Northwest Bancshares (NWBI) 10-Q 8 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document and Entity Information
Entity Registrant Name	Northwest Bancshares, Inc.
Entity Central Index Key	1,471,265
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding (in shares)		103,300,768
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 73,946	$ 77,710
Marketable securities available-for-sale (amortized cost of $829,345 and $800,094)	811,556	792,535
Marketable securities held-to-maturity (fair value of $23,534 and $29,667)	24,222	29,678
Total cash and cash equivalents and marketable securities	909,724	899,923
Personal Banking loans:
Residential mortgage loans held-for-sale	0	3,128
Residential mortgage loans	2,846,834	2,773,075
Home equity loans	1,272,345	1,310,355
Consumer loans	776,049	671,389
Total Personal Banking loans	4,895,228	4,757,947
Commercial Banking loans:
Commercial real estate loans	2,518,066	2,454,726
Commercial loans	582,768	580,736
Total Commercial Banking loans	3,100,834	3,035,462
Total loans	7,996,062	7,793,409
Allowance for loan losses	(55,975)	(56,795)
Total loans, net	7,940,087	7,736,614
Federal Home Loan Bank stock, at cost	15,452	11,733
Accrued interest receivable	25,798	23,352
Real estate owned, net	2,486	5,666
Premises and equipment, net	144,612	151,944
Bank owned life insurance	170,042	171,547
Goodwill	307,420	307,420
Other intangible assets	21,167	25,669
Other assets	38,543	30,066
Total assets	9,575,331	9,363,934
Liabilities:
Noninterest-bearing checking deposits	1,724,202	1,610,409
Interest-bearing checking deposits	1,499,344	1,442,928
Money market deposit accounts	1,676,845	1,707,450
Savings deposits	1,650,357	1,653,579
Time deposits	1,403,205	1,412,623
Total deposits	7,953,953	7,826,989
Borrowed funds	179,117	108,238
Junior subordinated debentures	111,213	111,213
Advances by borrowers for taxes and insurance	23,297	40,825
Accrued interest payable	627	460
Other liabilities	66,448	68,485
Total liabilities	8,334,655	8,156,210
Shareholders’ equity:
Preferred stock, $0.01 par value: 50,000,000 authorized, no shares issued	0	0
Common stock, $0.01 par value: 500,000,000 shares authorized, 103,293,480 shares and 102,394,828 shares issued, respectively	1,033	1,027
Paid-in capital	742,863	730,719
Retained earnings	541,469	508,058
Accumulated other comprehensive loss	(44,689)	(32,080)
Total shareholders’ equity	1,240,676	1,207,724
Total liabilities and shareholders’ equity	$ 9,575,331	$ 9,363,934

CONSOLIDATED STATEMENTS OF FI_2

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Marketable securities available-for-sale, amortized cost	$ 829,345	$ 800,094
Marketable securities held-to-maturity, fair value	$ 23,534	$ 29,667
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	103,293,480	102,394,828

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income:
Loans receivable	$ 90,733	$ 85,373	$ 264,059	$ 252,838
Mortgage-backed securities	3,572	3,118	9,839	8,327
Taxable investment securities	814	957	2,140	2,944
Tax-free investment securities	205	476	908	1,574
FHLB dividends	119	63	301	172
Interest-earning deposits	162	244	766	1,440
Total interest income	95,605	90,231	278,013	267,295
Interest expense:
Deposits	8,233	5,795	22,000	17,086
Borrowed funds	1,555	1,199	4,203	3,664
Total interest expense	9,788	6,994	26,203	20,750
Net interest income	85,817	83,237	251,810	246,545
Provision for loan losses	6,982	3,027	16,540	13,226
Net interest income after provision for loan losses	78,835	80,210	235,270	233,319
Noninterest income:
Gain on sale of investments	0	1,497	153	1,517
Service charges and fees	13,158	12,724	37,965	37,190
Trust and other financial services income	4,254	4,793	12,335	13,697
Insurance commission income	2,046	1,992	6,885	7,139
Loss on real estate owned, net	(247)	(193)	(617)	(490)
Income from bank owned life insurance	1,460	1,078	4,783	3,798
Mortgage banking income	82	519	383	1,193
Gain on sale of offices	0	0	0	17,186
Other operating income	1,804	2,184	6,567	6,345
Total noninterest income	22,557	24,594	68,454	87,575
Noninterest expense:
Compensation and employee benefits	37,535	36,556	113,076	113,003
Premises and occupancy costs	6,821	6,951	20,952	21,570
Office operations	3,508	3,939	10,684	12,331
Collections expense	483	568	1,429	1,670
Processing expenses	9,620	9,650	28,886	29,198
Marketing expenses	1,949	2,488	6,103	7,482
Federal deposit insurance premiums	721	771	2,109	2,794
Professional services	2,368	2,321	7,464	7,348
Amortization of intangible assets	1,462	1,691	4,502	5,189
Real estate owned expense	205	310	630	809
Restructuring/ acquisition expense	186	1,398	579	4,255
Other expenses	1,759	2,156	7,411	8,058
Total noninterest expense	66,617	68,799	203,825	213,707
Income before income taxes	34,775	36,005	99,899	107,187
Federal and state income taxes expense	7,035	12,414	20,875	34,868
Net income	$ 27,740	$ 23,591	$ 79,024	$ 72,319
Basic earnings per share (in dollars per share)	$ 0.27	$ 0.23	$ 0.78	$ 0.72
Diluted earnings per share (in dollars per share)	$ 0.27	$ 0.23	$ 0.76	$ 0.71

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 27,740	$ 23,591	$ 79,024	$ 72,319
Net unrealized holding gains/ (losses) on marketable securities:
Unrealized holding gains/ (losses) net of tax of $788, $164, $2,869, and $(995), respectively	(1,970)	(264)	(7,169)	1,684
Reclassification adjustment for gains included in net income, net of tax of $17, $369, $54 and $416, respectively	(44)	(674)	(138)	(741)
Net unrealized holding gains/ (losses) on marketable securities	(2,014)	(938)	(7,307)	943
Change in fair value of interest rate swaps, net of tax of $(51), $(138), $(204), and $(419), respectively	192	258	766	779
Defined benefit plan:
Reclassification adjustments for prior period service costs and net losses included in net income, net of tax of $(90), $(153), $(271) and $(460), respectively	226	221	678	662
Other comprehensive income/ (loss)	(1,596)	(459)	(5,863)	2,384
Total comprehensive income	$ 26,144	$ 23,132	$ 73,161	$ 74,703

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Unrealized holding losses, tax	$ 788	$ 164	$ 2,869	$ (995)
Reclassification adjustment for gains included in net income, tax	17	369	54	416
Change in fair value of interest rate swaps, tax	(51)	(138)	(204)	(419)
Reclassification adjustments for prior period service costs and net losses included in net income, tax	$ (90)	$ (153)	$ (271)	$ (460)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance beginning of the period (in shares) at Dec. 31, 2016		101,699,406
Balance beginning of the period at Dec. 31, 2016	$ 1,170,663	$ 1,017	$ 718,834	$ 478,803	$ (27,991)
Comprehensive income:
Net income	72,319			72,319
Other comprehensive income, net	2,384				2,384
Total comprehensive income	74,703			72,319	2,384
Exercise of stock options (in shares)		488,211
Exercise of stock options	5,616	$ 5	5,611
Stock-based compensation expense (in shares)		378,050
Stock-based compensation expense, including tax benefit	3,722	$ 4	3,718
Dividends paid, per share amount	(48,857)			(48,857)
Balance end of period (in shares) at Sep. 30, 2017		102,565,667
Balance end of the period at Sep. 30, 2017	1,205,847	$ 1,026	728,163	502,265	(25,607)
Balance beginning of the period (in shares) at Jun. 30, 2017		102,478,146
Balance beginning of the period at Jun. 30, 2017	1,196,930	$ 1,025	726,036	495,017	(25,148)
Comprehensive income:
Net income	23,591			23,591
Other comprehensive income, net	(459)				(459)
Total comprehensive income	23,132			23,591	(459)
Exercise of stock options (in shares)		87,521
Exercise of stock options	1,034	$ 1	1,033
Stock-based compensation expense (in shares)		0
Stock-based compensation expense, including tax benefit	1,094	$ 0	1,094
Dividends paid, per share amount	(16,343)			(16,343)
Balance end of period (in shares) at Sep. 30, 2017		102,565,667
Balance end of the period at Sep. 30, 2017	1,205,847	$ 1,026	728,163	502,265	(25,607)
Balance beginning of the period (in shares) at Dec. 31, 2017		102,394,828
Balance beginning of the period at Dec. 31, 2017	1,207,724	$ 1,027	730,719	508,058	(32,080)
Increase (Decrease) in Stockholders' Equity
Reclassification due to adoption of ASU No. 2018-02				6,746	(6,746)
Comprehensive income:
Net income	79,024			79,024
Other comprehensive income, net	(5,863)				(5,863)
Total comprehensive income	73,161			85,770	(12,609)
Exercise of stock options (in shares)		674,538
Exercise of stock options	7,602	$ 7	7,595
Stock-based compensation expense (in shares)		414,330
Stock-based compensation expense, including tax benefit	4,548	$ 4	4,544
Stock-based compensation forfeited (in shares)		(190,216)
Stock-based compensation forfeited	0	$ (5)	5
Dividends paid, per share amount	(52,359)			(52,359)
Balance end of period (in shares) at Sep. 30, 2018		103,293,480
Balance end of the period at Sep. 30, 2018	1,240,676	$ 1,033	742,863	541,469	(44,689)
Balance beginning of the period (in shares) at Jun. 30, 2018		103,122,890
Balance beginning of the period at Jun. 30, 2018	1,228,880	$ 1,031	739,673	531,269	(43,093)
Increase (Decrease) in Stockholders' Equity
Reclassification due to adoption of ASU No. 2018-02	(6,700)
Comprehensive income:
Net income	27,740			27,740
Other comprehensive income, net	(1,596)				(1,596)
Total comprehensive income	26,144			27,740	(1,596)
Exercise of stock options (in shares)		178,109
Exercise of stock options	1,920	$ 2	1,918
Stock-based compensation expense (in shares)		0
Stock-based compensation expense, including tax benefit	$ 1,272	$ 0	1,272
Stock-based compensation forfeited (in shares)	(7,519)
Stock-based compensation forfeited	$ 0	$ 0	0
Dividends paid, per share amount	(17,540)			(17,540)
Balance end of period (in shares) at Sep. 30, 2018		103,293,480
Balance end of the period at Sep. 30, 2018	$ 1,240,676	$ 1,033	$ 742,863	$ 541,469	$ (44,689)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Other comprehensive income, tax	$ 664	$ 242	$ 2,448	$ (1,458)
Dividends paid, per share (in dollars per share)	$ 0.17	$ 0.16	$ 0.51	$ 0.48

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES:
Net income	$ 79,024	$ 72,319
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	16,540	13,226
Net (gain)/ loss on sale of assets	1,758	(1,443)
Net gain on sale of offices	0	(17,186)
Net depreciation, amortization and accretion	7,598	10,951
(Increase)/ decrease in other assets	(8,952)	20,968
Decrease in other liabilities	48	1,761
Net amortization on marketable securities	1,317	1,535
Noncash write-down of real estate owned	1,281	980
Deferred income tax expense	22	0
Origination of loans held for sale	(1,297)	(59,401)
Proceeds from sale of loans held for sale	4,501	68,041
Noncash compensation expense related to stock benefit plans	4,548	3,722
Net cash provided by operating activities	106,388	115,473
INVESTING ACTIVITIES:
Purchase of marketable securities held-to-maturity	0	(23,621)
Purchase of marketable securities available-for-sale	(215,242)	(210,111)
Proceeds from maturities and principal reductions of marketable securities held-to-maturity	5,439	11,625
Proceeds from maturities and principal reductions of marketable securities available-for-sale	179,640	144,846
Proceeds from sale of marketable securities available-for-sale	5,206	23,501
Proceeds from bank-owed life insurance	357	1,550
Loan originations	(2,256,146)	(2,050,885)
Proceeds from loan maturities and principal reductions	2,036,656	2,002,816
Net purchase of Federal Home Loan Bank stock	(3,719)	(594)
Proceeds from sale of real estate owned	5,082	3,687
Sale of real estate owned for investment, net	455	456
Purchase of premises and equipment	(3,438)	(1,242)
Net cash used in investing activities	(245,710)	(97,972)
FINANCING ACTIVITIES:
Increase/ (decrease) in deposits, net	126,964	(155,925)
Net increase/ (decrease) in short-term borrowings	70,879	(27,511)
Decrease in advances by borrowers for taxes and insurance	(17,528)	(15,015)
Cash dividends paid	(52,359)	(48,857)
Proceeds from stock options exercised	7,602	5,616
Net cash provided by/ (used in) financing activities	135,558	(241,692)
Net decrease in cash and cash equivalents	(3,764)	(224,191)
Cash and cash equivalents at beginning of period	77,710	389,867
Net decrease in cash and cash equivalents	(3,764)	(224,191)
Cash and cash equivalents at end of period	73,946	165,676
Cash paid during the period for:
Interest on deposits and borrowings (including interest credited to deposit accounts of $20,927 and $16,644, respectively)	26,036	20,875
Income taxes	19,299	20,705
Non-cash activities:
Loan foreclosures and repossessions	5,034	6,392
Sale of real estate owned financed by the Company	$ 183	$ 168

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Cash Flows [Abstract]
Interest on deposits and borrowings, interest credited to deposit accounts	$ 20,927	$ 16,644

Basis of Presentation and Infor

Basis of Presentation and Informational Disclosures	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Informational Disclosures	Basis of Presentation and Informational Disclosures Northwest Bancshares, Inc. (the “Company”) or (“NWBI”), a Maryland corporation headquartered in Warren, Pennsylvania, is a savings and loan holding company regulated by the Board of Governors of the Federal Reserve System. The primary activity of the Company is the ownership of all of the issued and outstanding common stock of Northwest Bank, a Pennsylvania-chartered savings bank (“Northwest”). Northwest is regulated by the FDIC and the Pennsylvania Department of Banking. Northwest operates 172 community-banking offices throughout Pennsylvania, western New York, and eastern Ohio. The accompanying unaudited consolidated financial statements include the accounts of the Company and its subsidiary, Northwest, and Northwest’s subsidiaries Northwest Capital Group, Inc., Allegheny Services, Inc., Great Northwest Corporation, and The Bert Company. The unaudited consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information or footnotes required for complete annual financial statements. In the opinion of management, all adjustments necessary for the fair presentation of the Company’s financial position and results of operations have been included. The consolidated statements have been prepared using the accounting policies described in the financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 updated, as required, for any new pronouncements or changes. Certain items previously reported have been reclassified to conform to the current year's reporting format. The results of operations for the quarter and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 , or any other period. Stock-Based Compensation On May 14, 2018, the Company awarded employees 831,160 stock options and directors 64,800 stock options with an exercise price of $16.59 and grant date fair value of $1.49 per stock option, and the Company awarded employees 390,030 restricted common shares and directors 24,300 restricted common shares with a grant date fair value of $16.59 . Awarded stock options and common shares vest over a seven -year period with the first vesting occurring on the grant date. Stock-based compensation expense of $1.3 million and $1.1 million for the quarters ended September 30, 2018 and 2017 , and $4.5 million and $3.7 million for the nine months ended September 30, 2018 and 2017 , respectively, was recognized in compensation expense relating to our stock benefit plans. At September 30, 2018 there was compensation expense of $4.3 million to be recognized for awarded but unvested stock options and $18.6 million for unvested common shares. Income Taxes- Uncertain Tax Positions Accounting standards prescribe a comprehensive model for how a company should recognize, measure, present and disclose in its financial statements uncertain tax positions that the company has taken or expects to take on a tax return. A tax benefit from an uncertain position may be recognized only if it is “more likely than not” that the position is sustainable, based on its technical merits. The tax benefit of a qualifying position is the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement with a taxing authority having full knowledge of all relevant information. At September 30, 2018 we had no liability for unrecognized tax benefits. We recognize interest accrued related to: (1) unrecognized tax benefits in other expenses and (2) refund claims in other operating income. We recognize penalties (if any) in other expenses. We are subject to audit by the Internal Revenue Service and any state in which we conduct business for the tax periods ended December 31, 2017 , 2016 and 2015 . Recently Adopted Accounting Standards In May 2014 the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “ Revenue from Contracts with Customers (Topic 606) ”. Effective January 1, 2018, we adopted the ASU and all related amendments to all contracts using the modified retrospective approach, with the cumulative effect recorded as an adjustment to opening retained earnings. Due to immateriality, we had no cumulative effect to record. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. We expect the impact of the adoption of the new standard to be immaterial to our net income on an ongoing basis. Our revenue is comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and non-interest income. The services that fall within the scope of ASC 606 include service charges and fees, trust and other financial services income, insurance commission income, sale of OREO and other operating income. Revenue is recognized when performance obligations under the terms of a contract with our customers are satisfied. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. The majority of our revenue continues to be recognized at the point in time when the services are provided to our customers. Service charges and fees represents income earned on both loan and deposit accounts as well as interchange income. Service charges on deposit accounts primarily consist of overdraft, non-sufficient funds, ATM transaction fees and account management fees. Revenue is recognized at the point in time the transaction occurs or the service is provided to the customer. We earn interchange income from debit and credit cardholder transactions processed through payment networks. Interchange fees represent a percentage of the underlying transaction value and are generally set by the credit card associations. Interchange fees are recognized as transactions occur. We provide trust management services and investment management services to our customers and recognize revenue as these management services are provided. Trust and investment management services are billed and paid on a monthly or quarterly basis. Additionally, we earn commissions on investment products that are sold to our customers. These commissions are recognized at the time of the sale of the third party’s product or services to our customers. Our insurance subsidiary is an employee benefits and property and casualty insurance agency specializing in commercial and personal insurance as well as retirement benefit plans. Insurance commission income is earned at the time of sale of the third party’s product or service to our customers. Loss on real estate owned represents gains and losses on real estate acquired by Northwest through the foreclosure process. Proceeds from the sale of these properties are recognized when control of the property transfers to the buyer. In certain instances the Bank may finance a portion of the purchase price paid by the buyer and an additional evaluation of whether all of the contract criteria are met is required. If it is not probable that we will collect substantially all of the consideration expected, the transaction would not be accounted for as a sale until the concerns about collectability are resolved. Other operating income consists primarily of revenues earned for providing transaction services to our deposit customers. The revenue is earned at the point in time the transaction occurs. We have evaluated the nature of our contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Statements of Income was not necessary. In January 2016 the FASB issued ASU 2016-01, “Financial Instruments - Overall (Subtopic 825-10)” . This guidance requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. This guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. We adopted this guidance as of January 1, 2018 which did not have a material impact on our results of operations and financial position. Additionally, this guidance requires entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. Accordingly, we refined the calculation used to determine the disclosed fair value of our loans held for investment portfolio as part of adopting this standard. The refined calculation did not have a significant impact on our fair value disclosures. Refer to note 9, "Disclosures About Fair Value of Financial Instruments". In August 2016, the FASB issued ASU No. 2016-15, “ Classification of Certain Cash Receipts and Cash Payments ”. The main objective of this ASU is to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The amendments in this Update provide guidance on the following eight specific cash flow issues: debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of bank-owned life insurance (BOLI) policies, distributions received from equity method investments, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. This guidance is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. We adopted this guidance as of January 1, 2018 and applied it on a retrospective basis. No material reclassifications were made for the nine months ended September 30, 2017 and we do not expect the reclassifications to be material for the full year. In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment" . This guidance eliminates the requirement to determine the fair value of individual assets and liabilities of a reporting unit to measure goodwill impairment. Under this guidance goodwill impairment testing will be performed by comparing the fair value of the reporting unit with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value. This guidance is effective for annual and interim goodwill impairment tests in fiscal years beginning after December 15, 2019, and should be applied on a prospective basis. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017.We have elected to early adopt this standard as of January 1, 2018 and the amendments were applied on a prospective basis. The adoption did not have a material impact on the consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-07, “Compensation Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Costs and Net Periodic Postretirement Benefit Costs ". This guidance provides financial statement users with clearer and disaggregated information related to the components of net periodic benefit cost and improve transparency of the presentation of net periodic benefit cost in the financial statements. Employers will present the service cost component of net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. Employers will present the other components of the net periodic benefit cost separately from the line items that includes the service cost outside of any subtotal of operating income, if one is presented. This guidance is effective for annual and interim periods beginning after December 15, 2017 and should be applied retrospectively. We adopted this standard as of January 1, 2018. The other components of the net periodic benefit cost for the quarter and nine months ended September 30, 2017 totaled $517,000 and $1.6 million , respectively, and were reclassified from compensation and employee benefits to other expense. In February 2018, the FASB issued ASU 2018-02, " Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income." This guidance permits a reclassification from accumulated other comprehensive income to retained earnings of the stranded tax effects resulting from the Tax Cuts and Jobs Act. This guidance is effective for annual or interim reporting periods beginning after December 15, 2018 but permits early adoption in a period for which financial statements have not been issued. We have elected to early adopt the ASU as of January 1, 2018. The reclassification from accumulated other comprehensive income to retained earnings was $6.7 million for the release of stranded income tax benefits relating to the unrealized net gains and losses on available for sale securities and the change in fair value of our interest rate swaps and our pension plan. Our policy for releasing income tax effects from accumulated other comprehensive income is to release them when investments are sold or matured and liabilities are extinguished. Recently Issued Accounting Standards In February 2016, the FASB issued ASU 2016-2, “Leases” . This guidance requires a lessee to recognize in the statement of financial condition a liability to make lease payments and a right-of-use asset representing the right to use the underlying asset for the term of the lease. Optional periods should only be recognized if the lessee is reasonably certain to exercise the option. For leases with a term of twelve months or less, the lessee is permitted not to recognize lease assets and lease liabilities and should recognize lease expense for such leases generally on a straight-line basis over the term of the lease. This guidance is effective for annual periods beginning after December 15, 2018, including interim periods within those years and early adoption is permitted. We lease certain branch and office facilities or land under operating leases. While we are currently evaluating the impact this guidance will have on our results of operations and financial position, we expect the primary impact on the consolidated statement of financial position will be the recognition of right-of-use assets and lease obligations under the ASU as a result of our minimum commitments under non-cancellable operating leases. Our current minimum commitments under non-cancellable operating leases are disclosed in Note 7, “Premises and Equipment” in our Annual Report on Form 10-K for the year ended December 31, 2017. We expect to apply the package of practical expedients included therein, as well as utilize the transition method included in ASU 2018-11. By applying ASU 2016-02 at the adoption date, as opposed to at the beginning of the earliest period presented, our reporting for periods prior to January 1, 2019 will continue to be in accordance with Leases (Topic 840) . In June 2016, the FASB issued ASU 2016-13, " Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments" , which eliminates the probable initial recognition threshold for credit losses and instead requires that all financial assets (or group of financial assets) measured at amortized cost be presented at the net amount expected to be collected inclusive of the entity’s current estimate of all lifetime expected credit losses. This guidance also applies to certain off-balance-sheet credit exposures such as unfunded commitments and non-derivative financial guarantees. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial assets in order to present the net carrying value at the amount expected to be collected on the financial asset. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The income statement under this guidance will reflect the initial recognition of current expected credit losses for newly recognized assets, as well as any increases or decreases of expected credit losses that have occurred during the period. This guidance retains many currently-existing disclosures related to the credit quality of an entity’s assets and the related allowance for credit losses amended to reflect the change to an expected credit loss methodology, as well as enhanced disclosures to provide information to users at a more disaggregated level. Upon adoption, ASU 2016-13 provides for a modified retrospective transition by means of a cumulative-effect adjustment to equity as of the beginning of the period in which the guidance is effective, except for debt securities for which other-than-temporary impairment has previously been recognized. For these debt securities, a prospective transition is provided in order to maintain the same amortized cost prior to and subsequent to the effective date of the ASU. This guidance is effective for annual reporting periods beginning after December 15, 2019, and interim periods within those annual periods with early adoption permitted for fiscal years beginning after December 15, 2018, and interim periods within those annual periods. Management created a formal working group to govern the implementation of these amendments consisting of key stakeholders from finance, risk, credit and accounting. We are currently in the process of designing current expected credit loss estimation methodologies and systems, and collecting data to be able to comply with the standard. We have partnered with a third-party to assist in the development of certain portfolio-level estimation methodologies and have chosen a third-party software platform provider. We are also evaluating the effect this guidance will have on our results of operations, financial position and related disclosures. The impact of the ASU will depend upon the state of the economy and the nature of our portfolios, among other items, at the date of adoption. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820) - Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement.” This guidance removes, modifies and adds disclosure requirements for fair value measurements. This guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those years, with early adoption permitted for any removed or modified disclosure requirements. Transition is on a prospective basis for the new and modified disclosures, and on a retrospective basis for disclosures that have been eliminated. We do not expect this guidance to have a material impact on our financial statements. In August 2018, the FASB issued ASU 2018-14, “ Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20) - Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans.” This guidance removes and adds disclosure requirements for defined benefit pension or other post-retirement plans. This guidance is effective for annual periods beginning after December 15, 2020, with early adoption permitted, and requires retrospective adoption for all periods presented. We do not expect this guidance to have a material impact on our financial statements. In August 2018, the FASB issued ASU 2018-15, “ Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40)-Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” This guidance aligns the requirements for capitalization of implementation costs incurred in a hosting arrangement that is a service contract with the existing guidance for internal-use software. This guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those years, with early adoption permitted. Transition can either be on a retrospective basis or a prospective basis on all implementation costs incurred after the date of adoption. We are evaluating the impact this new accounting guidance will have on our financial statements.

