Bank of Hawaii (BOH) 10-K 1 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 16, 2019	Jun. 30, 2018
Document and Entity Information
Entity Registrant Name	BANK OF HAWAII CORP
Entity Central Index Key	46,195
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 Shell Company	false
Entity Public Float			$ 3,422,918,887
Entity Common Stock, Shares Outstanding		41,212,202
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Entity Small Business	false
Entity Emerging Growth Company	false

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Income
Interest and Fees on Loans and Leases	$ 410,597	$ 370,441	$ 333,239
Income on Investment Securities
Available-for-Sale	50,152	46,772	41,892
Held-to-Maturity	84,310	81,740	79,087
Deposits	34	15	9
Funds Sold	3,723	3,882	2,861
Other	1,357	944	812
Total Interest Income	550,173	503,794	457,900
Interest Expense
Deposits	41,143	22,332	12,647
Securities Sold Under Agreements to Repurchase	18,519	19,592	23,406
Funds Purchased	609	123	12
Short-Term Borrowings	145	64	0
Other Debt	3,405	4,445	4,256
Total Interest Expense	63,821	46,556	40,321
Net Interest Income	486,352	457,238	417,579
Provision for Credit Losses	13,425	16,900	4,750
Net Interest Income After Provision for Credit Losses	472,927	440,338	412,829
Noninterest Income
Trust and Asset Management	43,877	45,430	46,203
Mortgage Banking	8,437	12,949	19,895
Service Charges on Deposit Accounts	28,811	32,575	33,654
Fees, Exchange, and Other Service Charges	57,482	54,845	55,176
Investment Securities Gains (Losses), Net	(3,938)	10,430	10,203
Annuity and Insurance	5,822	6,858	7,017
Bank-Owned Life Insurance	7,199	6,517	6,561
Other	21,233	15,813	18,634
Total Noninterest Income	168,923	185,417	197,343
Noninterest Expense
Salaries and Benefits	213,208	203,729	199,353
Net Occupancy	34,742	32,536	30,252
Net Equipment	23,852	22,078	20,578
Data Processing	17,846	15,483	15,208
Professional Fees	9,992	11,681	10,072
FDIC Insurance	7,732	8,666	8,615
Other	64,252	63,518	66,500
Total Noninterest Expense	371,624	357,691	350,578
Income Before Provision for Income Taxes	270,226	268,064	259,594
Provision for Income Taxes	50,624	83,392	78,133
Net Income	$ 219,602	$ 184,672	$ 181,461
Basic Earnings Per Share (in dollars per share)	$ 5.26	$ 4.37	$ 4.26
Diluted Earnings Per Share (in dollars per share)	5.23	4.33	4.23
Dividends Declared Per Share (in dollars per share)	$ 2.34	$ 2.04	$ 1.89
Basic Weighted Average Shares (in shares)	41,714,770	42,280,931	42,644,100
Diluted Weighted Average Shares (in shares)	41,999,399	42,607,057	42,879,783

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	$ 219,602	$ 184,672	$ 181,461
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) on Investment Securities	(6,525)	(1,986)	(10,318)
Defined Benefit Plans, Net	(2,326)	1,177	(31)
Other Comprehensive Income (Loss)	(8,851)	(809)	(10,349)
Comprehensive Income	$ 210,751	$ 183,863	$ 171,112

Consolidated Statements of Cond

Consolidated Statements of Condition - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Interest-Bearing Deposits in Other Banks	$ 3,028	$ 3,421
Federal Funds Sold	198,860	181,413
Investment Securities
Available-for-Sale	2,007,942	2,232,979
Held-to-Maturity (Fair Value of $3,413,994 and $3,894,121)	3,482,092	3,928,170
Loans Held for Sale	10,987	19,231
Loans and Leases	10,448,774	9,796,947
Allowance for Loan and Lease Losses	(106,693)	(107,346)
Net Loans and Leases	10,342,081	9,689,601
Total Earning Assets	16,044,990	16,054,815
Due from Banks	324,081	263,017
Premises and Equipment, Net	151,837	130,926
Accrued Interest Receivable	51,230	50,485
Foreclosed Real Estate	1,356	1,040
Mortgage Servicing Rights	24,310	24,622
Goodwill	31,517	31,517
Bank-Owned Life Insurance	283,771	280,034
Other Assets	230,882	252,596
Total Assets	17,143,974	17,089,052
Deposits
Noninterest-Bearing Demand	4,739,596	4,724,300
Interest-Bearing Demand	3,002,925	3,082,563
Savings	5,539,199	5,389,013
Time	1,745,522	1,688,092
Total Deposits	15,027,242	14,883,968
Short-term Debt	199	0
Securities Sold Under Agreements to Repurchase	504,296	505,293
Long-Term Debt	135,643	260,716
Retirement Benefits Payable	40,494	37,312
Accrued Interest Payable	8,253	6,946
Taxes Payable and Deferred Taxes	19,736	24,009
Other Liabilities	139,911	138,940
Total Liabilities	15,875,774	15,857,184
Commitments, Contingencies, and Guarantees (Note 20)
Shareholders' Equity
Common Stock ($.01 par value; authorized 500,000,000 shares; issued / outstanding: December 31, 2018 - 58,063,689 / 41,499,898 and December 31, 2017 - 57,959,074 / 42,401,443)	577	576
Capital Surplus	571,704	561,161
Accumulated Other Comprehensive Loss	(51,043)	(34,715)
Retained Earnings	1,641,314	1,512,218
Treasury Stock, at Cost (Shares: December 31, 2018 - 16,563,791 and December 31, 2017 - 15,557,631)	(894,352)	(807,372)
Total Shareholders' Equity	1,268,200	1,231,868
Total Liabilities and Shareholders' Equity	$ 17,143,974	$ 17,089,052

Consolidated Statements of Co_2

Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Held-to-Maturity, Fair Value	$ 3,413,994	$ 3,894,121
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized shares	500,000,000	500,000,000
Common Stock, issued shares	58,063,689	57,959,074
Common Stock, outstanding shares	41,499,898	42,401,443
Treasury Stock, Shares	16,563,791	15,557,631

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Balance at Beginning of Period at Dec. 31, 2015	$ 1,116,260	$ 575	$ 542,041	$ (23,557)	$ 1,316,260	$ (719,059)
Beginning Balance (in shares) at Dec. 31, 2015		43,282,153
Increase (decrease) in shareholders' equity
Net Income	181,461				181,461
Other Comprehensive Income (Loss)	(10,349)			(10,349)
Share-Based Compensation	6,786		6,786
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits	10,343	$ 1	2,801		(1,124)	8,665
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)		259,985
Common Stock Repurchased	(61,807)					(61,807)
Common Stock Repurchased (in shares)		(906,160)
Cash Dividends Declared	81,157				81,157
Balance at End of Period at Dec. 31, 2016	1,161,537	$ 576	551,628	(33,906)	1,415,440	(772,201)
Ending Balance (in shares) at Dec. 31, 2016		42,635,978
Increase (decrease) in shareholders' equity
Net Income	184,672				184,672
Other Comprehensive Income (Loss)	(809)			(809)
Share-Based Compensation	7,369		7,369
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits	13,241	$ 0	2,164		(828)	11,905
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)		337,091
Common Stock Repurchased	(47,076)					(47,076)
Common Stock Repurchased (in shares)		(571,626)
Cash Dividends Declared	87,066				87,066
Balance at End of Period at Dec. 31, 2017	$ 1,231,868	$ 576	561,161	(34,715)	1,512,218	(807,372)
Ending Balance (in shares) at Dec. 31, 2017	42,401,443	42,401,443
Increase (decrease) in shareholders' equity
Net Income	$ 219,602				219,602
Other Comprehensive Income (Loss)	(8,851)			(8,851)
Reclassification of the Income Tax Effect of the Tax Reform from AOCI to RE	0			(7,477)	7,477
Share-Based Compensation	8,146		8,146
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits	7,919	$ 1	2,397		513	5,008
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)		219,210
Common Stock Repurchased	$ (91,988)					(91,988)
Common Stock Repurchased (in shares)	(1,079,397)	(1,120,755)
Cash Dividends Declared	$ 98,496				98,496
Balance at End of Period at Dec. 31, 2018	$ 1,268,200	$ 577	$ 571,704	$ (51,043)	$ 1,641,314	$ (894,352)
Ending Balance (in shares) at Dec. 31, 2018	41,499,898	41,499,898

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Dividends Declared Per Share (in dollars per share)	$ 2.34	$ 2.04	$ 1.89

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net Income	$ 219,602	$ 184,672	$ 181,461
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	13,425	16,900	4,750
Depreciation and Amortization	14,389	13,048	12,871
Amortization of Deferred Loan and Lease Fees	(372)	(1,031)	(1,467)
Amortization and Accretion of Premiums/Discounts on Investment Securities, Net	32,966	39,186	43,728
Share-Based Compensation	8,146	7,369	6,786
Benefit Plan Contributions	(1,749)	(11,454)	(1,284)
Deferred Income Taxes	(6,274)	4,177	7,187
Net Gains (Losses) on Sale of Loans and Leases	(3,834)	(6,780)	(11,113)
Net Losses (Gains) on Investment Securities	3,938	(10,430)	(10,203)
Proceeds from Sales of Loans Held for Sale	275,943	323,784	273,597
Originations of Loans Held for Sale	(267,066)	(326,195)	(280,391)
Net Tax Benefits from Share-Based Compensation	(993)	(2,521)	0
Excess Tax Benefits from Share-Based Compensation	0	0	1,153
Net Change in Other Assets and Other Liabilities	27,815	(60,622)	1,760
Net Cash Provided by Operating Activities	317,922	175,145	226,529
Investment Securities Available-for-Sale:
Proceeds from Prepayments and Maturities	358,244	365,239	408,835
Purchases	(166,915)	(427,061)	(367,346)
Investment Securities Held-to-Maturity:
Proceeds from Prepayments and Maturities	853,635	882,748	806,339
Purchases	(419,640)	(995,076)	(677,652)
Net Change in Loans and Leases	(664,692)	(954,984)	(1,263,749)
Proceeds from Sale of Loans and Leases Held-for-investment	0	137,717	147,898
Premises and Equipment, Net	(35,300)	(30,470)	(15,177)
Net Cash Provided by (Used in) Investing Activities	(74,668)	(1,021,887)	(960,852)
Financing Activities
Net Change in Deposits	143,273	563,728	1,069,137
Net Change in Short-Term Borrowings	(798)	(27,701)	(103,196)
Proceeds from Long-Term Debt	50,000	0	75,000
Repayments of Other Debt	(175,000)	0	(50,000)
Tax Benefits from Share-Based Compensation	0	0	1,153
Proceeds from Issuance of Common Stock	7,873	13,101	9,079
Repurchase of Common Stock	(91,988)	(47,076)	(61,807)
Cash Dividends Paid	(98,496)	(87,066)	(81,157)
Net Cash Provided by (Used in) Financing Activities	(165,136)	414,986	858,209
Net Change in Cash and Cash Equivalents	78,118	(431,756)	123,886
Cash and Cash Equivalents at End of Period	525,969	447,851	879,607
Cash and Cash Equivalents at Beginning of Period	447,851	879,607	755,721
Supplemental Information
Cash Paid for Interest	62,515	44,945	39,482
Cash Paid for Income Taxes	42,475	67,883	57,005
Non-Cash Investing and Financing Activities:
Transfer from Loans to Foreclosed Real Estate	2,693	2,559	1,058
Transfer of Portfolio Loans and Leases to Held-for-sale	$ 0	$ 86,625	$ 189,972

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation Bank of Hawaii Corporation (the “Parent”) is a Delaware corporation and a bank holding company headquartered in Honolulu, Hawaii. Bank of Hawaii Corporation and its subsidiaries (collectively, the “Company”) provide a broad range of financial products and services to customers in Hawaii, Guam, and other Pacific Islands. The majority of the Company’s operations consist of customary commercial and consumer banking services including, but not limited to, lending, leasing, deposit services, trust and investment activities, brokerage services, and trade financing. The accounting and reporting principles of the Company conform to U.S. generally accepted accounting principles (“GAAP”) and prevailing practices within the financial services industry. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Actual results may differ from those estimates and such differences could be material to the financial statements. Certain prior period information has been reclassified to conform to the current year presentation. The following is a summary of the Company’s significant accounting policies: Consolidation The accompanying consolidated financial statements include the accounts of the Parent and its subsidiaries. The Parent’s principal operating subsidiary is Bank of Hawaii (the “Bank”). All significant intercompany accounts and transactions have been eliminated in consolidation. Variable Interest Entities Variable interests are defined as contractual ownership or other interests in an entity that change with fluctuations in an entity’s net asset value. The primary beneficiary consolidates the variable interest entity (“VIE”). The primary beneficiary is defined as the enterprise that has both the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and the obligation to absorb losses or the right to receive benefits that could be significant to the VIE. The Company has limited partnership interests in several low-income housing partnerships. These partnerships provide funds for the construction and operation of apartment complexes that provide affordable housing to lower-income households. If these developments successfully attract a specified percentage of residents falling in that lower income range, state and/or federal income tax credits are made available to the partners. The tax credits are generally recognized over 10 years. In order to continue receiving the tax credits each year over the life of the partnership, the low-income residency targets must be maintained. Prior to January 1, 2015, the Company utilized the effective yield method whereby the Company recognized tax credits generally over 10 years and amortized the initial cost of the investment to provide a constant effective yield over the period that tax credits are allocated to the Company. On January 1, 2015, the Company adopted Accounting Standards Update (“ASU”) No. 2014-01, “Accounting for Investments in Qualified Affordable Housing Projects” prospectively for new investments. ASU No. 2014-01 permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. As permitted by ASU No. 2014-01, the Company elected to continue to utilize the effective yield method for investments made prior to January 1, 2015. Unfunded commitments to fund these low-income housing partnerships were $15.2 million and $17.5 million as of December 31, 2018 and 2017 , respectively. These unfunded commitments are unconditional and legally binding and are recorded in other liabilities in the consolidated statements of condition. See Note 18 Affordable Housing Projects Tax Credit Partnerships for more information. The Company also has limited partnership interests in solar energy tax credit partnership investments. These partnerships develop, build, own and operate solar renewable energy projects. Over the course of these investments, the Company expects to receive federal and state tax credits, tax-related benefits, and excess cash available for distribution, if any. The Company may be called to sell its interest in the limited partnerships through a call option once all investment tax credits have been recognized. Tax benefits associated with these investments are generally recognized over 6 years. These entities meet the definition of a VIE; however, the Company is not the primary beneficiary of the entities, as the general partner has both the power to direct the activities that most significantly impact the economic performance of the entities and the obligation to absorb losses or the right to receive benefits that could be significant to the entities. While the partnership agreements allow the limited partners, through a majority vote, to remove the general partner, this right is not deemed to be substantive as the general partner can only be removed for cause. The investments in these entities are initially recorded at cost, which approximates the maximum exposure to loss as a result of the Company’s involvement with these unconsolidated entities. The balance of the Company’s investments in these entities was $85.9 million and $87.6 million as of December 31, 2018 and 2017 , respectively, and is included in other assets in the consolidated statements of condition. Investment Securities Investment securities are accounted for according to their purpose and holding period. Trading securities are those that are bought and held principally for the purpose of selling them in the near term. The Company held no trading securities as of December 31, 2018 and 2017 . Available-for-sale investment securities, comprised of debt and mortgage-backed securities, are those that may be sold before maturity due to changes in the Company’s interest rate risk profile or funding needs, and are reported at fair value with unrealized gains and losses, net of taxes, reported as a component of other comprehensive income. Held-to-maturity investment securities, comprised of debt and mortgage-backed securities, are those that management has the positive intent and ability to hold to maturity and are reported at amortized cost. Realized gains and losses are recorded in noninterest income and are determined on a trade date basis using the specific identification method. Interest and dividends on investment securities are recognized in interest income on an accrual basis. Premiums and discounts are amortized or accreted into interest income using the interest method over the expected lives of the individual securities. Transfers of debt securities from the available-for-sale category to the held-to-maturity category are made at fair value at the date of transfer. The unrealized holding gain or loss at the date of transfer remains in accumulated other comprehensive income and in the carrying value of the held-to-maturity investment security. Premiums or discounts on investment securities are amortized or accreted as an adjustment of yield using the interest method over the estimated life of the security. Unrealized holding gains or losses that remain in accumulated other comprehensive income are also amortized or accreted over the estimated life of the security as an adjustment of yield, offsetting the related amortization of the premium or accretion of the discount. Other-Than-Temporary-Impairments of Investment Securities The Company conducts an other-than-temporary-impairment (“OTTI”) analysis of investment securities on a quarterly basis or more often if a potential loss-triggering event occurs. A write-down of a debt security is recorded when fair value is below amortized cost in circumstances where: (1) the Company has the intent to sell a security; (2) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis; or (3) the Company does not expect to recover the entire amortized cost basis of the security. If the Company intends to sell a security or if it is more likely than not that the Company will be required to sell the security before recovery, an OTTI write-down is recognized in earnings equal to the entire difference between the security’s amortized cost basis and its fair value. If the Company does not intend to sell the security or it is not more likely than not that it will be required to sell the security before recovery, the OTTI write-down is separated into an amount representing credit loss, which is recognized in earnings, and an amount related to all other factors, which is recognized in other comprehensive income. To determine the amount related to credit loss on a debt security, the Company applies a methodology similar to that used for evaluating the impairment of loans. As of December 31, 2018 , management determined that the Company did not own any investment securities that were other-than-temporarily-impaired. Loans Held for Sale Residential mortgage loans with the intent to be sold in the secondary market are accounted for on an aggregate basis under the fair value option. Fair value is primarily determined based on quoted prices for similar loans in active markets. Non-refundable fees and direct loan origination costs related to residential mortgage loans held for sale are recognized as part of the cost basis of the loan at the time of sale. Gains and losses on sales of residential mortgage loans (sales proceeds minus carrying value) are recorded in the mortgage banking component of noninterest income. Commercial loans that management has an active plan to sell are valued on an individual basis at the lower-of-cost-or fair value. Fair value is primarily determined based on quoted prices for similar loans in active markets or agreed upon sales prices. Any reduction in the loan’s value, prior to being transferred to the held-for-sale category, is reflected as a charge-off of the recorded investment in the loan resulting in a new cost basis, with a corresponding reduction in the allowance for loan and lease losses. Further decreases in the fair value of the loan are recognized in noninterest expense. Loans and Leases Loans are reported at the principal amount outstanding, net of unearned income including unamortized deferred loan fees and costs, and cumulative net charge-offs. Interest income is recognized on an accrual basis. Loan origination fees, certain direct costs, and unearned discounts and premiums, if any, are deferred and are generally amortized into interest income as yield adjustments using the interest method over the contractual life of the loan. Loan commitment fees are generally recognized into noninterest income. Other credit-related fees are recognized as fee income, a component of noninterest income, when earned. Direct financing leases are carried at the aggregate of lease payments receivable plus the estimated residual value of leased property, less unearned income. Leveraged leases, which are a form of direct financing leases, are carried net of non-recourse debt. Unearned income on direct financing and leveraged leases is amortized over the lease term by methods that approximate the interest method. Residual values on leased assets are periodically reviewed for impairment. Portfolio segments are defined as the level at which an entity develops and documents a systematic methodology to determine its allowance for loan and lease losses (the “Allowance”). Management has determined that the Company has two portfolio segments of loans and leases (commercial and consumer) in determining the Allowance. Both quantitative and qualitative factors are used by management at the portfolio segment level in determining the adequacy of the Allowance for the Company. Classes of loans and leases are a disaggregation of a Company’s portfolio segments. Classes are defined as a group of loans and leases which share similar initial measurement attributes, risk characteristics, and methods for monitoring and assessing credit risk. Management has determined that the Company has seven classes of loans and leases (commercial and industrial, commercial mortgage, construction, lease financing, residential mortgage, home equity, automobile, and other). The “other” class of loans and leases is comprised of revolving credit, installment, and lease financing arrangements. Non-Performing Loans and Leases Generally, all classes of commercial loans and leases are placed on non-accrual status upon becoming contractually past due 90 days as to principal or interest (unless loans and leases are adequately secured by collateral, are in the process of collection, and are reasonably expected to result in repayment), when terms are renegotiated below market levels, or where substantial doubt about full repayment of principal or interest is evident. For residential mortgage and home equity loan classes, loans past due 120 days as to principal or interest may be placed on non-accrual status, and a partial charge-off may be recorded, depending on the collateral value and/or the collectability of the loan. For automobile and other consumer loan classes, the entire outstanding balance of the loan is charged off when the loan becomes 120 days past due as to principal or interest. When a loan or lease is placed on non-accrual status, the accrued and unpaid interest receivable is reversed and the loan or lease is accounted for on the cash or cost recovery method until qualifying for return to accrual status. All payments received on non-accrual loans and leases are applied against the principal balance of the loan or lease. A loan or lease may be returned to accrual status when all delinquent interest and principal become current in accordance with the terms of the loan or lease agreement and when doubt about repayment is resolved. Generally, for all classes of loans and leases, a charge-off is recorded when it is probable that a loss has been incurred and when it is possible to determine a reasonable estimate of the loss. For all classes of commercial loans and leases, a charge-off is determined on a judgmental basis after due consideration of the debtor’s prospects for repayment and the fair value of collateral. For the pooled segment of the Company’s commercial and industrial loan class, which consists of small business loans, the entire outstanding balance of the loan remains on accrual status until it is charged off during the month that the loan becomes 120 days past due as to principal or interest. As previously mentioned, for residential mortgage and home equity loan classes, a partial charge-off may be recorded at 120 days past due as to principal or interest depending on the collateral value and/or the collectability of the loan. In the event that a loan or line in the home equity loan class is behind another financial institution’s first mortgage, the entire outstanding balance of the loan is charged off when the loan becomes 120 days past due as to principal or interest, unless the combined loan-to-value ratio is 60% or less. As noted above, loans in the automobile and other consumer loan classes are charged off in its entirety upon the loan becoming 120 days past due as to principal or interest. Impaired Loans A loan is considered impaired when, based on current information and events, it is probable that the Company will not be able to collect all amounts due from the borrower in accordance with the contractual terms of the loan, including scheduled interest payments. Impaired loans include all classes of commercial non-accruing loans (except lease financing and small business loans), and all loans modified in a troubled debt restructuring. Impaired loans exclude lease financing and smaller balance homogeneous loans (consumer and small business non-accruing loans) that are collectively evaluated for impairment. For all classes of commercial loans, a quarterly evaluation of individual commercial borrowers is performed to identify impaired loans. The identification of specific borrowers for review is based on a review of non-accrual loans as well as those loans specifically identified by management as exhibiting above average levels of risk. When a loan has been identified as being impaired, the amount of impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the estimated fair value of the collateral, less any selling costs, if the loan is collateral-dependent. If the measurement of the impaired loan is less than the recorded investment in the loan (including accrued interest, net of deferred loan fees or costs, and unamortized premiums or discounts), impairment is recognized by establishing or adjusting an existing allocation of the Allowance, or by recording a partial charge-off of the loan to its fair value. Interest payments made on impaired loans are typically applied to principal unless collectability of the principal amount is reasonably assured, in which case interest income may be accrued or recognized on a cash basis. Loans Modified in a Troubled Debt Restructuring Loans are considered to have been modified in a troubled debt restructuring when, due to a borrower’s financial difficulties, the Company makes certain concessions to the borrower that it would not otherwise consider. Modifications may include interest rate reductions, principal or interest forgiveness, forbearance, and other actions intended to minimize economic loss and to avoid foreclosure or repossession of collateral. Generally, a non-accrual loan that has been modified in a troubled debt restructuring remains on non-accrual status for a period of at least 6 months to demonstrate that the borrower is able to meet the terms of the modified loan. 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, the loan remains on non-accrual status. Reserve for Credit Losses The Company’s reserve for credit losses is comprised of two components, the Allowance and the reserve for unfunded commitments (the “Unfunded Reserve”). Allowance for Loan and Lease Losses The Company maintains an Allowance adequate to cover management’s estimate of probable credit losses as of the balance sheet date. Loans and leases that are charged off reduce the Allowance while recoveries of loans and leases previously charged off increase the Allowance. Other changes to the level of the Allowance are recognized through charges or credits to the provision for credit losses (the “Provision”). The Allowance considers both unimpaired and impaired loans and is developed and documented at the portfolio segment level (commercial and consumer). The level of the Allowance related to the Company’s commercial portfolio segment is generally based on the credit risk ratings and historical loss experience of individual borrowers. This is supplemented as necessary by credit judgment to address observed changes in trends and conditions, and other relevant environmental and economic factors that may affect the collectability of loans and leases. Excluding those loans and leases evaluated individually for impairment, the Company’s remaining commercial loans and leases are pooled and collectively evaluated for impairment based on business unit and internal risk rating segmentation. The level of the Allowance related to the Company’s consumer portfolio segment is generally based on analyses of homogeneous pools of loans and leases. Loans and leases are pooled based on similar loan and lease risk characteristics for collective evaluation of impairment. Loss estimates are calculated based on historical rolling average loss rates and average delinquency flows to loss. Consumer loans that have been individually evaluated for impairment or modified in a troubled debt restructuring are excluded from the homogeneous pools. Impairment related to such loans is generally determined based on the present value of expected future cash flows discounted at the loan’s original effective interest rate. The Allowance also includes an estimate for inherent losses not reflected in the historical analyses. Relevant factors include, but are not limited to, concentrations of credit risk (geographic, large borrower, and industry), economic trends and conditions, changes in underwriting standards, experience and depth of lending staff, trends in delinquencies, and the level of net charge-offs. In addition, the Company uses a variety of other tools to estimate probable credit losses including, but not limited to, a rolling quarterly forecast of asset quality metrics; stress testing; and performance indicators based on the Company’s own experience, peers, or other industry sources. Reserve for Unfunded Commitments The Unfunded Reserve is a component of other liabilities and represents the estimate for probable credit losses inherent in unfunded commitments to extend credit. Unfunded commitments to extend credit include banker’s acceptances, and standby and commercial letters of credit. The process used to determine the Unfunded Reserve is consistent with the process for determining the Allowance, as adjusted for estimated funding probabilities or loan and lease equivalency factors. The level of the Unfunded Reserve is adjusted by recording an expense or recovery in other noninterest expense. Cash and Cash Equivalents Cash and cash equivalents include cash and due from banks, interest-bearing deposits in other banks, and funds sold. All amounts are readily convertible to cash and have maturities of less than 90 days. Premises and Equipment Premises and equipment, including leasehold improvements, are stated at cost, less accumulated depreciation and amortization. Capital leases are included in premises and equipment at the capitalized amount less accumulated amortization. Premises and equipment are depreciated using the straight-line method over the estimated useful lives of the respective assets. Estimated useful lives generally range up to 30 years for buildings and up to 10 years for equipment. Capitalized leased assets and leasehold improvements are amortized over the shorter of the estimated useful life of the asset or the lease term. Repairs and maintenance are charged to expense as incurred, while improvements which extend the estimated useful life of the asset are capitalized and depreciated over the estimated remaining life of the asset. Premises and equipment are periodically evaluated for impairment when events or changes in circumstances indicate the carrying amount may not be recoverable. Impairment exists when the expected undiscounted future cash flows of premises and equipment are less than its carrying amount. In that event, the Company records a loss for the difference between the carrying amount and the fair value of the asset based on quoted market prices, if applicable, or a discounted cash flow analysis. Foreclosed Real Estate Foreclosed real estate consists of properties acquired through foreclosure proceedings or acceptance of a deed-in-lieu of foreclosure. These properties are recorded at fair value less estimated costs to sell the property. If the recorded investment in the loan exceeds the property’s fair value at the time of acquisition, a charge-off is recorded against the Allowance. If the fair value of the property at the time of acquisition exceeds the carrying amount of the loan, the excess is recorded either as a recovery to the Allowance if a charge-off had previously been recorded, or as a gain on initial transfer in other noninterest income. Subsequent decreases in the property’s fair value and operating expenses of the property are recognized through charges to other noninterest expense. The fair value of the property acquired is based on third party appraisals, broker price opinions, recent sales activity, or a combination thereof, subject to management judgment. Mortgage Servicing Rights Mortgage servicing rights are recognized as assets when mortgage loans are sold and the rights to service those loans are retained. Mortgage servicing rights are initially recorded at fair value by using a discounted cash flow model to calculate the present value of estimated future net servicing income. The Company’s mortgage servicing rights accounted for under the fair value method are carried on the statements of condition at fair value with changes in fair value recorded in mortgage banking income in the period in which the change occurs. Changes in the fair value of mortgage servicing rights are primarily due to changes in valuation inputs, assumptions, and the collection and realization of expected cash flows. The Company’s mortgage servicing rights accounted for under the amortization method are initially recorded at fair value. However, these mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income. An impairment analysis is prepared on a quarterly basis by estimating the fair value of the mortgage servicing rights and comparing that value to the carrying amount. A valuation allowance is established when the carrying amount of these mortgage servicing rights exceeds fair value. 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. Goodwill impairment testing is performed at the reporting unit level, equivalent to a business segment or one level below. The Company has goodwill assigned to the following reporting units: Investment Services and Retail Banking. The Company performs its annual evaluation of goodwill impairment in the fourth quarter of each year and on an interim basis if events or changes in circumstances indicate that there may be impairment. The Company performs a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. The qualitative factors considered include, but are not limited to, macroeconomic and State of Hawaii economic conditions, industry and market conditions and trends, the Company’s financial performance, market capitalization, stock price, and any Company-specific events relevant to the assessment. If the assessment of qualitative factors indicates that it is not more likely than not that an impairment exists, no further testing is performed; otherwise an impairment test is performed. Prior to 2017, the goodwill impairment test was a two-step test. The first step compared the estimated fair value of identified reporting units with their carrying amount, including goodwill. If the estimated fair value of a reporting unit was less than the carrying value, the second step was required to determine the implied fair value of the reporting unit’s goodwill and the amount of goodwill impairment, if any. In 2017, the Company elected to early adopt ASU No. 2017-04, “Simplifying the Test for Goodwill Impairment.” The guidance removed Step 2 of the goodwill impairment test. Goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance remained largely unchanged. Subsequent reversals of goodwill impairment are prohibited. For the year ended December 31, 2018 , the Company’s goodwill impairment evaluation, based on its qualitative assessment, indicated there was no impairment. Non-Marketable Equity Securities The Company is required to own Federal Home Loan Bank (“FHLB”) of Des Moines and Federal Reserve Bank (“FRB”) stock as a condition of membership. These non-marketable equity securities are accounted for at cost which equals par or redemption value. These securities do not have a readily determinable fair value as their ownership is restricted and there is no market for these securities. These securities can only be redeemed or sold at their par value and only to the respective issuing government supported institution or to another member institution. The Company records these non-marketable equity securities as a component of other assets, which are periodically evaluated for impairment. Management considers these non-marketable equity securities to be long-term investments. Accordingly, when evaluating these securities for impairment, management considers the ultimate recoverability of the par value rather than by recognizing temporary declines in value. Bank-Owned Life Insurance The Company purchases life insurance policies on the lives of certain officers and employees and is the owner and beneficiary of the policies. The Company invests in these Bank-Owned Life Insurance (“BOLI”) policies to provide an efficient form of funding for long-term retirement and other employee benefits costs. The Company records these BOLI policies in the consolidated statements of condition at cash surrender value, with changes recorded in noninterest income in the consolidated statements of income. Securities Sold Under Agreements to Repurchase The Company enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Company may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Company to repurchase the assets. As a result, securities sold under agreements to repurchase are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities. The obligation to repurchase the securities is reflected as a liability in the Company’s consolidated statements of condition, while the securities underlying the securities sold under agreements to repurchase remain in the respective asset accounts. See Note 19 Balance Sheet Offsetting for more information. Pension and Postretirement Benefit Plans The Company incurs certain employment-related expenses associated with its two frozen pension plans and a postretirement benefit plan (the “Plans”). In order to measure the expense associated with the Plans, various assumptions are made including the discount rate, expected return on plan assets, anticipated mortality rates, and expected future healthcare costs. The assumptions are based on historical experience as well as current facts and circumstances. The Company uses a December 31 measurement date for its Plans. As of the measurement date, plan assets are determined based on fair value, generally representing observable market prices. The projected benefit obligation is primarily determined based on the present value of projected benefit distributions at an assumed discount rate. Net periodic pension benefit costs include interest costs based on an assumed discount rate, the expected return on plan assets based on actuarially derived market-related values, and the amortization of net actuarial gains or losses. Net periodic postretirement benefit costs include service costs, interest costs based on an assumed discount rate, and the amortization of prior service credits and net actuarial gains or losses. Differences between expected and actual results in each year are included in the net actuarial gain or loss amount, which is recognized in other comprehensive income. The net actuarial gain or loss in excess of a 10% corridor is amortized in net periodic benefit cost over the average remaining expected lives of the pension plan participants and over the average remaining future service years of the postretirement benefit plan participants. The prior service credit is amortized over the average remaining service period to full eligibility for participating employees expected to receive benefits. The Company recognizes in its consolidated statements of condition an asset for a plan’s overfunded status or a liability for a plan’s underfunded status. The Company also measures the Plans’ assets and obligations that determine its funded status as of the end of the year and recognizes those changes in other comprehensive income

Restrictions on Cash and Cash a

Restrictions on Cash and Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Restrictions on Cash and Cash and Cash Equivalents	The Company is required to maintain cash on hand or on deposit with the Federal Reserve Bank based on the amount of certain customer deposits, mainly checking accounts. The Bank’s average required reserve balances were $72.3 million and $73.2 million as of December 31, 2018 and 2017 , respectively. The following table provides a reconciliation of cash and cash equivalents reported within the consolidated statements of condition that sum to the total of the same such amounts shown in the consolidated statements of cash flows: (dollars in thousands) December 31, December 31, Interest-Bearing Deposits in Other Banks $ 3,028 $ 3,421 Funds Sold 198,860 181,413 Cash and Due From Banks 324,081 263,017 Total Cash and Cash Equivalents $ 525,969 $ 447,851

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	The amortized cost, gross unrealized gains and losses, and fair value of the Company’s investment securities as of December 31, 2018 , 2017 , and 2016 were as follows: (dollars in thousands) Amortized Gross Gross Fair December 31, 2018 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 394,485 $ 493 $ (2,577 ) $ 392,401 Debt Securities Issued by States and Political Subdivisions 559,800 5,227 (1,031 ) 563,996 Debt Securities Issued by U.S. Government-Sponsored Enterprises 56 — — 56 Debt Securities Issued by Corporations 224,997 — (1,857 ) 223,140 Mortgage-Backed Securities: Residential - Government Agencies 189,645 1,726 (929 ) 190,442 Residential - U.S. Government-Sponsored Enterprises 589,311 1,779 (12,563 ) 578,527 Commercial - Government Agencies 63,864 — (4,484 ) 59,380 Total Mortgage-Backed Securities 842,820 3,505 (17,976 ) 828,349 Total $ 2,022,158 $ 9,225 $ (23,441 ) $ 2,007,942 Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 353,122 $ 186 $ (1,093 ) $ 352,215 Debt Securities Issued by States and Political Subdivisions 234,602 6,150 — 240,752 Debt Securities Issued by Corporations 97,266 — (1,755 ) 95,511 Mortgage-Backed Securities: Residential - Government Agencies 1,861,874 3,886 (51,773 ) 1,813,987 Residential - U.S. Government-Sponsored Enterprises 758,835 1,590 (20,259 ) 740,166 Commercial - Government Agencies 176,393 147 (5,177 ) 171,363 Total Mortgage-Backed Securities 2,797,102 5,623 (77,209 ) 2,725,516 Total $ 3,482,092 $ 11,959 $ (80,057 ) $ 3,413,994 December 31, 2017 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 424,912 $ 2,053 $ (1,035 ) $ 425,930 Debt Securities Issued by States and Political Subdivisions 618,167 9,894 (1,042 ) 627,019 Debt Securities Issued by Corporations 268,003 199 (2,091 ) 266,111 Mortgage-Backed Securities: Residential - Government Agencies 233,268 3,129 (1,037 ) 235,360 Residential - U.S. Government-Sponsored Enterprises 619,795 420 (10,403 ) 609,812 Commercial - Government Agencies 71,999 — (3,252 ) 68,747 Total Mortgage-Backed Securities 925,062 3,549 (14,692 ) 913,919 Total $ 2,236,144 $ 15,695 $ (18,860 ) $ 2,232,979 Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 375,074 $ 18 $ (1,451 ) $ 373,641 Debt Securities Issued by States and Political Subdivisions 238,504 9,125 — 247,629 Debt Securities Issued by Corporations 119,635 123 (1,591 ) 118,167 Mortgage-Backed Securities: Residential - Government Agencies 2,229,985 9,975 (37,047 ) 2,202,913 Residential - U.S. Government-Sponsored Enterprises 763,312 911 (11,255 ) 752,968 Commercial - Government Agencies 201,660 797 (3,654 ) 198,803 Total Mortgage-Backed Securities 3,194,957 11,683 (51,956 ) 3,154,684 Total $ 3,928,170 $ 20,949 $ (54,998 ) $ 3,894,121 December 31, 2016 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 407,478 $ 2,531 $ (1,294 ) $ 408,715 Debt Securities Issued by States and Political Subdivisions 662,231 11,455 (1,887 ) 671,799 Debt Securities Issued by Corporations 273,044 5 (3,870 ) 269,179 Mortgage-Backed Securities: Residential - Government Agencies 240,412 4,577 (1,145 ) 243,844 Residential - U.S. Government-Sponsored Enterprises 511,234 971 (5,218 ) 506,987 Commercial - Government Agencies 89,544 — (4,027 ) 85,517 Total Mortgage-Backed Securities 841,190 5,548 (10,390 ) 836,348 Total $ 2,183,943 $ 19,539 $ (17,441 ) $ 2,186,041 Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 530,149 $ 1,562 $ (771 ) $ 530,940 Debt Securities Issued by States and Political Subdivisions 242,295 9,991 — 252,286 Debt Securities Issued by Corporations 135,620 416 (1,528 ) 134,508 Mortgage-Backed Securities: Residential - Government Agencies 1,940,076 20,567 (23,861 ) 1,936,782 Residential - U.S. Government-Sponsored Enterprises 752,768 798 (10,919 ) 742,647 Commercial - Government Agencies 232,089 940 (2,665 ) 230,364 Total Mortgage-Backed Securities 2,924,933 22,305 (37,445 ) 2,909,793 Total $ 3,832,997 $ 34,274 $ (39,744 ) $ 3,827,527 The table below presents an analysis of the contractual maturities of the Company’s investment securities as of December 31, 2018 . Debt securities issued by government agencies (Small Business Administration securities) and mortgage-backed securities are disclosed separately in the table below as these investment securities may prepay prior to their scheduled contractual maturity dates. (dollars in thousands) Amortized Fair Value Available-for-Sale: Due in One Year or Less $ 57,119 $ 57,094 Due After One Year Through Five Years 613,577 613,408 Due After Five Years Through Ten Years 92,306 94,126 Due After Ten Years 22,830 23,536 785,832 788,164 Debt Securities Issued by Government Agencies 393,506 391,429 Mortgage-Backed Securities: Residential - Government Agencies 189,645 190,442 Residential - U.S. Government-Sponsored Enterprises 589,311 578,527 Commercial - Government Agencies 63,864 59,380 Total Mortgage-Backed Securities 842,820 828,349 Total $ 2,022,158 $ 2,007,942 Held-to-Maturity: Due in One Year or Less $ 164,868 $ 164,518 Due After One Year Through Five Years 311,016 312,837 Due After Five Years Through Ten Years 201,389 203,010 Due After Ten Years 7,717 8,113 684,990 688,478 Mortgage-Backed Securities: Residential - Government Agencies 1,861,874 1,813,987 Residential - U.S. Government-Sponsored Enterprises 758,835 740,166 Commercial - Government Agencies 176,393 171,363 Total Mortgage-Backed Securities 2,797,102 2,725,516 Total $ 3,482,092 $ 3,413,994 Investment securities with carrying values of $2.3 billion as of December 31, 2018 , and $2.4 billion as of December 31, 2017 and 2016 , were pledged to secure deposits of governmental entities and securities sold under agreements to repurchase. The table below presents the gains and losses from the sales of investment securities for the years ended December 31, 2018 , 2017 , and 2016 . (dollars in thousands) 2018 2017 2016 Gross Gains on Sales of Investment Securities $ — $ 12,467 $ 11,180 Gross Losses on Sales of Investment Securities (3,938 ) (2,037 ) (977 ) Net Gains (Losses) on Sales of Investment Securities $ (3,938 ) $ 10,430 $ 10,203 The losses during the year ended December 31, 2018 , 2017 , and 2016 were due to fees paid to the counterparties of the Company’s prior Visa Class B share sale transactions which are expensed as incurred. In addition, losses during the year ended December 31, 2018 included $1.0 million related to a change in the Visa Class B conversion ratio. The income tax expense related to the Company’s net realized gains (losses) on the sales of investment securities was $(1.0) million in 2018 , $4.1 million in 2017 and $4.0 million in 2016 . The Company’s investment securities in an unrealized loss position, segregated by continuous length of impairment, were as follows: Less Than 12 Months 12 Months or Longer Total (dollars in thousands) Fair Value Gross Fair Value Gross Fair Value Gross December 31, 2018 Available-for-Sales: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 157,058 $ (964 ) $ 173,763 $ (1,613 ) $ 330,821 $ (2,577 ) Debt Securities Issued by States and Political Subdivisions 38,138 (59 ) 156,772 (972 ) 194,910 (1,031 ) Debt Securities Issued by Corporations 59,770 (231 ) 163,371 (1,626 ) 223,141 (1,857 ) Mortgage-Backed Securities: Residential - Government Agencies 6,299 (10 ) 19,011 (919 ) 25,310 (929 ) Residential - U.S. Government-Sponsored Enterprises — — 473,380 (12,563 ) 473,380 (12,563 ) Commercial - Government Agencies — — 59,380 (4,484 ) 59,380 (4,484 ) Total Mortgage-Backed Securities 6,299 (10 ) 551,771 (17,966 ) 558,070 (17,976 ) Total $ 261,265 $ (1,264 ) $ 1,045,677 $ (22,177 ) $ 1,306,942 $ (23,441 ) Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 99,440 $ (237 ) $ 134,239 $ (856 ) $ 233,679 $ (1,093 ) Debt Securities Issued by Corporations — — 95,511 (1,755 ) 95,511 (1,755 ) Mortgage-Backed Securities: Residential - Government Agencies 12,974 (45 ) 1,491,747 (51,728 ) 1,504,721 (51,773 ) Residential - U.S. Government-Sponsored Enterprises — — 617,000 (20,259 ) 617,000 (20,259 ) Commercial - Government Agencies 19,217 (61 ) 145,715 (5,116 ) 164,932 (5,177 ) Total Mortgage-Backed Securities 32,191 (106 ) 2,254,462 (77,103 ) 2,286,653 (77,209 ) Total $ 131,631 $ (343 ) $ 2,484,212 $ (79,714 ) $ 2,615,843 $ (80,057 ) December 31, 2017 Available-for-Sales: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 103,842 $ (599 ) $ 132,071 $ (436 ) $ 235,913 $ (1,035 ) Debt Securities Issued by States and Political Subdivisions 172,343 (1,032 ) 734 (10 ) 173,077 (1,042 ) Debt Securities Issued by Corporations 12,985 (15 ) 192,927 (2,076 ) 205,912 (2,091 ) Mortgage-Backed Securities: Residential - Government Agencies 11,035 (4 ) 10,618 (1,033 ) 21,653 (1,037 ) Residential - U.S. Government-Sponsored Enterprises 429,342 (5,720 ) 150,887 (4,683 ) 580,229 (10,403 ) Commercial - Government Agencies — — 68,747 (3,252 ) 68,747 (3,252 ) Total Mortgage-Backed Securities 440,377 (5,724 ) 230,252 (8,968 ) 670,629 (14,692 ) Total $ 729,547 $ (7,370 ) $ 555,984 $ (11,490 ) $ 1,285,531 $ (18,860 ) Held-to-Maturity: Debt Securities Issued by the U.S. Treasury $ 254,283 $ (532 ) $ 89,391 $ (919 ) $ 343,674 $ (1,451 ) Debt Securities Issued by Corporations 25,490 (110 ) 58,869 (1,481 ) 84,359 (1,591 ) Mortgage-Backed Securities: Residential - Government Agencies 1,030,472 (12,262 ) 704,545 (24,785 ) 1,735,017 (37,047 ) Residential - U.S. Government-Sponsored Enterprises 293,530 (3,106 ) 339,232 (8,149 ) 632,762 (11,255 ) Commercial - Government Agencies 497 (5 ) 82,288 (3,649 ) 82,785 (3,654 ) Total Mortgage-Backed Securities 1,324,499 (15,373 ) 1,126,065 (36,583 ) 2,450,564 (51,956 ) Total $ 1,604,272 $ (16,015 ) $ 1,274,325 $ (38,983 ) $ 2,878,597 $ (54,998 ) The Company does not believe that the investment securities that were in an unrealized loss position as of December 31, 2018 , which were comprised of 464 securities, represent an other-than-temporary impairment. Total gross unrealized losses were primarily attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities. As of December 31, 2018 , the gross unrealized losses reported for mortgage-backed securities were mostly related to investment securities issued by the Government National Mortgage Association. The Company does not intend to sell the investment securities that were in an unrealized loss position and it is not more likely than not that the Company will be required to sell the investment securities before recovery of their amortized cost bases, which may be at maturity. Interest income from taxable and non-taxable investment securities for the years ended December 31, 2018 , 2017 , and 2016 were as follows: Year Ended December 31, (dollars in thousands) 2018 2017 2016 Taxable $ 115,947 $ 108,787 $ 100,541 Non-Taxable 18,515 19,725 20,438 Total Interest Income from Investment Securities $ 134,462 $ 128,512 $ 120,979 As of December 31, 2018 , included in the Company’s investment securities portfolio were debt securities issued by political subdivisions within the State of Hawaii of $451.1 million , representing 56% of the total fair value of the Company’s municipal debt securities. Of the entire Hawaii municipal bond portfolio, 96% were credit-rated Aa2 or better by Moody’s while the remaining Hawaii municipal bonds were credit-rated A1 or better by at least one nationally recognized statistical rating organization. Of the Company’s total Hawaii municipal bond holdings, 79% were general obligation issuances. As of December 31, 2018 , there were no other holdings of municipal debt securities that were issued by a single state or political subdivision which comprised more than 10% of the total fair value of the Company’s municipal debt securities. As of December 31, 2018 and 2017 , the carrying value of the Company’s Federal Home Loan Bank of Des Moines (“FHLB Des Moines”) stock and Federal Reserve Bank stock was as follows: December 31, (dollars in thousands) 2018 2017 Federal Home Loan Bank Stock $ 15,000 $ 20,000 Federal Reserve Bank Stock 20,858 20,645 Total $ 35,858 $ 40,645 These securities can only be redeemed or sold at their par value and only to the respective issuing government-supported institution or to another member institution. The Company records these non-marketable equity securities as a component of other assets and periodically evaluates these securities for impairment. Management considers these non-marketable equity securities to be long-term investments. Accordingly, when evaluating these securities for impairment, management considers the ultimate recoverability of the par value rather than by recognizing temporary declines in value. Visa Class B Restricted Shares In 2008, the Company received Visa Class B restricted shares as part of Visa’s initial public offering. These shares are transferable only under limited circumstances until they can be converted into the publicly traded Class A common shares. This conversion will not occur until the settlement of certain litigation which is indemnified by Visa members, including the Company. Visa funded an escrow account from its initial public offering to settle these litigation claims. Should this escrow account not be sufficient to cover these litigation claims, Visa is entitled to fund additional amounts to the escrow account by reducing each member bank’s Class B conversion ratio to unrestricted Class A shares. As of December 31, 2018 , the conversion ratio was 1.6298 . See Note 17 Derivative Financial Instruments for more information. The Company occasionally sells these Visa Class B shares to other financial institutions. Concurrent with every sale the Company enters into an agreement with the buyer that requires payment to the buyer in the event Visa further reduces the conversion ratio. Based on the existing transfer restriction and the uncertainty of the outcome of the Visa litigation mentioned above, the remaining 83,014 Class B shares ( 135,296 Class A equivalents) that the Company owns as of December 31, 2018 are carried at a zero cost basis.

