 32,118 Regulatory assets 60,093 3,177 7,746 — — 71,016 Total current assets 420,574 88,859 92,376 101 (21,911 ) 579,999 Other long-term assets Regulatory assets 537,708 120,658 104,044 — — 762,410 Other 69,749 15,944 17,299 — — 102,992 Total other long-term assets 607,457 136,602 121,343 — — 865,402 Total assets $ 4,776,538 951,668 837,945 101 (598,749 ) $ 5,967,503 Capitalization and liabilities Capitalization Common stock equity $ 1,957,641 295,874 280,863 101 (576,838 ) [2] $ 1,957,641 Cumulative preferred stock–not subject to mandatory redemption 22,293 7,000 5,000 — — 34,293 Long-term debt, net 1,000,137 217,749 200,916 — — 1,418,802 Total capitalization 2,980,071 520,623 486,779 101 (576,838 ) 3,410,736 Current liabilities Short-term borrowings-non-affiliate 25,000 — — — — 25,000 Accounts payable 126,384 20,045 25,362 — — 171,791 Interest and preferred dividends payable 16,203 4,203 2,841 — (32 ) [1] 23,215 Taxes accrued 164,747 34,128 34,458 — — 233,333 Regulatory liabilities 7,699 4,872 5,406 — — 17,977 Other 46,391 15,077 20,414 — (21,879 ) [1] 60,003 Total current liabilities 386,424 78,325 88,481 — (21,911 ) 531,319 Deferred credits and other liabilities Deferred income taxes 271,438 54,936 56,823 — — 383,197 Regulatory liabilities 657,210 176,101 98,948 — — 932,259 Unamortized tax credits 60,271 16,217 15,034 — — 91,522 Defined benefit pension and other postretirement benefit plans liability 359,174 73,147 71,338 — — 503,659 Other 61,950 32,319 20,542 — — 114,811 Total deferred credits and other liabilities 1,410,043 352,720 262,685 — — 2,025,448 Total capitalization and liabilities $ 4,776,538 951,668 837,945 101 (598,749 ) $ 5,967,503 Consolidating balance sheet December 31, 2017 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Assets Property, plant and equipment Utility property, plant and equipment Land $ 40,392 5,922 3,016 — — $ 49,330 Plant and equipment 4,144,472 1,207,043 1,053,372 — — 6,404,887 Less accumulated depreciation (1,451,612 ) (528,024 ) (496,716 ) — — (2,476,352 ) Construction in progress 231,571 8,182 23,341 — — 263,094 Utility property, plant and equipment, net 2,964,823 693,123 583,013 — — 4,240,959 Nonutility property, plant and equipment, less accumulated depreciation 5,933 115 1,532 — — 7,580 Total property, plant and equipment, net 2,970,756 693,238 584,545 — — 4,248,539 Investment in wholly-owned subsidiaries, at equity 557,013 — — — (557,013 ) [2] — Current assets Cash and cash equivalents 2,059 4,025 6,332 101 — 12,517 Advances to affiliates — — 12,000 — (12,000 ) [1] — Customer accounts receivable, net 86,987 22,510 18,392 — — 127,889 Accrued unbilled revenues, net 77,176 15,940 13,938 — — 107,054 Other accounts receivable, net 11,376 2,268 1,210 — (7,691 ) [1] 7,163 Fuel oil stock, at average cost 64,972 8,698 13,203 — — 86,873 Materials and supplies, at average cost 28,325 8,041 18,031 — — 54,397 Prepayments and other 17,928 4,514 2,913 — — 25,355 Regulatory assets 76,203 5,038 7,149 — — 88,390 Total current assets 365,026 71,034 93,168 101 (19,691 ) 509,638 Other long-term assets Regulatory assets 557,464 122,783 100,660 — — 780,907 Other 60,157 16,311 15,061 — — 91,529 Total other long-term assets 617,621 139,094 115,721 — — 872,436 Total assets $ 4,510,416 903,366 793,434 101 (576,704 ) $ 5,630,613 Capitalization and liabilities Capitalization Common stock equity $ 1,845,283 286,647 270,265 101 (557,013 ) [2] $ 1,845,283 Cumulative preferred stock–not subject to mandatory redemption 22,293 7,000 5,000 — — 34,293 Long-term debt, net 924,979 202,701 190,836 — — 1,318,516 Total capitalization 2,792,555 496,348 466,101 101 (557,013 ) 3,198,092 Current liabilities Current portion of long-term debt 29,978 10,992 8,993 — — 49,963 Short-term borrowings-non-affiliate 4,999 — — — — 4,999 Short-term borrowings-affiliate 12,000 — — — (12,000 ) [1] — Accounts payable 121,328 17,855 20,427 — — 159,610 Interest and preferred dividends payable 15,677 4,174 2,735 — (11 ) [1] 22,575 Taxes accrued 133,839 34,950 30,312 — — 199,101 Regulatory liabilities 607 1,245 1,549 — — 3,401 Other 43,121 9,818 14,197 — (7,680 ) [1] 59,456 Total current liabilities 361,549 79,034 78,213 — (19,691 ) 499,105 Deferred credits and other liabilities Deferred income taxes 281,223 56,955 55,863 — — 394,041 Regulatory liabilities 613,329 169,139 94,901 — — 877,369 Unamortized tax credits 59,039 16,167 15,163 — — 90,369 Defined benefit pension and other postretirement benefit plans liability 340,983 66,447 65,518 — — 472,948 Other 61,738 19,276 17,675 — — 98,689 Total deferred credits and other liabilities 1,356,312 327,984 249,120 — — 1,933,416 Total capitalization and liabilities $ 4,510,416 903,366 793,434 101 (576,704 ) $ 5,630,613
Schedule of consolidating statements of changes in common stock equity	Consolidating statements of changes in common stock equity (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Balance, December 31, 2015 $ 1,728,325 292,702 263,725 101 (556,528 ) $ 1,728,325 Net income for common stock 142,317 21,255 21,136 — (42,391 ) 142,317 Other comprehensive loss, net of tax benefits (1,247 ) (154 ) (46 ) — 200 (1,247 ) Issuance of common stock, net of expenses 23,991 (5 ) — — 5 23,991 Common stock dividends (93,599 ) (22,507 ) (25,261 ) — 47,768 (93,599 ) Balance, December 31, 2016 1,799,787 291,291 259,554 101 (550,946 ) 1,799,787 Net income for common stock 119,951 20,146 17,911 — (38,057 ) 119,951 Other comprehensive income (loss), net of taxes (688 ) 2 (55 ) — 53 (688 ) Issuance of common stock, net of expenses 14,000 4 4,801 — (4,805 ) 14,000 Common stock dividends (87,767 ) (24,796 ) (11,946 ) — 36,742 (87,767 ) Balance, December 31, 2017 1,845,283 286,647 270,265 101 (557,013 ) 1,845,283 Net income for common stock 143,653 24,481 20,912 — (45,393 ) 143,653 Other comprehensive income, net of taxes 1,318 34 207 — (241 ) 1,318 Issuance of common stock, net of expenses 70,692 1 1,498 — (1,499 ) 70,692 Common stock dividends (103,305 ) (15,289 ) (12,019 ) — 27,308 (103,305 ) Balance, December 31, 2018 $ 1,957,641 295,874 280,863 101 (576,838 ) $ 1,957,641
Schedule of consolidating statements of cash flows	Consolidating statement of cash flows Year ended December 31, 2018 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Cash flows from operating activities Net income $ 144,733 25,015 21,293 — (45,393 ) [2] $ 145,648 Adjustments to reconcile net income to net cash provided by operating activities Equity in earnings of subsidiaries (45,493 ) — — — 45,393 [2] (100 ) Common stock dividends received from subsidiaries 27,408 — — — (27,308 ) [2] 100 Depreciation of property, plant and equipment 137,410 40,235 25,981 — — 203,626 Other amortization 20,956 5,069 577 — — 26,602 Deferred income taxes (9,806 ) (341 ) 2,165 — — (7,982 ) Allowance for equity funds used during construction (9,208 ) (478 ) (1,191 ) — — (10,877 ) Other (1,033 ) (213 ) (324 ) — — (1,570 ) Changes in assets and liabilities: Increase in accounts receivable (51,656 ) (4,867 ) (8,614 ) — 14,220 [1] (50,917 ) Increase in accrued unbilled revenues (10,884 ) (1,111 ) (2,689 ) — — (14,684 ) Decrease (increase) in fuel oil stock 10,710 (2,329 ) (1,443 ) — — 6,938 Decrease (increase) in materials and supplies (1,966 ) 886 273 — — (807 ) Decrease (increase) in regulatory assets 12,192 71 (3,011 ) — — 9,252 Increase in accounts payable 14,748 6,104 3,506 — — 24,358 Change in prepaid and accrued income taxes, tax credits and revenue taxes 24,438 (2,118 ) 3,047 — (331 ) [1] 25,036 Increase (decrease) in defined benefit pension and other postretirement benefit plans liability 17,178 (760 ) 2,328 — — 18,746 Change in other assets and liabilities 18,484 8,186 7,794 — (14,220 ) [1] 20,244 Net cash provided by operating activities 298,211 73,349 49,692 — (27,639 ) 393,613 Cash flows from investing activities Capital expenditures (330,531 ) (54,553 ) (60,779 ) — — (445,863 ) Contributions in aid of construction 24,828 3,499 2,272 — — 30,599 Advances from (to) affiliates — — 12,000 — (12,000 ) [1] — Other 3,226 1,182 3,843 — 1,831 [1], [2] 10,082 Net cash used in investing activities (302,477 ) (49,872 ) (42,664 ) — (10,169 ) (405,182 ) Cash flows from financing activities Common stock dividends (103,305 ) (15,289 ) (12,019 ) — 27,308 [2] (103,305 ) Preferred stock dividends of Hawaiian Electric and subsidiaries (1,080 ) (534 ) (381 ) — — (1,995 ) Proceeds from issuance of common stock 70,700 — 1,500 — (1,500 ) [2] 70,700 Proceeds from issuance of long-term debt 75,000 15,000 10,000 — — 100,000 Repayment of long-term debt (30,000 ) (11,000 ) (9,000 ) — — (50,000 ) Net decrease in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less (16,999 ) — — — 12,000 [1] (4,999 ) Proceeds from other bank borrowings 25,000 — — — — 25,000 Other (377 ) (56 ) (39 ) — — (472 ) Net cash provided by (used in) financing activities 18,939 (11,879 ) (9,939 ) — 37,808 34,929 Net increase (decrease) in cash and cash equivalents 14,673 11,598 (2,911 ) — — 23,360 Cash and cash equivalents, January 1 2,059 4,025 6,332 101 — 12,517 Cash and cash equivalents, December 31 $ 16,732 15,623 3,421 101 — $ 35,877 Consolidating statement of cash flows Year ended December 31, 2017 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating adjustments Hawaiian Electric Cash flows from operating activities Net income $ 121,031 20,680 18,292 — (38,057 ) [2] $ 121,946 Adjustments to reconcile net income to net cash provided by operating activities Equity in earnings of subsidiaries (38,157 ) — — — 38,057 [2] (100 ) Common stock dividends received from subsidiaries 36,867 — — — (36,742 ) [2] 125 Depreciation of property, plant and equipment 130,889 38,741 23,154 — — 192,784 Other amortization 2,398 3,225 2,875 — — 8,498 Deferred income taxes 26,342 3,954 8,004 — (263 ) [1] 38,037 Allowance for equity funds used during construction (10,896 ) (554 ) (1,033 ) — — (12,483 ) Other (1,154 ) 430 (342 ) — — (1,066 ) Changes in assets and liabilities: Decrease (increase) in accounts receivable 1,817 (359 ) 45 — 1,411 [1] 2,914 Increase in accrued unbilled revenues (11,355 ) (2,376 ) (1,630 ) — — (15,361 ) Increase in fuel oil stock (17,733 ) (469 ) (2,241 ) — — (20,443 ) Decrease (increase) in materials and supplies 1,603 (661 ) (1,660 ) — — (718 ) Increase in regulatory assets (8,395 ) (4,007 ) (4,854 ) — — (17,256 ) Increase (decrease) in accounts payable 23,519 (3,547 ) 5,762 — — 25,734 Change in prepaid and accrued income taxes, tax credits and revenue taxes 16,716 7,961 5,362 — (177 ) [1] 29,862 Increase (decrease) in defined benefit pension and other postretirement benefit plans liability 709 52 (157 ) — — 604 Change in other assets and liabilities (16,213 ) (433 ) 166 — (1,411 ) [1] (17,891 ) Net cash provided by operating activities 257,988 62,637 51,743 — (37,182 ) 335,186 Cash flows from investing activities Capital expenditures (339,279 ) (52,077 ) (50,242 ) — — (441,598 ) Contributions in aid of construction 57,527 4,293 2,913 — — 64,733 Advances from (to) affiliates — 3,500 (2,000 ) — (1,500 ) [1] — Other (1,711 ) 649 400 — 5,240 [1],[2] 4,578 Net cash used in investing activities (283,463 ) (43,635 ) (48,929 ) — 3,740 (372,287 ) Cash flows from financing activities Common stock dividends (87,767 ) (24,796 ) (11,946 ) — 36,742 [2] (87,767 ) Preferred stock dividends of Hawaiian Electric and subsidiaries (1,080 ) (534 ) (381 ) — — (1,995 ) Proceeds from the issuance of common stock 14,000 — 4,800 — (4,800 ) [2] 14,000 Proceeds from the issuance of long-term debt 202,000 28,000 85,000 — — 315,000 Funds transferred for redemption of special purpose revenue bonds (162,000 ) (28,000 ) (75,000 ) — — (265,000 ) Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less 3,499 — — — 1,500 [1] 4,999 Other (2,506 ) (396 ) (1,003 ) — — (3,905 ) Net cash provided by (used in) financing activities (33,854 ) (25,726 ) 1,470 — 33,442 (24,668 ) Net increase (decrease) in cash and cash equivalents (59,329 ) (6,724 ) 4,284 — — (61,769 ) Cash and cash equivalents, January 1 61,388 10,749 2,048 101 — 74,286 Cash and cash equivalents, December 31 $ 2,059 4,025 6,332 101 — $ 12,517 Consolidating statement of cash flows Year ended December 31, 2016 (in thousands) Hawaiian Electric Hawaii Electric Light Maui Electric Other subsidiaries Consolidating Hawaiian Electric Cash flows from operating activities Net income $ 143,397 21,789 21,517 — (42,391 ) [2] $ 144,312 Adjustments to reconcile net income to net cash provided by operating activities Equity in earnings of subsidiaries (42,491 ) — — — 42,391 [2] (100 ) Common stock dividends received from subsidiaries 47,843 — — — (47,768 ) [2] 75 Depreciation of property, plant and equipment 126,086 37,797 23,178 — — 187,061 Other amortization 2,979 1,817 2,139 — — 6,935 Deferred income taxes 54,721 7,027 12,661 — (23 ) [1] 74,386 Allowance for equity funds used during construction (6,659 ) (765 ) (901 ) — — (8,325 ) Other (2,517 ) (750 ) (433 ) — — (3,700 ) Changes in assets and liabilities: Decrease (increase) in accounts receivable 10,175 (718 ) 1,776 — (2,682 ) [1] 8,551 Increase in accrued unbilled revenues (5,741 ) (1,033 ) (410 ) — — (7,184 ) Decrease in fuel oil stock 2,216 81 2,489 — — 4,786 Decrease (increase) in materials and supplies 993 (515 ) 272 — — 750 Increase in regulatory assets (16,161 ) (1,243 ) (869 ) — — (18,273 ) Increase (decrease) in accounts payable (10,247 ) 768 (1,135 ) — — (10,614 ) Change in prepaid and accrued income taxes, tax credits and revenue taxes 2,933 2,645 (3,478 ) — 23 [1] 2,123 Increase (decrease) in defined benefit pension and other postretirement benefit plans liability 599 53 (168 ) — — 484 Change in other assets and liabilities (11,682 ) (78 ) (2,272 ) — 2,682 [1] (11,350 ) Net cash provided by operating activities 296,444 66,875 54,366 — (47,768 ) 369,917 Cash flows from investing activities Capital expenditures (236,425 ) (51,344 ) (32,668 ) — — (320,437 ) Contributions in aid of construction 23,611 3,412 3,077 — — 30,100 Advances from (to) affiliates — 12,000 (2,500 ) — (9,500 ) [1] — Other 1,932 175 31 — — 2,138 Net cash used in investing activities (210,882 ) (35,757 ) (32,060 ) — (9,500 ) (288,199 ) Cash flows from financing activities Common stock dividends (93,599 ) (22,507 ) (25,261 ) — 47,768 [2] (93,599 ) Preferred stock dividends of Hawaiian Electric and subsidiaries (1,080 ) (534 ) (381 ) — — (1,995 ) Proceeds from the issuance of common stock 24,000 — — — — 24,000 Proceeds from the issuance of long-term debt 40,000 — — — — 40,000 Net decrease in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less (9,500 ) — — — 9,500 [1] — Other (276 ) (10 ) (1 ) — — (287 ) Net cash used in financing activities (40,455 ) (23,051 ) (25,643 ) — 57,268 (31,881 ) Net increase (decrease) in cash and cash equivalents 45,107 8,067 (3,337 ) — — 49,837 Cash and cash equivalents, January 1 16,281 2,682 5,385 101 — 24,449 Cash and cash equivalents, December 31 $ 61,388 10,749 2,048 101 — $ 74,286 Explanation of consolidating adjustments on consolidating schedules: [1] Eliminations of intercompany receivables and payables and other intercompany transactions. [2] Elimination of investment in subsidiaries, carried at equity.

Bank segment (HEI only) (Tables

Bank segment (HEI only) (Tables)	12 Months Ended
	Dec. 31, 2018
Bank Segment Disclosure [Abstract]
Schedule of statements of income data	Statements of Income Data Years ended December 31 2018 2017 2016 (in thousands) Interest and dividend income Interest and fees on loans $ 220,463 $ 207,255 $ 199,774 Interest and dividends on investment securities 37,762 28,823 19,184 Total interest and dividend income 258,225 236,078 218,958 Interest expense Interest on deposit liabilities 13,991 9,660 7,167 Interest on other borrowings 1,548 2,496 5,588 Total interest expense 15,539 12,156 12,755 Net interest income 242,686 223,922 206,203 Provision for loan losses 14,745 10,901 16,763 Net interest income after provision for loan losses 227,941 213,021 189,440 Noninterest income Fees from other financial services 18,937 22,796 22,384 Fee income on deposit liabilities 21,311 22,204 21,759 Fee income on other financial products 7,052 7,205 8,707 Bank-owned life insurance 5,057 5,539 4,637 Mortgage banking income 1,493 2,201 6,625 Gains on sale of investment securities, net — — 598 Other income, net 2,200 1,617 2,256 Total noninterest income 56,050 61,562 66,966 Noninterest expense Compensation and employee benefits 98,387 94,931 89,242 Occupancy 17,073 16,699 16,321 Data processing 14,268 13,280 13,030 Services 10,847 10,994 11,054 Equipment 7,186 7,232 6,938 Office supplies, printing and postage 6,134 6,182 6,075 Marketing 3,567 3,501 3,489 FDIC insurance 2,713 2,904 3,543 Other expense 17,238 20,144 19,362 Total noninterest expense 177,413 175,867 169,054 Income before income taxes 106,578 98,716 87,352 Income taxes 24,069 31,719 30,073 Net income $ 82,509 $ 66,997 $ 57,279 Reconciliation to amounts per HEI Consolidated Statements of Income*: Years ended December 31 2018 2017 2016 (in thousands) Interest and dividend income $ 258,225 $ 236,078 $ 218,958 Noninterest income 56,050 61,562 66,966 *Revenues-Bank 314,275 297,640 285,924 Total interest expense 15,539 12,156 12,755 Provision for loan losses 14,745 10,901 16,763 Total noninterest expense 177,413 175,867 169,054 Less: Retirement defined benefits expense—other than service costs (1,657 ) (820 ) (875 ) *Expenses-Bank 206,040 198,104 197,697 *Operating income-Bank 108,235 99,536 88,227 Add back: Retirement defined benefits expense—other than service costs 1,657 820 875 Income before income taxes $ 106,578 $ 98,716 $ 87,352
Schedule of statements of comprehensive income data	Statements of Comprehensive Income Data Years ended December 31 2018 2017 2016 (in thousands) Net income $ 82,509 $ 66,997 $ 57,279 Other comprehensive income (loss), net of taxes: Net unrealized losses on available-for sale investment securities: Net unrealized losses on available-for sale investment securities arising during the period, net of tax benefits of $3,468, $2,886 and $3,763 for 2018, 2017 and 2016, respectively (9,472 ) (4,370 ) (5,699 ) Reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil and $238 for 2018, 2017 and 2016, respectively — — (360 ) Retirement benefit plans: Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $1,108, $812 and $566 for 2018, 2017 and 2016, respectively 2,353 1,231 857 Other comprehensive loss, net of tax benefits (7,119 ) (3,139 ) (5,202 ) Comprehensive income $ 75,390 $ 63,858 $ 52,077
Schedule of balance sheets data	Balance Sheets Data December 31 2018 2017 (in thousands) Assets Cash and due from banks $ 122,059 $ 140,934 Interest-bearing deposits 4,225 93,165 Investment securities Available-for-sale, at fair value 1,388,533 1,401,198 Held-to-maturity, at amortized cost (fair value of $142,057 and $44,412 at December 31, 2018 and 2017, respectively) 141,875 44,515 Stock in Federal Home Loan Bank, at cost 9,958 9,706 Loans held for investment 4,843,021 4,670,768 Allowance for loan losses (52,119 ) (53,637 ) Net loans 4,790,902 4,617,131 Loans held for sale, at lower of cost or fair value 1,805 11,250 Other 486,347 398,570 Goodwill 82,190 82,190 Total assets $ 7,027,894 $ 6,798,659 Liabilities and shareholder’s equity Deposit liabilities–noninterest-bearing $ 1,800,727 $ 1,760,233 Deposit liabilities–interest-bearing 4,358,125 4,130,364 Other borrowings 110,040 190,859 Other 124,613 110,356 Total liabilities 6,393,505 6,191,812 Commitments and contingencies Common stock 1 1 Additional paid in capital 347,170 345,018 Retained earnings 325,286 292,957 Accumulated other comprehensive loss, net of tax benefits Net unrealized losses on securities $ (24,423 ) $ (14,951 ) Retirement benefit plans (13,645 ) (38,068 ) (16,178 ) (31,129 ) Total shareholder’s equity 634,389 606,847 Total liabilities and shareholder’s equity $ 7,027,894 $ 6,798,659 December 31 2018 2017 (in thousands) Other assets Bank-owned life insurance $ 151,172 $ 148,775 Premises and equipment, net 214,415 136,270 Accrued interest receivable 20,140 18,724 Mortgage servicing rights 8,062 8,639 Low-income housing investments 67,626 59,016 Real estate acquired in settlement of loans, net 406 133 Other 24,526 27,013 $ 486,347 $ 398,570 Other liabilities Accrued expenses $ 54,084 $ 39,312 Federal and state income taxes payable 2,012 3,736 Cashier’s checks 26,906 27,000 Advance payments by borrowers 10,183 10,245 Other 31,428 30,063 $ 124,613 $ 110,356
Schedule of the book value and aggregate fair value by major security type	The major components of investment securities were as follows: Gross unrealized losses Gross Gross Estimated Less than 12 months 12 months or longer (dollars in thousands) Amortized cost unrealized gains unrealized losses fair value Number of issues Fair value Amount Number of issues Fair value Amount December 31, 2018 Available-for-sale U.S. Treasury and federal agency obligations $ 156,694 $ 62 $ (2,407 ) $ 154,349 5 $ 25,882 $ (208 ) 19 $ 118,405 $ (2,199 ) Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,192,169 789 (31,542 ) 1,161,416 22 129,011 (1,330 ) 145 947,890 (30,212 ) Corporate bonds 49,398 103 (369 ) 49,132 6 23,175 (369 ) — — — Mortgage revenue bonds 23,636 — — 23,636 — — — — — — $ 1,421,897 $ 954 $ (34,318 ) $ 1,388,533 33 $ 178,068 $ (1,907 ) 164 $ 1,066,295 $ (32,411 ) Held-to-maturity Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies $ 141,875 $ 1,446 $ (1,264 ) $ 142,057 3 $ 29,814 $ (400 ) 2 $ 31,505 $ (864 ) $ 141,875 $ 1,446 $ (1,264 ) $ 142,057 3 $ 29,814 $ (400 ) 2 $ 31,505 $ (864 ) December 31, 2017 Available-for-sale U.S. Treasury and federal agency obligations $ 185,891 $ 438 $ (2,031 ) $ 184,298 15 $ 83,137 $ (825 ) 8 $ 62,296 $ (1,206 ) Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,220,304 793 (19,624 ) 1,201,473 67 653,635 (6,839 ) 77 459,912 (12,785 ) Mortgage revenue bond 15,427 — — 15,427 — — — — — — $ 1,421,622 $ 1,231 $ (21,655 ) $ 1,401,198 82 $ 736,772 $ (7,664 ) 85 $ 522,208 $ (13,991 ) Held-to-maturity Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies $ 44,515 $ 1 $ (104 ) $ 44,412 2 $ 35,744 $ (104 ) — $ — $ — $ 44,515 $ 1 $ (104 ) $ 44,412 2 $ 35,744 $ (104 ) — $ — $ —
Schedule of contractual maturities of available-for-sale securities	The contractual maturities of investment securities were as follows: Amortized Fair December 31, 2018 Cost value (in thousands) Available-for-sale Due in one year or less $ 20,002 $ 19,955 Due after one year through five years 117,549 116,508 Due after five years through ten years 76,750 75,227 Due after ten years 15,427 15,427 229,728 227,117 Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,192,169 1,161,416 Total available-for-sale securities $ 1,421,897 $ 1,388,533 Held-to-maturity Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies $ 141,875 $ 142,057 Total held-to-maturity securities $ 141,875 $ 142,057
Schedule of proceeds, gains and losses from sales of available for sale investment securities	The proceeds, gross gains and losses from sales of available-for-sale securities were as follows: Years ended December 31 2018 2017 2016 (in millions) Proceeds $ — $ — $ 16.4 Gross gains — — 0.6 Gross losses — — —
Schedule of interest income from available for sale investment securities	Interest income from taxable and non-taxable investment securities were as follows: Years ended December 31 2018 2017 2016 (in thousands) Taxable $ 37,153 $ 28,398 $ 19,166 Non-taxable 609 425 18 $ 37,762 $ 28,823 $ 19,184
Schedule of loans receivable	The components of loans were summarized as follows: December 31 2018 2017 (in thousands) Real estate: Residential 1-4 family $ 2,143,397 $ 2,118,047 Commercial real estate 748,398 733,106 Home equity line of credit 978,237 913,052 Residential land 13,138 15,797 Commercial construction 92,264 108,273 Residential construction 14,307 14,910 Total real estate 3,989,741 3,903,185 Commercial 587,891 544,828 Consumer 266,002 223,564 Total loans 4,843,634 4,671,577 Less: Deferred fees and discounts (613 ) (809 ) Allowance for loan losses (52,119 ) (53,637 ) Total loans, net $ 4,790,902 $ 4,617,131
Schedule of allowance for loan losses	The allowance for loan losses (balances and changes) and financing receivables were as follows: (in thousands) Residential 1-4 family Commercial Home equity Residential land Commercial construction Residential construction Commercial Consumer Total December 31, 2018 Allowance for loan losses: Beginning balance $ 2,902 $ 15,796 $ 7,522 $ 896 $ 4,671 $ 12 $ 10,851 $ 10,987 $ 53,637 Charge-offs (128 ) — (353 ) (18 ) — — (2,722 ) (17,296 ) (20,517 ) Recoveries 74 — 257 179 — — 2,136 1,608 4,254 Provision (872 ) (1,291 ) (1,055 ) (578 ) (1,881 ) (8 ) (1,040 ) 21,470 14,745 Ending balance $ 1,976 $ 14,505 $ 6,371 $ 479 $ 2,790 $ 4 $ 9,225 $ 16,769 $ 52,119 Ending balance: individually evaluated for impairment $ 876 $ 7 $ 701 $ 6 $ — $ — $ 628 $ 4 $ 2,222 Ending balance: collectively evaluated for impairment $ 1,100 $ 14,498 $ 5,670 $ 473 $ 2,790 $ 4 $ 8,597 $ 16,765 $ 49,897 Financing Receivables: Ending balance $ 2,143,397 $ 748,398 $ 978,237 $ 13,138 $ 92,264 $ 14,307 $ 587,891 $ 266,002 $ 4,843,634 Ending balance: individually evaluated for impairment $ 16,494 $ 915 $ 14,800 $ 2,059 $ — $ — $ 5,340 $ 89 $ 39,697 Ending balance: collectively evaluated for impairment $ 2,126,903 $ 747,483 $ 963,437 $ 11,079 $ 92,264 $ 14,307 $ 582,551 $ 265,913 $ 4,803,937 December 31, 2017 Allowance for loan losses: Beginning balance $ 2,873 $ 16,004 $ 5,039 $ 1,738 $ 6,449 $ 12 $ 16,618 $ 6,800 $ 55,533 Charge-offs (826 ) — (14 ) (210 ) — — (4,006 ) (11,757 ) (16,813 ) Recoveries 157 — 308 482 — — 1,852 1,217 4,016 Provision 698 (208 ) 2,189 (1,114 ) (1,778 ) — (3,613 ) 14,727 10,901 Ending balance $ 2,902 $ 15,796 $ 7,522 $ 896 $ 4,671 $ 12 $ 10,851 $ 10,987 $ 53,637 Ending balance: individually evaluated for impairment $ 1,248 $ 65 $ 647 $ 47 $ — $ — $ 694 $ 29 $ 2,730 Ending balance: collectively evaluated for impairment $ 1,654 $ 15,731 $ 6,875 $ 849 $ 4,671 $ 12 $ 10,157 $ 10,958 $ 50,907 Financing Receivables: Ending balance $ 2,118,047 $ 733,106 $ 913,052 $ 15,797 $ 108,273 $ 14,910 $ 544,828 $ 223,564 $ 4,671,577 Ending balance: individually evaluated for impairment $ 18,284 $ 1,016 $ 8,188 $ 1,265 $ — $ — $ 4,574 $ 66 $ 33,393 Ending balance: collectively evaluated for impairment $ 2,099,763 $ 732,090 $ 904,864 $ 14,532 $ 108,273 $ 14,910 $ 540,254 $ 223,498 $ 4,638,184 December 31, 2016 Allowance for loan losses: Beginning balance $ 4,186 $ 11,342 $ 7,260 $ 1,671 $ 4,461 $ 13 $ 17,208 $ 3,897 $ 50,038 Charge-offs (639 ) — (112 ) (138 ) — — (5,943 ) (7,413 ) (14,245 ) Recoveries 421 — 59 461 — — 1,093 943 2,977 Provision (1,095 ) 4,662 (2,168 ) (256 ) 1,988 (1 ) 4,260 9,373 16,763 Ending balance $ 2,873 $ 16,004 $ 5,039 $ 1,738 $ 6,449 $ 12 $ 16,618 $ 6,800 $ 55,533 Ending balance: individually evaluated for impairment $ 1,352 $ 80 $ 215 $ 789 $ — $ — $ 1,641 $ 6 $ 4,083 Ending balance: collectively evaluated for impairment $ 1,521 $ 15,924 $ 4,824 $ 949 $ 6,449 $ 12 $ 14,977 $ 6,794 $ 51,450 Financing Receivables: Ending balance $ 2,048,051 $ 800,395 $ 863,163 $ 18,889 $ 126,768 $ 16,080 $ 692,051 $ 178,222 $ 4,743,619 Ending balance: individually evaluated for impairment $ 19,854 $ 1,569 $ 6,158 $ 3,629 $ — $ — $ 20,539 $ 10 $ 51,759 Ending balance: collectively evaluated for impairment $ 2,028,197 $ 798,826 $ 857,005 $ 15,260 $ 126,768 $ 16,080 $ 671,512 $ 178,212 $ 4,691,860
Schedule of credit risk profile by internally assigned grade for loans	The credit risk profile by internally assigned grade for loans was as follows: December 31 2018 2017 (in thousands) Commercial real estate Commercial construction Commercial Total Commercial real estate Commercial construction Commercial Total Grade: Pass $ 658,288 $ 89,974 $ 547,640 $ 1,295,902 $ 630,877 $ 83,757 $ 492,942 $ 1,207,576 Special mention 32,871 — 11,598 44,469 49,347 22,500 27,997 99,844 Substandard 57,239 2,290 28,653 88,182 52,882 2,016 23,421 78,319 Doubtful — — — — — — 468 468 Loss — — — — — — — — Total $ 748,398 $ 92,264 $ 587,891 $ 1,428,553 $ 733,106 $ 108,273 $ 544,828 $ 1,386,207
Schedule of credit risk profile based on payment activity for loans	The credit risk profile based on payment activity for loans was as follows: (in thousands) 30-59 days past due 60-89 days past due Greater than 90 days Total past due Current Total financing receivables Recorded investment> 90 days and accruing December 31, 2018 Real estate: Residential 1-4 family $ 3,757 $ 2,773 $ 2,339 $ 8,869 $ 2,134,528 $ 2,143,397 $ — Commercial real estate — — — — 748,398 748,398 — Home equity line of credit 1,139 681 2,720 4,540 973,697 978,237 — Residential land 9 — 319 328 12,810 13,138 — Commercial construction — — — — 92,264 92,264 — Residential construction — — — — 14,307 14,307 — Commercial 315 281 548 1,144 586,747 587,891 — Consumer 5,220 3,166 2,702 11,088 254,914 266,002 — Total loans $ 10,440 $ 6,901 $ 8,628 $ 25,969 $ 4,817,665 $ 4,843,634 $ — December 31, 2017 Real estate: Residential 1-4 family $ 1,532 $ 1,715 $ 5,071 $ 8,318 $ 2,109,729 $ 2,118,047 $ — Commercial real estate — — — — 733,106 733,106 — Home equity line of credit 425 114 2,051 2,590 910,462 913,052 — Residential land 23 — 625 648 15,149 15,797 — Commercial construction — — — — 108,273 108,273 — Residential construction — — — — 14,910 14,910 — Commercial 1,825 2,025 730 4,580 540,248 544,828 — Consumer 3,432 2,159 1,876 7,467 216,097 223,564 — Total loans $ 7,237 $ 6,013 $ 10,353 $ 23,603 $ 4,647,974 $ 4,671,577 $ —
Schedule of credit risk profile based on nonaccrual loans, accruing loans 90 days or more past due	The credit risk profile based on nonaccrual loans, accruing loans 90 days or more past due, and TDR loans was as follows: December 31 2018 2017 (in thousands) Real estate: Residential 1-4 family $ 12,037 $ 12,598 Commercial real estate — — Home equity line of credit 6,348 4,466 Residential land 436 841 Commercial construction — — Residential construction — — Commercial 4,278 3,069 Consumer 4,196 2,617 Total nonaccrual loans $ 27,295 $ 23,591 Real estate: Residential 1-4 family $ — $ — Commercial real estate — — Home equity line of credit — — Residential land — — Commercial construction — — Residential construction — — Commercial — — Consumer — — Total accruing loans 90 days or more past due $ — $ — Real estate: Residential 1-4 family $ 10,194 $ 10,982 Commercial real estate 915 1,016 Home equity line of credit 11,597 6,584 Residential land 1,622 425 Commercial construction — — Residential construction — — Commercial 1,527 1,741 Consumer 62 66 Total troubled debt restructured loans not included above $ 25,917 $ 20,814
Schedule of the carrying amount and the total unpaid principal balance of impaired loans	The total carrying amount and the total unpaid principal balance of impaired loans were as follows: December 31 2018 2017 (in thousands) Recorded investment Unpaid principal balance Related allowance Recorded investment Unpaid principal balance Related allowance With no related allowance recorded Real estate: Residential 1-4 family $ 7,822 $ 8,333 $ — $ 9,097 $ 9,644 $ — Commercial real estate — — — — — — Home equity line of credit 2,743 3,004 — 1,496 1,789 — Residential land 2,030 2,228 — 1,143 1,434 — Commercial construction — — — — — — Residential construction — — — — — — Commercial 3,722 4,775 — 2,328 3,166 — Consumer 32 32 — 8 8 — 16,349 18,372 — 14,072 16,041 — With an allowance recorded Real estate: Residential 1-4 family 8,672 8,875 876 9,187 9,390 1,248 Commercial real estate 915 915 7 1,016 1,016 65 Home equity line of credit 12,057 12,086 701 6,692 6,736 647 Residential land 29 29 6 122 122 47 Commercial construction — — — — — — Residential construction — — — — — — Commercial 1,618 1,618 628 2,246 2,252 694 Consumer 57 57 4 58 58 29 23,348 23,580 2,222 19,321 19,574 2,730 Total Real estate: Residential 1-4 family 16,494 17,208 876 18,284 19,034 1,248 Commercial real estate 915 915 7 1,016 1,016 65 Home equity line of credit 14,800 15,090 701 8,188 8,525 647 Residential land 2,059 2,257 6 1,265 1,556 47 Commercial construction — — — — — — Residential construction — — — — — — Commercial 5,340 6,393 628 4,574 5,418 694 Consumer 89 89 4 66 66 29 $ 39,697 $ 41,952 $ 2,222 $ 33,393 $ 35,615 $ 2,730 ASB’s average recorded investment of, and interest income recognized from, impaired loans were as follows: December 31 2018 2017 2016 (in thousands) Average Interest Average Interest Average Interest With no related allowance recorded Real estate: Residential 1-4 family $ 8,595 $ 445 $ 9,440 $ 316 $ 10,136 $ 324 Commercial real estate — — 91 11 1,124 — Home equity line of credit 2,206 75 1,976 101 1,105 23 Residential land 1,532 40 1,094 117 1,518 66 Commercial construction — — — — — — Residential construction — — — — — — Commercial 3,275 28 2,776 54 8,694 370 Consumer 22 — 1 — 2 — 15,630 588 15,378 599 22,579 783 With an allowance recorded Real estate: Residential 1-4 family 8,878 363 9,818 493 11,589 457 Commercial real estate 982 42 1,241 54 1,962 15 Home equity line of credit 10,617 440 5,045 251 3,765 137 Residential land 37 3 1,308 97 2,964 206 Commercial construction — — — — — — Residential construction — — — — — — Commercial 1,789 122 3,691 723 16,106 456 Consumer 57 4 57 3 12 — 22,360 974 21,160 1,621 36,398 1,271 Total Real estate: Residential 1-4 family 17,473 808 19,258 809 21,725 781 Commercial real estate 982 42 1,332 65 3,086 15 Home equity line of credit 12,823 515 7,021 352 4,870 160 Residential land 1,569 43 2,402 214 4,482 272 Commercial construction — — — — — — Residential construction — — — — — — Commercial 5,064 150 6,467 777 24,800 826 Consumer 79 4 58 3 14 — $ 37,990 $ 1,562 $ 36,538 $ 2,220 $ 58,977 $ 2,054 * Since loan was classified as impaired.
Schedule of loan modifications	Loan modifications that occurred during 2018 , 2017 , and 2016 and the impact on the allowance for loan losses were as follows: (dollars in thousands) Number of contracts Outstanding recorded investment Net increase in ALLL Years ended Pre-modification Post-modification December 31, 2018 Real estate: Residential 1-4 family 5 $ 1,107 $ 1,133 $ 17 Commercial real estate — — — — Home equity line of credit 58 7,487 7,492 1,220 Residential land 5 1,776 1,786 — Commercial construction — — — — Residential construction — — — — Commercial 13 2,550 2,550 176 Consumer — — — — 81 $ 12,920 $ 12,961 $ 1,413 December 31, 2017 Real estate: Residential 1-4 family 7 $ 742 $ 750 $ 45 Commercial real estate — — — — Home equity line of credit 46 3,016 3,002 557 Residential land 1 92 92 — Commercial construction — — — — Residential construction — — — — Commercial 9 889 889 248 Consumer 1 59 59 27 64 $ 4,798 $ 4,792 $ 877 December 31, 2016 Real estate: Residential 1-4 family 14 $ 3,131 $ 3,245 $ 337 Commercial real estate — — — — Home equity line of credit 36 3,337 3,337 554 Residential land 2 203 204 — Commercial construction — — — — Residential construction — — — — Commercial 15 20,266 20,266 865 Consumer — — — — 67 $ 26,937 $ 27,052 $ 1,756
Schedule of loans modified in TDRS that experienced a payment default of 90 days or more, and for which payment default occurred within one year of the modification	Loans modified in TDRs that experienced a payment default of 90 days or more in 2018 , 2017 , and 2016 and for which the payment default occurred within one year of the modification, were as follows: Years ended December 31 2018 2017 2016 (dollars in thousands) Number of contracts Recorded investment Number of contracts Recorded investment Number of Recorded Troubled debt restructurings that subsequently defaulted Real estate: Residential 1-4 family — $ — 1 $ 222 1 $ 239 Commercial real estate — — — — — — Home equity line of credit 1 81 — — — — Residential land — — — — — — Commercial construction — — — — — — Residential construction — — — — — — Commercial 1 246 — — 1 24 Consumer — — — — — — 2 $ 327 1 $ 222 2 $ 263
Schedule of amortized intangible assets	Changes in the carrying value of MSRs were as follows: (in thousands) Gross 1 Accumulated amortization 1 Valuation allowance Net December 31, 2018 $ 18,556 $ (10,494 ) $ — $ 8,062 December 31, 2017 $ 17,511 $ (8,872 ) $ — $ 8,639 1 Reflects impact of loans paid in full. Changes related to MSRs were as follows: (in thousands) 2018 2017 2016 Mortgage servicing rights Balance, January 1 $ 8,639 $ 9,373 $ 8,884 Amount capitalized 1,045 1,239 2,740 Amortization (1,622 ) (1,973 ) (2,251 ) Sale of mortgage servicing rights — — — Other-than-temporary impairment — — — Carrying amount before valuation allowance, December 31 8,062 8,639 9,373 Valuation allowance for mortgage servicing rights Balance, January 1 — — — Provision (recovery) — — — Other-than-temporary impairment — — — Balance, December 31 — — — Net carrying value of mortgage servicing rights $ 8,062 $ 8,639 $ 9,373
Schedule of key assumptions used in estimating fair value	Key assumptions used in estimating the fair value of ASB’s MSRs used in the impairment analysis were as follows: December 31 2018 2017 (dollars in thousands) Unpaid principal balance $ 1,188,514 $ 1,195,454 Weighted average note rate 3.98 % 3.94 % Weighted average discount rate 10.0 % 10.0 % Weighted average prepayment speed 6.5 % 9.0 % The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis: Significant unobservable input value (1) (dollars in thousands) Fair value Valuation technique Significant unobservable input Range Weighted December 31, 2018 Home equity line of credit $ 77 Fair value of property or collateral Appraised value less 7% selling cost N/A (2) Total loans $ 77 Real estate acquired in settlement of loans $ 186 Fair value of property or collateral Appraised value less 7% selling cost N/A (2) December 31, 2017 Residential loans $ 613 Fair value of collateral Appraised value less 7% selling cost 71-92% 84% Commercial loans 2,008 Fair value of collateral Appraised value 71-76% 75% Total loans $ 2,621 (1) Represent percent of outstanding principal balance. (2) N/A - Not applicable. There is one asset in each fair value measurement type.
Schedule of sensitivity analysis of fair value of MSR to hypothetical adverse changes	The sensitivity analysis of fair value of MSRs to hypothetical adverse changes of 25 and 50 basis points in certain key assumptions was as follows: December 31 2018 2017 (in thousands) Prepayment rate: 25 basis points adverse rate change $ (250 ) $ (869 ) 50 basis points adverse rate change (566 ) (1,828 ) Discount rate: 25 basis points adverse rate change (139 ) (111 ) 50 basis points adverse rate change (275 ) (220 )
Schedule of deposit liabilities	The summarized components of deposit liabilities were as follows: December 31 2018 2017 (dollars in thousands) Weighted-average stated rate Amount Weighted-average stated rate Amount Savings 0.07 % $ 2,322,552 0.07 % $ 2,303,450 Checking Interest-bearing 0.09 1,055,019 0.03 944,833 Noninterest-bearing — 932,608 — 896,292 Commercial checking — 868,119 — 863,941 Money market 0.63 152,713 0.09 114,797 Time certificates 1.61 827,841 1.26 767,284 0.27 % $ 6,158,852 0.20 % $ 5,890,597
Schedule of maturities of term certificates	The approximate scheduled maturities of time certificates outstanding at December 31, 2018 were as follows: (in thousands) 2019 $ 508,833 2020 128,613 2021 107,095 2022 49,329 2023 30,456 Thereafter 3,515 $ 827,841
Schedule of interest expense on deposit liabilities by type	Interest expense on deposit liabilities by type of deposit was as follows: Years ended December 31 2018 2017 2016 (in thousands) Time certificates $ 11,044 $ 7,687 $ 5,390 Savings 1,639 1,567 1,402 Money market 602 168 202 Interest-bearing checking 706 238 173 $ 13,991 $ 9,660 $ 7,167
Schedule of securities sold under agreements to repurchase	Securities sold under agreements to repurchase were summarized as follows: December 31 2018 2017 Maturity Repurchase liability Weighted-average interest rate Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest Repurchase liability Weighted-average Collateralized by (dollars in thousands) Overnight $ 65,040 0.75 % $ 92,290 $ 140,859 0.65 % $ 165,464 1 to 29 days — — — — — — 30 to 90 days — — — — — — Over 90 days — — — — — — $ 65,040 0.75 % $ 92,290 $ 140,859 0.65 % $ 165,464 The following tables present information about the securities sold under agreements to repurchase, including the related collateral received from or pledged to counterparties: (in millions) Gross amount of recognized liabilities Gross amount offset in the Balance Sheets Net amount of liabilities presented in the Balance Sheets Repurchase agreements December 31, 2018 $ 65 $ — $ 65 December 31, 2017 141 — 141 Gross amount not offset in the Balance Sheets (in millions) Net amount of liabilities presented in the Balance Sheets Financial instruments Cash collateral pledged Commercial account holders December 31, 2018 $ 65 $ 92 $ — December 31, 2017 141 165 —
Schedule of securities sold under agreements to repurchase, which provided for repurchase of identical securities	Information concerning securities sold under agreements to repurchase, which provided for the repurchase of identical securities, was as follows: (dollars in millions) 2018 2017 2016 Amount outstanding as of December 31 $ 65 $ 141 $ 93 Average amount outstanding during the year $ 99 $ 98 $ 170 Maximum amount outstanding as of any month-end $ 152 $ 141 $ 229 Weighted-average interest rate as of December 31 0.75 % 0.65 % 0.23 % Weighted-average interest rate during the year 0.71 % 0.26 % 1.43 % Weighted-average remaining days to maturity as of December 31 1 1 6
Schedule of advances from Federal Home Loan Bank	FHLB advances are fixed rate for a specific term and consist of the following: December 31, 2018 Weighted-average stated rate Amount (dollars in thousands) Due in 2019 2.63 % $ 45,000 2020 — — 2021 — — 2022 — — 2023 — — Thereafter — — 2.63 % $ 45,000
Schedule of actual and minimum required capital amounts and ratios	The tables below set forth actual and minimum required capital amounts and ratios: Actual Minimum required Required to be well capitalized (dollars in thousands) Capital Ratio Capital Ratio Capital Ratio December 31, 2018 Tier 1 leverage 606,291 8.70 % 278,811 4.00 % 348,514 5.00 % Common equity tier 1 606,291 12.80 % 213,190 4.50 % 307,941 6.50 % Tier 1 capital 606,291 12.80 % 284,253 6.00 % 379,004 8.00 % Total capital 660,151 13.93 % 379,004 8.00 % 473,755 10.00 % December 31, 2017 Tier 1 leverage 571,810 8.58 % 266,430 4.00 % 333,038 5.00 % Common equity tier 1 571,810 12.95 % 198,628 4.50 % 286,907 6.50 % Tier 1 capital 571,810 12.95 % 264,838 6.00 % 353,117 8.00 % Total capital 626,987 14.20 % 353,117 8.00 % 441,396 10.00 %
Schedule of notional amounts and fair value of derivatives	The notional amount and fair value of ASB’s derivative financial instruments were as follows: December 31 2018 2017 (in thousands) Notional amount Fair value Notional amount Fair value Interest rate lock commitments $ 10,180 $ 91 $ 13,669 $ 131 Forward commitments 10,132 (43 ) 14,465 (24 )
Schedule of derivative financial instruments, fair values, and balance sheet location	ASB’s derivative financial instruments, their fair values, and balance sheet location were as follows: Derivative Financial Instruments Not Designated as Hedging Instruments 1 December 31 2018 2017 (in thousands) Asset derivatives Liability derivatives Asset derivatives Liability derivatives Interest rate lock commitments $ 91 $ — $ 133 $ 2 Forward commitments — 43 4 28 $ 91 $ 43 $ 137 $ 30 1 Asset derivatives are included in other assets and liability derivatives are included in other liabilities in the balance sheets.
Schedule of derivative financial instruments and amount and location of net gains or losses	The following table presents ASB’s derivative financial instruments and the amount and location of the net gains or losses recognized in ASB’s statements of income: Derivative Financial Instruments Not Designated Location of net gains as Hedging Instruments (losses) recognized in Years ended December 31 (in thousands) the Statements of Income 2018 2017 2016 Interest rate lock commitments Mortgage banking income $ (40 ) $ (290 ) $ 37 Forward commitments Mortgage banking income (19 ) 153 (148 ) $ (59 ) $ (137 ) $ (111 )
Schedule of off balance sheet arrangements	The following is a summary of outstanding off-balance sheet arrangements: December 31 2018 2017 (in thousands) Unfunded commitments to extend credit: Home equity line of credit $ 1,242,804 $ 1,214,103 Commercial and commercial real estate 515,058 466,510 Consumer 70,292 68,053 Residential 1-4 family 17,552 18,635 Commercial and financial standby letters of credit 13,340 13,136 Total $ 1,859,046 $ 1,780,437