Investment securities and impai

Investment securities and impairment of investment securities	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investment securities and impairment of investment securities	Investment securities and impairment of investment securities The following table shows the portfolio of investment securities available-for-sale at September 30, 2018 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Debt issued by the U.S. government and agencies: Due after one year through five years $ 14,707 — (12 ) 14,695 Debt issued by government sponsored enterprises: Due in one year or less 70,096 — (895 ) 69,201 Due after one year through five years 116,097 — (2,560 ) 113,537 Due after ten years 3,822 — (115 ) 3,707 Municipal securities: Due in one year or less 2,351 3 (7 ) 2,347 Due after one year through five years 3,553 43 (11 ) 3,585 Due after five years through ten years 11,714 46 (23 ) 11,737 Due after ten years 7,073 31 (29 ) 7,075 Corporate debt issues: Due after five years through ten years 912 — — 912 Residential mortgage-backed securities: Fixed rate pass-through 131,255 514 (5,689 ) 126,080 Variable rate pass-through 26,374 1,064 (5 ) 27,433 Fixed rate non-agency CMOs — — — — Fixed rate agency CMOs 374,900 5 (10,595 ) 364,310 Variable rate agency CMOs 66,491 467 (21 ) 66,937 Total residential mortgage-backed securities 599,020 2,050 (16,310 ) 584,760 Total marketable securities available-for-sale $ 829,345 2,173 (19,962 ) 811,556 The following table shows the portfolio of investment securities available-for-sale at December 31, 2017 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Debt issued by the U.S. government and agencies: Due in one year or less $ 1 — — 1 Debt issued by government sponsored enterprises: Due in one year or less 66,566 14 (289 ) 66,291 Due after one year through five years 140,624 — (2,402 ) 138,222 Due after ten years 4,833 — (77 ) 4,756 Equity securities 551 29 (6 ) 574 Municipal securities: Due in one year or less 2,492 7 (1 ) 2,498 Due after one year through five years 7,072 82 (6 ) 7,148 Due after five years through ten years 14,576 171 — 14,747 Due after ten years 26,371 292 — 26,663 Corporate debt issues: Due after ten years 909 — — 909 Residential mortgage-backed securities: Fixed rate pass-through 144,411 1,108 (2,817 ) 142,702 Variable rate pass-through 33,079 1,464 (6 ) 34,537 Fixed rate non-agency CMOs 15 — — 15 Fixed rate agency CMOs 284,320 37 (5,271 ) 279,086 Variable rate agency CMOs 74,274 249 (137 ) 74,386 Total residential mortgage-backed securities 536,099 2,858 (8,231 ) 530,726 Total marketable securities available-for-sale $ 800,094 3,453 (11,012 ) 792,535 The following table shows the portfolio of investment securities held-to-maturity at September 30, 2018 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through $ 3,027 44 — 3,071 Variable rate pass-through 1,778 39 — 1,817 Fixed rate agency CMOs 18,753 — (782 ) 17,971 Variable rate agency CMOs 664 11 — 675 Total residential mortgage-backed securities 24,222 94 (782 ) 23,534 Total marketable securities held-to-maturity $ 24,222 94 (782 ) 23,534 The following table shows the portfolio of investment securities held-to-maturity at December 31, 2017 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through $ 3,760 140 — 3,900 Variable rate pass-through 2,283 64 — 2,347 Fixed rate agency CMOs 22,906 20 (248 ) 22,678 Variable rate agency CMOs 729 13 — 742 Total residential mortgage-backed securities 29,678 237 (248 ) 29,667 Total marketable securities held-to-maturity $ 29,678 237 (248 ) 29,667 The following table shows the fair value of and gross unrealized losses on investment securities, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position at September 30, 2018 (in thousands): Less than 12 months 12 months or more Total Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss U.S. government sponsored enterprises $ 55,650 (210 ) 130,795 (3,360 ) 186,445 (3,570 ) Municipal securities 9,025 (70 ) — — 9,025 (70 ) Residential mortgage-backed securities - agency 176,316 (2,095 ) 329,287 (14,997 ) 505,603 (17,092 ) U.S. government and agencies 14,695 (12 ) — — 14,695 (12 ) Total temporarily impaired securities $ 255,686 (2,387 ) 460,082 (18,357 ) 715,768 (20,744 ) The following table shows the fair value of and gross unrealized losses on investment securities, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position at December 31, 2017 (in thousands): Less than 12 months 12 months or more Total Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss U.S. government sponsored enterprises $ 5,006 (7 ) 197,695 (2,761 ) 202,701 (2,768 ) Equity Securities — — 544 (6 ) 544 (6 ) Municipal Securities 4,563 (7 ) — — 4,563 (7 ) Residential mortgage-backed securities - agency 239,703 (2,522 ) 202,344 (5,957 ) 442,047 (8,479 ) Total temporarily impaired securities $ 249,272 (2,536 ) 400,583 (8,724 ) 649,855 (11,260 ) We review our investment portfolio for indications of impairment. This review includes analyzing the length of time and the extent to which amortized costs have exceeded fair values, the financial condition and near-term prospects of the issuer, including any specific events which may influence the operations of the issuer, and the intent and ability to hold the investments for a period of time sufficient to allow for a recovery in value. We do not have the intent to sell these securities and it is more likely than not that we will not have to sell these securities before a recovery of our cost basis. For these reasons, we consider the unrealized losses to be temporary impairment losses. Credit related impairment on all debt securities is recognized in earnings while noncredit related impairment on available-for-sale debt securities, not expected to be sold, is recognized in other comprehensive income. The table below shows a cumulative roll forward of credit losses recognized in earnings for debt securities held and not intended to be sold for the quarter and nine months ended September 30, : 2018 2017 Beginning balance at July 1, (1) $ — 7,942 Credit losses on debt securities for which other-than-temporary impairment was not previously recognized — — Reduction for securities sold/ called realized during the quarter — — Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized — — Ending balance at September 30, $ — 7,942 2018 2017 Beginning balance at January 1, (1) $ 352 7,942 Credit losses on debt securities for which other-than-temporary impairment was not previously recognized — — Reduction for losses realized during the quarter (352 ) — Reduction for securities sold/ called realized during the nine months — — Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized — — Ending balance at September 30, $ — 7,942 (1) The beginning balance represents credit losses included in other-than-temporary impairment charges recognized on debt securities in prior periods.