Loans and Leases and the Allowa

Loans and Leases and the Allowance for Loan and Lease Losses	12 Months Ended
	Dec. 31, 2018
Loans and Leases and Allowance for Loan and Lease Losses [Abstract]
Loans and Leases and the Allowance for Loan and Lease Losses	Loans and Leases The Company’s loan and lease portfolio was comprised of the following as of December 31, 2018 and 2017 : December 31, (dollars in thousands) 2018 2017 Commercial Commercial and Industrial $ 1,331,149 $ 1,279,347 Commercial Mortgage 2,302,356 2,103,967 Construction 170,061 202,253 Lease Financing 176,226 180,931 Total Commercial 3,979,792 3,766,498 Consumer Residential Mortgage 3,673,796 3,466,773 Home Equity 1,681,442 1,585,455 Automobile 658,133 528,474 Other 1 455,611 449,747 Total Consumer 6,468,982 6,030,449 Total Loans and Leases $ 10,448,774 $ 9,796,947 1 Comprised of other revolving credit, installment, and lease financing. Total loans and leases were reported net of unearned income of $15.1 million and $20.2 million as of December 31, 2018 and 2017 , respectively. Commercial loans and residential mortgage loans of $1.0 billion were pledged to secure an undrawn FRB line of credit as of December 31, 2018 and 2017 . As of December 31, 2018 and 2017 , residential mortgage loans of $2.9 billion , were pledged under a blanket pledge arrangement to secure FHLB advances. See Note 10 Other Debt for FHLB advances outstanding as of December 31, 2018 and 2017 . Net gains related to sales of residential mortgage loans, recorded as a component of mortgage banking income, were $1.5 million , $4.9 million , and $11.8 million for the years ended December 31, 2018 , 2017 , and 2016 , respectively. Net gains on sales of commercial loans were not material for the years ended December 31, 2018 , 2017 , and 2016 . Substantially all of the Company’s lending activity is with customers located in Hawaii. A substantial portion of the Company’s real estate loans are secured by real estate in Hawaii. Allowance for Loan and Lease Losses The following presents by portfolio segment, the activity in the Allowance for the years ended December 31, 2018 , 2017 , and 2016 . The following also presents by portfolio segment, the balance in the Allowance disaggregated on the basis of the Company’s impairment measurement method and the related recorded investment in loans and leases as of December 31, 2018 , 2017 , and 2016 . (dollars in thousands) Commercial Consumer Total For the Year Ended December 31, 2018 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 65,822 $ 41,524 $ 107,346 Loans and Leases Charged-Off (1,505 ) (23,059 ) (24,564 ) Recoveries on Loans and Leases Previously Charged-Off 2,039 8,447 10,486 Net Loans and Leases Recovered (Charged-Off) 534 (14,612 ) (14,078 ) Provision for Credit Losses 518 12,907 13,425 Balance at End of Period $ 66,874 $ 39,819 $ 106,693 As of December 31, 2018 Allowance for Loan and Lease Losses: Individually Evaluated for Impairment $ 222 $ 3,754 $ 3,976 Collectively Evaluated for Impairment 66,652 36,065 102,717 Total $ 66,874 $ 39,819 $ 106,693 Recorded Investment in Loans and Leases: Individually Evaluated for Impairment $ 12,298 $ 42,327 $ 54,625 Collectively Evaluated for Impairment 3,967,494 6,426,655 10,394,149 Total $ 3,979,792 $ 6,468,982 $ 10,448,774 For the Year Ended December 31, 2017 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 65,680 $ 38,593 $ 104,273 Loans and Leases Charged-Off (1,408 ) (21,847 ) (23,255 ) Recoveries on Loans and Leases Previously Charged-Off 1,485 7,943 9,428 Net Loans and Leases Recovered (Charged-Off) 77 (13,904 ) (13,827 ) Provision for Credit Losses 65 16,835 16,900 Balance at End of Period $ 65,822 $ 41,524 $ 107,346 As of December 31, 2017 Allowance for Loan and Lease Losses: Individually Evaluated for Impairment $ 141 $ 3,775 $ 3,916 Collectively Evaluated for Impairment 65,681 37,749 103,430 Total $ 65,822 $ 41,524 $ 107,346 Recorded Investment in Loans and Leases: Individually Evaluated for Impairment $ 20,216 $ 41,002 $ 61,218 Collectively Evaluated for Impairment 3,746,282 5,989,447 9,735,729 Total $ 3,766,498 $ 6,030,449 $ 9,796,947 For the Year Ended December 31, 2016 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 60,714 $ 42,166 $ 102,880 Loans and Leases Charged-Off (865 ) (17,644 ) (18,509 ) Recoveries on Loans and Leases Previously Charged-Off 8,137 7,015 15,152 Net Loans and Leases Recovered (Charged-Off) 7,272 (10,629 ) (3,357 ) Provision for Credit Losses (2,306 ) 7,056 4,750 Balance at End of Period $ 65,680 $ 38,593 $ 104,273 As of December 31, 2016 Allowance for Loan and Lease Losses: Individually Evaluated for Impairment $ 45 $ 3,510 $ 3,555 Collectively Evaluated for Impairment 65,635 35,083 100,718 Total $ 65,680 $ 38,593 $ 104,273 Recorded Investment in Loans and Leases: Individually Evaluated for Impairment $ 21,572 $ 39,126 $ 60,698 Collectively Evaluated for Impairment 3,596,120 5,292,967 8,889,087 Total $ 3,617,692 $ 5,332,093 $ 8,949,785 Credit Quality Indicators The Company uses several credit quality indicators to manage credit risk in an ongoing manner. The Company uses an internal credit risk rating system that categorizes loans and leases into pass, special mention, or classified categories. Credit risk ratings are applied individually to those classes of loans and leases that have significant or unique credit characteristics that benefit from a case-by-case evaluation. These are typically loans and leases to businesses or individuals in the classes which comprise the commercial portfolio segment. Groups of loans and leases that are underwritten and structured using standardized criteria and characteristics, such as statistical models (e.g., credit scoring or payment performance), are typically risk-rated and monitored collectively. These are typically loans and leases to individuals in the classes which comprise the consumer portfolio segment. The following are the definitions of the Company’s credit quality indicators: Pass: Loans and leases in all classes within the commercial and consumer portfolio segments that are not adversely rated, are contractually current as to principal and interest, and are otherwise in compliance with the contractual terms of the loan or lease agreement. Management believes that there is a low likelihood of loss related to those loans and leases that are considered Pass. Special Mention: Loans and leases that have potential weaknesses that deserve management’s close attention. If not addressed, these potential weaknesses may result in deterioration of the repayment prospects for the loan or lease. Management believes that there is a moderate likelihood of some loss related to those loans and leases that are considered Special Mention. Classified: Loans and leases in the classes within the commercial portfolio segment that are inadequately protected by the sound worth and paying capacity of the borrower or of the collateral pledged, if any. Classified loans and leases are also those in the classes within the consumer portfolio segment that are past due 90 days or more as to principal or interest. Residential mortgage loans that are past due 90 days or more as to principal or interest may be considered pass if the Company is in the process of collection and the current loan-to-value ratio is 60% or less. Home equity loans that are past due 90 days or more as to principal or interest may be considered pass if the Company is in the process of collection, the first mortgage is with the Company, and the current combined loan-to-value ratio is 60% or less. Residential mortgage and home equity loans may be current as to principal and interest, but may be considered Classified for a period of up to six months following a loan modification. Following a period of demonstrated performance in accordance with the modified contractual terms, the loan may be removed from classified status. Management believes that there is a distinct possibility that the Company will sustain some loss if the deficiencies related to Classified loans and leases are not corrected in a timely manner. The Company’s credit quality indicators are periodically updated on a case-by-case basis. The following presents by class and by credit quality indicator, the recorded investment in the Company’s loans and leases as of December 31, 2018 and 2017 . December 31, 2018 (dollars in thousands) Commercial Commercial Construction Lease Total Pass $ 1,302,278 $ 2,256,128 $ 168,740 $ 175,223 $ 3,902,369 Special Mention 17,688 30,468 — 5 48,161 Classified 11,183 15,760 1,321 998 29,262 Total $ 1,331,149 $ 2,302,356 $ 170,061 $ 176,226 $ 3,979,792 (dollars in thousands) Residential Home Automobile Other 1 Total Pass $ 3,668,475 $ 1,677,193 657,620 $ 454,697 $ 6,457,985 Classified 5,321 4,249 513 914 10,997 Total $ 3,673,796 $ 1,681,442 $ 658,133 $ 455,611 $ 6,468,982 Total Recorded Investment in Loans and Leases $ 10,448,774 December 31, 2017 (dollars in thousands) Commercial Commercial Construction Lease Total Pass $ 1,234,738 $ 2,046,745 $ 198,926 $ 180,522 $ 3,660,931 Special Mention 15,394 35,762 6 11 51,173 Classified 29,215 21,460 3,321 398 54,394 Total $ 1,279,347 $ 2,103,967 $ 202,253 $ 180,931 $ 3,766,498 (dollars in thousands) Residential Home Automobile Other 1 Total Pass $ 3,457,531 $ 1,580,917 $ 527,587 $ 449,008 $ 6,015,043 Classified 9,242 4,538 887 739 15,406 Total $ 3,466,773 $ 1,585,455 $ 528,474 $ 449,747 $ 6,030,449 Total Recorded Investment in Loans and Leases $ 9,796,947 1 Comprised of other revolving credit, installment, and lease financing. Aging Analysis The following presents by class, an aging analysis of the Company’s loan and lease portfolio as of December 31, 2018 and 2017 . (dollars in thousands) 30 - 59 60 - 89 Past Due Non- Total Current Total Loans Non-Accrual 2 As of December 31, 2018 Commercial Commercial and Industrial $ 3,653 $ 118 $ 10 $ 542 $ 4,323 $ 1,326,826 $ 1,331,149 $ 515 Commercial Mortgage 561 — — 2,040 2,601 2,299,755 2,302,356 2,040 Construction — — — — — 170,061 170,061 — Lease Financing — — — — — 176,226 176,226 — Total Commercial 4,214 118 10 2,582 6,924 3,972,868 3,979,792 2,555 Consumer Residential Mortgage 5,319 638 2,446 5,321 13,724 3,660,072 3,673,796 1,203 Home Equity 3,323 1,581 2,684 3,671 11,259 1,670,183 1,681,442 765 Automobile 12,372 2,240 513 — 15,125 643,008 658,133 — Other 1 2,913 1,245 914 — 5,072 450,539 455,611 — Total Consumer 23,927 5,704 6,557 8,992 45,180 6,423,802 6,468,982 1,968 Total $ 28,141 $ 5,822 $ 6,567 $ 11,574 $ 52,104 $ 10,396,670 $ 10,448,774 $ 4,523 As of December 31, 2017 Commercial Commercial and Industrial $ 4,196 $ 641 $ — $ 448 $ 5,285 $ 1,274,062 $ 1,279,347 $ 313 Commercial Mortgage 187 404 — 1,398 1,989 2,101,978 2,103,967 465 Construction — — — — — 202,253 202,253 — Lease Financing — — — — — 180,931 180,931 — Total Commercial 4,383 1,045 — 1,846 7,274 3,759,224 3,766,498 778 Consumer Residential Mortgage 7,815 2,008 2,703 9,243 21,769 3,445,004 3,466,773 806 Home Equity 2,532 2,736 1,624 3,991 10,883 1,574,572 1,585,455 1,312 Automobile 11,728 2,232 886 — 14,846 513,628 528,474 — Other 1 3,007 1,639 1,934 — 6,580 443,167 449,747 — Total Consumer 25,082 8,615 7,147 13,234 54,078 5,976,371 6,030,449 2,118 Total $ 29,465 $ 9,660 $ 7,147 $ 15,080 $ 61,352 $ 9,735,595 $ 9,796,947 $ 2,896 1 Comprised of other revolving credit, installment, and lease financing. 2 Represents non-accrual loans that are not past due 30 days or more; however, full payment of principal and interest is still not expected. Impaired Loans The following presents by class, information related to impaired loans as of December 31, 2018 and 2017 . (dollars in thousands) Recorded Unpaid Related December 31, 2018 Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 4,587 $ 4,587 $ — Commercial Mortgage 2,712 6,212 — Construction 1,321 1,321 — Total Commercial 8,620 12,120 — Total Impaired Loans with No Related Allowance Recorded $ 8,620 $ 12,120 $ — Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 1,856 $ 2,099 $ 130 Commercial Mortgage 1,822 1,822 92 Total Commercial 3,678 3,921 222 Consumer Residential Mortgage 19,753 23,635 3,051 Home Equity 3,359 3,359 350 Automobile 17,117 17,117 296 Other 1 2,098 2,098 57 Total Consumer 42,327 46,209 3,754 Total Impaired Loans with an Allowance Recorded $ 46,005 $ 50,130 $ 3,976 Impaired Loans: Commercial $ 12,298 $ 16,041 $ 222 Consumer 42,327 46,209 3,754 Total Impaired Loans $ 54,625 $ 62,250 $ 3,976 December 31, 2017 Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 8,094 $ 15,747 $ — Commercial Mortgage 8,696 12,196 — Construction 1,415 1,415 — Total Commercial 18,205 29,358 — Total Impaired Loans with No Related Allowance Recorded $ 18,205 $ 29,358 $ — Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 811 $ 811 $ 21 Commercial Mortgage 1,200 1,200 120 Total Commercial 2,011 2,011 141 Consumer Residential Mortgage 21,581 26,324 3,118 Home Equity 1,965 1,965 276 Automobile 14,811 14,811 305 Other 1 2,645 2,645 76 Total Consumer 41,002 45,745 3,775 Total Impaired Loans with an Allowance Recorded $ 43,013 $ 47,756 $ 3,916 Impaired Loans: Commercial $ 20,216 $ 31,369 $ 141 Consumer 41,002 45,745 3,775 Total Impaired Loans $ 61,218 $ 77,114 $ 3,916 1 Comprised of other revolving credit and installment financing. The following presents by class, information related to the average recorded investment and interest income recognized on impaired loans for the years ended December 31, 2018 and 2017 . Year Ended Year Ended (dollars in thousands) Average Interest Average Interest Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 6,342 $ 310 $ 8,810 $ 351 Commercial Mortgage 4,642 160 9,251 299 Construction 1,360 69 1,464 94 Total Commercial 12,344 539 19,525 744 Total Impaired Loans with No Related Allowance Recorded $ 12,344 $ 539 $ 19,525 $ 744 Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 1,475 $ 100 $ 709 $ 42 Commercial Mortgage 623 25 690 54 Total Commercial 2,098 125 1,399 96 Consumer Residential Mortgage 20,324 1,080 22,981 845 Home Equity 2,676 121 1,707 82 Automobile 16,190 1,116 12,235 825 Other 1 2,624 215 2,571 215 Total Consumer 41,814 2,532 39,494 1,967 Total Impaired Loans with an Allowance Recorded $ 43,912 $ 2,657 $ 40,893 $ 2,063 Impaired Loans: Commercial $ 14,442 $ 664 $ 20,924 $ 840 Consumer 41,814 2,532 39,494 1,967 Total Impaired Loans $ 56,256 $ 3,196 $ 60,418 $ 2,807 1 Comprised of other revolving credit and installment financing. For the year ended December 31, 2016 , the average recorded investment in impaired loans was $62.1 million and the interest income recognized on impaired loans was $2.7 million . For the years ended December 31, 2018 , 2017 , and 2016 , the amount of interest income recognized by the Company within the period that the loans were impaired were primarily related to loans modified in a troubled debt restructuring that were on accrual status. For the years ended December 31, 2018 , 2017 , and 2016 , the amount of interest income recognized using a cash-basis method of accounting during the time within that period that the loans were impaired was not material. Modifications A modification of a loan constitutes a troubled debt restructuring (“TDR”) when the Company for economic or legal reasons related to a borrower’s financial difficulties grants a concession to the borrower that it would not otherwise consider. Loans modified in a TDR were $54.0 million and $60.1 million as of December 31, 2018 and 2017 , respectively. As of December 31, 2018 , there were $0.2 million commitments to lend additional funds on loans modified in a TDR. As of December 31, 2017 , there were $1.5 million commitments to lend additional funds on loans modified in a TDR. The Company offers various types of concessions when modifying a loan or lease. Commercial and industrial loans modified in a TDR often involve temporary interest-only payments, term extensions, and converting revolving credit lines to term loans. Additional collateral, a co-borrower, or a guarantor is often requested. Commercial mortgage and construction loans modified in a TDR often involve reducing the interest rate for the remaining term of the loan, extending the maturity date at an interest rate lower than the current market rate for new debt with similar risk, or substituting or adding a co-borrower or guarantor. Construction loans modified in a TDR may also involve extending the interest-only payment period. Residential mortgage loans modified in a TDR generally include a lower interest rate and the loan being fully amortized for up to 40 years from the modification effective date. In some cases, the Company may forbear a portion of the unpaid principal balance with a balloon payment due upon maturity or pay-off of the loan. Land loans are also included in the class of residential mortgage loans. Land loans are typically structured as interest-only monthly payments with a balloon payment due at maturity. Land loan modifications usually involve extending the interest-only payments up to an additional five years with a balloon payment due at maturity, or re-amortizing the remaining balance over a period up to 360 months . Interest rates are not changed for land loan modifications. Home equity modifications are made infrequently and uniquely designed to meet the specific needs of each borrower. Automobile loans modified in a TDR are primarily comprised of loans where the Company has lowered monthly payments by extending the term. Loans modified in a TDR are typically already on non-accrual status and partial charge-offs have in some cases already been taken against the outstanding loan balance. As a result, loans modified in a TDR may have the financial effect of increasing the specific Allowance associated with the loan. An Allowance for impaired commercial and consumer loans that have been modified in a TDR is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the estimated fair value of the collateral, less any selling costs, if the loan is collateral dependent. Management exercises significant judgment in developing these estimates. The following presents by class, information related to loans modified in a TDR during the years ended December 31, 2018 and 2017 . Loans Modified as a TDR for the Loans Modified as a TDR for the Troubled Debt Restructurings (dollars in thousands ) Number of Recorded 1 Increase in Number of Recorded 1 Increase in Commercial Commercial and Industrial 12 $ 1,449 $ 96 13 $ 7,299 $ 11 Commercial Mortgage 1 1,650 74 4 2,336 93 Total Commercial 13 3,099 170 17 9,635 104 Consumer Residential Mortgage 6 1,458 200 2 368 1 Home Equity 9 1,438 77 4 604 13 Automobile 366 7,400 128 424 8,623 177 Other 2 138 927 25 171 1,395 35 Total Consumer 519 11,223 430 601 10,990 226 Total 532 $ 14,322 $ 600 618 $ 20,625 $ 330 1 The period end balances reflect all partial paydowns and charge-offs since the modification date. TDRs fully paid off, charged off, or foreclosed upon by period end are not included. 2 Comprised of other revolving credit and installment financing. The following presents by class, loans modified in a TDR that defaulted during the year ended December 31, 2018 and 2017 , and within twelve months of their modification date. A TDR is considered to be in default once it becomes 60 days or more past due following a modification. Year Ended December 31, 2018 Year Ended December 31, 2017 TDRs that Defaulted During the Period, (dollars in thousands) Number of Recorded 1 Number of Recorded 1 Commercial Commercial and Industrial 1 $ 3 1 $ 48 Commercial Mortgage — — 1 341 Total Commercial 1 3 2 389 Consumer Residential Mortgage — — 1 94 Home Equity — — 1 237 Automobile 38 680 28 515 Other 2 34 194 36 208 Total Consumer 72 874 66 1,054 Total 73 $ 877 68 $ 1,443 1 The period end balances reflect all paydowns and charge-offs since the modification date. TDRs fully paid off, charged off, or foreclosed upon by period end are not included. 2 Comprised of other revolving credit and installment financing. Loans modified in a TDR are closely monitored for delinquency as an early indicator of possible future default. If loans modified in a TDR subsequently default, the Company evaluates the loan for possible further impairment. The specific Allowance associated with the loan may be increased, 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. Foreclosure Proceedings Consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure totaled $4.0 million as of December 31, 2018 .

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2018
Transfers and Servicing of Financial Assets [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights The Company’s portfolio of residential mortgage loans serviced for third parties was $2.9 billion as of December 31, 2018 and 2017 , and $2.7 billion as of December 31, 2016 . Substantially all of these loans were originated by the Company and sold to third parties on a non-recourse basis with servicing rights retained. These retained servicing rights are recorded as a servicing asset and are initially recorded at fair value (see Note 21 Fair Value of Assets and Liabilities for more information). Changes to the balance of mortgage servicing rights are recorded in mortgage banking income in the Company’s consolidated statements of income. The Company’s mortgage servicing activities include collecting principal, interest, and escrow payments from borrowers; making tax and insurance payments on behalf of borrowers; monitoring delinquencies and executing foreclosure proceedings; and accounting for and remitting principal and interest payments to investors. Servicing income, including late and ancillary fees, was $7.3 million , $7.1 million , and $6.9 million for the years ended December 31, 2018 , 2017 , and 2016 , respectively. Servicing income is recorded in mortgage banking income in the Company’s consolidated statements of income. The Company’s residential mortgage investor loan servicing portfolio is primarily comprised of fixed rate loans concentrated in Hawaii. For the years ended December 31, 2018 , 2017 , and 2016 , the change in the fair value of the Company’s mortgage servicing rights accounted for under the fair value measurement method was as follows: (dollars in thousands) 2018 2017 2016 Balance at Beginning of Year $ 1,454 $ 1,655 $ 1,970 Changes in Fair Value: Due to Payoffs (164 ) (201 ) (315 ) Total Changes in Fair Value of Mortgage Servicing Rights (164 ) (201 ) (315 ) Balance at End of Year $ 1,290 $ 1,454 $ 1,655 For the years ended December 31, 2018 , 2017 , and 2016 , the change in the carrying value of the Company’s mortgage servicing rights accounted for under the amortization method, net of valuation allowance was as follows: (dollars in thousands) 2018 2017 2016 Balance at Beginning of Year $ 23,168 $ 22,008 $ 21,032 Servicing Rights that Resulted From Asset Transfers 2,470 3,976 3,847 Amortization (2,618 ) (2,816 ) (2,892 ) Valuation Allowance Recovery (Provision) — — 21 Balance at End of Year $ 23,020 $ 23,168 $ 22,008 Valuation Allowance: Balance at Beginning of Year $ — $ — $ (21 ) Valuation Allowance Recovery (Provision) — — 21 Balance at End of Year $ — $ — $ — Fair Value: Balance at Beginning of Year $ 26,716 $ 25,148 $ 24,804 Balance at End of Year $ 29,218 $ 26,716 $ 25,148 The key data and assumptions used in estimating the fair value of the Company’s mortgage servicing rights as of December 31, 2018 and 2017 were as follows: December 31, 2018 2017 Weighted-Average Constant Prepayment Rate 1 7.01 % 8.50 % Weighted-Average Life (in years) 7.89 7.09 Weighted-Average Note Rate 4.06 % 4.04 % Weighted-Average Discount Rate 2 9.59 % 8.87 % 1 Represents annualized loan prepayment rate assumption. 2 Derived from multiple interest rate scenarios that incorporate a spread to a market yield curve and market volatilities. A sensitivity analysis of the Company’s fair value of mortgage servicing rights to changes in certain key assumptions as of December 31, 2018 and 2017 is presented in the following table. December 31, (dollars in thousands) 2018 2017 Constant Prepayment Rate Decrease in fair value from 25 basis points (“bps”) adverse change $ (361 ) $ (332 ) Decrease in fair value from 50 bps adverse change (716 ) (657 ) Discount Rate Decrease in fair value from 25 bps adverse change (325 ) (289 ) Decrease in fair value from 50 bps adverse change (643 ) (572 ) This analysis generally cannot be extrapolated because the relationship of a change in one key assumption to the change in the fair value of the Company’s mortgage servicing rights usually is not linear. Also, the effect of changing one key assumption without changing other assumptions is not realistic.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Premises and Equipment	The components of the Company’s premises and equipment as of December 31, 2018 and 2017 were as follows: (dollars in thousands) Cost Accumulated Net Book Value December 31, 2018 Premises $ 339,441 $ (238,450 ) $ 100,991 Equipment 120,165 (71,767 ) 48,398 Capital Leases 6,593 (4,145 ) 2,448 Total $ 466,199 $ (314,362 ) $ 151,837 December 31, 2017 Premises $ 331,566 $ (243,069 ) $ 88,497 Equipment 130,228 (90,319 ) 39,909 Capital Leases 6,593 (4,073 ) 2,520 Total $ 468,387 $ (337,461 ) $ 130,926 Depreciation and amortization (including capital lease amortization) included in noninterest expense was $14.4 million , $13.0 million , and $12.9 million for the years ended December 31, 2018 , 2017 , and 2016 , respectively. There was no impairment of the Company’s premises and equipment for the years ended December 31, 2018 , 2017 , and 2016 .

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	The components of the Company’s other assets as of December 31, 2018 and 2017 were as follows: December 31, (dollars in thousands) 2018 2017 Federal Home Loan Bank and Federal Reserve Bank Stock $ 35,858 $ 40,645 Derivative Financial Instruments 14,604 10,518 Low-Income Housing and Other Equity Investments 85,860 87,632 Deferred Compensation Plan Assets 31,871 29,230 Prepaid Expenses 8,533 7,944 Accounts Receivable 1 18,996 49,264 Other 1 35,160 27,363 Total Other Assets $ 230,882 $ 252,596 1 Certain prior period information has been reclassified to conform to current presentation.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2018
Deposits [Abstract]
Deposits	Time Deposits As of December 31, 2018 and 2017 , the Company’s total time deposits were $1.7 billion . As of December 31, 2018 , the contractual maturities of these time deposits were as follows: (dollars in thousands) Amount 2019 $ 1,441,580 2020 119,894 2021 115,528 2022 32,881 2023 28,035 Thereafter 7,604 Total $ 1,745,522 The amount of time deposits with balances of $100,000 or more was $1.5 billion and $1.4 billion as of December 31, 2018 and 2017 , respectively. As of December 31, 2018 , the contractual maturities of these time deposits were as follows: (dollars in thousands) Amount Three Months or Less $ 756,146 Over Three Months through Six Months 197,485 Over Six Months through Twelve Months 352,539 Over Twelve Months 191,839 Total $ 1,498,009 Public Deposits As of December 31, 2018 and 2017 , deposits of governmental entities of $1.1 billion and $1.3 billion , respectively, required collateralization by acceptable investment securities of the Company.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2018
Borrowings Disclosure Abstract
Borrowings	Borrowings Details of the Company’s short-term borrowings (original term of one year or less) as of December 31, 2018 and 2017 were as follows: December 31, (dollars in thousands) 2018 2017 Securities Sold Under Agreements to Repurchase (short-term) 1 Amounts Outstanding $ 4,196 $ 1,603 Weighted-Average Interest Rate 1.19 % 0.14 % 1 Consists entirely of repurchase agreements with government entities. Excludes long-term repurchase agreements with government entities of $0.1 million and $3.7 million as of December 31, 2018 , and 2017 , respectively, and long-term repurchase agreements with private institutions of $500.0 million as of December 31, 2018 and 2017 . The Company’s total securities sold under agreements to repurchase were $504.3 million and $505.3 million as of December 31, 2018 and 2017 , respectively. As of December 31, 2018 , all of our repurchase agreements were at fixed interest rates. As of December 31, 2018 , long-term repurchase agreements (original term over one year) placed with government entities were $0.1 million with a weighted-average interest rate of 1.30% and a weighted-average maturity of 56 days. As of December 31, 2018 , long-term repurchase agreements placed with private institutions were $500.0 million with a weighted-average interest rate of 3.64% . Remaining terms ranged from 2020 to 2022 with a weighted-average maturity of 2.6 years. Some of our repurchase agreements with private institutions may be terminated at earlier specified dates by the private institution or in some cases by either the private institution or the Company. If all such agreements were to terminate at the earliest possible date, the weighted-average maturity for our repurchase agreements with private institutions would decrease to 2.0 years.

Other Debt

Other Debt	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Other Debt	The Company’s other debt as of December 31, 2018 and 2017 were as follows: December 31, (dollars in thousands) 2018 2017 Federal Home Loan Bank Advances $ 125,000 $ 250,000 Capital Lease Obligations 10,643 10,716 Total $ 135,643 $ 260,716 As a member of the FHLB, the Bank may borrow funds from the FHLB in amounts up to 45% of the Bank’s total assets, provided the Bank is able to pledge an adequate amount of qualified assets to secure the borrowings. As of December 31, 2018 , FHLB advances totaled $125.0 million with a weighted-average interest rate of 1.93% and maturity dates ranging from 2019 to 2020. As of December 31, 2018 , the Company had a remaining line of credit with the FHLB of $2.2 billion . See Note 4 Loans and Leases and the Allowance for Loan and Lease Losses for loans pledged to the FHLB as of December 31, 2018 and 2017 . Capital lease obligations relate to office space at the Company’s headquarters. The lease began in 1993 and has a 60 year term. Lease payments are fixed at $0.8 million per year through December 2022 and are negotiable thereafter. As of December 31, 2018 , the Company had an undrawn line of credit with the FRB of $538.5 million . See Note 4 Loans and Leases and the Allowance for Loan and Lease Losses for loans pledged to the FRB as of December 31, 2018 and 2017 . As of December 31, 2018 , the annual maturities of the Company’s other debt, exclusive of capital lease obligations, were expected to be as follows: (dollars in thousands) Amount 2019 $ 50,000 2020 75,000 2021 — 2022 — 2023 — Thereafter — Total $ 125,000

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Regulatory Capital The table below sets forth the minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts and ratios for the Company and the Bank as of December 31, 2018 and 2017 : (dollars in thousands) Well Capitalized Company Bank As of December 31, 2018 Shareholders’ Equity $ 1,268,200 $ 1,195,132 Common Equity Tier 1 Capital 1,290,723 1,229,227 Tier 1 Capital 1,290,723 1,229,227 Total Capital 1,404,238 1,342,742 Common Equity Tier 1 Capital Ratio 6.5 % 13.07 % 12.46 % Tier 1 Capital Ratio 8.0 % 13.07 % 12.46 % Total Capital Ratio 10.0 % 14.21 % 13.61 % Tier 1 Leverage Ratio 5.0 % 7.60 % 7.24 % As of December 31, 2017 Shareholders’ Equity $ 1,231,868 $ 1,161,037 Common Equity Tier 1 Capital 1,238,063 1,178,804 Tier 1 Capital 1,238,063 1,178,804 Total Capital 1,352,231 1,292,972 Common Equity Tier 1 Capital Ratio 6.5 % 13.24 % 12.62 % Tier 1 Capital Ratio 8.0 % 13.24 % 12.62 % Total Capital Ratio 10.0 % 14.46 % 13.85 % Tier 1 Leverage Ratio 5.0 % 7.26 % 6.92 % The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can result in certain mandatory, and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classifications are also subject to qualitative judgments by regulators about the components of regulatory capital, risk weightings, and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of Common Equity Tier 1, Tier 1 and Total Capital. Both Common Equity Tier 1 Capital and Tier 1 Capital are common shareholders’ equity, reduced by certain intangible assets, postretirement benefit liability adjustments, and unrealized gains and losses on investment securities. Total Capital is Tier 1 Capital plus an allowable amount of the reserve for credit losses. Risk-weighted assets are calculated by taking assets and credit equivalent amounts of off-balance-sheet items and assigning them to one of several broad risk categories. Four capital ratios are used to measure capital adequacy: Common Equity Tier 1 Capital divided by risk-weighted assets, as defined; Tier 1 Capital divided by risk-weighted assets; Total Capital divided by risk-weighted assets; and the Tier 1 Leverage ratio, which is Tier 1 Capital divided by quarterly adjusted average total assets. In addition to the minimum risk-based capital requirements, all banks must hold additional capital, referred to as the capital conservation buffer (which is in the form of common equity) under the U.S. Basel III capital framework, to avoid being subject to limits on capital distributions and certain discretionary bonus payments to officers. When fully phased-in on January 1, 2019 the capital conservation buffer will be a minimum of 2.5% additional capital in addition to the minimum risk-based capital ratios. For 2018, the phase-in transition portion of that buffer was a minimum of 1.875%. As of December 31, 2018 , the Company and the Bank were well capitalized as defined in the regulatory framework for prompt corrective action. The capital conservation buffer requirements do not currently result in any limitations on distributions or discretionary bonuses for the Company or the Bank. There were no conditions or events since December 31, 2018 that management believes have changed the Company or the Bank’s capital classifications. Dividends Dividends paid by the Parent are substantially funded from dividends received from the Bank. The Bank is subject to federal and state regulatory restrictions that limit cash dividends and loans to the Parent. These restrictions generally require advanced approval from the Bank’s regulator for payment of dividends in excess of the sum of net income for the current calendar year and the retained net income of the prior two calendar years. Common Stock Repurchase Program The Parent has a common stock repurchase program in which shares repurchased are held in treasury stock for reissuance in connection with share-based compensation plans and for general corporate purposes. For the year ended December 31, 2018 , the Parent repurchased 1,079,397 shares of common stock under its share repurchase program at an average cost per share of $81.80 and total cost of $88.3 million . From the beginning of the stock repurchase program in July 2001 through December 31, 2018 , the Parent repurchased a total of 55.3 million shares of common stock at an average cost of $39.14 per share and total cost over $2.1 billion . From January 1, 2019 through February 15, 2019 , the Parent repurchased an additional 298,500 shares of common stock at an average cost of $75.46 per share for a total of $22.5 million . The actual amount and timing of future share repurchases, if any, will depend on market conditions, applicable SEC rules and various other factors. Accumulated Other Comprehensive Income The following table presents the components of other comprehensive income (loss), net of tax: (dollars in thousands) Before Tax Tax Effect Net of Tax Year Ended December 31, 2018 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ (11,051 ) $ (2,931 ) $ (8,120 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 2,164 569 1,595 Net Unrealized Gains (Losses) on Investment Securities (8,887 ) (2,362 ) (6,525 ) Defined Benefit Plans: Net Actuarial Gains (Losses) Arising During the Period (4,468 ) (1,184 ) (3,284 ) Amortization of Net Actuarial Losses (Gains) 1,835 460 1,375 Amortization of Prior Service Credit (567 ) (150 ) (417 ) Defined Benefit Plans, Net (3,200 ) (874 ) (2,326 ) Other Comprehensive Income (Loss) $ (12,087 ) $ (3,236 ) $ (8,851 ) Year Ended December 31, 2017 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ (5,263 ) $ (2,078 ) $ (3,185 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 1,982 783 1,199 Net Unrealized Gains (Losses) on Investment Securities (3,281 ) (1,295 ) (1,986 ) Defined Benefit Plans: Net Actuarial Gains (Losses) Arising During the Period 884 349 535 Amortization of Net Actuarial Losses (Gains) 1,382 545 837 Amortization of Prior Service Credit (322 ) (127 ) (195 ) Defined Benefit Plans, Net 1,944 767 1,177 Other Comprehensive Income (Loss) $ (1,337 ) $ (528 ) $ (809 ) Year Ended December 31, 2016 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ (18,647 ) $ (7,358 ) $ (11,289 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 1,605 634 971 Net Unrealized Gains (Losses) on Investment Securities (17,042 ) (6,724 ) (10,318 ) Defined Benefit Plans: Net Actuarial Gains (Losses) Arising During the Period (954 ) (377 ) (577 ) Amortization of Net Actuarial Losses (Gains) 1,224 483 741 Amortization of Prior Service Credit (322 ) (127 ) (195 ) Defined Benefit Plans, Net (52 ) (21 ) (31 ) Other Comprehensive Income (Loss) $ (17,094 ) $ (6,745 ) $ (10,349 ) 1 The amount relates to the amortization/accretion of unrealized gains and losses related to the Company's reclassification of available-for-sale investment securities to the held-to-maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield. The following table presents the changes in each component of accumulated other comprehensive income (loss), net of tax: (dollars in thousands) Investment Securities-Available-For-Sale Investment Securities-Held-To-Maturities Defined Benefit Plans Accumulated Other Comprehensive Income (Loss) Year Ended December 31, 2018 Balance at Beginning of Period $ (1,915 ) $ (5,085 ) $ (27,715 ) $ (34,715 ) Other Comprehensive Income (Loss) Before Reclassifications (8,120 ) — (3,284 ) (11,404 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 1,595 958 2,553 Total Other Comprehensive Income (Loss) (8,120 ) 1,595 (2,326 ) (8,851 ) Reclassification of the Income Tax Effects of the Tax Act from AOCI (412 ) (1,096 ) (5,969 ) (7,477 ) Balance at End of Period $ (10,447 ) $ (4,586 ) $ (36,010 ) $ (51,043 ) Year Ended December 31, 2017 Balance at Beginning Period $ 1,270 $ (6,284 ) $ (28,892 ) $ (33,906 ) Other Comprehensive Income (Loss) Before Reclassifications (3,185 ) — 535 (2,650 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 1,199 642 1,841 Total Other Comprehensive Income (Loss) (3,185 ) 1,199 1,177 (809 ) Balance at End of Period $ (1,915 ) $ (5,085 ) $ (27,715 ) $ (34,715 ) Year Ended December 31, 2016 Balance at Beginning Period $ 12,559 $ (7,255 ) $ (28,861 ) $ (23,557 ) Other Comprehensive Income (Loss) Before Reclassifications (11,289 ) — (577 ) (11,866 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 971 546 1,517 Total Other Comprehensive Income (Loss) (11,289 ) 971 (31 ) (10,349 ) Balance at End of Period $ 1,270 $ (6,284 ) $ (28,892 ) $ (33,906 ) The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss): Details about Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified from Accumulated Other Comprehensive Income (Loss) 1 Affected Line Item in the Statement Where Net Income Is Presented (dollars in thousands) Year Ended December 31, 2018 2017 2016 Amortization of Unrealized Holding Gains (Losses) on Investment Securities Held-to-Maturity $ (2,164 ) $ (1,982 ) $ (1,605 ) Interest Income 569 783 634 Provision for Income Tax (1,595 ) (1,199 ) (971 ) Net of Tax Amortization of Defined Benefit Plans Items Prior Service Credit 2 567 322 322 Net Actuarial Losses 2 (1,835 ) (1,382 ) (1,224 ) (1,268 ) (1,060 ) (902 ) Total Before Tax 310 418 356 Provision for Income Tax (958 ) (642 ) (546 ) Net of Tax Total Reclassifications for the Period $ (2,553 ) $ (1,841 ) $ (1,517 ) Net of Tax 1 Amounts in parentheses indicate reductions to net income. 2 These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost and are included in Other Noninterest Expense on the consolidated statements of income (see Note 14 Pension Plans and Postretirement Benefit Plan for additional details).

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share There were no adjustments to net income, the numerator, for purposes of computing basic earnings per share. The following is a reconciliation of the weighted average number of common shares outstanding for computing diluted earnings per share and antidilutive stock options and restricted stock outstanding for the years ended December 31, 2018 , 2017 , and 2016 : Weighted Average Shares 2018 2017 2016 Denominator for Basic Earnings Per Share 41,714,770 42,280,931 42,644,100 Dilutive Effect of Equity Based Awards 284,629 326,126 235,683 Denominator for Diluted Earnings Per Share 41,999,399 42,607,057 42,879,783 Antidilutive Stock Options and Restricted Stock Outstanding — — —

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Business Segments	Business Segments The Company’s business segments are defined as Retail Banking, Commercial Banking, Investment Services and Private Banking, and Treasury and Other. The Company’s internal management accounting process measures the performance of these business segments. This process, which is not necessarily comparable with the process used by any other financial institution, uses various techniques to assign balance sheet and income statement amounts to the business segments, including allocations of income, expense, the provision for credit losses, and capital. This process is dynamic and requires certain allocations based on judgment and other subjective factors. Unlike financial accounting, there is no comprehensive authoritative guidance for management accounting that is equivalent to GAAP. Previously reported results have been reclassified to conform to the current reporting structure. The net interest income of the business segments reflects the results of a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics and reflects the allocation of net interest income related to the Company’s overall asset and liability management activities on a proportionate basis. The basis for the allocation of net interest income is a function of the Company’s assumptions that are subject to change based on changes in current interest rates and market conditions. Funds transfer pricing also serves to transfer interest rate risk to Treasury. However, the other business segments have some latitude to retain certain interest rate exposures related to customer pricing decisions within guidelines. The provision for credit losses reflects the actual net charge-offs of the business segments. The amount of the consolidated provision for loan and lease losses is based on the methodology that we use to estimate our consolidated Allowance. The residual provision for credit losses to arrive at the consolidated provision for credit losses is included in Treasury and Other. Noninterest income and expense includes allocations from support units to business units. These allocations are based on actual usage where practicably calculated or by management’s estimate of such usage. The provision for income taxes is allocated to business segments using a 26% effective income tax rate. However, the provision for income taxes for our Leasing business unit (included in the Commercial Banking segment) and Auto Leasing portfolio and Pacific Century Life Insurance business unit (both included in the Retail Banking segment) are assigned their actual effective income tax rates due to the unique relationship that income taxes have with their products. The residual income tax expense or benefit to arrive at the consolidated effective tax rate is included in Treasury and Other. Retail Banking Retail Banking offers a broad range of financial products and services to consumers and small businesses. Loan and lease products include residential mortgage loans, home equity lines of credit, automobile loans and leases, personal lines of credit, installment loans, small business loans and leases, and credit cards. Deposit products include checking, savings, and time deposit accounts. Retail Banking also offers retail insurance products. Products and services from Retail Banking are delivered to customers through 69 branch locations and 382 ATMs throughout Hawaii and the Pacific Islands, e-Bankoh (on-line banking service), a 24-hour customer service center, and a mobile banking service. Commercial Banking Commercial Banking offers products including corporate banking, commercial real estate loans, commercial lease financing, auto dealer financing, and deposit products. Commercial lending and deposit products are offered to middle-market and large companies in Hawaii and the Pacific Islands. In addition, Commercial Banking offers deposit products to government entities in Hawaii. Commercial real estate mortgages focus on customers that include investors, developers, and builders predominantly domiciled in Hawaii. Commercial Banking also includes international banking and provides merchant services to its customers. Investment Services and Private Banking Investment Services and Private Banking includes private banking and international client banking services, trust services, investment management, and institutional investment advisory services. A significant portion of this segment’s income is derived from fees, which are generally based on the market values of assets under management. The private banking and personal trust groups assist individuals and families in building and preserving their wealth by providing investment, credit, and trust services to high-net-worth individuals. The investment management group manages portfolios utilizing a variety of investment products. Institutional client services offer investment advice to corporations, government entities, and foundations. This segment also provides a full service brokerage offering equities, mutual funds, life insurance, and annuity products Treasury and Other Treasury consists of corporate asset and liability management activities, including interest rate risk management and a foreign currency exchange business. This segment’s assets and liabilities (and related interest income and expense) consist of interest-bearing deposits, investment securities, federal funds sold and purchased, and short and long-term borrowings. The primary sources of noninterest income are from bank-owned life insurance, net gains from the sale of investment securities, and foreign exchange income related to customer-driven currency requests from merchants and island visitors. The net residual effect of the transfer pricing of assets and liabilities is included in Treasury, along with the elimination of intercompany transactions. Other organizational units (Technology, Operations, Marketing, Human Resources, Finance, Credit and Risk Management, and Corporate and Regulatory Administration) provide a wide-range of support to the Company’s other income earning segments. Expenses incurred by these support units are charged to the business segments through an internal cost allocation process. Selected business segment financial information as of and for the years ended December 31, 2018 , 2017 , and 2016 were as follows: (dollars in thousands) Retail Commercial Investment Services and Private Banking Treasury Consolidated Year Ended December 31, 2018 Net Interest Income $ 264,459 $ 179,577 $ 41,222 $ 1,094 $ 486,352 Provision for Credit Losses 14,898 (760 ) (61 ) (652 ) 13,425 Net Interest Income After Provision for Credit Losses 249,561 180,337 41,283 1,746 472,927 Noninterest Income 79,004 23,733 55,338 10,848 168,923 Noninterest Expense (211,761 ) (81,344 ) (65,847 ) (12,672 ) (371,624 ) Income Before Provision for Income Taxes 116,804 122,726 30,774 (78 ) 270,226 Provision for Income Taxes (29,172 ) (28,496 ) (8,113 ) 15,157 (50,624 ) Net Income $ 87,632 $ 94,230 $ 22,661 $ 15,079 $ 219,602 Total Assets as of December 31, 2018 $ 6,365,263 $ 3,958,523 $ 349,832 $ 6,470,356 $ 17,143,974 Year Ended December 31, 2017 Net Interest Income $ 264,041 $ 171,038 $ 29,693 $ (7,534 ) $ 457,238 Provision for Credit Losses 14,008 (160 ) (21 ) 3,073 16,900 Net Interest Income After Provision for Credit Losses 250,033 171,198 29,714 (10,607 ) 440,338 Noninterest Income 85,042 21,670 57,105 21,600 185,417 Noninterest Expense (209,807 ) (74,209 ) (61,674 ) (12,001 ) (357,691 ) Income Before Provision for Income Taxes 125,268 118,659 25,145 (1,008 ) 268,064 Provision for Income Taxes (44,545 ) (41,797 ) (9,303 ) 12,253 (83,392 ) Net Income $ 80,723 $ 76,862 $ 15,842 $ 11,245 $ 184,672 Total Assets as of December 31, 2017 $ 5,936,568 $ 3,742,991 $ 336,455 $ 7,073,038 $ 17,089,052 Year Ended December 31, 2016 Net Interest Income $ 242,967 $ 156,080 $ 24,714 $ (6,182 ) $ 417,579 Provision for Credit Losses 10,700 (7,322 ) (23 ) 1,395 4,750 Net Interest Income After Provision for Credit Losses 232,267 163,402 24,737 (7,577 ) 412,829 Noninterest Income 91,824 26,967 57,396 21,156 197,343 Noninterest Expense (208,389 ) (70,405 ) (59,782 ) (12,002 ) (350,578 ) Income Before Provision for Income Taxes 115,702 119,964 22,351 1,577 259,594 Provision for Income Taxes (41,067 ) (42,667 ) (8,270 ) 13,871 (78,133 ) Net Income $ 74,635 $ 77,297 $ 14,081 $ 15,448 $ 181,461 Total Assets as of December 31, 2016 $ 5,342,078 $ 3,565,912 $ 280,410 $ 7,303,967 $ 16,492,367