Long-term debt (Tables)

Long-term debt (Tables)	12 Months Ended
	Dec. 31, 2018
Long-term Debt, Unclassified [Abstract]
Schedule of long-term debt	On May 30, 2018, the Utilities issued, through a private placement pursuant to separate Note Purchase Agreements (the Note Purchase Agreements), the following unsecured notes bearing taxable interest (the Notes): Series 2018A Series 2018B Series 2018C Aggregate principal amount $67.5 million $17.5 million $15 million Fixed coupon interest rate 4.38% 4.53% 4.72% Maturity date May 30, 2028 May 30, 2033 May 30, 2048 State of Hawaii Department of Budget and Finance loaned the proceeds to: Hawaiian Electric $52 million $12.5 million $10.5 million Hawaii Electric Light $9 million $3 million $3 million Maui Electric $6.5 million $2 million $1.5 million On October 4, 2018, HEI closed on a private placement transaction to issue $150 million senior unsecured notes in two tranches, as follows: HEI Series 2018A HEI Series 2018B Aggregate principal amount due at maturity $50 million $100 million Fixed coupon interest rate 4.58% 4.72% Maturity date December 15, 2025 December 15, 2028 Draw date October 4, 2018 December 18, 2018 December 31 2018 2017 (dollars in thousands) Long-term debt of Utilities, net of unamortized debt issuance costs 1 $ 1,418,802 $ 1,368,479 Hamakua Energy 4.02% notes, due 2030 63,438 67,325 HEI 2.99% term loan, due 2022 150,000 150,000 HEI 5.67% senior notes, due 2021 50,000 50,000 HEI 3.99% senior notes, due 2023 50,000 50,000 HEI 4.58% senior notes, due 2025 50,000 — HEI 4.72% senior notes, due 2028 100,000 — Less unamortized debt issuance costs (2,599 ) (2,007 ) $ 1,879,641 $ 1,683,797 1 See components of “Total long-term debt” and unamortized debt issuance costs in Hawaiian Electric and subsidiaries’ Consolidated Statements of Capitalization.

Shareholders' equity (Tables)

Shareholders' equity (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of accumulated other comprehensive income	Changes in the balances of each component of accumulated other comprehensive income/(loss) (AOCI) were as follows: HEI Consolidated Hawaiian Electric Consolidated (in thousands) Net unrealized gains (losses) on securities Unrealized gains (losses) on derivatives Retirement benefit plans AOCI Unrealized gains (losses) on derivatives Retirement benefit plans AOCI Balance, December 31, 2015 $ (1,872 ) $ (54 ) $ (24,336 ) $ (26,262 ) $ — $ 925 $ 925 Current period other comprehensive loss, net of taxes (6,059 ) (400 ) (408 ) (6,867 ) (454 ) (793 ) (1,247 ) Balance, December 31, 2016 (7,931 ) (454 ) (24,744 ) (33,129 ) (454 ) 132 (322 ) Current period other comprehensive income (loss), net of taxes (4,370 ) 454 2,544 (1,372 ) 454 (1,142 ) (688 ) Reclass of AOCI for tax rate reduction impact (2,650 ) — (4,790 ) (7,440 ) — (209 ) (209 ) Balance, December 31, 2017 (14,951 ) — (26,990 ) (41,941 ) — (1,219 ) (1,219 ) Current period other comprehensive income (loss), net of taxes (9,472 ) (436 ) 1,239 (8,669 ) — 1,318 1,318 Balance, December 31, 2018 $ (24,423 ) $ (436 ) $ (25,751 ) $ (50,610 ) $ — $ 99 $ 99
Reclassification Out of Accumulated Other Comprehensive Income	Reclassifications out of AOCI were as follows: Amount reclassified from AOCI Affected line item in the Statement of Years ended December 31 2018 2017 2016 Income/Balance Sheet (in thousands) HEI consolidated Net realized gains on securities included in net income $ — $ — $ (360 ) Revenues-bank (gains on sale of investment securities, net) Derivatives qualifying as cash flow hedges: Window forward contracts — 454 (173 ) Property, plant and equipment-electric utilities (2017); Revenues-electric utilities (gains on window forward contracts (2016) Interest rate contracts (settled in 2011) — — 54 Interest expense Retirement benefit plans: Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost 21,015 15,737 14,518 See Note 9 for additional details Impact of D&Os of the PUC included in regulatory assets 8,325 (78,724 ) 28,584 See Note 9 for additional details Total reclassifications $ 29,340 $ (62,533 ) $ 42,623 Hawaiian Electric consolidated Derivatives qualifying as cash flow hedges Window forward contracts $ — $ 454 $ (173 ) Property, plant and equipment (2017); Revenues (gains on window forward contracts (2016)) Retirement benefit plans: Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost 19,012 14,477 13,254 See Note 9 for additional details Impact of D&Os of the PUC included in regulatory assets 8,325 (78,724 ) 28,584 See Note 9 for additional details Total reclassifications $ 27,337 $ (63,793 ) $ 41,665

Revenues (Tables)

Revenues (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of revenue	The following tables disaggregate revenues by major source, timing of revenue recognition, and segment: Year ended December 31, 2018 (in thousands) Electric utility Bank Other Total Revenues from contracts with customers Electric energy sales - residential $ 801,846 $ — $ — $ 801,846 Electric energy sales - commercial 853,672 — — 853,672 Electric energy sales - large light and power 894,770 — — 894,770 Electric energy sales - other 17,243 — — 17,243 Bank fees — 47,300 — 47,300 Total revenues from contracts with customers 2,567,531 47,300 — 2,614,831 Revenues from other sources Regulatory revenue (37,687 ) — — (37,687 ) Bank interest and dividend income — 258,225 — 258,225 Other bank noninterest income — 8,750 — 8,750 Other 16,681 — 49 16,730 Total revenues from other sources (21,006 ) 266,975 49 246,018 Total revenues $ 2,546,525 $ 314,275 $ 49 $ 2,860,849 Timing of revenue recognition Services/goods transferred at a point in time $ — $ 47,300 $ — $ 47,300 Services/goods transferred over time 2,567,531 — — 2,567,531 Total revenues from contracts with customers $ 2,567,531 $ 47,300 $ — $ 2,614,831

Retirement benefits (Tables)

Retirement benefits (Tables)	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Schedule of changes in the obligations and assets of the Company's retirement benefit plans and the changes in AOCI (gross) and the funded status	The changes in the obligations and assets of the Company’s and Utilities’ retirement benefit plans and the changes in AOCI (gross) for 2018 and 2017 and the funded status of these plans and amounts related to these plans reflected in the Company’s and Utilities’ consolidated balance sheet as of December 31, 2018 and 2017 were as follows: 2018 2017 (in thousands) Pension benefits Other benefits Pension benefits Other benefits HEI consolidated Benefit obligation, January 1 $ 2,094,356 $ 212,601 $ 1,935,494 $ 233,835 Service cost 68,987 2,721 64,906 3,374 Interest cost 77,374 7,933 81,185 9,453 Actuarial losses (gains) (171,226 ) (25,977 ) 87,399 (25,557 ) Participants contributions — 2,505 — 2,078 Benefits paid and expenses (78,107 ) (11,117 ) (74,628 ) (10,582 ) Benefit obligation, December 31 1,991,384 188,666 2,094,356 212,601 Fair value of plan assets, January 1 1,618,703 193,995 1,369,701 174,251 Actual return on plan assets (101,406 ) (11,846 ) 255,324 28,248 Employer contributions 38,496 — 66,983 — Participants contributions — 2,505 — 2,078 Benefits paid and expenses (76,726 ) (10,961 ) (73,305 ) (10,582 ) Fair value of plan assets, December 31 1,479,067 173,693 1,618,703 193,995 Accrued benefit asset (liability), December 31 $ (512,317 ) $ (14,973 ) $ (475,653 ) $ (18,606 ) Other assets $ 10,930 $ — $ 15,443 $ — Defined benefit pension and other postretirement benefit plans liability (523,247 ) (14,973 ) (491,096 ) (18,606 ) Accrued benefit asset (liability), December 31 $ (512,317 ) $ (14,973 ) $ (475,653 ) $ (18,606 ) AOCI debit, January 1 (excluding impact of PUC D&Os) $ 527,830 $ 1,474 $ 619,451 $ 42,290 Recognized during year – prior service credit 42 1,805 55 1,793 Recognized during year – net actuarial losses (30,084 ) (95 ) (26,496 ) (1,130 ) Occurring during year – net actuarial losses (gains) 39,132 (1,222 ) (65,180 ) (41,479 ) AOCI debit before cumulative impact of PUC D&Os, December 31 536,920 1,962 527,830 1,474 Cumulative impact of PUC D&Os (498,944 ) (4,929 ) (489,894 ) (2,767 ) AOCI debit/(credit), December 31 $ 37,976 $ (2,967 ) $ 37,936 $ (1,293 ) Net actuarial loss $ 536,954 $ 8,865 $ 527,907 $ 10,183 Prior service gain (34 ) (6,903 ) (77 ) (8,709 ) AOCI debit before cumulative impact of PUC D&Os, December 31 536,920 1,962 527,830 1,474 Cumulative impact of PUC D&Os (498,944 ) (4,929 ) (489,894 ) (2,767 ) AOCI debit/(credit), December 31 37,976 (2,967 ) 37,936 (1,293 ) Income taxes (benefits) (10,023 ) 765 (9,986 ) 333 AOCI debit/(credit), net of taxes (benefits), December 31 $ 27,953 $ (2,202 ) $ 27,950 $ (960 ) As of December 31, 2018 and 2017, the other postretirement benefit plans shown in the table above had ABOs in excess of plan assets. 2018 2017 (in thousands) Pension benefits Other benefits Pension benefits Other benefits Hawaiian Electric consolidated Benefit obligation, January 1 $ 1,928,648 $ 204,644 $ 1,779,626 $ 225,723 Service cost 67,359 2,704 63,059 3,353 Interest cost 71,294 7,628 74,632 9,115 Actuarial losses (gains) (158,258 ) (25,330 ) 80,186 (25,172 ) Participants contributions — 2,472 — 2,047 Benefits paid and expenses (71,535 ) (10,958 ) (68,691 ) (10,419 ) Transfers 145 2 (164 ) (3 ) Benefit obligation, December 31 1,837,653 181,162 1,928,648 204,644 Fair value of plan assets, January 1 1,468,403 190,814 1,233,184 171,383 Actual return on plan assets (91,836 ) (11,625 ) 237,830 27,806 Employer contributions 37,550 — 65,669 — Participants contributions — 2,472 — 2,047 Benefits paid and expenses (71,060 ) (10,801 ) (68,225 ) (10,419 ) Other 56 2 (55 ) (3 ) Fair value of plan assets, December 31 1,343,113 170,862 1,468,403 190,814 Accrued benefit liability, December 31 $ (494,540 ) $ (10,300 ) $ (460,245 ) $ (13,830 ) Other liabilities (short-term) (512 ) (669 ) (494 ) (633 ) Defined benefit pension and other postretirement benefit plans liability (494,028 ) (9,631 ) (459,751 ) (13,197 ) Accrued benefit liability, December 31 $ (494,540 ) $ (10,300 ) $ (460,245 ) $ (13,830 ) AOCI debit, January 1 (excluding impact of PUC D&Os) $ 493,464 $ 839 $ 579,725 $ 40,967 Recognized during year – prior service credit (cost) (8 ) 1,803 (8 ) 1,804 Recognized during year – net actuarial losses (27,302 ) (98 ) (24,392 ) (1,102 ) Occurring during year – net actuarial losses (gains) 36,035 (993 ) (61,861 ) (40,830 ) AOCI debit before cumulative impact of PUC D&Os, December 31 502,189 1,551 493,464 839 Cumulative impact of PUC D&Os (498,944 ) (4,929 ) (489,894 ) (2,767 ) AOCI debit/(credit), December 31 $ 3,245 $ (3,378 ) $ 3,570 $ (1,928 ) Net actuarial loss $ 502,173 $ 8,439 $ 493,439 $ 9,531 Prior service cost (gain) 16 (6,888 ) 25 (8,692 ) AOCI debit before cumulative impact of PUC D&Os, December 31 502,189 1,551 493,464 839 Cumulative impact of PUC D&Os (498,944 ) (4,929 ) (489,894 ) (2,767 ) AOCI debit/(credit), December 31 3,245 (3,378 ) 3,570 (1,928 ) Income taxes (benefits) (836 ) 870 (920 ) 497 AOCI debit/(credit), net of taxes (benefits), December 31 $ 2,409 $ (2,508 ) $ 2,650 $ (1,431 )
Schedule of weighted-average asset allocation of defined benefit retirement plans	The asset allocation of defined benefit retirement plans to equity and fixed income securities (excluding cash) and related investment policy targets and ranges were as follows: Pension benefits 1 Other benefits 2 Investment policy Investment policy December 31 2018 2017 Target Range 2018 2017 Target Range Assets held by category Equity securities 69 % 73 % 70 % 65-75 70 % 73 % 70 % 65-75 Fixed income securities 31 27 30 25-35 30 27 30 25-35 100 % 100 % 100 % 100 % 100 % 100 % 1 Asset allocation is applicable to only HEI and the Utilities. As of December 31, 2018 and 2017 , nearly all of ASB’s pension assets were invested in fixed income securities. 2 Asset allocation is applicable to only HEI and the Utilities. ASB does not fund its other benefits.
Schedule of assets held in various trusts are measured at fair value on a recurring basis	Assets held in various trusts for the retirement benefit plans are measured at fair value on a recurring basis and were as follows: Pension benefits Other benefits Fair value measurements using Fair value measurements using (in millions) December 31 Quoted prices in active markets for identical assets Significant other observable inputs Significant unobservable inputs December 31 Level 1 Level 2 Level 3 2018 Equity securities $ 507 $ 507 $ — $ — $ 65 $ 65 $ — $ — Equity index and exchange-traded funds 348 348 — — 42 42 — — Equity investments at net asset value (NAV) 65 — — — 10 — — — Total equity investments 920 855 — — 117 107 — — Fixed income securities and public mutual funds 310 123 187 — 47 45 2 — Fixed income investments at NAV 208 — — — 4 — — — Total fixed income investments 518 123 187 — 51 45 2 — Cash equivalents at NAV 36 — — — 5 — — — Total 1,474 $ 978 $ 187 $ — 173 $ 152 $ 2 $ — Cash, receivables and payables, net 5 1 Fair value of plan assets $ 1,479 $ 174 2017 Equity securities $ 568 $ 568 $ — $ — $ 75 $ 75 $ — $ — Equity index and exchange-traded funds 435 435 — — 52 52 — — Equity investments at NAV 76 — — — 12 — — — Total equity investments 1,079 1,003 — — 139 127 — — Fixed income securities and public mutual funds 297 81 216 — 46 43 3 — Fixed income investments at NAV 203 — — — 4 — — — Total fixed income investments 500 81 216 — 50 43 3 — Cash equivalents at NAV 36 — — — 5 — — — Total 1,615 $ 1,084 $ 216 $ — 194 $ 170 $ 3 $ — Cash, receivables and payables, net 4 — Fair value of plan assets $ 1,619 $ 194 Pension benefits Other benefits Measured at net asset value December 31 Redemption frequency Redemption notice period December 31 Redemption frequency Redemption notice period (in millions) 2018 Non U.S. equity funds (a) $ 65 Daily-Monthly 5 - 30 days $ 10 Daily-Monthly 5-30 days Fixed income investments (b) 208 Monthly 15 days 4 Monthly 15 days Cash equivalents (c) 36 Daily 0-1 day 5 Daily 0-1 day $ 309 $ 19 2017 Non U.S. equity funds (a) $ 76 Daily-Monthly 5 - 30 days $ 12 Daily-Monthly 5-30 days Fixed income investments (b) 203 Monthly 15 days 4 Monthly 15 days Cash equivalents (c) 36 Daily 0-1 day 5 Daily 0-1 day $ 315 $ 21 None of the investments presented in the tables above have unfunded commitments. (a) Represents investments in funds that primarily invest in non-U.S., emerging markets equities. Redemption frequency for pension benefits assets as of December 31, 2018 and 2017 both were: daily, 32% and monthly, 68% . Redemption frequency for other benefits assets as of December 31, 2018 were: daily, 27% and monthly, 73% and as of December 31, 2017 were: daily, 26% and monthly, 74% . (b ) Represents investments in fixed income securities invested in a US-dollar denominated fund that seeks to exceed the Barclays Capital Long Corporate A or better Index through investments in US-dollar denominated fixed income securities and commingled vehicles. (c) Represents investments in cash equivalent funds. This class includes funds that invest primarily in securities issued or guaranteed by the U.S. government or its agencies or instrumentalities. For pension benefits, the fund may also invest in fixed income securities of investment grade issuers
Schedule of weighted-average assumptions used in accounting for plans	The following weighted-average assumptions were used in the accounting for the plans: Pension benefits Other benefits December 31 2018 2017 2016 2018 2017 2016 Benefit obligation Discount rate 4.31 % 3.74 % 4.26 % 4.34 % 3.72 % 4.22 % Rate of compensation increase 3.50 3.50 3.50 NA NA NA Net periodic pension/benefit cost (years ended) Discount rate 3.74 4.26 4.60 3.72 4.22 4.57 Expected return on plan assets 1 7.50 7.50 7.75 7.50 7.50 7.75 Rate of compensation increase 2 3.50 3.50 3.50 NA NA NA NA Not applicable 1 HEI’s and Utilities’ plan assets only. For 2018, 2017 and 2016, ASB’s expected return on plan assets was 3.94% , 4.46% and 4.80% , respectively. 2 The Company and the Utilities use a graded rate of compensation increase assumption based on age. The rate provided above is an average across all future years of service for the current population.
Schedule of components of net periodic benefit cost for consolidated HEI	The components of NPPC and NPBC were as follows: Pension benefits Other benefits (in thousands) 2018 2017 2016 2018 2017 2016 HEI consolidated Service cost $ 68,987 $ 64,906 $ 60,555 $ 2,721 $ 3,374 $ 3,331 Interest cost 77,374 81,185 81,549 7,933 9,453 9,670 Expected return on plan assets (108,953 ) (102,745 ) (98,559 ) (12,908 ) (12,326 ) (12,273 ) Amortization of net prior service (gain) cost (42 ) (55 ) (57 ) (1,805 ) (1,793 ) (1,793 ) Amortization of net actuarial losses 30,084 26,496 24,832 95 1,130 804 Net periodic pension/benefit cost 67,450 69,787 68,320 (3,964 ) (162 ) (261 ) Impact of PUC D&Os 25,828 (18,004 ) (18,117 ) 3,842 1,211 1,343 Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ 93,278 $ 51,783 $ 50,203 $ (122 ) $ 1,049 $ 1,082 Hawaiian Electric consolidated Service cost $ 67,359 $ 63,059 $ 58,796 $ 2,704 $ 3,353 $ 3,284 Interest cost 71,294 74,632 74,808 7,628 9,115 9,337 Expected return on plan assets (102,368 ) (95,892 ) (91,633 ) (12,713 ) (12,147 ) (12,096 ) Amortization of net prior service (gain) cost 8 8 13 (1,803 ) (1,804 ) (1,803 ) Amortization of net actuarial losses 27,302 24,392 22,693 98 1,102 793 Net periodic pension/benefit cost 63,595 66,199 64,677 (4,086 ) (381 ) (485 ) Impact of PUC D&Os 25,828 (18,004 ) (18,117 ) 3,842 1,211 1,343 Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ 89,423 $ 48,195 $ 46,560 $ (244 ) $ 830 $ 858
Schedule of amounts in accumulated other comprehensive Income (loss) to be recognized over next fiscal year	The estimated prior service credit and net actuarial loss for defined benefit plans that will be amortized from AOCI or regulatory assets into NPPC and NPBC during 2019 is as follows: HEI consolidated Hawaiian Electric consolidated (in millions) Pension benefits Other benefits Pension benefits Other benefits Estimated prior service credit $ — $ (1.8 ) $ — $ (1.8 ) Net actuarial loss 15.4 — 14.3 —
Schedule of projected benefit obligations and assets	Additional information on the defined benefit pension plans’ accumulated benefit obligations (ABOs), which do not consider projected pay increases (unlike the PBOs shown in the table above), PBOs and assets were as follows: HEI consolidated Hawaiian Electric consolidated December 31 2018 2017 2018 2017 (in billions) Defined benefit plans - ABOs $ 1.7 $ 1.8 $ 1.6 $ 1.7 Defined benefit plans with ABO in excess of plan assets ABOs 1.6 1.7 1.6 1.7 Plan assets 1.4 1.5 1.3 1.5 Defined benefit plans with PBOs in excess of plan assets PBOs 1.9 2.0 1.8 1.9 Plan assets 1.4 1.5 1.3 1.5

Share-based compensation (Table

Share-based compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of share-based compensation expense and related income tax benefit	Share-based compensation expense and the related income tax benefit were as follows: (in millions) 2018 2017 2016 HEI consolidated Share-based compensation expense 1 $ 7.8 $ 5.4 $ 4.8 Income tax benefit 1.1 1.9 1.6 Hawaiian Electric consolidated Share-based compensation expense 1 2.7 1.9 1.4 Income tax benefit 0.5 0.7 0.5 1 For 2018, 2017 and 2016, the Company has not capitalized any share-based compensation.
Schedule of common stock granted to nonemployee directors	HEI granted HEI common stock to nonemployee directors of HEI, Hawaiian Electric and ASB under the 2011 Director Plan as follows: (dollars in millions) 2018 2017 2016 Shares granted 38,821 35,770 19,846 Fair value $ 1.3 $ 1.2 $ 0.6 Income tax benefit 0.3 0.5 0.2
Schedule of restricted stock units	Information about HEI’s grants of restricted stock units was as follows: 2018 2017 2016 Shares (1) Shares (1) Shares (1) Outstanding, January 1 197,047 $ 31.53 220,683 $ 29.57 210,634 $ 28.82 Granted 93,853 34.12 97,873 33.47 114,431 29.70 Vested (75,683 ) 30.56 (92,147 ) 28.88 (85,003 ) 27.84 Forfeited (14,859 ) 32.35 (29,362 ) 31.57 (19,379 ) 29.82 Outstanding, December 31 200,358 $ 33.05 197,047 $ 31.53 220,683 $ 29.57 Total weighted-average grant-date fair value of shares granted (in millions) $ 3.2 $ 3.3 $ 3.4 (1) Weighted-average grant-date fair value per share based on the average price of HEI common stock on the date of grant.
Schedule of long-term incentive plan (LTIP) linked to total return to shareholders	Information about HEI’s LTIP grants linked to TSR was as follows: 2018 2017 2016 Shares (1) Shares (1) Shares (1) Outstanding, January 1 32,904 $ 39.51 83,106 $ 22.95 162,500 $ 27.66 Granted 37,832 38.21 37,204 39.51 — — Vested (issued or unissued and cancelled) — — (83,106 ) 22.95 (78,553 ) 32.69 Forfeited (5,158 ) 38.84 (4,300 ) 39.51 (841 ) 22.95 Outstanding, December 31 65,578 $ 38.81 32,904 $ 39.51 83,106 $ 22.95 Total weighted-average grant-date fair value of shares granted (in millions) $ 1.4 $ 1.5 $ — (1) Weighted-average grant-date fair value per share determined using a Monte Carlo simulation model.
Schedule of assumptions used to determine the fair value of Long-Term Incentive Plan (LTIP) linked to total return to shareholders (TRS)	The following table summarizes the assumptions used to determine the fair value of the LTIP awards linked to TSR and the resulting fair value of LTIP awards granted: 2018 2017 Risk-free interest rate 2.29 % 1.46 % Expected life in years 3 3 Expected volatility 17.0 % 20.1 % Range of expected volatility for Peer Group 15.1% to 26.2% 15.4% to 26.0% Grant date fair value (per share) $ 38.20 $ 39.51
Schedule of long-term incentive plan (LTIP) linked to other performance conditions	Information about HEI’s LTIP awards payable in shares linked to other performance conditions was as follows: 2018 2017 2016 Shares (1) Shares (1) Shares (1) Outstanding, January 1 131,616 $ 33.47 109,816 $ 25.18 222,647 $ 26.02 Granted 151,328 34.12 148,818 33.47 — — Vested — — (109,816 ) 25.18 (109,097 ) 26.89 Increase above target (cancelled) 13,858 33.49 — — (1,989 ) 25.26 Forfeited (20,633 ) 33.80 (17,202 ) 33.48 (1,745 ) 25.19 Outstanding, December 31 276,169 $ 33.80 131,616 $ 33.47 109,816 $ 25.18 Total weighted-average grant-date fair value of shares granted (at target performance levels) (in millions) $ 5.2 $ 5.0 $ — (1) Weighted-average grant-date fair value per share based on the average price of HEI common stock on the date of grant.