Loans receivable

Loans receivable	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Loans receivable	Loans receivable The following table shows a summary of our loans receivable at September 30, 2018 and December 31, 2017 (in thousands): September 30, December 31, Originated Acquired Total Originated Acquired Total Personal Banking: Residential mortgage loans (1) $ 2,745,190 97,822 2,843,012 2,658,726 113,823 2,772,549 Home equity loans 1,048,373 223,972 1,272,345 1,051,558 258,797 1,310,355 Consumer finance loans (2) 5,888 — 5,888 18,619 — 18,619 Consumer loans 685,252 66,284 751,536 540,832 97,877 638,709 Total Personal Banking 4,484,703 388,078 4,872,781 4,269,735 470,497 4,740,232 Commercial Banking: Commercial real estate loans 2,477,581 241,307 2,718,888 2,303,179 296,161 2,599,340 Commercial loans 594,939 51,164 646,103 572,341 60,822 633,163 Total Commercial Banking 3,072,520 292,471 3,364,991 2,875,520 356,983 3,232,503 Total loans receivable, gross 7,557,223 680,549 8,237,772 7,145,255 827,480 7,972,735 Deferred loan costs 32,846 936 33,782 26,255 1,527 27,782 Allowance for loan losses (51,473 ) (4,502 ) (55,975 ) (50,572 ) (6,223 ) (56,795 ) Undisbursed loan proceeds: Residential mortgage loans (11,335 ) — (11,335 ) (10,067 ) — (10,067 ) Commercial real estate loans (200,152 ) (670 ) (200,822 ) (141,967 ) (2,647 ) (144,614 ) Commercial loans (62,175 ) (1,160 ) (63,335 ) (51,143 ) (1,284 ) (52,427 ) Total loans receivable, net $ 7,264,934 675,153 7,940,087 6,917,761 818,853 7,736,614 (1) Includes $0 and $3.1 million of loans held for sale at September 30, 2018 and December 31, 2017 , respectively. (2) Represents loans from our consumer finance subsidiary that was closed in 2017, which are no longer being originated. Acquired loans were initially measured at fair value and subsequently accounted for under either Accounting Standards Codification (“ASC”) Topic 310-30 or ASC Topic 310-20. The following table provides information related to the outstanding principal balance and related carrying value of acquired loans for the dates indicated (in thousands): September 30, December 31, Acquired loans evaluated individually for future credit losses: Outstanding principal balance $ 8,446 9,735 Carrying value 5,871 6,875 Acquired loans evaluated collectively for future credit losses: Outstanding principal balance 678,540 824,205 Carrying value 673,784 818,201 Total acquired loans: Outstanding principal balance 686,986 833,940 Carrying value 679,655 825,076 The following table provides information related to the changes in the accretable discount, which includes income recognized from contractual cash flows for the dates indicated (in thousands): Total Balance at December 31, 2016 $ 2,187 Accretion (1,318 ) Net reclassification from nonaccretable yield 671 Balance at December 31, 2017 1,540 Accretion (588 ) Net reclassification from nonaccretable yield — Balance at September 30, 2018 $ 952 The following table provides information related to acquired impaired loans by portfolio segment and by class of financing receivable at and for the nine months ended September 30, 2018 (in thousands): Carrying value Outstanding principal balance Related impairment reserve Average recorded investment in impaired loans Interest income recognized Personal Banking: Residential mortgage loans $ 1,099 1,741 13 1,140 135 Home equity loans 1,019 1,977 7 1,081 127 Consumer loans 32 95 4 46 31 Total Personal Banking 2,150 3,813 24 2,267 293 Commercial Banking: Commercial real estate loans 3,643 4,548 1 4,015 287 Commercial loans 78 85 — 91 8 Total Commercial Banking 3,721 4,633 1 4,106 295 Total $ 5,871 8,446 25 6,373 588 The following table provides information related to acquired impaired loans by portfolio segment and by class of financing receivable at and for the year ended December 31, 2017 (in thousands): Carrying Outstanding Related Average Interest Personal Banking: Residential mortgage loans $ 1,182 1,880 24 1,251 181 Home equity loans 1,143 2,219 21 1,253 157 Consumer loans 59 160 4 97 51 Total Personal Banking 2,384 4,259 49 2,601 389 Commercial Banking: Commercial real estate loans 4,388 5,363 39 6,992 914 Commercial loans 103 113 — 177 15 Total Commercial Banking 4,491 5,476 39 7,169 929 Total $ 6,875 9,735 88 9,770 1,318 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the quarter ended September 30, 2018 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 4,144 491 (204 ) 200 3,657 Home equity loans 3,234 (351 ) (323 ) 69 3,839 Consumer finance loans 1,650 (437 ) (445 ) 178 2,354 Consumer loans 11,021 4,023 (3,392 ) 630 9,760 Total Personal Banking 20,049 3,726 (4,364 ) 1,077 19,610 Commercial Banking: Commercial real estate loans 25,694 8,723 (4,820 ) 772 21,019 Commercial loans 5,730 (3,945 ) (914 ) 80 10,509 Total Commercial Banking 31,424 4,778 (5,734 ) 852 31,528 Total originated loans 51,473 8,504 (10,098 ) 1,929 51,138 Acquired loans: Personal Banking: Residential mortgage loans 102 (70 ) (10 ) 12 170 Home equity loans 408 (173 ) (103 ) 22 662 Consumer loans 444 (448 ) (78 ) 55 915 Total Personal Banking 954 (691 ) (191 ) 89 1,747 Commercial Banking: Commercial real estate loans 2,876 (532 ) (39 ) 25 3,422 Commercial loans 672 (299 ) (71 ) 17 1,025 Total Commercial Banking 3,548 (831 ) (110 ) 42 4,447 Total acquired loans 4,502 (1,522 ) (301 ) 131 6,194 Total $ 55,975 6,982 (10,399 ) 2,060 57,332 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the quarter ended September 30, 2017 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 3,986 (462 ) (211 ) 24 4,635 Home equity loans 3,295 615 (285 ) 8 2,957 Consumer finance loans 4,876 4,220 (3,891 ) 80 4,467 Consumer loans 7,383 4,594 (2,844 ) 353 5,280 Total Personal Banking 19,540 8,967 (7,231 ) 465 17,339 Commercial Banking: Commercial real estate loans 20,174 (2,529 ) (163 ) 282 22,584 Commercial loans 11,131 (5,445 ) (204 ) 76 16,704 Total Commercial Banking 31,305 (7,974 ) (367 ) 358 39,288 Total originated loans 50,845 993 (7,598 ) 823 56,627 Acquired loans: Personal Banking: Residential mortgage loans 77 (11 ) (4 ) 7 85 Home equity loans 748 324 (243 ) 44 623 Consumer loans 594 106 (158 ) 18 628 Total Personal Banking 1,419 419 (405 ) 69 1,336 Commercial Banking: Commercial real estate loans 3,301 2,433 (1,738 ) 160 2,446 Commercial loans 1,362 (818 ) (305 ) 9 2,476 Total Commercial Banking 4,663 1,615 (2,043 ) 169 4,922 Total acquired loans 6,082 2,034 (2,448 ) 238 6,258 Total $ 56,927 3,027 (10,046 ) 1,061 62,885 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the nine months ended September 30, 2018 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 4,144 678 (710 ) 352 3,824 Home equity loans 3,234 (164 ) (866 ) 192 4,072 Consumer finance loans 1,650 (469 ) (2,484 ) 635 3,968 Other consumer loans 11,021 9,845 (9,192 ) 1,893 8,475 Total Personal Banking 20,049 9,890 (13,252 ) 3,072 20,339 Commercial Banking: Commercial real estate loans 25,694 10,417 (5,702 ) 1,068 19,911 Commercial loans 5,730 (2,912 ) (2,053 ) 373 10,322 Total Commercial Banking 31,424 7,505 (7,755 ) 1,441 30,233 Total originated loans 51,473 17,395 (21,007 ) 4,513 50,572 Acquired loans: Personal Banking: Residential mortgage loans 102 (38 ) (94 ) 103 131 Home equity loans 408 85 (578 ) 139 762 Other consumer loans 444 (363 ) (209 ) 126 890 Total Personal Banking 954 (316 ) (881 ) 368 1,783 Commercial Banking: Commercial real estate loans 2,876 (688 ) (147 ) 162 3,549 Commercial loans 672 149 (448 ) 80 891 Total Commercial Banking 3,548 (539 ) (595 ) 242 4,440 Total acquired loans 4,502 (855 ) (1,476 ) 610 6,223 Total $ 55,975 16,540 (22,483 ) 5,123 56,795 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the nine months ended September 30, 2017 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 3,986 (278 ) (678 ) 286 4,656 Home equity loans 3,295 503 (803 ) 109 3,486 Consumer finance loans 4,876 6,610 (5,469 ) 290 3,445 Other consumer loans 7,383 9,741 (7,912 ) 1,025 4,529 Total Personal Banking 19,540 16,576 (14,862 ) 1,710 16,116 Commercial Banking: Commercial real estate loans 20,174 (3,988 ) (498 ) 993 23,667 Commercial loans 11,131 (3,517 ) (1,858 ) 996 15,510 Total Commercial Banking 31,305 (7,505 ) (2,356 ) 1,989 39,177 Total originated loans 50,845 9,071 (17,218 ) 3,699 55,293 Acquired loans: Personal Banking: Residential mortgage loans 77 130 (199 ) 75 71 Home equity loans 748 512 (1,063 ) 252 1,047 Other consumer loans 594 405 (689 ) 225 653 Total Personal Banking 1,419 1,047 (1,951 ) 552 1,771 Commercial Banking: Commercial real estate loans 3,301 1,832 (2,206 ) 667 3,008 Commercial loans 1,362 1,276 (847 ) 66 867 Total Commercial Banking 4,663 3,108 (3,053 ) 733 3,875 Total acquired loans 6,082 4,155 (5,004 ) 1,285 5,646 Total $ 56,927 13,226 (22,222 ) 4,984 60,939 The following table provides information related to the loan portfolio by portfolio segment and by class of financing receivable at September 30, 2018 (in thousands): Total loans receivable Allowance for loan losses Nonaccrual loans (1) Loans past due 90 days or more and still accruing (2) TDRs Allowance related to TDRs Additional commitments to customers with loans classified as TDRs Personal Banking: Residential mortgage loans $ 2,846,834 4,246 14,585 — 7,668 778 — Home equity loans 1,272,345 3,642 7,085 72 2,061 497 4 Consumer finance loans 5,888 1,650 39 — — — — Consumer loans 770,161 11,465 4,307 123 — — — Total Personal Banking 4,895,228 21,003 26,016 195 9,729 1,275 4 Commercial Banking: Commercial real estate loans 2,518,066 28,570 43,023 — 15,667 1,516 208 Commercial loans 582,768 6,402 5,188 — 3,751 276 209 Total Commercial Banking 3,100,834 34,972 48,211 — 19,418 1,792 417 Total $ 7,996,062 55,975 74,227 195 29,147 3,067 421 (1) Includes $9.8 million of nonaccrual TDRs. (2) Represents loans 90 days or more past maturity and still accruing. The following table provides information related to the loan portfolio by portfolio segment and by class of financing receivable at December 31, 2017 (in thousands): Total loans receivable Allowance for loan losses Nonaccrual loans (1) Loans past due 90 days or more and still accruing (2) TDRs Allowance related to TDRs Additional commitments to customers with loans classified as TDRs Personal Banking: Residential mortgage loans $ 2,776,203 3,955 14,791 — 8,000 815 — Home equity loans 1,310,355 4,834 8,907 120 1,716 462 4 Consumer finance loans 18,619 3,968 199 3 — — — Consumer loans 652,770 9,365 4,673 379 — — — Total Personal Banking 4,757,947 22,122 28,570 502 9,716 1,277 4 Commercial Banking: Commercial real estate loans 2,454,726 23,460 28,473 — 15,691 1,125 235 Commercial loans 580,736 11,213 7,412 — 6,697 742 8 Total Commercial Banking 3,035,462 34,673 35,885 — 22,388 1,867 243 Total $ 7,793,409 56,795 64,455 502 32,104 3,144 247 (1) Includes $12.3 million of nonaccrual TDRs. (2) Represents loans 90 days or more past maturity and still accruing. The following table provides information related to the composition of originated impaired loans by portfolio segment and by class of financing receivable at and for the nine months ended September 30, 2018 (in thousands): Nonaccrual loans 90 or more days delinquent Nonaccrual loans less than 90 days delinquent Loans less than 90 days delinquent reviewed for impairment TDRs less than 90 days delinquent not included elsewhere Total impaired loans Average recorded investment in impaired loans Interest income recognized on impaired loans Personal Banking: Residential mortgage loans $ 13,154 1,431 505 6,349 21,439 20,499 659 Home equity loans 5,838 1,247 — 1,812 8,897 9,250 375 Consumer finance loan 39 — — — 39 25 4 Consumer loans 3,535 772 — — 4,307 3,835 166 Total Personal Banking 22,566 3,450 505 8,161 34,682 33,609 1,204 Commercial Banking: Commercial real estate loans 27,122 15,901 22,583 5,114 70,720 39,985 1,195 Commercial loans 2,714 2,474 223 2,305 7,716 8,910 392 Total Commercial Banking 29,836 18,375 22,806 7,419 78,436 48,895 1,587 Total $ 52,402 21,825 23,311 15,580 113,118 82,504 2,791 The following table provides information related to the composition of originated impaired loans by portfolio segment and by class of financing receivable at and for the year ended December 31, 2017 (in thousands): Nonaccrual loans 90 or more days delinquent Nonaccrual loans less than 90 days delinquent Loans less than 90 days delinquent reviewed for impairment TDRs less than 90 days delinquent not included elsewhere Total impaired loans Average recorded investment in impaired loans Interest income recognized on impaired loans Personal Banking: Residential mortgage loans $ 13,509 1,282 — 6,814 21,605 21,531 892 Home equity loans 7,251 1,656 — 1,449 10,356 9,150 452 Consumer finance loans 199 — — — 199 379 20 Consumer loans 3,617 1,056 — — 4,673 4,042 188 Total Personal Banking 24,576 3,994 — 8,263 36,833 35,102 1,552 Commercial Banking: Commercial real estate loans 15,361 13,112 4,431 4,123 37,027 49,981 1,758 Commercial loans 3,140 4,272 906 2,447 10,765 12,110 672 Total Commercial Banking 18,501 17,384 5,337 6,570 47,792 62,091 2,430 Total $ 43,077 21,378 5,337 14,833 84,625 97,193 3,982 At September 30, 2018 , we expect to fully collect the carrying value of our purchased credit impaired loans and have determined that we can reasonably estimate their future cash flows including those loans that are 90 days or more delinquent. As a result, we do not consider our purchased credit impaired loans that are 90 days or more delinquent to be nonaccrual or impaired and continue to recognize interest income on these loans, including the loans’ accretable discount. The following table provides information related to the evaluation of impaired loans by portfolio segment and by class of financing receivable at September 30, 2018 (in thousands): Loans collectively evaluated for impairment Loans individually evaluated for impairment Loans individually evaluated for impairment for which there is a related impairment reserve Related impairment reserve Loans individually evaluated for impairment for which there is no related reserve Personal Banking: Residential mortgage loans $ 2,838,600 8,234 8,234 795 — Home equity loans 1,270,284 2,061 2,061 497 — Consumer finance loans 5,888 — — — — Consumer loans 770,125 36 36 7 — Total Personal Banking 4,884,897 10,331 10,331 1,299 — Commercial Banking: Commercial real estate loans 2,462,663 55,403 27,924 2,877 27,479 Commercial loans 577,023 5,745 4,328 475 1,417 Total Commercial Banking 3,039,686 61,148 32,252 3,352 28,896 Total $ 7,924,583 71,479 42,583 4,651 28,896 The following table provides information related to the evaluation of impaired loans by portfolio segment and by class of financing receivable at December 31, 2017 (in thousands): Loans collectively evaluated for impairment Loans individually evaluated for impairment Loans individually evaluated for impairment for which there is a related impairment reserve Related impairment reserve Loans individually evaluated for impairment for which there is no related reserve Personal Banking: Residential mortgage loans $ 2,767,635 8,568 8,568 816 — Home equity loans 1,308,639 1,716 1,716 461 — Consumer finance loans 18,619 — — — — Consumer loans 652,685 85 85 25 — Total Personal Banking 4,747,578 10,369 10,369 1,302 — Commercial Banking: Commercial real estate loans 2,433,755 20,971 18,470 1,859 2,501 Commercial loans 571,412 9,324 8,572 829 752 Total Commercial Banking 3,005,167 30,295 27,042 2,688 3,253 Total $ 7,752,745 40,664 37,411 3,990 3,253 Our loan portfolios include loans that have been modified in a troubled debt restructuring ("TDR"), where concessions have been granted to borrowers who have experienced financial difficulties. These concessions typically result from our loss mitigation activities and could include: extending the note’s maturity date, permitting interest only payments, reducing the interest rate to a rate lower than current market rates for new debt with similar risk, reducing the principal payment, principal forbearance or other actions. These concessions are applicable to all loan segments and classes. Certain TDRs are classified as nonperforming at the time of restructuring and may be returned to performing status after considering the borrower’s sustained repayment performance for a period of at least nine months. When we modify loans in a TDR, we evaluate any possible impairment similar to other impaired loans based on the present value of expected future cash flows, discounted at the contractual interest rate of the original loan agreement, the loan’s observable market price or the current fair value of the collateral, less selling costs, for collateral dependent loans. If we determine that the value of the modified loan is less than the recorded investment in the loan (net of previous charge-offs, deferred loan fees or costs and unamortized premium or discount), impairment is recognized through an allowance estimate or a charge-off to the allowance. In periods subsequent to modification, we evaluate all TDRs, including those that have payment defaults, for possible impairment, in accordance with ASC 310-10. As a result, loans modified in a TDR may have the financial effect of increasing the specific allowance associated with the loan. 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, we evaluate the loan for possible further impairment. The allowance may be increased, adjustments may be made in the allocation of the allowance, partial charge-offs may be taken to further write-down the carrying value of the loan, or the loan may be charged-off completely. The following table provides a roll forward of troubled debt restructurings for the periods indicated (dollars in thousands): For the quarter ended September 30, 2018 2017 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 205 $ 30,662 203 $ 41,860 New TDRs 7 647 6 546 Re-modified TDRs 3 306 2 265 Net paydowns (1,215 ) (987 ) Charge-offs: Residential mortgage loans — — — — Home equity loans — — — — Commercial real estate loans 1 (91 ) 2 (2,498 ) Commercial loans 5 (619 ) — — Paid-off loans: Residential mortgage loans 2 (2 ) — — Home equity loans 2 (12 ) 3 (30 ) Commercial real estate loans 2 (360 ) 1 (564 ) Commercial loans 3 (169 ) 2 (123 ) Ending TDR balance: 197 $ 29,147 201 $ 38,469 Accruing TDRs $ 19,370 $ 20,660 Non-accrual TDRs 9,777 17,809 The following table provides a roll forward of troubled debt restructurings for the periods indicated (dollars in thousands): For the nine months ended September 30, 2018 2017 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 205 $ 32,104 225 $ 42,926 New TDRs 26 6,443 13 4,685 Re-modified TDRs 3 306 3 710 Net paydowns (3,037 ) (3,668 ) Charge-offs: Residential mortgage loans 1 (135 ) — — Home equity loans — — — — Commercial real estate loans 2 (294 ) 2 (2,498 ) Commercial loans 6 (1,340 ) 6 (259 ) Paid-off loans: Residential mortgage loans 4 (257 ) — — Home equity loans 4 (59 ) 8 (62 ) Commercial real estate loans 9 (2,183 ) 11 (1,109 ) Commercial loans 8 (2,401 ) 10 (2,256 ) Ending TDR balance: 197 $ 29,147 201 $ 38,469 Accruing TDRs $ 19,370 $ 20,660 Non-accrual TDRs 9,777 17,809 The following tables provide information related to troubled debt restructurings (including re-modified TDRs) by portfolio segment and by class of financing receivable during the periods indicated (dollars in thousands): For the quarter ended For the nine months ended Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Troubled debt restructurings: Personal Banking: Residential mortgage loans 2 $ 342 342 35 6 $ 616 612 62 Home equity loans 4 194 193 47 12 511 462 113 Total Personal Banking 6 536 535 82 18 1,127 1,074 175 Commercial Banking: Commercial real estate loans 3 372 361 42 5 3,255 3,198 97 Commercial loans 1 45 45 5 6 2,367 1,484 21 Total Commercial Banking 4 417 406 47 11 5,622 4,682 118 Total 10 $ 953 941 129 29 $ 6,749 5,756 293 During the quarter and nine months ended September 30, 2018 , no TDRs modified within the previous twelve months have subsequently defaulted. The following tables provide information related to troubled debt restructurings (including re-modified TDRs) by portfolio segment and by class of financing receivable during the periods indicated (dollars in thousands): For the quarter ended For the nine months ended Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Troubled debt restructurings: Personal Banking: Residential mortgage loans 2 $ 403 402 40 5 $ 1,297 1,276 128 Home equity loans 2 122 119 30 2 122 119 30 Total Personal Banking 4 525 521 70 7 1,419 1,395 158 Commercial Banking: Commercial real estate loans 2 114 116 13 6 3,600 3,282 285 Commercial loans 2 172 170 71 3 376 352 84 Total Commercial Banking 4 286 286 84 9 3,976 3,634 369 Total 8 $ 811 807 154 16 $ 5,395 5,029 527 Troubled debt restructurings modified within the previous twelve months that have subsequently defaulted: Personal Banking: Residential mortgage loans — $ — — — — $ — — — Home equity loans — — — — — — — — Total Personal Banking — — — — — — — — Commercial Banking: Commercial real estate loans 1 90 90 11 1 90 90 11 Commercial loans 1 150 150 70 1 150 150 70 Total Commercial Banking 2 240 240 81 2 240 240 81 Total 2 $ 240 240 81 2 $ 240 240 81 The following table provides information as of September 30, 2018 for troubled debt restructurings (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended September 30, 2018 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 2 $ — — 342 342 Home equity loans 4 193 — — 193 Total Personal Banking 6 193 — 342 — 535 Commercial Banking: Commercial real estate loans 3 — — 361 361 Commercial loans 1 — — 45 45 Total Commercial Banking 4 — — 406 — 406 Total 10 $ 193 — 748 — 941 The following table provides information as of September 30, 2017 for troubled debt restructurings (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended September 30, 2017 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 2 $ 250 — — 152 402 Home equity loans 2 119 — — — 119 Total Personal Banking 4 369 — — 152 521 Commercial Banking: Commercial real estate loans 2 — — 116 — 116 Commercial loans 2 — — 170 — 170 Total Commercial Banking 4 — — 286 — 286 Total 8 $ 369 — 286 152 807 The following table provides information as of September 30, 2018 for troubled debt restructurings (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the nine months ended September 30, 2018 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 6 $ 7 — 519 86 612 Home equity loans 12 222 — 47 193 462 Total Personal Banking 18 229 — 566 279 1,074 Commercial Banking: Commercial real estate loans 5 — 482 361 2,355 3,198 Commercial loans 6 — — 183 1,301 1,484 Total Commercial Banking 11 — 482 544 3,656 4,682 Total 29 $ 229 482 1,110 3,935 5,756 The following table provides information as of September 30, 2017 for troubled debt restructurings (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the nine months ended September 30, 2017 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 5 $ 360 — — 916 1,276 Home equity loans 2 119 — — — 119 Total Personal Banking 7 479 — — 916 1,395 Commercial Banking: Commercial real estate loans 6 — 2,710 572 — 3,282 Commercial loans 3 — — 352 — 352 Total Commercial Banking 9 — 2,710 924 — 3,634 Total 16 $ 479 2,710 924 916 5,029 During the nine months ended September 30, 2018 , three commercial banking TDRs were re-modified. During the nine months ended September 30, 2017 , three personal banking TDRs were re-modified. The following table provides information related to loan payment delinquencies at September 30, 2018 (in thousands): 30-59 Days delinquent 60-89 Days delinquent 90 Days or greater delinquent Total delinquency Current Total loans receivable 90 Days or greater delinquent and accruing (1) Originated loans: Personal Banking: Residential mortgage loans $ 1,404 4,392 11,695 17,491 2,731,521 2,749,012 — Home equity loans 4,622 2,118 5,013 11,753 1,036,620 1,048,373 — Consumer finance loans 632 234 39 905 4,983 5,888 — Consumer loans 7,893 3,032 3,166 14,091 688,850 702,941 — Total Personal Banking 14,551 9,776 19,913 44,240 4,461,974 4,506,214 — Commercial Banking: Commercial real estate loans 2,329 5,370 21,771 29,470 2,247,959 2,277,429 — Commercial loans 340 807 2,112 3,259 529,505 532,764 — Total Commercial Banking 2,669 6,177 23,883 32,729 2,777,464 2,810,193 — Total originated loans 17,220 15,953 43,796 76,969 7,239,438 7,316,407 — Acquired loans: Personal Banking: Residential mortgage loans 96 312 1,788 2,196 95,626 97,822 329 Home equity loans 1,051 418 825 2,294 221,678 223,972 — Consumer loans 515 219 375 1,109 66,111 67,220 6 Total Personal Banking 1,662 949 2,988 5,599 383,415 389,014 335 Commercial Banking: Commercial real estate loans 3,057 1,308 5,457 9,822 230,815 240,637 106 Commercial loans 282 297 602 1,181 48,823 50,004 — Total Commercial Banking 3,339 1,605 6,059 11,003 279,638 290,641 106 Total acquired loans 5,001 2,554 9,047 16,602 663,053 679,655 441 Total loans $ 22,221 18,507 52,843 93,571 7,902,491 7,996,062 441 (1) Represents acquired loans that were originally recorded at fair value upon acquisition. These loans are considered to be accruing because we can reasonably estimate future cash flows on and expect to fully collect the carrying value of these loans. Therefore, we are accreting the difference between the carrying value and their expected cash flows into interest income. The following table provides information related to loan payment delinquencies at December 31, 2017 (in thousands): 30-59 Days delinquent 60-89 Days delinquent 90 Days or greater delinquent Total delinquency Current Total loans receivable 90 Days or Originated loans: Personal Banking: Residential mortgage loans $ 23,786 6,030 12,613 42,429 2,619,951 2,662,380 — Home equity loans 6,094 2,333 6,043 14,470 1,037,088 1,051,558 — Consumer finance loans 2,128 1,113 199 3,440 15,179 18,619 — Consumer loans 9,762 2,834 3,274 15,870 537,496 553,366 — Total Personal Banking 41,770 12,310 22,129 76,209 4,209,714 4,285,923 — Commercial Banking: Commercial real estate loans 5,520 2,133 10,629 18,282 2,142,930 2,161,212 — Commercial loans 1,469 204 2,806 4,479 516,719 521,198 — Total Commercial Banking 6,989 2,337 13,435 22,761 2,659,649 2,682,410 — Total originated loan 48,759 14,647 35,564 98,970 6,869,363 6,968,333 — Acquired loans: Personal Banking: Residential mortgage loans 1,998 205 1,277 3,480 110,343 113,823 381 Home equity loans 1,367 538 1,306 3,211 255,586 258,797 98 Consumer loans 1,150 517 353 2,020 97,384 99,404 10 Total Personal Banking 4,515 1,260 2,936 8,711 463,313 472,024 489 Commercial Banking: Commercial real estate loans 2,795 406 5,655 8,856 284,658 293,514 923 Commercial loans 396 237 334 967 58,571 59,538 — Total Commercial Banking 3,191 643 5,989 9,823 343,229 353,052 923 Total acquired loan 7,706 1,903 8,925 18,534 806,542 825,076 1,412 Total $ 56,465 16,550 44,489 117,504 7,675,905 7,793,409 1,412 (1) Represents acquired loans that were originally recorded at fair value upon acquisition. These loans are considered to be accruing because we can reasonably estimate future cash flows and expect to fully collect the carrying value of these loans. Therefore, we are accreting the difference between the carrying value and their expected cash flows into interest income. Credit quality indicators : We categorize loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. We analyze loans individually by classifying the loans by credit risk. Credit relationships greater than or equal to $1.0 million classified as special mention or substandard are reviewed quarterly for deterioration or improvement to determine if the loan is appropriately classified. We use the following definitions for risk ratings other than pass: Special mention — Loans designated as special mention have specific, well-defined risk issues, which create a high level of uncertainty regarding the long-term viability of the business. Loans in this class are considered to have high-risk characteristics. A special mention loan exhibits material negative financial trends due to company-specific or systemic conditions. If these potential weaknesses are not mitigated, they threaten the borrower’s capacity to meet its debt obligations. Special mention loans still demonstrate sufficient financial flexibility to react to and positively address the root cause of the adverse financial trends without significant deviations from their current business strategy. Their potential weaknesses deserve our close attention and warrant enhanced monitoring. Substandard — Loans classified as substandard are inadequately protected by the current net worth and payment capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Doubtful — Loans classified as doubtful have all the weaknesses inherent in those classified as substandard. In addition, those weaknesses make collection or liquidation in full highly questionable and improbable. A loan classified as doubtful exhibits discernible loss potential, but a complete loss seems very unlikely. The possibility of a loss on a doubtful loan is high, but because of certain important and reasonably specific pending factors that may strengthen the loan, its classification as an estimated loss is deferred until a more exact status can be determined. Loss — Loans classified as loss are considered uncollectible and of such value that the continuance as a loan is not warranted. A loss classification does not mean that the loan has no recovery or salvage value; instead, it means that it is not practical or desirable to defer writing off all or a portion of a basically worthless loan even though partial recovery may be possible in the future. The following table sets forth information about credit quality indicators updated during the quarter ended September 30, 2018 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans: Personal Banking: Residential mortgage loans $ 2,739,243 — 9,769 — — 2,749,012 Home equity loans 1,042,627 — 5,746 — — 1,048,373 Consumer finance loans 5,849 — 39 — — 5,888 Consumer loans 699,033 — 3,908 — — 702,941 Total Personal Banking 4,486,752 — 19,462 — — 4,506,214 Commercial Banking: Commercial real estate loans 2,083,302 47,983 146,144 — — 2,277,429 Commercial loans 487,143 21,120 24,501 — — 532,764 Total Commercial Banking 2,570,445 69,103 170,645 — — 2,810,19