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Benefits	Employee Benefits The Company has defined contribution plans, defined benefit plans, and a postretirement benefit plan. Defined Contribution Plans The Bank of Hawaii Retirement Savings Plan (the “Savings Plan”) has three Company contribution components in addition to employee contributions: 1) 401(k) matching, as described below; 2) a 3% fixed amount based on eligible compensation; and 3) a discretionary value-sharing contribution. Under the 401(k) matching component, participating employees may contribute up to 50% of their eligible compensation (within federal limits) to the Savings Plan. The Company makes matching contributions on behalf of participants equal to $1.25 for each $1.00 contributed by participants, up to 2% of the participants’ eligible compensation, and $0.50 for every $1.00 contributed by participants over 2% , up to 5% of the participants’ eligible compensation. A 3% fixed contribution and a discretionary value-sharing contribution, that is linked to the Company’s financial goals, are made regardless of whether the participating employee contributes to the Savings Plan and are invested in accordance with the participant’s selection of investment options available under the Savings Plan. The Company also has a non-qualified savings plan which covers certain employees with compensation exceeding Internal Revenue Service (“IRS”) limits on pay amounts in the allocation of the Savings Plan’s benefits. Total expense for all components of the Company’s defined contribution plans was $14.5 million , $13.5 million , and $12.8 million for the years ended December 31, 2018 , 2017 , and 2016 , respectively. Defined Benefit Plans The Company has two defined benefit plans (the “Pension Plans”). In 1995, the Company froze its non-contributory, qualified defined benefit retirement plan (the “Retirement Plan”) and the excess retirement plan (the “Excess Plan”), which covered employees of the Company and participating subsidiaries who met certain eligibility requirements. Beginning January 1, 2001, the Pension Plans no longer provided for compensation increases in the determination of benefits. The projected benefit obligation is equal to the accumulated benefit obligation due to the frozen status of the Pension Plans. The assets of the Retirement Plan primarily consist of equity and fixed income mutual funds. The Excess Plan is a non-qualified excess retirement benefit plan which covers certain employees of the Company and participating subsidiaries with compensation exceeding IRS limits on pay amounts applicable to the Pension Plan’s benefit formula. The Excess Plan has no plan assets. The Excess Plan’s projected benefit obligation and accumulated benefit obligation were $3.6 million and $3.9 million as of December 31, 2018 and 2017 , respectively. Postretirement Benefit Plan The Company’s postretirement benefit plan provides retirees hired before January 1, 2012 with medical and dental insurance coverage. For eligible participants that retired before 2008 and met certain age requirements, the Company and retiree share in the cost of providing postretirement benefits where both the employer and retiree pay a portion of the insurance premiums. Eligible participants who retired before 2008 who did not meet certain age requirements continued on the Company’s benefit plans, but pay for their full insurance premiums. Participants who retired on or after January 1, 2008, who had medical or dental coverage under the Company’s plans immediately before retirement and meet certain age and years of service requirements as of December 31, 2008 are also eligible to participate in the Company’s benefit plans, but must pay for their full insurance premiums. Retirees age 65 and older are provided with a Medicare supplemental plan subsidy. Most employees of the Company who have met certain eligibility requirements are covered by this plan. Participants who retired on or after January 1, 2008 who met certain age and/or years of service requirements are eligible for the Health Reimbursement Account (“HRA”) program. The HRA program provides retirees with an initial credit based on years of service. Thereafter, an annual credit up to a maximum of $1,200 is provided into the HRA. The retiree may use the HRA for medical, vision, prescription drug and dental premiums, co-payments, and medically necessary health care expenses that are not covered by any medical or dental insurance program or flexible health spending account. The plan was amended to provide access-only coverage for employees hired on or after January 1, 2012, and lowered eligibility for access from age 55 to age 50. These retirees continue on the medical and dental plan until age 65 paying the full premium. As of December 31, 2018 and 2017 , the Company had no segregated assets to provide for postretirement benefits. The following table provides a reconciliation of changes in benefit obligation and fair value of plan assets, as well as the funded status recognized in the Company’s consolidated statements of condition for the Pension Plans and postretirement benefit plan for the years ended December 31, 2018 and 2017 . Pension Benefits Postretirement Benefits (dollars in thousands) 2018 2017 2018 2017 Benefit Obligation at Beginning of Year $ 110,080 $ 107,593 $ 24,206 $ 24,308 Service Cost — — 457 453 Interest Cost 4,193 4,665 936 1,093 Plan Amendment 3 — — — (2,730 ) Actuarial Losses (Gains) (5,031 ) 6,828 (869 ) 2,052 Employer Benefits Paid 1 (6,580 ) (9,006 ) (1,278 ) (970 ) Benefit Obligation at End of Year $ 102,662 $ 110,080 $ 23,452 $ 24,206 Fair Value of Plan Assets at Beginning of Year $ 96,908 $ 83,383 $ — $ — Actual Return on Plan Assets (5,246 ) 12,047 — — Employer Contributions 471 10,484 1,278 970 Employer Benefits Paid 1 (6,580 ) (9,006 ) (1,278 ) (970 ) Fair Value of Plan Assets at End of Year $ 85,553 $ 96,908 $ — $ — Funded Status at End of Year 2 $ (17,109 ) $ (13,172 ) $ (23,452 ) $ (24,206 ) 1 Participants' contributions relative to the postretirement benefit plan were offset against employer benefits paid in the table above. Participants' contributions for postretirement benefits were $0.6 million and $0.5 million for the years ended December 31, 2018 and 2017 , respectively. 2 Amounts are recognized in Retirement Benefits Payable in the consolidated statements of condition. 3 For certain retirees, medical premiums were changed to a full retiree rate instead of a blended rate. The changes in actuarial losses and (gains) related to the Company’s Pension and postretirement benefit Plans are mainly due to changes in discount rates for the years ended December 31, 2018 and 2017 . For the year ended December 31, 2018 , the change in discount rate resulted in a $5.4 million reduction to the Company’s Pension Plans liability and a $1.6 million reduction to the Company’s postretirement benefit plan liability. For the year ended December 31, 2017 , the change in discount rate resulted in a $6.0 million increase to the Company’s Pension Plans liability and a $1.8 million increase to the Company’s postretirement benefit plan liability. The following presents the amounts recognized in the Company’s accumulated other comprehensive income for the Pension Plans and postretirement benefit plan as of December 31, 2018 and 2017 . Pension Benefits Postretirement Benefits (dollars in thousands) 2018 2017 2018 2017 Amounts Recognized in Accumulated Other Net Actuarial Gains (Losses) $ (42,127 ) $ (32,730 ) $ 4,261 $ 3,143 Net Prior Service Credit — — 1,856 1,872 Total Amounts Recognized in Accumulated Other $ (42,127 ) $ (32,730 ) $ 6,117 $ 5,015 Components of net periodic benefit cost for the Company’s Pension Plans and the postretirement benefit plan are presented in the following table for the years ended December 31, 2018 , 2017 , and 2016 . Pension Benefits Postretirement Benefits (dollars in thousands) 2018 2017 2016 2018 2017 2016 Service Cost $ — $ — $ — $ 457 $ 453 $ 513 Interest Cost 4,193 4,665 4,882 936 1,093 1,134 Expected Return on Plan Assets (5,122 ) (5,011 ) (5,121 ) — — — Amortization of: Prior Service Credit 1 — — — (567 ) (322 ) (322 ) Net Actuarial Losses (Gains) 1 2,099 1,817 1,617 (264 ) (435 ) (393 ) Net Periodic Benefit Cost $ 1,170 $ 1,471 $ 1,378 $ 562 $ 789 $ 932 1 Represents reclassification adjustments from accumulated other comprehensive income during the period. Assumptions used to determine the benefit obligations as of December 31, 2018 and 2017 for the Company’s Pension Plans and postretirement benefit plan were as follows: Pension Benefits Postretirement Benefits 2018 2017 2018 2017 Weighted Average Assumptions as of December 31: Discount Rate 4.41 % 3.90 % 4.48 % 3.96 % Health Care Cost Trend Rate Assumed For Next Year — — 6.00 % 6.30 % The health care cost trend rate is assumed to decrease annually, until reaching the ultimate trend rate of 4.5% in 2036 . Assumptions used to determine the net periodic benefit cost for the Company’s Pension Plans and postretirement benefit plan for the years ended December 31, 2018 , 2017 , and 2016 were as follows: Pension Benefits Postretirement Benefits 2018 2017 2016 2018 2017 2016 Weighted Average Assumptions as of December 31: Discount Rate 3.90 % 4.45 % 4.70 % 3.96 % 4.57 % 4.74 % Expected Long-Term Rate of Return on Plan Assets 5.75 % 5.75 % 6.00 % — — — Health Care Cost Trend Rate — — — 6.30 % 6.50 % 6.70 % A combination of factors is used by management in determining the expected long-term rate of return on plan assets. Historical return experience for major asset categories are evaluated and current market factors, such as inflation and interest rates, are considered in determining the expected long-term rate of return assumption. The Company expects to contribute $0.5 million to the Pension Plans and $0.9 million to the postretirement benefit plan for the year ending December 31, 2019 . As of December 31, 2018 , expected benefits to be paid in each of the next five years and in the aggregate for the five years thereafter were as follows: (dollars in thousands) Pension Benefits Postretirement Benefits 2019 $ 6,918 $ 886 2020 7,020 943 2021 7,163 1,020 2022 7,189 1,137 2023 7,195 1,231 Years 2024-2028 35,466 7,982 Retirement Plan Assets The Company’s overall investment strategy is to maintain the purchasing power of the current assets and all future contributions by producing positive rates of return on plan assets; achieve capital growth towards the attainment of full funding of the Retirement Plan’s termination liability; maximize returns within reasonable and prudent levels of risk; and control costs of administering the plan and managing the investments. The long-term investment objective is to achieve an overall annualized total return, gross of fees, above the blended benchmark index comprised of 36% MSCI USA IMI Index, 24% MSCI ACWI ex-US Index, and 40% Barclays Capital Aggregate Bond Index. Subject to liquidity requirements, the asset allocation targets are 60% for equity securities, 40% for fixed income securities with a 10% to 20% range permitted from the strategic targets, and zero to 20% for cash. Within the equity securities portfolio, the range for domestic securities is from 50% to 100% and the range for international securities is from 0% to 50% . All assets selected for the Retirement Plan must have a readily ascertainable market value and must be readily marketable. Due to market fluctuations or cash flows, the allocation for each asset class may be breached by as much as 5% on a temporary basis. However, asset allocations are expected to conform to target ranges within 90 days of such an occurrence. The fair values of the Retirement Plan assets as of December 31, 2018 and 2017 by asset category were as follows: Fair Value Measurements Asset Category (dollars in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Total as of Dec. 31, 2018 Total as of Dec. 31, 2017 Cash $ 726 $ — $ — $ 726 $ 2,156 Equity Securities – Mutual Funds: Large-Cap 1,593 — — 1,593 1,748 Mixed-Cap 25,298 — — 25,298 29,459 International 21,621 — — 21,621 24,539 Emerging Market 2,150 — — 2,150 2,305 Fixed Income Securities – Mutual Funds 34,165 — — 34,165 36,701 Total $ 85,553 $ — $ — $ 85,553 $ 96,908 Quoted prices for these investments were available in active markets, and therefore were classified as Level 1 measurements in the fair value hierarchy.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation The Company has share-based compensation plans which allow grants of stock options, restricted stock, stock appreciation rights, and restricted stock units to its employees and non-employee directors. The Company’s employee stock option plans are shareholder approved and administered by the Human Resources and Compensation Committee of the Board of Directors. Stock options provide grantees the option to purchase shares of the Parent’s common stock at a specified exercise price and, generally, expire 10 years from the date of grant. Stock option grants include incentive and non-qualified stock options whose vesting may be subject to one or more criteria, including employment or achievement of Company performance measures. Stock option exercise prices were equal to the quoted market price of the Parent’s common stock on the date of grant. Restricted stock provides grantees with rights to shares of common stock upon completion of one or more criteria, including service period, performance or other conditions as established by the Compensation Committee, such as vesting tied to the Company’s financial performances relative to the peer group or achievement of an absolute financial performance target. During the restriction period, all shares are considered outstanding and dividends are paid on the restricted stock. Generally, restricted stock vests over periods ranging from one to four years from the date of grant. Restricted stock and dividends may be forfeited if an employee terminates prior to vesting. As of December 31, 2018 , total shares authorized under the plans were 2.1 million shares, of which 1.8 million shares were available for future grants. The Company recognizes compensation expense, measured as the fair value of the share-based award on the date of grant, on a straight-line basis over the requisite service period. Share-based compensation is recorded in the statements of income as a component of salaries and benefits for employees and as a component of other noninterest expense for non-employee directors, with a corresponding increase to capital surplus in shareholders’ equity. For the years ended December 31, 2018 , 2017 , and 2016 , compensation expense and the related income tax benefit recognized for stock options and restricted stock were as follows: (dollars in thousands) 2018 2017 2016 Compensation Expense $ 8,146 $ 7,369 $ 6,787 Income Tax Benefit 2,160 2,910 2,680 Restricted Stock As of December 31, 2018 , unrecognized compensation expense related to unvested restricted stock was $10.6 million . The unrecognized compensation expense is expected to be recognized over a weighted average period of 1.84 years. The following table presents the activity for restricted stock: Number of Shares Weighted Average Grant Date Fair Value Unvested as of December 31, 2015 268,813 $ 55.92 Granted 121,495 64.40 Vested (105,891 ) 53.46 $ 5,661 Forfeited (13,894 ) 58.14 Unvested as of December 31, 2016 270,523 $ 60.58 Granted 124,460 84.53 Vested (52,822 ) 60.06 $ 4,493 Forfeited (22,058 ) 69.46 Unvested as of December 31, 2017 320,103 $ 69.36 Granted 120,173 83.87 Vested (110,231 ) 59.41 $ 9,081 Forfeited (15,558 ) 73.82 Unvested as of December 31, 2018 1 314,487 $ 78.17 1 As of December 31, 2018 , 38,560 shares were unvested from service-based grants. Restricted Stock Units There were no RSUs granted during 2018 and 2017 . During 2016 , the Company granted RSUs payable solely in cash. The RSUs vest over periods ranging from three to four years from the date of grant and are subject to forfeiture until performance and employment targets are achieved. Upon vesting, the RSUs are converted to cash based on the closing stock price on the vesting date. Total recognized compensation expense related to the RSUs was $0.6 million , $3.4 million , and $5.9 million for the years ended December 31, 2018 , 2017 , and 2016 , respectively. The following table presents the activity for RSU: Number of Units Weighted Average Fair Value of Restricted Balance as of December 31, 2015 135,505 $ 55.86 Granted 58,541 63.92 Vested (31,660 ) 55.17 $ 1,897 Forfeited (7,554 ) 56.08 Balance as of December 31, 2016 154,832 $ 59.04 Vested (29,281 ) 58.74 $ 2,516 Forfeited (9,062 ) 60.17 Balance as of December 31, 2017 116,489 $ 60.22 Vested (62,252 ) 57.00 $ 5,127 Forfeited (2,173 ) 63.92 Balance as of December 31, 2018 52,064 $ 63.92 Stock Options There were no stock options granted for the years ended December 31, 2018 , 2017 , and 2016 . All stock options granted were fully vested prior to December 31, 2016 . The Company reissues treasury stock to satisfy stock option exercises. The following table presents the activity related to stock options under all plans for the year ended December 31, 2018 : Stock Weighted Weighted Aggregate Stock Options Outstanding as of January 1, 2018 303,552 $ 45.26 Exercised (39,664 ) 45.16 Stock Options Outstanding as of December 31, 2018 263,888 45.27 3.0 $ 5,818 Stock Options Vested and Exercisable as of December 31, 2018 263,888 45.27 3.0 5,818 The following summarizes certain stock option activity of the Company for the years ended December 31, 2018 , 2017 , and 2016 : (dollars in thousands) 2018 2017 2016 Intrinsic Value of Stock Options Exercised $ 1,634 $ 5,991 $ 1,990 Cash Received from Stock Options Exercised 1,791 7,502 3,546 Tax Benefits Realized from Stock Options Exercised 240 2,003 384

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Provision for Income Taxes The components of the Company’s provision for income taxes for the years ended December 31, 2018 , 2017 , and 2016 were as follows: (dollars in thousands) 2018 2017 2016 Current: Federal $ 45,464 $ 73,176 $ 69,061 State 11,434 6,039 1,885 Total Current 56,898 79,215 70,946 Deferred: Federal (2,172 ) 5,042 6,947 State (4,102 ) (865 ) 240 Total Deferred (6,274 ) 4,177 7,187 Provision for Income Taxes $ 50,624 $ 83,392 $ 78,133 The tax effects of fair value adjustments on available-for-sale investment securities, the amortization of unrealized gains and losses related to investment securities transferred to held-to-maturity, and the minimum pension liability adjustment are recorded directly to consolidated shareholders’ equity. The Company elected to adopt ASU No. 2016-09 “Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” in the first quarter of 2017, which requires the Company to record excess tax benefits related to stock options as a reduction of the provision for income taxes, whereas they were previously recognized in equity. The net tax benefit recorded directly to consolidated shareholders’ equity was $3.2 million , $0.5 million , and $7.9 million for the years ended December 31, 2018 , 2017 , and 2016 , respectively. Deferred Tax Liabilities and Assets As of December 31, 2018 and 2017 , significant components of the Company’s deferred tax liabilities and assets were as follows: December 31, (dollars in thousands) 2018 2017 Deferred Tax Liabilities: Accelerated Depreciation $ (2,864 ) $ — Accrued Pension Cost (11,270 ) (11,245 ) Federal Home Loan Bank Stock (3,416 ) (3,408 ) Lease Transactions (53,230 ) (57,458 ) Energy Tax Credits (5,274 ) (8,821 ) Investment in Variable Interest Entities (3,769 ) (3,407 ) Deferred Loan Fees (6,688 ) (6,903 ) Originated Mortgage Servicing Rights (6,548 ) (6,646 ) Other (1,420 ) (1,883 ) Gross Deferred Tax Liabilities (94,479 ) (99,771 ) Deferred Tax Assets: Accelerated Depreciation — 1,844 Allowance for Loan Losses 30,045 30,148 Minimum Pension Liability 12,989 12,114 Accrued Expenses 14,805 9,937 Postretirement Benefit Obligations 8,396 8,595 Capital Lease Expenses 2,172 2,168 Restricted Stock 5,178 6,223 Net Unrealized Losses on Investments Securities 5,421 3,059 Deductible State and Local Taxes 3,242 2,461 Other 4,244 5,183 Gross Deferred Tax Assets Before Valuation Allowance 86,492 81,732 Valuation Allowance (1,102 ) (955 ) Gross Deferred Tax Assets After Valuation Allowance 85,390 80,777 Net Deferred Tax Liabilities $ (9,089 ) $ (18,994 ) Accounting Standards Codification (ASC) 740, Income Taxes, requires the effects of changes in tax rates and laws on deferred tax balances to be recognized in the period in which the legislation is enacted. Since the Tax Cuts and Jobs Act was enacted on December, 22 2017, the Company revalued and adjusted its deferred taxes by recording an additional $3.6 million tax expense in December 2017. The Company’s deferred tax balances as of December 31, 2017 and December 31, 2018 are based on the 21% federal tax rate which is expected to be in effect during the periods in which the temporary differences reverse. Both positive and negative evidence was considered by management in determining the need for a valuation allowance. Negative evidence included the uncertainty regarding the generation of capital gains in future years and restrictions on the ability to sell low-income housing investments during periods when carrybacks of capital losses are allowed. Positive evidence included capital gains in the carryback years. After considering all available evidence, management determined that a valuation allowance to offset deferred tax assets related to low-income housing investments that can only be used to offset capital gains was appropriate. Management determined that a valuation allowance was not required for the remaining deferred tax assets because it is more likely than not these assets will be realized through future reversals of existing taxable temporary difference and future taxable income exclusive of reversing temporary differences. The Tax Act prohibits the carryback of net operating losses (NOLs) generated in tax year ending after December 31, 2017. This eliminated consideration of taxable income in prior carryback years as an income source for prospective NOLs. Certain events covered by Internal Revenue Code Section 593(e) will trigger a recapture of base year reserves of acquired thrift institutions. The base year reserves of acquired thrift institutions would be recaptured if an entity ceases to qualify as a bank for federal income tax purposes. The base year reserves of thrift institutions also remain subject to income tax penalty provisions that, in general, require recapture upon certain stock redemptions of, and excess distributions to, shareholders. As of December 31, 2018 , retained earnings included $18.2 million of base year reserves for which the deferred federal income tax liability of $4.8 million has not been recognized. Effective Tax Rate The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended December 31, 2018 , 2017 , and 2016 : 2018 2017 2016 Statutory Federal Income Tax Rate 21.00 % 35.00 % 35.00 % Increase (Decrease) in Income Tax Rate Resulting From: State Taxes, Net of Federal Income Tax 2.29 1.50 0.60 Tax Reserve Adjustments 0.21 0.09 (0.18 ) Low-Income Housing Investments 0.22 (1.18 ) (0.69 ) Investment Tax Credits (1.04 ) (1.03 ) (0.85 ) Bank-Owned Life Insurance (0.55 ) (0.85 ) (0.88 ) Tax-Exempt Income (1.29 ) (2.57 ) (2.71 ) Excess Tax Benefits - Stock Compensation (0.34 ) (0.83 ) — Leveraged Lease (0.83 ) (0.03 ) (0.13 ) Tax Reform Effects (0.75 ) 1.25 — Other (0.19 ) (0.24 ) (0.06 ) Effective Tax Rate 18.73 % 31.11 % 30.10 % The Tax Cuts and Jobs Act changed the corporate tax rate from 35% to 21%, effective January 1, 2018. The impact on deferred tax assets and liabilities was recognized as an additional income tax expense of $3.6 million in the fourth quarter of 2017, when the act was signed into law. Unrecognized Tax Benefits The Company is required to record a liability, referred to as an unrecognized tax benefit (“UTB”), for the entire amount of benefit taken in a prior or future income tax return when the Company determines that a tax position has a less than 50% likelihood of being accepted by the taxing authority. The following presents a reconciliation of the Company’s liability for UTBs for the years ended December 31, 2018 , 2017 , and 2016 : (dollars in thousands) 2018 2017 2016 Unrecognized Tax Benefits at Beginning of Year $ 5,292 $ 6,574 $ 11,602 Gross Increases, Related to Tax Positions Taken in a Prior Period 157 273 145 Gross Decreases, Related to Tax Positions Taken in a Prior Period — — (230 ) Gross Increases, Related to Current Period Tax Positions 885 1,124 395 Settlement with Taxing Authority — — (1,002 ) Lapse of Statute of Limitations (793 ) (2,679 ) (4,336 ) Unrecognized Tax Benefits at End of Year $ 5,541 $ 5,292 $ 6,574 As of December 31, 2018 and 2017 , $5.5 million and $5.3 million , respectively, in liabilities for UTBs was related to UTBs that if reversed would have an impact on the Company’s effective tax rate. Management believes that it is reasonably possible that the Company’s liability for UTBs could further decrease as a result of the expiration of statutes of limitations within the next 12 months. However, management is currently not able to estimate a range of possible change in the amount of the liability for UTBs recorded as of December 31, 2018 . The Company classifies interest and penalties, if any, related to the liability for UTBs as a component of the provision for income taxes. For the years ended December 31, 2018 , 2017 , and 2016 , the Company recorded a net tax benefit of less than $0.1 million , $0.1 million , and $1.1 million , respectively, for interest and penalties. As of December 31, 2018 and 2017 , the Company had accrued $0.9 million , respectively, for the payment of possible interest and penalties. The federal tax returns for 2015 through 2017 remain subject to examination. The company is currently under audit for tax year 2016. The Company's State of Hawaii income tax returns for 2015 through 2017 remain subject to examination by the taxing authorities.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The notional amount and fair value of the Company’s derivative financial instruments as of December 31, 2018 and 2017 were as follows: December 31, 2018 December 31, 2017 (dollars in thousands) Notional Amount Fair Value Notional Amount Fair Value Interest Rate Lock Commitments $ 33,133 $ 871 $ 35,422 $ 789 Forward Commitments 34,102 (352 ) 45,143 (56 ) Interest Rate Swap Agreements Receive Fixed/Pay Variable Swaps 505,034 (2,537 ) 374,670 (1,331 ) Pay Fixed/Receive Variable Swaps 505,034 6,082 374,670 1,436 Foreign Exchange Contracts 55,663 793 54,332 (13 ) Conversion Rate Swap Agreement 80,746 — 70,571 — The following table presents the Company’s derivative financial instruments, their fair values, and their location in the consolidated statements of condition as of December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Derivative Financial Instruments Not Designated 1 (dollars in thousands) Asset Liability Asset Liability Interest Rate Lock Commitments $ 877 $ 6 $ 789 $ — Forward Commitments 4 356 14 70 Interest Rate Swap Agreements 12,915 9,370 9,583 9,478 Foreign Exchange Contracts 808 15 132 145 Total $ 14,604 $ 9,747 $ 10,518 $ 9,693 1 Asset derivatives are included in other assets and liability derivatives are included in other liabilities in the consolidated statements of condition. The following table presents the Company’s derivative financial instruments and the amount and location of the net gains or losses recognized in the consolidated statements of income for the years ended December 31, 2018 , 2017 , and 2016 : Location of Net Gains (Losses)Recognized in the Year Ended December 31, Derivative Financial Instruments Not Designated (dollars in thousands) 2018 2017 2016 Interest Rate Lock Commitments Mortgage Banking $ 3,534 $ 5,643 $ 7,834 Forward Commitments Mortgage Banking 821 (1,275 ) 1,741 Interest Rate Swap Agreements Other Noninterest Income 1,835 698 2,987 Foreign Exchange Contracts Other Noninterest Income 3,163 3,296 2,962 Conversion Rate Swap Agreement Investment Securities Gains (Losses), Net (1,000 ) — — Total $ 8,353 $ 8,362 $ 15,524 Management has received authorization from the Bank’s Board of Directors to use derivative financial instruments as an end-user in connection with the Bank’s risk management activities and to accommodate the needs of the Bank’s customers. As with any financial instrument, derivative financial instruments have inherent risks. Market risk is defined as the risk of adverse financial impact due to fluctuations in interest rates, foreign exchange rates, and equity prices. Market risks associated with derivative financial instruments are balanced with the expected returns to enhance earnings performance and shareholder value, while limiting the volatility of each. The Company uses various processes to monitor its overall market risk exposure, including sensitivity analysis, value-at-risk calculations, and other methodologies. Derivative financial instruments are also subject to credit and counterparty risk, which is defined as the risk of financial loss if a borrower or counterparty is either unable or unwilling to repay borrowings or settle transactions in accordance with the underlying contractual terms. Credit and counterparty risks associated with derivative financial instruments are similar to those relating to traditional financial instruments. The Company manages derivative credit and counterparty risk by evaluating the creditworthiness of each borrower or counterparty, adhering to the same credit approval process used for commercial lending activities. As of December 31, 2018 and 2017 , the Company did not designate any derivative financial instruments as formal hedging relationships. The Company’s free-standing derivative financial instruments are required to be carried at their fair value on the Company’s consolidated statements of condition. These financial instruments have been limited to interest rate lock commitments (“IRLCs”), forward commitments, interest rate swap agreements, foreign exchange contracts, and conversion rate swap agreements. The Company enters into IRLCs for residential mortgage loans which commit us to lend funds to a potential borrower at a specific interest rate and within a specified period of time. IRLCs that relate to the origination of mortgage loans that will be held for sale are considered derivative financial instruments under applicable accounting guidance. Outstanding IRLCs expose the Company to the risk that the price of the mortgage loans underlying the commitments may decline due to increases in mortgage interest rates from inception of the rate lock to the funding of the loan. To mitigate this risk, the Company utilizes forward commitments as economic hedges against the potential decreases in the values of the loans held for sale. IRLCs and forward commitments are free-standing derivatives which are carried at fair value with changes recorded in the mortgage banking component of noninterest income in the Company’s consolidated statements of income. The Company enters into interest rate swap agreements to facilitate the risk management strategies of a small number of commercial banking customers. The Company mitigates the interest rate risk of entering into these agreements by entering into equal and offsetting interest rate swap agreements with highly rated third party financial institutions. The interest rate swap agreements are free-standing derivatives and are recorded at fair value in the Company’s consolidated statements of condition. Fair value changes are recorded in other noninterest income in the Company’s consolidated statements of income. The Company is party to master netting arrangements with its financial institution counterparties; however, the Company does not offset assets and liabilities under these arrangements for financial statement presentation purposes. Collateral, usually in the form of cash or marketable securities, is posted by the counterparty with net liability positions in accordance with contract thresholds. See Note 19 Balance Sheet Offsetting for more information. The Company’s interest rate swap agreements with financial institution counterparties may contain credit-risk-related contingent features tied to a specified credit rating of the Company. Under these provisions, should the Company’s specified rating fall below a particular level (e.g., investment grade), or if the Company no longer obtains the specified rating, the counterparty may require the Company to pledge collateral on an immediate and ongoing basis (subject to the requirement that such swaps are in a net liability position beyond the level specified in the contract), or require immediate settlement of the swap agreement. Other credit-risk-related contingent features may also allow the counterparty to require immediate settlement of the swap agreement if the Company fails to maintain a specified minimum level of capitalization. With regard to derivative contracts not centrally cleared through a clearinghouse, regulations require collateral to be posted by the party with a net liability position (i.e., the threshold for posting collateral was reduced to zero, subject to certain minimum transfer amounts). The requirements generally applied to new derivative contracts entered into by the Company after March 1, 2017, although certain counterparties may elect to apply lower thresholds to existing contracts. Parties to a centrally cleared over-the-counter derivative exchange daily payments that reflect the daily change in value of the derivative. These payments are commonly referred to as variation margin. Historically, variation margin payments have typically been treated as collateral against the derivative position. Effective 2017, the Chicago Mercantile Exchange and LCH.Clearnet Limited (collectively, the “clearinghouses”) amended their rulebooks to legally characterize variation margin payments for over-the-counter derivatives they clear as settlements of the derivatives’ mark-to-market exposure rather than collateral against the exposures. This rule change effectively results in any derivative cleared through the clearinghouses to have a fair value that approximates zero on a daily basis. During the second quarter of 2017, the Company executed its first swap agreements cleared through the clearinghouses. As of December 31, 2018 , the application of the rule change reduced the swap agreement liability by $3.9 million , as reflected in the table above. Going forward, the Company expects most of the swap agreements executed with third party financial institutions will be required to be cleared through the clearinghouses. The uncleared swap agreements executed with third party financial institutions will remain subject to the collateral requirements and credit-risk-related contingent features described in the previous paragraphs, and therefore, are not subject to the variation margin rule change. Likewise, the swap agreements executed with the Company’s commercial banking customers will remain uncleared and will also not be subject to the variation margin rule change. The Company utilizes foreign exchange contracts to offset risks related to transactions executed on behalf of customers. The foreign exchange contracts are free-standing derivatives which are carried at fair value with changes included in other noninterest income in the Company’s consolidated statements of income. As each sale of Visa Class B restricted shares was completed, the Company entered into a conversion rate swap agreement with the buyer that requires payment to the buyer in the event Visa further reduces the conversion ratio of Class B into Class A unrestricted common shares. In the event of Visa increasing the conversion ratio, the buyer would be required to make payment to the Company. In June 2018, Visa announced a reduction of the conversion ratio from 1.6483 to 1.6298 effective June 28, 2018. As a result, the Company recorded a $1.0 million liability in June 2018 which represents the amount paid to the buyers of the Visa Class B shares in July 2018. As of December 31, 2018 , the conversion rate swap agreement was valued at zero (i.e., no contingent liability recorded) as further reductions to the conversion ratio were deemed neither probable nor reasonably estimable by management. See Note 3 Investment Securities for more information.

Affordable Housing Projects Tax

Affordable Housing Projects Tax Credit Partnerships Affordable Housing Projects Tax Credit Partnerships	12 Months Ended
	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Affordable Housing Projects Tax Credit Partnerships	Affordable Housing Projects Tax Credit Partnerships The Company makes equity investments in various limited partnerships that sponsor affordable housing projects utilizing the Low Income Housing Tax Credit (LIHTC) pursuant to Section 42 of the Internal Revenue Code. The purpose of these investments is to achieve a satisfactory return on capital, to facilitate the sale of affordable housing product offerings, and to assist in achieving goals associated with the Community Reinvestment Act. The primary activities of the limited partnerships include the identification, development, and operation of multi-family housing that is leased to qualifying residential tenants. Generally, these types of investments are funded through a combination of debt and equity. The Company is a limited partner in each LIHTC limited partnership. Each limited partnership is managed by an unrelated third party general partner who exercises full control over the affairs of the limited partnership. The general partner has all the rights, powers and authority granted or permitted to be granted to a general partner of a limited partnership. Duties entrusted to the general partner of each limited partnership include, but are not limited to: investment in operating companies, company expenditures, investment of excess funds, borrowing funds, employment of agents, disposition of fund property, prepayment and refinancing of liabilities, votes and consents, contract authority, disbursement of funds, accounting methods, tax elections, bank accounts, insurance, litigation, cash reserve, and use of working capital reserve funds. Except for limited rights granted to the limited partner(s) relating to the approval of certain transactions, the limited partner(s) may not participate in the operation, management, or control of the limited partnership’s business, transact any business in the limited partnership’s name or have any power to sign documents for or otherwise bind the limited partnership. In addition, the general partner may only be removed by the limited partner(s) in the event the general partner fails to comply with the terms of the agreement or is negligent in performing its duties. The general partner of each limited partnership has both the power to direct the activities which most significantly affect the performance of each partnership and the obligation to absorb losses or the right to receive benefits that could be significant to the entities. Therefore, the Company has determined that it is not the primary beneficiary of any LIHTC partnership. The Company uses the effective yield method to account for its pre-2015 investments in these entities. Beginning January 1, 2015, any new investments that meet the requirements of the proportional amortization method are recognized using the proportional amortization method. The Company’s net affordable housing tax credit investments and related unfunded commitments were $73.7 million and $71.7 million as of December 31, 2018 and 2017 , respectively, and are included in other assets in the consolidated statements of condition. Unfunded Commitments As of December 31, 2018 , the expected payments for unfunded affordable housing commitments were as follows: (dollars in thousands) Amount 2019 $ 5,506 2020 8,350 2021 61 2022 121 2023 42 Thereafter 1,118 Total Unfunded Commitments $ 15,198 The following table presents tax credits and other tax benefits recognized and amortization expense related to affordable housing for the years ended December 31, 2018 , 2017 , and 2016 . (dollars in thousands) 2018 2017 2016 Effective Yield Method Tax credits and other tax benefits recognized $ 13,572 $ 13,569 $ 13,996 Amortization Expense in Provision for Income Taxes 8,311 8,373 7,886 Proportional Amortization Method Tax credits and other tax benefits recognized $ 1,641 $ 1,040 $ — Amortization Expense in Provision for Income Taxes 1,332 800 — There were no impairment losses related to LIHTC investments for the years ended December 31, 2018 , 2017 , and 2016 .

Balance Sheet Offsetting

Balance Sheet Offsetting	12 Months Ended
	Dec. 31, 2018
Offsetting [Abstract]
Balance Sheet Offsetting	Balance Sheet Offsetting Interest Rate Swap Agreements (“Swap Agreements”) The Company enters into swap agreements to facilitate the risk management strategies of a small number of commercial banking customers. The Company mitigates the risk of entering into these agreements by entering into equal and offsetting swap agreements with highly-rated third party financial institutions. The swap agreements are free-standing derivatives and are recorded at fair value in the Company’s consolidated statements of condition (asset positions are included in other assets and liability positions are included in other liabilities). The Company is party to master netting arrangements with its financial institution counterparties; however, the Company does not offset assets and liabilities under these arrangements for financial statement presentation purposes. The master netting arrangements provide for a single net settlement of all swap agreements, as well as collateral, in the event of default on, or termination of, any one contract. Collateral, usually in the form of marketable securities, is posted by the party (i.e., the Company or the financial institution counterparty) with net liability positions in accordance with contract thresholds. The Company had a net liability positions with its financial institution counterparties totaling $0.3 million and $3.2 million as of December 31, 2018 and 2017 , respectively. See Note 17 Derivative Financial Instruments for more information. Parties to a centrally cleared over-the-counter derivative exchange daily payments that reflect the daily change in value of the derivative. Effective 2017, these payments, commonly referred to as variation margin, will be recorded as settlements of the derivatives’ mark-to-market exposure rather than collateral against the exposures. This rule change effectively results in any centrally cleared derivative having a fair value that approximates zero on a daily basis, and therefore, these swap agreements were not included in the offsetting table at the end of this section. See Note 17 Derivative Financial Instruments for more information. Securities Sold Under Agreements to Repurchase (“Repurchase Agreements”) The Company enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Company may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Company to repurchase the assets. As a result, these repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as sales and subsequent repurchases of securities. The obligation to repurchase the securities is reflected as a liability in the Company’s consolidated statements of condition, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts. As a result, there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities. In addition, as the Company does not enter into reverse repurchase agreements, there is no such offsetting to be done with the repurchase agreements. The right of setoff for a repurchase agreement resembles a secured borrowing, whereby the collateral pledged by the Company would be used to settle the fair value of the repurchase agreement should the Company be in default (e.g., fail to make an interest payment to the counterparty). For private institution repurchase agreements, if the private institution counterparty were to default (e.g., declare bankruptcy), the Company could cancel the repurchase agreement (i.e., cease payment of principal and interest) and attempt collection on the amount of collateral value in excess of the repurchase agreement fair value. The collateral is held by a third party financial institution in the counterparty’s custodial account. The counterparty has the right to sell or repledge the investment securities. For government entity repurchase agreements, the collateral is held by the Company in a segregated custodial account under a tri-party agreement. The Company is required by the counterparty to maintain adequate collateral levels. In the event the collateral fair value falls below stipulated levels, the Company will pledge additional securities. The Company closely monitors collateral levels to ensure adequate levels are maintained, while mitigating the potential risk of over-collateralization in the event of counterparty default. The following table presents the remaining contractual maturities of the Company’s repurchase agreements as of December 31, 2018 and 2017 , disaggregated by the class of collateral pledged. Remaining Contractual Maturity of Repurchase Agreements (dollars in thousands) Up to 91-365 days 1-3 Years After Total December 31, 2018 Class of Collateral Pledged: Debt Securities Issued by the U.S. Treasury and Government Agencies $ — $ — $ 198,442 $ 117,021 $ 315,463 Debt Securities Issued by States and Political Subdivisions 1,906 1,590 — — 3,496 Mortgage-Backed Securities: Residential - Government Agencies 800 — 26,558 70,341 97,699 Residential - U.S. Government-Sponsored Enterprises — — — 87,638 87,638 Total $ 2,706 $ 1,590 $ 225,000 $ 275,000 $ 504,296 December 31, 2017 Class of Collateral Pledged: Debt Securities Issued by the U.S. Treasury and Government Agencies $ — $ — $ 110,392 $ 202,484 $ 312,876 Debt Securities Issued by States and Political Subdivisions 1,200 2,590 — — 3,790 Mortgage-Backed Securities: Residential - Government Agencies 1,503 — 18,793 80,960 101,256 Residential - U.S. Government-Sponsored Enterprises — — 20,815 66,556 87,371 Total $ 2,703 $ 2,590 $ 150,000 $ 350,000 $ 505,293 The following table presents the assets and liabilities subject to an enforceable master netting arrangement, or repurchase agreements, as of December 31, 2018 and 2017 . The swap agreements we have with our commercial banking customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table. As previously mentioned, centrally cleared swap agreements between the Company and institutional counterparties are also excluded from this table. (i) (ii) (iii) = (i)-(ii) (iv) (v) = (iii)-(iv) Gross Amounts Recognized in the Statements of Condition Gross Amounts Offset in the Statements of Condition Net Amounts Presented in the Statements of Condition Gross Amounts Not Offset in the Statements of Condition (dollars in thousands) Netting Adjustments per Master Netting Arrangements Fair Value of Collateral Pledged 1 Net Amount December 31, 2018 Assets: Interest Rate Swap Agreements: Institutional Counterparties $ 7,572 $ — $ 7,572 $ 1,490 $ — $ 6,082 Liabilities: Interest Rate Swap Agreements: Institutional Counterparties 1,490 — 1,490 1,490 — — Repurchase Agreements: Private Institutions 500,000 — 500,000 — 500,000 — Government Entities 4,296 — 4,296 — 4,296 — Total Repurchase Agreements $ 504,296 $ — $ 504,296 $ — $ 504,296 $ — December 31, 2017 Assets: Interest Rate Swap Agreements: Institutional Counterparties $ 5,453 $ — $ 5,453 $ 4,017 $ — $ 1,436 Liabilities: Interest Rate Swap Agreements: Institutional Counterparties 4,017 — 4,017 4,017 — — Repurchase Agreements: Private Institutions 500,000 — 500,000 — 500,000 — Government Entities 5,293 — 5,293 — 5,293 — Total Repurchase Agreements $ 505,293 $ — $ 505,293 $ — $ 505,293 $ — 1 The application of collateral cannot reduce the net amount below zero. Therefore, excess collateral is not reflected in this table. For swap agreements with institutional counterparties, the fair value of investment securities pledged was less than $0.1 million and $3.5 million as of December 31, 2018 and 2017 , respectively. For repurchase agreements with private institutions, the fair value of investment securities pledged was $526.7 million and $563.3 million as of December 31, 2018 and 2017 , respectively. For repurchase agreements with government entities, the fair value of investment securities pledged was $6.8 million and $6.9 million as of December 31, 2018 and 2017 , respectively.

Commitments, Contingencies, and

Commitments, Contingencies, and Guarantees	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments, Contingencies, and Guarantees The Company’s credit commitments as of December 31, 2018 were as follows: (dollars in thousands) December 31, 2018 Unfunded Commitments to Extend Credit $ 2,646,085 Standby Letters of Credit 62,344 Commercial Letters of Credit 9,411 Total $ 2,717,840 Unfunded Commitments to Extend Credit Commitments to extend credit are agreements to lend to a customer as long as there is no violation of the terms or conditions established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since commitments may expire without being drawn, the total commitment amount does not necessarily represent future cash requirements. Standby and Commercial Letters of Credit Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. Standby letters of credit generally become payable upon the failure of the customer to perform according to the terms of the underlying contract with the third party, while commercial letters of credit are issued specifically to facilitate commerce and typically result in the commitment being drawn on when the underlying transaction is consummated between the customer and a third party. The contractual amount of these letters of credit represents the maximum potential future payments guaranteed by the Company. The Company has recourse against the customer for any amount it is required to pay to a third party under a standby letter of credit, and generally holds cash or deposits as collateral on those standby letters of credit for which collateral is deemed necessary. Assets valued at $38.9 million secured certain specifically identified standby letters of credit as of December 31, 2018 . As of December 31, 2018 , the standby and commercial letters of credit had remaining terms ranging from 1 to 14 months. Lease Commitments A portion of the Company’s headquarters’ building is leased with a lease term through 2052. The Company leases certain other branch premises and equipment with lease terms extending through 2048. Most of the leases for premises provide for a base rent over a specified period with renewal options thereafter. Portions of certain properties are subleased for periods expiring in various years through 2033. Lease terms generally specify that the Company is to pay for taxes, maintenance, and other operating costs. Rental expense for all operating leases for the years ended December 31, 2018 , 2017 , and 2016 were as follows: (dollars in thousands) 2018 2017 2016 Minimum Rentals $ 19,326 $ 18,331 $ 18,377 Sublease Rental Income (7,674 ) (7,056 ) (6,551 ) Total $ 11,652 $ 11,275 $ 11,826 Future minimum payments for capital leases and non-cancelable operating leases with initial or remaining terms of one year or more consisted of the following as of December 31, 2018 : (dollars in thousands) Capital Leases Operating Leases 2019 $ 825 $ 12,455 2020 825 11,266 2021 825 11,025 2022 825 10,416 2023 825 9,482 Thereafter 23,930 104,877 Total Future Minimum Lease Payments 28,055 $ 159,521 Amounts Representing Interest (17,412 ) Present Value of Net Future Minimum Lease Payments $ 10,643 Minimum future rental income receivable under non-cancelable subleases was $12.7 million as of December 31, 2018 . Contingencies The Company, along with other members of Visa, are parties to Loss and Judgment Sharing Agreements (the “Agreements”), which provide that the Company along with other member banks of Visa, will share, based on its proportionate interest in Visa, in any losses from certain litigation specified in the Agreements. In March 2008, Visa funded an escrow account from its initial public offering to settle claims covered under the Agreements. In connection with the initial public offering, the Company received restricted Class B common stock in Visa. Should the escrow account established by Visa not be sufficient to cover litigation claims specified in the Agreements, Visa is entitled to fund additional amounts to the escrow account by reducing each member bank’s Class B conversion ratio to unrestricted Class A shares. As of December 31, 2018 , management believes that the Company’s indemnification of Visa, related to the costs of these lawsuits, will be sufficiently funded from the escrow account or through future reductions in the conversion ratio. See Note 3 Investment Securities and Note 17 Derivative Financial Instruments for more information. On September 9, 2016, a purported class action lawsuit was filed by a Bank customer primarily alleging Bank of Hawaii’s practice of determining whether consumer deposit accounts were overdrawn based on “available balance” (which deducts debit card transactions that have taken place but which have not yet been posted) was not properly applied or disclosed to customers. Additionally, on January 20, 2017, another purported class action lawsuit was filed by a Bank customer alleging Bank of Hawaii’s practice of assessing a continuous negative balance overdraft fee on accounts remaining in a negative balance for extended periods of time beyond the date of the initial overdraft constituted a usurious interest charge and a breach of contract with the customer. These lawsuits are similar to lawsuits filed against other financial institutions pertaining to available balance overdraft fee disclosures and continuing negative balance overdraft fees. Because of the many questions of fact and law that may arise in the future, the outcome of these legal proceedings are uncertain at this point. This is because, among other things, our potential liability depends on whether a class is certified and, if so, the composition and size of any such class, the applicable time period at issue, as well as an assessment of the appropriate measure of damages if we were to be found liable. Management disputes any wrongdoing and the cases are being vigorously defended. In addition to the litigation noted above, the Company is subject to various other pending and threatened legal proceedings arising out of the normal course of business or operations. On at least a quarterly basis, the Company assesses its liabilities and contingencies in connection with outstanding legal proceedings utilizing the most recent information available. On a case-by-case basis, reserves are established for those legal claims for which it is probable that a loss will be incurred and the amount of such loss can be reasonably estimated. Based on information currently available, management believes that the eventual outcome of these claims against the Company will not be materially in excess of such amounts reserved by the Company. However, in the event of unexpected future developments, it is possible that the ultimate resolution of these matters may result in a loss that materially exceeds the reserves established by the Company. Risks Related to Representation and Warranty Provisions The Company sells residential mortgage loans in the secondary market primarily to the Fannie Mae. The Company also pools FHA insured and VA guaranteed residential mortgage loans for sale to Ginnie Mae. These pools of FHA-insured and VA-guaranteed residential mortgage loans are securitized by Ginnie Mae. The agreements under which the Company sells residential mortgage loans to Fannie Mae or Ginnie Mae and the insurance or guaranty agreements with FHA and VA contain provisions that include various representations and warranties regarding the origination and characteristics of the residential mortgage loans. Although the specific representations and warranties vary among investors, insurance or guarantee agreements, they typically cover ownership of the loan, validity of the lien securing the loan, the absence of delinquent taxes or liens against the property securing the loan, compliance with loan criteria set forth in the applicable agreement, compliance with applicable federal, state, and local laws, and other matters. As of December 31, 2018 , the unpaid principal balance of residential mortgage loans sold by the Company was $2.7 billion . The agreements under which the Company sells residential mortgage loans require delivery of various documents to the investor or its document custodian. Although these loans are primarily sold on a non-recourse basis, the Company may be obligated to repurchase residential mortgage loans or reimburse investors for losses incurred if a loan review reveals that underwriting and documentation standards were potentially not met. Some agreements may require the Company to repurchase delinquent loans. Upon receipt of a repurchase request, the Company works with investors or insurers to arrive at a mutually agreeable resolution. Repurchase demands are typically reviewed on an individual loan by loan basis to validate the claims made by the investor or insurer and to determine if a contractually required repurchase event has occurred. The Company manages the risk associated with potential repurchases or other forms of settlement through its underwriting and quality assurance practices and by servicing mortgage loans to meet investor and secondary market standards. For the year ended December 31, 2018 , the Company repurchased seven residential mortgage loans with an aggregate unpaid principal balance totaling $1.9 million as a result of the representation and warranty provisions contained in these contracts. The loans were delinquent as to principal and interest at the time of repurchase, however, no material losses were incurred related to these repurchases. As of December 31, 2018 , there were no pending repurchase requests related to representation and warranty provisions. Risks Relating to Residential Mortgage Loan Servicing Activities In addition to servicing loans in the Company’s portfolio, substantially all of the loans the Company sells to investors are sold with servicing rights retained. The Company also services loans originated by other mortgage loan originators. As servicer, the Company’s primary duties are to: (1) collect payments due from borrowers; (2) advance certain delinquent payments of principal and interest; (3) maintain and administer any hazard, title, or primary mortgage insurance policies relating to the mortgage loans; (4) maintain any required escrow accounts for payment of taxes and insurance and administer escrow payments; and (5) foreclose on defaulted mortgage loans or, to the extent consistent with the documents governing a securitization, consider alternatives to foreclosure, such as loan modifications or short sales. Each agreement under which the Company acts as servicer generally specifies a standard of responsibility for actions taken by the Company in such capacity and provides protection against expenses and liabilities incurred by the Company when acting in compliance with the respective servicing agreements. However, if the Company commits a material breach of obligations as servicer, the Company may be subject to termination if the breach is not cured within a specified period following notice. The standards governing servicing and the possible remedies for violations of such standards vary by investor. These standards and remedies are determined by servicing guides issued by the investors as well as the contract provisions established between the investors and the Company. Remedies could include repurchase of an affected loan. For the year ended December 31, 2018 , the Company had no repurchase requests related to loan servicing activities. As of December 31, 2018 , there were no pending repurchase requests related to loan servicing activities. Although to date repurchase requests related to representation and warranty provisions, and servicing activities have been limited, it is possible that requests to repurchase mortgage loans may increase in frequency as investors more aggressively pursue all means of recovering losses on their purchased loans. However, as of December 31, 2018 , management believes that this exposure is not material due to the historical level of repurchase requests and loss trends and thus has not established a liability for losses related to mortgage loan repurchases. As of December 31, 2018 , 99% of the Company’s residential mortgage loans serviced for investors were current. The Company maintains ongoing communications with investors and continues to evaluate this exposure by monitoring the level and number of repurchase requests as well as the delinquency rates in the loans sold to investors.