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Components of income taxes attributable to net income for common stock	The components of income taxes attributable to net income for common stock were as follows: HEI consolidated Hawaiian Electric consolidated Years ended December 31 2018 2017 2016 2018 2017 2016 (in thousands) Federal Current $ 42,903 $ 61,534 $ 59,873 $ 29,649 $ 36,267 $ 952 Deferred* (6,099 ) 33,967 43,666 (5,245 ) 35,229 70,513 Deferred tax credits, net (12 ) (20 ) 268 (12 ) (20 ) 268 36,792 95,481 103,807 24,392 71,476 71,733 State Current 17,361 10,076 16,473 13,210 8,947 9,232 Deferred (3,269 ) 3,868 3,452 (2,737 ) 2,808 3,873 Deferred tax credits, net (87 ) (32 ) (37 ) (87 ) (32 ) (37 ) 14,005 13,912 19,888 10,386 11,723 13,068 Total $ 50,797 $ 109,393 $ 123,695 $ 34,778 $ 83,199 $ 84,801 * The 2018 deferred income tax expense includes the final adjustment to reduce the provisional amount recorded in 2017 pursuant to Staff Accounting Bulletin No. 118 (SAB No. 118). See SAB No. 118 disclosure below for details of the accounting for the enactment of the Tax Act.
Schedule of reconciliation of amount of income taxes computed at federal statutory rate	A reconciliation of the amount of income taxes computed at the federal statutory rate to the amount provided in the consolidated statements of income was as follows: HEI consolidated Hawaiian Electric consolidated Years ended December 31 2018 2017 2016 2018 2017 2016 (in thousands) Amount at the federal statutory income tax rate $ 53,437 $ 96,796 $ 130,844 $ 37,889 $ 71,801 $ 80,190 Increase (decrease) resulting from: State income taxes, net of federal income tax benefit 11,832 9,789 13,915 8,080 7,584 8,494 Net deferred tax asset (liability) adjustment related to the Tax Act (9,540 ) 13,420 — (9,285 ) 9,168 — Other, net (4,932 ) (10,612 ) (21,064 ) (1,906 ) (5,354 ) (3,883 ) Total $ 50,797 $ 109,393 $ 123,695 $ 34,778 $ 83,199 $ 84,801 Effective income tax rate 20.0 % 39.6 % 33.1 % 19.3 % 40.6 % 37.0 %
Schedule of deferred tax assets and liabilities	The tax effects of book and tax basis differences that give rise to deferred tax assets and liabilities were as follows: HEI consolidated Hawaiian Electric consolidated December 31 2018 2017 2018 2017 (in thousands) Deferred tax assets Regulatory liabilities, excluding amounts attributable to property, plant and equipment $ 104,868 $ 104,984 $ 104,868 $ 104,984 Allowance for bad debts 14,647 16,192 659 1,812 Other 46,036 24,397 26,522 11,253 Total deferred tax assets 165,551 145,573 132,049 118,049 Deferred tax liabilities Property, plant and equipment related 437,644 415,452 434,831 413,891 Regulatory assets, excluding amounts attributable to property, plant and equipment 37,345 38,314 37,345 38,314 Deferred RAM and RBA revenues 11,278 15,038 11,278 15,038 Retirement benefits 20,173 32,952 25,430 38,020 Other 31,629 32,247 6,362 6,827 Total deferred tax liabilities 538,069 534,003 515,246 512,090 Net deferred income tax liability $ 372,518 $ 388,430 $ 383,197 $ 394,041
Schedule of changes in total unrecognized tax benefits	The following is a reconciliation of the Company’s liability for unrecognized tax benefits for 2018 , 2017 and 2016 . HEI consolidated Hawaiian Electric consolidated (in millions) 2018 2017 2016 2018 2017 2016 Unrecognized tax benefits, January 1 $ 4.0 $ 3.8 $ 3.6 $ 3.5 $ 3.8 3.6 Additions based on tax positions taken during the year 0.3 0.9 — 0.3 0.4 — Reductions based on tax positions taken during the year — (0.2 ) (0.1 ) — (0.2 ) (0.1 ) Additions for tax positions of prior years 0.1 — 0.3 0.1 — 0.3 Reductions for tax positions of prior years (0.1 ) (0.5 ) — (0.1 ) (0.5 ) — Lapses of statute of limitations (2.2 ) — — (2.2 ) — — Unrecognized tax benefits, December 31 $ 2.1 $ 4.0 $ 3.8 $ 1.6 $ 3.5 $ 3.8

Cash flows (Tables)

Cash flows (Tables)	12 Months Ended
	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Schedule of supplemental disclosures of cash and noncash activity	Years ended December 31 2018 2017 2016 (in millions) Supplemental disclosures of cash flow information HEI consolidated Interest paid to non-affiliates, net of amounts capitalized $ 102 $ 83 $ 84 Income taxes paid (including refundable credits) 72 55 55 Income taxes refunded (including refundable credits) 34 1 45 Hawaiian Electric consolidated Interest paid to non-affiliates, net of amounts capitalized 73 63 62 Income taxes paid (including refundable credits) 64 26 1 Income taxes refunded (including refundable credits) 31 — 20 Supplemental disclosures of noncash activities HEI consolidated Property, plant and equipment Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 59 38 84 Common stock dividends reinvested in HEI common stock (financing) 1 — — 17 Loans transferred from held for investment to held for sale (investing) 1 41 24 Real estate acquired in settlement of loans (investing) — — 1 Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) — — 1 Common stock issued (gross) for director and executive/management compensation (financing) 2 4 11 7 Obligations to fund low income housing investments, net (investing) 12 13 — Transfer of retail repurchase agreements to deposit liabilities (financing) 102 — — Hawaiian Electric consolidated Electric utility property, plant and equipment Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 44 38 84 HEI Consolidated and Hawaiian Electric consolidated Electric utility property, plant and equipment Estimated fair value of noncash contributions in aid of construction (investing) 14 18 28 Acquisition of Hawaiian Telcom’s interest in joint poles (investing) 48 — — 1 The amounts shown represents common stock dividends reinvested in HEI common stock under the HEI DRIP in noncash transactions. 2 The amounts shown represent the market value of common stock issued for director and executive/management compensation and withheld to satisfy statutory tax liabilities.

Fair value measurements (Tables

Fair value measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of estimated fair values of certain of the Company's financial instruments	The following table presents the carrying or notional amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments. For stock in Federal Home Loan Bank, the carrying amount is a reasonable estimate of fair value because it can only be redeemed at par. Estimated fair value (in thousands) Carrying or notional amount Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs Total December 31, 2018 Financial assets HEI consolidated Available-for-sale investment securities $ 1,388,533 $ — $ 1,364,897 $ 23,636 $ 1,388,533 Held-to-maturity investment securities 141,875 — 142,057 — 142,057 Stock in Federal Home Loan Bank 9,958 — 9,958 — 9,958 Loans, net 4,792,707 — 1,809 4,800,244 4,802,053 Mortgage servicing rights 8,062 — — 13,618 13,618 Derivative assets 10,180 — 91 — 91 Financial liabilities HEI consolidated Deposit liabilities 1 827,841 — 817,667 — 817,667 Short-term borrowings—other than bank 73,992 — 73,992 — 73,992 Other bank borrowings 110,040 — 110,037 — 110,037 Long-term debt, net—other than bank 1,879,641 — 1,904,261 — 1,904,261 Derivative liabilities 34,132 34 596 — 630 Hawaiian Electric consolidated Short-term borrowings 25,000 — 25,000 — 25,000 Long-term debt, net 1,418,802 — 1,443,968 — 1,443,968 December 31, 2017 Financial assets HEI consolidated Available-for-sale investment securities $ 1,401,198 $ — $ 1,385,771 $ 15,427 $ 1,401,198 Held-to-maturity investment securities 44,515 — 44,412 — 44,412 Stock in Federal Home Loan Bank 9,706 — 9,706 — 9,706 Loans, net 4,628,381 — 11,254 4,770,497 4,781,751 Mortgage servicing rights 8,639 — — 12,052 12,052 Derivative assets 17,812 — 393 — 393 Hawaiian Electric consolidated Derivative assets-window forward contracts 3,240 — 256 — 256 Financial liabilities HEI consolidated Deposit liabilities 1 5,890,597 — 5,884,071 — 5,884,071 Short-term borrowings—other than bank 117,945 — 117,945 — 117,945 Other bank borrowings 190,859 — 190,829 — 190,829 Long-term debt, net—other than bank 1,683,797 — 1,813,295 — 1,813,295 Derivative liabilities 13,562 20 10 — 30 Hawaiian Electric consolidated Short-term borrowings 4,999 — 4,999 — 4,999 Long-term debt, net 1,368,479 — 1,497,079 — 1,497,079 1 As of December 31, 2018, deposit liabilities include only fixed-maturity certificates of deposit as a result of the Company’s adoption of ASU No. 2016-01 in the first quarter of 2018. As of December 31, 2017, deposit liabilities include noninterest-bearing demand, interest-bearing demand, and savings and money market deposits, for which the carrying amount represents a reasonable estimate of fair value, as such liabilities have no stated maturity.
Schedule of assets and liabilities measured at fair value on a recurring basis	Assets and liabilities measured at fair value on a recurring basis were as follows: December 31 2018 2017 Fair value measurements using Fair value measurements using (in thousands) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Available-for-sale investment securities (bank segment) Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies $ — $ 1,161,416 $ — $ — $ 1,201,473 $ — U.S. Treasury and federal agency obligations — 154,349 — — 184,298 — Corporate bonds — 49,132 — — — — Mortgage revenue bonds — — 23,636 — — 15,427 $ — $ 1,364,897 $ 23,636 $ — $ 1,385,771 $ 15,427 Derivative assets Interest rate lock commitments (bank segment) 1 $ — $ 91 $ — $ — $ 133 $ — Forward commitments (bank segment) 1 — — — — 4 — Window forward contracts (electric utility segment) 2 — — — — 256 — $ — $ 91 $ — $ — $ 393 $ — Derivative liabilities Interest rate lock commitments (bank segment) 1 $ — $ — $ — $ — $ 2 $ — Forward commitments (bank segment) 1 34 9 — 20 8 — Interest rate swap (Other segment) 3 — 587 — — — — $ 34 $ 596 $ — $ 20 $ 10 $ — 1 Derivatives are carried at fair value in other assets or other liabilities in the balance sheets with changes in value included in mortgage banking income. 2 Derivatives were included in regulatory assets and/or liabilities in the balance sheets in 2017. 3 Derivatives are included in Other liabilities in the balance sheets.
Schedule of Level 3 assets and liabilities measured at fair value on a recurring basis	The changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows: (in thousands) 2018 2017 Mortgage revenue bonds Balance, January 1 $ 15,427 $ 15,427 Principal payments received — — Purchases 8,209 — Unrealized gain (loss) included in other comprehensive income — — Balance, December 31 $ 23,636 $ 15,427
Schedule of assets measured at fair value on a nonrecurring basis	The carrying value of assets measured at fair value on a nonrecurring basis were as follows: Fair value measurements using (in thousands) Balance Level 1 Level 2 Level 3 December 31, 2018 Loans $ 77 $ — $ — $ 77 Real estate acquired in settlement of loans 186 — — 186 December 31, 2017 Loans 2,621 — — 2,621
Schedule of significant unobservable inputs used in the fair value measurement	Key assumptions used in estimating the fair value of ASB’s MSRs used in the impairment analysis were as follows: December 31 2018 2017 (dollars in thousands) Unpaid principal balance $ 1,188,514 $ 1,195,454 Weighted average note rate 3.98 % 3.94 % Weighted average discount rate 10.0 % 10.0 % Weighted average prepayment speed 6.5 % 9.0 % The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis: Significant unobservable input value (1) (dollars in thousands) Fair value Valuation technique Significant unobservable input Range Weighted December 31, 2018 Home equity line of credit $ 77 Fair value of property or collateral Appraised value less 7% selling cost N/A (2) Total loans $ 77 Real estate acquired in settlement of loans $ 186 Fair value of property or collateral Appraised value less 7% selling cost N/A (2) December 31, 2017 Residential loans $ 613 Fair value of collateral Appraised value less 7% selling cost 71-92% 84% Commercial loans 2,008 Fair value of collateral Appraised value 71-76% 75% Total loans $ 2,621 (1) Represent percent of outstanding principal balance. (2) N/A - Not applicable. There is one asset in each fair value measurement type.

Quarterly information (unaudi_2

Quarterly information (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Schedule of selected quarterly information	Selected quarterly information was as follows: Quarters ended Years ended (in thousands, except per share amounts) March 31 June 30 Sept. 30 Dec. 31 December 31 HEI consolidated 2018 Revenues $ 645,874 $ 685,277 $ 768,048 $ 761,650 $ 2,860,849 Operating income 1 71,889 78,799 98,064 84,604 333,356 Net income 40,720 46,527 66,371 50,046 203,664 Net income for common stock 40,247 46,054 65,900 49,573 201,774 Basic earnings per common share 2 0.37 0.42 0.61 0.46 1.85 Diluted earnings per common share 3 0.37 0.42 0.60 0.45 1.85 Dividends per common share 0.31 0.31 0.31 0.31 1.24 2017 4 Revenues $ 591,562 $ 632,281 $ 673,185 $ 658,597 $ 2,555,625 Operating income 1 69,738 77,802 111,473 87,220 346,233 Net income 34,666 39,134 60,544 32,843 167,187 Net income for common stock 34,193 38,661 60,073 32,370 165,297 Basic earnings per common share 2 0.31 0.36 0.55 0.30 1.52 Diluted earnings per common share 3 0.31 0.36 0.55 0.30 1.52 Dividends per common share 0.31 0.31 0.31 0.31 1.24 Hawaiian Electric consolidated 2018 Revenues $ 570,427 $ 608,126 $ 687,409 $ 680,563 $ 2,546,525 Operating income 1 51,369 55,144 74,036 61,112 241,661 Net income 27,974 31,668 50,210 35,796 145,648 Net income for common stock 27,475 31,169 49,712 35,297 143,653 2017 5 Revenues $ 518,611 $ 556,875 $ 598,769 $ 583,311 2,257,566 Operating income 1 50,361 56,482 88,497 68,184 263,524 Net income 21,964 26,143 47,985 25,854 121,946 Net income for common stock 21,465 25,644 47,487 25,355 119,951 Note: HEI owns all of Hawaiian Electric’s common stock, therefore per share data for Hawaiian Electric is not meaningful. 1 The Company and Hawaiian Electric adopted ASU No. 2017-07 in the first quarter of 2018: (1) retrospectively for the presentation in the income statement of the service cost component and the other components of NPPC and NPBC, and (2) prospectively for the capitalization in assets of the service cost component of NPPC and NPBC for Hawaiian Electric and its subsidiaries. See Note 1. 2 The quarterly basic earnings per common share are based upon the weighted-average number of shares of common stock outstanding in each quarter. 3 The quarterly diluted earnings per common share are based upon the weighted-average number of shares of common stock outstanding in each quarter plus the dilutive incremental shares at quarter end. 4 In the fourth quarter of 2017, the Company recorded a $14.2 million adjustment, primarily to reduce deferred tax net asset balances (not accounted for under Utility regulatory ratemaking) to reflect the lower rates enacted by the Tax Act. Also included in this adjustment is $0.7 million (net of tax) of non-executive bonuses paid by ASB related to the enactment of federal tax reform. See below for the impact of the Utilities lower RAM revenues due to the expiration of the 2013 settlement agreement. 5 In the fourth quarter of 2017, Hawaiian Electric consolidated recorded a $9.2 million adjustment to reduce deferred tax net asset balances (not accounted for under regulatory ratemaking) to reflect the lower rates enacted by the Tax Act. In the first five months of 2017, the Utilities recorded lower RAM revenues due to the expiration of the 2013 settlement agreement that allowed the accrual of RAM revenues on January 1 (vs. June 1) for years 2014 to 2016 at Hawaiian Electric. For the first and second quarters of 2017, the Utilities recorded lower revenues of $12 million ( $7 million , net of tax impacts) and $8 million ( $4 million , net of tax impacts) due to this RAM lag, respectively.

Summary of significant accoun_4

Summary of significant accounting policies - Depreciation (Details) $ in Millions	Feb. 02, 2018MWhMW	Nov. 24, 2017MW	Dec. 31, 2018USD ($)MW	Dec. 31, 2017USD ($)	Dec. 31, 2016
Depreciation
Composite annual depreciation rate			3.20%	3.20%	3.20%
Minimum
Depreciation
Estimated useful life under production plant (in years)			16 years
Estimated useful life under transmission and distribution plant (in years)			10 years
Estimated useful life under general plant (in years)			5 years
Maximum
Depreciation
Estimated useful life under production plant (in years)			88 years
Estimated useful life under transmission and distribution plant (in years)			79 years
Estimated useful life under general plant (in years)			65 years
Hamakua Energy Partners, L.P. (HEP)
Depreciation
Power produced by power plants (in megawatts)		60	60
Mauo, LLC
Depreciation
Power produced by power plants (in megawatts)	8.6
Power storage capacity (in megawatt hours) | MWh	42.3
American Savings Bank (ASB)
Depreciation
Reserve requirement | $			$ 28.1	$ 17.9

Summary of significant accoun_5

Summary of significant accounting policies - Leases and Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Leases
Operating lease expense	$ 21	$ 20	$ 19
Future minimum lease payments
2,019	11
2,020	9
2,021	8
2,022	5
2,023	4
Thereafter	12
Total	49
ASU 2016-02 | Scenario, Forecast
Future minimum lease payments
Operating lease, liability				$ 257
Operating lease, right-of-use asset				257
ASU 2016-02 | Scenario, Forecast | PPAs
Future minimum lease payments
Operating lease, liability				215
Operating lease, right-of-use asset				215
Hawaiian Electric Company, Inc. and Subsidiaries
Leases
Operating lease expense	11	$ 11	$ 10
Future minimum lease payments
2,019	6
2,020	6
2,021	5
2,022	2
2,023	2
Thereafter	3
Total	$ 24
Hawaiian Electric Company, Inc. and Subsidiaries | ASU 2016-02 | Scenario, Forecast
Future minimum lease payments
Operating lease, liability				236
Operating lease, right-of-use asset				$ 236

Summary of significant accoun_6

Summary of significant accounting policies - Changes In Accounting Standard Updates (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses									$ 2,527,493	$ 2,209,392	$ 2,024,816
Operating income	$ 84,604	$ 98,064	$ 78,799	$ 71,889	$ 87,220	$ 111,473	$ 77,802	$ 69,738	333,356	346,233	355,838
Retirement defined benefits expense—other than service costs									(5,962)	(7,942)	(7,663)
Electric utility
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses									2,304,864	1,994,042	1,804,298
Operating income									241,661	263,524	290,070
Bank
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses									206,040	198,104	197,697
Operating income									108,235	99,536	88,227
Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses									16,589	17,246	22,821
Operating income									(16,540)	(16,827)	(22,459)
As previously filed
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										2,217,334	2,032,479
Operating income										338,291	348,175
Retirement defined benefits expense—other than service costs										0	0
As previously filed | Electric utility
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										2,000,045	1,809,900
Operating income										257,521	284,468
As previously filed | Bank
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										198,924	198,572
Operating income										98,716	87,352
As previously filed | Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										18,365	24,007
Operating income										(17,946)	(23,645)
ASU 2017-07 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										(7,942)	(7,663)
Operating income										7,942	7,663
Retirement defined benefits expense—other than service costs										(7,942)	(7,663)
ASU 2017-07 | Adjustment | Electric utility
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										(6,003)	(5,602)
Operating income										6,003	5,602
ASU 2017-07 | Adjustment | Bank
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										(820)	(875)
Operating income										820	875
ASU 2017-07 | Adjustment | Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										(1,119)	(1,186)
Operating income										1,119	1,186
Hawaiian Electric Company, Inc. and Subsidiaries
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses									2,304,864	1,994,042	1,804,298
Operating income	$ 61,112	$ 74,036	$ 55,144	$ 51,369	$ 68,184	$ 88,497	$ 56,482	$ 50,361	241,661	263,524	290,070
Retirement defined benefits expense—other than service costs									(3,631)	(6,003)	(5,602)
Other operation and maintenance									461,491	411,907	399,931
Hawaiian Electric Company, Inc. and Subsidiaries | As previously filed
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										2,000,045	1,809,900
Operating income										257,521	284,468
Retirement defined benefits expense—other than service costs										0	0
Other operation and maintenance										417,910	405,533
Hawaiian Electric Company, Inc. and Subsidiaries | ASU 2017-07 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										(6,003)	(5,602)
Operating income										6,003	5,602
Retirement defined benefits expense—other than service costs										(6,003)	(5,602)
Other operation and maintenance										(6,003)	(5,602)
Hawaiian Electric
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses									1,639,275	1,420,606	1,272,187
Operating income									163,275	177,898	202,197
Retirement defined benefits expense—other than service costs									(2,649)	(5,049)	(5,058)
Other operation and maintenance									313,346	274,391	268,118
Hawaiian Electric | As previously filed
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										1,425,655	1,277,245
Operating income										172,849	197,139
Retirement defined benefits expense—other than service costs										0	0
Other operation and maintenance										279,440	273,176
Hawaiian Electric | ASU 2017-07 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										(5,049)	(5,058)
Operating income										5,049	5,058
Retirement defined benefits expense—other than service costs										(5,049)	(5,058)
Other operation and maintenance										(5,049)	(5,058)
HELCO
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										287,775	267,142
Operating income										45,692	44,243
Retirement defined benefits expense—other than service costs										(93)	319
Other operation and maintenance										66,184	64,216
HELCO | As previously filed
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										287,868	266,823
Operating income										45,599	44,562
Retirement defined benefits expense—other than service costs										0	0
Other operation and maintenance										66,277	63,897
HELCO | ASU 2017-07 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										(93)	319
Operating income										93	(319)
Retirement defined benefits expense—other than service costs										(93)	319
Other operation and maintenance										(93)	319
MECO
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										285,661	264,969
Operating income										40,017	43,736
Retirement defined benefits expense—other than service costs										(861)	(863)
Other operation and maintenance										71,332	67,597
MECO | As previously filed
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										286,522	265,832
Operating income										39,156	42,873
Retirement defined benefits expense—other than service costs										0	0
Other operation and maintenance										72,193	68,460
MECO | ASU 2017-07 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses										(861)	(863)
Operating income										861	863
Retirement defined benefits expense—other than service costs										(861)	(863)
Other operation and maintenance										(861)	(863)
American Savings Bank (ASB)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses									206,040	198,104	197,697
Operating income									108,235	99,536	88,227
Retirement defined benefits expense—other than service costs									(1,657)	(820)	(875)
Compensation and employee benefits									98,387	94,931	89,242
Other expense									$ 17,238	20,144	19,362
American Savings Bank (ASB) | As previously filed
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Compensation and employee benefits										95,751	90,117
Other expense										19,324	18,487
American Savings Bank (ASB) | ASU 2017-07 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Compensation and employee benefits										(820)	(875)
Other expense										$ 820	$ 875

Summary of significant accoun_7

Summary of significant accounting policies - Accounts Receivable and Additional Information (Details) - USD ($) $ in Thousands	Aug. 11, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable
Allowance for customer accounts receivable, accrued unbilled revenues and other accounts receivable		$ 1,500	$ 1,200
Electric utility revenues
Weighted average AFUDC rate	1.75%
Goodwill and other intangibles
Goodwill		82,190	82,190
American Savings Bank (ASB)
Goodwill and other intangibles
Goodwill		82,190	82,190
Low-income housing investments		67,626	59,016
Commitments to fund affordable housing investments		$ 18,100	$ 15,800
American Savings Bank (ASB) | Measurement Band A
Goodwill and other intangibles
Risks inherent in servicing assets and servicing liabilities band percent for risk categorization		0.50%
American Savings Bank (ASB) | Measurement Band B
Goodwill and other intangibles
Risks inherent in servicing assets and servicing liabilities band percent for risk categorization		1.00%
American Savings Bank (ASB) | Loans receivable
Nonperforming loans
Period for classification as delinquent		90 days
American Savings Bank (ASB) | Mortgage receivable
Nonperforming loans
Period for classification as delinquent		180 days
American Savings Bank (ASB) | Consumer
Nonperforming loans
Period for write-off		120 days
Hawaiian Electric Company, Inc. and Subsidiaries
Electric utility revenues
Weighted average AFUDC rate		7.30%	7.70%	7.60%
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum
Contributions in aid of construction
Contributions amortized period		30 years
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum
Contributions in aid of construction
Contributions amortized period		55 years
American Savings Bank (ASB)
Loans modified in a troubled debt restructuring
Number of consecutive months of repayment required for loans to be removed from nonaccrual status		6 months
Goodwill and other intangibles
Goodwill		$ 82,200	$ 82,200

Summary of significant accoun_8

Summary of significant accounting policies - Summary of Income Tax Expense Related to Investment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Net benefit to income tax expense	$ (50,797)	$ (109,393)	$ (123,695)
American Savings Bank (ASB)
Tax Credit Carryforward [Line Items]
Net benefit to income tax expense	(24,069)	(31,719)	(30,073)
American Savings Bank (ASB) | Variable Interest Entity, Not Primary Beneficiary
Tax Credit Carryforward [Line Items]
Amortization recognized in the provision for income taxes	(7,700)	(7,400)	(5,800)
Tax credits and other tax benefits recognized in the provision for income taxes	10,900	10,700	8,400
Net benefit to income tax expense	$ 3,200	$ 3,300	$ 2,600

Segment financial information_2

Segment financial information (Details) $ in Thousands	Feb. 02, 2018MWhprojectMW	Nov. 24, 2017MW	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)MW	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment financial information
Revenues											$ 2,614,831		$ 2,380,654
Revenues			$ 761,650	$ 768,048	$ 685,277	$ 645,874	$ 658,597	$ 673,185	$ 632,281	$ 591,562	2,860,849	$ 2,555,625	2,380,654
Depreciation and amortization											255,629	221,998	204,746
Interest expense, net											104,216	91,128	88,558
Income (loss) before income taxes											254,461	276,580	373,841
Income taxes (benefit)											50,797	109,393	123,695
Net income (loss)			50,046	66,371	46,527	40,720	32,843	60,544	39,134	34,666	203,664	167,187	250,146
Preferred stock dividends of subsidiaries											1,890	1,890	1,890
Net income for common stock			49,573	$ 65,900	$ 46,054	$ 40,247	32,370	$ 60,073	$ 38,661	$ 34,193	201,774	165,297	248,256
Capital expenditures											537,369	495,187	330,043
Assets			13,104,051				12,534,160				13,104,051	12,534,160	11,881,981
Electric utility
Segment financial information
Revenues											2,567,531		2,094,368
Revenues											2,546,525	2,257,566	2,094,368
Depreciation and amortization											230,228	201,282	193,996
Interest expense, net											73,348	69,637	66,824
Income (loss) before income taxes											180,426	205,145	229,113
Income taxes (benefit)											34,778	83,199	84,801
Net income (loss)											145,648	121,946	144,312
Preferred stock dividends of subsidiaries											1,995	1,995	1,995
Net income for common stock											143,653	119,951	142,317
Capital expenditures											445,863	441,598	320,437
Assets			5,967,503				5,630,613				5,967,503	5,630,613	5,431,903
Bank
Segment financial information
Revenues											47,300		285,924
Revenues											314,275	297,640	285,924
Depreciation and amortization											21,443	19,416	9,813
Interest expense, net											15,539	12,156	12,755
Income (loss) before income taxes											106,578	98,716	87,352
Income taxes (benefit)											24,069	31,719	30,073
Net income (loss)											82,509	66,997	57,279
Preferred stock dividends of subsidiaries											0	0	0
Net income for common stock											82,509	66,997	57,279
Capital expenditures											72,666	53,272	9,394
Assets			7,027,894				6,798,659				7,027,894	6,798,659	6,421,357
Other
Segment financial information
Revenues											0		362
Revenues											49	419	362
Depreciation and amortization											3,958	1,300	937
Interest expense, net											15,329	9,335	8,979
Income (loss) before income taxes											(32,543)	(27,281)	57,376
Income taxes (benefit)											(8,050)	(5,525)	8,821
Net income (loss)											(24,493)	(21,756)	48,555
Preferred stock dividends of subsidiaries											(105)	(105)	(105)
Net income for common stock											(24,388)	(21,651)	48,660
Capital expenditures											18,840	317	212
Assets			$ 108,654				$ 104,888				108,654	104,888	28,721
Operating Segments
Segment financial information
Revenues											2,860,849	2,555,625	2,380,654
Operating Segments | Electric utility
Segment financial information
Revenues											2,546,472	2,257,455	2,094,224
Operating Segments | Bank
Segment financial information
Revenues											314,275	297,640	285,924
Operating Segments | Other
Segment financial information
Revenues											102	530	506
Intersegment eliminations
Segment financial information
Revenues											0	0	0
Intersegment eliminations | Electric utility
Segment financial information
Revenues											53	111	144
Intersegment eliminations | Bank
Segment financial information
Revenues											0	0	0
Intersegment eliminations | Other
Segment financial information
Revenues											$ (53)	$ (111)	$ (144)
Hamakua Energy Partners, L.P. (HEP)
Segment financial information
Power produced by power plants (in megawatts) | MW		60									60
Mauo, LLC
Segment financial information
Power produced by power plants (in megawatts) | MW	8.6
Power storage capacity (in megawatt hours) | MWh	42.3
Power purchase agreement term	15 years
Power purchase agreement extension term	5 years
Number of project sites expected to be placed in service during 2019 and 2020 | project	5

Electric utility segment - Regu

Electric utility segment - Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Regulatory assets
Regulatory assets	$ 833,426	$ 869,297
Regulatory liabilities
Regulatory liabilities	$ 950,236	880,770
Minimum | Income taxes
Regulatory liabilities
Authorized amortization or recovery periods	1 year
Maximum | Income taxes
Regulatory liabilities
Authorized amortization or recovery periods	55 years
Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory assets
Regulatory assets	$ 833,426	869,297
Regulatory liabilities
Regulatory liabilities	950,236	880,770
Hawaiian Electric Company, Inc. and Subsidiaries | Cost of removal in excess of salvage value
Regulatory liabilities
Regulatory liabilities	491,006	453,986
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes
Regulatory liabilities
Regulatory liabilities	413,339	406,324
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans, regulatory liabilities
Regulatory liabilities
Regulatory liabilities	$ 9,546	9,961
Authorized amortization or recovery periods	5 years
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory liabilities
Regulatory liabilities
Regulatory liabilities	$ 36,345	10,499
Authorized amortization or recovery periods	5 years
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Cost of removal in excess of salvage value
Regulatory liabilities
Authorized amortization or recovery periods	1 year
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Other, regulatory liabilities
Regulatory liabilities
Remaining amortization or recovery periods	1 year
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Cost of removal in excess of salvage value
Regulatory liabilities
Authorized amortization or recovery periods	60 years
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Other, regulatory liabilities
Regulatory liabilities
Remaining amortization or recovery periods	2 years
Hawaiian Electric Company, Inc. and Subsidiaries | Current assets
Regulatory assets
Regulatory assets	$ 71,016	88,390
Hawaiian Electric Company, Inc. and Subsidiaries | Long-term assets
Regulatory assets
Regulatory assets	762,410	780,907
Hawaiian Electric Company, Inc. and Subsidiaries | Current liabilities
Regulatory liabilities
Regulatory liabilities	17,977	3,401
Hawaiian Electric Company, Inc. and Subsidiaries | Long-term liabilities
Regulatory liabilities
Regulatory liabilities	932,259	877,369
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans, regulatory assets
Regulatory assets
Regulatory assets	624,126	637,204
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes
Regulatory assets
Regulatory assets	$ 114,076	118,201
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes | Minimum
Regulatory assets
Authorized amortization or recovery periods	1 year
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes | Maximum
Regulatory assets
Authorized amortization or recovery periods	55 years
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account
Regulatory assets
Regulatory assets	$ 49,560	64,087
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account | Minimum
Regulatory assets
Authorized amortization or recovery periods	1 year
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account | Maximum
Regulatory assets
Authorized amortization or recovery periods	2 years
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances
Regulatory assets
Regulatory assets	$ 10,065	11,993
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances | Minimum
Regulatory assets
Authorized amortization or recovery periods	19 years
Remaining amortization or recovery periods	6 years
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances | Maximum
Regulatory assets
Authorized amortization or recovery periods	30 years
Remaining amortization or recovery periods	18 years
Hawaiian Electric Company, Inc. and Subsidiaries | Vacation earned, but not yet taken
Regulatory assets
Regulatory assets	$ 10,820	11,224
Authorized amortization or recovery periods	1 year
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory assets
Regulatory assets
Regulatory assets	$ 24,779	$ 26,588
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory assets | Minimum
Regulatory assets
Authorized amortization or recovery periods	1 year
Remaining amortization or recovery periods	1 year
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory assets | Maximum
Regulatory assets
Authorized amortization or recovery periods	50 years
Remaining amortization or recovery periods	46 years

Electric utility segment - Majo

Electric utility segment - Major Customers (Details) - Operating revenues - Customer concentration - Various federal government agencies - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Major customers
Operating revenues percentage	11.00%	11.00%	11.00%
Operating revenues amount	$ 273	$ 239	$ 226

Electric utility segment - Cumu

Electric utility segment - Cumulative Preferred Stock (Details)	Dec. 31, 2018$ / shares
Series G Preferred Stock | Hawaii Electric Light Company, Inc. (HELCO)
Class of Stock [Line Items]
Voluntary liquidation price	$ 100
Redemption price	100
Series H Preferred Stock | Maui Electric Company, Limited (MECO)
Class of Stock [Line Items]
Voluntary liquidation price	100
Redemption price	100
Hawaiian Electric Company, Inc (HECO) | Series C, D, E, H, J and K Preferred Stock
Class of Stock [Line Items]
Voluntary liquidation price	20
Redemption price	21
Hawaiian Electric Company, Inc (HECO) | Series I Preferred Stock
Class of Stock [Line Items]
Voluntary liquidation price	20
Redemption price	$ 20

Electric utility segment - Rela

Electric utility segment - Related-Party Transactions (Details) - Hawaiian Electric Industries, Inc. - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Hamakua Energy Partners, L.P. (HEP)
Related Party Transaction [Line Items]
Amount charged to subsidiaries for general management and administrative services	$ 3	$ 56
Hawaiian Electric Company, Inc (HECO)
Related Party Transaction [Line Items]
Amount charged to subsidiaries for general management and administrative services		$ 5.9	$ 6.2	$ 6.5
Effective interest rate basis term		30 days
Line of credit facility basis point spread		0.15%

Electric utility segment - Unco

Electric utility segment - Unconsolidated Variable Interest Entities (Details)	1 Months Ended	12 Months Ended
	Mar. 31, 2004USD ($)security	Dec. 31, 2018USD ($)agreemententity
Variable Interest Entity [Line Items]
Investment in 2004 Debentures		$ 51,500,000
Interest income		$ 3,400,000
Number of power purchase agreements (PPAs) | agreement		4
Hawaii Electric Light Company, Inc. (HELCO)
Variable Interest Entity [Line Items]
Principal amount of 2004 Debentures	$ 10,000,000
Hawaiian Electric Company, Inc (HECO)
Variable Interest Entity [Line Items]
Principal amount of 2004 Debentures	$ 31,500,000
Number of power purchase agreements (PPAs) | agreement		4
Number of entities owning wind farms not required to be consolidated as VIE's | entity		2
Minimum potential number of IPP entities consolidated into company in the future | entity		1
2004 Trust Preferred Securities | Hawaiian Electric
Variable Interest Entity [Line Items]
Balance of Trust Securities		$ 50,000,000
Dividend distributions on Trust Preferred Securities		3,300,000
2004 Trust Preferred Securities | Hawaiian Electric Company, Inc (HECO)
Variable Interest Entity [Line Items]
Number of 2004 Trust Preferred Securities issued | security	2,000,000
Dividend rate on 2004 Trust Preferred Securities	6.50%
Aggregate Liquidation preference	$ 50,000,000
Trust Common Securities | Hawaiian Electric
Variable Interest Entity [Line Items]
Balance of Trust Securities		1,500,000
Common dividend		$ 100,000
Trust Common Securities | Hawaiian Electric Company, Inc (HECO)
Variable Interest Entity [Line Items]
Aggregate Liquidation preference	$ 1,500,000