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The following table provides information for intangible assets subject to amortization at the dates indicated (in thousands): September 30, December 31, Amortizable intangible assets: Core deposit intangibles — gross $ 63,685 63,685 Less: accumulated amortization (43,886 ) (40,029 ) Core deposit intangibles — net 19,799 23,656 Customer and Contract intangible assets — gross 10,474 10,474 Less: accumulated amortization (9,106 ) (8,461 ) Customer and Contract intangible assets — net $ 1,368 2,013 The following table shows the actual aggregate amortization expense for the quarters ended September 30, 2018 and 2017 , as well as the estimated aggregate amortization expense, based upon current levels of intangible assets, for the current fiscal year and each of the five succeeding fiscal years (in thousands): For the quarter ended September 30, 2018 $ 1,462 For the quarter ended September 30, 2017 1,691 For the nine months ended September 30, 2018 4,502 For the nine months ended September 30, 2017 5,189 For the year ending December 31, 2018 5,848 For the year ending December 31, 2019 4,933 For the year ending December 31, 2020 4,017 For the year ending December 31, 2021 3,188 For the year ending December 31, 2022 2,456 For the year ending December 31, 2023 1,847 The following table provides information for the changes in the carrying amount of goodwill (in thousands): Total Balance at December 31, 2016 $ 307,420 Goodwill from acquisition — Balance at December 31, 2017 307,420 Goodwill from acquisition — Balance at September 30, 2018 $ 307,420 We performed our annual goodwill impairment test as of June 30, 2018 using Accounting Standard Codification 350, ("Step 0"), as updated by ASU 2017-04 and concluded that goodwill was not impaired. As of September 30, 2018 , there were no changes in our operations that would cause us to update that goodwill impairment test.

Borrowed Funds

Borrowed Funds	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Borrowed Funds	Borrowed Funds Borrowings Borrowings from the Federal Home Loan Bank of Pittsburgh ("FHLB"), if any, are secured by our residential first mortgage and other qualifying loans. Certain of these borrowings are subject to restrictions or penalties in the event of prepayment. The revolving line of credit with the FHLB carries a commitment of $150.0 million . The rate is adjusted daily by the FHLB, and any borrowings on this line may be repaid at any time without penalty. At September 30, 2018 and December 31, 2017 the balance of the revolving line of credit was $85.2 million and $0 , respectively. At September 30, 2018 and December 31, 2017 collateralized borrowings, due within one year, were $91.8 million , and $108.2 million , respectively. These borrowings are collateralized by cash or various securities held in safekeeping by the FHLB. Trust Preferred Securities We have 3 statutory business trusts: Northwest Bancorp Capital Trust III, a Delaware statutory business trust, Northwest Bancorp Statutory Trust IV, a Connecticut statutory business trust and LNB Trust II, a Delaware statutory business trust (the Trusts). The trusts exist solely to issue preferred securities to third parties for cash, issue common securities to the Company in exchange for capitalization of the Trusts, invest the proceeds from the sale of trust securities in an equivalent amount of debentures of the Company, and engage in other activities that are incidental to those previously listed. Northwest Bancorp Capital Trust III issued 50,000 cumulative trust preferred securities in a private transaction to a pooled investment vehicle on December 5, 2005 (liquidation value of $1,000 per preferred security or $50,000,000 ) with a stated maturity of December 30, 2035 and a floating rate of interest, which is reset quarterly, equal to three-month LIBOR plus 1.38% . Northwest Bancorp Statutory Trust IV issued 50,000 cumulative trust preferred securities in a private transaction to a pooled investment vehicle on December 15, 2005 (liquidation value of $1,000 per preferred security or $50,000,000 ) with a stated maturity of December 15, 2035 and a floating rate of interest, which is reset quarterly, equal to three-month LIBOR plus 1.38% . LNB Trust II has 7,875 cumulative trust preferred securities outstanding (liquidation value of $1,000 per preferred security or $7,875,000 ) with a stated maturity of June 15, 2037 and a floating rate of interest, which resets quarterly, equal to three-month LIBOR plus 1.48% . As the shareholders of the trust preferred securities are the primary beneficiaries of the Trusts, the Trusts are not consolidated in our financial statements. The Trusts have invested the proceeds of the offerings in junior subordinated deferrable interest debentures issued by the Company. The structure of these debentures mirrors the structure of the trust-preferred securities. Northwest Bancorp Capital Trust III holds $51,547,000 of the Company’s junior subordinated debentures due December 30, 2035 with a floating rate of interest, reset quarterly, of three-month LIBOR plus 1.38% . The rate in effect at September 30, 2018 was 3.78% . Northwest Bancorp Statutory Trust IV holds $51,547,000 of the Company’s junior subordinated debentures due December 15, 2035 with a floating rate of interest, reset quarterly, of three-month LIBOR plus 1.38% . The rate in effect at September 30, 2018 was 3.71% . LNB Trust II holds $8,119,000 of the Company's junior subordinated debentures due June 15, 2037, with a floating rate of interest, reset quarterly, of three-month LIBOR plus 1.48% . The rate in effect at September 30, 2018 was 3.81% . Cash distributions on the trust securities are made on a quarterly basis to the extent interest on the debentures is received by the Trusts. We have the right to defer payment of interest on the subordinated debentures at any time, or from time-to-time, for periods not exceeding 5 years . If interest payments on the subordinated debentures are deferred, the distributions on the trust securities also are deferred. To date there have been no interest deferrals. Interest on the subordinated debentures and distributions on the trust securities is cumulative. Our obligation constitutes a full, irrevocable, and unconditional guarantee on a subordinated basis of the obligations of the trust under the preferred securities. The Trusts must redeem the preferred securities when the debentures are paid at maturity or upon an earlier redemption of the debentures to the extent the debentures are redeemed. All or part of the debentures may be redeemed at any time. Also, the debentures may be redeemed at any time if existing laws or regulations, or the interpretation or application of these laws or regulations, change causing: • the interest on the debentures to no longer be deductible by the Company for federal income tax purposes; • the trust to become subject to federal income tax or to certain other taxes or governmental charges; • the trust to register as an investment company; or • the preferred securities do not qualify as Tier I capital. We may, at any time, dissolve any of the Trusts and distribute the debentures to the trust security holders, subject to receipt of any required regulatory approval.

Guarantees

Guarantees	9 Months Ended
	Sep. 30, 2018
Guarantees [Abstract]
Guarantees	Guarantees We issue standby letters of credit in the normal course of business. 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 are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party. We are required to perform under a standby letter of credit when drawn upon by the guaranteed third party in the case of nonperformance by our customer. The credit risk associated with standby letters of credit is essentially the same as that involved in extending loans to customers and is subject to normal loan underwriting procedures. Collateral may be obtained based on management’s credit assessment of the customer. At September 30, 2018 , the maximum potential amount of future payments we could be required to make under these non-recourse standby letters of credit was $33.8 million , of which $27.3 million is fully collateralized. At September 30, 2018 , we had a liability, which represents deferred income, of $133,000 related to the standby letters of credit.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per common share (EPS) is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding for the period, without considering any dilutive items. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the Company. All stock options outstanding during the quarter ended September 30, 2018 and 2017 , were included in the computation of diluted earnings per share because the options’ exercise price was less than the average market price of the common shares of $ 18.01 and $ 16.26 , respectively. All stock options outstanding during the nine months ended September 30, 2018 and 2017 , were included in the computation of diluted earnings per share because the options’ exercise price was less than the average market price of the common shares of $17.30 and $16.58 , respectively. The computation of basic and diluted earnings per share follows (in thousands, except share data and per share amounts): Quarter ended Nine months ended 2018 2017 2018 2017 Reported net income $ 27,740 23,591 79,024 72,319 Weighted average common shares outstanding 102,334,954 101,163,534 101,937,338 100,921,322 Dilutive potential shares due to effect of stock options 1,607,741 1,400,942 1,566,731 1,617,020 Total weighted average common shares and dilutive potential shares 103,942,695 102,564,476 103,504,069 102,538,342 Basic earnings per share: $ 0.27 0.23 0.78 0.72 Diluted earnings per share: $ 0.27 0.23 0.76 0.71

Pension and Other Post-retireme

Pension and Other Post-retirement Benefits	9 Months Ended
	Sep. 30, 2018
Retirement Benefits [Abstract]
Pension and Other Post-retirement Benefits	Pension and Other Post-retirement Benefits The following table sets forth the net periodic costs for the defined benefit pension plans and post retirement healthcare plans for the periods indicated (in thousands): Quarter ended September 30, Pension benefits Other post-retirement benefits 2018 2017 2018 2017 Service cost $ 1,716 1,537 — — Interest cost 1,678 1,719 14 17 Expected return on plan assets (2,992 ) (2,628 ) — — Amortization of prior service cost (581 ) (580 ) — — Amortization of the net loss 872 928 24 27 Net periodic cost $ 693 976 38 44 Nine months ended September 30, Pension benefits Other post-retirement benefits 2018 2017 2018 2017 Service cost $ 5,148 4,612 — — Interest cost 5,034 5,159 41 51 Expected return on plan assets (8,976 ) (7,884 ) — — Amortization of prior service cost (1,742 ) (1,742 ) — — Amortization of the net loss 2,617 2,783 73 81 Net periodic cost $ 2,081 2,928 114 132 We anticipate making a contribution to our defined benefit pension plan of $4.0 million to $6.0 million during the year ending December 31, 2018 .

Disclosures About Fair Value of

Disclosures About Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Disclosures About Fair Value of Financial Instruments	Disclosures About Fair Value of Financial Instruments We are required to disclose fair value information about financial instruments whether or not recognized in the consolidated statement of financial condition. Fair value information of certain financial instruments and all nonfinancial instruments is not required to be disclosed. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Company. Financial assets and liabilities recognized or disclosed at fair value on a recurring basis and certain financial assets and liabilities on a non-recurring basis are accounted for using a three-level hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. This hierarchy gives the highest priority to quoted prices with readily available independent data in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable market inputs (Level 3). When various inputs for measurement fall within different levels of the fair value hierarchy, the lowest level input that has a significant impact on fair value measurement is used. Financial assets and liabilities are categorized based upon the following characteristics or inputs to the valuation techniques: • Level 1 - Financial assets and liabilities for which inputs are observable and are obtained from reliable quoted prices for identical assets or liabilities in actively traded markets. This is the most reliable fair value measurement and includes, for example, active exchange-traded equity securities. • Level 2 - Financial assets and liabilities for which values are based on quoted prices in markets that are not active or for which values are based on similar assets or liabilities that are actively traded. Level 2 also includes pricing models in which the inputs are corroborated by market data, for example, matrix pricing. • Level 3 - Financial assets and liabilities for which values are based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. Level 3 inputs include the following: • Quotes from brokers or other external sources that are not considered binding; • Quotes from brokers or other external sources where it cannot be determined that market participants would in fact transact for the asset or liability at the quoted price; • Quotes and other information from brokers or other external sources where the inputs are not deemed observable. We are responsible for the valuation process and as part of this process may use data from outside sources in establishing fair value. We perform due diligence to understand the inputs used or how the data was calculated or derived. We also corroborate the reasonableness of external inputs in the valuation process. The carrying amounts reported in the consolidated statement of financial condition approximate fair value for the following financial instruments: cash on hand, interest-earning deposits in other institutions, federal funds sold and other short term investments, accrued interest receivable, accrued interest payable, and marketable securities available-for-sale. Marketable Securities Where available, market values are based on quoted market prices, dealer quotes, and prices obtained from independent pricing services. Debt securities - available for sale - Generally, debt securities are valued using pricing for similar securities, recently executed transactions and other pricing models utilizing observable inputs. The valuation for most debt securities is classified as Level 2. Securities within Level 2 include corporate bonds, municipal bonds, mortgage-backed securities and US government obligations. Equity securities - available for sale - Publicly traded securities valued using quoted market prices are classified as Level 1. We consider the financial condition of the issuer to determine if the securities have indicators of impairment. Debt securities - held to maturity - The fair value of debt securities held to maturity is determined in the same manner as debt securities available for sale. Loans Held for Sale The estimated fair value of loans held for sale is based on market bids obtained from potential buyers. Loans Held for Investment With the adoption of ASU 2016-01 on January 1, 2018, we refined our methodology to estimate the fair value of our loan portfolio to use the exit price notion as required by the guidance, which was applied on a prospective basis resulting in prior-periods no longer being comparable. The fair value of the loans is estimated using a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans adjusted for liquidity and credit risk. Federal Home Loan Bank (“FHLB”) Stock Due to the restrictions placed on transferability, FHLB stock is classified as Level 3. Borrowed Funds Fixed rate advances are valued by comparing their contractual cost to the prevailing market cost. The carrying amount of collateralized borrowings approximates the fair value. Junior Subordinated Debentures The fair value of junior subordinated debentures is calculated using the discounted cash flows at the prevailing rate of interest. Cash Flow Hedges — Interest Rate and Foreign Exchange Swap Agreements ("swaps") The fair value of the interest rate swaps is based upon the present value of the expected future cash flows using the LIBOR swap curve, the basis for the underlying interest rate. To price interest rate swaps, cash flows are first projected for each payment date using the fixed rate for the fixed side of the swap and the forward rates for the floating side of the swap. These swap cash flows are then discounted to time zero using LIBOR zero-coupon interest rates. The sum of the present value of both legs is the fair market value of the interest rate swap. These valuations have been derived from our third party vendor’s proprietary models rather than actual market quotations. The proprietary models are based upon financial principles and assumptions that we believe to be reasonable. The fair value of the foreign exchange swap is derived from proprietary models rather than actual market quotations. The proprietary models are based upon financial principles and assumptions we believe to be reasonable. Off-Balance Sheet Financial Instruments These financial instruments generally are not sold or traded, and estimated fair values are not readily available. However, the fair value of commitments to extend credit and standby letters of credit is estimated using the fees currently charged to enter into similar agreements. Commitments to extend credit are generally short-term in nature and, if drawn upon, are issued under current market terms. At September 30, 2018 and December 31, 2017 , there was no significant unrealized appreciation or depreciation on these financial instruments. The following table sets forth the carrying amount and estimated fair value of our financial instruments included in the consolidated statement of financial condition at September 30, 2018 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 73,946 73,946 73,946 — — Securities available-for-sale 811,556 811,556 — 811,556 — Securities held-to-maturity 24,222 23,534 — 23,534 — Loans receivable, net 7,940,087 7,721,559 — — 7,721,559 Accrued interest receivable 25,798 25,798 25,798 — — Interest rate swaps 4,386 4,386 — 4,386 — FHLB Stock 15,452 15,452 — — 15,452 Total financial assets $ 8,895,447 8,676,231 99,744 839,476 7,737,011 Financial liabilities: Savings and checking deposits $ 6,550,748 6,550,748 6,550,748 — — Time deposits 1,403,205 1,431,500 — — 1,431,500 Borrowed funds 179,117 179,111 179,111 — — Junior subordinated debentures 111,213 104,609 — — 104,609 Interest rate swaps 4,479 4,479 — 4,479 — Accrued interest payable 627 627 627 — — Total financial liabilities $ 8,249,389 8,271,074 6,730,486 4,479 1,536,109 The following table sets forth the carrying amount and estimated fair value of our financial instruments included in the consolidated statement of financial condition at December 31, 2017 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 77,710 77,710 77,710 — — Securities available-for-sale 792,535 792,535 574 791,961 — Securities held-to-maturity 29,678 29,667 — 29,667 — Loans receivable, net 7,736,614 7,762,562 3,128 — 7,759,434 Accrued Interest Receivable 23,352 23,352 23,352 — — Interest rate swaps 214 214 — 214 — FHLB Stock 11,733 11,733 — — 11,733 Total financial assets $ 8,671,836 8,697,773 104,764 821,842 7,771,167 Financial liabilities: Savings and checking accounts $ 6,414,366 6,414,366 6,414,366 — — Time deposits 1,412,623 1,433,380 — — 1,433,380 Borrowed funds 108,238 108,238 108,238 — — Junior subordinated debentures 111,213 110,954 — — 110,954 Interest rate swaps 1,278 1,278 — 1,278 — Foreign exchange swaps 61 61 — 61 — Accrued interest payable 460 460 460 — — Total financial liabilities $ 8,048,239 8,068,737 6,523,064 1,339 1,544,334 Fair value estimates are made at a point-in-time, based on relevant market data and information about the instrument. The methods and assumptions detailed above were used in estimating the fair value of financial instruments at both September 30, 2018 and December 31, 2017 . There were no transfers of financial instruments between Level 1 and Level 2 during the quarter ended September 30, 2018 . The following table represents assets and liabilities measured at fair value on a recurring basis at September 30, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Debt securities: U.S. government and agencies $ — 14,695 — 14,695 Government sponsored enterprises — 186,445 — 186,445 States and political subdivisions — 24,744 — 24,744 Corporate — 912 — 912 Total debt securities — 226,796 — 226,796 Residential mortgage-backed securities: GNMA — 27,820 — 27,820 FNMA — 71,251 — 71,251 FHLMC — 53,907 — 53,907 Non-agency — 535 — 535 Collateralized mortgage obligations: GNMA — 53,969 — 53,969 FNMA — 205,066 — 205,066 FHLMC — 172,212 — 172,212 Non-agency — — — — Total mortgage-backed securities — 584,760 — 584,760 Interest rate swaps — 4,386 — 4,386 Total Assets $ — 815,942 — 815,942 Interest rate swaps $ — 4,479 — 4,479 Total Liabilities $ — 4,479 — 4,479 The following table represents assets and liabilities measured at fair value on a recurring basis at December 31, 2017 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Equity securities $ 574 — — 574 Debt securities: U.S. government and agencies — 1 — 1 Government sponsored enterprises — 209,269 — 209,269 States and political subdivisions — 51,056 — 51,056 Corporate — 909 — 909 Total debt securities — 261,235 — 261,235 Residential mortgage-backed securities: GNMA — 29,695 — 29,695 FNMA — 82,969 — 82,969 FHLMC — 64,021 — 64,021 Non-agency — 555 — 555 Collateralized mortgage obligations: GNMA — 4,769 — 4,769 FNMA — 191,512 — 191,512 FHLMC — 157,190 — 157,190 Non-agency — 15 — 15 Total mortgage-backed securities — 530,726 — 530,726 Interest rate swaps — 214 — 214 Total Assets $ 574 792,175 — 792,749 Interest rate swaps $ — 1,278 — 1,278 Foreign exchange swaps — 61 — 61 Total Liabilities $ — 1,339 — 1,339 The table below presents a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the periods indicated (in thousands): Quarter ended Nine months ended September 30, September 30, September 30, September 30, Beginning balance January 1, $ — 10,638 — 9,366 Total net realized investment gains/ (losses) and net change in unrealized appreciation/ (depreciation): Included in net income as OTTI — — — — Included in other comprehensive income — 21 — 1,293 Purchases — — — — Sales — — — — Transfers in to Level 3 — — — — Transfers out of Level 3 — — — — Ending balance September 30, $ — 10,659 — 10,659 Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as loans held for sale, loans measured for impairment, real estate owned, and mortgage servicing rights. The following table represents the fair market measurement for only those nonrecurring assets that had a fair market value below the carrying amount as of September 30, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 37,932 37,932 Real estate owned — — 2,486 2,486 Total assets $ — — 40,418 40,418 The following table represents the fair market measurement for only those nonrecurring assets that had a fair market value below the carrying amount as of December 31, 2017 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 33,421 33,421 Real estate owned — — 5,666 5,666 Total assets $ — — 39,087 39,087 Impaired loans — A loan is considered to be impaired as described in Note 1 of the Notes to Consolidated Financial Statements in Item 8 of Part II of our 2017 Annual Report on Form 10-K. We classify loans individually evaluated for impairment that require a specific reserve as nonrecurring Level 3. Real Estate Owned — Real estate owned is comprised of property acquired through foreclosure or voluntarily conveyed by borrowers. These assets are recorded on the date acquired at the lower of the related loan balance or fair value, less estimated disposition costs, with the fair value being determined by appraisal. Subsequently, foreclosed assets are valued at the lower of the amount recorded at acquisition date or fair value, less estimated disposition costs. We classify real estate owned as nonrecurring Level 3. The table presents additional quantitative information about assets measured at fair value on a recurring and nonrecurring basis and for which we have utilized Level 3 inputs to determine fair value at September 30, 2018 (dollar amounts in thousands): Fair value Valuation techniques Significant unobservable inputs Range (weighted average) Loans measured for impairment 37,932 Appraisal value (1) Estimated cost to sell 10.0% Discounted cash flow Discount rate 4.25% to 10.0% (7.50%) Real estate owned 2,486 Appraisal value (1) Estimated cost to sell 10.0% (1) Fair value is generally determined through independent appraisals of the underlying collateral, which may include Level 3 inputs that are not identifiable, or by using the discounted cash flow method if the loan is not collateral dependent.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments We are a party to derivative financial instruments in the normal course of business to manage our own exposure to fluctuations in interest rates and to meet the needs of our customers. The primary derivatives that we use are interest rate swaps and caps and foreign exchange contracts, which are entered into with counterparties that meet established credit standards. We believe that the credit risk inherent in all of our derivative contracts is minimal based on our credit standards and the netting and collateral provisions of the interest rate swap agreements. Derivatives Designated as Hedging Instruments We are currently a counterparty to one interest rate swap agreement ("swap") which is designated as a cash flow hedge. The swap is intended to protect against the variability of cash flows associated with Northwest Bancorp Capital Trust IV and modifies its re-pricing characteristics, wherein for 10 years expiring in December 2018, the Company receives interest of three-month LIBOR from a counterparty and pays a fixed rate of 4.09% to the same counterparty calculated on a notional amount of $ 25.0 million . The swap agreement was entered into with a counterparty that met our credit standards and the agreement contains collateral provisions protecting the at-risk party. We believe that the credit risk inherent in the contract is not significant. At September 30, 2018 , $255,000 of cash was pledged as collateral to the counterparty. This cash flow hedge is recorded within other liabilities on the consolidated statement of financial condition at their estimated fair value. At September 30, 2018 , the fair value of the swap agreements was $(93,000) . There was no material hedge ineffectiveness for the swap discussed above. Derivatives Not Designated as Hedging Instruments In addition to our derivatives designated in hedge relationships, we act as an interest rate or foreign exchange swap counterparty for certain commercial borrowers in the normal course of servicing our customers, which are accounted for at fair value. We manage our exposure to such interest rate or foreign exchange swaps by entering into corresponding and offsetting interest rate swaps with third parties that mirror the terms of the swaps we have with the commercial borrowers. These positions (referred to as “customer swaps”) directly offset each other and our exposure is the fair value of the derivatives due to changes in credit risk of our commercial borrowers and third parties. Customer swaps are recorded within other assets or other liabilities on the consolidated statement of financial condition at their estimated fair value. Changes to the fair value of assets and liabilities arising from these derivatives are included, net, in other operating income in the consolidated statement of income. The following table presents information regarding our derivative financial instruments for the periods indicated: Asset Derivatives Liability Derivatives Notional Amount Fair Value Notional Amount Fair Value At September 30, 2018 Derivatives designed as hedging instruments: Interest rate swap agreements $ — — 25,000 93 Derivatives not designed as hedging instruments: Interest rate swap agreements 209,353 4,386 209,353 4,386 Total derivatives $ 209,353 4,386 234,353 4,479 At December 31, 2017 Derivatives designed as hedging instruments: Interest rate swap agreements $ — — 50,000 1,064 Derivatives not designed as hedging instruments: Interest rate swap agreements 92,631 214 92,631 214 Foreign exchange swap agreements — — 12,344 61 Total derivatives $ 92,631 214 154,975 1,339 The following table presents income or expense recognized on derivatives for the periods indicated: For the quarter ended For the nine months ended September 30, 2018 2017 2018 2017 Hedging interest rate derivatives: Increase in interest expense 257 393 857 1,216 Non-hedging swap derivatives: Increase/ (decrease) in other income — 99 (288 ) 333