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities The following is a description of the valuation methodologies and key inputs used to measure assets and liabilities recorded at fair value on a recurring basis. Assets and Liabilities Measured at Fair Value on a Recurring Basis Investment Securities Available-for-Sale Fair values of investment securities available-for-sale were primarily measured using information from a third-party pricing service. This service provides pricing information by utilizing evaluated pricing models supported with market data information. Standard inputs include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data from market research publications. Level 1 investment securities are comprised of debt securities issued by the U.S. Treasury, as quoted prices were available, unadjusted, for identical securities in active markets. Level 2 investment securities were primarily comprised of debt securities issued by the Small Business Administration, states and municipalities, corporations, as well as mortgage-backed securities issued by government agencies and government-sponsored enterprises. Fair values were estimated primarily by obtaining quoted prices for similar assets in active markets or through the use of pricing models. In cases where there may be limited or less transparent information provided by the Company’s third-party pricing service, fair value may be estimated by the use of secondary pricing services or through the use of non-binding third-party broker quotes. On a quarterly basis, management reviews the pricing information received from the Company’s third-party pricing service. This review process includes a comparison to a second source. The Company’s third-party pricing service has also established processes for us to submit inquiries regarding quoted prices. Periodically, based on these reviews, the Company will challenge the quoted prices provided by the Company’s third-party pricing service. The Company’s third-party pricing service will review the inputs to the evaluation in light of the new market data presented by us. The Company’s third-party pricing service may then affirm the original quoted price or may update the evaluation on a going-forward basis. Generally, we do not adjust the price from the third-party service provider. On a quarterly basis, management also reviews a sample of securities priced by the Company’s third-party pricing service to review the significant assumptions and valuation methodologies used by the service. The information provided is comprised of market reference data, which may include reported trades; bids, offers, or broker-dealer dealer quotes; benchmark yields and spreads; as well as other reference data as appropriate. Based on this review, management determines whether the current placement of the security in the fair value hierarchy is appropriate or whether transfers may be warranted. Loans Held for Sale The fair value of the Company’s residential mortgage loans held for sale was determined based on quoted prices for similar loans in active markets, and therefore, is classified as a Level 2 measurement. Mortgage Servicing Rights Mortgage servicing rights do not trade in an active market with readily observable market data. As a result, the Company estimates the fair value of mortgage servicing rights by using a discounted cash flow model to calculate the present value of estimated future net servicing income. The Company stratifies its mortgage servicing portfolio on the basis of loan type. The assumptions used in the discounted cash flow model are those that we believe market participants would use in estimating future net servicing income. Significant assumptions in the valuation of mortgage servicing rights include estimated loan repayment rates, the discount rate, servicing costs, and the timing of cash flows, among other factors. Mortgage servicing rights are classified as Level 3 measurements due to the use of significant unobservable inputs, as well as significant management judgment and estimation. Other Assets Other assets recorded at fair value on a recurring basis are primarily comprised of investments related to deferred compensation arrangements. Quoted prices for these investments, primarily in mutual funds, are available in active markets. Thus, the Company’s investments related to deferred compensation arrangements are classified as Level 1 measurements in the fair value hierarchy. Derivative Financial Instruments Derivative financial instruments recorded at fair value on a recurring basis are comprised of interest rate lock commitments (“IRLCs”), forward commitments, interest rate swap agreements, foreign exchange contracts, and Visa Class B to Class A shares conversion rate swap agreements. The fair values of IRLCs are calculated based on the value of the underlying loan held for sale, which in turn is based on quoted prices for similar loans in the secondary market. However, this value is adjusted by a factor which considers the likelihood that the loan in a locked position will ultimately close. This factor, the closing ratio, is derived from the Bank’s internal data and is adjusted using significant management judgment. As such, IRLCs are classified as Level 3 measurements. Forward commitments are classified as Level 2 measurements as they are primarily based on quoted prices from the secondary market based on the settlement date of the contracts, interpolated or extrapolated, if necessary, to estimate a fair value as of the end of the reporting period. The fair values of interest rate swap agreements are calculated using a discounted cash flow approach and utilize Level 2 observable inputs such as a market yield curve, effective date, maturity date, notional amount, and stated interest rate. In addition, the Company includes in its fair value calculation a credit factor adjustment which is based primarily on management judgment. Thus, interest rate swap agreements are classified as a Level 3 measurement. The fair values of foreign exchange contracts are calculated using the Bank’s multi-currency accounting system which utilizes contract specific information such as currency, maturity date, contractual amount, and strike price, along with market data information such as the spot rates of specific currency and yield curves. Foreign exchange contracts are classified as Level 2 measurements because while they are valued using the Bank’s multi-currency accounting system, significant management judgment or estimation is not required. The fair value of the Visa Class B restricted shares to Class A unrestricted common shares conversion rate swap agreements represent the amount owed by the Company to the buyer of the Visa Class B shares as a result of a reduction of the conversion ratio subsequent to the sales date. As of December 31, 2018 and 2017 , the conversion rate swap agreements were valued at zero as reductions to the conversion ratio were neither probable nor reasonably estimable by management. See Note 17 Derivative Financial Instruments for more information. The Company is exposed to credit risk if borrowers or counterparties fail to perform. The Company seeks to minimize credit risk through credit approvals, limits, monitoring procedures, and collateral requirements. The Company generally enters into transactions with borrowers and counterparties that carry high quality credit ratings. Credit risk associated with borrowers or counterparties as well as the Company’s non-performance risk is factored into the determination of the fair value of derivative financial instruments. The table below presents the balances of assets and liabilities measured at fair value on a recurring basis as of December 31, 2018 and 2017 : (dollars in thousands) Quoted Prices Significant Significant Total December 31, 2018 Assets: Investment Securities Available-for-Sale Debt Securities Issued by the U.S. Treasury and Government Agencies $ 972 $ 391,429 $ — $ 392,401 Debt Securities Issued by States and Political Subdivisions — 563,996 — 563,996 Debt Securities Issued by U.S. Government-Sponsored Enterprises — 56 — 56 Debt Securities Issued by Corporations — 223,140 — 223,140 Mortgage-Backed Securities: Residential - Government Agencies — 190,442 — 190,442 Residential - U.S. Government-Sponsored Enterprises — 578,527 — 578,527 Commercial - Government Agencies — 59,380 — 59,380 Total Mortgage-Backed Securities — 828,349 — 828,349 Total Investment Securities Available-for-Sale 972 2,006,970 — 2,007,942 Loans Held for Sale — 10,987 — 10,987 Mortgage Servicing Rights — — 1,290 1,290 Other Assets 31,871 — — 31,871 Derivatives 1 — 812 13,792 14,604 Total Assets Measured at Fair Value on a $ 32,843 $ 2,018,769 $ 15,082 $ 2,066,694 Liabilities: Derivatives 1 $ — $ 371 $ 9,376 $ 9,747 Total Liabilities Measured at Fair Value on a $ — $ 371 $ 9,376 $ 9,747 December 31, 2017 Assets: Investment Securities Available-for-Sale Debt Securities Issued by the U.S. Treasury and Government Agencies $ 538 $ 425,392 $ — $ 425,930 Debt Securities Issued by States and Political Subdivisions — 627,019 — 627,019 Debt Securities Issued by Corporations — 266,111 — 266,111 Mortgage-Backed Securities: Residential - Government Agencies — 235,360 — 235,360 Residential - U.S. Government-Sponsored Enterprises — 609,812 — 609,812 Commercial - Government Agencies — 68,747 — 68,747 Total Mortgage-Backed Securities — 913,919 — 913,919 Total Investment Securities Available-for-Sale 538 2,232,441 — 2,232,979 Loans Held for Sale — 19,231 — 19,231 Mortgage Servicing Rights — — 1,454 1,454 Other Assets 29,230 — — 29,230 Derivatives 1 — 146 10,372 10,518 Total Assets Measured at Fair Value on a $ 29,768 $ 2,251,818 $ 11,826 $ 2,293,412 Liabilities: Derivatives 1 $ — $ 215 $ 9,478 $ 9,693 Total Liabilities Measured at Fair Value on a $ — $ 215 $ 9,478 $ 9,693 1 The fair value of each class of derivatives is shown in Note 17 Derivative Financial Instruments . For 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: (dollars in thousands) Mortgage 1 Net Derivative Assets and Liabilities 2 Year Ended December 31, 2018 Balance as of January 1, 2018 $ 1,454 $ 894 Realized and Unrealized Net Gains (Losses): Included in Net Income (164 ) 3,534 Transfers to Loans Held for Sale — (3,451 ) Variation Margin Payments — 3,439 Balance as of December 31, 2018 $ 1,290 $ 4,416 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 4,416 Year Ended December 31, 2017 Balance as of January 1, 2017 $ 1,655 $ 1,053 Realized and Unrealized Net Gains (Losses): Included in Net Income (201 ) 5,648 Transfers to Loans Held for Sale — (5,921 ) Variation Margin Payments $ — $ 114 Balance as of December 31, 2017 $ 1,454 $ 894 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 894 1 Realized and unrealized gains and losses related to mortgage servicing rights are reported as a component of mortgage banking income in the Company’s consolidated statements of income. 2 Realized and unrealized gains and losses related to interest rate lock commitments are reported as a component of mortgage banking income in the Company’s consolidated statements of income. Realized and unrealized gains and losses related to interest rate swap agreements are reported as a component of other noninterest income in the Company’s consolidated statements of income. For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of December 31, 2018 and 2017 , the significant unobservable inputs used in the fair value measurements were as follows: Significant Unobservable Inputs (weighted-average) Fair Value December 31, December 31, (dollars in thousands) Valuation Technique Description 2018 2017 2018 2017 Mortgage Servicing Rights Discounted Cash Flow Constant Prepayment Rate 1 7.01 % 8.50 % $ 30,508 $ 28,170 Discount Rate 2 9.59 % 8.87 % Net Derivative Assets and Liabilities: Interest Rate Lock Commitments Pricing Model Closing Ratio 89.00 % 93.25 % $ 871 $ 789 Interest Rate Swap Agreements Discounted Cash Flow Credit Factor 0.06 % 0.10 % $ 3,545 $ 105 1 Represents annualized loan prepayment rate assumption. 2 Derived from multiple interest rate scenarios that incorporate a spread to a market yield curve and market volatilities. The significant unobservable inputs used in the fair value measurement of the Company’s mortgage servicing rights are the weighted-average constant prepayment rate and weighted-average discount rate. Significant increases (decreases) in any of those inputs in isolation could result in a significantly lower (higher) fair value measurement. Although the constant prepayment rate and the discount rate are not directly interrelated, they generally move in opposite directions of each other. The Company estimates the fair value of mortgage servicing rights by using a discounted cash flow model to calculate the present value of estimated future net servicing income. The Company’s Treasury Division enters observable and unobservable inputs into the model to arrive at an estimated fair value. To assess the reasonableness of the fair value measurement, the Treasury Division performs a back-test by comparing the model to historical prepayment data. The Treasury Division also compares the fair value of the Company’s mortgage servicing rights to a value calculated by an independent third party. Discussions are held with members from the Treasury, Mortgage Banking, and Controllers Divisions, along with the independent third party to discuss and reconcile the fair value estimates and key assumptions used by the respective parties in arriving at those estimates. A subcommittee of the Company’s Asset/Liability Management Committee is responsible for providing oversight over the valuation methodology and key assumptions. The significant unobservable input used in the fair value measurement of the Company’s IRLCs is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. Generally, the fair value of an IRLC is positive (negative) if the prevailing interest rate is lower (higher) than the IRLC rate. Therefore, an increase in the closing ratio (i.e., higher percentage of loans are estimated to close) will increase the gain or loss. The closing ratio is largely dependent on the loan processing stage that a loan is currently in and the change in prevailing interest rates from the time of the rate lock. The closing ratio is computed by our secondary marketing system using historical data and the ratio is periodically reviewed by the Company for reasonableness. The unobservable input used in the fair value measurement of the Company’s interest rate swap agreements is the credit factor. This factor represents the risk that a counterparty is either unable or unwilling to settle a transaction in accordance with the underlying contractual terms. A significant increase (decrease) in the credit factor could result in a significantly lower (higher) fair value measurement. The credit factor is determined by the Treasury Division based on the risk rating assigned to each counterparty in which the Company holds a net asset position. The Company’s Credit Policy Committee periodically reviews and approves the Expected Default Frequency of the Economic Capital Model for Credit Risk. The Expected Default Frequency is used as the credit factor for interest rate swap agreements. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis The Company may be required periodically to measure certain assets and liabilities at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from the application of lower-of-cost-or-fair value accounting or impairment write-downs of individual assets. For the years ended December 31, 2018 and 2017 , there were no material adjustments to fair value for the Company’s assets and liabilities measured at fair value on a nonrecurring basis in accordance with GAAP. Fair Value Option The Company elects the fair value option for all residential mortgage loans held for sale. This election allows for a more effective offset of the changes in fair values of the loans held for sale and the derivative financial instruments used to financially hedge them without having to apply complex hedge accounting requirements. As noted above, the fair value of the Company’s residential mortgage loans held for sale was determined based on quoted prices for similar loans in active markets. The following table reflects the difference between the aggregate fair value and the aggregate unpaid principal balance of the Company’s residential mortgage loans held for sale as of December 31, 2018 and 2017 . (dollars in thousands) Aggregate Aggregate Aggregate Fair Value December 31, 2018 Loans Held for Sale $ 10,987 $ 10,656 $ 331 December 31, 2017 Loans Held for Sale $ 19,231 $ 18,854 $ 377 Changes in the estimated fair value of residential mortgage loans held for sale are reported as a component of mortgage banking income in the Company’s consolidated statements of income. For the years ended December 31, 2018 and 2017 , the net gains or losses from the change in fair value of the Company’s residential mortgage loans held for sale were not material. Financial Instruments Not Recorded at Fair Value on a Recurring Basis The following presents the carrying amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments not recorded at fair value on a recurring basis as of December 31, 2018 and 2017 . This table excludes financial instruments for which the carrying amount approximates fair value. For short-term financial assets such as cash and cash equivalents, the carrying amount is a reasonable estimate of fair value due to the relatively short time between the origination of the instrument and its expected realization. For non-marketable equity securities such as Federal Home Loan Bank and Federal Reserve Bank stock, the carrying amount is a reasonable estimate of fair value as these securities can only be redeemed or sold at their par value and only to the respective issuing government supported institution or to another member institution. For financial liabilities such as noninterest-bearing demand, interest-bearing demand, and savings deposits, the carrying amount is a reasonable estimate of fair value due to these products having no stated maturity. Fair Value Measurements (dollars in thousands) Carrying Amount Fair Value Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Significant December 31, 2018 Financial Instruments – Assets Investment Securities Held-to-Maturity $ 3,482,092 $ 3,413,994 $ 352,216 $ 3,061,778 $ — Loans 1 10,084,527 10,008,417 — — 10,008,417 Financial Instruments – Liabilities Time Deposits 1,745,522 1,734,447 — 1,734,447 — Securities Sold Under Agreements to Repurchase 504,296 504,288 — 504,288 — Other Debt 2 125,000 124,559 — 124,559 — December 31, 2017 Financial Instruments – Assets Investment Securities Held-to-Maturity $ 3,928,170 $ 3,894,121 $ 373,640 $ 3,520,481 $ — Loans 1 9,436,506 9,519,369 — — 9,519,369 Financial Instruments – Liabilities Time Deposits 1,688,092 1,679,684 — 1,679,684 — Securities Sold Under Agreements to Repurchase 505,293 505,278 — 505,278 — Other Debt 2 250,000 248,520 — 248,520 — 1 Carrying amount is net of unearned income and the Allowance. In accordance with the prospective adoption of ASU No. 2016-01, the fair value of loans as of December 31, 2018 was measured using an exit price notion. The fair value of loans as of December 31, 2017 was measured using an entry price notion. 2 Excludes capitalized lease obligations.

Revenue Recognition (Notes)

Revenue Recognition (Notes)	12 Months Ended
	Dec. 31, 2018
Revenue Recognition [Abstract]
Revenue Recognition	Revenue Recognition On January 1, 2018, the Company adopted ASU No. 2014-09 “Revenue from Contracts with Customers” (Topic 606) and all subsequent ASUs that modified Topic 606. As stated in Note 1 Summary of Significant Accounting Policies , the implementation of the new standard did not have a material impact on the measurement or recognition of revenue; as such, a cumulative effect adjustment to opening retained earnings was not deemed necessary. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts were not adjusted and continue to be reported in accordance with the Company’s historic accounting under Topic 605. Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities, which comprise the majority of the Company’s revenue. In addition, certain noninterest income streams such as fees associated with mortgage servicing rights, financial guarantees, derivatives, and certain credit card fees are also not in the scope of the new guidance. Topic 606 is applicable to noninterest revenue streams such as trust and asset management income, deposit related fees, interchange fees, merchant income, and annuity and insurance commissions. However, the recognition of these revenue streams did not change significantly upon adoption of Topic 606. Substantially all of the Company’s revenue is generated from contracts with customers. Noninterest revenue streams in-scope of Topic 606 are discussed below. Trust and Asset Management Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Company’s performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to customers’ accounts. The Company does not earn performance-based incentives. Optional services such as real estate sales and tax return preparation services are also available to existing trust and asset management customers. The Company’s performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered. Service Charges on Deposit Accounts Service charges on deposit accounts consist of account analysis fees (i.e., net fees earned on analyzed business and public checking accounts), monthly service fees, check orders, and other deposit account related fees. The Company’s performance obligation for account analysis fees and monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Check orders and other deposit account related fees are largely transactional based, and therefore, the Company’s performance obligation is satisfied and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts. Fees, Exchange, and Other Service Charges Fees, exchange, and other service charges are primarily comprised of debit and credit card income, ATM fees, merchant services income, and other service charges. Debit and credit card income is primarily comprised of interchange fees earned whenever the Company’s debit and credit cards are processed through card payment networks such as Visa. ATM fees are primarily generated when a Company cardholder uses a non-Company ATM or a non-Company cardholder uses a Company ATM. Merchant services income mainly represents fees charged to merchants to process their debit and credit card transactions, in addition to account management fees. Other service charges include revenue from processing wire transfers, bill pay service, cashier’s checks, and other services. The Company’s performance obligation for fees, exchange, and other service charges are largely satisfied, and related revenue recognized, when the services are rendered or upon completion. Payment is typically received immediately or in the following month. Annuity and Insurance Annuity and insurance income primarily consists of commissions received on annuity product sales. The Company acts as an intermediary between the Company’s customer and the insurance carrier. The Company’s performance obligation is generally satisfied upon the issuance of the annuity policy. Shortly after the policy is issued, the carrier remits the commission payment to the Company, and the Company recognizes the revenue. The Company does not earn a significant amount of trailer fees on annuity sales. The majority of the trailer fees relates to variable annuity products and are calculated based on a percentage of market value at period end. Revenue is not recognized until the annuity’s market value can be determined. Other Other noninterest income consists of other recurring revenue streams such as commissions from sales of mutual funds and other investments, investment advisor fees from the Company’s Managed Account Platform Services (MAPS) wealth management product, safety deposit box rental fees, and other miscellaneous revenue streams. Commissions from the sale of mutual funds and other investments are recognized on trade date, which is when the Company has satisfied its performance obligation. The Company also receives periodic service fees (i.e., trailers) from mutual fund companies typically based on a percentage of net asset value. Trailer revenue is recorded over time, usually monthly or quarterly, as net asset value is determined. Investment advisor fees from the MAPS wealth management product is earned over time and based on an annual percentage rate of the net asset value. The investment advisor fees are charged to the customer’s account in advance on the first month of the quarter, and the revenue is recognized over the following three-month period. Safe deposit box rental fees are charged to the customer on an annual basis and recognized upon receipt of payment. The Company determined that since rentals and renewals occur fairly consistently over time, revenue is recognized on a basis consistent with the duration of the performance obligation. The following presents noninterest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the years ended December 31, 2018 , 2017 , and 2016 . Year Ended December 31, (dollars in thousands) 2018 2017 2016 Noninterest Income In-scope of Topic 606: Trust and Asset Management $ 43,877 $ 45,430 $ 46,203 Service Charges on Deposit Accounts 13,165 15,191 15,498 Fees, Exchange, and Other Service Charges 46,350 44,560 44,021 Annuity and Insurance 5,615 6,444 6,473 Other 9,652 8,966 8,795 Noninterest Income (in-scope of Topic 606) 118,659 120,591 120,990 Noninterest Income (out-of-scope of Topic 606) 50,264 64,826 76,353 Total Noninterest Income $ 168,923 $ 185,417 $ 197,343 Contract Balances A contract asset balance occurs when an entity performs a service for a customer before the customer pays consideration (resulting in a contract receivable) or before payment is due (resulting in a contract asset). A contract liability balance is an entity’s obligation to transfer a service to a customer for which the entity has already received payment (or payment is due) from the customer. The Company’s noninterest revenue streams are largely based on transactional activity, or standard month-end revenue accruals such as asset management fees based on month-end market values. Consideration is often received immediately or shortly after the Company satisfies its performance obligation and revenue is recognized. The Company does not typically enter into long-term revenue contracts with customers, and therefore, does not experience significant contract balances. As of December 31, 2018 and 2017 , the Company did not have any significant contract balances. Contract Acquisition Costs In connection with the adoption of Topic 606, an entity is required to capitalize, and subsequently amortize into expense, certain incremental costs of obtaining a contract with a customer if these costs are expected to be recovered. The incremental costs of obtaining a contract are those costs that an entity incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained (for example, sales commission). The Company utilizes the practical expedient which allows entities to immediately expense contract acquisition costs when the asset that would have resulted from capitalizing these costs would have been amortized in one year or less. Upon adoption of Topic 606, the Company did not capitalize any contract acquisition cost.

Bank of Hawaii Corporation Fina

Bank of Hawaii Corporation Financial Statements	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Bank of Hawaii Corporation Financial Statements	Bank of Hawaii Corporation Financial Statements Condensed financial statements of the Parent were as follows: Condensed Statements of Comprehensive Income Year Ended December 31, (dollars in thousands) 2018 2017 2016 Income Dividends from Bank of Hawaii $ 185,000 $ 130,000 $ 120,000 Investment Securities Gains (Losses), Net (819 ) 12,027 (340 ) Other Income 198 204 279 Total Income 184,379 142,231 119,939 Noninterest Expense Intercompany Salaries and Services 734 720 705 Other Expenses 1,701 1,401 1,392 Total Noninterest Expense 2,435 2,121 2,097 Income Before Income Tax Benefit and Equity in Undistributed Income of Subsidiaries 181,944 140,110 117,842 Income Tax Benefit (Expense) 2,229 (3,557 ) 2,137 Equity in Undistributed Income of Subsidiaries 35,429 48,119 61,482 Net Income $ 219,602 $ 184,672 $ 181,461 Comprehensive Income $ 210,751 $ 183,863 $ 171,112 Condensed Statements of Condition (dollars in thousands) December 31, 2018 December 31, 2017 Assets Cash with Bank of Hawaii $ 52,731 $ 49,669 Investment Securities Held-to-Maturity 4,999 4,986 Goodwill 14,129 14,129 Income Taxes Receivable and Deferred Tax Assets 1,520 2,567 Other Assets 8,468 8,233 Equity in Net Assets of Subsidiaries 1,195,132 1,161,037 Total Assets $ 1,276,979 $ 1,240,621 Liabilities Income Taxes Payable $ 60 $ 517 Other Liabilities 8,719 8,236 Total Liabilities 8,779 8,753 Shareholders' Equity 1,268,200 1,231,868 Total Liabilities and Shareholders' Equity $ 1,276,979 $ 1,240,621 Condensed Statements of Cash Flows Year Ended December 31, (dollars in thousands) 2018 2017 2016 Operating Activities Net Income $ 219,602 $ 184,672 $ 181,461 Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: Share-Based Compensation 630 573 558 Net (Gains) Losses on Sales of Investment Securities 819 (12,027 ) 340 Equity in Undistributed Income of Subsidiaries (35,429 ) (48,119 ) (61,482 ) Net Change in Other Assets and Other Liabilities 870 (6,477 ) 1,508 Net Cash Provided by Operating Activities 186,492 118,622 122,385 Investing Activities Capital Distribution from BOHC Investment Fund LLC — 613 — Capital Contributions to the Bank — (12,467 ) — Proceeds from (Expenses related to) Sales of Investment Securities (819 ) 12,027 (340 ) Net Cash Provided by (Used in) Investing Activities (819 ) 173 (340 ) Financing Activities Proceeds from Issuance of Common Stock 7,873 13,101 9,079 Repurchase of Common Stock (91,988 ) (47,076 ) (61,807 ) Cash Dividends Paid (98,496 ) (87,066 ) (81,157 ) Net Cash Used in Financing Activities (182,611 ) (121,041 ) (133,885 ) Net Change in Cash and Cash Equivalents 3,062 (2,246 ) (11,840 ) Cash and Cash Equivalents at Beginning of Period 49,669 51,915 63,755 Cash and Cash Equivalents at End of Period $ 52,731 $ 49,669 $ 51,915

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	The accounting and reporting principles of the Company conform to U.S. generally accepted accounting principles (“GAAP”) and prevailing practices within the financial services industry.
Use of Estimates in the Preparation of Financial Statements	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Actual results may differ from those estimates and such differences could be material to the financial statements.
Consolidation	Consolidation The accompanying consolidated financial statements include the accounts of the Parent and its subsidiaries. The Parent’s principal operating subsidiary is Bank of Hawaii (the “Bank”). All significant intercompany accounts and transactions have been eliminated in consolidation.
Variable Interest Entities	Variable Interest Entities Variable interests are defined as contractual ownership or other interests in an entity that change with fluctuations in an entity’s net asset value. The primary beneficiary consolidates the variable interest entity (“VIE”). The primary beneficiary is defined as the enterprise that has both the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and the obligation to absorb losses or the right to receive benefits that could be significant to the VIE. The Company has limited partnership interests in several low-income housing partnerships. These partnerships provide funds for the construction and operation of apartment complexes that provide affordable housing to lower-income households. If these developments successfully attract a specified percentage of residents falling in that lower income range, state and/or federal income tax credits are made available to the partners. The tax credits are generally recognized over 10 years. In order to continue receiving the tax credits each year over the life of the partnership, the low-income residency targets must be maintained. Prior to January 1, 2015, the Company utilized the effective yield method whereby the Company recognized tax credits generally over 10 years and amortized the initial cost of the investment to provide a constant effective yield over the period that tax credits are allocated to the Company. On January 1, 2015, the Company adopted Accounting Standards Update (“ASU”) No. 2014-01, “Accounting for Investments in Qualified Affordable Housing Projects” prospectively for new investments. ASU No. 2014-01 permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. As permitted by ASU No. 2014-01, the Company elected to continue to utilize the effective yield method for investments made prior to January 1, 2015. Unfunded commitments to fund these low-income housing partnerships were $15.2 million and $17.5 million as of December 31, 2018 and 2017 , respectively. These unfunded commitments are unconditional and legally binding and are recorded in other liabilities in the consolidated statements of condition. See Note 18 Affordable Housing Projects Tax Credit Partnerships for more information. The Company also has limited partnership interests in solar energy tax credit partnership investments. These partnerships develop, build, own and operate solar renewable energy projects. Over the course of these investments, the Company expects to receive federal and state tax credits, tax-related benefits, and excess cash available for distribution, if any. The Company may be called to sell its interest in the limited partnerships through a call option once all investment tax credits have been recognized. Tax benefits associated with these investments are generally recognized over 6 years. These entities meet the definition of a VIE; however, the Company is not the primary beneficiary of the entities, as the general partner has both the power to direct the activities that most significantly impact the economic performance of the entities and the obligation to absorb losses or the right to receive benefits that could be significant to the entities. While the partnership agreements allow the limited partners, through a majority vote, to remove the general partner, this right is not deemed to be substantive as the general partner can only be removed for cause. The investments in these entities are initially recorded at cost, which approximates the maximum exposure to loss as a result of the Company’s involvement with these unconsolidated entities. The balance of the Company’s investments in these entities was $85.9 million and $87.6 million as of December 31, 2018 and 2017 , respectively, and is included in other assets in the consolidated statements of condition.
Investment Securities	Investment Securities Investment securities are accounted for according to their purpose and holding period. Trading securities are those that are bought and held principally for the purpose of selling them in the near term. The Company held no trading securities as of December 31, 2018 and 2017 . Available-for-sale investment securities, comprised of debt and mortgage-backed securities, are those that may be sold before maturity due to changes in the Company’s interest rate risk profile or funding needs, and are reported at fair value with unrealized gains and losses, net of taxes, reported as a component of other comprehensive income. Held-to-maturity investment securities, comprised of debt and mortgage-backed securities, are those that management has the positive intent and ability to hold to maturity and are reported at amortized cost. Realized gains and losses are recorded in noninterest income and are determined on a trade date basis using the specific identification method. Interest and dividends on investment securities are recognized in interest income on an accrual basis. Premiums and discounts are amortized or accreted into interest income using the interest method over the expected lives of the individual securities. Transfers of debt securities from the available-for-sale category to the held-to-maturity category are made at fair value at the date of transfer. The unrealized holding gain or loss at the date of transfer remains in accumulated other comprehensive income and in the carrying value of the held-to-maturity investment security. Premiums or discounts on investment securities are amortized or accreted as an adjustment of yield using the interest method over the estimated life of the security. Unrealized holding gains or losses that remain in accumulated other comprehensive income are also amortized or accreted over the estimated life of the security as an adjustment of yield, offsetting the related amortization of the premium or accretion of the discount.
Other-Than-Temporary Impairments of Investment Securities	Other-Than-Temporary-Impairments of Investment Securities The Company conducts an other-than-temporary-impairment (“OTTI”) analysis of investment securities on a quarterly basis or more often if a potential loss-triggering event occurs. A write-down of a debt security is recorded when fair value is below amortized cost in circumstances where: (1) the Company has the intent to sell a security; (2) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis; or (3) the Company does not expect to recover the entire amortized cost basis of the security. If the Company intends to sell a security or if it is more likely than not that the Company will be required to sell the security before recovery, an OTTI write-down is recognized in earnings equal to the entire difference between the security’s amortized cost basis and its fair value. If the Company does not intend to sell the security or it is not more likely than not that it will be required to sell the security before recovery, the OTTI write-down is separated into an amount representing credit loss, which is recognized in earnings, and an amount related to all other factors, which is recognized in other comprehensive income. To determine the amount related to credit loss on a debt security, the Company applies a methodology similar to that used for evaluating the impairment of loans. As of December 31, 2018 , management determined that the Company did not own any investment securities that were other-than-temporarily-impaired.
Loans Held for Sale	Loans Held for Sale Residential mortgage loans with the intent to be sold in the secondary market are accounted for on an aggregate basis under the fair value option. Fair value is primarily determined based on quoted prices for similar loans in active markets. Non-refundable fees and direct loan origination costs related to residential mortgage loans held for sale are recognized as part of the cost basis of the loan at the time of sale. Gains and losses on sales of residential mortgage loans (sales proceeds minus carrying value) are recorded in the mortgage banking component of noninterest income. Commercial loans that management has an active plan to sell are valued on an individual basis at the lower-of-cost-or fair value. Fair value is primarily determined based on quoted prices for similar loans in active markets or agreed upon sales prices. Any reduction in the loan’s value, prior to being transferred to the held-for-sale category, is reflected as a charge-off of the recorded investment in the loan resulting in a new cost basis, with a corresponding reduction in the allowance for loan and lease losses. Further decreases in the fair value of the loan are recognized in noninterest expense.
Loans and Leases	Loans and Leases Loans are reported at the principal amount outstanding, net of unearned income including unamortized deferred loan fees and costs, and cumulative net charge-offs. Interest income is recognized on an accrual basis. Loan origination fees, certain direct costs, and unearned discounts and premiums, if any, are deferred and are generally amortized into interest income as yield adjustments using the interest method over the contractual life of the loan. Loan commitment fees are generally recognized into noninterest income. Other credit-related fees are recognized as fee income, a component of noninterest income, when earned. Direct financing leases are carried at the aggregate of lease payments receivable plus the estimated residual value of leased property, less unearned income. Leveraged leases, which are a form of direct financing leases, are carried net of non-recourse debt. Unearned income on direct financing and leveraged leases is amortized over the lease term by methods that approximate the interest method. Residual values on leased assets are periodically reviewed for impairment. Portfolio segments are defined as the level at which an entity develops and documents a systematic methodology to determine its allowance for loan and lease losses (the “Allowance”). Management has determined that the Company has two portfolio segments of loans and leases (commercial and consumer) in determining the Allowance. Both quantitative and qualitative factors are used by management at the portfolio segment level in determining the adequacy of the Allowance for the Company. Classes of loans and leases are a disaggregation of a Company’s portfolio segments. Classes are defined as a group of loans and leases which share similar initial measurement attributes, risk characteristics, and methods for monitoring and assessing credit risk. Management has determined that the Company has seven classes of loans and leases (commercial and industrial, commercial mortgage, construction, lease financing, residential mortgage, home equity, automobile, and other). The “other” class of loans and leases is comprised of revolving credit, installment, and lease financing arrangements.
Non-Performing Loans and Leases	Non-Performing Loans and Leases Generally, all classes of commercial loans and leases are placed on non-accrual status upon becoming contractually past due 90 days as to principal or interest (unless loans and leases are adequately secured by collateral, are in the process of collection, and are reasonably expected to result in repayment), when terms are renegotiated below market levels, or where substantial doubt about full repayment of principal or interest is evident. For residential mortgage and home equity loan classes, loans past due 120 days as to principal or interest may be placed on non-accrual status, and a partial charge-off may be recorded, depending on the collateral value and/or the collectability of the loan. For automobile and other consumer loan classes, the entire outstanding balance of the loan is charged off when the loan becomes 120 days past due as to principal or interest. When a loan or lease is placed on non-accrual status, the accrued and unpaid interest receivable is reversed and the loan or lease is accounted for on the cash or cost recovery method until qualifying for return to accrual status. All payments received on non-accrual loans and leases are applied against the principal balance of the loan or lease. A loan or lease may be returned to accrual status when all delinquent interest and principal become current in accordance with the terms of the loan or lease agreement and when doubt about repayment is resolved. Generally, for all classes of loans and leases, a charge-off is recorded when it is probable that a loss has been incurred and when it is possible to determine a reasonable estimate of the loss. For all classes of commercial loans and leases, a charge-off is determined on a judgmental basis after due consideration of the debtor’s prospects for repayment and the fair value of collateral. For the pooled segment of the Company’s commercial and industrial loan class, which consists of small business loans, the entire outstanding balance of the loan remains on accrual status until it is charged off during the month that the loan becomes 120 days past due as to principal or interest. As previously mentioned, for residential mortgage and home equity loan classes, a partial charge-off may be recorded at 120 days past due as to principal or interest depending on the collateral value and/or the collectability of the loan. In the event that a loan or line in the home equity loan class is behind another financial institution’s first mortgage, the entire outstanding balance of the loan is charged off when the loan becomes 120 days past due as to principal or interest, unless the combined loan-to-value ratio is 60% or less. As noted above, loans in the automobile and other consumer loan classes are charged off in its entirety upon the loan becoming 120 days past due as to principal or interest.
Impaired Loans	Impaired Loans A loan is considered impaired when, based on current information and events, it is probable that the Company will not be able to collect all amounts due from the borrower in accordance with the contractual terms of the loan, including scheduled interest payments. Impaired loans include all classes of commercial non-accruing loans (except lease financing and small business loans), and all loans modified in a troubled debt restructuring. Impaired loans exclude lease financing and smaller balance homogeneous loans (consumer and small business non-accruing loans) that are collectively evaluated for impairment. For all classes of commercial loans, a quarterly evaluation of individual commercial borrowers is performed to identify impaired loans. The identification of specific borrowers for review is based on a review of non-accrual loans as well as those loans specifically identified by management as exhibiting above average levels of risk. When a loan has been identified as being impaired, the amount of impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the estimated fair value of the collateral, less any selling costs, if the loan is collateral-dependent. If the measurement of the impaired loan is less than the recorded investment in the loan (including accrued interest, net of deferred loan fees or costs, and unamortized premiums or discounts), impairment is recognized by establishing or adjusting an existing allocation of the Allowance, or by recording a partial charge-off of the loan to its fair value. Interest payments made on impaired loans are typically applied to principal unless collectability of the principal amount is reasonably assured, in which case interest income may be accrued or recognized on a cash basis.
Loans Modified in a Troubled Debt Restructuring	Loans Modified in a Troubled Debt Restructuring Loans are considered to have been modified in a troubled debt restructuring when, due to a borrower’s financial difficulties, the Company makes certain concessions to the borrower that it would not otherwise consider. Modifications may include interest rate reductions, principal or interest forgiveness, forbearance, and other actions intended to minimize economic loss and to avoid foreclosure or repossession of collateral. Generally, a non-accrual loan that has been modified in a troubled debt restructuring remains on non-accrual status for a period of at least 6 months to demonstrate that the borrower is able to meet the terms of the modified loan. 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, the loan remains on non-accrual status.
Reserve for Credit Losses	Reserve for Credit Losses The Company’s reserve for credit losses is comprised of two components, the Allowance and the reserve for unfunded commitments (the “Unfunded Reserve”).
Allowance for Loan and Lease Losses	Allowance for Loan and Lease Losses The Company maintains an Allowance adequate to cover management’s estimate of probable credit losses as of the balance sheet date. Loans and leases that are charged off reduce the Allowance while recoveries of loans and leases previously charged off increase the Allowance. Other changes to the level of the Allowance are recognized through charges or credits to the provision for credit losses (the “Provision”). The Allowance considers both unimpaired and impaired loans and is developed and documented at the portfolio segment level (commercial and consumer). The level of the Allowance related to the Company’s commercial portfolio segment is generally based on the credit risk ratings and historical loss experience of individual borrowers. This is supplemented as necessary by credit judgment to address observed changes in trends and conditions, and other relevant environmental and economic factors that may affect the collectability of loans and leases. Excluding those loans and leases evaluated individually for impairment, the Company’s remaining commercial loans and leases are pooled and collectively evaluated for impairment based on business unit and internal risk rating segmentation. The level of the Allowance related to the Company’s consumer portfolio segment is generally based on analyses of homogeneous pools of loans and leases. Loans and leases are pooled based on similar loan and lease risk characteristics for collective evaluation of impairment. Loss estimates are calculated based on historical rolling average loss rates and average delinquency flows to loss. Consumer loans that have been individually evaluated for impairment or modified in a troubled debt restructuring are excluded from the homogeneous pools. Impairment related to such loans is generally determined based on the present value of expected future cash flows discounted at the loan’s original effective interest rate. The Allowance also includes an estimate for inherent losses not reflected in the historical analyses. Relevant factors include, but are not limited to, concentrations of credit risk (geographic, large borrower, and industry), economic trends and conditions, changes in underwriting standards, experience and depth of lending staff, trends in delinquencies, and the level of net charge-offs. In addition, the Company uses a variety of other tools to estimate probable credit losses including, but not limited to, a rolling quarterly forecast of asset quality metrics; stress testing; and performance indicators based on the Company’s own experience, peers, or other industry sources.
Reserve for Unfunded Commitments	Reserve for Unfunded Commitments The Unfunded Reserve is a component of other liabilities and represents the estimate for probable credit losses inherent in unfunded commitments to extend credit. Unfunded commitments to extend credit include banker’s acceptances, and standby and commercial letters of credit. The process used to determine the Unfunded Reserve is consistent with the process for determining the Allowance, as adjusted for estimated funding probabilities or loan and lease equivalency factors. The level of the Unfunded Reserve is adjusted by recording an expense or recovery in other noninterest expense.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash and due from banks, interest-bearing deposits in other banks, and funds sold. All amounts are readily convertible to cash and have maturities of less than 90 days.
Premises and Equipment	Premises and Equipment Premises and equipment, including leasehold improvements, are stated at cost, less accumulated depreciation and amortization. Capital leases are included in premises and equipment at the capitalized amount less accumulated amortization. Premises and equipment are depreciated using the straight-line method over the estimated useful lives of the respective assets. Estimated useful lives generally range up to 30 years for buildings and up to 10 years for equipment. Capitalized leased assets and leasehold improvements are amortized over the shorter of the estimated useful life of the asset or the lease term. Repairs and maintenance are charged to expense as incurred, while improvements which extend the estimated useful life of the asset are capitalized and depreciated over the estimated remaining life of the asset. Premises and equipment are periodically evaluated for impairment when events or changes in circumstances indicate the carrying amount may not be recoverable. Impairment exists when the expected undiscounted future cash flows of premises and equipment are less than its carrying amount. In that event, the Company records a loss for the difference between the carrying amount and the fair value of the asset based on quoted market prices, if applicable, or a discounted cash flow analysis
Foreclosed Real Estate	Foreclosed Real Estate Foreclosed real estate consists of properties acquired through foreclosure proceedings or acceptance of a deed-in-lieu of foreclosure. These properties are recorded at fair value less estimated costs to sell the property. If the recorded investment in the loan exceeds the property’s fair value at the time of acquisition, a charge-off is recorded against the Allowance. If the fair value of the property at the time of acquisition exceeds the carrying amount of the loan, the excess is recorded either as a recovery to the Allowance if a charge-off had previously been recorded, or as a gain on initial transfer in other noninterest income. Subsequent decreases in the property’s fair value and operating expenses of the property are recognized through charges to other noninterest expense. The fair value of the property acquired is based on third party appraisals, broker price opinions, recent sales activity, or a combination thereof, subject to management judgment.
Mortgage Servicing Rights	Mortgage Servicing Rights Mortgage servicing rights are recognized as assets when mortgage loans are sold and the rights to service those loans are retained. Mortgage servicing rights are initially recorded at fair value by using a discounted cash flow model to calculate the present value of estimated future net servicing income. The Company’s mortgage servicing rights accounted for under the fair value method are carried on the statements of condition at fair value with changes in fair value recorded in mortgage banking income in the period in which the change occurs. Changes in the fair value of mortgage servicing rights are primarily due to changes in valuation inputs, assumptions, and the collection and realization of expected cash flows. The Company’s mortgage servicing rights accounted for under the amortization method are initially recorded at fair value. However, these mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income. An impairment analysis is prepared on a quarterly basis by estimating the fair value of the mortgage servicing rights and comparing that value to the carrying amount. A valuation allowance is established when the carrying amount of these mortgage servicing rights exceeds fair value.
Goodwill	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. Goodwill impairment testing is performed at the reporting unit level, equivalent to a business segment or one level below. The Company has goodwill assigned to the following reporting units: Investment Services and Retail Banking. The Company performs its annual evaluation of goodwill impairment in the fourth quarter of each year and on an interim basis if events or changes in circumstances indicate that there may be impairment. The Company performs a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. The qualitative factors considered include, but are not limited to, macroeconomic and State of Hawaii economic conditions, industry and market conditions and trends, the Company’s financial performance, market capitalization, stock price, and any Company-specific events relevant to the assessment. If the assessment of qualitative factors indicates that it is not more likely than not that an impairment exists, no further testing is performed; otherwise an impairment test is performed. Prior to 2017, the goodwill impairment test was a two-step test. The first step compared the estimated fair value of identified reporting units with their carrying amount, including goodwill. If the estimated fair value of a reporting unit was less than the carrying value, the second step was required to determine the implied fair value of the reporting unit’s goodwill and the amount of goodwill impairment, if any. In 2017, the Company elected to early adopt ASU No. 2017-04, “Simplifying the Test for Goodwill Impairment.” The guidance removed Step 2 of the goodwill impairment test. Goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance remained largely unchanged. Subsequent reversals of goodwill impairment are prohibited. For the year ended December 31, 2018 , the Company’s goodwill impairment evaluation, based on its qualitative assessment, indicated there was no impairment.
Non-Marketable Equity Securities	Non-Marketable Equity Securities The Company is required to own Federal Home Loan Bank (“FHLB”) of Des Moines and Federal Reserve Bank (“FRB”) stock as a condition of membership. These non-marketable equity securities are accounted for at cost which equals par or redemption value. These securities do not have a readily determinable fair value as their ownership is restricted and there is no market for these securities. These securities can only be redeemed or sold at their par value and only to the respective issuing government supported institution or to another member institution. The Company records these non-marketable equity securities as a component of other assets, which are periodically evaluated for impairment. Management considers these non-marketable equity securities to be long-term investments. Accordingly, when evaluating these securities for impairment, management considers the ultimate recoverability of the par value rather than by recognizing temporary declines in value.
Securities Sold Under Agreements to Repurchase	Securities Sold Under Agreements to Repurchase The Company enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Company may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Company to repurchase the assets. As a result, securities sold under agreements to repurchase are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities. The obligation to repurchase the securities is reflected as a liability in the Company’s consolidated statements of condition, while the securities underlying the securities sold under agreements to repurchase remain in the respective asset accounts. See Note 19 Balance Sheet Offsetting for more information.
Pension and Postretirement Benefit Plans	Pension and Postretirement Benefit Plans The Company incurs certain employment-related expenses associated with its two frozen pension plans and a postretirement benefit plan (the “Plans”). In order to measure the expense associated with the Plans, various assumptions are made including the discount rate, expected return on plan assets, anticipated mortality rates, and expected future healthcare costs. The assumptions are based on historical experience as well as current facts and circumstances. The Company uses a December 31 measurement date for its Plans. As of the measurement date, plan assets are determined based on fair value, generally representing observable market prices. The projected benefit obligation is primarily determined based on the present value of projected benefit distributions at an assumed discount rate. Net periodic pension benefit costs include interest costs based on an assumed discount rate, the expected return on plan assets based on actuarially derived market-related values, and the amortization of net actuarial gains or losses. Net periodic postretirement benefit costs include service costs, interest costs based on an assumed discount rate, and the amortization of prior service credits and net actuarial gains or losses. Differences between expected and actual results in each year are included in the net actuarial gain or loss amount, which is recognized in other comprehensive income. The net actuarial gain or loss in excess of a 10% corridor is amortized in net periodic benefit cost over the average remaining expected lives of the pension plan participants and over the average remaining future service years of the postretirement benefit plan participants. The prior service credit is amortized over the average remaining service period to full eligibility for participating employees expected to receive benefits. The Company recognizes in its consolidated statements of condition an asset for a plan’s overfunded status or a liability for a plan’s underfunded status. The Company also measures the Plans’ assets and obligations that determine its funded status as of the end of the year and recognizes those changes in other comprehensive income, net of tax.
Income Taxes	Income Taxes The Parent files a consolidated federal income tax return with the Bank and its subsidiaries. Calculation of the Company’s provision for income taxes requires the interpretation of income tax laws and regulations and the use of estimates and judgments in its determination. The Company is subject to examination by governmental authorities that may give rise to income tax issues due to differing interpretations. Changes to the liability for income taxes also occur due to changes in income tax rates, implementation of new business strategies, resolution of issues with taxing authorities, and newly enacted statutory, judicial, and regulatory guidance. Deferred income taxes are provided to reflect the tax effect of temporary differences between financial statement carrying amounts and the corresponding tax basis of assets and liabilities. Deferred income taxes are calculated by applying enacted statutory tax rates and tax laws to future years in which temporary differences are expected to reverse. The impact on deferred tax assets and liabilities from a change in tax rates is recognized in income in the period that the tax rate change is enacted. A deferred tax valuation allowance is established if it is more likely than not that a deferred tax asset will not be realized. The Company’s tax sharing policy provides for the settlement of income taxes between each relevant subsidiary as if the subsidiary had filed a separate return. Payments are made to the Parent by subsidiaries with tax liabilities and subsidiaries that generate tax benefits receive payments for those benefits as used. The Company maintains reserves for certain tax positions that arise in the normal course of business. As of December 31, 2018 , these positions were evaluated based on an assessment of probabilities as to the likelihood of whether a liability had been incurred. Such assessments are reviewed as events occur and adjustments to the reserves are made as appropriate. In evaluating a tax position for recognition, the Company evaluates whether it is more likely than not that a tax position will be sustained upon examination, including resolution of related appeals or litigation processes, based on the technical merits of the position. If the tax position meets the more likely than not recognition threshold, the tax position is measured and recognized in the Company’s Consolidated Financial Statements as the largest amount of tax benefit that, in management’s judgment, is greater than 50% likely of being realized upon ultimate settlement. Public law No. 115-97, known as the Tax Cuts and Jobs Act (the "Tax Act"), which was enacted on December 22, 2017, reduced the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018. Also on December 22, 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provides guidance on accounting for tax effects of the Tax Act. SAB 118 provides a measurement period of up to one year from the enactment date to complete the accounting. As such, adjustments during this measurement period were included in net earnings from continuing operations as an adjustment to income tax expense in the reporting period when such adjustments were determined. The provisional amount recorded in the fourth quarter of 2017 related to the remeasurement of the Company's deferred tax balance resulted in additional income tax expense of $3.6 million .
Treasury Stock	Treasury Stock Shares of the Parent’s common stock that are repurchased are recorded in treasury stock at cost. On the date of subsequent re-issuance, the treasury stock account is reduced by the cost of such stock on a first-in, first-out basis.
Earnings Per Share	Earnings Per Share Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed by dividing net income by the weighted average number of common shares outstanding for the period, assuming conversion of all potentially dilutive common stock equivalents.
Derivative Financial Instruments	Derivative Financial Instruments In the ordinary course of business, the Company enters into derivative financial instruments as an end-user in connection with its risk management activities and to accommodate the needs of its customers. The Company has elected not to qualify for hedge accounting methods addressed under current provisions of GAAP. Derivative financial instruments are stated at fair value on the consolidated statements of condition with changes in fair value reported in current period earnings.
Share-Based Compensation	Share-Based Compensation The Company may grant share-based compensation to employees and non-employee directors in the form of restricted stock, restricted stock units and stock options. The fair value of restricted stock is determined based on the closing price of the Parent’s common stock on the date of grant. The Company recognizes compensation expense related to restricted stock on a straight-line basis over the vesting period for service-based awards, plus additional recognition of costs associated with accelerated vesting based on the projected attainment of Company performance measures. Restricted stock units (“RSUs”) are payable solely in cash which are accounted for as other liabilities in the consolidated statements of condition. The fair value of RSUs is initially valued based on the closing price of the Parent’s common stock on the date of grant and is amortized in the statement of income over the vesting period. The RSUs are subsequently remeasured in the same manner described above at the end of each reporting period until settlement. The fair value of stock options is estimated at the date of grant using the Black-Scholes option pricing model and related assumptions. The Company uses historical data to predict option exercise and employee termination behavior. Expected volatilities are based on the historical volatility of the Parent’s common stock. The expected term of options granted is derived from actual historical exercise activity and represents the period of time that options granted are expected to be outstanding. The risk-free rate is derived from the U.S. Treasury yield curve in effect at the time of grant based on the expected life of the option. The dividend yield is equal to the dividend yield of the Parent’s common stock at the time of grant. The amortization of the expense related to stock options reflects estimated forfeitures, adjusted for actual forfeiture experience. Amortization expense related to stock options is recorded in the statements of income as a component of salaries and benefits for employees and as a component of other noninterest expense for non-employee directors, with a corresponding increase to capital surplus in shareholders’ equity. As the expense related to stock options is recognized, a deferred tax asset is established that represents an estimate of future income tax deductions from the release of restrictions or the exercise of stock options.
Advertising Costs	Advertising Costs Advertising costs are expensed as incurred
International Operations	International Operations The Bank has operations that are conducted in certain Pacific Islands that are denominated in U.S. dollars. These operations are classified as domestic.
Fair Value Measurements	Fair Value Measurements Fair value measurements apply whenever GAAP requires or permits assets or liabilities to be measured at fair value either on a recurring or nonrecurring basis. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market for an asset or liability in an orderly transaction between market participants at the measurement date. Fair value is based on the assumptions that management believes market participants would use when pricing an asset or liability. Fair value measurement and disclosure guidance established a three-level fair value hierarchy that prioritizes the use of inputs used in valuation methodologies. Management maximizes the use of observable inputs and minimizes the use of unobservable inputs when determining fair value measurements. Management reviews and updates the fair value hierarchy classifications of the Company’s assets and liabilities on a quarterly basis. The three-level fair value hierarchy is 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 shall be used to measure fair value whenever available. A contractually binding sales price also provides reliable evidence of fair value. 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 utilize model-based techniques for which all significant assumptions are observable in the market. Level 3: Inputs to the valuation methodology are unobservable and significant to the fair value measurement; inputs to the valuation methodology that utilize model-based techniques for which significant assumptions are not observable in the market; or inputs to the valuation methodology that requires significant management judgment or estimation, some of which may be internally developed.
Accounting Standards Adopted in the Current Year or Pending Adoption	Accounting Standards Adopted in 2018 In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09, “Revenue from Contracts with Customers.” The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies generally will be required to use more judgment and make more estimates than under prior guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. Subsequent to the issuance of ASU 2014-09, the FASB issued targeted updates to clarify specific implementation issues including ASU No. 2016-08, “Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” ASU No. 2016-10, “Identifying Performance Obligations and Licensing,” ASU No. 2016-12, “Narrow-Scope Improvements and Practical Expedients,” and ASU No. 2016-20 “Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers.” For financial reporting purposes, the standard allows for either full retrospective adoption, meaning the standard is applied to all of the periods presented, or modified retrospective adoption, meaning the standard is applied only to the most current period presented in the financial statements with the cumulative effect of initially applying the standard recognized at the date of initial application. Since the standard does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other GAAP, the new standard did not have a material impact on revenue most closely associated with financial instruments, including interest income and expense. The Company completed its overall assessment of revenue streams and review of related contracts potentially affected by the ASUs, including trust and asset management fees, deposit related fees, interchange fees, merchant income, and annuity and insurance commissions. Based on this assessment, the Company concluded that ASU 2014-09 did not materially change the method in which the Company currently recognizes revenue for these revenue streams. The Company also completed its evaluation of certain costs related to these revenue streams to determine whether such costs should be presented as expenses or contra-revenue (i.e., gross vs. net). Based on its evaluation, the Company determined that the classification of certain debit and credit card related costs should change (i.e., costs previously recorded as expense is now recorded as contra-revenue, and vice versa). These classification changes resulted in immaterial changes to both revenue and expense. The Company also determined that certain costs related to ATMs should be recorded as an expense rather than a reduction of revenue. This change did not have a material effect to noninterest income or expense. The Company adopted ASU 2014-09 and its related amendments on its required effective date of January 1, 2018 utilizing the modified retrospective approach. Since there was no net income impact upon adoption of the new guidance, a cumulative effect adjustment to opening retained earnings was not deemed necessary. Consistent with the modified retrospective approach, the Company did not adjust prior period amounts for the debit and credit card costs and the ATM costs reclassifications noted above. See Note 22 Revenue Recognition for more information. In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities.” This ASU addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments by making targeted improvements to GAAP as follows: (1) require 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. However, an entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer; (2) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. When a qualitative assessment indicates that impairment exists, an entity is required to measure the investment at fair value; (3) eliminate the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities; (4) eliminate 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 on the balance sheet; (5) require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (6) require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; (7) require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and (8) clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. The Company’s adoption of ASU No. 2016-01 on January 1, 2018 did not have a material impact on the Company’s Consolidated Financial Statements. In accordance with (5) above, the Company measured the fair value of its loan portfolio as of December 31, 2018 using an exit price notion (see Note 21 Fair Value of Assets and Liabilities ). In August 2016, the FASB issued ASU No. 2016-15, “Classification of Certain Cash Receipts and Cash Payments.” At the time, GAAP was unclear or did not include specific guidance on how to classify certain transactions in the statement of cash flows. This ASU is intended to reduce diversity in practice in how eight particular transactions are classified in the statement of cash flows. ASU No. 2016-15 was effective for interim and annual reporting periods beginning after December 15, 2017. Entities were required to apply the guidance retrospectively. If it is impracticable to apply the guidance retrospectively for an issue, the amendments related to that issue would be applied prospectively. The Company adopted ASU No. 2016-15 on January 1, 2018. ASU No. 2016-15 did not have a material impact on the Company’s Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” Under the new guidance, employers are required to present the service cost component of the net periodic benefit cost in the same income statement line item (e.g., Salaries and Benefits) as other employee compensation costs arising from services rendered during the period. In addition, only the service cost component will be eligible for capitalization in assets. Employers will present the other components of net periodic benefit cost separately (e.g., Other Noninterest Expense) from the line item that includes the service cost. ASU No. 2017-07 became effective for interim and annual reporting periods beginning after December 15, 2017. Employers will apply the guidance on the presentation of the components of net periodic benefit cost in the income statement retrospectively. The guidance limiting the capitalization of net periodic benefit cost in assets to the service cost component will be applied prospectively. The Company adopted ASU No. 2017-07 on January 1, 2018 and utilized the ASU’s practical expedient allowing entities to estimate amounts for comparative periods using the information previously disclosed in their pension and other postretirement benefit plan footnote. ASU No. 2017-07 did not have a material impact on the Company’s Consolidated Financial Statements. In February 2018, the FASB issued ASU No. 2018-02, “ Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” This ASU allows a reclassification from accumulated other comprehensive income (“AOCI”) to retained earnings for certain income tax effects stranded in AOCI as a result of the Tax Act. Consequently, the reclassification eliminates the stranded tax effects resulting from the Tax Act and is intended to improve the usefulness of information reported to financial statement users. However, because the ASU only relates to the reclassification of the income tax effects of the Tax Act, the underlying guidance that requires the effect of a change in tax laws or rates to be included in income from continuing operations is not affected. ASU No. 2018-02 is effective for the Company's reporting period beginning on January 1, 2019; early adoption is permitted. The Company elected to adopt ASU No. 2018-02 during the first quarter of 2018, and elected to reclassify the income tax effects of the Tax Act from AOCI to retained earnings. The reclassification decreased AOCI and increased retained earnings by $7.5 million , with zero net effect on total shareholders’ equity. The Company utilizes the individual securities approach when releasing income tax effects from AOCI for its investment securities. In August 2018, the FASB issued ASU No. 2018-14, “Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans.” This ASU makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. ASU 2018-14 is effective for fiscal years ending after December 15, 2020; early adoption is permitted. The Company elected to early adopt ASU 2018-14 during the quarter ended December 31, 2018. As ASU 2018-14 only revises disclosure requirements (reflected in Note 14 Employee Benefits ), the adoption did not have any impact on the Company’s Consolidated Financial Statements. In September 2018, the FASB issued ASU No. 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” This ASU requires an entity in a cloud computing arrangement (i.e., hosting arrangement) that is a service contract to follow the internal-use software guidance in ASC 350-40 to determine which implementation costs to capitalize as assets or expense as incurred. Capitalized implementation costs should be presented in the same line item on the balance sheet as amounts prepaid for the hosted service, if any (generally as an “other asset”). The capitalized costs will be amortized over the term of the hosting arrangement, with the amortization expense being presented in the same income statement line item as the fees paid for the hosted service. ASU 2018-15 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted. The Company elected to adopt ASU 2018-15 during the quarter ended September 30, 2018 on a prospective basis. ASU 2018-15 did not have a material impact on the Company’s Consolidated Financial Statements. Accounting Standards Pending Adoption In February 2016, the FASB issued ASU No. 2016-02, “Leases.” Under the new guidance, lessees will be required to recognize the following for all leases (with the exception of short-term leases): 1) a lease liability, which is the present value of a lessee’s obligation to make lease payments, and 2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessor accounting under the new guidance remains largely unchanged as it is substantially equivalent to existing guidance for sales-type leases, direct financing leases, and operating leases. Leveraged leases have been eliminated, although lessors can continue to account for existing leveraged leases using the current accounting guidance. Other limited changes were made to align lessor accounting with the lessee accounting model and the new revenue recognition standard . All entities will classify leases to determine how to recognize lease-related revenue and expense. Quantitative and qualitative disclosures will be required by lessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The intention is to require enough information to supplement the amounts recorded in the financial statements so that users can understand more about the nature of an entity’s leasing activities. ASU No. 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018. All entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. As the Company elected the transition option provided in ASU No. 2018-11 (see below), the modified retrospective approach was applied on January 1, 2019 (as opposed to January 1, 2017). The Company also elected certain relief options offered in ASU 2016-02 including the package of practical expedients, the option not to separate lease and non-lease components and instead to account for them as a single lease component, and the option not to recognize right-of-use assets and lease liabilities that arise from short-term leases (i.e., leases with terms of twelve months or less). The Company did not elect the hindsight practical expedient, which allows entities to use hindsight when determining lease term and impairment of right-of-use assets. The Company has several lease agreements, such as branch locations, which are currently considered operating leases, and therefore, not recognized on the Company’s consolidated statements of condition. The new guidance requires these lease agreements to be recognized on the consolidated statements of condition as a right-of-use asset and a corresponding lease liability. Upon adoption of ASU 2016-02 on its required effective date of January 1, 2019, the Company recorded an operating lease right-of-use asset of $106.5 million and a corresponding operating lease liability of $113.4 million . The Company expects its regulatory capital ratios to remain above the thresholds necessary to be classified as a “well capitalized” institution. The new guidance did not have a material impact on the consolidated statements of income. The Company is completing its evaluation of the ASU’s expanded disclosure requirements effective for the March 31, 2019 Form 10-Q. In June 2016, the FASB issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments.” This ASU significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. In issuing the standard, the FASB is responding to criticism that today’s guidance delays recognition of credit losses. The standard will replace today’s “incurred loss” approach with an “expected loss” model. The new model, referred to as the current expected credit loss (“CECL”) model, will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. This includes, but is not limited to, loans, leases, held-to-maturity securities, loan commitments, and financial guarantees. The CECL model does not apply to available-for-sale (“AFS”) debt securities. For AFS debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the credit losses will be recognized as allowances rather than reductions in the amortized cost of the securities. As a result, entities will recognize improvements to estimated credit losses immediately in earnings rather than as interest income over time, as they do today. The ASU also simplifies the accounting model for purchased credit-impaired debt securities and loans. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models, and methods for estimating the allowance for loan and lease losses. In addition, entities will need to disclose the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination. ASU No. 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted for interim and annual reporting periods beginning after December 15, 2018. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company is planning to adopt the standard in the first quarter of 2020 and is continuing its implementation efforts through its Company-wide implementation team. This team has assigned roles and responsibilities, key tasks to complete, and a general timeline to be followed. The team meets periodically to discuss the latest developments and ensure progress is being made. The team has been working with an advisory consultant and is finalizing the methodologies that will be utilized, which will be followed by developing and documenting processes, controls, policies and disclosure requirements in preparation for performing a full parallel run. The Company’s preliminary evaluation indicates the provisions of ASU No. 2016-13 are expected to impact the Company’s Consolidated Financial Statements, in particular the level of the reserve for credit losses. The Company is continuing to evaluate the extent of the potential impact and expects that portfolio composition and economic conditions at the time of adoption will be a factor. In August 2017, the FASB issued ASU No. 2017-12, “Targeted Improvements to Accounting for Hedging Activities.” This ASU’s objectives are to (1) improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities by better aligning the entity’s financial reporting for hedging relationships with those risk management activities; and (2) reduce the complexity of and simplify the application of hedge accounting by preparers. ASU No. 2017-12 is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. The Company currently does not designate any derivative financial instruments as formal hedging relationships, and therefore, does not utilize hedge accounting. However, the Company is currently evaluating this ASU to determine whether its provisions will enhance the Company’s ability to employ certain risk management strategies, while improving the transparency and understanding of those strategies for financial statement users. In July 2018, the FASB issued ASU No. 2018-11, “Leases - Targeted Improvements” to provide entities with relief from the costs of implementing certain aspects of the new leasing standard, ASU No. 2016-02. Specifically, under the amendments in ASU 2018-11: (1) entities may elect not to recast the comparative periods presented when transitioning to the new leasing standard, and (2) lessors may elect not to separate lease and non-lease components when certain conditions are met. The amendments have the same effective date as ASU 2016-02 (January 1, 2019 for the Company). The Company adopted ASU 2018-11 on its required effective date of January 1, 2019 and elected both transition options mentioned above. ASU 2018-11 did not have a material impact on the Company’s Consolidated Financial Statements. In August 2018, the FASB issued ASU No. 2018-13, “Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU eliminates, adds and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU No. 2018-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted. Entities are also allowed to elect early adoption of the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. As ASU No. 2018-13 only revises disclosure requirements, it will not have a material impact on the Company’s Consolidated Financial Statements. In December 2018, the FASB issued ASU No. 2018-20, “Narrow-Scope Improvements for Lessors.” This ASU (1) allows lessors to make an accounting policy election of presenting sales taxes and other similar taxes collected from lessees on a net basis, (2) requires a lessor to exclude lessor costs paid directly by a lessee to third parties on the lessor’s behalf and include lessor costs that are paid by the lessor and reimbursed by the lessee in the measurement of variable lease revenue and the associated expense, and (3) clarifies that when lessors allocate variable payments to lease and non-lease components they are required to follow the recognition guidance in the new leases standard for the lease component and other applicable guidance, such as the new revenue standard, for the non-lease component. The Company adopted ASU 2018-20 on its required effective date of January 1, 2019 and elected to present sales taxes and other similar taxes collected from lessees on a net basis as described in (1) above. ASU 2018-20 did not have a material impact on the Company’s Consolidated Financial Statements.