Electric utility segment - Addi

Electric utility segment - Additional Information (Details)	Dec. 14, 2018USD ($)	Sep. 26, 2018USD ($)	Aug. 09, 2018USD ($)	Jun. 22, 2018USD ($)	May 01, 2018USD ($)	Feb. 16, 2018USD ($)	Apr. 27, 2017USD ($)	Aug. 11, 2016USD ($)	Feb. 28, 2019USD ($)	Jun. 30, 2018USD ($)MW	May 31, 2018MW	Aug. 31, 2017USD ($)	Jun. 30, 2017USD ($)$ / kWhMW	Jun. 30, 2015MW	Aug. 31, 2012MW	May 31, 2012MW	Mar. 31, 1988MW	Dec. 31, 2018USD ($)	Dec. 31, 2018USD ($)agreement$ / kWhMW	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Fuel contracts
Revenue subject to refund																			$ 10,000,000
Power purchase agreements
Number of power purchase agreements (PPAs) | agreement																			4
Renewable projects
ERP/EAM cost recovery cap								$ 77,600,000
ERP/EAM required pass-through savings								$ 244,000,000
ERP/EAM project service period (in years)								12 years
Weighted average AFUDC rate								1.75%
ERP/EAM implementation project costs																						$ 77,500,000
ERP/EAM implementation project costs, operations and management																						16,700,000
ERP/EAM implementation project costs, capital costs																						2,600,000
ERP/EAM implementation project costs, deferred costs																						58,200,000
ERP/EAM implementation project costs, accrued carrying costs once put into service																		$ 200,000	$ 200,000			200,000	$ 200,000
Project facility capacity (in mW) | MW										50
Project, lease term (in years)										35 years
Maximum project budget										$ 157,300,000
Percent of costs recoverable through recovery mechanisms other than base rates										90.00%
Total project costs incurred																		144,900,000
Amount recoverable through the major project interim recovery										$ 141,600,000								141,600,000	141,600,000			141,600,000	141,600,000
Environmental regulation
Solar project, energy production (in megawatts) | MW													20
Solar project, project cap													$ 67,000,000
Solar project, maximum energy costs (in dollars per KWH) | $ / kWh													9.56
Solar project, cost incurred																							38,600,000
Accounts receivable and unbilled revenues, net																		325,672,000	325,672,000	$ 263,209,000		325,672,000	325,672,000
Environmental remediation, estimated cost		$ 3,400,000
Decoupling
Threshold of capital expenditures in excess of customer contributions for qualification for major project interim recovery							$ 2,500,000
Major project interim recovery requested amount							$ 3,400,000
Major product interim recovered amount																			$ 500,000
Target performance historical measurement period																			10 years
Service reliability, maximum penalty, percent of return on equity																			20.00%
Maximum penalty, pending adjusted amount																			$ 6,700,000
Dead band percentage above or below target																			3.00%
Call center performance, maximum penalty, percent																			8.00%
Call center performance, maximum penalty, pending adjusted amount																			$ 1,300,000
Call center performance, maximum penalty amount																			$ 2,100,000
Performance incentive mechanism, demand response, award percentage of annual maintenance costs																			5.00%
Performance incentive mechanism, demand response, maximum award																			$ 500,000
Performance incentive mechanism, demand response, penalty																			$ 0
Performance incentive mechanism, savings calculation, energy price, renewable projects with storage capacity | $ / kWh																			0.115
Performance incentive mechanism, savings calculation, energy price, renewable energy-only projects | $ / kWh																			0.095
Performance incentive mechanism, expected savings percentage, phase 1																			20.00%
Performance incentive mechanism, savings calculation, incentive cap phase 1																			$ 3,500,000
Performance incentive mechanism, expected savings in Phase 2, January 2019																			15.00%
Performance incentive mechanism, expected savings in Phase 2, February 2019																			10.00%
Performance incentive mechanism, expected savings in Phase 2, March 2019																			5.00%
Performance incentive mechanism, savings calculation, incentive cap																			$ 3,000,000
Performance incentive mechanism, penalty																			0
Statement of probable entitlement, interim increase						$ 36,000,000
Rate increase before tax act impact				$ 37,700,000
Tax act impact on rate				$ 38,300,000
Revenue, calculation assumptions, rate of return, return on average common equity				9.50%
Revenue, calculation assumption, rate of return				7.57%
General rate increase, risk sharing percentage, ratepayer				98.00%
General rate increase, risk sharing percentage, utility				2.00%
General rate increase, maximum exposure cap				$ 2,500,000
PCB Contamination
Environmental regulation
Accrual for environmental loss contingencies																		4,800,000	$ 4,800,000			4,800,000	4,800,000
Subsequent Event
Renewable projects
ERP/EAM required pass-through savings									$ 244,000,000
ERP/EAM project service period (in years)									12 years
ERP/EAM implementation project, expected future O&M expense reductions									$ 141,000,000
ERP/EAM implementation project, future cost avoidance related to capital costs and tax costs									$ 103,000,000
Hawaiian Electric Company, Inc (HECO)
Power purchase agreements
Number of power purchase agreements (PPAs) | agreement																			4
Hawaiian Electric Company, Inc. and Subsidiaries
Fuel contracts
Estimated cost of minimum purchase within 2018 year																			$ 140,000,000
Cost of purchases																			$ 700,000,000	600,000,000	$ 400,000,000
Power purchase agreements
Power purchase capacity excluding agreements with smaller IPPs (in megawatts) | MW																			516.5
Expected fixed capacity charges per year for 2018 through 2022, minimum																			$ 100,000,000
Expected fixed capacity charges from 2023 through 2033																			300,000,000
Environmental regulation
ARO, recognition impact on earnings																			0	0
Changes in the asset retirement obligation liability
Balance at the beginning of the period																			6,035,000	25,589,000
Accretion expense																			282,000	10,000
Liabilities incurred																			1,058,000	5,370,000
Liabilities settled																			(74,000)	(527,000)
Revisions in estimated cash flows																			1,125,000	(24,407,000)
Balance at the end of the period																		8,426,000	8,426,000	$ 6,035,000	$ 25,589,000	8,426,000	8,426,000
Hawaiian Telcom
Environmental regulation
Accounts receivable and unbilled revenues, net																		48,000,000	48,000,000			48,000,000	48,000,000
PGV Facility
Power purchase agreements
Power purchase capacity excluding agreements with smaller IPPs (in megawatts) | MW											34.6
HELCO
Decoupling
Interim general rate increase												$ 9,900,000
Stipulated return on average common equity rate	10.50%											9.50%
Interim rate increase (decrease), amount					$ (9,900,000)
General rate increase, revenue	$ 13,400,000
General rate increase, revenue, percent	3.40%
General rate increase, return on average common equity percent decrease	8.30%
MECO
Decoupling
Interim general rate increase			$ 12,500,000
Interim general rate increase, effective interest rate of return			7.43%
Stipulated return on average common equity rate			9.50%
Interim general rate increase, common equity capitalization			57.00%
Interim general rate increase, rate base			$ 462,000,000
Maui Electric Company, Limited (MECO)
Environmental regulation
Additional accrued investigation and estimated cleanup costs																		2,700,000	$ 2,700,000			2,700,000	2,700,000
Island Energy Services, LLC (IES)
Fuel contracts
Period prior to year end for written notice for cancellation																			120 days
AES Hawaii, Inc. (AES Hawaii)
Power purchase agreements
Purchase commitment, period																	30 years
Purchase commitment, minimum power volume required to be purchased | MW															186		180
Purchase commitment, arbitration, additional capacity requirement | MW														9
Hu Honua Bioenergy
Power purchase agreements
Purchase commitment, minimum power volume required to be purchased | MW																21.5
Hawaiian Telcom
Environmental regulation
Accounts receivable and unbilled revenues, net																		19,100,000	$ 19,100,000			19,100,000	19,100,000
Hawaiian Telcom | Hawaiian Electric Company, Inc (HECO)
Environmental regulation
Accounts receivable and unbilled revenues, net																		12,300,000	12,300,000			12,300,000	12,300,000
Hawaiian Telcom | HELCO
Environmental regulation
Accounts receivable and unbilled revenues, net																		5,500,000	5,500,000			5,500,000	5,500,000
Hawaiian Telcom | MECO
Environmental regulation
Accounts receivable and unbilled revenues, net																		$ 1,300,000	$ 1,300,000			$ 1,300,000	$ 1,300,000

Electric utility segment - Powe

Electric utility segment - Power Purchase Agreements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	$ 639	$ 587	$ 563
Kalaeloa Partners, L.P. (Kalaeloa)
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	216	180	152
AES Hawaii, Inc. (AES Hawaii)
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	140	140	149
HPOWER
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	69	67	71
Puna Geothermal Venture
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	15	38	28
Hamakua Energy Partners, L.P. (HEP)
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	56	35	29
Hawaiian Commercial & Sugar (HC&S)
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	0	0	1
Wind IPPs
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	107	97	113
Solar IPPs
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	29	27	15
Other IPPs
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	$ 7	$ 3	$ 5

Electric utility segment - Annu

Electric utility segment - Annual Decoupling Filings (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
HELCO
Regulatory Projects and Legal Obligations [Line Items]
2018 Annual incremental RAM adjusted revenues	$ 3.4
Annual change in accrued RBA balance as of December 31, 2017 (and associated revenue taxes)	0.7
2017 Tax Act Adjustment	0
Net annual incremental amount to be collected under the tariffs	4.1
MECO
Regulatory Projects and Legal Obligations [Line Items]
2018 Annual incremental RAM adjusted revenues	2
Annual change in accrued RBA balance as of December 31, 2017 (and associated revenue taxes)	3.2
2017 Tax Act Adjustment	(2.8)
Net annual incremental amount to be collected under the tariffs	2.4
Hawaiian Electric
Regulatory Projects and Legal Obligations [Line Items]
2018 Annual incremental RAM adjusted revenues	13.8
Annual change in accrued RBA balance as of December 31, 2017 (and associated revenue taxes)	6.6
2017 Tax Act Adjustment	0
Net annual incremental amount to be collected under the tariffs	$ 20.4

Electric utility segment - Cons

Electric utility segment - Consolidating Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues									$ 2,614,831		$ 2,380,654
Expenses
Purchased power									639,000	$ 587,000	563,000
Total expenses									2,527,493	2,209,392	2,024,816
Operating income	$ 84,604	$ 98,064	$ 78,799	$ 71,889	$ 87,220	$ 111,473	$ 77,802	$ 69,738	333,356	346,233	355,838
Allowance for equity funds used during construction									10,877	12,483	8,325
Retirement defined benefits expense—other than service costs									(5,962)	(7,942)	(7,663)
Allowance for borrowed funds used during construction									4,867	4,778	3,144
Income before income taxes									254,461	276,580	373,841
Income taxes									50,797	109,393	123,695
Net income (loss)	50,046	66,371	46,527	40,720	32,843	60,544	39,134	34,666	203,664	167,187	250,146
Preferred stock dividends of subsidiaries									1,890	1,890	1,890
Net income for common stock	49,573	65,900	46,054	40,247	32,370	60,073	38,661	34,193	201,774	165,297	248,256
Hawaiian Electric
Revenues									1,802,550	1,598,504	1,474,384
Expenses
Fuel oil									523,706	408,204	305,359
Purchased power									494,450	454,189	431,009
Other operation and maintenance									313,346	274,391	268,118
Depreciation									137,410	130,889	126,086
Taxes, other than income taxes									170,363	152,933	141,615
Total expenses									1,639,275	1,420,606	1,272,187
Operating income									163,275	177,898	202,197
Allowance for equity funds used during construction									9,208	10,896	6,659
Equity in earnings of subsidiaries									45,393	38,057	42,391
Retirement defined benefits expense—other than service costs									(2,649)	(5,049)	(5,058)
Interest expense and other charges, net									(52,180)	(48,277)	(45,839)
Allowance for borrowed funds used during construction									4,019	4,089	2,484
Income before income taxes									167,066	177,614	202,834
Income taxes									22,333	56,583	59,437
Net income (loss)									144,733	121,031	143,397
Preferred stock dividends of subsidiaries									0	0	0
Net income attributable to Hawaiian Electric									144,733	121,031	143,397
Preferred stock dividends of Hawaiian Electric									1,080	1,080	1,080
Net income for common stock									143,653	119,951	142,317
Hawaii Electric Light Company, Inc. (HELCO)
Revenues									375,493	333,467	311,385
Expenses
Fuel oil									90,792	63,894	55,094
Purchased power									95,838	87,772	81,018
Other operation and maintenance									70,396	66,184	64,216
Depreciation									40,235	38,741	37,797
Taxes, other than income taxes									34,850	31,184	29,017
Total expenses									332,111	287,775	267,142
Operating income									43,382	45,692	44,243
Allowance for equity funds used during construction									478	554	765
Equity in earnings of subsidiaries									0	0	0
Retirement defined benefits expense—other than service costs									(417)	(93)	319
Interest expense and other charges, net									(11,836)	(11,799)	(11,555)
Allowance for borrowed funds used during construction									276	238	294
Income before income taxes									31,883	34,592	34,066
Income taxes									6,868	13,912	12,277
Net income (loss)									25,015	20,680	21,789
Preferred stock dividends of subsidiaries									534	534	534
Net income attributable to Hawaiian Electric									24,481	20,146	21,255
Preferred stock dividends of Hawaiian Electric									0	0	0
Net income for common stock									24,481	20,146	21,255
Maui Electric Company, Limited (MECO)
Revenues									368,700	325,678	308,705
Expenses
Fuel oil									146,030	115,670	94,251
Purchased power									49,019	44,673	50,713
Other operation and maintenance									77,749	71,332	67,597
Depreciation									25,981	23,154	23,178
Taxes, other than income taxes									34,699	30,832	29,230
Total expenses									333,478	285,661	264,969
Operating income									35,222	40,017	43,736
Allowance for equity funds used during construction									1,191	1,033	901
Equity in earnings of subsidiaries									0	0	0
Retirement defined benefits expense—other than service costs									(565)	(861)	(863)
Interest expense and other charges, net									(9,550)	(9,644)	(9,536)
Allowance for borrowed funds used during construction									572	451	366
Income before income taxes									26,870	30,996	34,604
Income taxes									5,577	12,704	13,087
Net income (loss)									21,293	18,292	21,517
Preferred stock dividends of subsidiaries									381	381	381
Net income attributable to Hawaiian Electric									20,912	17,911	21,136
Preferred stock dividends of Hawaiian Electric									0	0	0
Net income for common stock									20,912	17,911	21,136
Other subsidiaries
Revenues									0	0	0
Expenses
Fuel oil									0	0	0
Purchased power									0	0	0
Other operation and maintenance									0	0	0
Depreciation									0	0	0
Taxes, other than income taxes									0	0	0
Total expenses									0	0	0
Operating income									0	0	0
Allowance for equity funds used during construction									0	0	0
Equity in earnings of subsidiaries									0	0	0
Retirement defined benefits expense—other than service costs									0	0	0
Interest expense and other charges, net									0		0
Allowance for borrowed funds used during construction									0	0	0
Income before income taxes									0	0	0
Income taxes									0	0	0
Net income (loss)									0	0	0
Preferred stock dividends of subsidiaries									0	0	0
Net income attributable to Hawaiian Electric									0	0	0
Preferred stock dividends of Hawaiian Electric									0	0	0
Net income for common stock									0	0	0
Consolidating adjustments
Revenues									(218)	(83)	(106)
Expenses
Fuel oil									0	0	0
Purchased power									0	0	0
Other operation and maintenance									0	0	0
Depreciation									0	0	0
Taxes, other than income taxes									0	0	0
Total expenses									0	0	0
Operating income									(218)	(83)	(106)
Allowance for equity funds used during construction									0	0	0
Equity in earnings of subsidiaries									(45,393)	(38,057)	(42,391)
Retirement defined benefits expense—other than service costs									0	0	0
Interest expense and other charges, net									218	83	106
Allowance for borrowed funds used during construction									0	0	0
Income before income taxes									(45,393)	(38,057)	(42,391)
Income taxes									0	0	0
Net income (loss)									(45,393)	(38,057)	(42,391)
Preferred stock dividends of subsidiaries									0	0	0
Net income attributable to Hawaiian Electric									(45,393)	(38,057)	(42,391)
Preferred stock dividends of Hawaiian Electric									0	0	0
Net income for common stock									(45,393)	(38,057)	(42,391)
HECO Consolidated
Revenues									2,546,525	2,257,566	2,094,368
Expenses
Fuel oil									760,528	587,768	454,704
Purchased power									639,307	586,634	562,740
Other operation and maintenance									461,491	411,907	399,931
Depreciation									203,626	192,784	187,061
Taxes, other than income taxes									239,912	214,949	199,862
Total expenses									2,304,864	1,994,042	1,804,298
Operating income	61,112	74,036	55,144	51,369	68,184	88,497	56,482	50,361	241,661	263,524	290,070
Allowance for equity funds used during construction									10,877	12,483	8,325
Equity in earnings of subsidiaries									0	0	0
Retirement defined benefits expense—other than service costs									(3,631)	(6,003)	(5,602)
Interest expense and other charges, net									(73,348)	(69,637)	(66,824)
Allowance for borrowed funds used during construction									4,867	4,778	3,144
Income before income taxes									180,426	205,145	229,113
Income taxes									34,778	83,199	84,801
Net income (loss)	35,796	50,210	31,668	27,974	25,854	47,985	26,143	21,964	145,648	121,946	144,312
Preferred stock dividends of subsidiaries									915	915	915
Net income attributable to Hawaiian Electric									144,733	121,031	143,397
Preferred stock dividends of Hawaiian Electric									1,080	1,080	1,080
Net income for common stock	$ 35,297	$ 49,712	$ 31,169	$ 27,475	$ 25,355	$ 47,487	$ 25,644	$ 21,465	$ 143,653	$ 119,951	$ 142,317

Electric utility segment - Co_2

Electric utility segment - Consolidating Statement of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income for common stock	$ 49,573	$ 65,900	$ 46,054	$ 40,247	$ 32,370	$ 60,073	$ 38,661	$ 34,193	$ 201,774	$ 165,297	$ 248,256
Other comprehensive income (loss), net of taxes:
Effective portion of foreign currency hedge net unrealized gains net of taxes									0	0	(281)
Reclassification adjustment to net income, net of (taxes) benefit									0	454	(119)
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively									(28,101)	65,531	(43,510)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively									21,015	15,737	14,518
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively									8,325	(78,724)	28,584
Other comprehensive income (loss), net of taxes									(8,669)	(1,372)	(6,867)
Comprehensive income attributable to Hawaiian Electric Company, Inc.									193,105	163,925	241,389
Hawaiian Electric
Net income for common stock									143,653	119,951	142,317
Other comprehensive income (loss), net of taxes:
Effective portion of foreign currency hedge net unrealized gains net of taxes											(281)
Reclassification adjustment to net income, net of (taxes) benefit										454	(173)
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively									(26,019)	63,105	(42,631)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively									19,012	14,477	13,254
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively									8,325	(78,724)	28,584
Other comprehensive income (loss), net of taxes									1,318	(688)	(1,247)
Comprehensive income attributable to Hawaiian Electric Company, Inc.									144,971	119,263	141,070
Hawaii Electric Light Company, Inc. (HELCO)
Net income for common stock									24,481	20,146	21,255
Other comprehensive income (loss), net of taxes:
Effective portion of foreign currency hedge net unrealized gains net of taxes											0
Reclassification adjustment to net income, net of (taxes) benefit										0	0
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively									(6,090)	3,093	(5,141)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively									2,819	1,903	1,718
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively									3,305	(4,994)	3,269
Other comprehensive income (loss), net of taxes									34	2	(154)
Comprehensive income attributable to Hawaiian Electric Company, Inc.									24,515	20,148	21,101
Maui Electric Company, Limited (MECO)
Net income for common stock									20,912	17,911	21,136
Other comprehensive income (loss), net of taxes:
Effective portion of foreign currency hedge net unrealized gains net of taxes											0
Reclassification adjustment to net income, net of (taxes) benefit										0	0
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively									(5,004)	7,329	(5,447)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively									2,423	1,619	1,549
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively									2,788	(9,003)	3,852
Other comprehensive income (loss), net of taxes									207	(55)	(46)
Comprehensive income attributable to Hawaiian Electric Company, Inc.									21,119	17,856	21,090
Other subsidiaries
Net income for common stock									0	0	0
Other comprehensive income (loss), net of taxes:
Effective portion of foreign currency hedge net unrealized gains net of taxes											0
Reclassification adjustment to net income, net of (taxes) benefit										0	0
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively									0	0	0
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively									0	0	0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively									0	0	0
Other comprehensive income (loss), net of taxes									0	0	0
Comprehensive income attributable to Hawaiian Electric Company, Inc.									0	0	0
Consolidating adjustments
Net income for common stock									(45,393)	(38,057)	(42,391)
Other comprehensive income (loss), net of taxes:
Effective portion of foreign currency hedge net unrealized gains net of taxes											0
Reclassification adjustment to net income, net of (taxes) benefit										0	0
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively									11,094	(10,422)	10,588
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively									(5,242)	(3,522)	(3,267)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively									(6,093)	13,997	(7,121)
Other comprehensive income (loss), net of taxes									(241)	53	200
Comprehensive income attributable to Hawaiian Electric Company, Inc.									(45,634)	(38,004)	(42,191)
HECO Consolidated
Net income for common stock	$ 35,297	$ 49,712	$ 31,169	$ 27,475	$ 25,355	$ 47,487	$ 25,644	$ 21,465	143,653	119,951	142,317
Other comprehensive income (loss), net of taxes:
Effective portion of foreign currency hedge net unrealized gains net of taxes									0	0	(281)
Reclassification adjustment to net income, net of (taxes) benefit									0	454	(173)
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively									(26,019)	63,105	(42,631)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively									19,012	14,477	13,254
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively									8,325	(78,724)	28,584
Other comprehensive income (loss), net of taxes									1,318	(688)	(1,247)
Comprehensive income attributable to Hawaiian Electric Company, Inc.									$ 144,971	$ 119,263	$ 141,070

Electric utility segment - Co_3

Electric utility segment - Consolidating Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Utility property, plant and equipment
Total property, plant and equipment, net	$ 4,830,118	$ 4,460,248
Other long-term assets
Total assets	13,104,051	12,534,160	$ 11,881,981
Capitalization
Common stock equity	2,162,280	2,097,386	2,066,753	$ 1,927,640
Cumulative preferred stock – not subject to mandatory redemption	0	0
Current liabilities
Interest and dividends payable	28,254	25,837
Deferred credits and other liabilities
Deferred income taxes	372,518	388,430
Total capitalization and liabilities	13,104,051	12,534,160
Hawaiian Electric
Utility property, plant and equipment
Land	40,449	40,392
Plant and equipment	4,456,090	4,144,472
Less accumulated depreciation	(1,523,861)	(1,451,612)
Construction in progress	193,677	231,571
Utility property, plant and equipment, net	3,166,355	2,964,823
Nonutility property, plant and equipment, less accumulated depreciation	5,314	5,933
Total property, plant and equipment, net	3,171,669	2,970,756
Investment in wholly-owned subsidiaries, at equity	576,838	557,013
Current assets
Cash and cash equivalents	16,732	2,059	61,388	16,281
Advances to affiliates		0
Customer accounts receivable, net	125,960	86,987
Accrued unbilled revenues, net	88,060	77,176
Other accounts receivable, net	21,962	11,376
Fuel oil stock, at average cost	54,262	64,972
Materials and supplies, at average cost	30,291	28,325
Prepayments and other	23,214	17,928
Regulatory assets	60,093	76,203
Total current assets	420,574	365,026
Other long-term assets
Regulatory assets	537,708	557,464
Other	69,749	60,157
Total other long-term assets	607,457	617,621
Total assets	4,776,538	4,510,416
Capitalization
Common stock equity	1,957,641	1,845,283	1,799,787	1,728,325
Cumulative preferred stock – not subject to mandatory redemption	22,293	22,293
Long-term debt, net	1,000,137	924,979
Total capitalization	2,980,071	2,792,555
Current liabilities
Current portion of long-term debt		29,978
Short-term borrowings from non-affiliate	25,000	4,999
Short-term borrowings-affiliate		12,000
Accounts payable	126,384	121,328
Interest and dividends payable	16,203	15,677
Taxes accrued, including revenue taxes	164,747	133,839
Regulatory liabilities	7,699	607
Other	46,391	43,121
Total current liabilities	386,424	361,549
Deferred credits and other liabilities
Deferred income taxes	271,438	281,223
Regulatory liabilities	657,210	613,329
Unamortized tax credits	60,271	59,039
Defined benefit pension and other postretirement benefit plans liability	359,174	340,983
Other	61,950	61,738
Total deferred credits and other liabilities	1,410,043	1,356,312
Total capitalization and liabilities	4,776,538	4,510,416
Hawaii Electric Light Company, Inc. (HELCO)
Utility property, plant and equipment
Land	5,606	5,922
Plant and equipment	1,259,553	1,207,043
Less accumulated depreciation	(547,848)	(528,024)
Construction in progress	8,781	8,182
Utility property, plant and equipment, net	726,092	693,123
Nonutility property, plant and equipment, less accumulated depreciation	115	115
Total property, plant and equipment, net	726,207	693,238
Investment in wholly-owned subsidiaries, at equity	0	0
Current assets
Cash and cash equivalents	15,623	4,025	10,749	2,682
Advances to affiliates		0
Customer accounts receivable, net	26,483	22,510
Accrued unbilled revenues, net	17,051	15,940
Other accounts receivable, net	3,131	2,268
Fuel oil stock, at average cost	11,027	8,698
Materials and supplies, at average cost	7,155	8,041
Prepayments and other	5,212	4,514
Regulatory assets	3,177	5,038
Total current assets	88,859	71,034
Other long-term assets
Regulatory assets	120,658	122,783
Other	15,944	16,311
Total other long-term assets	136,602	139,094
Total assets	951,668	903,366
Capitalization
Common stock equity	295,874	286,647	291,291	292,702
Cumulative preferred stock – not subject to mandatory redemption	7,000	7,000
Long-term debt, net	217,749	202,701
Total capitalization	520,623	496,348
Current liabilities
Current portion of long-term debt		10,992
Short-term borrowings from non-affiliate	0	0
Short-term borrowings-affiliate		0
Accounts payable	20,045	17,855
Interest and dividends payable	4,203	4,174
Taxes accrued, including revenue taxes	34,128	34,950
Regulatory liabilities	4,872	1,245
Other	15,077	9,818
Total current liabilities	78,325	79,034
Deferred credits and other liabilities
Deferred income taxes	54,936	56,955
Regulatory liabilities	176,101	169,139
Unamortized tax credits	16,217	16,167
Defined benefit pension and other postretirement benefit plans liability	73,147	66,447
Other	32,319	19,276
Total deferred credits and other liabilities	352,720	327,984
Total capitalization and liabilities	951,668	903,366
Maui Electric Company, Limited (MECO)
Utility property, plant and equipment
Land	3,612	3,016
Plant and equipment	1,094,028	1,053,372
Less accumulated depreciation	(505,633)	(496,716)
Construction in progress	30,687	23,341
Utility property, plant and equipment, net	622,694	583,013
Nonutility property, plant and equipment, less accumulated depreciation	1,532	1,532
Total property, plant and equipment, net	624,226	584,545
Investment in wholly-owned subsidiaries, at equity	0	0
Current assets
Cash and cash equivalents	3,421	6,332	2,048	5,385
Advances to affiliates		12,000
Customer accounts receivable, net	25,453	18,392
Accrued unbilled revenues, net	16,627	13,938
Other accounts receivable, net	3,033	1,210
Fuel oil stock, at average cost	14,646	13,203
Materials and supplies, at average cost	17,758	18,031
Prepayments and other	3,692	2,913
Regulatory assets	7,746	7,149
Total current assets	92,376	93,168
Other long-term assets
Regulatory assets	104,044	100,660
Other	17,299	15,061
Total other long-term assets	121,343	115,721
Total assets	837,945	793,434
Capitalization
Common stock equity	280,863	270,265	259,554	263,725
Cumulative preferred stock – not subject to mandatory redemption	5,000	5,000
Long-term debt, net	200,916	190,836
Total capitalization	486,779	466,101
Current liabilities
Current portion of long-term debt		8,993
Short-term borrowings from non-affiliate	0	0
Short-term borrowings-affiliate		0
Accounts payable	25,362	20,427
Interest and dividends payable	2,841	2,735
Taxes accrued, including revenue taxes	34,458	30,312
Regulatory liabilities	5,406	1,549
Other	20,414	14,197
Total current liabilities	88,481	78,213
Deferred credits and other liabilities
Deferred income taxes	56,823	55,863
Regulatory liabilities	98,948	94,901
Unamortized tax credits	15,034	15,163
Defined benefit pension and other postretirement benefit plans liability	71,338	65,518
Other	20,542	17,675
Total deferred credits and other liabilities	262,685	249,120
Total capitalization and liabilities	837,945	793,434
Other subsidiaries
Utility property, plant and equipment
Land	0	0
Plant and equipment	0	0
Less accumulated depreciation	0	0
Construction in progress	0	0
Utility property, plant and equipment, net	0	0
Nonutility property, plant and equipment, less accumulated depreciation	0	0
Total property, plant and equipment, net	0	0
Investment in wholly-owned subsidiaries, at equity	0	0
Current assets
Cash and cash equivalents	101	101	101	101
Advances to affiliates		0
Customer accounts receivable, net	0	0
Accrued unbilled revenues, net	0	0
Other accounts receivable, net	0	0
Fuel oil stock, at average cost	0	0
Materials and supplies, at average cost	0	0
Prepayments and other	0	0
Regulatory assets	0	0
Total current assets	101	101
Other long-term assets
Regulatory assets	0	0
Other	0	0
Total other long-term assets	0	0
Total assets	101	101
Capitalization
Common stock equity	101	101	101	101
Cumulative preferred stock – not subject to mandatory redemption	0	0
Long-term debt, net	0	0
Total capitalization	101	101
Current liabilities
Current portion of long-term debt		0
Short-term borrowings from non-affiliate	0	0
Short-term borrowings-affiliate		0
Accounts payable	0	0
Interest and dividends payable	0	0
Taxes accrued, including revenue taxes	0	0
Regulatory liabilities	0	0
Other	0	0
Total current liabilities	0	0
Deferred credits and other liabilities
Deferred income taxes	0	0
Regulatory liabilities	0	0
Unamortized tax credits	0	0
Defined benefit pension and other postretirement benefit plans liability	0	0
Other	0	0
Total deferred credits and other liabilities	0	0
Total capitalization and liabilities	101	101
Consolidating adjustments
Utility property, plant and equipment
Land	0	0
Plant and equipment	0	0
Less accumulated depreciation	0	0
Construction in progress	0	0
Utility property, plant and equipment, net	0	0
Nonutility property, plant and equipment, less accumulated depreciation	0	0
Total property, plant and equipment, net	0	0
Investment in wholly-owned subsidiaries, at equity	(576,838)	(557,013)
Current assets
Cash and cash equivalents	0	0	0	0
Advances to affiliates		(12,000)
Customer accounts receivable, net	0	0
Accrued unbilled revenues, net	0	0
Other accounts receivable, net	(21,911)	(7,691)
Fuel oil stock, at average cost	0	0
Materials and supplies, at average cost	0	0
Prepayments and other	0	0
Regulatory assets	0	0
Total current assets	(21,911)	(19,691)
Other long-term assets
Regulatory assets	0	0
Other	0	0
Total other long-term assets	0	0
Total assets	(598,749)	(576,704)
Capitalization
Common stock equity	(576,838)	(557,013)	(550,946)	(556,528)
Cumulative preferred stock – not subject to mandatory redemption	0	0
Long-term debt, net	0	0
Total capitalization	(576,838)	(557,013)
Current liabilities
Current portion of long-term debt		0
Short-term borrowings from non-affiliate	0	0
Short-term borrowings-affiliate		(12,000)
Accounts payable	0	0
Interest and dividends payable	(32)	(11)
Taxes accrued, including revenue taxes	0	0
Regulatory liabilities	0	0
Other	(21,879)	(7,680)
Total current liabilities	(21,911)	(19,691)
Deferred credits and other liabilities
Deferred income taxes	0	0
Regulatory liabilities	0	0
Unamortized tax credits	0	0
Defined benefit pension and other postretirement benefit plans liability	0	0
Other	0	0
Total deferred credits and other liabilities	0	0
Total capitalization and liabilities	(598,749)	(576,704)
HECO Consolidated
Utility property, plant and equipment
Land	49,667	49,330
Plant and equipment	6,809,671	6,404,887
Less accumulated depreciation	(2,577,342)	(2,476,352)
Construction in progress	233,145	263,094
Utility property, plant and equipment, net	4,515,141	4,240,959
Nonutility property, plant and equipment, less accumulated depreciation	6,961	7,580
Total property, plant and equipment, net	4,522,102	4,248,539
Investment in wholly-owned subsidiaries, at equity	0	0
Current assets
Cash and cash equivalents	35,877	12,517	74,286	24,449
Advances to affiliates		0
Customer accounts receivable, net	177,896	127,889
Accrued unbilled revenues, net	121,738	107,054
Other accounts receivable, net	6,215	7,163
Fuel oil stock, at average cost	79,935	86,873
Materials and supplies, at average cost	55,204	54,397
Prepayments and other	32,118	25,355
Regulatory assets	71,016	88,390
Total current assets	579,999	509,638
Other long-term assets
Regulatory assets	762,410	780,907
Other	102,992	91,529
Total other long-term assets	865,402	872,436
Total assets	5,967,503	5,630,613
Capitalization
Common stock equity	1,957,641	1,845,283	$ 1,799,787	$ 1,728,325
Cumulative preferred stock – not subject to mandatory redemption	34,293	34,293
Long-term debt, net	1,418,802	1,318,516
Total capitalization	3,410,736	3,198,092
Current liabilities
Current portion of long-term debt	0	49,963
Short-term borrowings from non-affiliate	25,000	4,999
Short-term borrowings-affiliate		0
Accounts payable	171,791	159,610
Interest and dividends payable	23,215	22,575
Taxes accrued, including revenue taxes	233,333	199,101
Regulatory liabilities	17,977	3,401
Other	60,003	59,456
Total current liabilities	531,319	499,105
Deferred credits and other liabilities
Deferred income taxes	383,197	394,041
Regulatory liabilities	932,259	877,369
Unamortized tax credits	91,522	90,369
Defined benefit pension and other postretirement benefit plans liability	503,659	472,948
Other	114,811	98,689
Total deferred credits and other liabilities	2,025,448	1,933,416
Total capitalization and liabilities	$ 5,967,503	$ 5,630,613

Electric utility segment - Co_4

Electric utility segment - Consolidating Statements of Changes in Common Stock Equity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (decrease) in stockholders' equity
Beginning Balance				$ 2,097,386				$ 2,066,753	$ 2,097,386	$ 2,066,753	$ 1,927,640
Net income for common stock	$ 49,573	$ 65,900	$ 46,054	40,247	$ 32,370	$ 60,073	$ 38,661	34,193	201,774	165,297	248,256
Other comprehensive income (loss), net of tax benefits									(8,669)	(1,372)	(6,867)
Issuance of common stock, net of expenses											26,844
Common stock dividends									(134,987)	(134,873)	(134,050)
Ending Balance	2,162,280				2,097,386				2,162,280	2,097,386	2,066,753
Hawaiian Electric
Increase (decrease) in stockholders' equity
Beginning Balance				1,845,283				1,799,787	1,845,283	1,799,787	1,728,325
Net income for common stock									143,653	119,951	142,317
Other comprehensive income (loss), net of tax benefits									1,318	(688)	(1,247)
Issuance of common stock, net of expenses									70,692	14,000	23,991
Common stock dividends									(103,305)	(87,767)	(93,599)
Ending Balance	1,957,641				1,845,283				1,957,641	1,845,283	1,799,787
Hawaii Electric Light Company, Inc. (HELCO)
Increase (decrease) in stockholders' equity
Beginning Balance				286,647				291,291	286,647	291,291	292,702
Net income for common stock									24,481	20,146	21,255
Other comprehensive income (loss), net of tax benefits									34	2	(154)
Issuance of common stock, net of expenses									1	4	(5)
Common stock dividends									(15,289)	(24,796)	(22,507)
Ending Balance	295,874				286,647				295,874	286,647	291,291
Maui Electric Company, Limited (MECO)
Increase (decrease) in stockholders' equity
Beginning Balance				270,265				259,554	270,265	259,554	263,725
Net income for common stock									20,912	17,911	21,136
Other comprehensive income (loss), net of tax benefits									207	(55)	(46)
Issuance of common stock, net of expenses									1,498	4,801	0
Common stock dividends									(12,019)	(11,946)	(25,261)
Ending Balance	280,863				270,265				280,863	270,265	259,554
Other subsidiaries
Increase (decrease) in stockholders' equity
Beginning Balance				101				101	101	101	101
Net income for common stock									0	0	0
Other comprehensive income (loss), net of tax benefits									0	0	0
Issuance of common stock, net of expenses									0	0	0
Common stock dividends									0	0	0
Ending Balance	101				101				101	101	101
Consolidating adjustments
Increase (decrease) in stockholders' equity
Beginning Balance				(557,013)				(550,946)	(557,013)	(550,946)	(556,528)
Net income for common stock									(45,393)	(38,057)	(42,391)
Other comprehensive income (loss), net of tax benefits									(241)	53	200
Issuance of common stock, net of expenses									(1,499)	(4,805)	5
Common stock dividends									27,308	36,742	47,768
Ending Balance	(576,838)				(557,013)				(576,838)	(557,013)	(550,946)
HECO Consolidated
Increase (decrease) in stockholders' equity
Beginning Balance				1,845,283				1,799,787	1,845,283	1,799,787	1,728,325
Net income for common stock	35,297	$ 49,712	$ 31,169	$ 27,475	25,355	$ 47,487	$ 25,644	$ 21,465	143,653	119,951	142,317
Other comprehensive income (loss), net of tax benefits									1,318	(688)	(1,247)
Issuance of common stock, net of expenses									70,692	14,000	23,991
Common stock dividends									(103,305)	(87,767)	(93,599)
Ending Balance	$ 1,957,641				$ 1,845,283				$ 1,957,641	$ 1,845,283	$ 1,799,787