Legal Proceedings

Legal Proceedings	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Legal Proceedings	Legal Proceedings We establish accruals for legal proceedings when information related to the loss contingencies represented by those matters indicates both that a loss is probable and that the amount of loss can be reasonably estimated. As of September 30, 2018 we have not accrued for any legal proceedings based on our analysis of currently available information which is subject to significant judgment and a variety of assumptions and uncertainties. Any such accruals are adjusted thereafter as appropriate to reflect changes in circumstances. Due to the inherent subjectivity of assessments and unpredictability of outcomes of legal proceedings, any amounts accrued may not represent the ultimate loss to us from legal proceedings.

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income/ (Loss)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income/ (Loss)	Changes in Accumulated Other Comprehensive Income/ (Loss) The following table shows the changes in accumulated other comprehensive income by component for the periods indicated (in thousands): For the quarter ended September 30, 2018 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of June 30, 2018 $ (10,693 ) (266 ) (32,134 ) (43,093 ) Other comprehensive income/ (loss) before reclassification adjustments (1,970 ) 192 — (1,778 ) Amounts reclassified from accumulated other comprehensive income (1), (2) (44 ) — 226 182 Net other comprehensive income/ (loss) (2,014 ) 192 226 (1,596 ) Balance as of September 30, 2018 $ (12,707 ) (74 ) (31,908 ) (44,689 ) For the quarter ended September 30, 2017 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of June 30, 2017 $ 2,276 (1,257 ) (26,167 ) (25,148 ) Other comprehensive income before reclassification adjustments (264 ) 258 — (6 ) Amounts reclassified from accumulated other comprehensive income (3), (4) (674 ) — 221 (453 ) Net other comprehensive income (938 ) 258 221 (459 ) Balance as of September 30, 2017 $ 1,338 (999 ) (25,946 ) (25,607 ) (1) Consists of realized gain on securities (gain on sales of investments, net) of $61 , net of tax (income tax expense) of $(17) . (2) Consists of amortization of prior service cost (compensation and employee benefits) of $581 and amortization of net loss (compensation and employee benefits) of $(897) , net of tax (income tax expense) of $90 . (3) Consists of realized gain on securities (gain on sales of investments, net) of $1,043 , net of tax (income tax expense) of $(369) . (4) Consists of amortization of prior service cost (compensation and employee benefits) of $580 and amortization of net loss (compensation and employee benefits) of $(954) , net of tax (income tax expense) of $153 . For the nine months ended September 30, 2018 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of December 31, 2017 $ (4,409 ) (691 ) (26,980 ) (32,080 ) Reclassification due to adoption of ASU No. 2018-02 (991 ) (149 ) (5,606 ) (6,746 ) Other comprehensive income/ (loss) before reclassification adjustments (7,169 ) 766 — (6,403 ) Amounts reclassified from accumulated other comprehensive income (1), (2) (138 ) — 678 540 Net other comprehensive income/ (loss) (7,307 ) 766 678 (5,863 ) Balance as of September 30, 2018 $ (12,707 ) (74 ) (31,908 ) (44,689 ) For the nine months ended September 30, 2017 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of December 31, 2016 $ 395 (1,778 ) (26,608 ) (27,991 ) Other comprehensive income before reclassification adjustments 1,684 779 — 2,463 Amounts reclassified from accumulated other comprehensive income (3), (4) (741 ) — 662 (79 ) Net other comprehensive income 943 779 662 2,384 Balance as of September 30, 2017 $ 1,338 (999 ) (25,946 ) (25,607 ) (1) Consists of realized gains on securities (loss on sales of investments, net) of $192 , net of tax (income tax expense) of $54 . (2) Consists of amortization of prior service cost (compensation and employee benefits) of $1,742 and amortization of net loss (compensation and employee benefits) of $(2,691) , net of tax (income tax expense) of $271 . (3) Consists of realized gains on securities (gain on sales of investments, net) of $1,157 , net of tax (income tax expense) of $(416) . (4) Consists of amortization of prior service cost (compensation and employee benefits) of $1,742 and amortization of net loss (compensation and employee benefits) of $(2,864) , net of tax (income tax expense) of $460 .

Basis of Presentation and Inf_2

Basis of Presentation and Informational Disclosures (Policies)	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Income Taxes - Uncertain Tax Positions	Income Taxes- Uncertain Tax Positions Accounting standards prescribe a comprehensive model for how a company should recognize, measure, present and disclose in its financial statements uncertain tax positions that the company has taken or expects to take on a tax return. A tax benefit from an uncertain position may be recognized only if it is “more likely than not” that the position is sustainable, based on its technical merits. The tax benefit of a qualifying position is the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement with a taxing authority having full knowledge of all relevant information. At September 30, 2018 we had no liability for unrecognized tax benefits. We recognize interest accrued related to: (1) unrecognized tax benefits in other expenses and (2) refund claims in other operating income. We recognize penalties (if any) in other expenses. We are subject to audit by the Internal Revenue Service and any state in which we conduct business for the tax periods ended December 31, 2017 , 2016 and 2015 .
Recently Adopted Accounting Standards and Impact of New Accounting Standards	Recently Adopted Accounting Standards In May 2014 the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “ Revenue from Contracts with Customers (Topic 606) ”. Effective January 1, 2018, we adopted the ASU and all related amendments to all contracts using the modified retrospective approach, with the cumulative effect recorded as an adjustment to opening retained earnings. Due to immateriality, we had no cumulative effect to record. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. We expect the impact of the adoption of the new standard to be immaterial to our net income on an ongoing basis. Our revenue is comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and non-interest income. The services that fall within the scope of ASC 606 include service charges and fees, trust and other financial services income, insurance commission income, sale of OREO and other operating income. Revenue is recognized when performance obligations under the terms of a contract with our customers are satisfied. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. The majority of our revenue continues to be recognized at the point in time when the services are provided to our customers. Service charges and fees represents income earned on both loan and deposit accounts as well as interchange income. Service charges on deposit accounts primarily consist of overdraft, non-sufficient funds, ATM transaction fees and account management fees. Revenue is recognized at the point in time the transaction occurs or the service is provided to the customer. We earn interchange income from debit and credit cardholder transactions processed through payment networks. Interchange fees represent a percentage of the underlying transaction value and are generally set by the credit card associations. Interchange fees are recognized as transactions occur. We provide trust management services and investment management services to our customers and recognize revenue as these management services are provided. Trust and investment management services are billed and paid on a monthly or quarterly basis. Additionally, we earn commissions on investment products that are sold to our customers. These commissions are recognized at the time of the sale of the third party’s product or services to our customers. Our insurance subsidiary is an employee benefits and property and casualty insurance agency specializing in commercial and personal insurance as well as retirement benefit plans. Insurance commission income is earned at the time of sale of the third party’s product or service to our customers. Loss on real estate owned represents gains and losses on real estate acquired by Northwest through the foreclosure process. Proceeds from the sale of these properties are recognized when control of the property transfers to the buyer. In certain instances the Bank may finance a portion of the purchase price paid by the buyer and an additional evaluation of whether all of the contract criteria are met is required. If it is not probable that we will collect substantially all of the consideration expected, the transaction would not be accounted for as a sale until the concerns about collectability are resolved. Other operating income consists primarily of revenues earned for providing transaction services to our deposit customers. The revenue is earned at the point in time the transaction occurs. We have evaluated the nature of our contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Statements of Income was not necessary. In January 2016 the FASB issued ASU 2016-01, “Financial Instruments - Overall (Subtopic 825-10)” . This guidance requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. This guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. We adopted this guidance as of January 1, 2018 which did not have a material impact on our results of operations and financial position. Additionally, this guidance requires entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. Accordingly, we refined the calculation used to determine the disclosed fair value of our loans held for investment portfolio as part of adopting this standard. The refined calculation did not have a significant impact on our fair value disclosures. Refer to note 9, "Disclosures About Fair Value of Financial Instruments". In August 2016, the FASB issued ASU No. 2016-15, “ Classification of Certain Cash Receipts and Cash Payments ”. The main objective of this ASU is to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The amendments in this Update provide guidance on the following eight specific cash flow issues: debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of bank-owned life insurance (BOLI) policies, distributions received from equity method investments, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. This guidance is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. We adopted this guidance as of January 1, 2018 and applied it on a retrospective basis. No material reclassifications were made for the nine months ended September 30, 2017 and we do not expect the reclassifications to be material for the full year. In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment" . This guidance eliminates the requirement to determine the fair value of individual assets and liabilities of a reporting unit to measure goodwill impairment. Under this guidance goodwill impairment testing will be performed by comparing the fair value of the reporting unit with its carrying amount and recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value. This guidance is effective for annual and interim goodwill impairment tests in fiscal years beginning after December 15, 2019, and should be applied on a prospective basis. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017.We have elected to early adopt this standard as of January 1, 2018 and the amendments were applied on a prospective basis. The adoption did not have a material impact on the consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-07, “Compensation Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Costs and Net Periodic Postretirement Benefit Costs ". This guidance provides financial statement users with clearer and disaggregated information related to the components of net periodic benefit cost and improve transparency of the presentation of net periodic benefit cost in the financial statements. Employers will present the service cost component of net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. Employers will present the other components of the net periodic benefit cost separately from the line items that includes the service cost outside of any subtotal of operating income, if one is presented. This guidance is effective for annual and interim periods beginning after December 15, 2017 and should be applied retrospectively. We adopted this standard as of January 1, 2018. The other components of the net periodic benefit cost for the quarter and nine months ended September 30, 2017 totaled $517,000 and $1.6 million , respectively, and were reclassified from compensation and employee benefits to other expense. In February 2018, the FASB issued ASU 2018-02, " Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income." This guidance permits a reclassification from accumulated other comprehensive income to retained earnings of the stranded tax effects resulting from the Tax Cuts and Jobs Act. This guidance is effective for annual or interim reporting periods beginning after December 15, 2018 but permits early adoption in a period for which financial statements have not been issued. We have elected to early adopt the ASU as of January 1, 2018. The reclassification from accumulated other comprehensive income to retained earnings was $6.7 million for the release of stranded income tax benefits relating to the unrealized net gains and losses on available for sale securities and the change in fair value of our interest rate swaps and our pension plan. Our policy for releasing income tax effects from accumulated other comprehensive income is to release them when investments are sold or matured and liabilities are extinguished. Recently Issued Accounting Standards In February 2016, the FASB issued ASU 2016-2, “Leases” . This guidance requires a lessee to recognize in the statement of financial condition a liability to make lease payments and a right-of-use asset representing the right to use the underlying asset for the term of the lease. Optional periods should only be recognized if the lessee is reasonably certain to exercise the option. For leases with a term of twelve months or less, the lessee is permitted not to recognize lease assets and lease liabilities and should recognize lease expense for such leases generally on a straight-line basis over the term of the lease. This guidance is effective for annual periods beginning after December 15, 2018, including interim periods within those years and early adoption is permitted. We lease certain branch and office facilities or land under operating leases. While we are currently evaluating the impact this guidance will have on our results of operations and financial position, we expect the primary impact on the consolidated statement of financial position will be the recognition of right-of-use assets and lease obligations under the ASU as a result of our minimum commitments under non-cancellable operating leases. Our current minimum commitments under non-cancellable operating leases are disclosed in Note 7, “Premises and Equipment” in our Annual Report on Form 10-K for the year ended December 31, 2017. We expect to apply the package of practical expedients included therein, as well as utilize the transition method included in ASU 2018-11. By applying ASU 2016-02 at the adoption date, as opposed to at the beginning of the earliest period presented, our reporting for periods prior to January 1, 2019 will continue to be in accordance with Leases (Topic 840) . In June 2016, the FASB issued ASU 2016-13, " Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments" , which eliminates the probable initial recognition threshold for credit losses and instead requires that all financial assets (or group of financial assets) measured at amortized cost be presented at the net amount expected to be collected inclusive of the entity’s current estimate of all lifetime expected credit losses. This guidance also applies to certain off-balance-sheet credit exposures such as unfunded commitments and non-derivative financial guarantees. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial assets in order to present the net carrying value at the amount expected to be collected on the financial asset. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The income statement under this guidance will reflect the initial recognition of current expected credit losses for newly recognized assets, as well as any increases or decreases of expected credit losses that have occurred during the period. This guidance retains many currently-existing disclosures related to the credit quality of an entity’s assets and the related allowance for credit losses amended to reflect the change to an expected credit loss methodology, as well as enhanced disclosures to provide information to users at a more disaggregated level. Upon adoption, ASU 2016-13 provides for a modified retrospective transition by means of a cumulative-effect adjustment to equity as of the beginning of the period in which the guidance is effective, except for debt securities for which other-than-temporary impairment has previously been recognized. For these debt securities, a prospective transition is provided in order to maintain the same amortized cost prior to and subsequent to the effective date of the ASU. This guidance is effective for annual reporting periods beginning after December 15, 2019, and interim periods within those annual periods with early adoption permitted for fiscal years beginning after December 15, 2018, and interim periods within those annual periods. Management created a formal working group to govern the implementation of these amendments consisting of key stakeholders from finance, risk, credit and accounting. We are currently in the process of designing current expected credit loss estimation methodologies and systems, and collecting data to be able to comply with the standard. We have partnered with a third-party to assist in the development of certain portfolio-level estimation methodologies and have chosen a third-party software platform provider. We are also evaluating the effect this guidance will have on our results of operations, financial position and related disclosures. The impact of the ASU will depend upon the state of the economy and the nature of our portfolios, among other items, at the date of adoption. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820) - Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement.” This guidance removes, modifies and adds disclosure requirements for fair value measurements. This guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those years, with early adoption permitted for any removed or modified disclosure requirements. Transition is on a prospective basis for the new and modified disclosures, and on a retrospective basis for disclosures that have been eliminated. We do not expect this guidance to have a material impact on our financial statements. In August 2018, the FASB issued ASU 2018-14, “ Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20) - Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans.” This guidance removes and adds disclosure requirements for defined benefit pension or other post-retirement plans. This guidance is effective for annual periods beginning after December 15, 2020, with early adoption permitted, and requires retrospective adoption for all periods presented. We do not expect this guidance to have a material impact on our financial statements. In August 2018, the FASB issued ASU 2018-15, “ Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40)-Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” This guidance aligns the requirements for capitalization of implementation costs incurred in a hosting arrangement that is a service contract with the existing guidance for internal-use software. This guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those years, with early adoption permitted. Transition can either be on a retrospective basis or a prospective basis on all implementation costs incurred after the date of adoption. We are evaluating the impact this new accounting guidance will have on our financial statements.