Restrictions on Cash and Cash_2

Restrictions on Cash and Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of cash and cash equivalents reported within the consolidated statements of condition that sum to the total of the same such amounts shown in the consolidated statements of cash flows: (dollars in thousands) December 31, December 31, Interest-Bearing Deposits in Other Banks $ 3,028 $ 3,421 Funds Sold 198,860 181,413 Cash and Due From Banks 324,081 263,017 Total Cash and Cash Equivalents $ 525,969 $ 447,851

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized cost, gross unrealized gains and losses, and fair value of investment securities	The amortized cost, gross unrealized gains and losses, and fair value of the Company’s investment securities as of December 31, 2018 , 2017 , and 2016 were as follows: (dollars in thousands) Amortized Gross Gross Fair December 31, 2018 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 394,485 $ 493 $ (2,577 ) $ 392,401 Debt Securities Issued by States and Political Subdivisions 559,800 5,227 (1,031 ) 563,996 Debt Securities Issued by U.S. Government-Sponsored Enterprises 56 — — 56 Debt Securities Issued by Corporations 224,997 — (1,857 ) 223,140 Mortgage-Backed Securities: Residential - Government Agencies 189,645 1,726 (929 ) 190,442 Residential - U.S. Government-Sponsored Enterprises 589,311 1,779 (12,563 ) 578,527 Commercial - Government Agencies 63,864 — (4,484 ) 59,380 Total Mortgage-Backed Securities 842,820 3,505 (17,976 ) 828,349 Total $ 2,022,158 $ 9,225 $ (23,441 ) $ 2,007,942 Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 353,122 $ 186 $ (1,093 ) $ 352,215 Debt Securities Issued by States and Political Subdivisions 234,602 6,150 — 240,752 Debt Securities Issued by Corporations 97,266 — (1,755 ) 95,511 Mortgage-Backed Securities: Residential - Government Agencies 1,861,874 3,886 (51,773 ) 1,813,987 Residential - U.S. Government-Sponsored Enterprises 758,835 1,590 (20,259 ) 740,166 Commercial - Government Agencies 176,393 147 (5,177 ) 171,363 Total Mortgage-Backed Securities 2,797,102 5,623 (77,209 ) 2,725,516 Total $ 3,482,092 $ 11,959 $ (80,057 ) $ 3,413,994 December 31, 2017 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 424,912 $ 2,053 $ (1,035 ) $ 425,930 Debt Securities Issued by States and Political Subdivisions 618,167 9,894 (1,042 ) 627,019 Debt Securities Issued by Corporations 268,003 199 (2,091 ) 266,111 Mortgage-Backed Securities: Residential - Government Agencies 233,268 3,129 (1,037 ) 235,360 Residential - U.S. Government-Sponsored Enterprises 619,795 420 (10,403 ) 609,812 Commercial - Government Agencies 71,999 — (3,252 ) 68,747 Total Mortgage-Backed Securities 925,062 3,549 (14,692 ) 913,919 Total $ 2,236,144 $ 15,695 $ (18,860 ) $ 2,232,979 Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 375,074 $ 18 $ (1,451 ) $ 373,641 Debt Securities Issued by States and Political Subdivisions 238,504 9,125 — 247,629 Debt Securities Issued by Corporations 119,635 123 (1,591 ) 118,167 Mortgage-Backed Securities: Residential - Government Agencies 2,229,985 9,975 (37,047 ) 2,202,913 Residential - U.S. Government-Sponsored Enterprises 763,312 911 (11,255 ) 752,968 Commercial - Government Agencies 201,660 797 (3,654 ) 198,803 Total Mortgage-Backed Securities 3,194,957 11,683 (51,956 ) 3,154,684 Total $ 3,928,170 $ 20,949 $ (54,998 ) $ 3,894,121 December 31, 2016 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 407,478 $ 2,531 $ (1,294 ) $ 408,715 Debt Securities Issued by States and Political Subdivisions 662,231 11,455 (1,887 ) 671,799 Debt Securities Issued by Corporations 273,044 5 (3,870 ) 269,179 Mortgage-Backed Securities: Residential - Government Agencies 240,412 4,577 (1,145 ) 243,844 Residential - U.S. Government-Sponsored Enterprises 511,234 971 (5,218 ) 506,987 Commercial - Government Agencies 89,544 — (4,027 ) 85,517 Total Mortgage-Backed Securities 841,190 5,548 (10,390 ) 836,348 Total $ 2,183,943 $ 19,539 $ (17,441 ) $ 2,186,041 Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 530,149 $ 1,562 $ (771 ) $ 530,940 Debt Securities Issued by States and Political Subdivisions 242,295 9,991 — 252,286 Debt Securities Issued by Corporations 135,620 416 (1,528 ) 134,508 Mortgage-Backed Securities: Residential - Government Agencies 1,940,076 20,567 (23,861 ) 1,936,782 Residential - U.S. Government-Sponsored Enterprises 752,768 798 (10,919 ) 742,647 Commercial - Government Agencies 232,089 940 (2,665 ) 230,364 Total Mortgage-Backed Securities 2,924,933 22,305 (37,445 ) 2,909,793 Total $ 3,832,997 $ 34,274 $ (39,744 ) $ 3,827,527
Analysis of the contractual maturities of investment securities	The table below presents an analysis of the contractual maturities of the Company’s investment securities as of December 31, 2018 . Debt securities issued by government agencies (Small Business Administration securities) and mortgage-backed securities are disclosed separately in the table below as these investment securities may prepay prior to their scheduled contractual maturity dates. (dollars in thousands) Amortized Fair Value Available-for-Sale: Due in One Year or Less $ 57,119 $ 57,094 Due After One Year Through Five Years 613,577 613,408 Due After Five Years Through Ten Years 92,306 94,126 Due After Ten Years 22,830 23,536 785,832 788,164 Debt Securities Issued by Government Agencies 393,506 391,429 Mortgage-Backed Securities: Residential - Government Agencies 189,645 190,442 Residential - U.S. Government-Sponsored Enterprises 589,311 578,527 Commercial - Government Agencies 63,864 59,380 Total Mortgage-Backed Securities 842,820 828,349 Total $ 2,022,158 $ 2,007,942 Held-to-Maturity: Due in One Year or Less $ 164,868 $ 164,518 Due After One Year Through Five Years 311,016 312,837 Due After Five Years Through Ten Years 201,389 203,010 Due After Ten Years 7,717 8,113 684,990 688,478 Mortgage-Backed Securities: Residential - Government Agencies 1,861,874 1,813,987 Residential - U.S. Government-Sponsored Enterprises 758,835 740,166 Commercial - Government Agencies 176,393 171,363 Total Mortgage-Backed Securities 2,797,102 2,725,516 Total $ 3,482,092 $ 3,413,994
Gross gains and losses from sale of investment securities	gains and losses from the sales of investment securities for the years ended December 31, 2018 , 2017 , and 2016 . (dollars in thousands) 2018 2017 2016 Gross Gains on Sales of Investment Securities $ — $ 12,467 $ 11,180 Gross Losses on Sales of Investment Securities (3,938 ) (2,037 ) (977 ) Net Gains (Losses) on Sales of Investment Securities $ (3,938 ) $ 10,430 $ 10,203
Schedule of investment securities in an unrealized loss position	The Company’s investment securities in an unrealized loss position, segregated by continuous length of impairment, were as follows: Less Than 12 Months 12 Months or Longer Total (dollars in thousands) Fair Value Gross Fair Value Gross Fair Value Gross December 31, 2018 Available-for-Sales: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 157,058 $ (964 ) $ 173,763 $ (1,613 ) $ 330,821 $ (2,577 ) Debt Securities Issued by States and Political Subdivisions 38,138 (59 ) 156,772 (972 ) 194,910 (1,031 ) Debt Securities Issued by Corporations 59,770 (231 ) 163,371 (1,626 ) 223,141 (1,857 ) Mortgage-Backed Securities: Residential - Government Agencies 6,299 (10 ) 19,011 (919 ) 25,310 (929 ) Residential - U.S. Government-Sponsored Enterprises — — 473,380 (12,563 ) 473,380 (12,563 ) Commercial - Government Agencies — — 59,380 (4,484 ) 59,380 (4,484 ) Total Mortgage-Backed Securities 6,299 (10 ) 551,771 (17,966 ) 558,070 (17,976 ) Total $ 261,265 $ (1,264 ) $ 1,045,677 $ (22,177 ) $ 1,306,942 $ (23,441 ) Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 99,440 $ (237 ) $ 134,239 $ (856 ) $ 233,679 $ (1,093 ) Debt Securities Issued by Corporations — — 95,511 (1,755 ) 95,511 (1,755 ) Mortgage-Backed Securities: Residential - Government Agencies 12,974 (45 ) 1,491,747 (51,728 ) 1,504,721 (51,773 ) Residential - U.S. Government-Sponsored Enterprises — — 617,000 (20,259 ) 617,000 (20,259 ) Commercial - Government Agencies 19,217 (61 ) 145,715 (5,116 ) 164,932 (5,177 ) Total Mortgage-Backed Securities 32,191 (106 ) 2,254,462 (77,103 ) 2,286,653 (77,209 ) Total $ 131,631 $ (343 ) $ 2,484,212 $ (79,714 ) $ 2,615,843 $ (80,057 ) December 31, 2017 Available-for-Sales: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 103,842 $ (599 ) $ 132,071 $ (436 ) $ 235,913 $ (1,035 ) Debt Securities Issued by States and Political Subdivisions 172,343 (1,032 ) 734 (10 ) 173,077 (1,042 ) Debt Securities Issued by Corporations 12,985 (15 ) 192,927 (2,076 ) 205,912 (2,091 ) Mortgage-Backed Securities: Residential - Government Agencies 11,035 (4 ) 10,618 (1,033 ) 21,653 (1,037 ) Residential - U.S. Government-Sponsored Enterprises 429,342 (5,720 ) 150,887 (4,683 ) 580,229 (10,403 ) Commercial - Government Agencies — — 68,747 (3,252 ) 68,747 (3,252 ) Total Mortgage-Backed Securities 440,377 (5,724 ) 230,252 (8,968 ) 670,629 (14,692 ) Total $ 729,547 $ (7,370 ) $ 555,984 $ (11,490 ) $ 1,285,531 $ (18,860 ) Held-to-Maturity: Debt Securities Issued by the U.S. Treasury $ 254,283 $ (532 ) $ 89,391 $ (919 ) $ 343,674 $ (1,451 ) Debt Securities Issued by Corporations 25,490 (110 ) 58,869 (1,481 ) 84,359 (1,591 ) Mortgage-Backed Securities: Residential - Government Agencies 1,030,472 (12,262 ) 704,545 (24,785 ) 1,735,017 (37,047 ) Residential - U.S. Government-Sponsored Enterprises 293,530 (3,106 ) 339,232 (8,149 ) 632,762 (11,255 ) Commercial - Government Agencies 497 (5 ) 82,288 (3,649 ) 82,785 (3,654 ) Total Mortgage-Backed Securities 1,324,499 (15,373 ) 1,126,065 (36,583 ) 2,450,564 (51,956 ) Total $ 1,604,272 $ (16,015 ) $ 1,274,325 $ (38,983 ) $ 2,878,597 $ (54,998 )
Interest income from taxable and non-taxable investment securities.	Interest income from taxable and non-taxable investment securities for the years ended December 31, 2018 , 2017 , and 2016 were as follows: Year Ended December 31, (dollars in thousands) 2018 2017 2016 Taxable $ 115,947 $ 108,787 $ 100,541 Non-Taxable 18,515 19,725 20,438 Total Interest Income from Investment Securities $ 134,462 $ 128,512 $ 120,979
Schedule of carrying value of company's federal home loan bank and federal reserve bank	As of December 31, 2018 and 2017 , the carrying value of the Company’s Federal Home Loan Bank of Des Moines (“FHLB Des Moines”) stock and Federal Reserve Bank stock was as follows: December 31, (dollars in thousands) 2018 2017 Federal Home Loan Bank Stock $ 15,000 $ 20,000 Federal Reserve Bank Stock 20,858 20,645 Total $ 35,858 $ 40,645

Loans and Leases and the Allo_2

Loans and Leases and the Allowance for Loan and Lease Losses (Tables)	12 Months Ended
	Dec. 31, 2018
Loans and Leases and Allowance for Loan and Lease Losses [Abstract]
Schedule of loan and lease portfolio	The Company’s loan and lease portfolio was comprised of the following as of December 31, 2018 and 2017 : December 31, (dollars in thousands) 2018 2017 Commercial Commercial and Industrial $ 1,331,149 $ 1,279,347 Commercial Mortgage 2,302,356 2,103,967 Construction 170,061 202,253 Lease Financing 176,226 180,931 Total Commercial 3,979,792 3,766,498 Consumer Residential Mortgage 3,673,796 3,466,773 Home Equity 1,681,442 1,585,455 Automobile 658,133 528,474 Other 1 455,611 449,747 Total Consumer 6,468,982 6,030,449 Total Loans and Leases $ 10,448,774 $ 9,796,947 1 Comprised of other revolving credit, installment, and lease financing.
Schedule of portfolio segment and balance in Allowance disaggregated on the basis of impairment measurement method	The following presents by portfolio segment, the activity in the Allowance for the years ended December 31, 2018 , 2017 , and 2016 . The following also presents by portfolio segment, the balance in the Allowance disaggregated on the basis of the Company’s impairment measurement method and the related recorded investment in loans and leases as of December 31, 2018 , 2017 , and 2016 . (dollars in thousands) Commercial Consumer Total For the Year Ended December 31, 2018 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 65,822 $ 41,524 $ 107,346 Loans and Leases Charged-Off (1,505 ) (23,059 ) (24,564 ) Recoveries on Loans and Leases Previously Charged-Off 2,039 8,447 10,486 Net Loans and Leases Recovered (Charged-Off) 534 (14,612 ) (14,078 ) Provision for Credit Losses 518 12,907 13,425 Balance at End of Period $ 66,874 $ 39,819 $ 106,693 As of December 31, 2018 Allowance for Loan and Lease Losses: Individually Evaluated for Impairment $ 222 $ 3,754 $ 3,976 Collectively Evaluated for Impairment 66,652 36,065 102,717 Total $ 66,874 $ 39,819 $ 106,693 Recorded Investment in Loans and Leases: Individually Evaluated for Impairment $ 12,298 $ 42,327 $ 54,625 Collectively Evaluated for Impairment 3,967,494 6,426,655 10,394,149 Total $ 3,979,792 $ 6,468,982 $ 10,448,774 For the Year Ended December 31, 2017 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 65,680 $ 38,593 $ 104,273 Loans and Leases Charged-Off (1,408 ) (21,847 ) (23,255 ) Recoveries on Loans and Leases Previously Charged-Off 1,485 7,943 9,428 Net Loans and Leases Recovered (Charged-Off) 77 (13,904 ) (13,827 ) Provision for Credit Losses 65 16,835 16,900 Balance at End of Period $ 65,822 $ 41,524 $ 107,346 As of December 31, 2017 Allowance for Loan and Lease Losses: Individually Evaluated for Impairment $ 141 $ 3,775 $ 3,916 Collectively Evaluated for Impairment 65,681 37,749 103,430 Total $ 65,822 $ 41,524 $ 107,346 Recorded Investment in Loans and Leases: Individually Evaluated for Impairment $ 20,216 $ 41,002 $ 61,218 Collectively Evaluated for Impairment 3,746,282 5,989,447 9,735,729 Total $ 3,766,498 $ 6,030,449 $ 9,796,947 For the Year Ended December 31, 2016 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 60,714 $ 42,166 $ 102,880 Loans and Leases Charged-Off (865 ) (17,644 ) (18,509 ) Recoveries on Loans and Leases Previously Charged-Off 8,137 7,015 15,152 Net Loans and Leases Recovered (Charged-Off) 7,272 (10,629 ) (3,357 ) Provision for Credit Losses (2,306 ) 7,056 4,750 Balance at End of Period $ 65,680 $ 38,593 $ 104,273 As of December 31, 2016 Allowance for Loan and Lease Losses: Individually Evaluated for Impairment $ 45 $ 3,510 $ 3,555 Collectively Evaluated for Impairment 65,635 35,083 100,718 Total $ 65,680 $ 38,593 $ 104,273 Recorded Investment in Loans and Leases: Individually Evaluated for Impairment $ 21,572 $ 39,126 $ 60,698 Collectively Evaluated for Impairment 3,596,120 5,292,967 8,889,087 Total $ 3,617,692 $ 5,332,093 $ 8,949,785
Schedule of recorded investment in loans and leases by class and by credit quality indicator	The following presents by class and by credit quality indicator, the recorded investment in the Company’s loans and leases as of December 31, 2018 and 2017 . December 31, 2018 (dollars in thousands) Commercial Commercial Construction Lease Total Pass $ 1,302,278 $ 2,256,128 $ 168,740 $ 175,223 $ 3,902,369 Special Mention 17,688 30,468 — 5 48,161 Classified 11,183 15,760 1,321 998 29,262 Total $ 1,331,149 $ 2,302,356 $ 170,061 $ 176,226 $ 3,979,792 (dollars in thousands) Residential Home Automobile Other 1 Total Pass $ 3,668,475 $ 1,677,193 657,620 $ 454,697 $ 6,457,985 Classified 5,321 4,249 513 914 10,997 Total $ 3,673,796 $ 1,681,442 $ 658,133 $ 455,611 $ 6,468,982 Total Recorded Investment in Loans and Leases $ 10,448,774 December 31, 2017 (dollars in thousands) Commercial Commercial Construction Lease Total Pass $ 1,234,738 $ 2,046,745 $ 198,926 $ 180,522 $ 3,660,931 Special Mention 15,394 35,762 6 11 51,173 Classified 29,215 21,460 3,321 398 54,394 Total $ 1,279,347 $ 2,103,967 $ 202,253 $ 180,931 $ 3,766,498 (dollars in thousands) Residential Home Automobile Other 1 Total Pass $ 3,457,531 $ 1,580,917 $ 527,587 $ 449,008 $ 6,015,043 Classified 9,242 4,538 887 739 15,406 Total $ 3,466,773 $ 1,585,455 $ 528,474 $ 449,747 $ 6,030,449 Total Recorded Investment in Loans and Leases $ 9,796,947 1 Comprised of other revolving credit, installment, and lease financing.
Schedule of aging analysis by class of loan and lease portfolio	The following presents by class, an aging analysis of the Company’s loan and lease portfolio as of December 31, 2018 and 2017 . (dollars in thousands) 30 - 59 60 - 89 Past Due Non- Total Current Total Loans Non-Accrual 2 As of December 31, 2018 Commercial Commercial and Industrial $ 3,653 $ 118 $ 10 $ 542 $ 4,323 $ 1,326,826 $ 1,331,149 $ 515 Commercial Mortgage 561 — — 2,040 2,601 2,299,755 2,302,356 2,040 Construction — — — — — 170,061 170,061 — Lease Financing — — — — — 176,226 176,226 — Total Commercial 4,214 118 10 2,582 6,924 3,972,868 3,979,792 2,555 Consumer Residential Mortgage 5,319 638 2,446 5,321 13,724 3,660,072 3,673,796 1,203 Home Equity 3,323 1,581 2,684 3,671 11,259 1,670,183 1,681,442 765 Automobile 12,372 2,240 513 — 15,125 643,008 658,133 — Other 1 2,913 1,245 914 — 5,072 450,539 455,611 — Total Consumer 23,927 5,704 6,557 8,992 45,180 6,423,802 6,468,982 1,968 Total $ 28,141 $ 5,822 $ 6,567 $ 11,574 $ 52,104 $ 10,396,670 $ 10,448,774 $ 4,523 As of December 31, 2017 Commercial Commercial and Industrial $ 4,196 $ 641 $ — $ 448 $ 5,285 $ 1,274,062 $ 1,279,347 $ 313 Commercial Mortgage 187 404 — 1,398 1,989 2,101,978 2,103,967 465 Construction — — — — — 202,253 202,253 — Lease Financing — — — — — 180,931 180,931 — Total Commercial 4,383 1,045 — 1,846 7,274 3,759,224 3,766,498 778 Consumer Residential Mortgage 7,815 2,008 2,703 9,243 21,769 3,445,004 3,466,773 806 Home Equity 2,532 2,736 1,624 3,991 10,883 1,574,572 1,585,455 1,312 Automobile 11,728 2,232 886 — 14,846 513,628 528,474 — Other 1 3,007 1,639 1,934 — 6,580 443,167 449,747 — Total Consumer 25,082 8,615 7,147 13,234 54,078 5,976,371 6,030,449 2,118 Total $ 29,465 $ 9,660 $ 7,147 $ 15,080 $ 61,352 $ 9,735,595 $ 9,796,947 $ 2,896 1 Comprised of other revolving credit, installment, and lease financing. 2 Represents non-accrual loans that are not past due 30 days or more; however, full payment of principal and interest is still not expected.
Schedule of information related to impaired loans as of the balance sheet date	The following presents by class, information related to impaired loans as of December 31, 2018 and 2017 . (dollars in thousands) Recorded Unpaid Related December 31, 2018 Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 4,587 $ 4,587 $ — Commercial Mortgage 2,712 6,212 — Construction 1,321 1,321 — Total Commercial 8,620 12,120 — Total Impaired Loans with No Related Allowance Recorded $ 8,620 $ 12,120 $ — Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 1,856 $ 2,099 $ 130 Commercial Mortgage 1,822 1,822 92 Total Commercial 3,678 3,921 222 Consumer Residential Mortgage 19,753 23,635 3,051 Home Equity 3,359 3,359 350 Automobile 17,117 17,117 296 Other 1 2,098 2,098 57 Total Consumer 42,327 46,209 3,754 Total Impaired Loans with an Allowance Recorded $ 46,005 $ 50,130 $ 3,976 Impaired Loans: Commercial $ 12,298 $ 16,041 $ 222 Consumer 42,327 46,209 3,754 Total Impaired Loans $ 54,625 $ 62,250 $ 3,976 December 31, 2017 Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 8,094 $ 15,747 $ — Commercial Mortgage 8,696 12,196 — Construction 1,415 1,415 — Total Commercial 18,205 29,358 — Total Impaired Loans with No Related Allowance Recorded $ 18,205 $ 29,358 $ — Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 811 $ 811 $ 21 Commercial Mortgage 1,200 1,200 120 Total Commercial 2,011 2,011 141 Consumer Residential Mortgage 21,581 26,324 3,118 Home Equity 1,965 1,965 276 Automobile 14,811 14,811 305 Other 1 2,645 2,645 76 Total Consumer 41,002 45,745 3,775 Total Impaired Loans with an Allowance Recorded $ 43,013 $ 47,756 $ 3,916 Impaired Loans: Commercial $ 20,216 $ 31,369 $ 141 Consumer 41,002 45,745 3,775 Total Impaired Loans $ 61,218 $ 77,114 $ 3,916 1 Comprised of other revolving credit and installment financing.
Schedule of the average recorded investment and interest income recognized on impaired loans	The following presents by class, information related to the average recorded investment and interest income recognized on impaired loans for the years ended December 31, 2018 and 2017 . Year Ended Year Ended (dollars in thousands) Average Interest Average Interest Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 6,342 $ 310 $ 8,810 $ 351 Commercial Mortgage 4,642 160 9,251 299 Construction 1,360 69 1,464 94 Total Commercial 12,344 539 19,525 744 Total Impaired Loans with No Related Allowance Recorded $ 12,344 $ 539 $ 19,525 $ 744 Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 1,475 $ 100 $ 709 $ 42 Commercial Mortgage 623 25 690 54 Total Commercial 2,098 125 1,399 96 Consumer Residential Mortgage 20,324 1,080 22,981 845 Home Equity 2,676 121 1,707 82 Automobile 16,190 1,116 12,235 825 Other 1 2,624 215 2,571 215 Total Consumer 41,814 2,532 39,494 1,967 Total Impaired Loans with an Allowance Recorded $ 43,912 $ 2,657 $ 40,893 $ 2,063 Impaired Loans: Commercial $ 14,442 $ 664 $ 20,924 $ 840 Consumer 41,814 2,532 39,494 1,967 Total Impaired Loans $ 56,256 $ 3,196 $ 60,418 $ 2,807 1 Comprised of other revolving credit and installment financing.
Schedule of loans modified as a TDR	The following presents by class, information related to loans modified in a TDR during the years ended December 31, 2018 and 2017 . Loans Modified as a TDR for the Loans Modified as a TDR for the Troubled Debt Restructurings (dollars in thousands ) Number of Recorded 1 Increase in Number of Recorded 1 Increase in Commercial Commercial and Industrial 12 $ 1,449 $ 96 13 $ 7,299 $ 11 Commercial Mortgage 1 1,650 74 4 2,336 93 Total Commercial 13 3,099 170 17 9,635 104 Consumer Residential Mortgage 6 1,458 200 2 368 1 Home Equity 9 1,438 77 4 604 13 Automobile 366 7,400 128 424 8,623 177 Other 2 138 927 25 171 1,395 35 Total Consumer 519 11,223 430 601 10,990 226 Total 532 $ 14,322 $ 600 618 $ 20,625 $ 330 1 The period end balances reflect all partial paydowns and charge-offs since the modification date. TDRs fully paid off, charged off, or foreclosed upon by period end are not included. 2 Comprised of other revolving credit and installment financing.
Schedule of loans modified in a TDR that defaulted during the year, and within twelve months of their modification date by class	The following presents by class, loans modified in a TDR that defaulted during the year ended December 31, 2018 and 2017 , and within twelve months of their modification date. A TDR is considered to be in default once it becomes 60 days or more past due following a modification. Year Ended December 31, 2018 Year Ended December 31, 2017 TDRs that Defaulted During the Period, (dollars in thousands) Number of Recorded 1 Number of Recorded 1 Commercial Commercial and Industrial 1 $ 3 1 $ 48 Commercial Mortgage — — 1 341 Total Commercial 1 3 2 389 Consumer Residential Mortgage — — 1 94 Home Equity — — 1 237 Automobile 38 680 28 515 Other 2 34 194 36 208 Total Consumer 72 874 66 1,054 Total 73 $ 877 68 $ 1,443 1 The period end balances reflect all paydowns and charge-offs since the modification date. TDRs fully paid off, charged off, or foreclosed upon by period end are not included.

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2018
Transfers and Servicing of Financial Assets [Abstract]
Analysis of mortgage servicing rights accounted for under the fair value measurement method	For the years ended December 31, 2018 , 2017 , and 2016 , the change in the fair value of the Company’s mortgage servicing rights accounted for under the fair value measurement method was as follows: (dollars in thousands) 2018 2017 2016 Balance at Beginning of Year $ 1,454 $ 1,655 $ 1,970 Changes in Fair Value: Due to Payoffs (164 ) (201 ) (315 ) Total Changes in Fair Value of Mortgage Servicing Rights (164 ) (201 ) (315 ) Balance at End of Year $ 1,290 $ 1,454 $ 1,655
Analysis of mortgage servicing rights accounted for under the amortization method	For the years ended December 31, 2018 , 2017 , and 2016 , the change in the carrying value of the Company’s mortgage servicing rights accounted for under the amortization method, net of valuation allowance was as follows: (dollars in thousands) 2018 2017 2016 Balance at Beginning of Year $ 23,168 $ 22,008 $ 21,032 Servicing Rights that Resulted From Asset Transfers 2,470 3,976 3,847 Amortization (2,618 ) (2,816 ) (2,892 ) Valuation Allowance Recovery (Provision) — — 21 Balance at End of Year $ 23,020 $ 23,168 $ 22,008 Valuation Allowance: Balance at Beginning of Year $ — $ — $ (21 ) Valuation Allowance Recovery (Provision) — — 21 Balance at End of Year $ — $ — $ — Fair Value: Balance at Beginning of Year $ 26,716 $ 25,148 $ 24,804 Balance at End of Year $ 29,218 $ 26,716 $ 25,148
Schedule of key data and assumptions used in estimating the fair value of mortgage servicing rights	The key data and assumptions used in estimating the fair value of the Company’s mortgage servicing rights as of December 31, 2018 and 2017 were as follows: December 31, 2018 2017 Weighted-Average Constant Prepayment Rate 1 7.01 % 8.50 % Weighted-Average Life (in years) 7.89 7.09 Weighted-Average Note Rate 4.06 % 4.04 % Weighted-Average Discount Rate 2 9.59 % 8.87 % 1 Represents annualized loan prepayment rate assumption. 2 Derived from multiple interest rate scenarios that incorporate a spread to a market yield curve and market volatilities.
Schedule of sensitivity analysis of the fair value of mortgage servicing rights	A sensitivity analysis of the Company’s fair value of mortgage servicing rights to changes in certain key assumptions as of December 31, 2018 and 2017 is presented in the following table. December 31, (dollars in thousands) 2018 2017 Constant Prepayment Rate Decrease in fair value from 25 basis points (“bps”) adverse change $ (361 ) $ (332 ) Decrease in fair value from 50 bps adverse change (716 ) (657 ) Discount Rate Decrease in fair value from 25 bps adverse change (325 ) (289 ) Decrease in fair value from 50 bps adverse change (643 ) (572 )

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule of premises and equipment	The components of the Company’s premises and equipment as of December 31, 2018 and 2017 were as follows: (dollars in thousands) Cost Accumulated Net Book Value December 31, 2018 Premises $ 339,441 $ (238,450 ) $ 100,991 Equipment 120,165 (71,767 ) 48,398 Capital Leases 6,593 (4,145 ) 2,448 Total $ 466,199 $ (314,362 ) $ 151,837 December 31, 2017 Premises $ 331,566 $ (243,069 ) $ 88,497 Equipment 130,228 (90,319 ) 39,909 Capital Leases 6,593 (4,073 ) 2,520 Total $ 468,387 $ (337,461 ) $ 130,926

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of other assets	The components of the Company’s other assets as of December 31, 2018 and 2017 were as follows: December 31, (dollars in thousands) 2018 2017 Federal Home Loan Bank and Federal Reserve Bank Stock $ 35,858 $ 40,645 Derivative Financial Instruments 14,604 10,518 Low-Income Housing and Other Equity Investments 85,860 87,632 Deferred Compensation Plan Assets 31,871 29,230 Prepaid Expenses 8,533 7,944 Accounts Receivable 1 18,996 49,264 Other 1 35,160 27,363 Total Other Assets $ 230,882 $ 252,596 1 Certain prior period information has been reclassified to conform to current presentation.

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Deposits [Abstract]
Schedule of time deposits with contractual maturities	Time Deposits As of December 31, 2018 and 2017 , the Company’s total time deposits were $1.7 billion . As of December 31, 2018 , the contractual maturities of these time deposits were as follows: (dollars in thousands) Amount 2019 $ 1,441,580 2020 119,894 2021 115,528 2022 32,881 2023 28,035 Thereafter 7,604 Total $ 1,745,522
Schedule of time deposits with balances of $100,000 or more with contractual maturities	The amount of time deposits with balances of $100,000 or more was $1.5 billion and $1.4 billion as of December 31, 2018 and 2017 , respectively. As of December 31, 2018 , the contractual maturities of these time deposits were as follows: (dollars in thousands) Amount Three Months or Less $ 756,146 Over Three Months through Six Months 197,485 Over Six Months through Twelve Months 352,539 Over Twelve Months 191,839 Total $ 1,498,009

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2018
Borrowings Disclosure Abstract
Schedule of details of short-term borrowings	Details of the Company’s short-term borrowings (original term of one year or less) as of December 31, 2018 and 2017 were as follows: December 31, (dollars in thousands) 2018 2017 Securities Sold Under Agreements to Repurchase (short-term) 1 Amounts Outstanding $ 4,196 $ 1,603 Weighted-Average Interest Rate 1.19 % 0.14 % 1 Consists entirely of repurchase agreements with government entities. Excludes long-term repurchase agreements with government entities of $0.1 million and $3.7 million as of December 31, 2018 , and 2017 , respectively, and long-term repurchase agreements with private institutions of $500.0 million as of December 31, 2018 and 2017 .