Electric utility segment - Co_5

Electric utility segment - Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income (loss)	$ 50,046	$ 66,371	$ 46,527	$ 40,720	$ 32,843	$ 60,544	$ 39,134	$ 34,666	$ 203,664	$ 167,187	$ 250,146
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment									214,036	200,658	194,273
Other amortization									41,593	21,340	10,473
Deferred income taxes									(9,368)	37,835	47,118
Allowance for equity funds used during construction									(10,877)	(12,483)	(8,325)
Other									(4,219)	(3,324)	(12,422)
Changes in assets and liabilities
Decrease (increase) in fuel oil stock									7,054	(20,794)	4,786
Decrease (increase) in regulatory assets									9,252	(17,256)	(18,273)
Change in prepaid and accrued income taxes, tax credits and revenue taxes									29,429	20,685	39,109
Increase in defined benefit pension and other postretirement benefit plans liability									20,871	882	1,587
Net cash provided by operating activities									499,312	420,441	495,658
Cash flows from investing activities
Capital expenditures									(537,369)	(495,187)	(330,043)
Contributions in aid of construction									30,599	64,733	30,100
Other, net									13,945	6,468	856
Net cash used in investing activities									(792,059)	(815,299)	(736,465)
Cash flows from financing activities
Common stock dividends									(134,987)	(134,873)	(117,274)
Net proceeds from issuance of common stock									0	0	13,220
Proceeds from issuance of long-term debt									250,000	532,325	115,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds									(53,887)	(465,000)	(75,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less									(18,999)	67,992	(103,063)
Proceeds from other bank borrowings									696,000	59,500	180,835
Other									(1,603)	(6,349)	2,197
Net cash used in financing activities									200,074	378,287	218,781
Net decrease in cash and equivalents									(92,673)	(16,571)	(22,026)
Hawaiian Electric
Cash flows from operating activities
Net income (loss)									144,733	121,031	143,397
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings									(45,493)	(38,157)	(42,491)
Common stock dividends received from subsidiaries									27,408	36,867	47,843
Depreciation of property, plant and equipment									137,410	130,889	126,086
Other amortization									20,956	2,398	2,979
Deferred income taxes									(9,806)	26,342	54,721
Allowance for equity funds used during construction									(9,208)	(10,896)	(6,659)
Other									(1,033)	(1,154)	(2,517)
Changes in assets and liabilities
Decrease (increase) in accounts receivable									(51,656)	1,817	10,175
Increase in accrued unbilled revenues									(10,884)	(11,355)	(5,741)
Decrease (increase) in fuel oil stock									10,710	(17,733)	2,216
Decrease (increase) in materials and supplies									(1,966)	1,603	993
Decrease (increase) in regulatory assets									12,192	(8,395)	(16,161)
Increase (decrease) in accounts payable									14,748	23,519	(10,247)
Change in prepaid and accrued income taxes, tax credits and revenue taxes									24,438	16,716	2,933
Increase in defined benefit pension and other postretirement benefit plans liability									17,178	709	599
Changes in other assets and liabilities									18,484	(16,213)	(11,682)
Net cash provided by operating activities									298,211	257,988	296,444
Cash flows from investing activities
Capital expenditures									(330,531)	(339,279)	(236,425)
Contributions in aid of construction									24,828	57,527	23,611
Advances from (to) affiliates									0	0	0
Other, net									3,226	(1,711)	1,932
Net cash used in investing activities									(302,477)	(283,463)	(210,882)
Cash flows from financing activities
Common stock dividends									(103,305)	(87,767)	(93,599)
Preferred stock dividends of Hawaiian Electric and subsidiaries									(1,080)	(1,080)	(1,080)
Net proceeds from issuance of common stock									70,700	14,000	24,000
Proceeds from issuance of long-term debt									75,000	202,000	40,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds									(30,000)	(162,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less									(16,999)	3,499	(9,500)
Proceeds from other bank borrowings									25,000
Other									(377)	(2,506)	(276)
Net cash used in financing activities									18,939	(33,854)	(40,455)
Net decrease in cash and equivalents									14,673	(59,329)	45,107
Cash and cash equivalents, beginning of period				2,059				61,388	2,059	61,388	16,281
Cash and cash equivalents, end of period	16,732				2,059				16,732	2,059	61,388
Hawaii Electric Light Company, Inc. (HELCO)
Cash flows from operating activities
Net income (loss)									25,015	20,680	21,789
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings									0	0	0
Common stock dividends received from subsidiaries									0	0	0
Depreciation of property, plant and equipment									40,235	38,741	37,797
Other amortization									5,069	3,225	1,817
Deferred income taxes									(341)	3,954	7,027
Allowance for equity funds used during construction									(478)	(554)	(765)
Other									(213)	430	(750)
Changes in assets and liabilities
Decrease (increase) in accounts receivable									(4,867)	(359)	(718)
Increase in accrued unbilled revenues									(1,111)	(2,376)	(1,033)
Decrease (increase) in fuel oil stock									(2,329)	(469)	81
Decrease (increase) in materials and supplies									886	(661)	(515)
Decrease (increase) in regulatory assets									71	(4,007)	(1,243)
Increase (decrease) in accounts payable									6,104	(3,547)	768
Change in prepaid and accrued income taxes, tax credits and revenue taxes									(2,118)	7,961	2,645
Increase in defined benefit pension and other postretirement benefit plans liability									(760)	52	53
Changes in other assets and liabilities									8,186	(433)	(78)
Net cash provided by operating activities									73,349	62,637	66,875
Cash flows from investing activities
Capital expenditures									(54,553)	(52,077)	(51,344)
Contributions in aid of construction									3,499	4,293	3,412
Advances from (to) affiliates									0	3,500	12,000
Other, net									1,182	649	175
Net cash used in investing activities									(49,872)	(43,635)	(35,757)
Cash flows from financing activities
Common stock dividends									(15,289)	(24,796)	(22,507)
Preferred stock dividends of Hawaiian Electric and subsidiaries									(534)	(534)	(534)
Net proceeds from issuance of common stock									0	0
Proceeds from issuance of long-term debt									15,000	28,000	0
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds									(11,000)	(28,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less									0	0	0
Proceeds from other bank borrowings									0
Other									(56)	(396)	(10)
Net cash used in financing activities									(11,879)	(25,726)	(23,051)
Net decrease in cash and equivalents									11,598	(6,724)	8,067
Cash and cash equivalents, beginning of period				4,025				10,749	4,025	10,749	2,682
Cash and cash equivalents, end of period	15,623				4,025				15,623	4,025	10,749
Maui Electric Company, Limited (MECO)
Cash flows from operating activities
Net income (loss)									21,293	18,292	21,517
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings									0	0	0
Common stock dividends received from subsidiaries									0	0	0
Depreciation of property, plant and equipment									25,981	23,154	23,178
Other amortization									577	2,875	2,139
Deferred income taxes									2,165	8,004	12,661
Allowance for equity funds used during construction									(1,191)	(1,033)	(901)
Other									(324)	(342)	(433)
Changes in assets and liabilities
Decrease (increase) in accounts receivable									(8,614)	45	1,776
Increase in accrued unbilled revenues									(2,689)	(1,630)	(410)
Decrease (increase) in fuel oil stock									(1,443)	(2,241)	2,489
Decrease (increase) in materials and supplies									273	(1,660)	272
Decrease (increase) in regulatory assets									(3,011)	(4,854)	(869)
Increase (decrease) in accounts payable									3,506	5,762	(1,135)
Change in prepaid and accrued income taxes, tax credits and revenue taxes									3,047	5,362	(3,478)
Increase in defined benefit pension and other postretirement benefit plans liability									2,328	(157)	(168)
Changes in other assets and liabilities									7,794	166	(2,272)
Net cash provided by operating activities									49,692	51,743	54,366
Cash flows from investing activities
Capital expenditures									(60,779)	(50,242)	(32,668)
Contributions in aid of construction									2,272	2,913	3,077
Advances from (to) affiliates									12,000	(2,000)	(2,500)
Other, net									3,843	400	31
Net cash used in investing activities									(42,664)	(48,929)	(32,060)
Cash flows from financing activities
Common stock dividends									(12,019)	(11,946)	(25,261)
Preferred stock dividends of Hawaiian Electric and subsidiaries									(381)	(381)	(381)
Net proceeds from issuance of common stock									1,500	4,800	0
Proceeds from issuance of long-term debt									10,000	85,000	0
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds									(9,000)	(75,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less									0	0	0
Proceeds from other bank borrowings									0
Other									(39)	(1,003)	(1)
Net cash used in financing activities									(9,939)	1,470	(25,643)
Net decrease in cash and equivalents									(2,911)	4,284	(3,337)
Cash and cash equivalents, beginning of period				6,332				2,048	6,332	2,048	5,385
Cash and cash equivalents, end of period	3,421				6,332				3,421	6,332	2,048
Other subsidiaries
Cash flows from operating activities
Net income (loss)									0	0	0
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings									0	0	0
Common stock dividends received from subsidiaries									0	0	0
Depreciation of property, plant and equipment									0	0	0
Other amortization									0	0	0
Deferred income taxes									0	0	0
Allowance for equity funds used during construction									0	0	0
Other									0	0	0
Changes in assets and liabilities
Decrease (increase) in accounts receivable									0	0	0
Increase in accrued unbilled revenues									0	0	0
Decrease (increase) in fuel oil stock									0	0	0
Decrease (increase) in materials and supplies									0	0	0
Decrease (increase) in regulatory assets									0	0	0
Increase (decrease) in accounts payable									0	0	0
Change in prepaid and accrued income taxes, tax credits and revenue taxes									0	0	0
Increase in defined benefit pension and other postretirement benefit plans liability									0	0	0
Changes in other assets and liabilities									0	0	0
Net cash provided by operating activities									0	0	0
Cash flows from investing activities
Capital expenditures									0	0	0
Contributions in aid of construction									0	0	0
Advances from (to) affiliates									0	0	0
Other, net									0	0	0
Net cash used in investing activities									0	0	0
Cash flows from financing activities
Common stock dividends									0	0	0
Preferred stock dividends of Hawaiian Electric and subsidiaries									0	0	0
Net proceeds from issuance of common stock									0	0	0
Proceeds from issuance of long-term debt									0	0	0
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds									0	0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less									0	0	0
Proceeds from other bank borrowings									0
Other									0	0	0
Net cash used in financing activities									0	0	0
Net decrease in cash and equivalents									0	0	0
Cash and cash equivalents, beginning of period				101				101	101	101	101
Cash and cash equivalents, end of period	101				101				101	101	101
Consolidating adjustments
Cash flows from operating activities
Net income (loss)									(45,393)	(38,057)	(42,391)
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings									45,393	38,057	42,391
Common stock dividends received from subsidiaries									(27,308)	(36,742)	(47,768)
Depreciation of property, plant and equipment									0	0	0
Other amortization									0	0	0
Deferred income taxes									0	(263)	(23)
Allowance for equity funds used during construction									0	0	0
Other									0	0	0
Changes in assets and liabilities
Decrease (increase) in accounts receivable									14,220	1,411	(2,682)
Increase in accrued unbilled revenues									0	0	0
Decrease (increase) in fuel oil stock									0	0	0
Decrease (increase) in materials and supplies									0	0	0
Decrease (increase) in regulatory assets									0	0	0
Increase (decrease) in accounts payable									0	0	0
Change in prepaid and accrued income taxes, tax credits and revenue taxes									(331)	(177)	23
Increase in defined benefit pension and other postretirement benefit plans liability									0	0	0
Changes in other assets and liabilities									(14,220)	(1,411)	2,682
Net cash provided by operating activities									(27,639)	(37,182)	(47,768)
Cash flows from investing activities
Capital expenditures									0	0	0
Contributions in aid of construction									0	0	0
Advances from (to) affiliates									(12,000)	(1,500)	(9,500)
Other, net									1,831	5,240	0
Net cash used in investing activities									(10,169)	3,740	(9,500)
Cash flows from financing activities
Common stock dividends									27,308	36,742	47,768
Preferred stock dividends of Hawaiian Electric and subsidiaries									0	0	0
Net proceeds from issuance of common stock									(1,500)	(4,800)	0
Proceeds from issuance of long-term debt									0	0	0
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds									0	0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less									12,000	1,500	9,500
Proceeds from other bank borrowings									0
Other									0	0	0
Net cash used in financing activities									37,808	33,442	57,268
Net decrease in cash and equivalents									0	0	0
Cash and cash equivalents, beginning of period				0				0	0	0	0
Cash and cash equivalents, end of period	0				0				0	0	0
HECO Consolidated
Cash flows from operating activities
Net income (loss)	35,796	$ 50,210	$ 31,668	27,974	25,854	$ 47,985	$ 26,143	21,964	145,648	121,946	144,312
Adjustments to reconcile net income to net cash provided by operating activities
Equity in earnings									(100)	(100)	(100)
Common stock dividends received from subsidiaries									100	125	75
Depreciation of property, plant and equipment									203,626	192,784	187,061
Other amortization									26,602	8,498	6,935
Deferred income taxes									(7,982)	38,037	74,386
Allowance for equity funds used during construction									(10,877)	(12,483)	(8,325)
Other									(1,570)	(1,066)	(3,700)
Changes in assets and liabilities
Decrease (increase) in accounts receivable									(50,917)	2,914	8,551
Increase in accrued unbilled revenues									(14,684)	(15,361)	(7,184)
Decrease (increase) in fuel oil stock									6,938	(20,443)	4,786
Decrease (increase) in materials and supplies									(807)	(718)	750
Decrease (increase) in regulatory assets									9,252	(17,256)	(18,273)
Increase (decrease) in accounts payable									24,358	25,734	(10,614)
Change in prepaid and accrued income taxes, tax credits and revenue taxes									25,036	29,862	2,123
Increase in defined benefit pension and other postretirement benefit plans liability									18,746	604	484
Changes in other assets and liabilities									20,244	(17,891)	(11,350)
Net cash provided by operating activities									393,613	335,186	369,917
Cash flows from investing activities
Capital expenditures									(445,863)	(441,598)	(320,437)
Contributions in aid of construction									30,599	64,733	30,100
Advances from (to) affiliates									0	0	0
Other, net									10,082	4,578	2,138
Net cash used in investing activities									(405,182)	(372,287)	(288,199)
Cash flows from financing activities
Common stock dividends									(103,305)	(87,767)	(93,599)
Preferred stock dividends of Hawaiian Electric and subsidiaries									(1,995)	(1,995)	(1,995)
Net proceeds from issuance of common stock									70,700	14,000	24,000
Proceeds from issuance of long-term debt									100,000	315,000	40,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds									(50,000)	(265,000)	0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less									(4,999)	4,999	0
Proceeds from other bank borrowings									25,000
Other									(472)	(3,905)	(287)
Net cash used in financing activities									34,929	(24,668)	(31,881)
Net decrease in cash and equivalents									23,360	(61,769)	49,837
Cash and cash equivalents, beginning of period				$ 12,517				$ 74,286	12,517	74,286	24,449
Cash and cash equivalents, end of period	$ 35,877				$ 12,517				$ 35,877	$ 12,517	$ 74,286

Bank segment (HEI only) - State

Bank segment (HEI only) - Statements of Income Data (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest expense
Interest on deposit liabilities									$ 13,991	$ 9,660	$ 7,167
Total interest expense									104,216	91,128	88,558
Noninterest income
Revenues									2,614,831		2,380,654
Noninterest expense
Income before income taxes									254,461	276,580	373,841
Income taxes									50,797	109,393	123,695
Net income (loss)	$ 50,046	$ 66,371	$ 46,527	$ 40,720	$ 32,843	$ 60,544	$ 39,134	$ 34,666	203,664	167,187	250,146
American Savings Bank (ASB)
Interest and dividend income
Interest and fees on loans									220,463	207,255	199,774
Interest and dividends on investment securities									37,762	28,823	19,184
Total interest and dividend income									258,225	236,078	218,958
Interest expense
Interest on deposit liabilities									13,991	9,660	7,167
Interest on other borrowings									1,548	2,496	5,588
Total interest expense									15,539	12,156	12,755
Net interest income									242,686	223,922	206,203
Provision for loan losses									14,745	10,901	16,763
Net interest income after provision for loan losses									227,941	213,021	189,440
Noninterest income
Gains on sale of investment securities, net									0	0	598
Total noninterest income									56,050	61,562	66,966
Noninterest expense
Compensation and employee benefits									98,387	94,931	89,242
Occupancy									17,073	16,699	16,321
Data processing									14,268	13,280	13,030
Services									10,847	10,994	11,054
Equipment									7,186	7,232	6,938
Office supplies, printing and postage									6,134	6,182	6,075
Marketing									3,567	3,501	3,489
FDIC insurance									2,713	2,904	3,543
Other expense									17,238	20,144	19,362
Total noninterest expense									177,413	175,867	169,054
Income before income taxes									106,578	98,716	87,352
Income taxes									24,069	31,719	30,073
Net income (loss)									82,509	66,997	57,279
American Savings Bank (ASB) | Fees from other financial services
Noninterest income
Revenues									18,937	22,796	22,384
American Savings Bank (ASB) | Fee income on deposit liabilities
Noninterest income
Revenues									21,311	22,204	21,759
American Savings Bank (ASB) | Fee income on other financial products
Noninterest income
Revenues									7,052	7,205	8,707
American Savings Bank (ASB) | Bank-owned life insurance
Noninterest income
Revenues									5,057	5,539	4,637
American Savings Bank (ASB) | Mortgage banking income
Noninterest income
Revenues									1,493	2,201	6,625
American Savings Bank (ASB) | Other income, net
Noninterest income
Revenues									$ 2,200	$ 1,617	$ 2,256

Bank segment (HEI only) - Recon

Bank segment (HEI only) - Reconciliation of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Revenues	$ 761,650	$ 768,048	$ 685,277	$ 645,874	$ 658,597	$ 673,185	$ 632,281	$ 591,562	$ 2,860,849	$ 2,555,625	$ 2,380,654
Total interest expense									104,216	91,128	88,558
Less: Retirement defined benefits expense—other than service costs									(5,962)	(7,942)	(7,663)
Total expenses									2,527,493	2,209,392	2,024,816
Operating income	$ 84,604	$ 98,064	$ 78,799	$ 71,889	$ 87,220	$ 111,473	$ 77,802	$ 69,738	333,356	346,233	355,838
Add back: Retirement defined benefits expense—other than service costs									5,962	7,942	7,663
Income before income taxes									254,461	276,580	373,841
American Savings Bank (ASB)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Interest and dividend income									258,225	236,078	218,958
Noninterest income									56,050	61,562	66,966
Revenues									314,275	297,640	285,924
Total interest expense									15,539	12,156	12,755
Provision for loan losses									14,745	10,901	16,763
Noninterest expense									177,413	175,867	169,054
Less: Retirement defined benefits expense—other than service costs									(1,657)	(820)	(875)
Total expenses									206,040	198,104	197,697
Operating income									108,235	99,536	88,227
Add back: Retirement defined benefits expense—other than service costs									1,657	820	875
Income before income taxes									$ 106,578	$ 98,716	$ 87,352

Bank segment (HEI only) - Sta_2

Bank segment (HEI only) - Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Statement of Income Captions [Line Items]
Net income for common stock	$ 49,573	$ 65,900	$ 46,054	$ 40,247	$ 32,370	$ 60,073	$ 38,661	$ 34,193	$ 201,774	$ 165,297	$ 248,256
Net unrealized losses on available-for sale investment securities:
Net unrealized losses on available-for sale investment securities arising during the period, net of tax benefits of $3,468, $2,886 and $3,763 for 2018, 2017 and 2016, respectively									(9,472)	(4,370)	(5,699)
Reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil and $238 for 2018, 2017 and 2016, respectively									0	0	(360)
Retirement benefit plans:
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $1,108, $812 and $566 for 2018, 2017 and 2016, respectively									21,015	15,737	14,518
Other comprehensive income (loss), net of taxes									(8,669)	(1,372)	(6,867)
Comprehensive income attributable to Hawaiian Electric Company, Inc.									193,105	163,925	241,389
American Savings Bank (ASB)
Condensed Statement of Income Captions [Line Items]
Net income for common stock									82,509	66,997	57,279
Net unrealized losses on available-for sale investment securities:
Net unrealized losses on available-for sale investment securities arising during the period, net of tax benefits of $3,468, $2,886 and $3,763 for 2018, 2017 and 2016, respectively									(9,472)	(4,370)	(5,699)
Reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil and $238 for 2018, 2017 and 2016, respectively									0	0	(360)
Retirement benefit plans:
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $1,108, $812 and $566 for 2018, 2017 and 2016, respectively									2,353	1,231	857
Other comprehensive income (loss), net of taxes									(7,119)	(3,139)	(5,202)
Comprehensive income attributable to Hawaiian Electric Company, Inc.									$ 75,390	$ 63,858	$ 52,077

Bank segment (HEI only) - Sta_3

Bank segment (HEI only) - Statements of Comprehensive Income - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Statement of Income Captions [Line Items]
Net unrealized loss on available-for-sale securities, tax benefits	$ 3,468	$ 2,886	$ 3,763
Reclassification adjustment for net realized gains included in net income, tax expenses	0	0	238
Net gains (losses) arising during the period, retirement benefits, taxes	9,810	(41,129)	27,703
Amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits	7,317	10,041	9,267
American Savings Bank (ASB)
Condensed Statement of Income Captions [Line Items]
Net unrealized loss on available-for-sale securities, tax benefits	3,468	2,886	3,763
Reclassification adjustment for net realized gains included in net income, tax expenses	0	0	238
Net gains (losses) arising during the period, retirement benefits, taxes	0	0	0
Amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits	$ 1,108	$ 812	$ 566

Bank segment (HEI only) - Balan

Bank segment (HEI only) - Balance Sheets Data (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 169,208	$ 261,881	$ 278,452	$ 300,478
Investment securities
Available-for-sale, at fair value	1,388,533	1,401,198
Held-to-maturity, at amortized cost (fair value of $142,057 and $44,412 at December 31, 2018 and 2017, respectively)	141,875	44,515
Stock in Federal Home Loan Bank, at cost	9,958	9,706
Allowance for loan losses	(52,119)	(53,637)
Total loans, net	4,790,902	4,617,131
Loans held for sale, at lower of cost or fair value	1,805	11,250
Other	530,364	513,535
Goodwill	82,190	82,190
Total assets	13,104,051	12,534,160	11,881,981
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other	580,788	521,018
Total liabilities	10,907,478	10,402,481
Commitments and contingencies
Retained earnings	543,623	476,836
Net unrealized losses on securities	(24,423)	(14,951)
Accumulated other comprehensive loss, net of tax benefits	(50,610)	(41,941)
Total shareholders’ equity	2,162,280	2,097,386	$ 2,066,753	$ 1,927,640
Total capitalization and liabilities	13,104,051	12,534,160
Other assets
Premises and equipment, net	4,830,118	4,460,248
Total other assets	530,364	513,535
Other liabilities
Total other liabilities	580,788	521,018
Held-to-maturity investment securities	142,057	44,412
American Savings Bank (ASB)
Assets
Cash and due from banks	122,059	140,934
Interest-bearing deposits	4,225	93,165
Investment securities
Available-for-sale, at fair value	1,388,533	1,401,198
Held-to-maturity, at amortized cost (fair value of $142,057 and $44,412 at December 31, 2018 and 2017, respectively)	141,875	44,515
Stock in Federal Home Loan Bank, at cost	9,958	9,706
Loans held for investment	4,843,021	4,670,768
Allowance for loan losses	(52,119)	(53,637)
Total loans, net	4,790,902	4,617,131
Loans held for sale, at lower of cost or fair value	1,805	11,250
Other	486,347	398,570
Goodwill	82,190	82,190
Total assets	7,027,894	6,798,659
LIABILITIES AND SHAREHOLDERS’ EQUITY
Deposit liabilities–noninterest-bearing	1,800,727	1,760,233
Deposit liabilities–interest-bearing	4,358,125	4,130,364
Other borrowings	110,040	190,859
Other	124,613	110,356
Total liabilities	6,393,505	6,191,812
Commitments and contingencies
Common stock	1	1
Additional paid in capital	347,170	345,018
Retained earnings	325,286	292,957
Net unrealized losses on securities	(24,423)	(14,951)
Retirement benefit plans	(13,645)	(16,178)
Accumulated other comprehensive loss, net of tax benefits	(38,068)	(31,129)
Total shareholders’ equity	634,389	606,847
Total capitalization and liabilities	7,027,894	6,798,659
Other assets
Bank-owned life insurance	151,172	148,775
Premises and equipment, net	214,415	136,270
Accrued interest receivable	20,140	18,724
Mortgage servicing rights	8,062	8,639
Low-income housing investments	67,626	59,016
Real estate acquired in settlement of loans, net	406	133
Other	24,526	27,013
Total other assets	486,347	398,570
Other liabilities
Accrued expenses	54,084	39,312
Federal and state income taxes payable	2,012	3,736
Cashier’s checks	26,906	27,000
Advance payments by borrowers	10,183	10,245
Other	31,428	30,063
Total other liabilities	124,613	110,356
Held-to-maturity investment securities	$ 142,057	$ 44,412

Bank segment (HEI only) - Avail

Bank segment (HEI only) - Available For Sale Investment Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)issue	Dec. 31, 2017USD ($)issue
Available-for-sale
Total amortized cost	$ 1,421,897	$ 1,421,622
Gross unrealized gains	954	1,231
Gross unrealized losses	(34,318)	(21,655)
Available-for-sale investment securities	$ 1,388,533	$ 1,401,198
Number of issues, less than 12 months | issue	33	82
Fair value, less than 12 months	$ 178,068	$ 736,772
Gross unrealized losses, less than 12 months	$ (1,907)	$ (7,664)
Number of issues, more than 12 months | issue	164	85
Fair value, 12 months or longer	$ 1,066,295	$ 522,208
Gross unrealized losses, 12 months or longer	(32,411)	(13,991)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Debt Securities, Held-to-maturity	141,875	44,515
Gross unrealized gains	1,446	1
Gross unrealized losses	(1,264)	(104)
Held-to-maturity investment securities	$ 142,057	$ 44,412
Number of issues, less than 12 months | issue	3	2
Fair value, less than 12 months	$ 29,814	$ 35,744
Gross unrealized losses, less than 12 months	$ (400)	$ (104)
Number of issues, more than 12 months | issue	2	0
Fair value, 12 months or longer	$ 31,505	$ 0
Gross unrealized losses, 12 months or longer	(864)	0
U.S. Treasury and federal agency obligations
Available-for-sale
Total amortized cost	156,694	185,891
Gross unrealized gains	62	438
Gross unrealized losses	(2,407)	(2,031)
Available-for-sale investment securities	$ 154,349	$ 184,298
Number of issues, less than 12 months | issue	5	15
Fair value, less than 12 months	$ 25,882	$ 83,137
Gross unrealized losses, less than 12 months	$ (208)	$ (825)
Number of issues, more than 12 months | issue	19	8
Fair value, 12 months or longer	$ 118,405	$ 62,296
Gross unrealized losses, 12 months or longer	(2,199)	(1,206)
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies
Available-for-sale
Total amortized cost	1,192,169	1,220,304
Gross unrealized gains	789	793
Gross unrealized losses	(31,542)	(19,624)
Available-for-sale investment securities	$ 1,161,416	$ 1,201,473
Number of issues, less than 12 months | issue	22	67
Fair value, less than 12 months	$ 129,011	$ 653,635
Gross unrealized losses, less than 12 months	$ (1,330)	$ (6,839)
Number of issues, more than 12 months | issue	145	77
Fair value, 12 months or longer	$ 947,890	$ 459,912
Gross unrealized losses, 12 months or longer	(30,212)	(12,785)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Debt Securities, Held-to-maturity	141,875	44,515
Gross unrealized gains	1,446	1
Gross unrealized losses	(1,264)	(104)
Held-to-maturity investment securities	$ 142,057	$ 44,412
Number of issues, less than 12 months | issue	3	2
Fair value, less than 12 months	$ 29,814	$ 35,744
Gross unrealized losses, less than 12 months	$ (400)	$ (104)
Number of issues, more than 12 months | issue	2	0
Fair value, 12 months or longer	$ 31,505	$ 0
Gross unrealized losses, 12 months or longer	(864)	0
Corporate bonds
Available-for-sale
Total amortized cost	49,398
Gross unrealized gains	103
Gross unrealized losses	(369)
Available-for-sale investment securities	$ 49,132
Number of issues, less than 12 months | issue	6
Fair value, less than 12 months	$ 23,175
Gross unrealized losses, less than 12 months	$ (369)
Number of issues, more than 12 months | issue	0
Fair value, 12 months or longer	$ 0
Gross unrealized losses, 12 months or longer	0
Mortgage revenue bonds
Available-for-sale
Total amortized cost	23,636	15,427
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Available-for-sale investment securities	$ 23,636	$ 15,427
Number of issues, less than 12 months | issue	0	0
Fair value, less than 12 months	$ 0	$ 0
Gross unrealized losses, less than 12 months	$ 0	$ 0
Number of issues, more than 12 months | issue	0	0
Fair value, 12 months or longer	$ 0	$ 0
Gross unrealized losses, 12 months or longer	0	0
American Savings Bank (ASB)
Available-for-sale securities
Payments to acquire new campus project	76,500
Available-for-sale
Available-for-sale investment securities	1,388,533	1,401,198
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Debt Securities, Held-to-maturity	141,875	44,515
Held-to-maturity investment securities	$ 142,057	$ 44,412

Bank segment (HEI only) - Inves

Bank segment (HEI only) - Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amortized Cost
Due in one year or less	$ 20,002
Due after one year through five years	117,549
Due after five years through ten years	76,750
Due after ten years	15,427
Amortized cost, available-for-sale securities with a single maturity date	229,728
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost	1,192,169
Total amortized cost	1,421,897	$ 1,421,622
Mortgage-related securities-FNMA, FHLMC and GNMA, amortized cost basis	141,875
Debt Securities, Held-to-maturity	141,875	44,515
Fair value
Due in one year or less	19,955
Due after one year through five years	116,508
Due after five years through ten years	75,227
Due after ten years	15,427
Available-for-sale securities with a single maturity date	227,117
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value	1,161,416
Total fair value	1,388,533	1,401,198
Mortgage-related securities - FNMA, FHLMC and GNMA, Fair Value	142,057
Held-to-maturity securities, Fair Value	142,057	44,412
Gains (losses) from sales of available-for-sale investments
Proceeds	0	0	$ 16,423
Interest income from taxable and non-taxable investment securities
Taxable	37,153	28,398	19,166
Non-taxable	609	425	18
Total	37,762	28,823	19,184
Available-for-sale securities pledged at carrying value	546,100	411,400
Available-for-sale securities, pledged at carrying value as collateral for securities sold under agreements to repurchase	92,000	165,100
Stock in Federal Home Loan Bank, at cost	9,958	9,706
FHLB Des Moines
Interest income from taxable and non-taxable investment securities
Stock in Federal Home Loan Bank, at cost	10,000	9,700
Mortgage-related securities - FNMA, FHLMC and GNMA
Gains (losses) from sales of available-for-sale investments
Proceeds	0	0	16,400
Gross gains	0	0	600
Gross losses	$ 0	$ 0	$ 0

Bank segment (HEI only) - Loans

Bank segment (HEI only) - Loans Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans receivable
Loans Receivable	$ 4,843,634	$ 4,671,577
Less: Deferred fees and discounts	(613)	(809)
Allowance for loan losses	(52,119)	(53,637)
Total loans, net	4,790,902	4,617,131
Real estate loans
Loans receivable
Loans Receivable	3,989,741	3,903,185
Residential 1-4 family
Loans receivable
Loans Receivable	2,143,397	2,118,047
Commercial real estate
Loans receivable
Loans Receivable	748,398	733,106
Home equity line of credit
Loans receivable
Loans Receivable	978,237	913,052
Residential land
Loans receivable
Loans Receivable	13,138	15,797
Commercial construction
Loans receivable
Loans Receivable	92,264	108,273
Residential construction
Loans receivable
Loans Receivable	14,307	14,910
Commercial
Loans receivable
Loans Receivable	587,891	544,828
Consumer
Loans receivable
Loans Receivable	$ 266,002	$ 223,564

Bank segment (HEI only) - Loa_2

Bank segment (HEI only) - Loans Receivable, Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Bank Segment Disclosure [Abstract]
Percentage of benchmark loan to appraisal ratio in excess of which mortgage insurance is required	80.00%
Real estate loans for investors	$ 1,200	$ 1,200	$ 1,200
Loans pledged as collateral to secure advances from the FHLB of Des Moines	2,700	2,400
Loans to directors, executive directors, affiliates and any related interest of such individuals	24	23.8
Loan balances, related interests of individuals who are directors	$ 18.3	$ 18.7

Bank segment (HEI only) - Allow

Bank segment (HEI only) - Allowance For Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for loan losses:
Valuation allowance, balance at the beginning of the period	$ 53,637	$ 55,533	$ 50,038
Charge-offs	(20,517)	(16,813)	(14,245)
Recoveries	4,254	4,016	2,977
Provision	14,745	10,901	16,763
Valuation allowance, balance at the end of the period	52,119	53,637	55,533
Ending balance: individually evaluated for impairment	2,222	2,730	4,083
Ending balance: collectively evaluated for impairment	49,897	50,907	51,450
Financing Receivables:
Total financing receivables	4,843,634	4,671,577	4,743,619
Ending balance: individually evaluated for impairment	39,697	33,393	51,759
Ending balance: collectively evaluated for impairment	4,803,937	4,638,184	4,691,860
Residential 1-4 family
Allowance for loan losses:
Valuation allowance, balance at the beginning of the period	2,902	2,873	4,186
Charge-offs	(128)	(826)	(639)
Recoveries	74	157	421
Provision	(872)	698	(1,095)
Valuation allowance, balance at the end of the period	1,976	2,902	2,873
Ending balance: individually evaluated for impairment	876	1,248	1,352
Ending balance: collectively evaluated for impairment	1,100	1,654	1,521
Financing Receivables:
Total financing receivables	2,143,397	2,118,047	2,048,051
Ending balance: individually evaluated for impairment	16,494	18,284	19,854
Ending balance: collectively evaluated for impairment	2,126,903	2,099,763	2,028,197
Commercial real estate
Allowance for loan losses:
Valuation allowance, balance at the beginning of the period	15,796	16,004	11,342
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	(1,291)	(208)	4,662
Valuation allowance, balance at the end of the period	14,505	15,796	16,004
Ending balance: individually evaluated for impairment	7	65	80
Ending balance: collectively evaluated for impairment	14,498	15,731	15,924
Financing Receivables:
Total financing receivables	748,398	733,106	800,395
Ending balance: individually evaluated for impairment	915	1,016	1,569
Ending balance: collectively evaluated for impairment	747,483	732,090	798,826
Home equity line of credit
Allowance for loan losses:
Valuation allowance, balance at the beginning of the period	7,522	5,039	7,260
Charge-offs	(353)	(14)	(112)
Recoveries	257	308	59
Provision	(1,055)	2,189	(2,168)
Valuation allowance, balance at the end of the period	6,371	7,522	5,039
Ending balance: individually evaluated for impairment	701	647	215
Ending balance: collectively evaluated for impairment	5,670	6,875	4,824
Financing Receivables:
Total financing receivables	978,237	913,052	863,163
Ending balance: individually evaluated for impairment	14,800	8,188	6,158
Ending balance: collectively evaluated for impairment	963,437	904,864	857,005
Residential land
Allowance for loan losses:
Valuation allowance, balance at the beginning of the period	896	1,738	1,671
Charge-offs	(18)	(210)	(138)
Recoveries	179	482	461
Provision	(578)	(1,114)	(256)
Valuation allowance, balance at the end of the period	479	896	1,738
Ending balance: individually evaluated for impairment	6	47	789
Ending balance: collectively evaluated for impairment	473	849	949
Financing Receivables:
Total financing receivables	13,138	15,797	18,889
Ending balance: individually evaluated for impairment	2,059	1,265	3,629
Ending balance: collectively evaluated for impairment	11,079	14,532	15,260
Commercial construction
Allowance for loan losses:
Valuation allowance, balance at the beginning of the period	4,671	6,449	4,461
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	(1,881)	(1,778)	1,988
Valuation allowance, balance at the end of the period	2,790	4,671	6,449
Ending balance: individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	2,790	4,671	6,449
Financing Receivables:
Total financing receivables	92,264	108,273	126,768
Ending balance: individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	92,264	108,273	126,768
Residential construction
Allowance for loan losses:
Valuation allowance, balance at the beginning of the period	12	12	13
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	(8)	0	(1)
Valuation allowance, balance at the end of the period	4	12	12
Ending balance: individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	4	12	12
Financing Receivables:
Total financing receivables	14,307	14,910	16,080
Ending balance: individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	14,307	14,910	16,080
Commercial
Allowance for loan losses:
Valuation allowance, balance at the beginning of the period	10,851	16,618	17,208
Charge-offs	(2,722)	(4,006)	(5,943)
Recoveries	2,136	1,852	1,093
Provision	(1,040)	(3,613)	4,260
Valuation allowance, balance at the end of the period	9,225	10,851	16,618
Ending balance: individually evaluated for impairment	628	694	1,641
Ending balance: collectively evaluated for impairment	8,597	10,157	14,977
Financing Receivables:
Total financing receivables	587,891	544,828	692,051
Ending balance: individually evaluated for impairment	5,340	4,574	20,539
Ending balance: collectively evaluated for impairment	582,551	540,254	671,512
Consumer
Allowance for loan losses:
Valuation allowance, balance at the beginning of the period	10,987	6,800	3,897
Charge-offs	(17,296)	(11,757)	(7,413)
Recoveries	1,608	1,217	943
Provision	21,470	14,727	9,373
Valuation allowance, balance at the end of the period	16,769	10,987	6,800
Ending balance: individually evaluated for impairment	4	29	6
Ending balance: collectively evaluated for impairment	16,765	10,958	6,794
Financing Receivables:
Total financing receivables	266,002	223,564	178,222
Ending balance: individually evaluated for impairment	89	66	10
Ending balance: collectively evaluated for impairment	$ 265,913	$ 223,498	$ 178,212