Investment securities and imp_2

Investment securities and impairment of investment securities (Tables)	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of the portfolio of investment securities available-for-sale	The following table shows the portfolio of investment securities available-for-sale at September 30, 2018 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Debt issued by the U.S. government and agencies: Due after one year through five years $ 14,707 — (12 ) 14,695 Debt issued by government sponsored enterprises: Due in one year or less 70,096 — (895 ) 69,201 Due after one year through five years 116,097 — (2,560 ) 113,537 Due after ten years 3,822 — (115 ) 3,707 Municipal securities: Due in one year or less 2,351 3 (7 ) 2,347 Due after one year through five years 3,553 43 (11 ) 3,585 Due after five years through ten years 11,714 46 (23 ) 11,737 Due after ten years 7,073 31 (29 ) 7,075 Corporate debt issues: Due after five years through ten years 912 — — 912 Residential mortgage-backed securities: Fixed rate pass-through 131,255 514 (5,689 ) 126,080 Variable rate pass-through 26,374 1,064 (5 ) 27,433 Fixed rate non-agency CMOs — — — — Fixed rate agency CMOs 374,900 5 (10,595 ) 364,310 Variable rate agency CMOs 66,491 467 (21 ) 66,937 Total residential mortgage-backed securities 599,020 2,050 (16,310 ) 584,760 Total marketable securities available-for-sale $ 829,345 2,173 (19,962 ) 811,556 The following table shows the portfolio of investment securities available-for-sale at December 31, 2017 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Debt issued by the U.S. government and agencies: Due in one year or less $ 1 — — 1 Debt issued by government sponsored enterprises: Due in one year or less 66,566 14 (289 ) 66,291 Due after one year through five years 140,624 — (2,402 ) 138,222 Due after ten years 4,833 — (77 ) 4,756 Equity securities 551 29 (6 ) 574 Municipal securities: Due in one year or less 2,492 7 (1 ) 2,498 Due after one year through five years 7,072 82 (6 ) 7,148 Due after five years through ten years 14,576 171 — 14,747 Due after ten years 26,371 292 — 26,663 Corporate debt issues: Due after ten years 909 — — 909 Residential mortgage-backed securities: Fixed rate pass-through 144,411 1,108 (2,817 ) 142,702 Variable rate pass-through 33,079 1,464 (6 ) 34,537 Fixed rate non-agency CMOs 15 — — 15 Fixed rate agency CMOs 284,320 37 (5,271 ) 279,086 Variable rate agency CMOs 74,274 249 (137 ) 74,386 Total residential mortgage-backed securities 536,099 2,858 (8,231 ) 530,726 Total marketable securities available-for-sale $ 800,094 3,453 (11,012 ) 792,535
Schedule of the portfolio of investment securities held-to-maturity	The following table shows the portfolio of investment securities held-to-maturity at September 30, 2018 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through $ 3,027 44 — 3,071 Variable rate pass-through 1,778 39 — 1,817 Fixed rate agency CMOs 18,753 — (782 ) 17,971 Variable rate agency CMOs 664 11 — 675 Total residential mortgage-backed securities 24,222 94 (782 ) 23,534 Total marketable securities held-to-maturity $ 24,222 94 (782 ) 23,534 The following table shows the portfolio of investment securities held-to-maturity at December 31, 2017 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through $ 3,760 140 — 3,900 Variable rate pass-through 2,283 64 — 2,347 Fixed rate agency CMOs 22,906 20 (248 ) 22,678 Variable rate agency CMOs 729 13 — 742 Total residential mortgage-backed securities 29,678 237 (248 ) 29,667 Total marketable securities held-to-maturity $ 29,678 237 (248 ) 29,667
Schedule of the fair value and gross unrealized losses on investment securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position	The following table shows the fair value of and gross unrealized losses on investment securities, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position at September 30, 2018 (in thousands): Less than 12 months 12 months or more Total Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss U.S. government sponsored enterprises $ 55,650 (210 ) 130,795 (3,360 ) 186,445 (3,570 ) Municipal securities 9,025 (70 ) — — 9,025 (70 ) Residential mortgage-backed securities - agency 176,316 (2,095 ) 329,287 (14,997 ) 505,603 (17,092 ) U.S. government and agencies 14,695 (12 ) — — 14,695 (12 ) Total temporarily impaired securities $ 255,686 (2,387 ) 460,082 (18,357 ) 715,768 (20,744 ) The following table shows the fair value of and gross unrealized losses on investment securities, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position at December 31, 2017 (in thousands): Less than 12 months 12 months or more Total Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss U.S. government sponsored enterprises $ 5,006 (7 ) 197,695 (2,761 ) 202,701 (2,768 ) Equity Securities — — 544 (6 ) 544 (6 ) Municipal Securities 4,563 (7 ) — — 4,563 (7 ) Residential mortgage-backed securities - agency 239,703 (2,522 ) 202,344 (5,957 ) 442,047 (8,479 ) Total temporarily impaired securities $ 249,272 (2,536 ) 400,583 (8,724 ) 649,855 (11,260 )
Schedule of the cumulative roll forward of credit losses recognized in earnings for debt securities held and not intended to be sold	The table below shows a cumulative roll forward of credit losses recognized in earnings for debt securities held and not intended to be sold for the quarter and nine months ended September 30, : 2018 2017 Beginning balance at July 1, (1) $ — 7,942 Credit losses on debt securities for which other-than-temporary impairment was not previously recognized — — Reduction for securities sold/ called realized during the quarter — — Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized — — Ending balance at September 30, $ — 7,942 2018 2017 Beginning balance at January 1, (1) $ 352 7,942 Credit losses on debt securities for which other-than-temporary impairment was not previously recognized — — Reduction for losses realized during the quarter (352 ) — Reduction for securities sold/ called realized during the nine months — — Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized — — Ending balance at September 30, $ — 7,942 (1) The beginning balance represents credit losses included in other-than-temporary impairment charges recognized on debt securities in prior periods.

Loans receivable (Tables)