Other Debt (Tables)

Other Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of other debt	The Company’s other debt as of December 31, 2018 and 2017 were as follows: December 31, (dollars in thousands) 2018 2017 Federal Home Loan Bank Advances $ 125,000 $ 250,000 Capital Lease Obligations 10,643 10,716 Total $ 135,643 $ 260,716
Schedule of annual maturities of long-term debt, exclusive of capital lease obligations	As of December 31, 2018 , the annual maturities of the Company’s other debt, exclusive of capital lease obligations, were expected to be as follows: (dollars in thousands) Amount 2019 $ 50,000 2020 75,000 2021 — 2022 — 2023 — Thereafter — Total $ 125,000

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Schedule of minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts and ratios for the Company and the Bank	The table below sets forth the minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts and ratios for the Company and the Bank as of December 31, 2018 and 2017 : (dollars in thousands) Well Capitalized Company Bank As of December 31, 2018 Shareholders’ Equity $ 1,268,200 $ 1,195,132 Common Equity Tier 1 Capital 1,290,723 1,229,227 Tier 1 Capital 1,290,723 1,229,227 Total Capital 1,404,238 1,342,742 Common Equity Tier 1 Capital Ratio 6.5 % 13.07 % 12.46 % Tier 1 Capital Ratio 8.0 % 13.07 % 12.46 % Total Capital Ratio 10.0 % 14.21 % 13.61 % Tier 1 Leverage Ratio 5.0 % 7.60 % 7.24 % As of December 31, 2017 Shareholders’ Equity $ 1,231,868 $ 1,161,037 Common Equity Tier 1 Capital 1,238,063 1,178,804 Tier 1 Capital 1,238,063 1,178,804 Total Capital 1,352,231 1,292,972 Common Equity Tier 1 Capital Ratio 6.5 % 13.24 % 12.62 % Tier 1 Capital Ratio 8.0 % 13.24 % 12.62 % Total Capital Ratio 10.0 % 14.46 % 13.85 % Tier 1 Leverage Ratio 5.0 % 7.26 % 6.92 %
Components of other comprehensive income	The following table presents the components of other comprehensive income (loss), net of tax: (dollars in thousands) Before Tax Tax Effect Net of Tax Year Ended December 31, 2018 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ (11,051 ) $ (2,931 ) $ (8,120 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 2,164 569 1,595 Net Unrealized Gains (Losses) on Investment Securities (8,887 ) (2,362 ) (6,525 ) Defined Benefit Plans: Net Actuarial Gains (Losses) Arising During the Period (4,468 ) (1,184 ) (3,284 ) Amortization of Net Actuarial Losses (Gains) 1,835 460 1,375 Amortization of Prior Service Credit (567 ) (150 ) (417 ) Defined Benefit Plans, Net (3,200 ) (874 ) (2,326 ) Other Comprehensive Income (Loss) $ (12,087 ) $ (3,236 ) $ (8,851 ) Year Ended December 31, 2017 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ (5,263 ) $ (2,078 ) $ (3,185 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 1,982 783 1,199 Net Unrealized Gains (Losses) on Investment Securities (3,281 ) (1,295 ) (1,986 ) Defined Benefit Plans: Net Actuarial Gains (Losses) Arising During the Period 884 349 535 Amortization of Net Actuarial Losses (Gains) 1,382 545 837 Amortization of Prior Service Credit (322 ) (127 ) (195 ) Defined Benefit Plans, Net 1,944 767 1,177 Other Comprehensive Income (Loss) $ (1,337 ) $ (528 ) $ (809 ) Year Ended December 31, 2016 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ (18,647 ) $ (7,358 ) $ (11,289 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 1,605 634 971 Net Unrealized Gains (Losses) on Investment Securities (17,042 ) (6,724 ) (10,318 ) Defined Benefit Plans: Net Actuarial Gains (Losses) Arising During the Period (954 ) (377 ) (577 ) Amortization of Net Actuarial Losses (Gains) 1,224 483 741 Amortization of Prior Service Credit (322 ) (127 ) (195 ) Defined Benefit Plans, Net (52 ) (21 ) (31 ) Other Comprehensive Income (Loss) $ (17,094 ) $ (6,745 ) $ (10,349 ) 1 The amount relates to the amortization/accretion of unrealized gains and losses related to the Company's reclassification of available-for-sale investment securities to the held-to-maturity category.
Schedule of accumulated other comprehensive income (loss)	The following table presents the changes in each component of accumulated other comprehensive income (loss), net of tax: (dollars in thousands) Investment Securities-Available-For-Sale Investment Securities-Held-To-Maturities Defined Benefit Plans Accumulated Other Comprehensive Income (Loss) Year Ended December 31, 2018 Balance at Beginning of Period $ (1,915 ) $ (5,085 ) $ (27,715 ) $ (34,715 ) Other Comprehensive Income (Loss) Before Reclassifications (8,120 ) — (3,284 ) (11,404 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 1,595 958 2,553 Total Other Comprehensive Income (Loss) (8,120 ) 1,595 (2,326 ) (8,851 ) Reclassification of the Income Tax Effects of the Tax Act from AOCI (412 ) (1,096 ) (5,969 ) (7,477 ) Balance at End of Period $ (10,447 ) $ (4,586 ) $ (36,010 ) $ (51,043 ) Year Ended December 31, 2017 Balance at Beginning Period $ 1,270 $ (6,284 ) $ (28,892 ) $ (33,906 ) Other Comprehensive Income (Loss) Before Reclassifications (3,185 ) — 535 (2,650 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 1,199 642 1,841 Total Other Comprehensive Income (Loss) (3,185 ) 1,199 1,177 (809 ) Balance at End of Period $ (1,915 ) $ (5,085 ) $ (27,715 ) $ (34,715 ) Year Ended December 31, 2016 Balance at Beginning Period $ 12,559 $ (7,255 ) $ (28,861 ) $ (23,557 ) Other Comprehensive Income (Loss) Before Reclassifications (11,289 ) — (577 ) (11,866 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 971 546 1,517 Total Other Comprehensive Income (Loss) (11,289 ) 971 (31 ) (10,349 ) Balance at End of Period $ 1,270 $ (6,284 ) $ (28,892 ) $ (33,906 )
Reclassification out of accumulated other comprehensive income	The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss): Details about Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified from Accumulated Other Comprehensive Income (Loss) 1 Affected Line Item in the Statement Where Net Income Is Presented (dollars in thousands) Year Ended December 31, 2018 2017 2016 Amortization of Unrealized Holding Gains (Losses) on Investment Securities Held-to-Maturity $ (2,164 ) $ (1,982 ) $ (1,605 ) Interest Income 569 783 634 Provision for Income Tax (1,595 ) (1,199 ) (971 ) Net of Tax Amortization of Defined Benefit Plans Items Prior Service Credit 2 567 322 322 Net Actuarial Losses 2 (1,835 ) (1,382 ) (1,224 ) (1,268 ) (1,060 ) (902 ) Total Before Tax 310 418 356 Provision for Income Tax (958 ) (642 ) (546 ) Net of Tax Total Reclassifications for the Period $ (2,553 ) $ (1,841 ) $ (1,517 ) Net of Tax 1 Amounts in parentheses indicate reductions to net income. 2

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Reconciliation of the weighted average number of common shares outstanding for computing diluted earnings per share and antidilutive stock options and restricted stock outstanding	The following is a reconciliation of the weighted average number of common shares outstanding for computing diluted earnings per share and antidilutive stock options and restricted stock outstanding for the years ended December 31, 2018 , 2017 , and 2016 : Weighted Average Shares 2018 2017 2016 Denominator for Basic Earnings Per Share 41,714,770 42,280,931 42,644,100 Dilutive Effect of Equity Based Awards 284,629 326,126 235,683 Denominator for Diluted Earnings Per Share 41,999,399 42,607,057 42,879,783 Antidilutive Stock Options and Restricted Stock Outstanding — — —

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Selected business segment financial information	Selected business segment financial information as of and for the years ended December 31, 2018 , 2017 , and 2016 were as follows: (dollars in thousands) Retail Commercial Investment Services and Private Banking Treasury Consolidated Year Ended December 31, 2018 Net Interest Income $ 264,459 $ 179,577 $ 41,222 $ 1,094 $ 486,352 Provision for Credit Losses 14,898 (760 ) (61 ) (652 ) 13,425 Net Interest Income After Provision for Credit Losses 249,561 180,337 41,283 1,746 472,927 Noninterest Income 79,004 23,733 55,338 10,848 168,923 Noninterest Expense (211,761 ) (81,344 ) (65,847 ) (12,672 ) (371,624 ) Income Before Provision for Income Taxes 116,804 122,726 30,774 (78 ) 270,226 Provision for Income Taxes (29,172 ) (28,496 ) (8,113 ) 15,157 (50,624 ) Net Income $ 87,632 $ 94,230 $ 22,661 $ 15,079 $ 219,602 Total Assets as of December 31, 2018 $ 6,365,263 $ 3,958,523 $ 349,832 $ 6,470,356 $ 17,143,974 Year Ended December 31, 2017 Net Interest Income $ 264,041 $ 171,038 $ 29,693 $ (7,534 ) $ 457,238 Provision for Credit Losses 14,008 (160 ) (21 ) 3,073 16,900 Net Interest Income After Provision for Credit Losses 250,033 171,198 29,714 (10,607 ) 440,338 Noninterest Income 85,042 21,670 57,105 21,600 185,417 Noninterest Expense (209,807 ) (74,209 ) (61,674 ) (12,001 ) (357,691 ) Income Before Provision for Income Taxes 125,268 118,659 25,145 (1,008 ) 268,064 Provision for Income Taxes (44,545 ) (41,797 ) (9,303 ) 12,253 (83,392 ) Net Income $ 80,723 $ 76,862 $ 15,842 $ 11,245 $ 184,672 Total Assets as of December 31, 2017 $ 5,936,568 $ 3,742,991 $ 336,455 $ 7,073,038 $ 17,089,052 Year Ended December 31, 2016 Net Interest Income $ 242,967 $ 156,080 $ 24,714 $ (6,182 ) $ 417,579 Provision for Credit Losses 10,700 (7,322 ) (23 ) 1,395 4,750 Net Interest Income After Provision for Credit Losses 232,267 163,402 24,737 (7,577 ) 412,829 Noninterest Income 91,824 26,967 57,396 21,156 197,343 Noninterest Expense (208,389 ) (70,405 ) (59,782 ) (12,002 ) (350,578 ) Income Before Provision for Income Taxes 115,702 119,964 22,351 1,577 259,594 Provision for Income Taxes (41,067 ) (42,667 ) (8,270 ) 13,871 (78,133 ) Net Income $ 74,635 $ 77,297 $ 14,081 $ 15,448 $ 181,461 Total Assets as of December 31, 2016 $ 5,342,078 $ 3,565,912 $ 280,410 $ 7,303,967 $ 16,492,367

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Schedule of reconciliation of changes in the benefit obligation and the fair value of plan assets, as well as the funded status recognized in the consolidated statements of condition for the pension plans and postretirement benefit plan	The following table provides a reconciliation of changes in benefit obligation and fair value of plan assets, as well as the funded status recognized in the Company’s consolidated statements of condition for the Pension Plans and postretirement benefit plan for the years ended December 31, 2018 and 2017 . Pension Benefits Postretirement Benefits (dollars in thousands) 2018 2017 2018 2017 Benefit Obligation at Beginning of Year $ 110,080 $ 107,593 $ 24,206 $ 24,308 Service Cost — — 457 453 Interest Cost 4,193 4,665 936 1,093 Plan Amendment 3 — — — (2,730 ) Actuarial Losses (Gains) (5,031 ) 6,828 (869 ) 2,052 Employer Benefits Paid 1 (6,580 ) (9,006 ) (1,278 ) (970 ) Benefit Obligation at End of Year $ 102,662 $ 110,080 $ 23,452 $ 24,206 Fair Value of Plan Assets at Beginning of Year $ 96,908 $ 83,383 $ — $ — Actual Return on Plan Assets (5,246 ) 12,047 — — Employer Contributions 471 10,484 1,278 970 Employer Benefits Paid 1 (6,580 ) (9,006 ) (1,278 ) (970 ) Fair Value of Plan Assets at End of Year $ 85,553 $ 96,908 $ — $ — Funded Status at End of Year 2 $ (17,109 ) $ (13,172 ) $ (23,452 ) $ (24,206 ) 1 Participants' contributions relative to the postretirement benefit plan were offset against employer benefits paid in the table above. Participants' contributions for postretirement benefits were $0.6 million and $0.5 million for the years ended December 31, 2018 and 2017 , respectively. 2 Amounts are recognized in Retirement Benefits Payable in the consolidated statements of condition.
Schedule of amounts recognized in accumulated other comprehensive income (loss)	The following presents the amounts recognized in the Company’s accumulated other comprehensive income for the Pension Plans and postretirement benefit plan as of December 31, 2018 and 2017 . Pension Benefits Postretirement Benefits (dollars in thousands) 2018 2017 2018 2017 Amounts Recognized in Accumulated Other Net Actuarial Gains (Losses) $ (42,127 ) $ (32,730 ) $ 4,261 $ 3,143 Net Prior Service Credit — — 1,856 1,872 Total Amounts Recognized in Accumulated Other $ (42,127 ) $ (32,730 ) $ 6,117 $ 5,015
Schedule of components of net periodic benefit cost	Components of net periodic benefit cost for the Company’s Pension Plans and the postretirement benefit plan are presented in the following table for the years ended December 31, 2018 , 2017 , and 2016 . Pension Benefits Postretirement Benefits (dollars in thousands) 2018 2017 2016 2018 2017 2016 Service Cost $ — $ — $ — $ 457 $ 453 $ 513 Interest Cost 4,193 4,665 4,882 936 1,093 1,134 Expected Return on Plan Assets (5,122 ) (5,011 ) (5,121 ) — — — Amortization of: Prior Service Credit 1 — — — (567 ) (322 ) (322 ) Net Actuarial Losses (Gains) 1 2,099 1,817 1,617 (264 ) (435 ) (393 ) Net Periodic Benefit Cost $ 1,170 $ 1,471 $ 1,378 $ 562 $ 789 $ 932 1 Represents reclassification adjustments from accumulated other comprehensive income during the period.
Schedule of assumptions used to determine the benefit obligations/net periodic cost	Assumptions used to determine the benefit obligations as of December 31, 2018 and 2017 for the Company’s Pension Plans and postretirement benefit plan were as follows: Pension Benefits Postretirement Benefits 2018 2017 2018 2017 Weighted Average Assumptions as of December 31: Discount Rate 4.41 % 3.90 % 4.48 % 3.96 % Health Care Cost Trend Rate Assumed For Next Year — — 6.00 % 6.30 %
Schedule of assumptions used in calculation net periodic benefit cost	Assumptions used to determine the net periodic benefit cost for the Company’s Pension Plans and postretirement benefit plan for the years ended December 31, 2018 , 2017 , and 2016 were as follows: Pension Benefits Postretirement Benefits 2018 2017 2016 2018 2017 2016 Weighted Average Assumptions as of December 31: Discount Rate 3.90 % 4.45 % 4.70 % 3.96 % 4.57 % 4.74 % Expected Long-Term Rate of Return on Plan Assets 5.75 % 5.75 % 6.00 % — — — Health Care Cost Trend Rate — — — 6.30 % 6.50 % 6.70 %
Schedule of expected benefits to be paid in each of the next five years and in the aggregate for the five years thereafter	As of December 31, 2018 , expected benefits to be paid in each of the next five years and in the aggregate for the five years thereafter were as follows: (dollars in thousands) Pension Benefits Postretirement Benefits 2019 $ 6,918 $ 886 2020 7,020 943 2021 7,163 1,020 2022 7,189 1,137 2023 7,195 1,231 Years 2024-2028 35,466 7,982
Schedule of the fair values of the retirement plan assets by asset category	Fair Value Measurements Asset Category (dollars in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Total as of Dec. 31, 2018 Total as of Dec. 31, 2017 Cash $ 726 $ — $ — $ 726 $ 2,156 Equity Securities – Mutual Funds: Large-Cap 1,593 — — 1,593 1,748 Mixed-Cap 25,298 — — 25,298 29,459 International 21,621 — — 21,621 24,539 Emerging Market 2,150 — — 2,150 2,305 Fixed Income Securities – Mutual Funds 34,165 — — 34,165 36,701 Total $ 85,553 $ — $ — $ 85,553 $ 96,908

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 compensation expense and the related income tax benefit recognized for all share-based awards	For the years ended December 31, 2018 , 2017 , and 2016 , compensation expense and the related income tax benefit recognized for stock options and restricted stock were as follows: (dollars in thousands) 2018 2017 2016 Compensation Expense $ 8,146 $ 7,369 $ 6,787 Income Tax Benefit 2,160 2,910 2,680
Schedule of activity for restricted stock	The following table presents the activity for restricted stock: Number of Shares Weighted Average Grant Date Fair Value Unvested as of December 31, 2015 268,813 $ 55.92 Granted 121,495 64.40 Vested (105,891 ) 53.46 $ 5,661 Forfeited (13,894 ) 58.14 Unvested as of December 31, 2016 270,523 $ 60.58 Granted 124,460 84.53 Vested (52,822 ) 60.06 $ 4,493 Forfeited (22,058 ) 69.46 Unvested as of December 31, 2017 320,103 $ 69.36 Granted 120,173 83.87 Vested (110,231 ) 59.41 $ 9,081 Forfeited (15,558 ) 73.82 Unvested as of December 31, 2018 1 314,487 $ 78.17
Schedule of activity for restricted stock units	The following table presents the activity for RSU: Number of Units Weighted Average Fair Value of Restricted Balance as of December 31, 2015 135,505 $ 55.86 Granted 58,541 63.92 Vested (31,660 ) 55.17 $ 1,897 Forfeited (7,554 ) 56.08 Balance as of December 31, 2016 154,832 $ 59.04 Vested (29,281 ) 58.74 $ 2,516 Forfeited (9,062 ) 60.17 Balance as of December 31, 2017 116,489 $ 60.22 Vested (62,252 ) 57.00 $ 5,127 Forfeited (2,173 ) 63.92 Balance as of December 31, 2018 52,064 $ 63.92
Schedule of activity related to stock options	The following table presents the activity related to stock options under all plans for the year ended December 31, 2018 : Stock Weighted Weighted Aggregate Stock Options Outstanding as of January 1, 2018 303,552 $ 45.26 Exercised (39,664 ) 45.16 Stock Options Outstanding as of December 31, 2018 263,888 45.27 3.0 $ 5,818 Stock Options Vested and Exercisable as of December 31, 2018 263,888 45.27 3.0 5,818
Summary of certain stock option activity of the Company	The following summarizes certain stock option activity of the Company for the years ended December 31, 2018 , 2017 , and 2016 : (dollars in thousands) 2018 2017 2016 Intrinsic Value of Stock Options Exercised $ 1,634 $ 5,991 $ 1,990 Cash Received from Stock Options Exercised 1,791 7,502 3,546 Tax Benefits Realized from Stock Options Exercised 240 2,003 384

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of the Company's Provision for Income Taxes	The components of the Company’s provision for income taxes for the years ended December 31, 2018 , 2017 , and 2016 were as follows: (dollars in thousands) 2018 2017 2016 Current: Federal $ 45,464 $ 73,176 $ 69,061 State 11,434 6,039 1,885 Total Current 56,898 79,215 70,946 Deferred: Federal (2,172 ) 5,042 6,947 State (4,102 ) (865 ) 240 Total Deferred (6,274 ) 4,177 7,187 Provision for Income Taxes $ 50,624 $ 83,392 $ 78,133
Schedule of significant components of the Company's Deferred Tax Liabilities and Assets	As of December 31, 2018 and 2017 , significant components of the Company’s deferred tax liabilities and assets were as follows: December 31, (dollars in thousands) 2018 2017 Deferred Tax Liabilities: Accelerated Depreciation $ (2,864 ) $ — Accrued Pension Cost (11,270 ) (11,245 ) Federal Home Loan Bank Stock (3,416 ) (3,408 ) Lease Transactions (53,230 ) (57,458 ) Energy Tax Credits (5,274 ) (8,821 ) Investment in Variable Interest Entities (3,769 ) (3,407 ) Deferred Loan Fees (6,688 ) (6,903 ) Originated Mortgage Servicing Rights (6,548 ) (6,646 ) Other (1,420 ) (1,883 ) Gross Deferred Tax Liabilities (94,479 ) (99,771 ) Deferred Tax Assets: Accelerated Depreciation — 1,844 Allowance for Loan Losses 30,045 30,148 Minimum Pension Liability 12,989 12,114 Accrued Expenses 14,805 9,937 Postretirement Benefit Obligations 8,396 8,595 Capital Lease Expenses 2,172 2,168 Restricted Stock 5,178 6,223 Net Unrealized Losses on Investments Securities 5,421 3,059 Deductible State and Local Taxes 3,242 2,461 Other 4,244 5,183 Gross Deferred Tax Assets Before Valuation Allowance 86,492 81,732 Valuation Allowance (1,102 ) (955 ) Gross Deferred Tax Assets After Valuation Allowance 85,390 80,777 Net Deferred Tax Liabilities $ (9,089 ) $ (18,994 )
Schedule of reconciliation of the statutory federal income tax rate to the Company's Effective Tax Rate	The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended December 31, 2018 , 2017 , and 2016 : 2018 2017 2016 Statutory Federal Income Tax Rate 21.00 % 35.00 % 35.00 % Increase (Decrease) in Income Tax Rate Resulting From: State Taxes, Net of Federal Income Tax 2.29 1.50 0.60 Tax Reserve Adjustments 0.21 0.09 (0.18 ) Low-Income Housing Investments 0.22 (1.18 ) (0.69 ) Investment Tax Credits (1.04 ) (1.03 ) (0.85 ) Bank-Owned Life Insurance (0.55 ) (0.85 ) (0.88 ) Tax-Exempt Income (1.29 ) (2.57 ) (2.71 ) Excess Tax Benefits - Stock Compensation (0.34 ) (0.83 ) — Leveraged Lease (0.83 ) (0.03 ) (0.13 ) Tax Reform Effects (0.75 ) 1.25 — Other (0.19 ) (0.24 ) (0.06 ) Effective Tax Rate 18.73 % 31.11 % 30.10 %
Schedule of reconciliation of the Company's Liability for Unrecognized Tax Benefits	December 31, 2018 , 2017 , and 2016 : (dollars in thousands) 2018 2017 2016 Unrecognized Tax Benefits at Beginning of Year $ 5,292 $ 6,574 $ 11,602 Gross Increases, Related to Tax Positions Taken in a Prior Period 157 273 145 Gross Decreases, Related to Tax Positions Taken in a Prior Period — — (230 ) Gross Increases, Related to Current Period Tax Positions 885 1,124 395 Settlement with Taxing Authority — — (1,002 ) Lapse of Statute of Limitations (793 ) (2,679 ) (4,336 ) Unrecognized Tax Benefits at End of Year $ 5,541 $ 5,292 $ 6,574

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of the notional amount and fair value of the derivative financial instruments	The notional amount and fair value of the Company’s derivative financial instruments as of December 31, 2018 and 2017 were as follows: December 31, 2018 December 31, 2017 (dollars in thousands) Notional Amount Fair Value Notional Amount Fair Value Interest Rate Lock Commitments $ 33,133 $ 871 $ 35,422 $ 789 Forward Commitments 34,102 (352 ) 45,143 (56 ) Interest Rate Swap Agreements Receive Fixed/Pay Variable Swaps 505,034 (2,537 ) 374,670 (1,331 ) Pay Fixed/Receive Variable Swaps 505,034 6,082 374,670 1,436 Foreign Exchange Contracts 55,663 793 54,332 (13 ) Conversion Rate Swap Agreement 80,746 — 70,571 —
Derivative financial instruments, their fair values, and balance sheet location	The following table presents the Company’s derivative financial instruments, their fair values, and their location in the consolidated statements of condition as of December 31, 2018 and 2017 : December 31, 2018 December 31, 2017 Derivative Financial Instruments Not Designated 1 (dollars in thousands) Asset Liability Asset Liability Interest Rate Lock Commitments $ 877 $ 6 $ 789 $ — Forward Commitments 4 356 14 70 Interest Rate Swap Agreements 12,915 9,370 9,583 9,478 Foreign Exchange Contracts 808 15 132 145 Total $ 14,604 $ 9,747 $ 10,518 $ 9,693 1 Asset derivatives are included in other assets and liability derivatives are included in other liabilities in the consolidated statements of condition
Derivative financial instruments and the amount and location of the net gains or losses recognized in the statements of income	The following table presents the Company’s derivative financial instruments and the amount and location of the net gains or losses recognized in the consolidated statements of income for the years ended December 31, 2018 , 2017 , and 2016 : Location of Net Gains (Losses)Recognized in the Year Ended December 31, Derivative Financial Instruments Not Designated (dollars in thousands) 2018 2017 2016 Interest Rate Lock Commitments Mortgage Banking $ 3,534 $ 5,643 $ 7,834 Forward Commitments Mortgage Banking 821 (1,275 ) 1,741 Interest Rate Swap Agreements Other Noninterest Income 1,835 698 2,987 Foreign Exchange Contracts Other Noninterest Income 3,163 3,296 2,962 Conversion Rate Swap Agreement Investment Securities Gains (Losses), Net (1,000 ) — — Total $ 8,353 $ 8,362 $ 15,524

Affordable Housing Projects T_2

Affordable Housing Projects Tax Credit Partnerships (Tables)	12 Months Ended
	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	As of December 31, 2018 , the expected payments for unfunded affordable housing commitments were as follows: (dollars in thousands) Amount 2019 $ 5,506 2020 8,350 2021 61 2022 121 2023 42 Thereafter 1,118 Total Unfunded Commitments $ 15,198 The following table presents tax credits and other tax benefits recognized and amortization expense related to affordable housing for the years ended December 31, 2018 , 2017 , and 2016 . (dollars in thousands) 2018 2017 2016 Effective Yield Method Tax credits and other tax benefits recognized $ 13,572 $ 13,569 $ 13,996 Amortization Expense in Provision for Income Taxes 8,311 8,373 7,886 Proportional Amortization Method Tax credits and other tax benefits recognized $ 1,641 $ 1,040 $ — Amortization Expense in Provision for Income Taxes 1,332 800 —

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	12 Months Ended
	Dec. 31, 2018
Offsetting [Abstract]
Schedule of Repurchase Agreements - by maturity date and collateral type	The following table presents the remaining contractual maturities of the Company’s repurchase agreements as of December 31, 2018 and 2017 , disaggregated by the class of collateral pledged. Remaining Contractual Maturity of Repurchase Agreements (dollars in thousands) Up to 91-365 days 1-3 Years After Total December 31, 2018 Class of Collateral Pledged: Debt Securities Issued by the U.S. Treasury and Government Agencies $ — $ — $ 198,442 $ 117,021 $ 315,463 Debt Securities Issued by States and Political Subdivisions 1,906 1,590 — — 3,496 Mortgage-Backed Securities: Residential - Government Agencies 800 — 26,558 70,341 97,699 Residential - U.S. Government-Sponsored Enterprises — — — 87,638 87,638 Total $ 2,706 $ 1,590 $ 225,000 $ 275,000 $ 504,296 December 31, 2017 Class of Collateral Pledged: Debt Securities Issued by the U.S. Treasury and Government Agencies $ — $ — $ 110,392 $ 202,484 $ 312,876 Debt Securities Issued by States and Political Subdivisions 1,200 2,590 — — 3,790 Mortgage-Backed Securities: Residential - Government Agencies 1,503 — 18,793 80,960 101,256 Residential - U.S. Government-Sponsored Enterprises — — 20,815 66,556 87,371 Total $ 2,703 $ 2,590 $ 150,000 $ 350,000 $ 505,293
Schedule of assets and liabilities subject to an enforceable master netting arrangement	The following table presents the assets and liabilities subject to an enforceable master netting arrangement, or repurchase agreements, as of December 31, 2018 and 2017 . The swap agreements we have with our commercial banking customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table. As previously mentioned, centrally cleared swap agreements between the Company and institutional counterparties are also excluded from this table. (i) (ii) (iii) = (i)-(ii) (iv) (v) = (iii)-(iv) Gross Amounts Recognized in the Statements of Condition Gross Amounts Offset in the Statements of Condition Net Amounts Presented in the Statements of Condition Gross Amounts Not Offset in the Statements of Condition (dollars in thousands) Netting Adjustments per Master Netting Arrangements Fair Value of Collateral Pledged 1 Net Amount December 31, 2018 Assets: Interest Rate Swap Agreements: Institutional Counterparties $ 7,572 $ — $ 7,572 $ 1,490 $ — $ 6,082 Liabilities: Interest Rate Swap Agreements: Institutional Counterparties 1,490 — 1,490 1,490 — — Repurchase Agreements: Private Institutions 500,000 — 500,000 — 500,000 — Government Entities 4,296 — 4,296 — 4,296 — Total Repurchase Agreements $ 504,296 $ — $ 504,296 $ — $ 504,296 $ — December 31, 2017 Assets: Interest Rate Swap Agreements: Institutional Counterparties $ 5,453 $ — $ 5,453 $ 4,017 $ — $ 1,436 Liabilities: Interest Rate Swap Agreements: Institutional Counterparties 4,017 — 4,017 4,017 — — Repurchase Agreements: Private Institutions 500,000 — 500,000 — 500,000 — Government Entities 5,293 — 5,293 — 5,293 — Total Repurchase Agreements $ 505,293 $ — $ 505,293 $ — $ 505,293 $ — 1 The application of collateral cannot reduce the net amount below zero. Therefore, excess collateral is not reflected in this table. For swap agreements with institutional counterparties, the fair value of investment securities pledged was less than $0.1 million and $3.5 million as of December 31, 2018 and 2017 , respectively. For repurchase agreements with private institutions, the fair value of investment securities pledged was $526.7 million and $563.3 million as of December 31, 2018 and 2017 , respectively. For repurchase agreements with government entities, the fair value of investment securities pledged was $6.8 million and $6.9 million as of December 31, 2018 and 2017 , respectively.

Commitments, Contingencies, a_2

Commitments, Contingencies, and Guarantees (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Credit commitments	The Company’s credit commitments as of December 31, 2018 were as follows: (dollars in thousands) December 31, 2018 Unfunded Commitments to Extend Credit $ 2,646,085 Standby Letters of Credit 62,344 Commercial Letters of Credit 9,411 Total $ 2,717,840
Schedule of rental expense	Rental expense for all operating leases for the years ended December 31, 2018 , 2017 , and 2016 were as follows: (dollars in thousands) 2018 2017 2016 Minimum Rentals $ 19,326 $ 18,331 $ 18,377 Sublease Rental Income (7,674 ) (7,056 ) (6,551 ) Total $ 11,652 $ 11,275 $ 11,826
Schedule of future minimum payments for capital leases and non-cancelable operating leases	Future minimum payments for capital leases and non-cancelable operating leases with initial or remaining terms of one year or more consisted of the following as of December 31, 2018 : (dollars in thousands) Capital Leases Operating Leases 2019 $ 825 $ 12,455 2020 825 11,266 2021 825 11,025 2022 825 10,416 2023 825 9,482 Thereafter 23,930 104,877 Total Future Minimum Lease Payments 28,055 $ 159,521 Amounts Representing Interest (17,412 ) Present Value of Net Future Minimum Lease Payments $ 10,643

Fair Value of Assets and Liab_2

Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Balances of assets and liabilities measured at fair value on a recurring basis	The table below presents the balances of assets and liabilities measured at fair value on a recurring basis as of December 31, 2018 and 2017 : (dollars in thousands) Quoted Prices Significant Significant Total December 31, 2018 Assets: Investment Securities Available-for-Sale Debt Securities Issued by the U.S. Treasury and Government Agencies $ 972 $ 391,429 $ — $ 392,401 Debt Securities Issued by States and Political Subdivisions — 563,996 — 563,996 Debt Securities Issued by U.S. Government-Sponsored Enterprises — 56 — 56 Debt Securities Issued by Corporations — 223,140 — 223,140 Mortgage-Backed Securities: Residential - Government Agencies — 190,442 — 190,442 Residential - U.S. Government-Sponsored Enterprises — 578,527 — 578,527 Commercial - Government Agencies — 59,380 — 59,380 Total Mortgage-Backed Securities — 828,349 — 828,349 Total Investment Securities Available-for-Sale 972 2,006,970 — 2,007,942 Loans Held for Sale — 10,987 — 10,987 Mortgage Servicing Rights — — 1,290 1,290 Other Assets 31,871 — — 31,871 Derivatives 1 — 812 13,792 14,604 Total Assets Measured at Fair Value on a $ 32,843 $ 2,018,769 $ 15,082 $ 2,066,694 Liabilities: Derivatives 1 $ — $ 371 $ 9,376 $ 9,747 Total Liabilities Measured at Fair Value on a $ — $ 371 $ 9,376 $ 9,747 December 31, 2017 Assets: Investment Securities Available-for-Sale Debt Securities Issued by the U.S. Treasury and Government Agencies $ 538 $ 425,392 $ — $ 425,930 Debt Securities Issued by States and Political Subdivisions — 627,019 — 627,019 Debt Securities Issued by Corporations — 266,111 — 266,111 Mortgage-Backed Securities: Residential - Government Agencies — 235,360 — 235,360 Residential - U.S. Government-Sponsored Enterprises — 609,812 — 609,812 Commercial - Government Agencies — 68,747 — 68,747 Total Mortgage-Backed Securities — 913,919 — 913,919 Total Investment Securities Available-for-Sale 538 2,232,441 — 2,232,979 Loans Held for Sale — 19,231 — 19,231 Mortgage Servicing Rights — — 1,454 1,454 Other Assets 29,230 — — 29,230 Derivatives 1 — 146 10,372 10,518 Total Assets Measured at Fair Value on a $ 29,768 $ 2,251,818 $ 11,826 $ 2,293,412 Liabilities: Derivatives 1 $ — $ 215 $ 9,478 $ 9,693 Total Liabilities Measured at Fair Value on a $ — $ 215 $ 9,478 $ 9,693 1 The fair value of each class of derivatives is shown in Note 17 Derivative Financial Instruments .
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis	For 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: (dollars in thousands) Mortgage 1 Net Derivative Assets and Liabilities 2 Year Ended December 31, 2018 Balance as of January 1, 2018 $ 1,454 $ 894 Realized and Unrealized Net Gains (Losses): Included in Net Income (164 ) 3,534 Transfers to Loans Held for Sale — (3,451 ) Variation Margin Payments — 3,439 Balance as of December 31, 2018 $ 1,290 $ 4,416 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 4,416 Year Ended December 31, 2017 Balance as of January 1, 2017 $ 1,655 $ 1,053 Realized and Unrealized Net Gains (Losses): Included in Net Income (201 ) 5,648 Transfers to Loans Held for Sale — (5,921 ) Variation Margin Payments $ — $ 114 Balance as of December 31, 2017 $ 1,454 $ 894 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 894 1 Realized and unrealized gains and losses related to mortgage servicing rights are reported as a component of mortgage banking income in the Company’s consolidated statements of income. 2 Realized and unrealized gains and losses related to interest rate lock commitments are reported as a component of mortgage banking income in the Company’s consolidated statements of income. Realized and unrealized gains and losses related to interest rate swap agreements are reported as a component of other noninterest income in the Company’s consolidated statements of income.
Summary of the significant unobservable inputs	For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of December 31, 2018 and 2017 , the significant unobservable inputs used in the fair value measurements were as follows: Significant Unobservable Inputs (weighted-average) Fair Value December 31, December 31, (dollars in thousands) Valuation Technique Description 2018 2017 2018 2017 Mortgage Servicing Rights Discounted Cash Flow Constant Prepayment Rate 1 7.01 % 8.50 % $ 30,508 $ 28,170 Discount Rate 2 9.59 % 8.87 % Net Derivative Assets and Liabilities: Interest Rate Lock Commitments Pricing Model Closing Ratio 89.00 % 93.25 % $ 871 $ 789 Interest Rate Swap Agreements Discounted Cash Flow Credit Factor 0.06 % 0.10 % $ 3,545 $ 105 1 Represents annualized loan prepayment rate assumption. 2 Derived from multiple interest rate scenarios that incorporate a spread to a market yield curve and market volatilities.
Assets and liabilities measured at fair value on a nonrecurring basis	For the years ended December 31, 2018 and 2017 , there were no material adjustments to fair value for the Company’s assets and liabilities measured at fair value on a nonrecurring basis in accordance with GAAP.
Schedule of difference between the aggregate fair value and the aggregate unpaid principal balance of the Company's residential mortgage loans held for sale	The following table reflects the difference between the aggregate fair value and the aggregate unpaid principal balance of the Company’s residential mortgage loans held for sale as of December 31, 2018 and 2017 . (dollars in thousands) Aggregate Aggregate Aggregate Fair Value December 31, 2018 Loans Held for Sale $ 10,987 $ 10,656 $ 331 December 31, 2017 Loans Held for Sale $ 19,231 $ 18,854 $ 377
Schedule of carrying amount, fair value, and fair value hierarchy of financial instruments	The following presents the carrying amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments not recorded at fair value on a recurring basis as of December 31, 2018 and 2017 . This table excludes financial instruments for which the carrying amount approximates fair value. For short-term financial assets such as cash and cash equivalents, the carrying amount is a reasonable estimate of fair value due to the relatively short time between the origination of the instrument and its expected realization. For non-marketable equity securities such as Federal Home Loan Bank and Federal Reserve Bank stock, the carrying amount is a reasonable estimate of fair value as these securities can only be redeemed or sold at their par value and only to the respective issuing government supported institution or to another member institution. For financial liabilities such as noninterest-bearing demand, interest-bearing demand, and savings deposits, the carrying amount is a reasonable estimate of fair value due to these products having no stated maturity. Fair Value Measurements (dollars in thousands) Carrying Amount Fair Value Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Significant December 31, 2018 Financial Instruments – Assets Investment Securities Held-to-Maturity $ 3,482,092 $ 3,413,994 $ 352,216 $ 3,061,778 $ — Loans 1 10,084,527 10,008,417 — — 10,008,417 Financial Instruments – Liabilities Time Deposits 1,745,522 1,734,447 — 1,734,447 — Securities Sold Under Agreements to Repurchase 504,296 504,288 — 504,288 — Other Debt 2 125,000 124,559 — 124,559 — December 31, 2017 Financial Instruments – Assets Investment Securities Held-to-Maturity $ 3,928,170 $ 3,894,121 $ 373,640 $ 3,520,481 $ — Loans 1 9,436,506 9,519,369 — — 9,519,369 Financial Instruments – Liabilities Time Deposits 1,688,092 1,679,684 — 1,679,684 — Securities Sold Under Agreements to Repurchase 505,293 505,278 — 505,278 — Other Debt 2 250,000 248,520 — 248,520 — 1 Carrying amount is net of unearned income and the Allowance. In accordance with the prospective adoption of ASU No. 2016-01, the fair value of loans as of December 31, 2018 was measured using an exit price notion. The fair value of loans as of December 31, 2017 was measured using an entry price notion. 2 Excludes capitalized lease obligations.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue Recognition [Abstract]
Disaggregation of Revenue	The following presents noninterest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the years ended December 31, 2018 , 2017 , and 2016 . Year Ended December 31, (dollars in thousands) 2018 2017 2016 Noninterest Income In-scope of Topic 606: Trust and Asset Management $ 43,877 $ 45,430 $ 46,203 Service Charges on Deposit Accounts 13,165 15,191 15,498 Fees, Exchange, and Other Service Charges 46,350 44,560 44,021 Annuity and Insurance 5,615 6,444 6,473 Other 9,652 8,966 8,795 Noninterest Income (in-scope of Topic 606) 118,659 120,591 120,990 Noninterest Income (out-of-scope of Topic 606) 50,264 64,826 76,353 Total Noninterest Income $ 168,923 $ 185,417 $ 197,343

Bank of Hawaii Corporation Fi_2

Bank of Hawaii Corporation Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Schedule of condensed statements of income	Condensed Statements of Comprehensive Income Year Ended December 31, (dollars in thousands) 2018 2017 2016 Income Dividends from Bank of Hawaii $ 185,000 $ 130,000 $ 120,000 Investment Securities Gains (Losses), Net (819 ) 12,027 (340 ) Other Income 198 204 279 Total Income 184,379 142,231 119,939 Noninterest Expense Intercompany Salaries and Services 734 720 705 Other Expenses 1,701 1,401 1,392 Total Noninterest Expense 2,435 2,121 2,097 Income Before Income Tax Benefit and Equity in Undistributed Income of Subsidiaries 181,944 140,110 117,842 Income Tax Benefit (Expense) 2,229 (3,557 ) 2,137 Equity in Undistributed Income of Subsidiaries 35,429 48,119 61,482 Net Income $ 219,602 $ 184,672 $ 181,461 Comprehensive Income $ 210,751 $ 183,863 $ 171,112
Schedule of condensed statements of condition	Condensed Statements of Condition (dollars in thousands) December 31, 2018 December 31, 2017 Assets Cash with Bank of Hawaii $ 52,731 $ 49,669 Investment Securities Held-to-Maturity 4,999 4,986 Goodwill 14,129 14,129 Income Taxes Receivable and Deferred Tax Assets 1,520 2,567 Other Assets 8,468 8,233 Equity in Net Assets of Subsidiaries 1,195,132 1,161,037 Total Assets $ 1,276,979 $ 1,240,621 Liabilities Income Taxes Payable $ 60 $ 517 Other Liabilities 8,719 8,236 Total Liabilities 8,779 8,753 Shareholders' Equity 1,268,200 1,231,868 Total Liabilities and Shareholders' Equity $ 1,276,979 $ 1,240,621
Schedule of condensed statements of cash flows	Condensed Statements of Cash Flows Year Ended December 31, (dollars in thousands) 2018 2017 2016 Operating Activities Net Income $ 219,602 $ 184,672 $ 181,461 Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: Share-Based Compensation 630 573 558 Net (Gains) Losses on Sales of Investment Securities 819 (12,027 ) 340 Equity in Undistributed Income of Subsidiaries (35,429 ) (48,119 ) (61,482 ) Net Change in Other Assets and Other Liabilities 870 (6,477 ) 1,508 Net Cash Provided by Operating Activities 186,492 118,622 122,385 Investing Activities Capital Distribution from BOHC Investment Fund LLC — 613 — Capital Contributions to the Bank — (12,467 ) — Proceeds from (Expenses related to) Sales of Investment Securities (819 ) 12,027 (340 ) Net Cash Provided by (Used in) Investing Activities (819 ) 173 (340 ) Financing Activities Proceeds from Issuance of Common Stock 7,873 13,101 9,079 Repurchase of Common Stock (91,988 ) (47,076 ) (61,807 ) Cash Dividends Paid (98,496 ) (87,066 ) (81,157 ) Net Cash Used in Financing Activities (182,611 ) (121,041 ) (133,885 ) Net Change in Cash and Cash Equivalents 3,062 (2,246 ) (11,840 ) Cash and Cash Equivalents at Beginning of Period 49,669 51,915 63,755 Cash and Cash Equivalents at End of Period $ 52,731 $ 49,669 $ 51,915

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (VIEs, Receivables and loans, Cash Equivalents) (Details 1) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)classsegmentcomponent	Dec. 31, 2017USD ($)
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	$ 85.9	$ 87.6
Loans and Leases
Number of portfolio segments of loans and leases (commercial and consumer) | segment	2
Number of classes of loans and leases determined by management | class	7
Loans modified in a troubled debt restructuring
Period during which non-accrual loan that has been modified in a troubled debt restructuring remains on non-accrual status (in months)	6 months
Number of components of company's reserve for credit losses | component	2
Cash and Cash Equivalents
Maximum original maturity period of cash and cash equivalents (in days)	90 days
Low-income housing partnerships
Variable Interest Entity [Line Items]
Period over which tax credits or benefits are generally recognized (in years)	10 years
Unfunded commitments to fund low-income housing partnerships	$ 15.2	$ 17.5
Solar energy partnerships
Variable Interest Entity [Line Items]
Period over which tax credits or benefits are generally recognized (in years)	6 years
Commercial
Non-Performing Loans and Leases
Minimum maturity period to be considered to place loans and leases on non-accrual status (in days)	90 days
Residential mortgage and home equity loan
Non-Performing Loans and Leases
Minimum maturity period to be considered to place loans and leases on non-accrual status (in days)	120 days
Home Equity
Non-Performing Loans and Leases
Minimum maturity period to be considered for loans and leases to be charged off (in days)	120 days
Home Equity | Maximum [Member]
Non-Performing Loans and Leases
Combined loan-to-value ratio, considered in determining whether the entire outstanding balance on the loan is to be charged-off or not (as a percent)	60.00%
Automobile and Other consumer
Non-Performing Loans and Leases
Minimum maturity period to be considered for loans and leases to be charged off (in days)	120 days
Commercial and Industrial
Non-Performing Loans and Leases
Minimum maturity period to be considered for loans and leases to be charged off (in days)	120 days

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Property and equipment and other) (Details 2) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)plan	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Pension and Postretirement Benefit Plans
Number of company's pension plans | plan			2
Minimum percentage of net acturial gain (loss) will be amortized in net periodic benefit cost			10.00%
Income Taxes
Minimum percentage of likelihood of tax position being realized upon ultimate settlement according to management's judgment			50.00%
Tax Cuts and Jobs Act of 2017 additional tax expense	$ (0.3)	$ (0.1)		$ 3.6
Low income housing investment partnerships basis adjustments, provision income tax expense		$ 2
Advertising Costs
Advertising costs			$ 6	$ 6	$ 6
Building | Maximum [Member]
Premises and Equipment
Estimated useful lives (in years)			30 years
Equipment | Maximum [Member]
Premises and Equipment
Estimated useful lives (in years)			10 years

Summary of Significant Accoun_5

Summary of Significant Accounting Policies Accounting Standards Updates (Details 3) - USD ($)	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Retained Earnings			$ 1,641,314,000	$ 1,512,218,000
Accounting Standards Update 2018-02
Reclassification from AOCI	$ 7,500,000
Retained Earnings	7,500,000
Income Tax Effects Allocated to Equity	$ 0
Accounting Standards Update 2016-02
Operating Lease, Right-of-Use Asset		$ 106,500,000
Operating Lease, Liability		$ 113,400,000

Restrictions on Cash and Cash_3

Restrictions on Cash and Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents [Abstract]
Required Minimum Average Cash Reserve Maintained with Federal Reserve Bank	$ 72,300	$ 73,200
Cash and Cash Equivalents, at Carrying Value [Abstract]
Interest-Bearing Deposits in Other Banks	3,028	3,421
Federal Funds Sold	198,860	181,413
Cash and Due From Banks	324,081	263,017
Total Cash and Cash Equivalents	$ 525,969	$ 447,851	$ 879,607	$ 755,721

Investment Securities (Amort co

Investment Securities (Amort cost, unrealized gains and losses, and fair value) (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity: Amortized Cost	$ 3,482,092	$ 3,928,170	$ 3,832,997
Held-to-Maturity: Gross Unrealized Gains	11,959	20,949	34,274
Held-to-Maturity: Gross Unrealized Losses	(80,057)	(54,998)	(39,744)
Held-to-Maturity: Fair Value	3,413,994	3,894,121	3,827,527
Due in One Year or Less	164,868
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value	164,518
Available-for-Sale:
Available-for-Sale: Amortized Cost	2,022,158	2,236,144	2,183,943
Available-for-Sale: Gross Unrealized Gains	9,225	15,695	19,539
Available-for-Sale: Gross Unrealized Losses	(23,441)	(18,860)	(17,441)
Available-for-Sale	2,007,942	2,232,979	2,186,041
Debt Securities Issued by the U.S. Treasury and Government Agencies
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity: Amortized Cost	353,122	375,074	530,149
Held-to-Maturity: Gross Unrealized Gains	186	18	1,562
Held-to-Maturity: Gross Unrealized Losses	(1,093)	(1,451)	(771)
Held-to-Maturity: Fair Value	352,215	373,641	530,940
Available-for-Sale:
Available-for-Sale: Amortized Cost	394,485	424,912	407,478
Available-for-Sale: Gross Unrealized Gains	493	2,053	2,531
Available-for-Sale: Gross Unrealized Losses	(2,577)	(1,035)	(1,294)
Available-for-Sale	392,401	425,930	408,715
Debt Securities Issued by States and Political Subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity: Amortized Cost	234,602	238,504	242,295
Held-to-Maturity: Gross Unrealized Gains	6,150	9,125	9,991
Held-to-Maturity: Gross Unrealized Losses	0	0	0
Held-to-Maturity: Fair Value	240,752	247,629	252,286
Available-for-Sale:
Available-for-Sale: Amortized Cost	559,800	618,167	662,231
Available-for-Sale: Gross Unrealized Gains	5,227	9,894	11,455
Available-for-Sale: Gross Unrealized Losses	(1,031)	(1,042)	(1,887)
Available-for-Sale	563,996	627,019	671,799
US Government-sponsored Enterprises Debt Securities [Member]
Available-for-Sale:
Available-for-Sale: Amortized Cost	56
Available-for-Sale: Gross Unrealized Gains	0
Available-for-Sale: Gross Unrealized Losses	0
Available-for-Sale	56
Debt Securities Issued by Corporations
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity: Amortized Cost	97,266	119,635	135,620
Held-to-Maturity: Gross Unrealized Gains	0	123	416
Held-to-Maturity: Gross Unrealized Losses	(1,755)	(1,591)	(1,528)
Held-to-Maturity: Fair Value	95,511	118,167	134,508
Available-for-Sale:
Available-for-Sale: Amortized Cost	224,997	268,003	273,044
Available-for-Sale: Gross Unrealized Gains	0	199	5
Available-for-Sale: Gross Unrealized Losses	(1,857)	(2,091)	(3,870)
Available-for-Sale	223,140	266,111	269,179
Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity: Amortized Cost	2,797,102	3,194,957	2,924,933
Held-to-Maturity: Gross Unrealized Gains	5,623	11,683	22,305
Held-to-Maturity: Gross Unrealized Losses	(77,209)	(51,956)	(37,445)
Held-to-Maturity: Fair Value	2,725,516	3,154,684	2,909,793
Available-for-Sale:
Available-for-Sale: Amortized Cost	842,820	925,062	841,190
Available-for-Sale: Gross Unrealized Gains	3,505	3,549	5,548
Available-for-Sale: Gross Unrealized Losses	(17,976)	(14,692)	(10,390)
Available-for-Sale	828,349	913,919	836,348
Residential - Government Agencies
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity: Amortized Cost	1,861,874	2,229,985	1,940,076
Held-to-Maturity: Gross Unrealized Gains	3,886	9,975	20,567
Held-to-Maturity: Gross Unrealized Losses	(51,773)	(37,047)	(23,861)
Held-to-Maturity: Fair Value	1,813,987	2,202,913	1,936,782
Available-for-Sale:
Available-for-Sale: Amortized Cost	189,645	233,268	240,412
Available-for-Sale: Gross Unrealized Gains	1,726	3,129	4,577
Available-for-Sale: Gross Unrealized Losses	(929)	(1,037)	(1,145)
Available-for-Sale	190,442	235,360	243,844
Residential - U.S. Government Sponsored Enterprises
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity: Amortized Cost	758,835	763,312	752,768
Held-to-Maturity: Gross Unrealized Gains	1,590	911	798
Held-to-Maturity: Gross Unrealized Losses	(20,259)	(11,255)	(10,919)
Held-to-Maturity: Fair Value	740,166	752,968	742,647
Available-for-Sale:
Available-for-Sale: Amortized Cost	589,311	619,795	511,234
Available-for-Sale: Gross Unrealized Gains	1,779	420	971
Available-for-Sale: Gross Unrealized Losses	(12,563)	(10,403)	(5,218)
Available-for-Sale	578,527	609,812	506,987
Commercial - Government Agencies
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity: Amortized Cost	176,393	201,660	232,089
Held-to-Maturity: Gross Unrealized Gains	147	797	940
Held-to-Maturity: Gross Unrealized Losses	(5,177)	(3,654)	(2,665)
Held-to-Maturity: Fair Value	171,363	198,803	230,364
Available-for-Sale:
Available-for-Sale: Amortized Cost	63,864	71,999	89,544
Available-for-Sale: Gross Unrealized Gains	0	0	0
Available-for-Sale: Gross Unrealized Losses	(4,484)	(3,252)	(4,027)
Available-for-Sale	$ 59,380	$ 68,747	$ 85,517