Bank segment (HEI only) - Credi

Bank segment (HEI only) - Credit Risk Profile by Internally Assigned Grade for Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Credit risk profile by internally assigned grade for loans
Total financing receivables	$ 4,843,634	$ 4,671,577	$ 4,743,619
Loans, Excluding Consumer Loans
Credit risk profile by internally assigned grade for loans
Total financing receivables	1,428,553	1,386,207
Loans, Excluding Consumer Loans | Pass
Credit risk profile by internally assigned grade for loans
Total financing receivables	1,295,902	1,207,576
Loans, Excluding Consumer Loans | Special mention
Credit risk profile by internally assigned grade for loans
Total financing receivables	44,469	99,844
Loans, Excluding Consumer Loans | Substandard
Credit risk profile by internally assigned grade for loans
Total financing receivables	88,182	78,319
Loans, Excluding Consumer Loans | Doubtful
Credit risk profile by internally assigned grade for loans
Total financing receivables	0	468
Loans, Excluding Consumer Loans | Loss
Credit risk profile by internally assigned grade for loans
Total financing receivables	0	0
Commercial real estate
Credit risk profile by internally assigned grade for loans
Total financing receivables	748,398	733,106	800,395
Commercial real estate | Pass
Credit risk profile by internally assigned grade for loans
Total financing receivables	658,288	630,877
Commercial real estate | Special mention
Credit risk profile by internally assigned grade for loans
Total financing receivables	32,871	49,347
Commercial real estate | Substandard
Credit risk profile by internally assigned grade for loans
Total financing receivables	57,239	52,882
Commercial real estate | Doubtful
Credit risk profile by internally assigned grade for loans
Total financing receivables	0	0
Commercial real estate | Loss
Credit risk profile by internally assigned grade for loans
Total financing receivables	0	0
Commercial construction
Credit risk profile by internally assigned grade for loans
Total financing receivables	92,264	108,273	126,768
Commercial construction | Pass
Credit risk profile by internally assigned grade for loans
Total financing receivables	89,974	83,757
Commercial construction | Special mention
Credit risk profile by internally assigned grade for loans
Total financing receivables	0	22,500
Commercial construction | Substandard
Credit risk profile by internally assigned grade for loans
Total financing receivables	2,290	2,016
Commercial construction | Doubtful
Credit risk profile by internally assigned grade for loans
Total financing receivables	0	0
Commercial construction | Loss
Credit risk profile by internally assigned grade for loans
Total financing receivables	0	0
Commercial
Credit risk profile by internally assigned grade for loans
Total financing receivables	587,891	544,828	$ 692,051
Commercial | Pass
Credit risk profile by internally assigned grade for loans
Total financing receivables	547,640	492,942
Commercial | Special mention
Credit risk profile by internally assigned grade for loans
Total financing receivables	11,598	27,997
Commercial | Substandard
Credit risk profile by internally assigned grade for loans
Total financing receivables	28,653	23,421
Commercial | Doubtful
Credit risk profile by internally assigned grade for loans
Total financing receivables	0	468
Commercial | Loss
Credit risk profile by internally assigned grade for loans
Total financing receivables	$ 0	$ 0

Bank segment (HEI only) - Cre_2

Bank segment (HEI only) - Credit Risk Profile Based on Payment Activity for Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Credit risk profile based on payment activity for loans
Total past due	$ 25,969	$ 23,603
Current	4,817,665	4,647,974
Total financing receivables	4,843,634	4,671,577	$ 4,743,619
Recorded Investment greater than 90 days and accruing	0	0
Residential 1-4 family
Credit risk profile based on payment activity for loans
Total past due	8,869	8,318
Current	2,134,528	2,109,729
Total financing receivables	2,143,397	2,118,047	2,048,051
Recorded Investment greater than 90 days and accruing	0	0
Commercial real estate
Credit risk profile based on payment activity for loans
Total past due	0	0
Current	748,398	733,106
Total financing receivables	748,398	733,106	800,395
Recorded Investment greater than 90 days and accruing	0	0
Home equity line of credit
Credit risk profile based on payment activity for loans
Total past due	4,540	2,590
Current	973,697	910,462
Total financing receivables	978,237	913,052	863,163
Recorded Investment greater than 90 days and accruing	0	0
Residential land
Credit risk profile based on payment activity for loans
Total past due	328	648
Current	12,810	15,149
Total financing receivables	13,138	15,797	18,889
Recorded Investment greater than 90 days and accruing	0	0
Commercial construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Current	92,264	108,273
Total financing receivables	92,264	108,273	126,768
Recorded Investment greater than 90 days and accruing	0	0
Residential construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Current	14,307	14,910
Total financing receivables	14,307	14,910	16,080
Recorded Investment greater than 90 days and accruing	0	0
Commercial
Credit risk profile based on payment activity for loans
Total past due	1,144	4,580
Current	586,747	540,248
Total financing receivables	587,891	544,828	692,051
Recorded Investment greater than 90 days and accruing	0	0
Consumer
Credit risk profile based on payment activity for loans
Total past due	11,088	7,467
Current	254,914	216,097
Total financing receivables	266,002	223,564	$ 178,222
Recorded Investment greater than 90 days and accruing	0	0
30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	10,440	7,237
30-59 days past due | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total past due	3,757	1,532
30-59 days past due | Commercial real estate
Credit risk profile based on payment activity for loans
Total past due	0	0
30-59 days past due | Home equity line of credit
Credit risk profile based on payment activity for loans
Total past due	1,139	425
30-59 days past due | Residential land
Credit risk profile based on payment activity for loans
Total past due	9	23
30-59 days past due | Commercial construction
Credit risk profile based on payment activity for loans
Total past due	0	0
30-59 days past due | Residential construction
Credit risk profile based on payment activity for loans
Total past due	0	0
30-59 days past due | Commercial
Credit risk profile based on payment activity for loans
Total past due	315	1,825
30-59 days past due | Consumer
Credit risk profile based on payment activity for loans
Total past due	5,220	3,432
60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	6,901	6,013
60-89 days past due | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total past due	2,773	1,715
60-89 days past due | Commercial real estate
Credit risk profile based on payment activity for loans
Total past due	0	0
60-89 days past due | Home equity line of credit
Credit risk profile based on payment activity for loans
Total past due	681	114
60-89 days past due | Residential land
Credit risk profile based on payment activity for loans
Total past due	0	0
60-89 days past due | Commercial construction
Credit risk profile based on payment activity for loans
Total past due	0	0
60-89 days past due | Residential construction
Credit risk profile based on payment activity for loans
Total past due	0	0
60-89 days past due | Commercial
Credit risk profile based on payment activity for loans
Total past due	281	2,025
60-89 days past due | Consumer
Credit risk profile based on payment activity for loans
Total past due	3,166	2,159
Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	8,628	10,353
Greater than 90 days | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total past due	2,339	5,071
Greater than 90 days | Commercial real estate
Credit risk profile based on payment activity for loans
Total past due	0	0
Greater than 90 days | Home equity line of credit
Credit risk profile based on payment activity for loans
Total past due	2,720	2,051
Greater than 90 days | Residential land
Credit risk profile based on payment activity for loans
Total past due	319	625
Greater than 90 days | Commercial construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Greater than 90 days | Residential construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Greater than 90 days | Commercial
Credit risk profile based on payment activity for loans
Total past due	548	730
Greater than 90 days | Consumer
Credit risk profile based on payment activity for loans
Total past due	$ 2,702	$ 1,876

Bank segment (HEI only) - Cre_3

Bank segment (HEI only) - Credit Risk Profile Based on Aging Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Credit risk profile based on nonaccrual loans
Nonaccrual loans	$ 27,295	$ 23,591
Accruing loans 90 days or more past due	0	0
Troubled debt restructured loans not included above	25,917	20,814
Residential 1-4 family
Credit risk profile based on nonaccrual loans
Nonaccrual loans	12,037	12,598
Accruing loans 90 days or more past due	0	0
Troubled debt restructured loans not included above	10,194	10,982
Commercial real estate
Credit risk profile based on nonaccrual loans
Nonaccrual loans	0	0
Accruing loans 90 days or more past due	0	0
Troubled debt restructured loans not included above	915	1,016
Home equity line of credit
Credit risk profile based on nonaccrual loans
Nonaccrual loans	6,348	4,466
Accruing loans 90 days or more past due	0	0
Troubled debt restructured loans not included above	11,597	6,584
Residential land
Credit risk profile based on nonaccrual loans
Nonaccrual loans	436	841
Accruing loans 90 days or more past due	0	0
Troubled debt restructured loans not included above	1,622	425
Commercial construction
Credit risk profile based on nonaccrual loans
Nonaccrual loans	0	0
Accruing loans 90 days or more past due	0	0
Troubled debt restructured loans not included above	0	0
Residential construction
Credit risk profile based on nonaccrual loans
Nonaccrual loans	0	0
Accruing loans 90 days or more past due	0	0
Troubled debt restructured loans not included above	0	0
Commercial
Credit risk profile based on nonaccrual loans
Nonaccrual loans	4,278	3,069
Accruing loans 90 days or more past due	0	0
Troubled debt restructured loans not included above	1,527	1,741
Consumer
Credit risk profile based on nonaccrual loans
Nonaccrual loans	4,196	2,617
Accruing loans 90 days or more past due	0	0
Troubled debt restructured loans not included above	$ 62	$ 66

Bank segment (HEI only) - Carry

Bank segment (HEI only) - Carrying Amount of Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Recorded investment:
With no related allowance recorded	$ 16,349	$ 14,072
With an allowance recorded	23,348	19,321
Recorded investment	39,697	33,393
Unpaid principal balance:
With no related allowance recorded	18,372	16,041
With an allowance recorded	23,580	19,574
Unpaid principal balance	41,952	35,615
Related Allowance	2,222	2,730
Average recorded investment, with no related allowance recorded	15,630	15,378	$ 22,579
Average recorded investment, with an allowance recorded	22,360	21,160	36,398
Average recorded investment	37,990	36,538	58,977
Interest income recognized, with no related allowance recorded	588	599	783
Interest income recognized, with an allowance recorded	974	1,621	1,271
Interest income recognized	1,562	2,220	2,054
Residential 1-4 family
Recorded investment:
With no related allowance recorded	7,822	9,097
With an allowance recorded	8,672	9,187
Recorded investment	16,494	18,284
Unpaid principal balance:
With no related allowance recorded	8,333	9,644
With an allowance recorded	8,875	9,390
Unpaid principal balance	17,208	19,034
Related Allowance	876	1,248
Average recorded investment, with no related allowance recorded	8,595	9,440	10,136
Average recorded investment, with an allowance recorded	8,878	9,818	11,589
Average recorded investment	17,473	19,258	21,725
Interest income recognized, with no related allowance recorded	445	316	324
Interest income recognized, with an allowance recorded	363	493	457
Interest income recognized	808	809	781
Commercial real estate
Recorded investment:
With no related allowance recorded	0	0
With an allowance recorded	915	1,016
Recorded investment	915	1,016
Unpaid principal balance:
With no related allowance recorded	0	0
With an allowance recorded	915	1,016
Unpaid principal balance	915	1,016
Related Allowance	7	65
Average recorded investment, with no related allowance recorded	0	91	1,124
Average recorded investment, with an allowance recorded	982	1,241	1,962
Average recorded investment	982	1,332	3,086
Interest income recognized, with no related allowance recorded	0	11	0
Interest income recognized, with an allowance recorded	42	54	15
Interest income recognized	42	65	15
Home equity line of credit
Recorded investment:
With no related allowance recorded	2,743	1,496
With an allowance recorded	12,057	6,692
Recorded investment	14,800	8,188
Unpaid principal balance:
With no related allowance recorded	3,004	1,789
With an allowance recorded	12,086	6,736
Unpaid principal balance	15,090	8,525
Related Allowance	701	647
Average recorded investment, with no related allowance recorded	2,206	1,976	1,105
Average recorded investment, with an allowance recorded	10,617	5,045	3,765
Average recorded investment	12,823	7,021	4,870
Interest income recognized, with no related allowance recorded	75	101	23
Interest income recognized, with an allowance recorded	440	251	137
Interest income recognized	515	352	160
Residential land
Recorded investment:
With no related allowance recorded	2,030	1,143
With an allowance recorded	29	122
Recorded investment	2,059	1,265
Unpaid principal balance:
With no related allowance recorded	2,228	1,434
With an allowance recorded	29	122
Unpaid principal balance	2,257	1,556
Related Allowance	6	47
Average recorded investment, with no related allowance recorded	1,532	1,094	1,518
Average recorded investment, with an allowance recorded	37	1,308	2,964
Average recorded investment	1,569	2,402	4,482
Interest income recognized, with no related allowance recorded	40	117	66
Interest income recognized, with an allowance recorded	3	97	206
Interest income recognized	43	214	272
Commercial construction
Recorded investment:
With no related allowance recorded	0	0
With an allowance recorded	0	0
Recorded investment	0	0
Unpaid principal balance:
With no related allowance recorded	0	0
With an allowance recorded	0	0
Unpaid principal balance	0	0
Related Allowance	0	0
Average recorded investment, with no related allowance recorded	0	0	0
Average recorded investment, with an allowance recorded	0	0	0
Average recorded investment	0	0	0
Interest income recognized, with no related allowance recorded	0	0	0
Interest income recognized, with an allowance recorded	0	0	0
Interest income recognized	0	0	0
Residential construction
Recorded investment:
With no related allowance recorded	0	0
With an allowance recorded	0	0
Recorded investment	0	0
Unpaid principal balance:
With no related allowance recorded	0	0
With an allowance recorded	0	0
Unpaid principal balance	0	0
Related Allowance	0	0
Average recorded investment, with no related allowance recorded	0	0	0
Average recorded investment, with an allowance recorded	0	0	0
Average recorded investment	0	0	0
Interest income recognized, with no related allowance recorded	0	0	0
Interest income recognized, with an allowance recorded	0	0	0
Interest income recognized	0	0	0
Commercial
Recorded investment:
With no related allowance recorded	3,722	2,328
With an allowance recorded	1,618	2,246
Recorded investment	5,340	4,574
Unpaid principal balance:
With no related allowance recorded	4,775	3,166
With an allowance recorded	1,618	2,252
Unpaid principal balance	6,393	5,418
Related Allowance	628	694
Average recorded investment, with no related allowance recorded	3,275	2,776	8,694
Average recorded investment, with an allowance recorded	1,789	3,691	16,106
Average recorded investment	5,064	6,467	24,800
Interest income recognized, with no related allowance recorded	28	54	370
Interest income recognized, with an allowance recorded	122	723	456
Interest income recognized	150	777	826
Consumer
Recorded investment:
With no related allowance recorded	32	8
With an allowance recorded	57	58
Recorded investment	89	66
Unpaid principal balance:
With no related allowance recorded	32	8
With an allowance recorded	57	58
Unpaid principal balance	89	66
Related Allowance	4	29
Average recorded investment, with no related allowance recorded	22	1	2
Average recorded investment, with an allowance recorded	57	57	12
Average recorded investment	79	58	14
Interest income recognized, with no related allowance recorded	0	0	0
Interest income recognized, with an allowance recorded	4	3	0
Interest income recognized	$ 4	$ 3	$ 0

Bank segment (HEI only) - TDR N

Bank segment (HEI only) - TDR Narrative (Details) - Residential land	12 Months Ended
	Dec. 31, 2018
Troubled debt restructurings
Period of interest-only monthly payment term loan	3 years
Maximum
Troubled debt restructurings
Extension of maturity date	5 years

Bank segment (HEI only) - Loan

Bank segment (HEI only) - Loan Modifications (Details)	12 Months Ended
	Dec. 31, 2018USD ($)contract	Dec. 31, 2017USD ($)contract	Dec. 31, 2016USD ($)contract
Loan modifications determined to be troubled debt restructurings
Commitments to borrowers whose loan terms are impaired or modified under troubled debt restructuring	$ 0	$ 0
Troubled debt restructurings real estate loans
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	81	64	67
Pre-modification outstanding recorded investment	$ 12,920,000	$ 4,798,000	$ 26,937,000
Post-modification outstanding recorded investment	12,961,000	4,792,000	27,052,000
Net increase in ALLL	$ 1,413,000	$ 877,000	$ 1,756,000
Minimum period of payment default of loans determined to be TDRs	90 days	90 days	90 days
Troubled debt restructurings real estate loans | Residential 1-4 family
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	5	7	14
Pre-modification outstanding recorded investment	$ 1,107,000	$ 742,000	$ 3,131,000
Post-modification outstanding recorded investment	1,133,000	750,000	3,245,000
Net increase in ALLL	$ 17,000	$ 45,000	$ 337,000
Troubled debt restructurings real estate loans | Commercial real estate
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	0	0	0
Pre-modification outstanding recorded investment	$ 0	$ 0	$ 0
Post-modification outstanding recorded investment	0	0	0
Net increase in ALLL	$ 0	$ 0	$ 0
Troubled debt restructurings real estate loans | Home equity line of credit
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	58	46	36
Pre-modification outstanding recorded investment	$ 7,487,000	$ 3,016,000	$ 3,337,000
Post-modification outstanding recorded investment	7,492,000	3,002,000	3,337,000
Net increase in ALLL	$ 1,220,000	$ 557,000	$ 554,000
Troubled debt restructurings real estate loans | Residential land
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	5	1	2
Pre-modification outstanding recorded investment	$ 1,776,000	$ 92,000	$ 203,000
Post-modification outstanding recorded investment	1,786,000	92,000	204,000
Net increase in ALLL	$ 0	$ 0	$ 0
Troubled debt restructurings real estate loans | Commercial construction
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	0	0	0
Pre-modification outstanding recorded investment	$ 0	$ 0	$ 0
Post-modification outstanding recorded investment	0	0	0
Net increase in ALLL	$ 0	$ 0	$ 0
Troubled debt restructurings real estate loans | Residential construction
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	0	0	0
Pre-modification outstanding recorded investment	$ 0	$ 0	$ 0
Post-modification outstanding recorded investment	0	0	0
Net increase in ALLL	$ 0	$ 0	$ 0
Troubled debt restructurings real estate loans | Commercial
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	13	9	15
Pre-modification outstanding recorded investment	$ 2,550,000	$ 889,000	$ 20,266,000
Post-modification outstanding recorded investment	2,550,000	889,000	20,266,000
Net increase in ALLL	$ 176,000	$ 248,000	$ 865,000
Troubled debt restructurings real estate loans | Consumer
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	0	1	0
Pre-modification outstanding recorded investment	$ 0	$ 59,000	$ 0
Post-modification outstanding recorded investment	0	59,000	0
Net increase in ALLL	$ 0	$ 27,000	$ 0
Troubled debt restructurings that subsequently defaulted
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	2	1	2
Recorded investment	$ 327,000	$ 222,000	$ 263,000
Consumer mortgage loans collateralized by residential real estate property in foreclosure process	$ 4,200,000	$ 4,300,000
Troubled debt restructurings that subsequently defaulted | Residential 1-4 family
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	0	1	1
Recorded investment	$ 0	$ 222,000	$ 239,000
Troubled debt restructurings that subsequently defaulted | Commercial real estate
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	0	0	0
Recorded investment	$ 0	$ 0	$ 0
Troubled debt restructurings that subsequently defaulted | Home equity line of credit
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	1	0	0
Recorded investment	$ 81,000	$ 0	$ 0
Troubled debt restructurings that subsequently defaulted | Residential land
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	0	0	0
Recorded investment	$ 0	$ 0	$ 0
Troubled debt restructurings that subsequently defaulted | Commercial construction
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	0	0	0
Recorded investment	$ 0	$ 0	$ 0
Troubled debt restructurings that subsequently defaulted | Residential construction
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	0	0	0
Recorded investment	$ 0	$ 0	$ 0
Troubled debt restructurings that subsequently defaulted | Commercial
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	1	0	1
Recorded investment	$ 246,000	$ 0	$ 24,000
Troubled debt restructurings that subsequently defaulted | Consumer
Loan modifications determined to be troubled debt restructurings
Number of contracts | contract	0	0	0
Recorded investment	$ 0	$ 0	$ 0

Bank segment (HEI only) - Mortg

Bank segment (HEI only) - Mortgage Servicing Rights, Narrative (Details) - American Savings Bank (ASB) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans receivable
Repurchased mortgage loans	$ 0	$ 0	$ 0
Mortgage servicing fees	3,000,000	3,000,000	2,900,000
Residential loan
Loans receivable
Proceeds from sale of mortgage loans	112,200,000	128,000,000	236,100,000
Gain on sale of mortgage loans	$ 1,500,000	$ 2,200,000	$ 6,600,000

Bank segment (HEI only) - Mor_2

Bank segment (HEI only) - Mortgage Servicing Rights (Details) - American Savings Bank (ASB) - Allowance for mortgage-servicing assets – bank - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans receivable
Gross carrying amount	$ 18,556	$ 17,511
Accumulated amortization	(10,494)	(8,872)
Valuation allowance	0	0	$ 0	$ 0
Net carrying amount	$ 8,062	$ 8,639	$ 9,373

Bank segment (HEI only) - Mor_3

Bank segment (HEI only) - Mortgage Servicing Rights and Valuation Allowance Roll Forward (Details) - American Savings Bank (ASB) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Mortgage Servicing Rights [Roll Forward]
Beginning balance	$ 8,639
Ending balance	8,062	$ 8,639
Allowance for mortgage-servicing assets – bank
Mortgage Servicing Rights [Roll Forward]
Beginning balance	8,639	9,373	$ 8,884
Amount capitalized	1,045	1,239	2,740
Amortization	(1,622)	(1,973)	(2,251)
Sale of mortgage servicing rights	0	0	0
Other-than-temporary impairment	0	0	0
Ending balance	8,062	8,639	9,373
Valuation Allowance [Roll Forward]
Valuation allowance, beginning balance	0	0	0
Provision (recovery)	0	0	0
Other-than-temporary impairment	0	0	0
Valuation allowance, ending balance	0	0	0
Net carrying amount	8,062	$ 8,639	$ 9,373
Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract]
2,019	1,100
2,020	1,000
2,021	900
2,022	800
2,023	$ 700
Measurement Band A
Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract]
Risks inherent in servicing assets and servicing liabilities band percent for risk categorization	0.50%
Measurement Band B
Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract]
Risks inherent in servicing assets and servicing liabilities band percent for risk categorization	1.00%

Bank segment (HEI only) - Key A

Bank segment (HEI only) - Key Assumptions Used in Estimating the Fair Value of ASB's Mortgage Servicing Rights (Details) - Allowance for mortgage-servicing assets – bank $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Prepayment rate:
25 basis points adverse rate change	$ (250)	$ (869)
50 basis points adverse rate change	(566)	(1,828)
Discount rate:
25 basis points adverse rate change	(139)	(111)
50 basis points adverse rate change	(275)	(220)
American Savings Bank (ASB)
Mortgage Servicing Rights
Unpaid principal balance	$ 1,188,514	$ 1,195,454
Weighted average note rate	3.98%	3.94%
American Savings Bank (ASB) | Discount rate
Mortgage Servicing Rights
Weighted average measurement input	0.100	0.100
American Savings Bank (ASB) | Prepayment speed
Mortgage Servicing Rights
Weighted average measurement input	0.065	0.090

Bank segment (HEI only) - Depos

Bank segment (HEI only) - Deposit Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted-average stated rate
Savings	0.07%	0.07%
Checking, interest-bearing	0.09%	0.03%
Checking, Noninterest-bearing	0.00%	0.00%
Commercial checking	0.00%	0.00%
Money market	0.63%	0.09%
Time certificates	1.61%	1.26%
Total weighted-average stated rate	0.27%	0.20%
Deposit liabilities
Savings	$ 2,322,552	$ 2,303,450
Checking
Interest-bearing	1,055,019	944,833
Noninterest-bearing	932,608	896,292
Commercial checking	868,119	863,941
Money market	152,713	114,797
Time certificates	827,841	767,284
Total Amount	6,158,852	5,890,597
Certificate accounts of $100,000 or more	500,200	433,400
Term certificates outstanding, scheduled maturities
2,019	508,833
2,020	128,613
2,021	107,095
2,022	49,329
2,023	30,456
Thereafter	3,515
Total	827,841
Overdrawn deposit accounts classified as loans	2,100	1,700
Interest expense on deposit liabilities by type of deposit
Time certificates	11,044	7,687	$ 5,390
Savings	1,639	1,567	1,402
Money market	602	168	202
Interest-bearing checking	706	238	173
Interest expense on deposit liabilities	$ 13,991	$ 9,660	$ 7,167

Bank segment (HEI only) - Secur

Bank segment (HEI only) - Securities Sold Under Agreements to Repurchase, Including Related Collateral Received From or Pledged to Counterparties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Securities sold under agreements to repurchase
Gross amount of recognized liabilities	$ 65,000	$ 141,000
Gross amount offset in the Balance Sheets	0	0
Net amount of liabilities presented in the Balance Sheets	$ 65,000	141,000
Fair value of collateral, percent of fair value	5.00%
Repurchase liability	$ 65,040	$ 140,859
Weighted-average interest rate as of end of the period	0.75%	0.65%
Identical securities
Securities sold under agreements to repurchase
Repurchase liability	$ 65,000	$ 141,000	$ 93,000
Average amount outstanding during the year	99,000	98,000	170,000
Maximum amount outstanding as of any month-end	$ 152,000	$ 141,000	$ 229,000
Weighted-average interest rate as of end of the period	0.75%	0.65%	0.23%
Weighted-average interest rate during the year	0.71%	0.26%	1.43%
Weighted-average remaining days to maturity as of end of the period	1 day	1 day	6 days
Commercial account holders
Securities sold under agreements to repurchase
Net amount of liabilities presented in the Balance Sheets	$ 65,000	$ 141,000
Financial instruments	92,000	165,000
Cash collateral pledged	$ 0	$ 0

Bank segment (HEI only) - Sec_2

Bank segment (HEI only) - Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Securities sold under agreements to repurchase
Repurchase liability	$ 65,040	$ 140,859
Weighted-average interest rate	0.75%	0.65%
Collateralized by mortgage-related securities and federal agency obligations
Securities sold under agreements to repurchase
Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest	$ 92,290	$ 165,464
Overnight
Securities sold under agreements to repurchase
Repurchase liability	$ 65,040	$ 140,859
Weighted-average interest rate	0.75%	0.65%
Overnight | Collateralized by mortgage-related securities and federal agency obligations
Securities sold under agreements to repurchase
Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest	$ 92,290	$ 165,464
1 to 29 days
Securities sold under agreements to repurchase
Repurchase liability	$ 0	$ 0
Weighted-average interest rate	0.00%	0.00%
1 to 29 days | Collateralized by mortgage-related securities and federal agency obligations
Securities sold under agreements to repurchase
Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest	$ 0	$ 0
30 to 90 days
Securities sold under agreements to repurchase
Repurchase liability	$ 0	$ 0
Weighted-average interest rate	0.00%	0.00%
30 to 90 days | Collateralized by mortgage-related securities and federal agency obligations
Securities sold under agreements to repurchase
Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest	$ 0	$ 0
Over 90 days
Securities sold under agreements to repurchase
Repurchase liability	$ 0	$ 0
Weighted-average interest rate	0.00%	0.00%
Over 90 days | Collateralized by mortgage-related securities and federal agency obligations
Securities sold under agreements to repurchase
Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest	$ 0	$ 0

Bank segment (HEI only) - FHLB

Bank segment (HEI only) - FHLB Advances (Details) $ in Thousands	Dec. 31, 2018USD ($)
Weighted-average stated rate
2,019	2.63%
2,020	0.00%
2,021	0.00%
2,022	0.00%
2,023	0.00%
Thereafter	0.00%
Total weighted-average stated rate	2.63%
Due in
2,019	$ 45,000
2,020	0
2,021	0
2,022	0
2,023	0
Thereafter	0
Total amount due	$ 45,000

Bank segment (HEI only) - Addit

Bank segment (HEI only) - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 1988
Hawaiian Electric Industries, Inc.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends paid	$ 154	$ 125	$ 130
Hawaiian Electric Industries, Inc. | Consolidated subsidiary | American Savings Bank (ASB) | Management and administrative services
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Revenue from related party	2.2	2.1	$ 2.3
Hawaiian Electric Industries, Inc. | Maximum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Obligation to contribute additional capital under the Capital Maintenance Agreement				$ 65.1
Reduction in obligation to contribute additional capital under the Capital Maintenance Agreement	28.3
American Savings Bank (ASB)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Borrowing capacity	2,000	1,800
Cash dividends paid	$ 50	$ 37.5

Bank segment (HEI only) - Capit

Bank segment (HEI only) - Capital And Ratio (Details) - American Savings Bank (ASB) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage, actual capital	$ 606,291	$ 571,810
Tier 1 leverage, actual ratio	8.70%	8.58%
Tier 1 leverage, required capital	$ 278,811	$ 266,430
Tier 1 leverage, required ratio	4.00%	4.00%
Tier 1 leverage, required to be well capitalized capital	$ 348,514	$ 333,038
Tier 1 leverage, required to be well capitalized ratio	5.00%	5.00%
Common equity tier 1, actual capital	$ 606,291	$ 571,810
Common equity tier 1, actual ratio	12.80%	12.95%
Common equity tier 1, required capital	$ 213,190	$ 198,628
Common equity tier 1, required ratio	4.50%	4.50%
Common equity tier 1, required to be well capitalized, Capital	$ 307,941	$ 286,907
Common equity tier 1, required to be well capitalized, Ratio	6.50%	6.50%
Tier 1 capital, actual capital	$ 606,291	$ 571,810
Tier 1 capital, actual ratio	12.80%	12.95%
Tier 1 capital, required capital	$ 284,253	$ 264,838
Tier 1 capital, required ratio	6.00%	6.00%
Tier 1 capital, Required to be well capitalized, Capital	$ 379,004	$ 353,117
Tier 1 capital, Required to be well capitalized, Ratio	8.00%	8.00%
Total capital, Actual capital	$ 660,151	$ 626,987
Total capital, Actual ratio	13.93%	14.20%
Total capital, Required capital	$ 379,004	$ 353,117
Total capital, Required ratio	8.00%	8.00%
Total capital, Required to be well capitalized, Capital	$ 473,755	$ 441,396
Total capital, Required to be well capitalized, Ratio	10.00%	10.00%

Bank segment (HEI only) - Deriv

Bank segment (HEI only) - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative instrument
Net gains (losses) recognized in the Statement of Income	$ (59)	$ (137)	$ (111)
Not Designated as Hedging Instrument
Derivative instrument
Asset derivative	91	137
Liability derivative	43	30
Interest Rate Lock Commitments
Derivative instrument
Notional amount	10,180	13,669
Fair value	91	131
Interest Rate Lock Commitments | Not Designated as Hedging Instrument
Derivative instrument
Asset derivative	91	133
Liability derivative	0	2
Interest Rate Lock Commitments | Not Designated as Hedging Instrument | Mortgage banking income
Derivative instrument
Net gains (losses) recognized in the Statement of Income	(40)	(290)	37
Forward commitments
Derivative instrument
Notional amount	10,132	14,465
Fair value	(43)	(24)
Forward commitments | Not Designated as Hedging Instrument
Derivative instrument
Asset derivative	0	4
Liability derivative	43	28
Forward commitments | Not Designated as Hedging Instrument | Mortgage banking income
Derivative instrument
Net gains (losses) recognized in the Statement of Income	$ (19)	$ 153	$ (148)

Bank segment (HEI only) - Off B

Bank segment (HEI only) - Off Balance Sheet Arrangements and Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Minimum
Guarantees
Prepaid assessment rate for financial institutions in low risk category	0.025%
Prepaid assessment rate for financial institutions in high risk category	0.30%
Maximum
Guarantees
Prepaid assessment rate for financial institutions in low risk category	0.09%
Prepaid assessment rate for financial institutions in high risk category	0.45%
American Savings Bank (ASB)
Guarantees
FDIC insurance assessment	$ 2,500	$ 2,600	$ 3,200
American Savings Bank (ASB) | Indemnification Agreement
Guarantees
Accrued indemnification litigation obligation	1,100
Reserve for Off-balance Sheet Activities
Guarantees
Unused Commitments to Extend Credit	1,859,046	1,780,437
Home equity line of credit
Guarantees
Unused Commitments to Extend Credit	1,242,804	1,214,103
Commercial and commercial real estate
Guarantees
Unused Commitments to Extend Credit	515,058	466,510
Consumer
Guarantees
Unused Commitments to Extend Credit	70,292	68,053
Residential 1-4 family
Guarantees
Unused Commitments to Extend Credit	17,552	18,635
Commercial and financial standby letters of credit
Guarantees
Unused Commitments to Extend Credit	$ 13,340	$ 13,136

Short-term borrowings (Details)

Short-term borrowings (Details)	Jan. 31, 2019USD ($)	Nov. 29, 2018USD ($)	Dec. 31, 2018USD ($)instrumentInstitution	Oct. 04, 2018USD ($)	Dec. 31, 2017USD ($)
Short-term borrowings
Outstanding amount			$ 73,992,000		$ 117,945,000
Credit agreements
Number of financial institutions | Institution			8
Maximum
Credit agreements
Capitalization ratio required to be maintained as per the debt covenant			50.00%
Line of credit facility
Short-term borrowings
Maximum capacity under syndicated credit facilities			$ 150,000,000
Credit agreements
Line of credit facility basis point spread			1.375%
Annual fees on undrawn commitments, basis points (as a percent)			0.20%
Line of credit facility | Hamakua Energy Partners, L.P. (HEP)
Short-term borrowings
Maximum capacity under syndicated credit facilities			$ 6,700,000
Number of letters of credit entered into during the period | instrument			3
Unsecured Debt
Short-term borrowings
Debt instrument, face amount				$ 150,000,000
Commercial paper
Short-term borrowings
Outstanding amount			$ 49,000,000		63,000,000
Weighted-average interest rate			2.90%
Hawaiian Electric Company, Inc. and Subsidiaries | Line of credit facility
Short-term borrowings
Long-term line of credit			$ 0		0
Hawaiian Electric
Credit agreements
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant			65.00%
Ratio of consolidated capitalization required to be maintained as per the debt covenant			35.00%
Hawaiian Electric | Line of credit facility
Short-term borrowings
Outstanding amount					0
Maximum capacity under syndicated credit facilities			$ 200,000,000
Long-term line of credit			$ 0		0
Credit agreements
Line of credit facility basis point spread			1.375%
Annual fees on undrawn commitments, basis points (as a percent)			0.20%
Hawaiian Electric | Unsecured Debt | Term Loan Credit Agreement Maturing November 2019
Short-term borrowings
Debt instrument term		364 days
Debt instrument, face amount		$ 50,000,000
Proceeds from issuance of debt		$ 25,000,000
Hawaiian Electric | Unsecured Debt | Term Loan Credit Agreement Maturing November 2019 | Subsequent Event
Short-term borrowings
Proceeds from issuance of debt	$ 25,000,000
Hawaiian Electric | Commercial paper
Short-term borrowings
Outstanding amount			$ 0		$ 5,000,000

Long-term debt (Details)

Long-term debt (Details) - USD ($)	1 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Oct. 04, 2018	May 30, 2018	Dec. 31, 2017
Long-term debt
Less unamortized debt issuance costs	$ (2,599,000)				$ (2,007,000)
Long-term debt, net—other than bank	1,879,641,000				1,683,797,000
Aggregate principal payments
2,019	4,000,000
2,020	100,000,000
2,021	54,000,000
2,022	206,000,000
2,023	154,000,000
Contribution to maintain targeted equity capitalization structure	71,000,000
Electric utility
Aggregate principal payments
2,019	0
2,020	96,000,000
2,021	0
2,022	52,000,000
2,023	100,000,000
Hawaiian Electric Company, Inc. and Subsidiaries
Long-term debt
Gross long-term debt	1,426,546,000				1,376,546,000
Unsecured Debt
Aggregate principal payments
Debt instrument, face amount			$ 150,000,000
Unsecured Debt | Mauo, LLC
Long-term debt
Gross long-term debt	0
Aggregate principal payments
Debt instrument, face amount		$ 50,500,000
Unsecured Debt | Mauo, LLC | LIBOR
Aggregate principal payments
Line of credit facility basis point spread		1.375%
Special purpose revenue bonds issued on behalf of electric utility subsidiaries
Long-term debt
Gross long-term debt	1,418,802,000				1,368,479,000
Hamakua Energy 4.02% notes, due 2030 | Senior notes
Long-term debt
Gross long-term debt	$ 63,438,000				67,325,000
Debt instrument, stated interest rate	4.02%
HEI 2.99% term loan, due 2022 | Senior notes
Long-term debt
Gross long-term debt	$ 150,000,000				150,000,000
HEI 2.99% term loan, due 2022 | Term loan
Long-term debt
Debt instrument, stated interest rate	2.99%
HEI 5.67% senior notes, due 2021 | Senior notes
Long-term debt
Gross long-term debt	$ 50,000,000				50,000,000
Debt instrument, stated interest rate	5.67%
HEI 3.99% senior notes, due 2023 | Senior notes
Long-term debt
Gross long-term debt	$ 50,000,000				50,000,000
Debt instrument, stated interest rate	3.99%
HEI 4.58% senior notes, due 2025 | Senior notes
Long-term debt
Debt instrument, stated interest rate	4.58%
HEI 4.58% senior notes, due 2025 | Term loan
Long-term debt
Gross long-term debt	$ 50,000,000				0
HEI 4.72% senior notes, due 2028 | Senior notes
Long-term debt
Debt instrument, stated interest rate	4.72%
HEI 4.72% senior notes, due 2028 | Term loan
Long-term debt
Gross long-term debt	$ 100,000,000				$ 0
HEI Series 2018A
Long-term debt
Debt instrument, stated interest rate			4.58%
Aggregate principal payments
Debt instrument, face amount			$ 50,000,000
HEI Series 2018A | Unsecured Debt
Long-term debt
Gross long-term debt				$ 67,500,000
Debt instrument, stated interest rate				4.38%
HEI Series 2018A | Unsecured Debt | Hawaiian Electric Company, Inc. and Subsidiaries
Long-term debt
Gross long-term debt				$ 52,000,000
HEI Series 2018A | Unsecured Debt | HELCO
Long-term debt
Gross long-term debt				9,000,000
HEI Series 2018A | Unsecured Debt | MECO
Long-term debt
Gross long-term debt				6,500,000
HEI Series 2018B
Long-term debt
Debt instrument, stated interest rate			4.72%
Aggregate principal payments
Debt instrument, face amount			$ 100,000,000
HEI Series 2018B | Unsecured Debt
Long-term debt
Gross long-term debt				$ 17,500,000
Debt instrument, stated interest rate				4.53%
HEI Series 2018B | Unsecured Debt | Hawaiian Electric Company, Inc. and Subsidiaries
Long-term debt
Gross long-term debt				$ 12,500,000
HEI Series 2018B | Unsecured Debt | HELCO
Long-term debt
Gross long-term debt				3,000,000
HEI Series 2018B | Unsecured Debt | MECO
Long-term debt
Gross long-term debt				2,000,000
Series 2018C | Unsecured Debt
Long-term debt
Gross long-term debt				$ 15,000,000
Debt instrument, stated interest rate				4.72%
Series 2018C | Unsecured Debt | Hawaiian Electric Company, Inc. and Subsidiaries
Long-term debt
Gross long-term debt				$ 10,500,000
Series 2018C | Unsecured Debt | HELCO
Long-term debt
Gross long-term debt				3,000,000
Series 2018C | Unsecured Debt | MECO
Long-term debt
Gross long-term debt				$ 1,500,000