Loans receivable (Tables)	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Summary of loans receivable	The following table shows a summary of our loans receivable at September 30, 2018 and December 31, 2017 (in thousands): September 30, December 31, Originated Acquired Total Originated Acquired Total Personal Banking: Residential mortgage loans (1) $ 2,745,190 97,822 2,843,012 2,658,726 113,823 2,772,549 Home equity loans 1,048,373 223,972 1,272,345 1,051,558 258,797 1,310,355 Consumer finance loans (2) 5,888 — 5,888 18,619 — 18,619 Consumer loans 685,252 66,284 751,536 540,832 97,877 638,709 Total Personal Banking 4,484,703 388,078 4,872,781 4,269,735 470,497 4,740,232 Commercial Banking: Commercial real estate loans 2,477,581 241,307 2,718,888 2,303,179 296,161 2,599,340 Commercial loans 594,939 51,164 646,103 572,341 60,822 633,163 Total Commercial Banking 3,072,520 292,471 3,364,991 2,875,520 356,983 3,232,503 Total loans receivable, gross 7,557,223 680,549 8,237,772 7,145,255 827,480 7,972,735 Deferred loan costs 32,846 936 33,782 26,255 1,527 27,782 Allowance for loan losses (51,473 ) (4,502 ) (55,975 ) (50,572 ) (6,223 ) (56,795 ) Undisbursed loan proceeds: Residential mortgage loans (11,335 ) — (11,335 ) (10,067 ) — (10,067 ) Commercial real estate loans (200,152 ) (670 ) (200,822 ) (141,967 ) (2,647 ) (144,614 ) Commercial loans (62,175 ) (1,160 ) (63,335 ) (51,143 ) (1,284 ) (52,427 ) Total loans receivable, net $ 7,264,934 675,153 7,940,087 6,917,761 818,853 7,736,614 (1) Includes $0 and $3.1 million of loans held for sale at September 30, 2018 and December 31, 2017 , respectively. (2) Represents loans from our consumer finance subsidiary that was closed in 2017, which are no longer being originated.
Schedule of information related to the outstanding principal balance and related carrying value of acquired loans	The following table provides information related to the outstanding principal balance and related carrying value of acquired loans for the dates indicated (in thousands): September 30, December 31, Acquired loans evaluated individually for future credit losses: Outstanding principal balance $ 8,446 9,735 Carrying value 5,871 6,875 Acquired loans evaluated collectively for future credit losses: Outstanding principal balance 678,540 824,205 Carrying value 673,784 818,201 Total acquired loans: Outstanding principal balance 686,986 833,940 Carrying value 679,655 825,076
Schedule of the changes in the accretable discount	The following table provides information related to the changes in the accretable discount, which includes income recognized from contractual cash flows for the dates indicated (in thousands): Total Balance at December 31, 2016 $ 2,187 Accretion (1,318 ) Net reclassification from nonaccretable yield 671 Balance at December 31, 2017 1,540 Accretion (588 ) Net reclassification from nonaccretable yield — Balance at September 30, 2018 $ 952
Schedule of the composition of impaired loans by portfolio segment and by class of financing receivable	The following table provides information related to the composition of originated impaired loans by portfolio segment and by class of financing receivable at and for the nine months ended September 30, 2018 (in thousands): Nonaccrual loans 90 or more days delinquent Nonaccrual loans less than 90 days delinquent Loans less than 90 days delinquent reviewed for impairment TDRs less than 90 days delinquent not included elsewhere Total impaired loans Average recorded investment in impaired loans Interest income recognized on impaired loans Personal Banking: Residential mortgage loans $ 13,154 1,431 505 6,349 21,439 20,499 659 Home equity loans 5,838 1,247 — 1,812 8,897 9,250 375 Consumer finance loan 39 — — — 39 25 4 Consumer loans 3,535 772 — — 4,307 3,835 166 Total Personal Banking 22,566 3,450 505 8,161 34,682 33,609 1,204 Commercial Banking: Commercial real estate loans 27,122 15,901 22,583 5,114 70,720 39,985 1,195 Commercial loans 2,714 2,474 223 2,305 7,716 8,910 392 Total Commercial Banking 29,836 18,375 22,806 7,419 78,436 48,895 1,587 Total $ 52,402 21,825 23,311 15,580 113,118 82,504 2,791 The following table provides information related to the composition of originated impaired loans by portfolio segment and by class of financing receivable at and for the year ended December 31, 2017 (in thousands): Nonaccrual loans 90 or more days delinquent Nonaccrual loans less than 90 days delinquent Loans less than 90 days delinquent reviewed for impairment TDRs less than 90 days delinquent not included elsewhere Total impaired loans Average recorded investment in impaired loans Interest income recognized on impaired loans Personal Banking: Residential mortgage loans $ 13,509 1,282 — 6,814 21,605 21,531 892 Home equity loans 7,251 1,656 — 1,449 10,356 9,150 452 Consumer finance loans 199 — — — 199 379 20 Consumer loans 3,617 1,056 — — 4,673 4,042 188 Total Personal Banking 24,576 3,994 — 8,263 36,833 35,102 1,552 Commercial Banking: Commercial real estate loans 15,361 13,112 4,431 4,123 37,027 49,981 1,758 Commercial loans 3,140 4,272 906 2,447 10,765 12,110 672 Total Commercial Banking 18,501 17,384 5,337 6,570 47,792 62,091 2,430 Total $ 43,077 21,378 5,337 14,833 84,625 97,193 3,982 The following table provides information related to acquired impaired loans by portfolio segment and by class of financing receivable at and for the nine months ended September 30, 2018 (in thousands): Carrying value Outstanding principal balance Related impairment reserve Average recorded investment in impaired loans Interest income recognized Personal Banking: Residential mortgage loans $ 1,099 1,741 13 1,140 135 Home equity loans 1,019 1,977 7 1,081 127 Consumer loans 32 95 4 46 31 Total Personal Banking 2,150 3,813 24 2,267 293 Commercial Banking: Commercial real estate loans 3,643 4,548 1 4,015 287 Commercial loans 78 85 — 91 8 Total Commercial Banking 3,721 4,633 1 4,106 295 Total $ 5,871 8,446 25 6,373 588 The following table provides information related to acquired impaired loans by portfolio segment and by class of financing receivable at and for the year ended December 31, 2017 (in thousands): Carrying Outstanding Related Average Interest Personal Banking: Residential mortgage loans $ 1,182 1,880 24 1,251 181 Home equity loans 1,143 2,219 21 1,253 157 Consumer loans 59 160 4 97 51 Total Personal Banking 2,384 4,259 49 2,601 389 Commercial Banking: Commercial real estate loans 4,388 5,363 39 6,992 914 Commercial loans 103 113 — 177 15 Total Commercial Banking 4,491 5,476 39 7,169 929 Total $ 6,875 9,735 88 9,770 1,318
Schedule of the changes in the allowance for losses on loans receivable	The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the nine months ended September 30, 2018 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 4,144 678 (710 ) 352 3,824 Home equity loans 3,234 (164 ) (866 ) 192 4,072 Consumer finance loans 1,650 (469 ) (2,484 ) 635 3,968 Other consumer loans 11,021 9,845 (9,192 ) 1,893 8,475 Total Personal Banking 20,049 9,890 (13,252 ) 3,072 20,339 Commercial Banking: Commercial real estate loans 25,694 10,417 (5,702 ) 1,068 19,911 Commercial loans 5,730 (2,912 ) (2,053 ) 373 10,322 Total Commercial Banking 31,424 7,505 (7,755 ) 1,441 30,233 Total originated loans 51,473 17,395 (21,007 ) 4,513 50,572 Acquired loans: Personal Banking: Residential mortgage loans 102 (38 ) (94 ) 103 131 Home equity loans 408 85 (578 ) 139 762 Other consumer loans 444 (363 ) (209 ) 126 890 Total Personal Banking 954 (316 ) (881 ) 368 1,783 Commercial Banking: Commercial real estate loans 2,876 (688 ) (147 ) 162 3,549 Commercial loans 672 149 (448 ) 80 891 Total Commercial Banking 3,548 (539 ) (595 ) 242 4,440 Total acquired loans 4,502 (855 ) (1,476 ) 610 6,223 Total $ 55,975 16,540 (22,483 ) 5,123 56,795 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the nine months ended September 30, 2017 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 3,986 (278 ) (678 ) 286 4,656 Home equity loans 3,295 503 (803 ) 109 3,486 Consumer finance loans 4,876 6,610 (5,469 ) 290 3,445 Other consumer loans 7,383 9,741 (7,912 ) 1,025 4,529 Total Personal Banking 19,540 16,576 (14,862 ) 1,710 16,116 Commercial Banking: Commercial real estate loans 20,174 (3,988 ) (498 ) 993 23,667 Commercial loans 11,131 (3,517 ) (1,858 ) 996 15,510 Total Commercial Banking 31,305 (7,505 ) (2,356 ) 1,989 39,177 Total originated loans 50,845 9,071 (17,218 ) 3,699 55,293 Acquired loans: Personal Banking: Residential mortgage loans 77 130 (199 ) 75 71 Home equity loans 748 512 (1,063 ) 252 1,047 Other consumer loans 594 405 (689 ) 225 653 Total Personal Banking 1,419 1,047 (1,951 ) 552 1,771 Commercial Banking: Commercial real estate loans 3,301 1,832 (2,206 ) 667 3,008 Commercial loans 1,362 1,276 (847 ) 66 867 Total Commercial Banking 4,663 3,108 (3,053 ) 733 3,875 Total acquired loans 6,082 4,155 (5,004 ) 1,285 5,646 Total $ 56,927 13,226 (22,222 ) 4,984 60,939 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the quarter ended September 30, 2018 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 4,144 491 (204 ) 200 3,657 Home equity loans 3,234 (351 ) (323 ) 69 3,839 Consumer finance loans 1,650 (437 ) (445 ) 178 2,354 Consumer loans 11,021 4,023 (3,392 ) 630 9,760 Total Personal Banking 20,049 3,726 (4,364 ) 1,077 19,610 Commercial Banking: Commercial real estate loans 25,694 8,723 (4,820 ) 772 21,019 Commercial loans 5,730 (3,945 ) (914 ) 80 10,509 Total Commercial Banking 31,424 4,778 (5,734 ) 852 31,528 Total originated loans 51,473 8,504 (10,098 ) 1,929 51,138 Acquired loans: Personal Banking: Residential mortgage loans 102 (70 ) (10 ) 12 170 Home equity loans 408 (173 ) (103 ) 22 662 Consumer loans 444 (448 ) (78 ) 55 915 Total Personal Banking 954 (691 ) (191 ) 89 1,747 Commercial Banking: Commercial real estate loans 2,876 (532 ) (39 ) 25 3,422 Commercial loans 672 (299 ) (71 ) 17 1,025 Total Commercial Banking 3,548 (831 ) (110 ) 42 4,447 Total acquired loans 4,502 (1,522 ) (301 ) 131 6,194 Total $ 55,975 6,982 (10,399 ) 2,060 57,332 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the quarter ended September 30, 2017 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 3,986 (462 ) (211 ) 24 4,635 Home equity loans 3,295 615 (285 ) 8 2,957 Consumer finance loans 4,876 4,220 (3,891 ) 80 4,467 Consumer loans 7,383 4,594 (2,844 ) 353 5,280 Total Personal Banking 19,540 8,967 (7,231 ) 465 17,339 Commercial Banking: Commercial real estate loans 20,174 (2,529 ) (163 ) 282 22,584 Commercial loans 11,131 (5,445 ) (204 ) 76 16,704 Total Commercial Banking 31,305 (7,974 ) (367 ) 358 39,288 Total originated loans 50,845 993 (7,598 ) 823 56,627 Acquired loans: Personal Banking: Residential mortgage loans 77 (11 ) (4 ) 7 85 Home equity loans 748 324 (243 ) 44 623 Consumer loans 594 106 (158 ) 18 628 Total Personal Banking 1,419 419 (405 ) 69 1,336 Commercial Banking: Commercial real estate loans 3,301 2,433 (1,738 ) 160 2,446 Commercial loans 1,362 (818 ) (305 ) 9 2,476 Total Commercial Banking 4,663 1,615 (2,043 ) 169 4,922 Total acquired loans 6,082 2,034 (2,448 ) 238 6,258 Total $ 56,927 3,027 (10,046 ) 1,061 62,885
Schedule of loan portfolio by portfolio segment and by class of financing receivable	The following table provides information related to the loan portfolio by portfolio segment and by class of financing receivable at September 30, 2018 (in thousands): Total loans receivable Allowance for loan losses Nonaccrual loans (1) Loans past due 90 days or more and still accruing (2) TDRs Allowance related to TDRs Additional commitments to customers with loans classified as TDRs Personal Banking: Residential mortgage loans $ 2,846,834 4,246 14,585 — 7,668 778 — Home equity loans 1,272,345 3,642 7,085 72 2,061 497 4 Consumer finance loans 5,888 1,650 39 — — — — Consumer loans 770,161 11,465 4,307 123 — — — Total Personal Banking 4,895,228 21,003 26,016 195 9,729 1,275 4 Commercial Banking: Commercial real estate loans 2,518,066 28,570 43,023 — 15,667 1,516 208 Commercial loans 582,768 6,402 5,188 — 3,751 276 209 Total Commercial Banking 3,100,834 34,972 48,211 — 19,418 1,792 417 Total $ 7,996,062 55,975 74,227 195 29,147 3,067 421 (1) Includes $9.8 million of nonaccrual TDRs. (2) Represents loans 90 days or more past maturity and still accruing. The following table provides information related to the loan portfolio by portfolio segment and by class of financing receivable at December 31, 2017 (in thousands): Total loans receivable Allowance for loan losses Nonaccrual loans (1) Loans past due 90 days or more and still accruing (2) TDRs Allowance related to TDRs Additional commitments to customers with loans classified as TDRs Personal Banking: Residential mortgage loans $ 2,776,203 3,955 14,791 — 8,000 815 — Home equity loans 1,310,355 4,834 8,907 120 1,716 462 4 Consumer finance loans 18,619 3,968 199 3 — — — Consumer loans 652,770 9,365 4,673 379 — — — Total Personal Banking 4,757,947 22,122 28,570 502 9,716 1,277 4 Commercial Banking: Commercial real estate loans 2,454,726 23,460 28,473 — 15,691 1,125 235 Commercial loans 580,736 11,213 7,412 — 6,697 742 8 Total Commercial Banking 3,035,462 34,673 35,885 — 22,388 1,867 243 Total $ 7,793,409 56,795 64,455 502 32,104 3,144 247 (1) Includes $12.3 million of nonaccrual TDRs. (2) Represents loans 90 days or more past maturity and still accruing.
Schedule of the evaluation of impaired loans by portfolio segment and by class of financing receivable	The following table provides information related to the evaluation of impaired loans by portfolio segment and by class of financing receivable at September 30, 2018 (in thousands): Loans collectively evaluated for impairment Loans individually evaluated for impairment Loans individually evaluated for impairment for which there is a related impairment reserve Related impairment reserve Loans individually evaluated for impairment for which there is no related reserve Personal Banking: Residential mortgage loans $ 2,838,600 8,234 8,234 795 — Home equity loans 1,270,284 2,061 2,061 497 — Consumer finance loans 5,888 — — — — Consumer loans 770,125 36 36 7 — Total Personal Banking 4,884,897 10,331 10,331 1,299 — Commercial Banking: Commercial real estate loans 2,462,663 55,403 27,924 2,877 27,479 Commercial loans 577,023 5,745 4,328 475 1,417 Total Commercial Banking 3,039,686 61,148 32,252 3,352 28,896 Total $ 7,924,583 71,479 42,583 4,651 28,896 The following table provides information related to the evaluation of impaired loans by portfolio segment and by class of financing receivable at December 31, 2017 (in thousands): Loans collectively evaluated for impairment Loans individually evaluated for impairment Loans individually evaluated for impairment for which there is a related impairment reserve Related impairment reserve Loans individually evaluated for impairment for which there is no related reserve Personal Banking: Residential mortgage loans $ 2,767,635 8,568 8,568 816 — Home equity loans 1,308,639 1,716 1,716 461 — Consumer finance loans 18,619 — — — — Consumer loans 652,685 85 85 25 — Total Personal Banking 4,747,578 10,369 10,369 1,302 — Commercial Banking: Commercial real estate loans 2,433,755 20,971 18,470 1,859 2,501 Commercial loans 571,412 9,324 8,572 829 752 Total Commercial Banking 3,005,167 30,295 27,042 2,688 3,253 Total $ 7,752,745 40,664 37,411 3,990 3,253
Schedule of roll forward of troubled debt restructurings	The following table provides a roll forward of troubled debt restructurings for the periods indicated (dollars in thousands): For the quarter ended September 30, 2018 2017 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 205 $ 30,662 203 $ 41,860 New TDRs 7 647 6 546 Re-modified TDRs 3 306 2 265 Net paydowns (1,215 ) (987 ) Charge-offs: Residential mortgage loans — — — — Home equity loans — — — — Commercial real estate loans 1 (91 ) 2 (2,498 ) Commercial loans 5 (619 ) — — Paid-off loans: Residential mortgage loans 2 (2 ) — — Home equity loans 2 (12 ) 3 (30 ) Commercial real estate loans 2 (360 ) 1 (564 ) Commercial loans 3 (169 ) 2 (123 ) Ending TDR balance: 197 $ 29,147 201 $ 38,469 Accruing TDRs $ 19,370 $ 20,660 Non-accrual TDRs 9,777 17,809 The following table provides a roll forward of troubled debt restructurings for the periods indicated (dollars in thousands): For the nine months ended September 30, 2018 2017 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 205 $ 32,104 225 $ 42,926 New TDRs 26 6,443 13 4,685 Re-modified TDRs 3 306 3 710 Net paydowns (3,037 ) (3,668 ) Charge-offs: Residential mortgage loans 1 (135 ) — — Home equity loans — — — — Commercial real estate loans 2 (294 ) 2 (2,498 ) Commercial loans 6 (1,340 ) 6 (259 ) Paid-off loans: Residential mortgage loans 4 (257 ) — — Home equity loans 4 (59 ) 8 (62 ) Commercial real estate loans 9 (2,183 ) 11 (1,109 ) Commercial loans 8 (2,401 ) 10 (2,256 ) Ending TDR balance: 197 $ 29,147 201 $ 38,469 Accruing TDRs $ 19,370 $ 20,660 Non-accrual TDRs 9,777 17,809
Schedule of troubled debt restructurings (including re-modified TDRs) by portfolio segment and by class of financing receivable	The following tables provide information related to troubled debt restructurings (including re-modified TDRs) by portfolio segment and by class of financing receivable during the periods indicated (dollars in thousands): For the quarter ended For the nine months ended Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Troubled debt restructurings: Personal Banking: Residential mortgage loans 2 $ 342 342 35 6 $ 616 612 62 Home equity loans 4 194 193 47 12 511 462 113 Total Personal Banking 6 536 535 82 18 1,127 1,074 175 Commercial Banking: Commercial real estate loans 3 372 361 42 5 3,255 3,198 97 Commercial loans 1 45 45 5 6 2,367 1,484 21 Total Commercial Banking 4 417 406 47 11 5,622 4,682 118 Total 10 $ 953 941 129 29 $ 6,749 5,756 293 During the quarter and nine months ended September 30, 2018 , no TDRs modified within the previous twelve months have subsequently defaulted. The following tables provide information related to troubled debt restructurings (including re-modified TDRs) by portfolio segment and by class of financing receivable during the periods indicated (dollars in thousands): For the quarter ended For the nine months ended Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Troubled debt restructurings: Personal Banking: Residential mortgage loans 2 $ 403 402 40 5 $ 1,297 1,276 128 Home equity loans 2 122 119 30 2 122 119 30 Total Personal Banking 4 525 521 70 7 1,419 1,395 158 Commercial Banking: Commercial real estate loans 2 114 116 13 6 3,600 3,282 285 Commercial loans 2 172 170 71 3 376 352 84 Total Commercial Banking 4 286 286 84 9 3,976 3,634 369 Total 8 $ 811 807 154 16 $ 5,395 5,029 527 Troubled debt restructurings modified within the previous twelve months that have subsequently defaulted: Personal Banking: Residential mortgage loans — $ — — — — $ — — — Home equity loans — — — — — — — — Total Personal Banking — — — — — — — — Commercial Banking: Commercial real estate loans 1 90 90 11 1 90 90 11 Commercial loans 1 150 150 70 1 150 150 70 Total Commercial Banking 2 240 240 81 2 240 240 81 Total 2 $ 240 240 81 2 $ 240 240 81
Schedule of troubled debt restructurings (including re-modified TDRs) by type of modification by portfolio segment and by class of financing receivable	The following table provides information as of September 30, 2018 for troubled debt restructurings (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended September 30, 2018 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 2 $ — — 342 342 Home equity loans 4 193 — — 193 Total Personal Banking 6 193 — 342 — 535 Commercial Banking: Commercial real estate loans 3 — — 361 361 Commercial loans 1 — — 45 45 Total Commercial Banking 4 — — 406 — 406 Total 10 $ 193 — 748 — 941 The following table provides information as of September 30, 2017 for troubled debt restructurings (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended September 30, 2017 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 2 $ 250 — — 152 402 Home equity loans 2 119 — — — 119 Total Personal Banking 4 369 — — 152 521 Commercial Banking: Commercial real estate loans 2 — — 116 — 116 Commercial loans 2 — — 170 — 170 Total Commercial Banking 4 — — 286 — 286 Total 8 $ 369 — 286 152 807 The following table provides information as of September 30, 2018 for troubled debt restructurings (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the nine months ended September 30, 2018 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 6 $ 7 — 519 86 612 Home equity loans 12 222 — 47 193 462 Total Personal Banking 18 229 — 566 279 1,074 Commercial Banking: Commercial real estate loans 5 — 482 361 2,355 3,198 Commercial loans 6 — — 183 1,301 1,484 Total Commercial Banking 11 — 482 544 3,656 4,682 Total 29 $ 229 482 1,110 3,935 5,756 The following table provides information as of September 30, 2017 for troubled debt restructurings (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the nine months ended September 30, 2017 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 5 $ 360 — — 916 1,276 Home equity loans 2 119 — — — 119 Total Personal Banking 7 479 — — 916 1,395 Commercial Banking: Commercial real estate loans 6 — 2,710 572 — 3,282 Commercial loans 3 — — 352 — 352 Total Commercial Banking 9 — 2,710 924 — 3,634 Total 16 $ 479 2,710 924 916 5,029
Schedule of re-modified troubled debt restructurings by portfolio segment and by class of financing receivable	The following table provides information related to loan payment delinquencies at September 30, 2018 (in thousands): 30-59 Days delinquent 60-89 Days delinquent 90 Days or greater delinquent Total delinquency Current Total loans receivable 90 Days or greater delinquent and accruing (1) Originated loans: Personal Banking: Residential mortgage loans $ 1,404 4,392 11,695 17,491 2,731,521 2,749,012 — Home equity loans 4,622 2,118 5,013 11,753 1,036,620 1,048,373 — Consumer finance loans 632 234 39 905 4,983 5,888 — Consumer loans 7,893 3,032 3,166 14,091 688,850 702,941 — Total Personal Banking 14,551 9,776 19,913 44,240 4,461,974 4,506,214 — Commercial Banking: Commercial real estate loans 2,329 5,370 21,771 29,470 2,247,959 2,277,429 — Commercial loans 340 807 2,112 3,259 529,505 532,764 — Total Commercial Banking 2,669 6,177 23,883 32,729 2,777,464 2,810,193 — Total originated loans 17,220 15,953 43,796 76,969 7,239,438 7,316,407 — Acquired loans: Personal Banking: Residential mortgage loans 96 312 1,788 2,196 95,626 97,822 329 Home equity loans 1,051 418 825 2,294 221,678 223,972 — Consumer loans 515 219 375 1,109 66,111 67,220 6 Total Personal Banking 1,662 949 2,988 5,599 383,415 389,014 335 Commercial Banking: Commercial real estate loans 3,057 1,308 5,457 9,822 230,815 240,637 106 Commercial loans 282 297 602 1,181 48,823 50,004 — Total Commercial Banking 3,339 1,605 6,059 11,003 279,638 290,641 106 Total acquired loans 5,001 2,554 9,047 16,602 663,053 679,655 441 Total loans $ 22,221 18,507 52,843 93,571 7,902,491 7,996,062 441 (1) Represents acquired loans that were originally recorded at fair value upon acquisition. These loans are considered to be accruing because we can reasonably estimate future cash flows on and expect to fully collect the carrying value of these loans. Therefore, we are accreting the difference between the carrying value and their expected cash flows into interest income.
Schedule of loan delinquencies	The following table provides information related to loan payment delinquencies at September 30, 2018 (in thousands): 30-59 Days delinquent 60-89 Days delinquent 90 Days or greater delinquent Total delinquency Current Total loans receivable 90 Days or greater delinquent and accruing (1) Originated loans: Personal Banking: Residential mortgage loans $ 1,404 4,392 11,695 17,491 2,731,521 2,749,012 — Home equity loans 4,622 2,118 5,013 11,753 1,036,620 1,048,373 — Consumer finance loans 632 234 39 905 4,983 5,888 — Consumer loans 7,893 3,032 3,166 14,091 688,850 702,941 — Total Personal Banking 14,551 9,776 19,913 44,240 4,461,974 4,506,214 — Commercial Banking: Commercial real estate loans 2,329 5,370 21,771 29,470 2,247,959 2,277,429 — Commercial loans 340 807 2,112 3,259 529,505 532,764 — Total Commercial Banking 2,669 6,177 23,883 32,729 2,777,464 2,810,193 — Total originated loans 17,220 15,953 43,796 76,969 7,239,438 7,316,407 — Acquired loans: Personal Banking: Residential mortgage loans 96 312 1,788 2,196 95,626 97,822 329 Home equity loans 1,051 418 825 2,294 221,678 223,972 — Consumer loans 515 219 375 1,109 66,111 67,220 6 Total Personal Banking 1,662 949 2,988 5,599 383,415 389,014 335 Commercial Banking: Commercial real estate loans 3,057 1,308 5,457 9,822 230,815 240,637 106 Commercial loans 282 297 602 1,181 48,823 50,004 — Total Commercial Banking 3,339 1,605 6,059 11,003 279,638 290,641 106 Total acquired loans 5,001 2,554 9,047 16,602 663,053 679,655 441 Total loans $ 22,221 18,507 52,843 93,571 7,902,491 7,996,062 441 (1) Represents acquired loans that were originally recorded at fair value upon acquisition. These loans are considered to be accruing because we can reasonably estimate future cash flows on and expect to fully collect the carrying value of these loans. Therefore, we are accreting the difference between the carrying value and their expected cash flows into interest income. The following table provides information related to loan payment delinquencies at December 31, 2017 (in thousands): 30-59 Days delinquent 60-89 Days delinquent 90 Days or greater delinquent Total delinquency Current Total loans receivable 90 Days or Originated loans: Personal Banking: Residential mortgage loans $ 23,786 6,030 12,613 42,429 2,619,951 2,662,380 — Home equity loans 6,094 2,333 6,043 14,470 1,037,088 1,051,558 — Consumer finance loans 2,128 1,113 199 3,440 15,179 18,619 — Consumer loans 9,762 2,834 3,274 15,870 537,496 553,366 — Total Personal Banking 41,770 12,310 22,129 76,209 4,209,714 4,285,923 — Commercial Banking: Commercial real estate loans 5,520 2,133 10,629 18,282 2,142,930 2,161,212 — Commercial loans 1,469 204 2,806 4,479 516,719 521,198 — Total Commercial Banking 6,989 2,337 13,435 22,761 2,659,649 2,682,410 — Total originated loan 48,759 14,647 35,564 98,970 6,869,363 6,968,333 — Acquired loans: Personal Banking: Residential mortgage loans 1,998 205 1,277 3,480 110,343 113,823 381 Home equity loans 1,367 538 1,306 3,211 255,586 258,797 98 Consumer loans 1,150 517 353 2,020 97,384 99,404 10 Total Personal Banking 4,515 1,260 2,936 8,711 463,313 472,024 489 Commercial Banking: Commercial real estate loans 2,795 406 5,655 8,856 284,658 293,514 923 Commercial loans 396 237 334 967 58,571 59,538 — Total Commercial Banking 3,191 643 5,989 9,823 343,229 353,052 923 Total acquired loan 7,706 1,903 8,925 18,534 806,542 825,076 1,412 Total $ 56,465 16,550 44,489 117,504 7,675,905 7,793,409 1,412 (1) Represents acquired loans that were originally recorded at fair value upon acquisition. These loans are considered to be accruing because we can reasonably estimate future cash flows and expect to fully collect the carrying value of these loans. Therefore, we are accreting the difference between the carrying value and their expected cash flows into interest income.
Schedule of credit quality indicators	The following table sets forth information about credit quality indicators updated during the quarter ended September 30, 2018 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans: Personal Banking: Residential mortgage loans $ 2,739,243 — 9,769 — — 2,749,012 Home equity loans 1,042,627 — 5,746 — — 1,048,373 Consumer finance loans 5,849 — 39 — — 5,888 Consumer loans 699,033 — 3,908 — — 702,941 Total Personal Banking 4,486,752 — 19,462 — — 4,506,214 Commercial Banking: Commercial real estate loans 2,083,302 47,983 146,144 — — 2,277,429 Commercial loans 487,143 21,120 24,501 — — 532,764 Total Commercial Banking 2,570,445 69,103 170,645 — — 2,810,193 Total originated loans 7,057,197 69,103 190,107 — — 7,316,407 Acquired loans: Personal Banking: Residential mortgage loans 96,563 — 1,259 — — 97,822 Home equity loans 222,610 — 1,362 — — 223,972 Consumer loans 66,673 — 547 — — 67,220 Total Personal Banking 385,846 — 3,168 — — 389,014 Commercial Banking: Commercial real estate loans 199,850 5,546 35,241 — — 240,637 Commercial loans 39,441 3,640 6,923 — — 50,004 Total Commercial Banking 239,291 9,186 42,164 — — 290,641 Total acquired loans 625,137 9,186 45,332 — — 679,655 Total loans $ 7,682,334 78,289 235,439 — — 7,996,062 The following table sets forth information about credit quality indicators, which were updated during the year ended December 31, 2017 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans: Personal Banking: Residential mortgage loans $ 2,645,475 — 16,905 — — 2,662,380 Home equity loans 1,042,965 — 8,593 — — 1,051,558 Consumer finance loans 18,420 — 199 — — 18,619 Consumer loans 549,550 — 3,816 — — 553,366 Total Personal Banking 4,256,410 — 29,513 — — 4,285,923 Commercial Banking: Commercial real estate loans 1,964,565 78,699 117,948 — — 2,161,212 Commercial loans 461,962 15,510 43,726 — — 521,198 Total Commercial Banking 2,426,527 94,209 161,674 — — 2,682,410 Total originated loans 6,682,937 94,209 191,187 — — 6,968,333 Acquired loans: Personal Banking: Residential mortgage loans 112,990 — 833 — — 113,823 Home equity loans 257,312 — 1,485 — — 258,797 Consumer loans 98,659 — 745 — — 99,404 Total Personal Banking 468,961 — 3,063 — — 472,024 Commercial Banking: Commercial real estate loans 251,761 4,838 36,915 — — 293,514 Commercial loans 49,073 3,787 6,678 — — 59,538 Total Commercial Banking 300,834 8,625 43,593 — — 353,052 Total acquired loans 769,795 8,625 46,656 — — 825,076 Total $ 7,452,732 102,834 237,843 — — 7,793,409