Investment Securities (Contract

Investment Securities (Contractual Maturities and Narrative) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Rolling Maturity [Abstract]
Due in One Year or Less	$ 57,119
Due After One Year Through Five Years	613,577
Due After Five Years Through Ten Years	92,306
Due After Ten Years	22,830
Available-for-Sale, Total	785,832
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Due in One Year or Less	57,094
Due After One Year Through Five Years	613,408
Due After Five Years Through Ten Years	94,126
Due After Ten Years	23,536
Fair Value, Total	788,164
Available-for-Sale: Amortized Cost	2,022,158	$ 2,236,144	$ 2,183,943
Available-for-Sale	2,007,942	2,232,979	2,186,041
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturity [Abstract]
Due in One Year or Less	164,868
Due After One Year Through Five Years	311,016
Due After Five Years Through Ten Years	201,389
Due After Ten Years	7,717
Amortized Cost, Total	684,990
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value	164,518
Due After One Year Through Five Years	312,837
Due After Five Years Through Ten Years	203,010
Due After Ten Years	8,113
Fair Value, Total	688,478
Held-to-Maturity: Amortized Cost	3,482,092
Held-to-Maturity: Fair Value	3,413,994	3,894,121	3,827,527
Carrying value of investment securities which were pledged to secure deposits of gov't entities and repos	$ 2,300,000	2,400,000	2,400,000
Number of days non-accrual loans and leases are not past due	30 days
Mortgage-Backed Securities
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost	$ 842,820
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed-Securities: Fair Value	828,349
Available-for-Sale: Amortized Cost	842,820	925,062	841,190
Available-for-Sale	828,349	913,919	836,348
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed-Securities: Amortized Cost	2,797,102
Held-to-Maturity: Mortgage-Backed-Securities: Fair Value	2,725,516
Held-to-Maturity: Fair Value	2,725,516	3,154,684	2,909,793
US Government Agencies Debt Securities
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost	393,506
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed-Securities: Fair Value	391,429
Residential - Government Agencies
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost	189,645
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed-Securities: Fair Value	190,442
Available-for-Sale: Amortized Cost	189,645	233,268	240,412
Available-for-Sale	190,442	235,360	243,844
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed-Securities: Amortized Cost	1,861,874
Held-to-Maturity: Mortgage-Backed-Securities: Fair Value	1,813,987
Held-to-Maturity: Fair Value	1,813,987	2,202,913	1,936,782
Residential - U.S. Government Sponsored Enterprises
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost	589,311
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed-Securities: Fair Value	578,527
Available-for-Sale: Amortized Cost	589,311	619,795	511,234
Available-for-Sale	578,527	609,812	506,987
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed-Securities: Amortized Cost	758,835
Held-to-Maturity: Mortgage-Backed-Securities: Fair Value	740,166
Held-to-Maturity: Fair Value	740,166	752,968	742,647
Commercial - Government Agencies
Available-for-Sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost	63,864
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed-Securities: Fair Value	59,380
Available-for-Sale: Amortized Cost	63,864	71,999	89,544
Available-for-Sale	59,380	68,747	85,517
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed-Securities: Amortized Cost	176,393
Held-to-Maturity: Mortgage-Backed-Securities: Fair Value	171,363
Held-to-Maturity: Fair Value	$ 171,363	$ 198,803	$ 230,364

Investment Securities (Gains an

Investment Securities (Gains and Losses on Sales) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Carrying value of investment securities which were pledged to secure deposits of gov't entities and repos	$ 2,300,000	$ 2,400,000	$ 2,400,000
Gain on Sale of Investments	0	12,467	11,180
Loss on Sale of Investments	3,938	2,037	977
Gain (Loss) on Sale of Investments	$ (3,938)	$ 10,430	$ 10,203

Investment Securities (Unrealiz

Investment Securities (Unrealized Position - Less than 12 Mos., 12 Mos. or Longer) (Details 4) $ in Thousands	Dec. 31, 2018USD ($)security	Dec. 31, 2017USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	$ 261,265	$ 729,547
Less Than 12 Months, Gross Unrealized Losses	(1,264)	(7,370)
12 Months or Longer, Fair Value	1,045,677	555,984
12 Months or Longer, Gross Unrealized Losses	(22,177)	(11,490)
Total Fair Value	1,306,942	1,285,531
Total Gross Unrealized Losses	(23,441)	(18,860)
Held-to-Maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	131,631	1,604,272
Less than 12 Months, Gross Unrealized Losses	(343)	(16,015)
12 Months or Longer, Fair Value	2,484,212	1,274,325
12 Months or Longer, Gross Unrealized Losses	(79,714)	(38,983)
Total, Fair Value	2,615,843	2,878,597
Total Gross Unrealized Losses	$ (80,057)	(54,998)
Number of Investment Securities in Unrealized Loss Position | security	464
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	$ 157,058	103,842
Less Than 12 Months, Gross Unrealized Losses	(964)	(599)
12 Months or Longer, Fair Value	173,763	132,071
12 Months or Longer, Gross Unrealized Losses	(1,613)	(436)
Total Fair Value	330,821	235,913
Total Gross Unrealized Losses	(2,577)	(1,035)
Held-to-Maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	99,440	254,283
Less than 12 Months, Gross Unrealized Losses	(237)	(532)
12 Months or Longer, Fair Value	134,239	89,391
12 Months or Longer, Gross Unrealized Losses	(856)	(919)
Total, Fair Value	233,679	343,674
Total Gross Unrealized Losses	(1,093)	(1,451)
Debt Securities Issued by States and Political Subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	38,138	172,343
Less Than 12 Months, Gross Unrealized Losses	(59)	(1,032)
12 Months or Longer, Fair Value	156,772	734
12 Months or Longer, Gross Unrealized Losses	(972)	(10)
Total Fair Value	194,910	173,077
Total Gross Unrealized Losses	(1,031)	(1,042)
Debt Securities Issued by Corporations
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	59,770	12,985
Less Than 12 Months, Gross Unrealized Losses	(231)	(15)
12 Months or Longer, Fair Value	163,371	192,927
12 Months or Longer, Gross Unrealized Losses	(1,626)	(2,076)
Total Fair Value	223,141	205,912
Total Gross Unrealized Losses	(1,857)	(2,091)
Held-to-Maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	0	25,490
Less than 12 Months, Gross Unrealized Losses	0	(110)
12 Months or Longer, Fair Value	95,511	58,869
12 Months or Longer, Gross Unrealized Losses	(1,755)	(1,481)
Total, Fair Value	95,511	84,359
Total Gross Unrealized Losses	(1,755)	(1,591)
Mortgage-Backed Securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	6,299	440,377
Less Than 12 Months, Gross Unrealized Losses	(10)	(5,724)
12 Months or Longer, Fair Value	551,771	230,252
12 Months or Longer, Gross Unrealized Losses	(17,966)	(8,968)
Total Fair Value	558,070	670,629
Total Gross Unrealized Losses	(17,976)	(14,692)
Held-to-Maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	32,191	1,324,499
Less than 12 Months, Gross Unrealized Losses	(106)	(15,373)
12 Months or Longer, Fair Value	2,254,462	1,126,065
12 Months or Longer, Gross Unrealized Losses	(77,103)	(36,583)
Total, Fair Value	2,286,653	2,450,564
Total Gross Unrealized Losses	(77,209)	(51,956)
Residential - Government Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	6,299	11,035
Less Than 12 Months, Gross Unrealized Losses	(10)	(4)
12 Months or Longer, Fair Value	19,011	10,618
12 Months or Longer, Gross Unrealized Losses	(919)	(1,033)
Total Fair Value	25,310	21,653
Total Gross Unrealized Losses	(929)	(1,037)
Held-to-Maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	12,974	1,030,472
Less than 12 Months, Gross Unrealized Losses	(45)	(12,262)
12 Months or Longer, Fair Value	1,491,747	704,545
12 Months or Longer, Gross Unrealized Losses	(51,728)	(24,785)
Total, Fair Value	1,504,721	1,735,017
Total Gross Unrealized Losses	(51,773)	(37,047)
Residential - U.S. Government Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	0	429,342
Less Than 12 Months, Gross Unrealized Losses	0	(5,720)
12 Months or Longer, Fair Value	473,380	150,887
12 Months or Longer, Gross Unrealized Losses	(12,563)	(4,683)
Total Fair Value	473,380	580,229
Total Gross Unrealized Losses	(12,563)	(10,403)
Held-to-Maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	0	293,530
Less than 12 Months, Gross Unrealized Losses	0	(3,106)
12 Months or Longer, Fair Value	617,000	339,232
12 Months or Longer, Gross Unrealized Losses	(20,259)	(8,149)
Total, Fair Value	617,000	632,762
Total Gross Unrealized Losses	(20,259)	(11,255)
Commercial - Government Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	0	0
Less Than 12 Months, Gross Unrealized Losses	0	0
12 Months or Longer, Fair Value	59,380	68,747
12 Months or Longer, Gross Unrealized Losses	(4,484)	(3,252)
Total Fair Value	59,380	68,747
Total Gross Unrealized Losses	(4,484)	(3,252)
Held-to-Maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	19,217	497
Less than 12 Months, Gross Unrealized Losses	(61)	(5)
12 Months or Longer, Fair Value	145,715	82,288
12 Months or Longer, Gross Unrealized Losses	(5,116)	(3,649)
Total, Fair Value	164,932	82,785
Total Gross Unrealized Losses	$ (5,177)	$ (3,654)

Investment Securities (Interest

Investment Securities (Interest Income - Taxable/Non-Taxable Invest. Sec.) (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Interest Income from Investment Securities, Taxable	$ 115,947	$ 108,787	$ 100,541
Interest Income from Investment Securities, Non-Taxable	18,515	19,725	20,438
Total Interest Income from Investment Securities	$ 134,462	$ 128,512	$ 120,979

Investment Securities (Municipa

Investment Securities (Municipal Bond Narrative) (Details 6) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Debt Securities, Available-for-sale [Line Items]
Municipal Debt Securities Issued by One Single State or Political Subdivision as Percentage of Total Fair Value of Entire Municipal Debt Securities Threshold	10.00%
HAWAII | Debt Securities Issued by States and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities Issued by State and Political Subdivision, State of Hawaii	$ 451.1
Municipal Debt Securities | Geographic Concentration Risk | HAWAII | Debt Securities Issued by States and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Concentration Risk, Percentage	56.00%
Hawaiian Municipal Debt Securities | Investment Concentration Risk | HAWAII | General Obligation Bond
Debt Securities, Available-for-sale [Line Items]
Concentration Risk, Percentage	79.00%
Moody's, Aa2 or Better Rating [Member] | Hawaiian Municipal Debt Securities | Investment Concentration Risk | HAWAII | Debt Securities Issued by States and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Concentration Risk, Percentage	96.00%

Investment Securities (FHLB and

Investment Securities (FHLB and FRB Stocks) (Details 7) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Federal Home Loan Bank Stock	$ 15,000	$ 20,000
Federal Reserve Bank Stock	20,858	20,645
Total	$ 35,858	$ 40,645

Investment Securities (Visa Cla

Investment Securities (Visa Class B Restricted Shares Narrative) (Details 8) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Net Investment Income [Line Items]
Tax on Sale of Investment Securities | $	$ (1)	$ 4.1	$ 4
Visa Class B Restricted Securities
Net Investment Income [Line Items]
Conversion ratio to Class A shares	1.6298
Equity securities remaining, shares | shares	83,014
Visa Class A Unrestricted Securities
Net Investment Income [Line Items]
Equity securities remaining, shares | shares	135,296
Visa Conversion Rate Swap Agreement [Member]
Net Investment Income [Line Items]
Liability Derivatives | $	$ 1

Loans and Leases and the Allo_3

Loans and Leases and the Allowance for Loan and Lease Losses (Loans and Leases Portolio & Narrative) (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loan and lease portfolio
Loans and Leases	$ 10,448,774	$ 9,796,947	$ 8,949,785
Unearned income on loans and leases	15,100	20,200
Commercial loans and residential mortgage loans pledged to secure an undrawn FRB line of credit	1,000,000	1,000,000
Residential mortgage loans pledged under a blanket pledge arrangement to secure FHLB advance	2,900,000	2,900,000
Net gains related to sales of residential mortgage loans	1,500	4,900	11,800
Commercial
Loan and lease portfolio
Loans and Leases	3,979,792	3,766,498	3,617,692
Commercial | Commercial and Industrial
Loan and lease portfolio
Loans and Leases	1,331,149	1,279,347
Commercial | Commercial Mortgage
Loan and lease portfolio
Loans and Leases	2,302,356	2,103,967
Commercial | Construction
Loan and lease portfolio
Loans and Leases	170,061	202,253
Commercial | Lease Financing
Loan and lease portfolio
Loans and Leases	176,226	180,931
Consumer
Loan and lease portfolio
Loans and Leases	6,468,982	6,030,449	$ 5,332,093
Consumer | Residential Mortgage
Loan and lease portfolio
Loans and Leases	3,673,796	3,466,773
Consumer | Home Equity
Loan and lease portfolio
Loans and Leases	1,681,442	1,585,455
Consumer | Automobile
Loan and lease portfolio
Loans and Leases	658,133	528,474
Consumer | Other
Loan and lease portfolio
Loans and Leases	$ 455,611	$ 449,747

Loans and Leases and the Allo_4

Loans and Leases and the Allowance for Loan and Lease Losses (Allowance for Loan and Lease Losses) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses:
Balance at the Beginning of Period	$ 107,346	$ 104,273	$ 102,880
Loans and Leases Charged-Off	(24,564)	(23,255)	(18,509)
Recoveries on Loans and Leases Previously Charged-Off	10,486	9,428	15,152
Net Loans and Leases Recovered (Charged-Off)	(14,078)	(13,827)	(3,357)
Provision for Credit Losses	13,425	16,900	4,750
Balance at End of Period	106,693	107,346	104,273
Allowance for Loan and Lease Losses:
Individually Evaluated for Impairment				$ 3,976	$ 3,916	$ 3,555
Collectively Evaluated for Impairment				102,717	103,430	100,718
Total	107,346	104,273	102,880	106,693	107,346	104,273
Recorded Investment in Loans and Leases:
Individually Evaluated for Impairment				54,625	61,218	60,698
Collectively Evaluated for Impairment				10,394,149	9,735,729	8,889,087
Total Loans and Leases				10,448,774	9,796,947	8,949,785
Commercial
Allowance for Loan and Lease Losses:
Balance at the Beginning of Period	65,822	65,680	60,714
Loans and Leases Charged-Off	(1,505)	(1,408)	(865)
Recoveries on Loans and Leases Previously Charged-Off	2,039	1,485	8,137
Net Loans and Leases Recovered (Charged-Off)	534	77	7,272
Provision for Credit Losses	518	65	(2,306)
Balance at End of Period	66,874	65,822	65,680
Allowance for Loan and Lease Losses:
Individually Evaluated for Impairment				222	141	45
Collectively Evaluated for Impairment				66,652	65,681	65,635
Total	65,822	65,680	60,714	66,874	65,822	65,680
Recorded Investment in Loans and Leases:
Individually Evaluated for Impairment				12,298	20,216	21,572
Collectively Evaluated for Impairment				3,967,494	3,746,282	3,596,120
Total Loans and Leases				3,979,792	3,766,498	3,617,692
Consumer
Allowance for Loan and Lease Losses:
Balance at the Beginning of Period	41,524	38,593	42,166
Loans and Leases Charged-Off	(23,059)	(21,847)	(17,644)
Recoveries on Loans and Leases Previously Charged-Off	8,447	7,943	7,015
Net Loans and Leases Recovered (Charged-Off)	(14,612)	(13,904)	(10,629)
Provision for Credit Losses	12,907	16,835	7,056
Balance at End of Period	39,819	41,524	38,593
Allowance for Loan and Lease Losses:
Individually Evaluated for Impairment				3,754	3,775	3,510
Collectively Evaluated for Impairment				36,065	37,749	35,083
Total	$ 41,524	$ 38,593	$ 42,166	39,819	41,524	38,593
Recorded Investment in Loans and Leases:
Individually Evaluated for Impairment				42,327	41,002	39,126
Collectively Evaluated for Impairment				6,426,655	5,989,447	5,292,967
Total Loans and Leases				$ 6,468,982	$ 6,030,449	$ 5,332,093

Loans and Leases and the Allo_5

Loans and Leases and the Allowance for Loan and Lease Losses (Credit Quality Indicators & Narrative) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	$ 10,448,774	$ 9,796,947	$ 8,949,785
Classified
Recorded investment in loans and leases by class and by credit quality indicator
Number of months up to which residential and home equity loans may be considered classified, even if they are current as to principal and interest (in months)	6 months
Residential Mortgage | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent)	60.00%
Home Equity | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent)	60.00%
Commercial
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	$ 3,979,792	3,766,498	3,617,692
Commercial | Pass
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	3,902,369	3,660,931
Commercial | Special Mention
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	48,161	51,173
Commercial | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	29,262	54,394
Commercial | Commercial and Industrial
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	1,331,149	1,279,347
Commercial | Commercial and Industrial | Pass
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	1,302,278	1,234,738
Commercial | Commercial and Industrial | Special Mention
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	17,688	15,394
Commercial | Commercial and Industrial | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	11,183	29,215
Commercial | Commercial Mortgage
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	2,302,356	2,103,967
Commercial | Commercial Mortgage | Pass
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	2,256,128	2,046,745
Commercial | Commercial Mortgage | Special Mention
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	30,468	35,762
Commercial | Commercial Mortgage | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	15,760	21,460
Commercial | Construction
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	170,061	202,253
Commercial | Construction | Pass
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	168,740	198,926
Commercial | Construction | Special Mention
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	0	6
Commercial | Construction | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	1,321	3,321
Commercial | Lease Financing
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	176,226	180,931
Commercial | Lease Financing | Pass
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	175,223	180,522
Commercial | Lease Financing | Special Mention
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	5	11
Commercial | Lease Financing | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	998	398
Consumer
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	6,468,982	6,030,449	$ 5,332,093
Consumer | Pass
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	$ 6,457,985	6,015,043
Consumer | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Number of days past due for loans and leases in classified credit quality indicator	90 days
Total Recorded Investment in Loans and Leases	$ 10,997	15,406
Consumer | Residential Mortgage
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	3,673,796	3,466,773
Consumer | Residential Mortgage | Pass
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	$ 3,668,475	3,457,531
Consumer | Residential Mortgage | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Number of days past due for loans and leases in classified credit quality indicator	90 days
Total Recorded Investment in Loans and Leases	$ 5,321	9,242
Consumer | Home Equity
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	1,681,442	1,585,455
Consumer | Home Equity | Pass
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	$ 1,677,193	1,580,917
Consumer | Home Equity | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Number of days past due for loans and leases in classified credit quality indicator	90 days
Total Recorded Investment in Loans and Leases	$ 4,249	4,538
Consumer | Automobile
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	658,133	528,474
Consumer | Automobile | Pass
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	657,620	527,587
Consumer | Automobile | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	513	887
Consumer | Other
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	455,611	449,747
Consumer | Other | Pass
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	454,697	449,008
Consumer | Other | Classified
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	$ 914	$ 739

Loans and Leases and the Allo_6

Loans and Leases and the Allowance for Loan and Lease Losses (Aging Analysis) (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	$ 11,574	$ 15,080
Total Past Due and Non-Accrual	52,104	61,352
Current	10,396,670	9,735,595
Total Loans and Leases	10,448,774	9,796,947	$ 8,949,785
Non-Accrual Loans and Leases that are Current	$ 4,523	2,896
Number of days non-accrual loans and leases are not past due	30 days
30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	$ 28,141	29,465
60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	5,822	9,660
Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	6,567	7,147
Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	2,582	1,846
Total Past Due and Non-Accrual	6,924	7,274
Current	3,972,868	3,759,224
Total Loans and Leases	3,979,792	3,766,498	3,617,692
Non-Accrual Loans and Leases that are Current	2,555	778
Commercial | 30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	4,214	4,383
Commercial | 60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	118	1,045
Commercial | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	10	0
Commercial | Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	542	448
Total Past Due and Non-Accrual	4,323	5,285
Current	1,326,826	1,274,062
Total Loans and Leases	1,331,149	1,279,347
Non-Accrual Loans and Leases that are Current	515	313
Commercial | Commercial and Industrial | 30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	3,653	4,196
Commercial | Commercial and Industrial | 60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	118	641
Commercial | Commercial and Industrial | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	10	0
Commercial | Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	2,040	1,398
Total Past Due and Non-Accrual	2,601	1,989
Current	2,299,755	2,101,978
Total Loans and Leases	2,302,356	2,103,967
Non-Accrual Loans and Leases that are Current	2,040	465
Commercial | Commercial Mortgage | 30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	561	187
Commercial | Commercial Mortgage | 60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	404
Commercial | Commercial Mortgage | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	0	0
Current	170,061	202,253
Total Loans and Leases	170,061	202,253
Non-Accrual Loans and Leases that are Current	0	0
Commercial | Construction | 30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Construction | 60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Construction | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Lease Financing
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	0	0
Current	176,226	180,931
Total Loans and Leases	176,226	180,931
Non-Accrual Loans and Leases that are Current	0	0
Commercial | Lease Financing | 30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Lease Financing | 60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Lease Financing | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	8,992	13,234
Total Past Due and Non-Accrual	45,180	54,078
Current	6,423,802	5,976,371
Total Loans and Leases	6,468,982	6,030,449	$ 5,332,093
Non-Accrual Loans and Leases that are Current	1,968	2,118
Consumer | 30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	23,927	25,082
Consumer | 60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	5,704	8,615
Consumer | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	6,557	7,147
Consumer | Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	5,321	9,243
Total Past Due and Non-Accrual	13,724	21,769
Current	3,660,072	3,445,004
Total Loans and Leases	3,673,796	3,466,773
Non-Accrual Loans and Leases that are Current	1,203	806
Consumer | Residential Mortgage | 30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	5,319	7,815
Consumer | Residential Mortgage | 60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	638	2,008
Consumer | Residential Mortgage | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,446	2,703
Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	3,671	3,991
Total Past Due and Non-Accrual	11,259	10,883
Current	1,670,183	1,574,572
Total Loans and Leases	1,681,442	1,585,455
Non-Accrual Loans and Leases that are Current	765	1,312
Consumer | Home Equity | 30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	3,323	2,532
Consumer | Home Equity | 60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,581	2,736
Consumer | Home Equity | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,684	1,624
Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	15,125	14,846
Current	643,008	513,628
Total Loans and Leases	658,133	528,474
Non-Accrual Loans and Leases that are Current	0	0
Consumer | Automobile | 30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	12,372	11,728
Consumer | Automobile | 60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,240	2,232
Consumer | Automobile | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	513	886
Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	5,072	6,580
Current	450,539	443,167
Total Loans and Leases	455,611	449,747
Non-Accrual Loans and Leases that are Current	0	0
Consumer | Other | 30 to 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,913	3,007
Consumer | Other | 60 to 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,245	1,639
Consumer | Other | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	$ 914	$ 1,934

Loans and Leases and the Allo_7

Loans and Leases and the Allowance for Loan and Lease Losses (Impaired Loans) (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Impaired Loans Information:
Impaired Loans with No Related Allowance, Recorded Investment	$ 8,620	$ 18,205
Impaired Loans with No Related Allowance, Unpaid Principal Balance	12,120	29,358
Impaired Loans with Related Allowance, Recorded Investment	46,005	43,013
Impaired Loans with Related Allowance, Unpaid Principal Balance	50,130	47,756
Related Allowance for Loan Losses	3,976	3,916
Recorded Investment	54,625	61,218
Unpaid Principal Balance	62,250	77,114
Impaired Loans with No Related Allowance, Average Recorded Investment	12,344	19,525
Impaired Loans with No Related Allowance, Interest Income Recognized	539	744
Impaired Loans with Related Allowance, Average Recorded Investment	43,912	40,893
Impaired Loans with Related Allowance, Interest Income Recognized	2,657	2,063
Average Recorded Investment	56,256	60,418	$ 62,100
Interest Income Recognized	3,196	2,807	$ 2,700
Commercial
Impaired Loans Information:
Impaired Loans with No Related Allowance, Recorded Investment	8,620	18,205
Impaired Loans with No Related Allowance, Unpaid Principal Balance	12,120	29,358
Impaired Loans with Related Allowance, Recorded Investment	3,678	2,011
Impaired Loans with Related Allowance, Unpaid Principal Balance	3,921	2,011
Related Allowance for Loan Losses	222	141
Recorded Investment	12,298	20,216
Unpaid Principal Balance	16,041	31,369
Impaired Loans with No Related Allowance, Average Recorded Investment	12,344	19,525
Impaired Loans with No Related Allowance, Interest Income Recognized	539	744
Impaired Loans with Related Allowance, Average Recorded Investment	2,098	1,399
Impaired Loans with Related Allowance, Interest Income Recognized	125	96
Average Recorded Investment	14,442	20,924
Interest Income Recognized	664	840
Commercial | Commercial and Industrial
Impaired Loans Information:
Impaired Loans with No Related Allowance, Recorded Investment	4,587	8,094
Impaired Loans with No Related Allowance, Unpaid Principal Balance	4,587	15,747
Impaired Loans with Related Allowance, Recorded Investment	1,856	811
Impaired Loans with Related Allowance, Unpaid Principal Balance	2,099	811
Related Allowance for Loan Losses	130	21
Impaired Loans with No Related Allowance, Average Recorded Investment	6,342	8,810
Impaired Loans with No Related Allowance, Interest Income Recognized	310	351
Impaired Loans with Related Allowance, Average Recorded Investment	1,475	709
Impaired Loans with Related Allowance, Interest Income Recognized	100	42
Commercial | Commercial Mortgage
Impaired Loans Information:
Impaired Loans with No Related Allowance, Recorded Investment	2,712	8,696
Impaired Loans with No Related Allowance, Unpaid Principal Balance	6,212	12,196
Impaired Loans with Related Allowance, Recorded Investment	1,822	1,200
Impaired Loans with Related Allowance, Unpaid Principal Balance	1,822	1,200
Impaired Loans with No Related Allowance, Average Recorded Investment	4,642	9,251
Impaired Loans with No Related Allowance, Interest Income Recognized	160	299
Impaired Loans with Related Allowance, Average Recorded Investment	623	690
Impaired Loans with Related Allowance, Interest Income Recognized	25	54
Commercial | Construction
Impaired Loans Information:
Impaired Loans with No Related Allowance, Recorded Investment	1,321	1,415
Impaired Loans with No Related Allowance, Unpaid Principal Balance	1,321	1,415
Impaired Loans with No Related Allowance, Average Recorded Investment	1,360	1,464
Impaired Loans with No Related Allowance, Interest Income Recognized	69	94
Consumer
Impaired Loans Information:
Impaired Loans with Related Allowance, Recorded Investment	42,327	41,002
Impaired Loans with Related Allowance, Unpaid Principal Balance	46,209	45,745
Related Allowance for Loan Losses	3,754	3,775
Recorded Investment	42,327	41,002
Unpaid Principal Balance	46,209	45,745
Impaired Loans with Related Allowance, Average Recorded Investment	41,814	39,494
Impaired Loans with Related Allowance, Interest Income Recognized	2,532	1,967
Average Recorded Investment	41,814	39,494
Interest Income Recognized	2,532	1,967
Consumer | Residential Mortgage
Impaired Loans Information:
Impaired Loans with Related Allowance, Recorded Investment	19,753	21,581
Impaired Loans with Related Allowance, Unpaid Principal Balance	23,635	26,324
Related Allowance for Loan Losses	3,051	3,118
Impaired Loans with Related Allowance, Average Recorded Investment	20,324	22,981
Impaired Loans with Related Allowance, Interest Income Recognized	1,080	845
Consumer | Home Equity
Impaired Loans Information:
Impaired Loans with Related Allowance, Recorded Investment	3,359	1,965
Impaired Loans with Related Allowance, Unpaid Principal Balance	3,359	1,965
Related Allowance for Loan Losses	350	276
Impaired Loans with Related Allowance, Average Recorded Investment	2,676	1,707
Impaired Loans with Related Allowance, Interest Income Recognized	121	82
Consumer | Automobile
Impaired Loans Information:
Impaired Loans with Related Allowance, Recorded Investment	17,117	14,811
Impaired Loans with Related Allowance, Unpaid Principal Balance	17,117	14,811
Related Allowance for Loan Losses	296	305
Impaired Loans with Related Allowance, Average Recorded Investment	16,190	12,235
Impaired Loans with Related Allowance, Interest Income Recognized	1,116	825
Consumer | Other
Impaired Loans Information:
Impaired Loans with Related Allowance, Recorded Investment	2,098	2,645
Impaired Loans with Related Allowance, Unpaid Principal Balance	2,098	2,645
Related Allowance for Loan Losses	57	76
Impaired Loans with Related Allowance, Average Recorded Investment	2,624	2,571
Impaired Loans with Related Allowance, Interest Income Recognized	215	215
Commercial Mortgage
Impaired Loans Information:
Related Allowance for Loan Losses	$ 92	$ 120

Loans and Leases and the Allo_8

Loans and Leases and the Allowance for Loan and Lease Losses (Troubled Debt Restrucuring & Narrative) (Details 6) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)contract	Dec. 31, 2017USD ($)contract
Loans and Leases and the Allowance for Loan and Lease Losses
Loans modified in a TDR	$ 54,000	$ 60,100
Available commitments under Revolving Credit Lines, Modified as TDR	$ 200	$ 1,500
Loans Modified as a TDR
Number of Contracts | contract	532	618
Recorded Investment (as of period end)	$ 14,322	$ 20,625
Increase in Allowance (as of period end)	$ 600	$ 330
Commercial
Loans Modified as a TDR
Number of Contracts | contract	13	17
Recorded Investment (as of period end)	$ 3,099	$ 9,635
Increase in Allowance (as of period end)	$ 170	$ 104
Commercial | Commercial and Industrial
Loans Modified as a TDR
Number of Contracts | contract	12	13
Recorded Investment (as of period end)	$ 1,449	$ 7,299
Increase in Allowance (as of period end)	$ 96	$ 11
Commercial | Commercial Mortgage
Loans Modified as a TDR
Number of Contracts | contract	1	4
Recorded Investment (as of period end)	$ 1,650	$ 2,336
Increase in Allowance (as of period end)	$ 74	$ 93
Consumer
Loans Modified as a TDR
Number of Contracts | contract	519	601
Recorded Investment (as of period end)	$ 11,223	$ 10,990
Increase in Allowance (as of period end)	$ 430	$ 226
Consumer | Residential Mortgage
Loans Modified as a TDR
Number of Contracts | contract	6	2
Recorded Investment (as of period end)	$ 1,458	$ 368
Increase in Allowance (as of period end)	$ 200	$ 1
Consumer | Home Equity
Loans Modified as a TDR
Number of Contracts | contract	9	4
Recorded Investment (as of period end)	$ 1,438	$ 604
Increase in Allowance (as of period end)	$ 77	$ 13
Consumer | Automobile
Loans Modified as a TDR
Number of Contracts | contract	366	424
Recorded Investment (as of period end)	$ 7,400	$ 8,623
Increase in Allowance (as of period end)	$ 128	$ 177
Consumer | Other
Loans Modified as a TDR
Number of Contracts | contract	138	171
Recorded Investment (as of period end)	$ 927	$ 1,395
Increase in Allowance (as of period end)	$ 25	$ 35
Maximum [Member] | Residential Mortgage
Loans and Leases and the Allowance for Loan and Lease Losses
Period of time loan being fully amortized	40 years
Maximum [Member] | Land Loans
Loans and Leases and the Allowance for Loan and Lease Losses
Period of time loan being fully amortized	360 months
Extending balloon payments	5 years

Loans and Leases and the Allo_9

Loans and Leases and the Allowance for Loan and Lease Losses (Troubled Debt Restructuring's that Defaulted During the Period) (Details 7) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)contract	Dec. 31, 2017USD ($)contract
Information related to loans modified as a TDR
Number of Contracts | contract	73	68
Recorded Investment (as of period end) | $	$ 877	$ 1,443
Commercial
Information related to loans modified as a TDR
Number of Contracts | contract	1	2
Recorded Investment (as of period end) | $	$ 3	$ 389
Commercial | Commercial and Industrial
Information related to loans modified as a TDR
Number of Contracts | contract	1	1
Recorded Investment (as of period end) | $	$ 3	$ 48
Commercial | Commercial Mortgage
Information related to loans modified as a TDR
Number of Contracts | contract	0	1
Recorded Investment (as of period end) | $	$ 0	$ 341
Consumer
Information related to loans modified as a TDR
Number of Contracts | contract	72	66
Recorded Investment (as of period end) | $	$ 874	$ 1,054
Consumer | Residential Mortgage
Information related to loans modified as a TDR
Number of Contracts | contract	0	1
Recorded Investment (as of period end) | $	$ 0	$ 94
Consumer | Home Equity
Information related to loans modified as a TDR
Number of Contracts | contract	0	1
Recorded Investment (as of period end) | $	$ 0	$ 237
Consumer | Automobile
Information related to loans modified as a TDR
Number of Contracts | contract	38	28
Recorded Investment (as of period end) | $	$ 680	$ 515
Consumer | Other
Information related to loans modified as a TDR
Number of Contracts | contract	34	36
Recorded Investment (as of period end) | $	$ 194	$ 208
Minimum [Member]
Information related to loans modified as a TDR
Default period past due following modification of loans in TDR (in days)	60 days

Loans and Leases and the All_10

Loans and Leases and the Allowance for Loan and Lease Losses (Foreclosure Proceedings Narrative) (Details 8) $ in Millions	Dec. 31, 2018USD ($)
Loans and Leases and Allowance for Loan and Lease Losses [Abstract]
Mortgage Loans in Process of Foreclosure, Amount	$ 4

Mortgage Servicing Rights (Narr

Mortgage Servicing Rights (Narrative) (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Transfers and Servicing of Financial Assets [Abstract]
Residential Mortgage Loans Serviced for Third Parties	$ 2,900	$ 2,900	$ 2,700
Servicing income, including late and ancillary fees	$ 7.3	$ 7.1	$ 6.9

Mortgage Servicing Rights (Fair

Mortgage Servicing Rights (Fair value method rollforward) (Details 2) - Mortgage Servicing Rights - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in fair value of the mortgage servicing rights accounted for under the fair value measurement method
Balance at Beginning of Year	$ 1,454	$ 1,655	$ 1,970
Changes in Fair Value:
Due to Payoffs	(164)	(201)	(315)
Total Changes in Fair Value of Mortgage Servicing Rights	(164)	(201)	(315)
Balance at End of Year	$ 1,290	$ 1,454	$ 1,655

Mortgage Servicing Rights (Amor

Mortgage Servicing Rights (Amortization method rollforward) (Details 3) - Mortgage Servicing Rights - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in Carrying Value of Mortgage Servicing Rights Accounted for Under the Amortization Method, Net of a Valuation Allowance
Balance at beginning of Year	$ 23,168	$ 22,008	$ 21,032
Servicing Rights that Resulted From Asset Transfers	2,470	3,976	3,847
Amortization	(2,618)	(2,816)	(2,892)
Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries)	0	0	21
Balance at end of Year	23,020	23,168	22,008
Valuation Allowance [Roll Forward]
Balance at Beginning of Year	0	0	(21)
Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries)	0	0	21
Balance at End of Year	0	0	0
Fair Value:
Balance at Beginning of Year	26,716	25,148	24,804
Balance at End of Year	$ 29,218	$ 26,716	$ 25,148

Mortgage Servicing Rights (Key

Mortgage Servicing Rights (Key assumptions) (Details 4) - Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Key assumptions used in estimating the fair value of mortgage servicing rights
Weighted-Average Constant Prepayment Rate (as a percent)	7.01%	8.50%
Weighted-Average Life (in years)	7 years 10 months 19 days	7 years 1 month 4 days
Weighted-Average Note Rate (as a percent)	4.06%	4.04%
Weighted-Average Discount Rate (as a percent)	9.59%	8.87%

Mortgage Servicing Rights (Sens

Mortgage Servicing Rights (Sensitivity analysis) (Details 5) - Mortgage Servicing Rights - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Constant Prepayment Rate
Decrease in fair value from 25 basis points ("bps") adverse change	$ (361)	$ (332)
Decrease in fair value from 50 bps adverse change	(716)	(657)
Discount Rate
Decrease in fair value from 25 bps adverse change	(325)	(289)
Decrease in fair value from 50 bps adverse change	$ (643)	$ (572)

Premises and Equipment (Details

Premises and Equipment (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Premises and Equipment
Cost	$ 466,199	$ 468,387
Accumulated Depreciation and Amortization	(314,362)	(337,461)
Net Book Value	151,837	130,926
Depreciation and amortization (including capital lease amortization) included in noninterest expense	14,400	13,000	$ 12,900
Premises
Premises and Equipment
Cost	339,441	331,566
Accumulated Depreciation and Amortization	(238,450)	(243,069)
Net Book Value	100,991	88,497
Impairment charge	0	0	$ 0
Equipment
Premises and Equipment
Cost	120,165	130,228
Accumulated Depreciation and Amortization	(71,767)	(90,319)
Net Book Value	48,398	39,909
Capital leases
Premises and Equipment
Cost	6,593	6,593
Accumulated Depreciation and Amortization	(4,145)	(4,073)
Net Book Value	$ 2,448	$ 2,520

Other Assets (Details 1)

Other Assets (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Components of Other Assets
Federal Home Loan Bank and Federal Reserve Bank Stock	$ 35,858	$ 40,645
Derivative Financial Instruments	14,604	10,518
Low-Income Housing and Other Equity Investments	85,860	87,632
Deferred Compensation Plan Assets	31,871	29,230
Prepaid Expenses	8,533	7,944
Accounts Receivable	18,996	49,264
Other	35,160	27,363
Total	$ 230,882	$ 252,596

Time Deposits (Details 1)

Time Deposits (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Time deposits classified according to the contractual maturities
2,019	$ 1,441,580
2,020	119,894
2,021	115,528
2,022	32,881
2,023	28,035
Thereafter	7,604
Total	1,745,522	$ 1,688,092
Time deposits with balances of $100,000 or more, classified according to the contractual maturities
Three Months or Less	756,146
Over Three Months through Six Months	197,485
Over Six Months through Twelve Months	352,539
Over Twelve Months	191,839
Total	1,498,009	1,400,000
Government entity deposits	$ 1,100,000	$ 1,300,000

Borrowings (Short-term borrowin

Borrowings (Short-term borrowings) (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Short-term Borrowings
Securities Sold Under Agreements to Repurchase	$ 504,296	$ 505,293
Amounts Outstanding	199	0
Securities Sold Under Agreements to Repurchase
Short-term Borrowings
Amounts Outstanding	$ 4,196	$ 1,603
Weighted Average Interest Rate (as a percent)	1.19%	0.14%
Long-term Repurchase Agreements with Government Entities
Short-term Borrowings
Securities Sold Under Agreements to Repurchase	$ 100	$ 3,700
Long-term Repurchase Agreements with Private Institutions
Short-term Borrowings
Securities Sold Under Agreements to Repurchase	$ 500,000	$ 500,000

Borrowings (Narrative) (Details

Borrowings (Narrative) (Details 2) $ in Thousands	Dec. 31, 2018USD ($)Y	Dec. 31, 2017USD ($)
Securities sold under repurchase agreements
Securities Sold Under Agreements to Repurchase	$ 504,296	$ 505,293
Long-term Repurchase Agreements with Government Entities
Securities sold under repurchase agreements
Securities Sold Under Agreements to Repurchase	$ 100	3,700
Repurchase agreements, Weighted average interest rate (as a percent)	1.30%
Long-term Repurchase Agreements with Private Institutions
Securities sold under repurchase agreements
Securities Sold Under Agreements to Repurchase	$ 500,000	$ 500,000
Repurchase agreements, Weighted average interest rate (as a percent)	3.64%
Repurchase agreements, Weighted average maturity period (in days or years) | Y	2.6
Repurchase agreements, Decreased weighted average maturity period if agreements terminated at earlier specified dates (in years) | Y	2

Other Debt (Details 1)

Other Debt (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Long-Term Debt
Federal Home Loan Bank, Advances, Weighted Average Interest Rate (as a percent)	1.93%
Total	$ 135,643	$ 260,716
Maximum percentage of the total assets that can be borrowed from the FHLB by the entity	45.00%
Federal Home Loan Bank Advance
Long-Term Debt
Other Debt	$ 125,000	250,000
Undrawn line of credit with the FHLB or FRB	2,200,000
Capital Lease Obligations
Long-Term Debt
Capital Lease Obligations	$ 10,643	$ 10,716
Lease term (in years)	60 years
Fixed lease payments through December 2022	$ 800
Federal Reserve Bank Advance
Long-Term Debt
Undrawn line of credit with the FHLB or FRB	$ 538,500

Other Debt (Excluding capital l

Other Debt (Excluding capital lease obligation, annual maturities) (Details 2) - Non-Recourse Debt and Federal Home Loan Bank Advance $ in Thousands	Dec. 31, 2018USD ($)
Annual maturities of long term debt exclusive of capital lease obligations
2,019	$ 50,000
2,020	75,000
2,021	0
2,022	0
2,023	0
Thereafter	0
Total	$ 125,000

Shareholders' Equity (Capital)

Shareholders' Equity (Capital) (Details 1) $ / shares in Units, $ in Thousands	2 Months Ended	12 Months Ended			210 Months Ended
	Feb. 15, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)Y$ / sharesshares	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2015USD ($)
Minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts [Line Items]
Shareholders' Equity		$ 1,268,200	$ 1,231,868	$ 1,161,537	$ 1,268,200	$ 1,116,260
Well Capitalized Minimum Common Equity Tier One Ratio (as a percent)		6.50%	6.50%		6.50%
Well Capitalized Minimum Tier 1 Capital Ratio (as a percent)		8.00%	8.00%		8.00%
Well Capitalized Minimum Total Capital Ratio (as a percent)		10.00%	10.00%		10.00%
Well Capitalized Minimum Tier 1 Leverage Ratio (as a percent)		5.00%	5.00%		5.00%
Dividends
Number of prior calendar years considered for payment of dividends in excess of the sum of net income | Y		2
Common Stock Repurchase Program
Number of shares of common stock repurchased | shares		1,079,397			55,300,000
Amount returned to shareholders on stock repurchase		$ 91,988	$ 47,076	$ 61,807	$ 2,100,000
Average cost of shares repurchased (in dollars per share) | $ / shares		$ 81.80			$ 39.14
Treasury Stock Value Acquired Cost Method Share Repurchase Program		$ 88,300
Parent [Member]
Minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts [Line Items]
Shareholders' Equity		1,268,200	1,231,868		$ 1,268,200
Common Equity Tier One Capital		1,290,723	1,238,063		1,290,723
Tier 1 Capital		1,290,723	1,238,063		1,290,723
Total Capital		$ 1,404,238	$ 1,352,231		$ 1,404,238
Common Equity Tier One Ratio		13.07%	13.24%		13.07%
Tier 1 Capital Ratio (as a percent)		13.07%	13.24%		13.07%
Total Capital Ratio (as a percent)		14.21%	14.46%		14.21%
Tier 1 Leverage Ratio (as a percent)		7.60%	7.26%		7.60%
Subsidiaries [Member]
Minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts [Line Items]
Shareholders' Equity		$ 1,195,132	$ 1,161,037		$ 1,195,132
Common Equity Tier One Capital		1,229,227	1,178,804		1,229,227
Tier 1 Capital		1,229,227	1,178,804		1,229,227
Total Capital		$ 1,342,742	$ 1,292,972		$ 1,342,742
Common Equity Tier One Ratio		12.46%	12.62%		12.46%
Tier 1 Capital Ratio (as a percent)		12.46%	12.62%		12.46%
Total Capital Ratio (as a percent)		13.61%	13.85%		13.61%
Tier 1 Leverage Ratio (as a percent)		7.24%	6.92%		7.24%
Subsequent Event
Common Stock Repurchase Program
Number of shares of common stock repurchased | shares	298,500
Amount returned to shareholders on stock repurchase	$ 22,500
Average cost of shares repurchased (in dollars per share) | $ / shares	$ 75.46

Shareholders' Equity (AOCI tax

Shareholders' Equity (AOCI tax effect) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Comprehensive Income, Before Tax:
Net Unrealized Gains (Losses) Arising During the Period	$ (11,051)	$ (5,263)	$ (18,647)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	2,164	1,982	1,605
Net Unrealized Gains (Losses) on Investment Securities	(8,887)	(3,281)	(17,042)
Net Actuarial Gains (Losses) Arising During the Period	(4,468)	884	(954)
Amortization of Net Actuarial Losses (Gains)	1,835	1,382	1,224
Amortization of Prior Service Credit, before tax	(567)	(322)	(322)
Defined Benefit Plans, Net	(3,200)	1,944	(52)
Other Comprehensive Income (Loss)	(12,087)	(1,337)	(17,094)
Other Comprehensive Income, Tax Effect:
Net Unrealized Gains Arising During the Period	(2,931)	(2,078)	(7,358)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	569	783	634
Net Unrealized Gains (Losses) on Investment Securities	(2,362)	(1,295)	(6,724)
Net Actuarial Gains (Losses) Arising During the Period	(1,184)	349	(377)
Amortization of Net Actuarial Losses (Gains)	460	545	483
Amortization of Prior Service Credit	(150)	(127)	(127)
Defined Benefit Plans, Net	(874)	767	(21)
Other Comprehensive Income (Loss)	(3,236)	(528)	(6,745)
Other Comprehensive Income, Net of Tax:
Net Unrealized Gains (Losses) Arising During the Period	(8,120)	(3,185)	(11,289)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities after Tax	1,595	1,199	971
Net Unrealized Gains (Losses) on Investment Securities	(6,525)	(1,986)	(10,318)
Net Actuarial Losses Arising During the Period	(3,284)	535	(577)
Amortization of Net Actuarial Losses (Gains)	1,375	837	741
Amortization of Prior Service Credit	(417)	(195)	(195)
Defined Benefit Plans, Net	(2,326)	1,177	(31)
Other Comprehensive Income (Loss)	$ (8,851)	$ (809)	$ (10,349)

Shareholders' Equity (AOCI roll

Shareholders' Equity (AOCI rollforward) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	$ 1,231,868	$ 1,161,537	$ 1,116,260
Other Comprehensive Income (Loss)	(8,851)	(809)	(10,349)
Reclassification of the Income Tax Effect of the Tax Reform from AOCI to RE	0
Balance at End of Period	1,268,200	1,231,868	1,161,537
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(27,715)	(28,892)	(28,861)
Other Comprehensive Income (Loss) Before Reclassification	(3,284)	535	(577)
Amounts Reclassified from Accumulated Other Comprehensive Income	958	642	546
Other Comprehensive Income (Loss)	(2,326)	1,177	(31)
Reclassification of the Income Tax Effect of the Tax Reform from AOCI to RE	(5,969)
Balance at End of Period	(36,010)	(27,715)	(28,892)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(34,715)	(33,906)	(23,557)
Other Comprehensive Income (Loss) Before Reclassification	(11,404)	(2,650)	(11,866)
Amounts Reclassified from Accumulated Other Comprehensive Income	2,553	1,841	1,517
Other Comprehensive Income (Loss)	(8,851)	(809)	(10,349)
Reclassification of the Income Tax Effect of the Tax Reform from AOCI to RE	(7,477)
Balance at End of Period	(51,043)	(34,715)	(33,906)
Available-for-sale Securities | Unrealized Gains and Losses on Net Investment Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(1,915)	1,270	12,559
Other Comprehensive Income (Loss) Before Reclassification	(8,120)	(3,185)	(11,289)
Amounts Reclassified from Accumulated Other Comprehensive Income	0	0	0
Other Comprehensive Income (Loss)	(8,120)	(3,185)	(11,289)
Reclassification of the Income Tax Effect of the Tax Reform from AOCI to RE	(412)
Balance at End of Period	(10,447)	(1,915)	1,270
Held-to-maturity Securities | Unrealized Gains and Losses on Net Investment Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(5,085)	(6,284)	(7,255)
Other Comprehensive Income (Loss) Before Reclassification	0	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income	1,595	1,199	971
Other Comprehensive Income (Loss)	1,595	1,199	971
Reclassification of the Income Tax Effect of the Tax Reform from AOCI to RE	(1,096)
Balance at End of Period	$ (4,586)	$ (5,085)	$ (6,284)