Shareholders' equity - Addition

Shareholders' equity - Additional Information (Details)	Dec. 31, 2018shares
Equity [Abstract]
Common stock reserved for future issuance (in shares)	10,029,398

Shareholders' equity - Accumula

Shareholders' equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Attributable to Parent [Roll Forward]
Beginning Balance	$ 2,097,386	$ 2,066,753	$ 1,927,640
Other comprehensive income (loss), net of taxes	(8,669)	(1,372)	(6,867)
Reclass of AOCI for tax rate reduction impact		0
Ending Balance	2,162,280	2,097,386	2,066,753
Hawaiian Electric Company, Inc. and Subsidiaries
AOCI Attributable to Parent [Roll Forward]
Beginning Balance	1,845,283	1,799,787	1,728,325
Other comprehensive income (loss), net of taxes	1,318	(688)	(1,247)
Ending Balance	1,957,641	1,845,283	1,799,787
AOCI
AOCI Attributable to Parent [Roll Forward]
Beginning Balance	(41,941)	(33,129)	(26,262)
Other comprehensive income (loss), net of taxes	(8,669)	(1,372)	(6,867)
Reclass of AOCI for tax rate reduction impact		(7,440)
Ending Balance	(50,610)	(41,941)	(33,129)
AOCI | Hawaiian Electric Company, Inc. and Subsidiaries
AOCI Attributable to Parent [Roll Forward]
Beginning Balance	(1,219)	(322)	925
Other comprehensive income (loss), net of taxes	1,318	(688)	(1,247)
Reclass of AOCI for tax rate reduction impact		(209)
Ending Balance	99	(1,219)	(322)
Net unrealized gains (losses) on securities
AOCI Attributable to Parent [Roll Forward]
Beginning Balance	(14,951)	(7,931)	(1,872)
Other comprehensive income (loss), net of taxes	(9,472)	(4,370)	(6,059)
Reclass of AOCI for tax rate reduction impact		(2,650)
Ending Balance	(24,423)	(14,951)	(7,931)
Unrealized gains (losses) on derivatives
AOCI Attributable to Parent [Roll Forward]
Beginning Balance	0	(454)	(54)
Other comprehensive income (loss), net of taxes	(436)	454	(400)
Reclass of AOCI for tax rate reduction impact		0
Ending Balance	(436)	0	(454)
Unrealized gains (losses) on derivatives | Hawaiian Electric Company, Inc. and Subsidiaries
AOCI Attributable to Parent [Roll Forward]
Beginning Balance	0	(454)	0
Other comprehensive income (loss), net of taxes	0	454	(454)
Reclass of AOCI for tax rate reduction impact		0
Ending Balance	0	0	(454)
Retirement benefit plans
AOCI Attributable to Parent [Roll Forward]
Beginning Balance	(26,990)	(24,744)	(24,336)
Other comprehensive income (loss), net of taxes	1,239	2,544	(408)
Reclass of AOCI for tax rate reduction impact		(4,790)
Ending Balance	(25,751)	(26,990)	(24,744)
Retirement benefit plans | Hawaiian Electric Company, Inc. and Subsidiaries
AOCI Attributable to Parent [Roll Forward]
Beginning Balance	(1,219)	132	925
Other comprehensive income (loss), net of taxes	1,318	(1,142)	(793)
Reclass of AOCI for tax rate reduction impact		(209)
Ending Balance	$ 99	$ (1,219)	$ 132

Shareholders' equity - Reclassi

Shareholders' equity - Reclassification Out Of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Revenues	$ 761,650	$ 768,048	$ 685,277	$ 645,874	$ 658,597	$ 673,185	$ 632,281	$ 591,562	$ 2,860,849	$ 2,555,625	$ 2,380,654
Total reclassifications									29,340	(62,533)	42,623
Hawaiian Electric Company, Inc. and Subsidiaries
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Revenues	$ 680,563	$ 687,409	$ 608,126	$ 570,427	$ 583,311	$ 598,769	$ 556,875	$ 518,611	2,546,525	2,257,566
Total reclassifications									27,337	(63,793)	41,665
Bank
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Revenues									314,275	297,640	285,924
Electric utility
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Revenues									2,546,525	2,257,566	2,094,368
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications									21,015	15,737	14,518
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent | Hawaiian Electric Company, Inc. and Subsidiaries
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications									19,012	14,477	13,254
Accumulated Defined Benefit Plans Adjustment, Impact Of Decision And Orders Of The Public Utility Commission Included In Regulatory Assets
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications									8,325	(78,724)	28,584
Accumulated Defined Benefit Plans Adjustment, Impact Of Decision And Orders Of The Public Utility Commission Included In Regulatory Assets | Hawaiian Electric Company, Inc. and Subsidiaries
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications									8,325	(78,724)	28,584
Amount reclassified from AOCI | Net unrealized gains (losses) on securities | Bank
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Revenues									0	0	360
Amount reclassified from AOCI | Unrealized gains (losses) on derivatives | Window forward contracts | Hawaiian Electric Company, Inc. and Subsidiaries
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications									0	454	(173)
Amount reclassified from AOCI | Unrealized gains (losses) on derivatives | Interest rate contracts
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications									0	0	54
Amount reclassified from AOCI | Unrealized gains (losses) on derivatives | Electric utility | Window forward contracts
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications									$ 0	$ 454	$ (173)

Revenues (Details)

Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from Contract with Customer [Abstract]
General payment period									30 days
Disaggregation of Revenue [Line Items]
Revenues									$ 2,614,831		$ 2,380,654
Revenues	$ 761,650	$ 768,048	$ 685,277	$ 645,874	$ 658,597	$ 673,185	$ 632,281	$ 591,562	2,860,849	$ 2,555,625	2,380,654
Services/goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues									47,300
Services/goods transferred over time
Disaggregation of Revenue [Line Items]
Revenues									2,567,531
Electric energy sales - residential
Disaggregation of Revenue [Line Items]
Revenues									801,846
Electric energy sales - commercial
Disaggregation of Revenue [Line Items]
Revenues									853,672
Electric energy sales - large light and power
Disaggregation of Revenue [Line Items]
Revenues									894,770
Electric energy sales - other
Disaggregation of Revenue [Line Items]
Revenues									17,243
Bank fees
Disaggregation of Revenue [Line Items]
Revenues									47,300
Total revenues from other sources
Disaggregation of Revenue [Line Items]
Revenues									246,018
Regulatory revenue
Disaggregation of Revenue [Line Items]
Revenues									(37,687)
Bank interest and dividend income
Disaggregation of Revenue [Line Items]
Revenues									258,225
Other bank noninterest income
Disaggregation of Revenue [Line Items]
Revenues									8,750
Other
Disaggregation of Revenue [Line Items]
Revenues									16,730
Hawaiian Electric Company, Inc. and Subsidiaries
Disaggregation of Revenue [Line Items]
Revenue taxes, other than income tax expense									226,000	202,000	187,000
Revenue taxes accrued	$ 130,000				$ 115,000				130,000	115,000
Electric utility
Disaggregation of Revenue [Line Items]
Revenues									2,567,531		2,094,368
Revenues									2,546,525	2,257,566	2,094,368
Electric utility | Services/goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues									0
Electric utility | Services/goods transferred over time
Disaggregation of Revenue [Line Items]
Revenues									2,567,531
Electric utility | Electric energy sales - residential
Disaggregation of Revenue [Line Items]
Revenues									801,846
Electric utility | Electric energy sales - commercial
Disaggregation of Revenue [Line Items]
Revenues									853,672
Electric utility | Electric energy sales - large light and power
Disaggregation of Revenue [Line Items]
Revenues									894,770
Electric utility | Electric energy sales - other
Disaggregation of Revenue [Line Items]
Revenues									17,243
Electric utility | Bank fees
Disaggregation of Revenue [Line Items]
Revenues									0
Electric utility | Total revenues from other sources
Disaggregation of Revenue [Line Items]
Revenues									(21,006)
Electric utility | Regulatory revenue
Disaggregation of Revenue [Line Items]
Revenues									(37,687)
Electric utility | Bank interest and dividend income
Disaggregation of Revenue [Line Items]
Revenues									0
Electric utility | Other bank noninterest income
Disaggregation of Revenue [Line Items]
Revenues									0
Electric utility | Other
Disaggregation of Revenue [Line Items]
Revenues									16,681
Bank
Disaggregation of Revenue [Line Items]
Revenues									47,300		285,924
Revenues									314,275	297,640	285,924
Bank | Services/goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues									47,300
Bank | Services/goods transferred over time
Disaggregation of Revenue [Line Items]
Revenues									0
Bank | Electric energy sales - residential
Disaggregation of Revenue [Line Items]
Revenues									0
Bank | Electric energy sales - commercial
Disaggregation of Revenue [Line Items]
Revenues									0
Bank | Electric energy sales - large light and power
Disaggregation of Revenue [Line Items]
Revenues									0
Bank | Electric energy sales - other
Disaggregation of Revenue [Line Items]
Revenues									0
Bank | Bank fees
Disaggregation of Revenue [Line Items]
Revenues									47,300
Bank | Total revenues from other sources
Disaggregation of Revenue [Line Items]
Revenues									266,975
Bank | Regulatory revenue
Disaggregation of Revenue [Line Items]
Revenues									0
Bank | Bank interest and dividend income
Disaggregation of Revenue [Line Items]
Revenues									258,225
Bank | Other bank noninterest income
Disaggregation of Revenue [Line Items]
Revenues									8,750
Bank | Other
Disaggregation of Revenue [Line Items]
Revenues									0
Other
Disaggregation of Revenue [Line Items]
Revenues									0		362
Revenues									49	$ 419	$ 362
Other | Services/goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues									0
Other | Services/goods transferred over time
Disaggregation of Revenue [Line Items]
Revenues									0
Other | Electric energy sales - residential
Disaggregation of Revenue [Line Items]
Revenues									0
Other | Electric energy sales - commercial
Disaggregation of Revenue [Line Items]
Revenues									0
Other | Electric energy sales - large light and power
Disaggregation of Revenue [Line Items]
Revenues									0
Other | Electric energy sales - other
Disaggregation of Revenue [Line Items]
Revenues									0
Other | Bank fees
Disaggregation of Revenue [Line Items]
Revenues									0
Other | Total revenues from other sources
Disaggregation of Revenue [Line Items]
Revenues									49
Other | Regulatory revenue
Disaggregation of Revenue [Line Items]
Revenues									0
Other | Bank interest and dividend income
Disaggregation of Revenue [Line Items]
Revenues									0
Other | Other bank noninterest income
Disaggregation of Revenue [Line Items]
Revenues									0
Other | Other
Disaggregation of Revenue [Line Items]
Revenues									$ 49

Retirement benefits - Additiona

Retirement benefits - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Vested percentage of interest of each affected participant after participating employer terminates participation	100.00%
Number of years for which regulatory asset/liability for each utility will be amortized, beginning with respective utility's next rate case	5 years
Executive life and nonqualified pension plan expenses	$ 1,000,000	$ 1,100,000
Regulatory asset charges pretax	$ 11,200,000	(128,000,000)
Fair value of plan assets, valuation difference amortized in first year	0.00%
Fair value of plan assets, valuation difference amortized in two to five years	25.00%
Number of past years for adding or subtracting the unamortized differences from fair value	4 years
Percentage of range around fair value	15.00%
Expected cash funding for qualified defined benefit plans
Defined contribution plan, expenses recognized	$ 7,000,000	7,000,000	$ 5,000,000
Cash contributions by the employer to defined contribution plan	7,000,000	6,000,000	5,000,000
Hawaiian Electric Company, Inc. and Subsidiaries
Expected cash funding for qualified defined benefit plans
Defined contribution plan, expenses recognized	$ 2,300,000	2,000,000	1,500,000
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on plan assets	7.25%
Discount rate	4.51%
Assumed discount rate, active manager premium	0.20%
Pension expense	$ 59,000,000	33,000,000	33,000,000
Defined benefit pension plans with accumulated benefit obligations in excess of plan assets
Defined benefit plans - ABOs	1,700,000,000	1,800,000,000
Aggregate accumulated benefit obligations	1,600,000,000	1,700,000,000
Plan assets	1,400,000,000	1,500,000,000
Defined benefit plans with benefit obligations in excess of plan assets
PBOs	1,900,000,000	2,000,000,000
Plan assets	1,400,000,000	1,500,000,000
Expected cash funding for qualified defined benefit plans
Estimate of contributions to postretirement benefit plans in 2018	$ 47,000,000
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Actual net return on plan assets	6.50%
Pension expense	$ 55,000,000	30,000,000	30,000,000
Defined benefit pension plans with accumulated benefit obligations in excess of plan assets
Defined benefit plans - ABOs	1,600,000,000	1,700,000,000
Aggregate accumulated benefit obligations	1,600,000,000	1,700,000,000
Plan assets	1,300,000,000	1,500,000,000
Defined benefit plans with benefit obligations in excess of plan assets
PBOs	1,800,000,000	1,900,000,000
Plan assets	1,300,000,000	$ 1,500,000,000
Expected cash funding for qualified defined benefit plans
Estimate of contributions to postretirement benefit plans in 2018	$ 47,000,000
Other benefits
Defined Benefit Plan Disclosure [Line Items]
Assumed health care trend rate for medical in next fiscal year	7.25%	7.50%
Assumed health care trend rate for grading down plan in 12 fiscal years thereafter	5.00%
Assumed health care trend rate for dental in next fiscal year	5.00%	5.00%
Assumed health care trend rate for vision in next fiscal year	4.00%	4.00%
Assumed health care trend rate for grading down in 2028 and thereafter		5.00%
Postretirement benefits other than pension expense	$ 0	$ 1,000,000	1,000,000
Effect of one-percentage-point increase in assumed health care cost trend rates that would have increased total service and interest cost	100,000
Effect of one-percentage-point increase in assumed health care cost trend rates that would have increased the accumulated postretirement benefit obligation (APBO)	2,900,000
Effect of one-percentage-point decrease that would have reduced total service and interest cost	100,000
Effect of one-percentage-point decrease that would have reduced APBO	3,300,000
Expected cash funding for qualified defined benefit plans
Estimate of contributions to postretirement benefit plans in 2018	0
2,019	88,000,000
2,020	91,000,000
2,021	95,000,000
2,022	99,000,000
2,023	103,000,000
2024 through 2028	574,000,000
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Postretirement benefits other than pension expense	(100,000)	$ 800,000	$ 700,000
Effect of one-percentage-point increase in assumed health care cost trend rates that would have increased total service and interest cost	100,000
Effect of one-percentage-point increase in assumed health care cost trend rates that would have increased the accumulated postretirement benefit obligation (APBO)	2,800,000
Effect of one-percentage-point decrease that would have reduced total service and interest cost	100,000
Effect of one-percentage-point decrease that would have reduced APBO	3,200,000
Expected cash funding for qualified defined benefit plans
Estimate of contributions to postretirement benefit plans in 2018	0
2,019	81,000,000
2,020	83,000,000
2,021	87,000,000
2,022	90,000,000
2,023	93,000,000
2024 through 2028	$ 525,000,000
Minimum
Defined Benefit Plan Disclosure [Line Items]
Threshold percentage around fair value	85.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Threshold percentage around fair value	115.00%

Retirement benefits - Changes i

Retirement benefits - Changes in Projected Benefit Obligations and Fair Value of Plan Assets and Amounts Recognized in OCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Hawaiian Electric Company, Inc. and Subsidiaries
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined benefit pension and other postretirement benefit plans liability				$ (503,659)	$ (472,948)
Pension benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, balance at the beginning of the period	$ 2,094,356	$ 1,935,494
Service cost	68,987	64,906	$ 60,555
Interest cost	77,374	81,185	81,549
Actuarial losses (gains)	(171,226)	87,399
Participants contributions	0	0
Benefits paid and expenses	(78,107)	(74,628)
Benefit obligation, balance at the end of the period	1,991,384	2,094,356	1,935,494
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, balance at the beginning of the period	1,618,703	1,369,701
Actual return on plan assets	(101,406)	255,324
Employer contributions	38,496	66,983
Participants contributions	0	0
Benefits paid and expenses	(76,726)	(73,305)
Fair value of plan assets, balance at the end of the period	1,479,067	1,618,703	1,369,701
Accrued benefit asset (liability), balance				(512,317)	(475,653)
Other assets				10,930	15,443
Defined benefit pension and other postretirement benefit plans liability				(523,247)	(491,096)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income [Roll Forward]
AOCI debit/(credit), balance at beginning of the period (excluding impact of PUC D&Os)	527,830	619,451
Recognized during year – prior service credit	42	55
Recognized during year – net actuarial losses	(30,084)	(26,496)
Occurring during year – net actuarial losses (gains)	39,132	(65,180)
AOCI debit/(credit), balance at end of the period (excluding impact of PUC D&Os)	536,920	527,830	619,451
Cumulative impact of PUC D&Os				(498,944)	(489,894)
AOCI debit/(credit), balance at end of the period				37,976	37,936
Net actuarial loss				536,954	527,907
Prior service gain				(34)	(77)
AOCI debit/(credit), balance at end of the period (excluding impact of PUC D&Os)	527,830	619,451	619,451	536,920	527,830
Income taxes (benefits)				(10,023)	(9,986)
AOCI debit/(credit), net of taxes (benefits) balance at the end of the period				27,953	27,950
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, balance at the beginning of the period	1,928,648	1,779,626
Service cost	67,359	63,059	58,796
Interest cost	71,294	74,632	74,808
Actuarial losses (gains)	(158,258)	80,186
Participants contributions	0	0
Benefits paid and expenses	(71,535)	(68,691)
Transfers	145	(164)
Benefit obligation, balance at the end of the period	1,837,653	1,928,648	1,779,626
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, balance at the beginning of the period	1,468,403	1,233,184
Actual return on plan assets	(91,836)	237,830
Employer contributions	37,550	65,669
Participants contributions	0	0
Benefits paid and expenses	(71,060)	(68,225)
Other	56	(55)
Fair value of plan assets, balance at the end of the period	1,343,113	1,468,403	1,233,184
Accrued benefit asset (liability), balance				(494,540)	(460,245)
Other liabilities (short-term)				(512)	(494)
Defined benefit pension and other postretirement benefit plans liability				(494,028)	(459,751)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income [Roll Forward]
AOCI debit/(credit), balance at beginning of the period (excluding impact of PUC D&Os)	493,464	579,725
Recognized during year – prior service credit	(8)	(8)
Recognized during year – net actuarial losses	(27,302)	(24,392)
Occurring during year – net actuarial losses (gains)	36,035	(61,861)
AOCI debit/(credit), balance at end of the period (excluding impact of PUC D&Os)	502,189	493,464	579,725
Cumulative impact of PUC D&Os				(498,944)	(489,894)
AOCI debit/(credit), balance at end of the period				3,245	3,570
Net actuarial loss				502,173	493,439
Prior service gain				16	25
AOCI debit/(credit), balance at end of the period (excluding impact of PUC D&Os)	493,464	579,725	579,725	502,189	493,464
Income taxes (benefits)				(836)	(920)
AOCI debit/(credit), net of taxes (benefits) balance at the end of the period				2,409	2,650
Other benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, balance at the beginning of the period	212,601	233,835
Service cost	2,721	3,374	3,331
Interest cost	7,933	9,453	9,670
Actuarial losses (gains)	(25,977)	(25,557)
Participants contributions	2,505	2,078
Benefits paid and expenses	(11,117)	(10,582)
Benefit obligation, balance at the end of the period	188,666	212,601	233,835
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, balance at the beginning of the period	193,995	174,251
Actual return on plan assets	(11,846)	28,248
Employer contributions	0	0
Participants contributions	2,505	2,078
Benefits paid and expenses	(10,961)	(10,582)
Fair value of plan assets, balance at the end of the period	173,693	193,995	174,251
Accrued benefit asset (liability), balance				(14,973)	(18,606)
Other assets				0	0
Defined benefit pension and other postretirement benefit plans liability				(14,973)	(18,606)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income [Roll Forward]
AOCI debit/(credit), balance at beginning of the period (excluding impact of PUC D&Os)	1,474	42,290
Recognized during year – prior service credit	1,805	1,793
Recognized during year – net actuarial losses	(95)	(1,130)
Occurring during year – net actuarial losses (gains)	(1,222)	(41,479)
AOCI debit/(credit), balance at end of the period (excluding impact of PUC D&Os)	1,962	1,474	42,290
Cumulative impact of PUC D&Os				(4,929)	(2,767)
AOCI debit/(credit), balance at end of the period				(2,967)	(1,293)
Net actuarial loss				8,865	10,183
Prior service gain				(6,903)	(8,709)
AOCI debit/(credit), balance at end of the period (excluding impact of PUC D&Os)	1,474	42,290	42,290	1,962	1,474
Income taxes (benefits)				765	333
AOCI debit/(credit), net of taxes (benefits) balance at the end of the period				(2,202)	(960)
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, balance at the beginning of the period	204,644	225,723
Service cost	2,704	3,353	3,284
Interest cost	7,628	9,115	9,337
Actuarial losses (gains)	(25,330)	(25,172)
Participants contributions	2,472	2,047
Benefits paid and expenses	(10,958)	(10,419)
Transfers	2	(3)
Benefit obligation, balance at the end of the period	181,162	204,644	225,723
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, balance at the beginning of the period	190,814	171,383
Actual return on plan assets	(11,625)	27,806
Employer contributions	0	0
Participants contributions	2,472	2,047
Benefits paid and expenses	(10,801)	(10,419)
Other	2	(3)
Fair value of plan assets, balance at the end of the period	170,862	190,814	171,383
Accrued benefit asset (liability), balance				(10,300)	(13,830)
Other liabilities (short-term)				(669)	(633)
Defined benefit pension and other postretirement benefit plans liability				(9,631)	(13,197)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income [Roll Forward]
AOCI debit/(credit), balance at beginning of the period (excluding impact of PUC D&Os)	839	40,967
Recognized during year – prior service credit	1,803	1,804
Recognized during year – net actuarial losses	(98)	(1,102)
Occurring during year – net actuarial losses (gains)	(993)	(40,830)
AOCI debit/(credit), balance at end of the period (excluding impact of PUC D&Os)	1,551	839	40,967
Cumulative impact of PUC D&Os				(4,929)	(2,767)
AOCI debit/(credit), balance at end of the period				(3,378)	(1,928)
Net actuarial loss				8,439	9,531
Prior service gain				(6,888)	(8,692)
AOCI debit/(credit), balance at end of the period (excluding impact of PUC D&Os)	$ 839	$ 40,967	$ 40,967	1,551	839
Income taxes (benefits)				870	497
AOCI debit/(credit), net of taxes (benefits) balance at the end of the period				$ (2,508)	$ (1,431)

Retirement benefits - Weighted

Retirement benefits - Weighted Average Asset Allocation of Defined Benefit Retirement Plans and Weighted Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	100.00%	100.00%
Asset category, Target
Target	100.00%
Benefit obligation
Discount rate	4.31%	3.74%	4.26%
Rate of compensation increase	3.50%	3.50%	3.50%
Net periodic pension/benefit cost (years ended)
Discount rate	3.74%	4.26%	4.60%
Expected return on plan assets	7.50%	7.50%	7.75%
Rate of compensation increase	3.50%	3.50%	3.50%
Pension benefits | American Savings Bank (ASB)
Net periodic pension/benefit cost (years ended)
Expected return on plan assets	3.94%	4.46%	4.80%
Pension benefits | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	69.00%	73.00%
Asset category, Target
Target	70.00%
Pension benefits | Equity securities | Minimum
Asset category, Target
Target	65.00%
Pension benefits | Equity securities | Maximum
Asset category, Target
Target	75.00%
Pension benefits | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	31.00%	27.00%
Asset category, Target
Target	30.00%
Pension benefits | Fixed income securities | Minimum
Asset category, Target
Target	25.00%
Pension benefits | Fixed income securities | Maximum
Asset category, Target
Target	35.00%
Other benefits
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	100.00%	100.00%
Asset category, Target
Target	100.00%
Benefit obligation
Discount rate	4.34%	3.72%	4.22%
Net periodic pension/benefit cost (years ended)
Discount rate	3.72%	4.22%	4.57%
Expected return on plan assets	7.50%	7.50%	7.75%
Other benefits | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	70.00%	73.00%
Asset category, Target
Target	70.00%
Other benefits | Equity securities | Minimum
Asset category, Target
Target	65.00%
Other benefits | Equity securities | Maximum
Asset category, Target
Target	75.00%
Other benefits | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	30.00%	27.00%
Asset category, Target
Target	30.00%
Other benefits | Fixed income securities | Minimum
Asset category, Target
Target	25.00%
Other benefits | Fixed income securities | Maximum
Asset category, Target
Target	35.00%

Retirement benefits - Assets He

Retirement benefits - Assets Held In Retirement Benefit Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension benefits
Fair value measurements on a recurring basis
Fair value of plan assets	$ 1,479,067	$ 1,618,703	$ 1,369,701
Other benefits
Fair value measurements on a recurring basis
Fair value of plan assets	173,693	193,995	$ 174,251
Fair value measurements on a recurring basis | Pension benefits
Fair value measurements on a recurring basis
Fair value of plan assets	1,479,000	1,619,000
Fair value measurements on a recurring basis | Pension benefits | Total
Fair value measurements on a recurring basis
Fair value of plan assets	1,474,000	1,615,000
Fair value measurements on a recurring basis | Pension benefits | Equity Securities, Measured at Fair Value and Net Asset Value
Fair value measurements on a recurring basis
Fair value of plan assets	920,000	1,079,000
Fair value measurements on a recurring basis | Pension benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	507,000	568,000
Fair value measurements on a recurring basis | Pension benefits | Equity index and exchange-traded funds
Fair value measurements on a recurring basis
Fair value of plan assets	$ 348,000	$ 435,000
Fair value measurements on a recurring basis | Pension benefits | Non-U.S. Equity Funds
Fair value measurements on a recurring basis
Redemption frequency, daily	32.00%	32.00%
Redemption frequency, monthly	68.00%	68.00%
Fair value measurements on a recurring basis | Pension benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	$ 310,000	$ 297,000
Fair value measurements on a recurring basis | Pension benefits | Total fixed income investments
Fair value measurements on a recurring basis
Fair value of plan assets	518,000	500,000
Fair value measurements on a recurring basis | Pension benefits | Cash, receivables and payables, net
Fair value measurements on a recurring basis
Fair value of plan assets	5,000	4,000
Fair value measurements on a recurring basis | Other benefits
Fair value measurements on a recurring basis
Fair value of plan assets	174,000	194,000
Fair value measurements on a recurring basis | Other benefits | Total
Fair value measurements on a recurring basis
Fair value of plan assets	173,000	194,000
Fair value measurements on a recurring basis | Other benefits | Equity Securities, Measured at Fair Value and Net Asset Value
Fair value measurements on a recurring basis
Fair value of plan assets	117,000	139,000
Fair value measurements on a recurring basis | Other benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	65,000	75,000
Fair value measurements on a recurring basis | Other benefits | Equity index and exchange-traded funds
Fair value measurements on a recurring basis
Fair value of plan assets	$ 42,000	$ 52,000
Fair value measurements on a recurring basis | Other benefits | Non-U.S. Equity Funds
Fair value measurements on a recurring basis
Redemption frequency, daily	27.00%	26.00%
Redemption frequency, monthly	73.00%	74.00%
Fair value measurements on a recurring basis | Other benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	$ 47,000	$ 46,000
Fair value measurements on a recurring basis | Other benefits | Total fixed income investments
Fair value measurements on a recurring basis
Fair value of plan assets	51,000	50,000
Fair value measurements on a recurring basis | Other benefits | Cash, receivables and payables, net
Fair value measurements on a recurring basis
Fair value of plan assets	1,000	0
Fair value measurements on a recurring basis | Level 1 | Pension benefits | Total
Fair value measurements on a recurring basis
Fair value of plan assets	978,000	1,084,000
Fair value measurements on a recurring basis | Level 1 | Pension benefits | Equity Securities, Measured at Fair Value and Net Asset Value
Fair value measurements on a recurring basis
Fair value of plan assets	855,000	1,003,000
Fair value measurements on a recurring basis | Level 1 | Pension benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	507,000	568,000
Fair value measurements on a recurring basis | Level 1 | Pension benefits | Equity index and exchange-traded funds
Fair value measurements on a recurring basis
Fair value of plan assets	348,000	435,000
Fair value measurements on a recurring basis | Level 1 | Pension benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	123,000	81,000
Fair value measurements on a recurring basis | Level 1 | Pension benefits | Total fixed income investments
Fair value measurements on a recurring basis
Fair value of plan assets	123,000	81,000
Fair value measurements on a recurring basis | Level 1 | Other benefits | Total
Fair value measurements on a recurring basis
Fair value of plan assets	152,000	170,000
Fair value measurements on a recurring basis | Level 1 | Other benefits | Equity Securities, Measured at Fair Value and Net Asset Value
Fair value measurements on a recurring basis
Fair value of plan assets	107,000	127,000
Fair value measurements on a recurring basis | Level 1 | Other benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	65,000	75,000
Fair value measurements on a recurring basis | Level 1 | Other benefits | Equity index and exchange-traded funds
Fair value measurements on a recurring basis
Fair value of plan assets	42,000	52,000
Fair value measurements on a recurring basis | Level 1 | Other benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	45,000	43,000
Fair value measurements on a recurring basis | Level 1 | Other benefits | Total fixed income investments
Fair value measurements on a recurring basis
Fair value of plan assets	45,000	43,000
Fair value measurements on a recurring basis | Level 2 | Pension benefits | Total
Fair value measurements on a recurring basis
Fair value of plan assets	187,000	216,000
Fair value measurements on a recurring basis | Level 2 | Pension benefits | Equity Securities, Measured at Fair Value and Net Asset Value
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 2 | Pension benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 2 | Pension benefits | Equity index and exchange-traded funds
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 2 | Pension benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	187,000	216,000
Fair value measurements on a recurring basis | Level 2 | Pension benefits | Total fixed income investments
Fair value measurements on a recurring basis
Fair value of plan assets	187,000	216,000
Fair value measurements on a recurring basis | Level 2 | Other benefits | Total
Fair value measurements on a recurring basis
Fair value of plan assets	2,000	3,000
Fair value measurements on a recurring basis | Level 2 | Other benefits | Equity Securities, Measured at Fair Value and Net Asset Value
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 2 | Other benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 2 | Other benefits | Equity index and exchange-traded funds
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 2 | Other benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	2,000	3,000
Fair value measurements on a recurring basis | Level 2 | Other benefits | Total fixed income investments
Fair value measurements on a recurring basis
Fair value of plan assets	2,000	3,000
Fair value measurements on a recurring basis | Level 3 | Pension benefits | Total
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Pension benefits | Equity Securities, Measured at Fair Value and Net Asset Value
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Pension benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Pension benefits | Equity index and exchange-traded funds
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Pension benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Pension benefits | Total fixed income investments
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Other benefits | Total
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Other benefits | Equity Securities, Measured at Fair Value and Net Asset Value
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Other benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Other benefits | Equity index and exchange-traded funds
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Other benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Level 3 | Other benefits | Total fixed income investments
Fair value measurements on a recurring basis
Fair value of plan assets	0	0
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits
Fair value measurements on a recurring basis
Fair value of plan assets	309,000	315,000
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	65,000	76,000
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Non-U.S. Equity Funds
Fair value measurements on a recurring basis
Fair value of plan assets	$ 65,000	$ 76,000
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Non-U.S. Equity Funds | Minimum
Fair value measurements on a recurring basis
Redemption notice period (in days)	5 days	5 days
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Non-U.S. Equity Funds | Maximum
Fair value measurements on a recurring basis
Redemption notice period (in days)	30 days	30 days
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Total fixed income investments
Fair value measurements on a recurring basis
Fair value of plan assets	$ 208,000	$ 203,000
Redemption notice period (in days)	15 days	15 days
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents at NAV
Fair value measurements on a recurring basis
Fair value of plan assets	$ 36,000	$ 36,000
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents at NAV | Minimum
Fair value measurements on a recurring basis
Redemption notice period (in days)	0 days	0 days
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents at NAV | Maximum
Fair value measurements on a recurring basis
Redemption notice period (in days)	1 day	1 day
Fair value measurements on a recurring basis | Net Asset Value | Other benefits
Fair value measurements on a recurring basis
Fair value of plan assets	$ 19,000	$ 21,000
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	10,000	12,000
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Non-U.S. Equity Funds
Fair value measurements on a recurring basis
Fair value of plan assets	$ 10,000	$ 12,000
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Non-U.S. Equity Funds | Minimum
Fair value measurements on a recurring basis
Redemption notice period (in days)	5 days	5 days
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Non-U.S. Equity Funds | Maximum
Fair value measurements on a recurring basis
Redemption notice period (in days)	30 days	30 days
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Total fixed income investments
Fair value measurements on a recurring basis
Fair value of plan assets	$ 4,000	$ 4,000
Redemption notice period (in days)	15 days	10 days
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents at NAV
Fair value measurements on a recurring basis
Fair value of plan assets	$ 5,000	$ 5,000
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents at NAV | Minimum
Fair value measurements on a recurring basis
Redemption notice period (in days)	0 days	0 days
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents at NAV | Maximum
Fair value measurements on a recurring basis
Redemption notice period (in days)	1 day	1 day

Retirement benefits - Component

Retirement benefits - Components of NPBC (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension benefits
Defined benefit plans
Service cost	$ 68,987	$ 64,906	$ 60,555
Interest cost	77,374	81,185	81,549
Expected return on plan assets	(108,953)	(102,745)	(98,559)
Amortization of net prior service (gain) cost	(42)	(55)	(57)
Amortization of net actuarial losses	30,084	26,496	24,832
Net periodic pension/benefit cost	67,450	69,787	68,320
Impact of PUC D&Os	25,828	(18,004)	(18,117)
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)	93,278	51,783	50,203
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015
Prior service credit	0
Net actuarial loss	15,400
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries
Defined benefit plans
Service cost	67,359	63,059	58,796
Interest cost	71,294	74,632	74,808
Expected return on plan assets	(102,368)	(95,892)	(91,633)
Amortization of net prior service (gain) cost	8	8	13
Amortization of net actuarial losses	27,302	24,392	22,693
Net periodic pension/benefit cost	63,595	66,199	64,677
Impact of PUC D&Os	25,828	(18,004)	(18,117)
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)	89,423	48,195	46,560
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015
Prior service credit	0
Net actuarial loss	14,300
Other benefits
Defined benefit plans
Service cost	2,721	3,374	3,331
Interest cost	7,933	9,453	9,670
Expected return on plan assets	(12,908)	(12,326)	(12,273)
Amortization of net prior service (gain) cost	(1,805)	(1,793)	(1,793)
Amortization of net actuarial losses	95	1,130	804
Net periodic pension/benefit cost	(3,964)	(162)	(261)
Impact of PUC D&Os	3,842	1,211	1,343
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)	(122)	1,049	1,082
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015
Prior service credit	(1,800)
Net actuarial loss	0
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries
Defined benefit plans
Service cost	2,704	3,353	3,284
Interest cost	7,628	9,115	9,337
Expected return on plan assets	(12,713)	(12,147)	(12,096)
Amortization of net prior service (gain) cost	(1,803)	(1,804)	(1,803)
Amortization of net actuarial losses	98	1,102	793
Net periodic pension/benefit cost	(4,086)	(381)	(485)
Impact of PUC D&Os	3,842	1,211	1,343
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)	(244)	$ 830	$ 858
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015
Prior service credit	(1,800)
Net actuarial loss	$ 0

Share-based compensation - Addi

Share-based compensation - Additional Information (Details) $ in Millions	Mar. 01, 2014shares	Jul. 31, 2016USD ($)	Dec. 31, 2018USD ($)incrementshares	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Share-based compensation
Share-based compensation expense			$ 7.8	$ 5.4	$ 4.8
Income tax benefit			$ 1.1	1.9	1.6
Long-term incentive plan (LTIP)
Share-based compensation
Performance period			3 years
Exception to forfeiture, minimum requisite service period			12 months
Payout low end of range			0.00%
Payout high end of range			200.00%
Restricted stock units
Share-based compensation
Fair value of vested stock			$ 2.7	3.5	2.8
Income tax benefit			0.4	1.1	0.9
Unrecognized compensation cost			$ 4
Weighted-average period over which unrecognized compensation cost expected to be recognized			2 years 6 months
LTIP linked to TRS
Share-based compensation
Fair value of vested stock				1.9
Income tax benefit				0.7
Unrecognized compensation cost			$ 1.2
Weighted-average period over which unrecognized compensation cost expected to be recognized			1 year 6 months
LTIP awards linked to other performance conditions
Share-based compensation
Fair value of vested stock				4.2	3.6
Income tax benefit				$ 1.6	$ 1.4
Unrecognized compensation cost			$ 4.5
Weighted-average period over which unrecognized compensation cost expected to be recognized			1 year 6 months
Equity and Incentive Plan (EIP)
Share-based compensation
Additional shares available for issuance | shares	1,500,000
Shares remaining available for future issuance | shares			3,200,000
Shares that can be issued upon vesting of outstanding units and achievement of performance goals | shares			600,000
Equity and Incentive Plan (EIP) | Restricted shares
Share-based compensation
The number of equal annual increments for which the awards become unrestricted (in installments) | increment			4
Nonemployee Director Stock Plan
Share-based compensation
Shares remaining available for future issuance | shares			46,607
Nonemployee Director Stock Plan | Stock Compensation Plan
Share-based compensation
Share-based compensation expense		$ 0.2