Shareholders' Equity (Income st

Shareholders' Equity (Income statement reclass) (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for Income Taxes	$ (50,624)	$ (83,392)	$ (78,133)
Salaries and Benefits	(213,208)	(203,729)	(199,353)
Net Income	219,602	184,672	181,461
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income	(2,553)	(1,841)	(1,517)
Amortization of Unrealized Gains(Losses) of Investment Securities Transferred from AFS to HTM [Member] | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment Income, Interest	(2,164)	(1,982)	(1,605)
Provision for Income Taxes	569	783	634
Net Income	(1,595)	(1,199)	(971)
Amortization of Defined Benefit Pension Items | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for Income Taxes	310	418	356
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(1,268)	(1,060)	(902)
Net Income	(958)	(642)	(546)
Prior Service Credit | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Benefits	567	322	322
Net Actuarial Losses | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Benefits	$ (1,835)	$ (1,382)	$ (1,224)

Earnings Per Share (Details 1)

Earnings Per Share (Details 1) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Denominator for Basic Earnings Per Share (in shares)	41,714,770	42,280,931	42,644,100
Dilutive Effect of Equity Based Awards (in shares)	284,629	326,126	235,683
Denominator for Diluted Earnings Per Share (in shares)	41,999,399	42,607,057	42,879,783
Antidilutive Stock Options and Restricted Stock Outstanding (in shares)	0	0	0

Business Segments (Details 1)

Business Segments (Details 1) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)atmbranch	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Business segment financial information
Federal and State Effective Tax Rate used for Segment Reporting	26.00%
Net Interest Income	$ 486,352	$ 457,238	$ 417,579
Provision for Credit Losses	13,425	16,900	4,750
Net Interest Income After Provision for Credit Losses	472,927	440,338	412,829
Noninterest Income	168,923	185,417	197,343
Noninterest Expense	(371,624)	(357,691)	(350,578)
Income Before Provision for Income Taxes	270,226	268,064	259,594
Provision for Income Taxes	(50,624)	(83,392)	(78,133)
Net Income	219,602	184,672	181,461
Total Assets	$ 17,143,974	17,089,052	16,492,367
Retail Banking
Business segment financial information
Number of branch locations through which products and services are delivered to customers | branch	69
Number of ATM's through which products and services are delivered to customers | atm	382
Net Interest Income	$ 264,459	264,041	242,967
Provision for Credit Losses	14,898	14,008	10,700
Net Interest Income After Provision for Credit Losses	249,561	250,033	232,267
Noninterest Income	79,004	85,042	91,824
Noninterest Expense	(211,761)	(209,807)	(208,389)
Income Before Provision for Income Taxes	116,804	125,268	115,702
Provision for Income Taxes	(29,172)	(44,545)	(41,067)
Net Income	87,632	80,723	74,635
Total Assets	6,365,263	5,936,568	5,342,078
Commercial Banking
Business segment financial information
Net Interest Income	179,577	171,038	156,080
Provision for Credit Losses	(760)	(160)	(7,322)
Net Interest Income After Provision for Credit Losses	180,337	171,198	163,402
Noninterest Income	23,733	21,670	26,967
Noninterest Expense	(81,344)	(74,209)	(70,405)
Income Before Provision for Income Taxes	122,726	118,659	119,964
Provision for Income Taxes	(28,496)	(41,797)	(42,667)
Net Income	94,230	76,862	77,297
Total Assets	3,958,523	3,742,991	3,565,912
Investment Services
Business segment financial information
Net Interest Income	41,222	29,693	24,714
Provision for Credit Losses	(61)	(21)	(23)
Net Interest Income After Provision for Credit Losses	41,283	29,714	24,737
Noninterest Income	55,338	57,105	57,396
Noninterest Expense	(65,847)	(61,674)	(59,782)
Income Before Provision for Income Taxes	30,774	25,145	22,351
Provision for Income Taxes	(8,113)	(9,303)	(8,270)
Net Income	22,661	15,842	14,081
Total Assets	349,832	336,455	280,410
Treasury and Other
Business segment financial information
Net Interest Income	1,094	(7,534)	(6,182)
Provision for Credit Losses	(652)	3,073	1,395
Net Interest Income After Provision for Credit Losses	1,746	(10,607)	(7,577)
Noninterest Income	10,848	21,600	21,156
Noninterest Expense	(12,672)	(12,001)	(12,002)
Income Before Provision for Income Taxes	(78)	(1,008)	1,577
Provision for Income Taxes	15,157	12,253	13,871
Net Income	15,079	11,245	15,448
Total Assets	$ 6,470,356	$ 7,073,038	$ 7,303,967

Employee Benefits (Defined cont

Employee Benefits (Defined contribution plans) (Details1 )	12 Months Ended
	Dec. 31, 2018USD ($)components	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Defined Contribution Plans
Number of company contribution components, Retirement Savings Plan | components	3
Fixed percentage of employer's contribution based on eligible compensation	3.00%
Employee contribution limit per calendar year (as a percent of compensation)	50.00%
Employee's contribution matched by employer (in dollars)	$ 1
Employer match of employee contributions upto 2% of eligible compensation	$ 1.25
Percentage of eligible compensation, matched $1.25 for by employer for each dollar amount contributed by participants	2.00%
Employer match of employee contributions over 2% upto 5% of eligible compensation	$ 0.50
Percentage of eligible compensation, matched $0.50 for by employer for each dollar amount contributed by participants, low end of range	2.00%
Percentage of eligible compensation, matched $0.50 for by employer for each dollar amount contributed by participants, high end of range	5.00%
Total expense for all components of the company's defined contribution plans	$ 14,500,000	$ 13,500,000	$ 12,800,000

Employee Benefits (Defined bene

Employee Benefits (Defined benefit and postretirement benefit plans) (Details 2)	12 Months Ended
	Dec. 31, 2018USD ($)planY	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Pension Benefits
Employee benefits
Number of defined benefit plans | plan	2
Reconciliation of changes in benefit obligations
Benefit Obligation at Beginning of Year	$ 110,080,000	$ 107,593,000
Service Cost	0	0	$ 0
Interest Cost	4,193,000	4,665,000	4,882,000
Plan Amendment	0	0
Actuarial Losses (Gains)	5,031,000	(6,828,000)
Employer Benefits Paid	6,580,000	9,006,000
Benefit Obligation at End of Year	102,662,000	110,080,000	107,593,000
Reconciliation of changes in fair value of plan assets
Fair Value of Plan Assets at Beginning of Year	96,908,000	83,383,000
Actual Return on Plan Assets	(5,246,000)	12,047,000
Employer Contributions	471,000	10,484,000
Employer Benefits Paid	6,580,000	9,006,000
Fair Value of Plan Assets at End of Year	85,553,000	96,908,000	83,383,000
Funded Status at End of Year	(17,109,000)	(13,172,000)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax
Net Actuarial Gains (Losses)	42,127,000	32,730,000
Prior Service Credit	0	0
Total Amounts Recognized in Accumulated Other Comprehensive Income, Net of Tax	(42,127,000)	(32,730,000)
Pension Benefits | Excess retirement Plan
Employee benefits
Accumulated benefit obligation	$ 3,600,000	$ 3,900,000
Postretirement Benefits
Employee benefits
Health Care Cost Trend Rate Assumed, Next Fiscal Year	6.00%	6.30%
Retirees' age and above which Medicare supplemental plan subsidy is provided (in years) | Y	65
Limit on annual credit provided in HRA to eligible employees	$ 1,200
Reconciliation of changes in benefit obligations
Benefit Obligation at Beginning of Year	24,206,000	$ 24,308,000
Service Cost	457,000	453,000	513,000
Interest Cost	936,000	1,093,000	1,134,000
Plan Amendment	0	(2,730,000)
Actuarial Losses (Gains)	869,000	(2,052,000)
Employer Benefits Paid	1,278,000	970,000
Benefit Obligation at End of Year	23,452,000	24,206,000	24,308,000
Reconciliation of changes in fair value of plan assets
Fair Value of Plan Assets at Beginning of Year	0	0
Actual Return on Plan Assets	0	0
Employer Contributions	1,278,000	970,000
Employer Benefits Paid	1,278,000	970,000
Fair Value of Plan Assets at End of Year	0	0	$ 0
Funded Status at End of Year	(23,452,000)	(24,206,000)
Participants contributions	600,000	500,000
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax
Net Actuarial Gains (Losses)	(4,261,000)	(3,143,000)
Prior Service Credit	1,856,000	1,872,000
Total Amounts Recognized in Accumulated Other Comprehensive Income, Net of Tax	6,117,000	5,015,000
Other Pension Plan [Member]
Reconciliation of changes in benefit obligations
Actuarial Losses (Gains)	(5,400,000)	6,000,000
Postemployment Retirement Benefits [Member]
Reconciliation of changes in benefit obligations
Actuarial Losses (Gains)	$ (1,600,000)	$ 1,800,000

Employee Benefits (Components f

Employee Benefits (Components fo net Periodic benefit cost) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits
Net periodic benefit cost for pension plans and the postretirement benefit plan
Service Cost	$ 0	$ 0	$ 0
Interest Cost	4,193	4,665	4,882
Expected Return on Plan Assets	(5,122)	(5,011)	(5,121)
Amortization of Prior Service Credit	0	0	0
Amortization of Net Actuarial Losses (Gains)	2,099	1,817	1,617
Net Periodic Benefit Cost	$ 1,170	$ 1,471	$ 1,378
Weighted average assumptions used to determine the benefit obligations
Discount Rate (as a percent)	4.41%	3.90%
Weighted average assumptions used to determine the net periodic benefit cost
Discount rate (as a percent)	3.90%	4.45%	4.70%
Expected Long-Term Rate of Return on Plan Assets (as a percent)	5.75%	5.75%	6.00%
Health Care Cost Trend Rate (as a percent)	0.00%	0.00%	0.00%
A one percent change in the health care cost trend rate assumption impact on cost
Expected future employer contributions, next fiscal year	$ 500
Expected benefits to be paid in each of the next five years and in the aggregate for the five years thereafter
2,019	6,918
2,020	7,020
2,021	7,163
2,022	7,189
2,023	7,195
Years 2024-2028	35,466
Postretirement Benefits
Net periodic benefit cost for pension plans and the postretirement benefit plan
Service Cost	457	$ 453	$ 513
Interest Cost	936	1,093	1,134
Expected Return on Plan Assets	0	0	0
Amortization of Prior Service Credit	(567)	(322)	(322)
Amortization of Net Actuarial Losses (Gains)	(264)	(435)	(393)
Net Periodic Benefit Cost	$ 562	$ 789	$ 932
Weighted average assumptions used to determine the benefit obligations
Discount Rate (as a percent)	4.48%	3.96%
Health Care Cost Trend Rate Assumed, Next Fiscal Year	6.00%	6.30%
Ultimate health care cost trend rate (as a percent)	4.50%
Year that reaches the ultimate health care cost trend rate	2,036
Weighted average assumptions used to determine the net periodic benefit cost
Discount rate (as a percent)	3.96%	4.57%	4.74%
Expected Long-Term Rate of Return on Plan Assets (as a percent)	0.00%	0.00%	0.00%
Health Care Cost Trend Rate (as a percent)	6.30%	6.50%	6.70%
A one percent change in the health care cost trend rate assumption impact on cost
Expected future employer contributions, next fiscal year	$ 900
Expected benefits to be paid in each of the next five years and in the aggregate for the five years thereafter
2,019	886
2,020	943
2,021	1,020
2,022	1,137
2,023	1,231
Years 2024-2028	$ 7,982

Employee Benefits (Retirement p

Employee Benefits (Retirement plan assets) (Details 4)	12 Months Ended
	Dec. 31, 2018D
Asset allocation guidelines
Effect of market fluctuations in cash flow on target allocation limits (as a percent)	5.00%
Period during which asset allocation is expected to conform to range limits (in days)	90
S&P 500 Index
Defined benefit pension plan disclosure
Performance benchmark (as a percent)	36.00%
MSCI EAFE Index
Defined benefit pension plan disclosure
Performance benchmark (as a percent)	24.00%
Barclays Capital Aggregate Bond Index
Defined benefit pension plan disclosure
Performance benchmark (as a percent)	40.00%
Equity Securities
Defined benefit pension plan disclosure
Target plan asset allocations	60.00%
Fixed Income Securities
Defined benefit pension plan disclosure
Target plan asset allocations	40.00%
Minimum [Member]
Asset allocation guidelines
Fixed income securities, percentage of variable component in strategic targets (as a percent)	10.00%
Minimum [Member] | Equity Securities, Domestic
Defined benefit pension plan disclosure
Target plan asset allocations	50.00%
Minimum [Member] | Equity Securities, International
Defined benefit pension plan disclosure
Target plan asset allocations	0.00%
Minimum [Member] | Cash
Defined benefit pension plan disclosure
Target plan asset allocations	0.00%
Maximum [Member]
Asset allocation guidelines
Fixed income securities, percentage of variable component in strategic targets (as a percent)	20.00%
Maximum [Member] | Equity Securities, Domestic
Defined benefit pension plan disclosure
Target plan asset allocations	100.00%
Maximum [Member] | Equity Securities, International
Defined benefit pension plan disclosure
Target plan asset allocations	50.00%
Maximum [Member] | Cash
Defined benefit pension plan disclosure
Target plan asset allocations	20.00%

Employee Benefits (Fair values

Employee Benefits (Fair values of retirement plan assets) (Details 5) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined benefit pension plan disclosure
Fair value of plan assets	$ 85,553	$ 96,908	$ 83,383
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined benefit pension plan disclosure
Fair value of plan assets	85,553
Cash
Defined benefit pension plan disclosure
Fair value of plan assets	726	2,156
Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined benefit pension plan disclosure
Fair value of plan assets	726
Large Cap [Member]
Defined benefit pension plan disclosure
Fair value of plan assets	1,593	1,748
Large Cap [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined benefit pension plan disclosure
Fair value of plan assets	1,593
Equity Security - Mutual Funds: Mixed-Cap
Defined benefit pension plan disclosure
Fair value of plan assets	25,298	29,459
Equity Security - Mutual Funds: Mixed-Cap | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined benefit pension plan disclosure
Fair value of plan assets	25,298
Equity Security - Mutual Funds: International
Defined benefit pension plan disclosure
Fair value of plan assets	21,621	24,539
Equity Security - Mutual Funds: International | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined benefit pension plan disclosure
Fair value of plan assets	21,621
Equity Security - Mutual Funds: Emerging Market
Defined benefit pension plan disclosure
Fair value of plan assets	2,150	2,305
Equity Security - Mutual Funds: Emerging Market | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined benefit pension plan disclosure
Fair value of plan assets	2,150
Fixed Income - Mutual Funds
Defined benefit pension plan disclosure
Fair value of plan assets	34,165	$ 36,701
Fixed Income - Mutual Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined benefit pension plan disclosure
Fair value of plan assets	$ 34,165

Share-Based Compensation (Detai

Share-Based Compensation (Details 1) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation [Line Items]
Total shares authorized	2,100,000
Shares available for future grants of stock options or restricted stock	1,800,000
Compensation Expense	$ 8,146	$ 7,369	$ 6,787
Income Tax Benefit	$ 2,160	$ 2,910	2,680
Stock Options [Roll Forward]
Outstanding at the beginning of the period (in shares)	303,552
Exercised (in shares)	(39,664)
Outstanding at the end of the period (in shares)	263,888	303,552
Vested and Exercisable at the end of the period (in shares)	263,888
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 45.26
Exercised (in dollars per share)	45.16
Outstanding at the end of the period (in dollars per share)	45.27	$ 45.26
Vested and Exercisable at the end of period (in dollars per share)	$ 45.27
Weighted Average Remaining Contractual Term
Outstanding at the end of the period (in years)	3 years
Vested and Exercisable at the end of period (in years)	3 years
Aggregate Intrinsic Value
Outstanding at the end of the period	$ 5,818
Vested and Exercisable at the end of the period	5,818
Stock options activity
Intrinsic Value of Stock Options Exercised	1,634	$ 5,991	1,990
Cash Received from Stock Options Exercised	1,791	7,502	3,546
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 240	$ 2,003	$ 384
Stock Options
Share-based Compensation [Line Items]
Expiration period	10 years
Restricted Stock
Restricted Stock
Unrecognized compensation cost related to unvested restricted stock	$ 10,600
Weighted average period during which unrecognized compensation cost is expected to be recognized (in years)	1 year 10 months 4 days
Number of Shares
Unvested at the beginning of the period (in shares)	320,103	270,523	268,813
Granted (in shares)	120,173	124,460	121,495
Vested (in shares)	(110,231)	(52,822)	(105,891)
Forfeited (in shares)	(15,558)	(22,058)	(13,894)
Unvested at the end of the period (in shares)	314,487	320,103	270,523
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share)	$ 69.36	$ 60.58	$ 55.92
Granted (in dollars per share)	83.87	84.53	64.40
Vested (in dollars per share)	59.41	60.06	53.46
Forfeited (in dollars per share)	73.82	69.46	58.14
Unvested at the end of the period (in dollars per share)	$ 78.17	$ 69.36	$ 60.58
Grant Date Fair Value of Restricted Stock that Vested During the Year
Vested (in dollars)	$ 9,081	$ 4,493	$ 5,661
Service-Based Restricted Stock
Number of Shares
Unvested at the end of the period (in shares)	38,560
Restricted Stock Units (RSUs)
Share-based Compensation [Line Items]
Compensation Expense	$ 600	$ 3,400	$ 5,900
Number of Shares
Unvested at the beginning of the period (in shares)	116,489	154,832	135,505
Granted (in shares)			58,541
Vested (in shares)	(62,252)	(29,281)	(31,660)
Forfeited (in shares)	(2,173)	(9,062)	(7,554)
Unvested at the end of the period (in shares)	52,064	116,489	154,832
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share)	$ 60.22	$ 59.04	$ 55.86
Granted (in dollars per share)			63.92
Vested (in dollars per share)	57	58.74	55.17
Forfeited (in dollars per share)	63.92	60.17	56.08
Unvested at the end of the period (in dollars per share)	$ 63.92	$ 60.22	$ 59.04
Grant Date Fair Value of Restricted Stock that Vested During the Year
Vested (in dollars)	$ 5,127	$ 2,516	$ 1,897
Maximum [Member] | Restricted Stock
Share-based Compensation [Line Items]
Vesting period (in years)	4 years
Maximum [Member] | Restricted Stock Units (RSUs)
Share-based Compensation [Line Items]
Vesting period (in years)	4 years
Minimum [Member] | Restricted Stock
Share-based Compensation [Line Items]
Vesting period (in years)	1 year
Minimum [Member] | Restricted Stock Units (RSUs)
Share-based Compensation [Line Items]
Vesting period (in years)	3 years

Income Taxes (Deferred tax liab

Income Taxes (Deferred tax liabilities & assets and reconciliation of statutory federal income taxes to the company's effective tax rate) (Details 1) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal			$ 45,464	$ 73,176	$ 69,061
State			11,434	6,039	1,885
Total Current			56,898	79,215	70,946
Deferred:
Federal			(2,172)	5,042	6,947
State			(4,102)	(865)	240
Total Deferred			(6,274)	4,177	7,187
Provision for Income Taxes			50,624	83,392	78,133
Net tax charge/(benefit) recorded directly to consolidated shareholders' equity			3,200	500	$ 7,900
Deferred Tax Liabilities:
Accelerated Depreciation			2,864	0
Accrued Pension Cost			(11,270)	(11,245)
Federal Home Loan Bank Stock			(3,416)	(3,408)
Lease Transactions			(53,230)	(57,458)
Energy Tax Credits			(5,274)	(8,821)
Deferred Tax Liabilities, Investment In Variable Interest Entities			(3,769)	(3,407)
Deferred Loan Fees			(6,688)	(6,903)
Originated Mortgage Servicing Rights			(6,548)	(6,646)
Other			(1,420)	(1,883)
Gross Deferred Tax Liabilities			(94,479)	(99,771)
Deferred Tax Assets:
Accelerated Depreciation			0	1,844
Allowance for Loan Losses			30,045	30,148
Minimum Pension Liability			12,989	12,114
Accrued Expenses			14,805	9,937
Postretirement Benefit Obligations			8,396	8,595
Capital Lease Expenses			2,172	2,168
Restricted Stock			5,178	6,223
Deferred Tax Assets, Net Unrealized Losses on Investment Securities			5,421	3,059
Deductible State and Local Taxes			3,242	2,461
Other			4,244	5,183
Gross Deferred Tax Assets Before Valuation Allowance			86,492	81,732
Valuation Allowance			(1,102)	(955)
Gross Deferred Tax Assets After Valuation Allowance			85,390	80,777
Net Deferred Tax Liabilities			(9,089)	(18,994)
Tax Cuts and Jobs Act of 2017 additional tax expense	$ (300)	$ (100)		$ 3,600
Base year reserves included in retained earnings			18,200
Unrecognized deferred federal income tax liability			$ 4,800
Reconciliation of the Statutory Federal Income Tax Rate to the Company's Effective Tax Rate
Statutory Federal Income Tax Rate (as a percent)			21.00%	35.00%	35.00%
Increase (Decrease) in Income Tax Rate Resulting From:
State Taxes, Net of Federal Income Tax (as a percent)			2.29%	1.50%	0.60%
Tax Reserve Adjustments (as a percent)			0.21%	0.09%	(0.18%)
Leveraged Leases (as a percent)			0.22%	(1.18%)	(0.69%)
Low-Income Housing Investments (as a percent)			(1.04%)	(1.03%)	(0.85%)
Bank-Owned Life Insurance (as a percent)			(0.55%)	(0.85%)	(0.88%)
Tax-Exempt Income (as a percent)			(1.29%)	(2.57%)	(2.71%)
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent			0.34%	0.83%	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Leases, Percent			(0.83%)	(0.03%)	(0.13%)
Tax Reform Effects			(0.75%)	1.25%	0.00%
Other (as a percent)			(0.19%)	(0.24%)	(0.06%)
Effective Tax Rate (as a percent)			18.73%	31.11%	30.10%

Income Taxes (Unrecognized tax

Income Taxes (Unrecognized tax benefits) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of liability for Unrecognized Tax Benefits
Unrecognized Tax Benefits at the Beginning of Year	$ 5,292	$ 6,574	$ 11,602
Gross Increases, Related to Tax Positions Taken in a Prior Period	157	273	145
Gross Decreases, Related to Tax Positions Taken in a Prior Period	0	0	(230)
Gross Increases, Related to Current Period Tax Positions	885	1,124	395
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	0	1,002
Lapse of Statute of Limitations	(793)	(2,679)	(4,336)
Unrecognized Tax Benefits at the End of Year	5,541	5,292	6,574
Amount related to unrecognized tax benefits that if reversed would impact effective tax rate	5,500	5,300
Interest and penalties expense/(benefit) related to the liability for unrecognized tax benefits	100	100	$ 1,100
Accrued interest and penalties related to the liability for unrecognized tax benefits	$ 900	$ 900

Derivative Financial Instrume_3

Derivative Financial Instruments (Notional and fair value amounts) (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Interest Rate Lock Commitments
Derivative Financial Instruments Not Designated as Hedging Instruments
Notional Amount	$ 33,133	$ 35,422
Fair Value	871	789
Forward Commitments
Derivative Financial Instruments Not Designated as Hedging Instruments
Notional Amount	34,102	45,143
Fair Value	(352)	(56)
Interest Rate Swap Agreements Receive Fixed/Pay Variable Swaps
Derivative Financial Instruments Not Designated as Hedging Instruments
Notional Amount	505,034	374,670
Fair Value	(2,537)	(1,331)
Interest Rate Swap Agreements Pay Fixed/Receive Variable Swaps
Derivative Financial Instruments Not Designated as Hedging Instruments
Notional Amount	505,034	374,670
Fair Value	6,082	1,436
Foreign Exchange Contracts
Derivative Financial Instruments Not Designated as Hedging Instruments
Notional Amount	55,663	54,332
Fair Value	793	(13)
Visa Conversion Rate Swap Agreement [Member]
Derivative Financial Instruments Not Designated as Hedging Instruments
Notional Amount	80,746	70,571
Fair Value	$ 0	$ 0

Derivative Financial Instrume_4

Derivative Financial Instruments (Assets and liabilities) (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	$ 14,604	$ 10,518
Liability Derivatives	9,747	9,693
Interest Rate Lock Commitments
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	877	789
Liability Derivatives	6	0
Forward Commitments
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	4	14
Liability Derivatives	356	70
Interest Rate Swap Agreements
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	12,915	9,583
Liability Derivatives	9,370	9,478
Foreign Exchange Contracts
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	808	132
Liability Derivatives	$ 15	$ 145

Derivative Financial Instrume_5

Derivative Financial Instruments (Net gains or losses) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains (Losses) Recognized in the Statements of Income	$ 8,353	$ 8,362	$ 15,524
Interest Rate Lock Commitments | Mortgage Banking Income
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains (Losses) Recognized in the Statements of Income	3,534	5,643	7,834
Forward Commitments | Mortgage Banking Income
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains (Losses) Recognized in the Statements of Income	821	(1,275)	1,741
Interest Rate Swap Agreements | Other Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains (Losses) Recognized in the Statements of Income	1,835	698	2,987
Foreign Exchange Contracts | Other Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains (Losses) Recognized in the Statements of Income	3,163	3,296	2,962
Visa Conversion Rate Swap Agreement [Member] | Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains (Losses) Recognized in the Statements of Income	$ (1,000)	$ 0	$ 0

Derivative Financial Instrume_6

Derivative Financial Instruments (Conversion rate swap agreement narrative) (Details 4)	Jun. 28, 2018	Jun. 27, 2018	Dec. 31, 2018USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Derivative [Line Items]
Liability Derivatives			$ 9,747,000		$ 9,693,000
Visa Class B Restricted Securities
Derivative [Line Items]
Debt Instrument, Convertible, Conversion Ratio	1.6298	1.6483
Visa Conversion Rate Swap Agreement [Member]
Derivative [Line Items]
Liability Derivatives				$ 1,000,000
Visa Class B Restricted Securities
Derivative [Line Items]
Liability Derivatives			$ 0

Affordable Housing Projects T_3

Affordable Housing Projects Tax Credit Partnerships (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Net affordable housing tax credit investments and related unfunded commitments	$ 73,700	$ 71,700
Affordable Housing Tax Credit Investments, Unfunded Commitments [Abstract]
2,019	5,506
2,020	8,350
2,021	61
2,022	121
2,023	42
Thereafter	1,118
Total Unfunded Commitments	15,198
Investments in Affordable Housing Projects [Abstract]
Tax Credits and Other Tax Benefits recognized	13,572	13,569	$ 13,996
Amortization expense in provision for income taxes	$ 8,311	$ 8,373	$ 7,886

Balance Sheet Offsetting (Repos

Balance Sheet Offsetting (Repos - by maturity date and collateral type) (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	$ 504,296	$ 505,293
Debt Securities Issued by the U.S. Treasury and Government Agencies
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	315,463	312,876
Debt Securities Issued by States and Political Subdivisions
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	3,496	3,790
Residential - Government Agencies
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	97,699	101,256
Residential - U.S. Government Sponsored Enterprises
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	87,638	87,371
Maturity Up To 90 Days [Member]
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	2,706	2,703
Maturity Up To 90 Days [Member] | Debt Securities Issued by the U.S. Treasury and Government Agencies
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	0	0
Maturity Up To 90 Days [Member] | Debt Securities Issued by States and Political Subdivisions
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	1,906	1,200
Maturity Up To 90 Days [Member] | Residential - Government Agencies
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	800	1,503
Maturity Up To 90 Days [Member] | Residential - U.S. Government Sponsored Enterprises
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	0	0
Maturity 91 To 365 Days [Member]
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	1,590	2,590
Maturity 91 To 365 Days [Member] | Debt Securities Issued by the U.S. Treasury and Government Agencies
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	0	0
Maturity 91 To 365 Days [Member] | Debt Securities Issued by States and Political Subdivisions
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	1,590	2,590
Maturity 91 To 365 Days [Member] | Residential - Government Agencies
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	0	0
Maturity 91 To 365 Days [Member] | Residential - U.S. Government Sponsored Enterprises
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	0	0
Maturity 1 To 3 Years [Member]
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	225,000	150,000
Maturity 1 To 3 Years [Member] | Debt Securities Issued by the U.S. Treasury and Government Agencies
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	198,442	110,392
Maturity 1 To 3 Years [Member] | Debt Securities Issued by States and Political Subdivisions
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	0	0
Maturity 1 To 3 Years [Member] | Residential - Government Agencies
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	26,558	18,793
Maturity 1 To 3 Years [Member] | Residential - U.S. Government Sponsored Enterprises
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	0	20,815
Maturity After 3 Years [Member]
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	275,000	350,000
Maturity After 3 Years [Member] | Debt Securities Issued by the U.S. Treasury and Government Agencies
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	117,021	202,484
Maturity After 3 Years [Member] | Debt Securities Issued by States and Political Subdivisions
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	0	0
Maturity After 3 Years [Member] | Residential - Government Agencies
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	70,341	80,960
Maturity After 3 Years [Member] | Residential - U.S. Government Sponsored Enterprises
Securities sold under repurchase agreements
Securities Sold under Agreements to Repurchase	$ 87,638	$ 66,556

Balance Sheet Offsetting (Asset

Balance Sheet Offsetting (Assets and liabilities subject to MNA, or repurchase agreements) (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Liabilities:
Repurchase Agreements, Gross Amounts of Recognized Liabilities	$ 504,296	$ 505,293
Repurchase Agreements, Gross Amounts Offset in the Statements of Condition	0	0
Repurchase Agreements, Net Amounts of Liabilities Presented in the Statements of Condition	504,296	505,293
Repurchase Agreements, Fair Value of Collateral Pledged	504,296	505,293
Securities Sold under Agreements to Repurchase, Net Amount Offset Against Collateral	0	0
Interest Rate Swap Agreements
Offsetting Assets and Liabilities [Line items]
Net liability positions, aggregate fair value	300	3,200
Institutional Counterparties | Interest Rate Swap Agreements
Offsetting Assets and Liabilities [Line items]
Derivative Liability, Fair Value of Collateral	100	3,500
Assets:
Gross Amounts of Recognized Assets	7,572	5,453
Gross Amounts Offset in the Statements of Condition	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	7,572	5,453
Derivative Asset, Not Offset, Policy Election Deduction	1,490	4,017
Gross Amounts Not Offset in the Statements of Condition - FV of collateral pledged	0	0
Derivative Assets, Net Amount	6,082	1,436
Liabilities:
Gross Amounts of Recognized Liabilities	1,490	4,017
Gross Amounts Offset in the Statements of Condition	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1,490	4,017
Derivative Liability, Not Offset, Policy Election Deduction	1,490	4,017
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative Liabilities, Net Amount	0	0
Private Institutions
Offsetting Assets and Liabilities [Line items]
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	526,700	563,300
Liabilities:
Repurchase Agreements, Gross Amounts of Recognized Liabilities	500,000	500,000
Repurchase Agreements, Gross Amounts Offset in the Statements of Condition	0	0
Repurchase Agreements, Net Amounts of Liabilities Presented in the Statements of Condition	500,000	500,000
Repurchase Agreements, Fair Value of Collateral Pledged	500,000	500,000
Securities Sold under Agreements to Repurchase, Net Amount Offset Against Collateral	0	0
Government Entities
Offsetting Assets and Liabilities [Line items]
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	6,800	6,900
Liabilities:
Repurchase Agreements, Gross Amounts of Recognized Liabilities	4,296	5,293
Repurchase Agreements, Gross Amounts Offset in the Statements of Condition	0	0
Repurchase Agreements, Net Amounts of Liabilities Presented in the Statements of Condition	4,296	5,293
Repurchase Agreements, Fair Value of Collateral Pledged	4,296	5,293
Securities Sold under Agreements to Repurchase, Net Amount Offset Against Collateral	$ 0	$ 0

Commitments, Contingencies, a_3

Commitments, Contingencies, and Guarantees (Credit commitments) (Details 1) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 2,717,840
Commercial Letters of Credit
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	9,411
Unfunded Commitments to Extend Credit
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 2,646,085
Standby and Commercial Letters of Credit | Minimum [Member]
Other Commitments [Line Items]
Standby and Commercial Letters of Credit Remaining Term	1 month
Standby and Commercial Letters of Credit | Maximum [Member]
Other Commitments [Line Items]
Standby and Commercial Letters of Credit Remaining Term	14 months
Standby Letters of Credit
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 62,344
Assets Secured for Standby Letters of Credit	$ 38,900

Commitments, Contingencies, a_4

Commitments, Contingencies, and Guarantees (Rental expense and future minimum payments) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Rental expense
Minimum Rentals	$ 19,326	$ 18,331	$ 18,377
Sublease Rental Income	(7,674)	(7,056)	(6,551)
Total	11,652	$ 11,275	$ 11,826
Future minimum payments for capital leases
2,019	825
2,020	825
2,021	825
2,022	825
2,023	825
Thereafter	23,930
Total Future Minimum Lease Payments	28,055
Amounts Representing Interest	(17,412)
Present Value of Net Future Minimum Lease Payments	10,643
Future minimum payments for operating leases
2,019	12,455
2,020	11,266
2,021	11,025
2,022	10,416
2,023	9,482
Thereafter	104,877
Total Future Minimum Lease Payments	159,521
Minimum future rental income receivable under subleases from non-cancelable operating leases	$ 12,700

Commitments, Contingencies, a_5

Commitments, Contingencies, and Guarantees (Representations and warranties) (Details 3) - Residential Mortgage $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)Loan
Representations and Warranties
Unpaid principal balance of mortgage loans sold | $	$ 2,700
Number of mortgage loans repurchased	7
Unpaid principal balance of repurchased mortgage loan | $	$ 1.9
Number of Mortgage Loans Repurchased, Pending	0
Number of Mortgage Loans Repurchased due to Loan Servicing Activities, Pending	0
Current residential mortgage loans serviced for investors as percentage of total	99.00%

Fair Value of Assets and Liab_3

Fair Value of Assets and Liabilities (Fair value on recurring basis) (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets:
Available-for-Sale	$ 2,007,942	$ 2,232,979	$ 2,186,041
Loans Held for Sale	10,987	19,231
Derivative Assets	14,604	10,518
Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale	563,996	627,019	671,799
US Government-sponsored Enterprises Debt Securities [Member]
Assets:
Available-for-Sale	56
Debt Securities Issued by Corporations
Assets:
Available-for-Sale	223,140	266,111	269,179
Mortgage-Backed Securities
Assets:
Available-for-Sale	828,349	913,919	836,348
Residential - Government Agencies
Assets:
Available-for-Sale	190,442	235,360	243,844
Residential - U.S. Government Sponsored Enterprises
Assets:
Available-for-Sale	578,527	609,812	506,987
Commercial - Government Agencies
Assets:
Available-for-Sale	59,380	68,747	$ 85,517
Fair Value, Measurements, Recurring [Member]
Assets:
Available-for-Sale	2,007,942	2,232,979
Loans Held for Sale	10,987	19,231
Mortgage Servicing Rights	1,290	1,454
Other Assets	31,871	29,230
Derivative Assets	14,604	10,518
Total Assets Measured at Fair Value on a Recurring Basis	2,066,694	2,293,412
Liabilities:
Derivative Liabilities	9,747	9,693
Total Liabilities Measured at Fair Value on a Recurring Basis	9,747	9,693
Fair Value, Measurements, Recurring [Member] | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Available-for-Sale	392,401	425,930
Fair Value, Measurements, Recurring [Member] | Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale	563,996	627,019
Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Assets:
Available-for-Sale	56
Fair Value, Measurements, Recurring [Member] | Debt Securities Issued by Corporations
Assets:
Available-for-Sale	223,140	266,111
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities
Assets:
Available-for-Sale	828,349	913,919
Fair Value, Measurements, Recurring [Member] | Residential - Government Agencies
Assets:
Available-for-Sale	190,442	235,360
Fair Value, Measurements, Recurring [Member] | Residential - U.S. Government Sponsored Enterprises
Assets:
Available-for-Sale	578,527	609,812
Fair Value, Measurements, Recurring [Member] | Commercial - Government Agencies
Assets:
Available-for-Sale	59,380	68,747
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available-for-Sale	972	538
Loans Held for Sale	0	0
Mortgage Servicing Rights	0	0
Other Assets	31,871	29,230
Derivative Assets	0	0
Total Assets Measured at Fair Value on a Recurring Basis	32,843	29,768
Liabilities:
Derivative Liabilities	0	0
Total Liabilities Measured at Fair Value on a Recurring Basis	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Available-for-Sale	972	538
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Government-sponsored Enterprises Debt Securities [Member]
Assets:
Available-for-Sale	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Debt Securities Issued by Corporations
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-Backed Securities
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential - Government Agencies
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential - U.S. Government Sponsored Enterprises
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial - Government Agencies
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale	2,006,970	2,232,441
Loans Held for Sale	10,987	19,231
Mortgage Servicing Rights	0	0
Other Assets	0	0
Derivative Assets	812	146
Total Assets Measured at Fair Value on a Recurring Basis	2,018,769	2,251,818
Liabilities:
Derivative Liabilities	371	215
Total Liabilities Measured at Fair Value on a Recurring Basis	371	215
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Available-for-Sale	391,429	425,392
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale	563,996	627,019
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | US Government-sponsored Enterprises Debt Securities [Member]
Assets:
Available-for-Sale	56
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Corporations
Assets:
Available-for-Sale	223,140	266,111
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Mortgage-Backed Securities
Assets:
Available-for-Sale	828,349	913,919
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Residential - Government Agencies
Assets:
Available-for-Sale	190,442	235,360
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Residential - U.S. Government Sponsored Enterprises
Assets:
Available-for-Sale	578,527	609,812
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Commercial - Government Agencies
Assets:
Available-for-Sale	59,380	68,747
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3)
Assets:
Available-for-Sale	0	0
Loans Held for Sale	0	0
Mortgage Servicing Rights	1,290	1,454
Other Assets	0	0
Derivative Assets	13,792	10,372
Total Assets Measured at Fair Value on a Recurring Basis	15,082	11,826
Liabilities:
Derivative Liabilities	9,376	9,478
Total Liabilities Measured at Fair Value on a Recurring Basis	9,376	9,478
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) | US Government-sponsored Enterprises Debt Securities [Member]
Assets:
Available-for-Sale	0
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by Corporations
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) | Mortgage-Backed Securities
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) | Residential - Government Agencies
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) | Residential - U.S. Government Sponsored Enterprises
Assets:
Available-for-Sale	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) | Commercial - Government Agencies
Assets:
Available-for-Sale	$ 0	$ 0

Fair Value of Assets and Liab_4

Fair Value of Assets and Liabilities (FV on recurring basis-Level 3 rollforward) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Mortgage Servicing Rights Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Mortgage Servicing Rights, Beginning Balance	$ 1,454	$ 1,655
Fair Value, Mortgage Servicing Rights, Realized and Unrealized Net Gains (Losses) Included in Net Income	(164)	(201)
Fair Value, Mortgage Servicing Rights, Ending Balance	1,290	1,454
Fair Value, Mortgage Service Rights, Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Net Derivative Assets and Liabilities, Beginning Balance	894	1,053
Fair Value, Net Derivative Assets and Liabilities, Realized and Unrealized Net Gains (Losses) Included in Net Income	3,534	5,648
Fair Value, Net Derivative Assets and Liabilities, Transfers to Loans Held for Sale	(3,451)	(5,921)
Fair Value, Net Derivative Assets and Liabilities, Ending Balance	4,416	894
Fair Value, Net Derivative Assets and Liabilities,Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held	4,416	894
Variation margin payments for swap liabilities	$ 3,439	$ 114

Fair Value of Assets and Liab_5

Fair Value of Assets and Liabilities (FV on recurring or nonrecurring basis-level 3 inputs) (Details 3) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Interest Rate Lock Commitments | Pricing Model
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Weighted Average Closing Ratio (as a percent)	89.00%	93.25%
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	$ 871	$ 789
Interest Rate Swap Agreements | Discounted Cash Flow
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Weighted Average Credit Factor (as a percent)	0.0006	0.001
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	$ 3,545	$ 105
Mortgage Servicing Rights | Discounted Cash Flow
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Weighted Average Constant Prepayment Rate (as a percent)	7.01%	8.50%
Mortgage Servicing Rights, at Fair Value	$ 30,508	$ 28,170
Measurement Input, Discount Rate [Member] | Measurement Input, Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Servicing Asset, Measurement Input	0.0959	0.0887

Fair Value of Assets and Liab_6

Fair Value of Assets and Liabilities (FV option) (Details 5) - Residential Mortgage Loans Held For Sale - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value Option
Aggregate Fair Value	$ 10,987	$ 19,231
Aggregate Unpaid Principal	10,656	18,854
Aggregate Fair Value less Aggregate Unpaid Principal	$ 331	$ 377

Fair Value of Assets and Liab_7

Fair Value of Assets and Liabilities (Financial instruments not recorded at FV on recurring basis) (Details 6) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial Instruments - Assets
Held-to-Maturity, Fair Value	$ 3,413,994	$ 3,894,121	$ 3,827,527
Carrying Amount
Financial Instruments - Assets
Held-to-Maturity, Fair Value	3,482,092	3,928,170
Loans	10,084,527	9,436,506
Financial Instruments - Liabilities
Time Deposits	1,745,522	1,688,092
Securities Sold Under Agreements to Repurchase	504,296	505,293
Long-Term Debt	125,000	250,000
Fair value
Financial Instruments - Assets
Held-to-Maturity, Fair Value	3,413,994	3,894,121
Loans	10,008,417	9,519,369
Financial Instruments - Liabilities
Time Deposits	1,734,447	1,679,684
Securities Sold Under Agreements to Repurchase	504,288	505,278
Long-Term Debt	124,559	248,520
Fair value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Instruments - Assets
Held-to-Maturity, Fair Value	352,216	373,640
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Long-Term Debt	0	0
Fair value | Significant Other Observable Inputs (Level 2)
Financial Instruments - Assets
Held-to-Maturity, Fair Value	3,061,778	3,520,481
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	1,734,447	1,679,684
Securities Sold Under Agreements to Repurchase	504,288	505,278
Long-Term Debt	124,559	248,520
Fair value | Significant Other Unobservable Inputs (Level 3)
Financial Instruments - Assets
Held-to-Maturity, Fair Value	0	0
Loans	10,008,417	9,519,369
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Long-Term Debt	$ 0	$ 0

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Service Charges on Deposit Accounts	$ 28,811	$ 32,575	$ 33,654
Fees, Exchange, and Other Service Charges	57,482	54,845	55,176
Annuity and Insurance	5,822	6,858	7,017
Other	21,233	15,813	18,634
Noninterest Income	168,923	185,417	197,343
Accounting Standards Update 2014-09 [Member]
Noninterest Income	168,923	185,417	197,343
Accounting Standards Update 2014-09 [Member] | Noninterest Income In Scope of Topic 606 [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	43,877	45,430	46,203
Service Charges on Deposit Accounts	13,165	15,191	15,498
Fees, Exchange, and Other Service Charges	46,350	44,560	44,021
Annuity and Insurance	5,615	6,444	6,473
Other	9,652	8,966	8,795
Noninterest Income	118,659	120,591	120,990
Accounting Standards Update 2014-09 [Member] | Noninterest Income Out of Scope of Topic 606 [Member]
Noninterest Income	$ 50,264	$ 64,826	$ 76,353

Bank of Hawaii Corporation Fi_3

Bank of Hawaii Corporation Financial Statements (Condensed Statements of Comprehensive Income) (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Investment Securities Gains (Losses), Net	$ (3,938)	$ 10,430	$ 10,203
Noninterest Expense	371,624	357,691	350,578
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	270,226	268,064	259,594
Income Tax Expense (Benefit)	50,624	83,392	78,133
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	210,751	183,863	171,112
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries and Interest Income	185,000	130,000	120,000
Investment Securities Gains (Losses), Net	(819)	12,027	(340)
Other Income	198	204	279
Revenues	184,379	142,231	119,939
Intercompany Salaries and Services Expenses	734	720	705
Other Expenses	1,701	1,401	1,392
Noninterest Expense	2,435	2,121	2,097
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	181,944	140,110	117,842
Income Tax Expense (Benefit)	(2,229)	3,557	(2,137)
Equity in Net Assets of Subsidiaries	35,429	48,119	61,482
Net Income (Loss) Available to Common Stockholders, Basic	219,602	184,672	181,461
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 210,751	$ 183,863	$ 171,112

Bank of Hawaii Corporation Fi_4

Bank of Hawaii Corporation Financial Statements (Condensed Statements of Condition) (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Debt Securities, Held-to-maturity	$ 3,482,092	$ 3,928,170	$ 3,832,997
Goodwill	31,517	31,517
Other Assets	230,882	252,596
Total Assets	17,143,974	17,089,052	16,492,367
Other Liabilities	139,911	138,940
Liabilities	15,875,774	15,857,184
Stockholders' Equity Attributable to Parent	1,268,200	1,231,868	$ 1,161,537	$ 1,116,260
Liabilities and Equity	17,143,974	17,089,052
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash with Subsidiaries	52,731	49,669
Debt Securities, Held-to-maturity	4,999	4,986
Goodwill	14,129	14,129
Taxes Receivable and Deferred Taxes	1,520	2,567
Other Assets	8,468	8,233
Equity in Undistributed Income of Subsidiaries	1,195,132	1,161,037
Total Assets	1,276,979	1,240,621
Accrued Income Taxes	60	517
Other Liabilities	8,719	8,236
Liabilities	8,779	8,753
Stockholders' Equity Attributable to Parent	1,268,200	1,231,868
Liabilities and Equity	$ 1,276,979	$ 1,240,621

Bank of Hawaii Corporation Fi_5

Bank of Hawaii Corporation Financial Statements (Condensed Statements of Cash Flows) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Share-Based Compensation	$ 8,146	$ 7,369	$ 6,786
Net Losses (Gains) on Investment Securities	3,938	(10,430)	(10,203)
Net Change in Other Assets and Other Liabilities	27,815	(60,622)	1,760
Net Cash Provided by Operating Activities	317,922	175,145	226,529
Investing Activities
Purchase of Investment Securities Held-to-Maturity Securities	(419,640)	(995,076)	(677,652)
Net Cash Provided by (Used in) Investing Activities	(74,668)	(1,021,887)	(960,852)
Financing Activities
Repayments of Long-term Debt	175,000	0	50,000
Excess Tax Benefit from Share-based Compensation, Financing Activities	0	0	1,153
Proceeds from Issuance of Common Stock	7,873	13,101	9,079
Repurchase of Common Stock	(91,988)	(47,076)	(61,807)
Cash Dividends Paid	(98,496)	(87,066)	(81,157)
Net Cash Provided by (Used in) Financing Activities	(165,136)	414,986	858,209
Cash and Cash Equivalents at Beginning of Period	447,851	879,607	755,721
Cash and Cash Equivalents at End of Period	525,969	447,851	879,607
Parent Company [Member]
Operating Activities
Net Income	219,602	184,672	181,461
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Share-Based Compensation	630	573	558
Net Losses (Gains) on Investment Securities	819	(12,027)	340
Equity in Undistributed Income of Subsidiaries	(35,429)	(48,119)	(61,482)
Net Change in Other Assets and Other Liabilities	870	(6,477)	1,508
Net Cash Provided by Operating Activities	186,492	118,622	122,385
Investing Activities
Capital Contributions to the Bank	0	(12,467)	0
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	613	0
Proceeds from Sales of Investment Securities	819	(12,027)	340
Net Cash Provided by (Used in) Investing Activities	(819)	173	(340)
Financing Activities
Proceeds from Issuance of Common Stock	7,873	13,101	9,079
Repurchase of Common Stock	(91,988)	(47,076)	(61,807)
Cash Dividends Paid	(98,496)	(87,066)	(81,157)
Net Cash Provided by (Used in) Financing Activities	(182,611)	(121,041)	(133,885)
Net Change in Cash and Cash Equivalents	3,062	(2,246)	(11,840)
Cash and Cash Equivalents at Beginning of Period	49,669	51,915	63,755
Cash and Cash Equivalents at End of Period	$ 52,731	$ 49,669	$ 51,915