Share-based compensation - Rela

Share-based compensation - Related Income Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 7.8	$ 5.4	$ 4.8
Income tax benefit	1.1	1.9	1.6
Hawaiian Electric Company, Inc. and Subsidiaries
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	2.7	1.9	1.4
Income tax benefit	$ 0.5	$ 0.7	$ 0.5

Share-based compensation - The

Share-based compensation - The 2011 Director Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit	$ 1.1	$ 1.9	$ 1.6
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	38,821	35,770	19,846
Fair value of vested stock	$ 1.3	$ 1.2	$ 0.6
Income tax benefit	$ 0.3	$ 0.5	$ 0.2

Share-based compensation - Rest

Share-based compensation - Restricted Stock Units (Details) - Restricted stock units - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation, Restricted Shares [Roll Forward]
Outstanding, beginning of period (in shares)	197,047	220,683	210,634
Granted (in shares)	93,853	97,873	114,431
Vested (in shares)	(75,683)	(92,147)	(85,003)
Forfeited (in shares)	(14,859)	(29,362)	(19,379)
Outstanding, end of period (in shares)	200,358	197,047	220,683
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, beginning of period (in dollars per share)	$ 31.53	$ 29.57	$ 28.82
Granted (in dollars per share)	34.12	33.47	29.70
Vested (in dollars per share)	30.56	28.88	27.84
Forfeited (in dollars per share)	32.35	31.57	29.82
Outstanding, end of period (in dollars per share)	$ 33.05	$ 31.53	$ 29.57
Total weighted-average grant-date fair value	$ 3.2	$ 3.3	$ 3.4

Share-based compensation - LTIP

Share-based compensation - LTIP Linked to TRS (Details) - LTIP linked to TRS - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation, Restricted Shares [Roll Forward]
Outstanding, beginning of period (in shares)	32,904	83,106	162,500
Granted (in shares)	37,832	37,204	0
Vested (issued or unissued and cancelled) (in shares)	0	(83,106)	(78,553)
Forfeited (in shares)	(5,158)	(4,300)	(841)
Outstanding, end of period (in shares)	65,578	32,904	83,106
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, beginning of period (in dollars per share)	$ 39.51	$ 22.95	$ 27.66
Granted (in dollars per share)	38.21	39.51	0
Vested (issued or unissued and cancelled) (in dollars per share)	0	22.95	32.69
Forfeited (in dollars per share)	38.84	39.51	22.95
Outstanding, end of period (in dollars per share)	$ 38.81	$ 39.51	$ 22.95
Total weighted-average grant-date fair value	$ 1.4	$ 1.5	$ 0

Share-based compensation - Assu

Share-based compensation - Assumptions to Determine the Fair Value of LTIP Awards Linked to TRS (Details) - LTIP linked to TRS - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.29%	1.46%
Expected life (in years)	3 years	3 years
Expected volatility	17.00%	20.10%
Range of expected volatility for Peer Group, minimum	15.10%	15.40%
Range of expected volatility for Peer Group, maximum	26.20%	26.00%
Grant date fair value (in dollars per share)	$ 38.20	$ 39.51

Share-based compensation - LT_2

Share-based compensation - LTIP Awards Linked To Other Performance Conditions (Details) - LTIP awards linked to other performance conditions - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation, Restricted Shares [Roll Forward]
Outstanding, beginning of period (in shares)	131,616	109,816	222,647
Granted (in shares)	151,328	148,818	0
Vested (in shares)	0	(109,816)	(109,097)
Increased above target (cancelled) (in shares)	13,858	0	(1,989)
Forfeited (in shares)	(20,633)	(17,202)	(1,745)
Outstanding, end of period (in shares)	276,169	131,616	109,816
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, beginning of period (in dollars per share)	$ 33.47	$ 25.18	$ 26.02
Granted (in dollars per share)	34.12	33.47	0
Vested (in dollars per share)	0	25.18	26.89
Increased above target (cancelled) (in dollars per share)	33.49	0	25.26
Forfeited (in dollars per share)	33.80	33.48	25.19
Outstanding, end of period (in dollars per share)	$ 33.80	$ 33.47	$ 25.18
Total weighted-average grant-date fair value	$ 5.2	$ 5	$ 0

Income taxes - Components of In

Income taxes - Components of Income Taxes Attributable to Net Income for Common Stock (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal
Current	$ 42,903	$ 61,534	$ 59,873
Deferred	(6,099)	33,967	43,666
Deferred tax credits, net	(12)	(20)	268
Federal taxes	36,792	95,481	103,807
State
Current	17,361	10,076	16,473
Deferred	(3,269)	3,868	3,452
Deferred tax credits, net	(87)	(32)	(37)
State taxes	14,005	13,912	19,888
Federal and state taxes	50,797	109,393	123,695
Hawaiian Electric Company, Inc. and Subsidiaries
Federal
Current	29,649	36,267	952
Deferred	(5,245)	35,229	70,513
Deferred tax credits, net	(12)	(20)	268
Federal taxes	24,392	71,476	71,733
State
Current	13,210	8,947	9,232
Deferred	(2,737)	2,808	3,873
Deferred tax credits, net	(87)	(32)	(37)
State taxes	10,386	11,723	13,068
Federal and state taxes	$ 34,778	$ 83,199	$ 84,801

Income taxes - Income Tax Recon

Income taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit) [Line Items]
Amount at the federal statutory income tax rate	$ 53,437	$ 96,796	$ 130,844
Increase (decrease) resulting from:
State income taxes, net of federal income tax benefit	11,832	9,789	13,915
Net deferred tax asset (liability) adjustment related to the Tax Act	(9,540)	13,420	0
Other, net	(4,932)	(10,612)	(21,064)
Federal and state taxes	$ 50,797	$ 109,393	$ 123,695
Effective income tax rate	20.00%	39.60%	33.10%
Hawaiian Electric Company, Inc. and Subsidiaries
Income Tax Expense (Benefit) [Line Items]
Amount at the federal statutory income tax rate	$ 37,889	$ 71,801	$ 80,190
Increase (decrease) resulting from:
State income taxes, net of federal income tax benefit	8,080	7,584	8,494
Net deferred tax asset (liability) adjustment related to the Tax Act	(9,285)	9,168	0
Other, net	(1,906)	(5,354)	(3,883)
Federal and state taxes	$ 34,778	$ 83,199	$ 84,801
Effective income tax rate	19.30%	40.60%	37.00%

Income taxes - Deferred Tax Ass

Income taxes - Deferred Tax Assets and Liabilities Due to Book/Tax Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets
Regulatory liabilities, excluding amounts attributable to property, plant and equipment	$ 104,868	$ 104,984
Allowance for bad debts	14,647	16,192
Other	46,036	24,397
Total deferred tax assets	165,551	145,573
Deferred tax liabilities
Property, plant and equipment related	437,644	415,452
Regulatory assets, excluding amounts attributable to property, plant and equipment	37,345	38,314
Deferred RAM and RBA revenues	11,278	15,038
Retirement benefits	20,173	32,952
Other	31,629	32,247
Total deferred tax liabilities	538,069	534,003
Net deferred income tax liability	372,518	388,430
Hawaiian Electric Company, Inc. and Subsidiaries
Deferred tax assets
Regulatory liabilities, excluding amounts attributable to property, plant and equipment	104,868	104,984
Allowance for bad debts	659	1,812
Other	26,522	11,253
Total deferred tax assets	132,049	118,049
Deferred tax liabilities
Property, plant and equipment related	434,831	413,891
Regulatory assets, excluding amounts attributable to property, plant and equipment	37,345	38,314
Deferred RAM and RBA revenues	11,278	15,038
Retirement benefits	25,430	38,020
Other	6,362	6,827
Total deferred tax liabilities	515,246	512,090
Net deferred income tax liability	$ 383,197	$ 394,041

Income taxes - Additional Infor

Income taxes - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit) [Line Items]
Deferred tax assets, valuation allowance	$ 0	$ 0	$ 0
Unrecognized tax benefits that would impact effective tax rate	500,000	500,000	500,000
Credit adjustments to interest expense on income taxes		(100,000)	200,000	$ 200,000
Amount of accrued interest related to uncertain tax positions	500,000	400,000	500,000
Decrease in net deferred tax liability		13,900,000	271,500,000
Net tax expense due to impact of the Tax Act	14,200,000		13,400,000
Tax Act, Increase in regulatory liabilities		11,300,000	$ 284,900,000
Effect of remeasurement of deferred tax assets and liabilities		$ 5,500,000
Effective income tax rate before adjustments		22.10%
Effective income tax rate		20.00%	39.60%	33.10%
Hawaiian Electric Company, Inc. and Subsidiaries
Income Tax Expense (Benefit) [Line Items]
Credit adjustments to interest expense on income taxes		$ 100,000	$ 100,000	$ 30,000
Amount of accrued interest related to uncertain tax positions	200,000	300,000	200,000
Decrease in net deferred tax liability		13,600,000	275,700,000
Net tax expense due to impact of the Tax Act	$ 9,200,000		$ 9,200,000
Effect of remeasurement of deferred tax assets and liabilities		$ 5,200,000
Effective income tax rate before adjustments		22.20%
Effective income tax rate		19.30%	40.60%	37.00%

Income taxes - Changes in Unrec

Income taxes - Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in total unrecognized tax benefits
Unrecognized tax benefits, at the beginning of the period	$ 4	$ 3.8	$ 3.6
Additions based on tax positions taken during the year	0.3	0.9	0
Reductions based on tax positions taken during the year	0	(0.2)	(0.1)
Additions for tax positions of prior years	0.1	0	0.3
Reductions for tax positions of prior years	(0.1)	(0.5)	0
Lapses of statute of limitations	(2.2)	0	0
Unrecognized tax benefits, at the end of the period	2.1	4	3.8
Hawaiian Electric Company, Inc. and Subsidiaries
Changes in total unrecognized tax benefits
Unrecognized tax benefits, at the beginning of the period	3.5	3.8	3.6
Additions based on tax positions taken during the year	0.3	0.4	0
Reductions based on tax positions taken during the year	0	(0.2)	(0.1)
Additions for tax positions of prior years	0.1	0	0.3
Reductions for tax positions of prior years	(0.1)	(0.5)	0
Lapses of statute of limitations	(2.2)	0	0
Unrecognized tax benefits, at the end of the period	$ 1.6	$ 3.5	$ 3.8

Cash flows (Details)

Cash flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental disclosures of cash flow information
Interest paid to non-affiliates, net of amounts capitalized	$ 102,000	$ 83,000	$ 84,000
Income taxes paid (including refundable credits)	72,000	55,000	55,000
Income taxes refunded (including refundable credits)	34,000	1,000	45,000
Supplemental disclosures of noncash activities
Unpaid invoices and accruals for capital expenditures (investing), Balance, end of period	59,000	38,000	84,000
Common stock dividends reinvested in HEI common stock (financing)	0	0	17,000
Loans transferred from held for investment to held for sale (investing)	1,000	41,000	24,000
Real estate acquired in settlement of loans (investing)	0	0	1,000
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing)	0	0	1,000
Common stock issued (gross) for director and executive/management compensation (financing)	4,000	11,000	7,000
Obligations to fund low income housing investments, net (investing)	12,000	13,000	0
Transfer of retail repurchase agreements to deposit liabilities (financing)	102,000	0	0
Hawaiian Electric Company, Inc. and Subsidiaries
Supplemental disclosures of cash flow information
Interest paid to non-affiliates, net of amounts capitalized	73,000	63,000	62,000
Income taxes paid (including refundable credits)	64,000	26,000	1,000
Income taxes refunded (including refundable credits)	31,000	0	20,000
Supplemental disclosures of noncash activities
Unpaid invoices and accruals for capital expenditures (investing), Balance, end of period	44,000	38,000	84,000
Estimated fair value of noncash contributions in aid of construction (investing)	14,000	18,000	28,000
Acquisition of Hawaiian Telcom’s interest in joint poles (investing)	$ 48	$ 0	$ 0

Regulatory restrictions on ne_2

Regulatory restrictions on net assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Regulatory restrictions on net assets
Distribution restrictions, percent of earnings in current year and 5 preceding years if capitalization rate is less than 35%	80.00%
Total capitalization rate of HEI's electric utility subsidiaries	57.00%
Common stock equity	$ 2,162,280	$ 2,097,386	$ 2,066,753	$ 1,927,640
Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory restrictions on net assets
Restrictions on transfer of net assets to the parent in the form of cash dividends, loans and advances	782,000
Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory restrictions on net assets
Common stock equity	1,957,641	1,845,283	$ 1,799,787	$ 1,728,325
American Savings Bank (ASB)
Regulatory restrictions on net assets
Common stock equity	634,389	$ 606,847
Restrictions on transfer of net assets to the parent in the form of cash dividends, loans and advances	$ 474,000

Significant group concentrati_2

Significant group concentrations of credit risk (Details)	12 Months Ended
	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Percentage of benchmark loan to appraisal ratio in excess of which mortgage insurance is required	80.00%

Fair value measurements - Fair

Fair value measurements - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial assets
Available-for-sale investment securities	$ 1,388,533	$ 1,401,198
Held-to-maturity investment securities	142,057	44,412
Financial liabilities
Short-term borrowings—other than bank	73,992	117,945
Other bank borrowings	110,040	190,859
Carrying or notional amount
Financial assets
Available-for-sale investment securities	1,388,533	1,401,198
Held-to-maturity investment securities	141,875	44,515
Stock in Federal Home Loan Bank	9,958	9,706
Loans, net	4,792,707	4,628,381
Mortgage servicing rights	8,062	8,639
Derivative assets	10,180	17,812
Financial liabilities
Deposit liabilities1	827,841	5,890,597
Short-term borrowings—other than bank	73,992	117,945
Other bank borrowings	110,040	190,859
Long-term debt, net—other than bank	1,879,641	1,683,797
Derivative liabilities	34,132	13,562
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries
Financial assets
Derivative assets		3,240
Financial liabilities
Long-term debt, net—other than bank	1,418,802	1,368,479
Short-term borrowings	25,000	4,999
Estimated fair value
Financial assets
Available-for-sale investment securities	1,388,533	1,401,198
Held-to-maturity investment securities	142,057	44,412
Stock in Federal Home Loan Bank	9,958	9,706
Loans, net	4,802,053	4,781,751
Mortgage servicing rights	13,618	12,052
Derivative assets	91	393
Financial liabilities
Deposit liabilities1	817,667	5,884,071
Short-term borrowings—other than bank	73,992	117,945
Other bank borrowings	110,037	190,829
Long-term debt, net—other than bank	1,904,261	1,813,295
Derivative liabilities	630	30
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries
Financial assets
Derivative assets		256
Financial liabilities
Long-term debt, net—other than bank	1,443,968	1,497,079
Short-term borrowings	25,000	4,999
Estimated fair value | Level 1
Financial assets
Available-for-sale investment securities	0	0
Held-to-maturity investment securities	0	0
Stock in Federal Home Loan Bank	0	0
Loans, net	0	0
Mortgage servicing rights	0	0
Derivative assets	0	0
Financial liabilities
Deposit liabilities1	0	0
Short-term borrowings—other than bank	0	0
Other bank borrowings	0	0
Long-term debt, net—other than bank	0	0
Derivative liabilities	34	20
Estimated fair value | Level 1 | Hawaiian Electric Company, Inc. and Subsidiaries
Financial assets
Derivative assets		0
Financial liabilities
Long-term debt, net—other than bank	0	0
Short-term borrowings	0	0
Estimated fair value | Level 2
Financial assets
Available-for-sale investment securities	1,364,897	1,385,771
Held-to-maturity investment securities	142,057	44,412
Stock in Federal Home Loan Bank	9,958	9,706
Loans, net	1,809	11,254
Mortgage servicing rights	0	0
Derivative assets	91	393
Financial liabilities
Deposit liabilities1	817,667	5,884,071
Short-term borrowings—other than bank	73,992	117,945
Other bank borrowings	110,037	190,829
Long-term debt, net—other than bank	1,904,261	1,813,295
Derivative liabilities	596	10
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries
Financial assets
Derivative assets		256
Financial liabilities
Long-term debt, net—other than bank	1,443,968	1,497,079
Short-term borrowings	25,000	4,999
Estimated fair value | Level 3
Financial assets
Available-for-sale investment securities	23,636	15,427
Held-to-maturity investment securities	0	0
Stock in Federal Home Loan Bank	0	0
Loans, net	4,800,244	4,770,497
Mortgage servicing rights	13,618	12,052
Derivative assets	0	0
Financial liabilities
Deposit liabilities1	0	0
Short-term borrowings—other than bank	0	0
Other bank borrowings	0	0
Long-term debt, net—other than bank	0	0
Derivative liabilities	0	0
Estimated fair value | Level 3 | Hawaiian Electric Company, Inc. and Subsidiaries
Financial assets
Derivative assets		0
Financial liabilities
Long-term debt, net—other than bank	0	0
Short-term borrowings	$ 0	$ 0

Fair value measurements - Fai_2

Fair value measurements - Fair Value Measurements on a Recurring Basis (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	$ 1,388,533	$ 1,401,198
Discount rate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Mortgage revenue bonds, measurement input	0.0396
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	$ 1,161,416	1,201,473
U.S. Treasury and federal agency obligations
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	154,349	184,298
Mortgage revenue bonds
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	23,636	15,427
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, January 1	15,427	15,427
Principal payments received	0	0
Purchases	8,209	0
Unrealized gain (loss) included in other comprehensive income	0	0
Balance, December 31	23,636	15,427
Fair value measurements on a recurring basis | Level 1
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	0	0
Derivative liabilities	34	20
Fair value measurements on a recurring basis | Level 1 | Bank
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	0	0
Fair value measurements on a recurring basis | Level 1 | Bank | Interest Rate Lock Commitments
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	0	0
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 1 | Bank | Forward commitments
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	0	0
Derivative liabilities	34	20
Fair value measurements on a recurring basis | Level 1 | Bank | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	0	0
Fair value measurements on a recurring basis | Level 1 | Bank | U.S. Treasury and federal agency obligations
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	0	0
Fair value measurements on a recurring basis | Level 1 | Bank | Corporate bonds
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	0	0
Fair value measurements on a recurring basis | Level 1 | Bank | Mortgage revenue bonds
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	0	0
Fair value measurements on a recurring basis | Level 1 | Electric utility | Window forward contracts
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	0	0
Fair value measurements on a recurring basis | Level 1 | Other | Interest rate swap
Fair value measurements on a recurring and nonrecurring basis
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 2
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	91	393
Derivative liabilities	596	10
Fair value measurements on a recurring basis | Level 2 | Bank
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	1,364,897	1,385,771
Fair value measurements on a recurring basis | Level 2 | Bank | Interest Rate Lock Commitments
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	91	133
Derivative liabilities	0	2
Fair value measurements on a recurring basis | Level 2 | Bank | Forward commitments
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	0	4
Derivative liabilities	9	8
Fair value measurements on a recurring basis | Level 2 | Bank | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	1,161,416	1,201,473
Fair value measurements on a recurring basis | Level 2 | Bank | U.S. Treasury and federal agency obligations
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	154,349	184,298
Fair value measurements on a recurring basis | Level 2 | Bank | Corporate bonds
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	49,132	0
Fair value measurements on a recurring basis | Level 2 | Bank | Mortgage revenue bonds
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	0	0
Fair value measurements on a recurring basis | Level 2 | Electric utility | Window forward contracts
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	0	256
Fair value measurements on a recurring basis | Level 2 | Other | Interest rate swap
Fair value measurements on a recurring and nonrecurring basis
Derivative liabilities	587	0
Fair value measurements on a recurring basis | Level 3
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	0	0
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 3 | Bank
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	23,636	15,427
Fair value measurements on a recurring basis | Level 3 | Bank | Interest Rate Lock Commitments
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	0	0
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 3 | Bank | Forward commitments
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	0	0
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 3 | Bank | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	0	0
Fair value measurements on a recurring basis | Level 3 | Bank | U.S. Treasury and federal agency obligations
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	0	0
Fair value measurements on a recurring basis | Level 3 | Bank | Corporate bonds
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	0	0
Fair value measurements on a recurring basis | Level 3 | Bank | Mortgage revenue bonds
Fair value measurements on a recurring and nonrecurring basis
Available-for-sale, at fair value	23,636	15,427
Fair value measurements on a recurring basis | Level 3 | Electric utility | Window forward contracts
Fair value measurements on a recurring and nonrecurring basis
Derivative assets	0	0
Fair value measurements on a recurring basis | Level 3 | Other | Interest rate swap
Fair value measurements on a recurring and nonrecurring basis
Derivative liabilities	$ 0	$ 0

Fair value measurements - Fai_3

Fair value measurements - Fair Value Measurements on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Estimated fair value
Fair value measurements on a recurring and nonrecurring basis
Loans	$ 4,802,053	$ 4,781,751
Level 1 | Estimated fair value
Fair value measurements on a recurring and nonrecurring basis
Loans	0	0
Level 2 | Estimated fair value
Fair value measurements on a recurring and nonrecurring basis
Loans	1,809	11,254
Level 3 | Estimated fair value
Fair value measurements on a recurring and nonrecurring basis
Loans	4,800,244	4,770,497
Fair value measurements on a nonrecurring basis | Estimated fair value
Fair value measurements on a recurring and nonrecurring basis
Loans	77	2,621
Real estate acquired in settlement of loans	186
Fair value measurements on a nonrecurring basis | Level 1
Fair value measurements on a recurring and nonrecurring basis
Loans	0	0
Real estate acquired in settlement of loans	0
Fair value measurements on a nonrecurring basis | Level 2
Fair value measurements on a recurring and nonrecurring basis
Loans	0	0
Real estate acquired in settlement of loans	0
Fair value measurements on a nonrecurring basis | Level 3
Fair value measurements on a recurring and nonrecurring basis
Loans	77	$ 2,621
Real estate acquired in settlement of loans	$ 186

Fair value measurements - Quant

Fair value measurements - Quantitative Information About Level 3 Fair Value Measurements (Details) - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Home equity line of credit | Fair value of property or collateral
Fair value measurements
Fair value	$ 77
Selling cost	7.00%
Loans
Fair value measurements
Fair value	$ 77	$ 2,621
Real estate acquired in settlement of loans | Fair value of property or collateral
Fair value measurements
Fair value	$ 186
Selling cost	7.00%
Residential loan | Fair value of collateral
Fair value measurements
Fair value		$ 613
Selling cost		7.00%
Residential loan | Fair value of collateral | Minimum
Fair value measurements
Appraised value		71.00%
Residential loan | Fair value of collateral | Maximum
Fair value measurements
Appraised value		92.00%
Residential loan | Fair value of collateral | Weighted Average
Fair value measurements
Appraised value, weighted average rate		84.00%
Commercial | Fair value of property or collateral | Weighted Average
Fair value measurements
Appraised value, weighted average rate		75.00%
Commercial | Fair value of collateral
Fair value measurements
Fair value		$ 2,008
Commercial | Fair value of collateral | Minimum
Fair value measurements
Appraised value		71.00%
Commercial | Fair value of collateral | Maximum
Fair value measurements
Appraised value		76.00%

Termination of proposed merge_2

Termination of proposed merger and other matters (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			6 Months Ended	12 Months Ended
	Jul. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2016	Dec. 31, 2016
Hawaiian Electric Company, Inc. and Subsidiaries
Business Acquisition [Line Items]
Merger termination, expenses recognized			$ 1	$ 1
NextEra Energy, Inc Merger
Business Acquisition [Line Items]
Merger contract termination fee	$ 90
Maximum expenses paid to party for cancellation of merger	$ 5
Gain (loss) recognized, merger termination						$ 60
Merger termination, merger-and-spin-off related expenses, net of taxes		$ 64	$ (2)	$ (2)		$ (6)
Merger termination, termination fee		55
Merger termination, insurance reimbursements		$ 3
Recognition of previously disallowed merger and acquisition expenses					$ 8

Quarterly information (unaudi_3

Quarterly information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 761,650	$ 768,048	$ 685,277	$ 645,874	$ 658,597	$ 673,185	$ 632,281	$ 591,562	$ 2,860,849	$ 2,555,625	$ 2,380,654
Operating income	84,604	98,064	78,799	71,889	87,220	111,473	77,802	69,738	333,356	346,233	355,838
Net income	50,046	66,371	46,527	40,720	32,843	60,544	39,134	34,666	203,664	167,187	250,146
Net income for common stock	$ 49,573	$ 65,900	$ 46,054	$ 40,247	$ 32,370	$ 60,073	$ 38,661	$ 34,193	$ 201,774	$ 165,297	$ 248,256
Basic earnings per common share (in dollars per share)	$ 0.46	$ 0.61	$ 0.42	$ 0.37	$ 0.30	$ 0.55	$ 0.36	$ 0.31	$ 1.85	$ 1.52	$ 2.30
Diluted earnings per common share (in dollars per share)	0.45	0.60	0.42	0.37	0.30	0.55	0.36	0.31	1.85	1.52	2.29
Dividends declared per common share (in dollars per share)	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 0.31	$ 1.24	$ 1.24	$ 1.24
Net tax expense due to impact of the Tax Act					$ 14,200					$ 13,400
Deferred tax expense (benefit) tax cuts and job act of 2017, adjustment for bonuses paid					700
Hawaiian Electric Company, Inc. and Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 680,563	$ 687,409	$ 608,126	$ 570,427	583,311	$ 598,769	$ 556,875	$ 518,611	$ 2,546,525	2,257,566
Operating income	61,112	74,036	55,144	51,369	68,184	88,497	56,482	50,361	241,661	263,524	$ 290,070
Net income	35,796	50,210	31,668	27,974	25,854	47,985	26,143	21,964	145,648	121,946	144,312
Net income for common stock	$ 35,297	$ 49,712	$ 31,169	$ 27,475	25,355	$ 47,487	25,644	21,465	$ 143,653	119,951	$ 142,317
Net tax expense due to impact of the Tax Act					$ 9,200					$ 9,200
Settlement agreement expiration, tax expense (benefit)							8,000	12,000
Settlement agreement expiration, revenue adjustment, net of taxes							$ 4,000	$ 7,000

SCHEDULE I - CONDENSED FINANC_2

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - BALANCE SHEETS (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 169,208	$ 261,881	$ 278,452	$ 300,478
Accounts receivable	325,672	263,209
Property, plant and equipment, net	4,830,118	4,460,248
Other assets	530,364	513,535
Total assets	13,104,051	12,534,160	11,881,981
Liabilities
Accounts payable	214,773	193,714
Long-term debt, net	1,879,641	1,683,797
Other	580,788	521,018
Total liabilities	10,907,478	10,402,481
Shareholders' equity
Preferred stock, no par value, authorized 10,000,000 shares; issued: none	0	0
Common stock equity	1,669,267	1,662,491
Retained earnings	543,623	476,836
Accumulated other comprehensive loss	(50,610)	(41,941)
Total shareholders’ equity	2,162,280	2,097,386	2,066,753	1,927,640
Total capitalization and liabilities	$ 13,104,051	$ 12,534,160
Preferred stock, authorized shares	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, authorized shares	200,000,000	200,000,000
Common stock, issued shares	108,879,245	108,787,807
Common stock, outstanding shares	108,879,245	108,787,807
Hawaiian Electric Industries, Inc.
Assets
Cash and cash equivalents	$ 3,742	$ 11,702	$ 14,924	$ 55,116
Accounts receivable	2,604	2,347
Notes receivable	20,789	0
Property, plant and equipment, net	3,456	3,910
Deferred income tax assets	10,147	8,710
Other assets	11,963	15,480
Investments in subsidiaries, at equity	2,605,038	2,466,342
Total assets	2,657,739	2,508,491
Liabilities
Accounts payable	2,001	561
Interest payable	3,476	2,319
Notes payable to subsidiaries	34	1,918
Commercial paper	48,992	62,993
Short-term debt, net	0	49,953
Long-term debt, net	398,874	249,588
Retirement benefits liability	29,565	31,518
Other	12,517	12,255
Total liabilities	495,459	411,105
Shareholders' equity
Preferred stock, no par value, authorized 10,000,000 shares; issued: none	0	0
Common stock equity	1,669,267	1,662,491
Retained earnings	543,623	476,836
Accumulated other comprehensive loss	(50,610)	(41,941)
Total shareholders’ equity	2,162,280	2,097,386
Total capitalization and liabilities	$ 2,657,739	$ 2,508,491
Preferred stock, authorized shares	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, authorized shares	200,000,000	200,000,000
Common stock, issued shares	108,879,245	108,787,807
Common stock, outstanding shares	108,879,245	108,787,807

SCHEDULE I - CONDENSED FINANC_3

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF INCOME AND CHANGES IN SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Revenues									$ 2,614,831		$ 2,380,654
Expenses:
Depreciation of property, plant and equipment									214,036	$ 200,658	194,273
Total expenses									2,527,493	2,209,392	2,024,816
Merger termination fee									0	0	90,000
Retirement defined benefits expense—other than service costs									5,962	7,942	7,663
Interest expense									104,216	91,128	88,558
Income before income taxes									254,461	276,580	373,841
Income (taxes) benefits									(50,797)	(109,393)	(123,695)
Net income (loss)	$ 50,046	$ 66,371	$ 46,527	$ 40,720	$ 32,843	$ 60,544	$ 39,134	$ 34,666	203,664	167,187	250,146
Hawaiian Electric Industries, Inc.
Revenues
Revenues									429	798	647
Equity in net income of subsidiaries									226,972	187,097	199,485
Expenses:
Operating, administrative and general									19,515	16,578	17,515
Depreciation of property, plant and equipment									597	548	566
Taxes, other than income taxes									509	496	4,726
Total expenses									20,621	17,622	22,807
Income before merger termination fee, interest expense and income (taxes) benefits									206,780	170,273	177,325
Merger termination fee									0	0	90,000
Income before interest expense and income (taxes) benefits									206,780	170,273	267,325
Retirement defined benefits expense—other than service costs									674	1,119	1,186
Interest expense									12,664	9,389	9,037
Income before income taxes									193,442	159,765	257,102
Income (taxes) benefits									8,332	5,532	(8,846)
Net income (loss)									$ 201,774	$ 165,297	$ 248,256

SCHEDULE I - CONDENSED FINANC_4

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net cash provided by operating activities	$ 499,312	$ 420,441	$ 495,658
Cash flows from investing activities
Capital expenditures	(537,369)	(495,187)	(330,043)
Other, net	13,945	6,468	856
Net cash used in investing activities	(792,059)	(815,299)	(736,465)
Cash flows from financing activities
Net increase (decrease) in short-term borrowings with original maturities of three months or less	(18,999)	67,992	(103,063)
Proceeds from issuance of short-term debt	25,000	125,000	0
Repayment of short-term debt	(50,000)	(75,000)	0
Proceeds from issuance of long-term debt	250,000	532,325	115,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds	(53,887)	(465,000)	(75,000)
Net proceeds from issuance of common stock	0	0	13,220
Common stock dividends	(134,987)	(134,873)	(117,274)
Other	(1,603)	(6,349)	2,197
Net cash used in financing activities	200,074	378,287	218,781
Net decrease in cash and equivalents	(92,673)	(16,571)	(22,026)
Cash and cash equivalents, January 1	261,881	278,452	300,478
Cash and cash equivalents, December 31	169,208	261,881	278,452
Hawaiian Electric Industries, Inc.
Cash flows from operating activities
Net cash provided by operating activities	135,470	99,600	191,710
Cash flows from investing activities
Increase in note receivable from subsidiary	(20,596)	(70,000)	0
Decrease in note receivable from subsidiary	0	(66,391)	0
Capital expenditures	(143)	(317)	(212)
Investments in subsidiaries	(71,970)	(22,353)	(24,000)
Other, net	140	(177)	1
Net cash used in investing activities	(92,569)	(26,456)	(24,211)
Cash flows from financing activities
Net increase (decrease) in notes payable to subsidiaries with original maturities of three months or less	(30)	98	(618)
Net increase (decrease) in short-term borrowings with original maturities of three months or less	(14,000)	62,993	(103,063)
Proceeds from issuance of short-term debt	0	125,000	0
Repayment of short-term debt	(50,000)	(75,000)	0
Proceeds from issuance of long-term debt	150,000	150,000	75,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds	0	(200,000)	(75,000)
Withheld shares for employee taxes on vested share-based compensation	(996)	(3,828)	(2,416)
Net proceeds from issuance of common stock	0	0	13,220
Common stock dividends	(134,987)	(134,873)	(117,274)
Other	(848)	(756)	2,460
Net cash used in financing activities	(50,861)	(76,366)	(207,691)
Net decrease in cash and equivalents	(7,960)	(3,222)	(40,192)
Cash and cash equivalents, January 1	11,702	14,924	55,116
Cash and cash equivalents, December 31	$ 3,742	$ 11,702	$ 14,924

SCHEDULE I - CONDENSED FINANC_5

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Less unamortized debt issuance costs	$ (2,599,000)	$ (2,007,000)
Long-term debt, net—other than bank	1,879,641,000	1,683,797,000
2,019	4,000,000
2,020	100,000,000
2,021	54,000,000
2,022	206,000,000
2,023	154,000,000
Issuance of common stock, net of expenses			$ 26,844,000
Common stock
Condensed Financial Statements, Captions [Line Items]
Issuance of common stock, net of expenses			26,844,000
Hamakua Energy Partners, L.P. (HEP)
Condensed Financial Statements, Captions [Line Items]
Notes receivable converted into equity		3,600,000
Self Insured United States Longshore and Horbor Bond
Condensed Financial Statements, Captions [Line Items]
Maximum undiscounted exposure	600,000
Self Insured Automobile Bond
Condensed Financial Statements, Captions [Line Items]
Maximum undiscounted exposure	700,000
Hawaiian Electric Industries, Inc.
Condensed Financial Statements, Captions [Line Items]
Less unamortized debt issuance costs	(1,126,000)	(412,000)
Long-term debt, net—other than bank	398,874,000	249,588,000
2,019	0
2,020	0
2,021	50,000,000
2,022	150,000,000
2,023	50,000,000
Cash dividends paid	154,000,000	125,000,000	130,000,000
Hawaiian Electric Industries, Inc. | Common stock
Condensed Financial Statements, Captions [Line Items]
Issuance of common stock, net of expenses	0	0	17,000,000
Hawaiian Electric Industries, Inc. | ASB Hawaii, Inc. | Consolidated subsidiary
Condensed Financial Statements, Captions [Line Items]
Accounts receivable reduction	2,300,000	2,800,000	2,300,000
HEI notes payable increase to ASHI	2,300,000	2,800,000	$ 2,300,000
Hawaiian Electric Industries, Inc. | HEI loan 2.99%, due 2022
Condensed Financial Statements, Captions [Line Items]
Gross long-term debt	$ 150,000,000	150,000,000
Debt instrument, stated interest rate	2.99%
Hawaiian Electric Industries, Inc. | HEI 5.67% senior notes, due 2021
Condensed Financial Statements, Captions [Line Items]
Gross long-term debt	$ 50,000,000	50,000,000
Debt instrument, stated interest rate	5.67%
Hawaiian Electric Industries, Inc. | HEI 3.99% senior notes, due 2023
Condensed Financial Statements, Captions [Line Items]
Gross long-term debt	$ 50,000,000	50,000,000
Debt instrument, stated interest rate	3.99%
Hawaiian Electric Industries, Inc. | HEI 4.58% senior notes, due 2025
Condensed Financial Statements, Captions [Line Items]
Gross long-term debt	$ 50,000,000	0
Debt instrument, stated interest rate	4.58%
Hawaiian Electric Industries, Inc. | HEI 4.72% senior notes, due 2028
Condensed Financial Statements, Captions [Line Items]
Gross long-term debt	$ 100,000,000	$ 0
Debt instrument, stated interest rate	4.72%

SCHEDULE II - VALUATION AND Q_2

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation and qualifying accounts
Reclassifications of allowance from one customer account into long term assets	$ (4,934)	$ 841	$ 1,790
Allowance for uncollectible accounts – electric utility | Hawaiian Electric Company, Inc. and Subsidiaries
Valuation and qualifying accounts
Balance at beginning of period	1,178	1,121	1,699
Charged to costs and expenses	2,474	1,810	2,383
Charged to other accounts	(4,099)	785	877
Deductions	(1,927)	2,538	3,838
Balance at end of period	1,480	1,178	1,121
Allowance for uncollectible interest – bank | Bank
Valuation and qualifying accounts
Balance at beginning of period	367	1,834	1,679
Charged to costs and expenses	0	0	0
Charged to other accounts	6	0	155
Deductions	0	1,467	0
Balance at end of period	373	367	1,834
Allowance for losses for loans – bank | Bank
Valuation and qualifying accounts
Balance at beginning of period	53,637	55,533	50,038
Charged to costs and expenses	14,745	10,901	16,763
Charged to other accounts	4,254	4,016	2,977
Deductions	20,517	16,813	14,245
Balance at end of period	52,119	53,637	55,533
Deferred tax valuation allowance – HEI
Valuation and qualifying accounts
Balance at beginning of period	$ 0	38	54
Charged to costs and expenses		0	0
Charged to other accounts		0	0
Deductions		38	16
Balance at end of period		$ 0	$ 38