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of intangible assets subject to amortization	The following table provides information for intangible assets subject to amortization at the dates indicated (in thousands): September 30, December 31, Amortizable intangible assets: Core deposit intangibles — gross $ 63,685 63,685 Less: accumulated amortization (43,886 ) (40,029 ) Core deposit intangibles — net 19,799 23,656 Customer and Contract intangible assets — gross 10,474 10,474 Less: accumulated amortization (9,106 ) (8,461 ) Customer and Contract intangible assets — net $ 1,368 2,013
Schedule of the actual aggregate amortization expense as well as estimated aggregate amortization expense, based upon current levels of intangible assets	The following table shows the actual aggregate amortization expense for the quarters ended September 30, 2018 and 2017 , as well as the estimated aggregate amortization expense, based upon current levels of intangible assets, for the current fiscal year and each of the five succeeding fiscal years (in thousands): For the quarter ended September 30, 2018 $ 1,462 For the quarter ended September 30, 2017 1,691 For the nine months ended September 30, 2018 4,502 For the nine months ended September 30, 2017 5,189 For the year ending December 31, 2018 5,848 For the year ending December 31, 2019 4,933 For the year ending December 31, 2020 4,017 For the year ending December 31, 2021 3,188 For the year ending December 31, 2022 2,456 For the year ending December 31, 2023 1,847
Schedule of the changes in carrying amount of goodwill	The following table provides information for the changes in the carrying amount of goodwill (in thousands): Total Balance at December 31, 2016 $ 307,420 Goodwill from acquisition — Balance at December 31, 2017 307,420 Goodwill from acquisition — Balance at September 30, 2018 $ 307,420

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	The computation of basic and diluted earnings per share follows (in thousands, except share data and per share amounts): Quarter ended Nine months ended 2018 2017 2018 2017 Reported net income $ 27,740 23,591 79,024 72,319 Weighted average common shares outstanding 102,334,954 101,163,534 101,937,338 100,921,322 Dilutive potential shares due to effect of stock options 1,607,741 1,400,942 1,566,731 1,617,020 Total weighted average common shares and dilutive potential shares 103,942,695 102,564,476 103,504,069 102,538,342 Basic earnings per share: $ 0.27 0.23 0.78 0.72 Diluted earnings per share: $ 0.27 0.23 0.76 0.71

Pension and Other Post-retire_2

Pension and Other Post-retirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2018
Retirement Benefits [Abstract]
Schedule of net periodic costs for the defined benefit pension plans and the post retirement healthcare plans	The following table sets forth the net periodic costs for the defined benefit pension plans and post retirement healthcare plans for the periods indicated (in thousands): Quarter ended September 30, Pension benefits Other post-retirement benefits 2018 2017 2018 2017 Service cost $ 1,716 1,537 — — Interest cost 1,678 1,719 14 17 Expected return on plan assets (2,992 ) (2,628 ) — — Amortization of prior service cost (581 ) (580 ) — — Amortization of the net loss 872 928 24 27 Net periodic cost $ 693 976 38 44 Nine months ended September 30, Pension benefits Other post-retirement benefits 2018 2017 2018 2017 Service cost $ 5,148 4,612 — — Interest cost 5,034 5,159 41 51 Expected return on plan assets (8,976 ) (7,884 ) — — Amortization of prior service cost (1,742 ) (1,742 ) — — Amortization of the net loss 2,617 2,783 73 81 Net periodic cost $ 2,081 2,928 114 132

Disclosures About Fair Value _2

Disclosures About Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of the carrying amount and estimated fair value of the entity's financial instruments included in the consolidated statement of financial condition	The following table sets forth the carrying amount and estimated fair value of our financial instruments included in the consolidated statement of financial condition at September 30, 2018 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 73,946 73,946 73,946 — — Securities available-for-sale 811,556 811,556 — 811,556 — Securities held-to-maturity 24,222 23,534 — 23,534 — Loans receivable, net 7,940,087 7,721,559 — — 7,721,559 Accrued interest receivable 25,798 25,798 25,798 — — Interest rate swaps 4,386 4,386 — 4,386 — FHLB Stock 15,452 15,452 — — 15,452 Total financial assets $ 8,895,447 8,676,231 99,744 839,476 7,737,011 Financial liabilities: Savings and checking deposits $ 6,550,748 6,550,748 6,550,748 — — Time deposits 1,403,205 1,431,500 — — 1,431,500 Borrowed funds 179,117 179,111 179,111 — — Junior subordinated debentures 111,213 104,609 — — 104,609 Interest rate swaps 4,479 4,479 — 4,479 — Accrued interest payable 627 627 627 — — Total financial liabilities $ 8,249,389 8,271,074 6,730,486 4,479 1,536,109 The following table sets forth the carrying amount and estimated fair value of our financial instruments included in the consolidated statement of financial condition at December 31, 2017 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 77,710 77,710 77,710 — — Securities available-for-sale 792,535 792,535 574 791,961 — Securities held-to-maturity 29,678 29,667 — 29,667 — Loans receivable, net 7,736,614 7,762,562 3,128 — 7,759,434 Accrued Interest Receivable 23,352 23,352 23,352 — — Interest rate swaps 214 214 — 214 — FHLB Stock 11,733 11,733 — — 11,733 Total financial assets $ 8,671,836 8,697,773 104,764 821,842 7,771,167 Financial liabilities: Savings and checking accounts $ 6,414,366 6,414,366 6,414,366 — — Time deposits 1,412,623 1,433,380 — — 1,433,380 Borrowed funds 108,238 108,238 108,238 — — Junior subordinated debentures 111,213 110,954 — — 110,954 Interest rate swaps 1,278 1,278 — 1,278 — Foreign exchange swaps 61 61 — 61 — Accrued interest payable 460 460 460 — — Total financial liabilities $ 8,048,239 8,068,737 6,523,064 1,339 1,544,334
Schedule of assets and liabilities measured at fair value on a recurring basis	The following table represents assets and liabilities measured at fair value on a recurring basis at September 30, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Debt securities: U.S. government and agencies $ — 14,695 — 14,695 Government sponsored enterprises — 186,445 — 186,445 States and political subdivisions — 24,744 — 24,744 Corporate — 912 — 912 Total debt securities — 226,796 — 226,796 Residential mortgage-backed securities: GNMA — 27,820 — 27,820 FNMA — 71,251 — 71,251 FHLMC — 53,907 — 53,907 Non-agency — 535 — 535 Collateralized mortgage obligations: GNMA — 53,969 — 53,969 FNMA — 205,066 — 205,066 FHLMC — 172,212 — 172,212 Non-agency — — — — Total mortgage-backed securities — 584,760 — 584,760 Interest rate swaps — 4,386 — 4,386 Total Assets $ — 815,942 — 815,942 Interest rate swaps $ — 4,479 — 4,479 Total Liabilities $ — 4,479 — 4,479 The following table represents assets and liabilities measured at fair value on a recurring basis at December 31, 2017 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Equity securities $ 574 — — 574 Debt securities: U.S. government and agencies — 1 — 1 Government sponsored enterprises — 209,269 — 209,269 States and political subdivisions — 51,056 — 51,056 Corporate — 909 — 909 Total debt securities — 261,235 — 261,235 Residential mortgage-backed securities: GNMA — 29,695 — 29,695 FNMA — 82,969 — 82,969 FHLMC — 64,021 — 64,021 Non-agency — 555 — 555 Collateralized mortgage obligations: GNMA — 4,769 — 4,769 FNMA — 191,512 — 191,512 FHLMC — 157,190 — 157,190 Non-agency — 15 — 15 Total mortgage-backed securities — 530,726 — 530,726 Interest rate swaps — 214 — 214 Total Assets $ 574 792,175 — 792,749 Interest rate swaps $ — 1,278 — 1,278 Foreign exchange swaps — 61 — 61 Total Liabilities $ — 1,339 — 1,339
Schedule of reconciliation of debt securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)	The table below presents a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the periods indicated (in thousands): Quarter ended Nine months ended September 30, September 30, September 30, September 30, Beginning balance January 1, $ — 10,638 — 9,366 Total net realized investment gains/ (losses) and net change in unrealized appreciation/ (depreciation): Included in net income as OTTI — — — — Included in other comprehensive income — 21 — 1,293 Purchases — — — — Sales — — — — Transfers in to Level 3 — — — — Transfers out of Level 3 — — — — Ending balance September 30, $ — 10,659 — 10,659
Schedule of fair value measurement for nonrecurring assets	The following table represents the fair market measurement for only those nonrecurring assets that had a fair market value below the carrying amount as of September 30, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 37,932 37,932 Real estate owned — — 2,486 2,486 Total assets $ — — 40,418 40,418 The following table represents the fair market measurement for only those nonrecurring assets that had a fair market value below the carrying amount as of December 31, 2017 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 33,421 33,421 Real estate owned — — 5,666 5,666 Total assets $ — — 39,087 39,087
Schedule of quantitative information about assets measured at fair value on a recurring and nonrecurring basis for Level 3 fair value measurements	The table presents additional quantitative information about assets measured at fair value on a recurring and nonrecurring basis and for which we have utilized Level 3 inputs to determine fair value at September 30, 2018 (dollar amounts in thousands): Fair value Valuation techniques Significant unobservable inputs Range (weighted average) Loans measured for impairment 37,932 Appraisal value (1) Estimated cost to sell 10.0% Discounted cash flow Discount rate 4.25% to 10.0% (7.50%) Real estate owned 2,486 Appraisal value (1) Estimated cost to sell 10.0% (1) Fair value is generally determined through independent appraisals of the underlying collateral, which may include Level 3 inputs that are not identifiable, or by using the discounted cash flow method if the loan is not collateral dependent.

Derivative Financial Instrume_2

Derivative Financial Instruments - (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of derivative financial instruments	The following table presents information regarding our derivative financial instruments for the periods indicated: Asset Derivatives Liability Derivatives Notional Amount Fair Value Notional Amount Fair Value At September 30, 2018 Derivatives designed as hedging instruments: Interest rate swap agreements $ — — 25,000 93 Derivatives not designed as hedging instruments: Interest rate swap agreements 209,353 4,386 209,353 4,386 Total derivatives $ 209,353 4,386 234,353 4,479 At December 31, 2017 Derivatives designed as hedging instruments: Interest rate swap agreements $ — — 50,000 1,064 Derivatives not designed as hedging instruments: Interest rate swap agreements 92,631 214 92,631 214 Foreign exchange swap agreements — — 12,344 61 Total derivatives $ 92,631 214 154,975 1,339
Derivative instruments gain (loss)	The following table presents income or expense recognized on derivatives for the periods indicated: For the quarter ended For the nine months ended September 30, 2018 2017 2018 2017 Hedging interest rate derivatives: Increase in interest expense 257 393 857 1,216 Non-hedging swap derivatives: Increase/ (decrease) in other income — 99 (288 ) 333

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income/ (Loss) (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Schedule of changes in accumulated other comprehensive income by component	The following table shows the changes in accumulated other comprehensive income by component for the periods indicated (in thousands): For the quarter ended September 30, 2018 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of June 30, 2018 $ (10,693 ) (266 ) (32,134 ) (43,093 ) Other comprehensive income/ (loss) before reclassification adjustments (1,970 ) 192 — (1,778 ) Amounts reclassified from accumulated other comprehensive income (1), (2) (44 ) — 226 182 Net other comprehensive income/ (loss) (2,014 ) 192 226 (1,596 ) Balance as of September 30, 2018 $ (12,707 ) (74 ) (31,908 ) (44,689 ) For the quarter ended September 30, 2017 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of June 30, 2017 $ 2,276 (1,257 ) (26,167 ) (25,148 ) Other comprehensive income before reclassification adjustments (264 ) 258 — (6 ) Amounts reclassified from accumulated other comprehensive income (3), (4) (674 ) — 221 (453 ) Net other comprehensive income (938 ) 258 221 (459 ) Balance as of September 30, 2017 $ 1,338 (999 ) (25,946 ) (25,607 ) (1) Consists of realized gain on securities (gain on sales of investments, net) of $61 , net of tax (income tax expense) of $(17) . (2) Consists of amortization of prior service cost (compensation and employee benefits) of $581 and amortization of net loss (compensation and employee benefits) of $(897) , net of tax (income tax expense) of $90 . (3) Consists of realized gain on securities (gain on sales of investments, net) of $1,043 , net of tax (income tax expense) of $(369) . (4) Consists of amortization of prior service cost (compensation and employee benefits) of $580 and amortization of net loss (compensation and employee benefits) of $(954) , net of tax (income tax expense) of $153 . For the nine months ended September 30, 2018 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of December 31, 2017 $ (4,409 ) (691 ) (26,980 ) (32,080 ) Reclassification due to adoption of ASU No. 2018-02 (991 ) (149 ) (5,606 ) (6,746 ) Other comprehensive income/ (loss) before reclassification adjustments (7,169 ) 766 — (6,403 ) Amounts reclassified from accumulated other comprehensive income (1), (2) (138 ) — 678 540 Net other comprehensive income/ (loss) (7,307 ) 766 678 (5,863 ) Balance as of September 30, 2018 $ (12,707 ) (74 ) (31,908 ) (44,689 ) For the nine months ended September 30, 2017 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of December 31, 2016 $ 395 (1,778 ) (26,608 ) (27,991 ) Other comprehensive income before reclassification adjustments 1,684 779 — 2,463 Amounts reclassified from accumulated other comprehensive income (3), (4) (741 ) — 662 (79 ) Net other comprehensive income 943 779 662 2,384 Balance as of September 30, 2017 $ 1,338 (999 ) (25,946 ) (25,607 ) (1) Consists of realized gains on securities (loss on sales of investments, net) of $192 , net of tax (income tax expense) of $54 . (2) Consists of amortization of prior service cost (compensation and employee benefits) of $1,742 and amortization of net loss (compensation and employee benefits) of $(2,691) , net of tax (income tax expense) of $271 . (3) Consists of realized gains on securities (gain on sales of investments, net) of $1,157 , net of tax (income tax expense) of $(416) . (4) Consists of amortization of prior service cost (compensation and employee benefits) of $1,742 and amortization of net loss (compensation and employee benefits) of $(2,864) , net of tax (income tax expense) of $460 .

Basis of Presentation and Inf_3

Basis of Presentation and Informational Disclosures (Details)	May 14, 2018$ / sharesshares	Sep. 30, 2018USD ($)bank	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)bank	Sep. 30, 2017USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of banking locations | bank		172		172
Stock Related Compensation
Stock-based compensation expense		$ 1,300,000	$ 1,100,000	$ 4,500,000	$ 3,700,000
Unrecognized tax benefits liability		0		0
Reclassification due to adoption of ASU No. 2018-02		6,700,000
Employee Stock Ownership Plan
Stock Related Compensation
Compensation expense yet to be recognized		4,300,000		4,300,000
Restricted common shares
Stock Related Compensation
Compensation expense yet to be recognized		18,600,000		18,600,000
Accounting Standards Update 2017-07
Stock Related Compensation
Reversal of net periodic benefit expense		$ 517,000		$ 1,600,000
Employee | Employee Stock Ownership Plan
Stock Related Compensation
Options, grants in period (in shares) | shares	831,160
Options, grants in period (in dollars per share) | $ / shares	$ 16.59
Options, grants in period weighted average grant date value (in dollars per share) | $ / shares	$ 1.49
Employee | Restricted common shares
Stock Related Compensation
Equity instruments other than options grants in period (in shares) | shares	390,030
Director | Employee Stock Ownership Plan
Stock Related Compensation
Options, grants in period (in shares) | shares	64,800
Award vesting period	7 years
Director | Restricted common shares
Stock Related Compensation
Equity instruments other than options grants in period (in shares) | shares	24,300
Equity instruments other than options, grants in period grant date fair value (in dollars per share) | $ / shares	$ 16.59

Investment securities and imp_3

Investment securities and impairment of investment securities - Available For Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized cost
Residential mortgage-backed securities	$ 829,345	$ 800,094
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	2,173	3,453
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(19,962)	(11,012)
Fair value
Securities available-for-sale	811,556	792,535
U.S. government and agencies
Amortized cost
Due after one year through five years	14,707
Due in one year or less		1
Gross unrealized holding gains
Due after one year through five years	0
Due in one year or less		0
Gross unrealized holding losses
Due after one year through five years	(12)
Due in one year or less		0
Fair value
Due after one year through five years	14,695
Due in one year or less		1
Debt issued by government sponsored enterprises:
Amortized cost
Due after one year through five years	116,097	140,624
Due in one year or less	70,096	66,566
Due after ten years	3,822	4,833
Gross unrealized holding gains
Due after one year through five years	0	0
Due in one year or less	0	14
Due after ten years	0	0
Gross unrealized holding losses
Due after one year through five years	(2,560)	(2,402)
Due in one year or less	(895)	(289)
Due after ten years	(115)	(77)
Fair value
Due after one year through five years	113,537	138,222
Due in one year or less	69,201	66,291
Due after ten years	3,707	4,756
Equity securities
Amortized cost
Equity securities amortized cost		551
Gross unrealized holding gains
Equity securities, gross unrealized holding gains		29
Gross unrealized holding losses
Equity securities, gross unrealized holding losses		(6)
Fair value
Equity securities		574
Municipal securities
Amortized cost
Due after one year through five years	3,553	7,072
Due in one year or less	2,351	2,492
Due after five years through ten years	11,714	14,576
Due after ten years	7,073	26,371
Gross unrealized holding gains
Due after one year through five years	43	82
Due in one year or less	3	7
Due after five years through ten years	46	171
Due after ten years	31	292
Gross unrealized holding losses
Due after one year through five years	(11)	(6)
Due in one year or less	(7)	(1)
Due after five years through ten years	(23)	0
Due after ten years	(29)	0
Fair value
Due after one year through five years	3,585	7,148
Due in one year or less	2,347	2,498
Due after five years through ten years	11,737	14,747
Due after ten years	7,075	26,663
Corporate debt securities
Amortized cost
Due after five years through ten years	912
Due after ten years		909
Gross unrealized holding gains
Due after five years through ten years	0
Due after ten years		0
Gross unrealized holding losses
Due after five years through ten years	0
Due after ten years		0
Fair value
Due after five years through ten years	912
Due after ten years		909
Residential mortgage-backed securities
Amortized cost
Residential mortgage-backed securities	599,020	536,099
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	2,050	2,858
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(16,310)	(8,231)
Fair value
Securities available-for-sale	584,760	530,726
Fixed rate | Pass-through
Amortized cost
Residential mortgage-backed securities	131,255	144,411
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	514	1,108
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(5,689)	(2,817)
Fair value
Securities available-for-sale	126,080	142,702
Fixed rate | Non-agency CMOs
Amortized cost
Residential mortgage-backed securities	0	15
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	0	0
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	0	0
Fair value
Securities available-for-sale	0	15
Fixed rate | Agency CMOs
Amortized cost
Residential mortgage-backed securities	374,900	284,320
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	5	37
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(10,595)	(5,271)
Fair value
Securities available-for-sale	364,310	279,086
Variable rate | Pass-through
Amortized cost
Residential mortgage-backed securities	26,374	33,079
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	1,064	1,464
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(5)	(6)
Fair value
Securities available-for-sale	27,433	34,537
Variable rate | Agency CMOs
Amortized cost
Residential mortgage-backed securities	66,491	74,274
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	467	249
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(21)	(137)
Fair value
Securities available-for-sale	$ 66,937	$ 74,386

Investment securities and imp_4

Investment securities and impairment of investment securities - Held To Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized cost
Marketable securities held-to-maturity, amortized cost	$ 24,222	$ 29,678
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	94	237
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	(782)	(248)
Fair value
Marketable securities held-to-maturity, fair value	23,534	29,667
Residential mortgage-backed securities
Amortized cost
Marketable securities held-to-maturity, amortized cost	24,222	29,678
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	94	237
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	(782)	(248)
Fair value
Marketable securities held-to-maturity, fair value	23,534	29,667
Fixed rate | Pass-through
Amortized cost
Marketable securities held-to-maturity, amortized cost	3,027	3,760
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	44	140
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	0	0
Fair value
Marketable securities held-to-maturity, fair value	3,071	3,900
Fixed rate | Agency CMOs
Amortized cost
Marketable securities held-to-maturity, amortized cost	18,753	22,906
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	0	20
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	(782)	(248)
Fair value
Marketable securities held-to-maturity, fair value	17,971	22,678
Variable rate | Pass-through
Amortized cost
Marketable securities held-to-maturity, amortized cost	1,778	2,283
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	39	64
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	0	0
Fair value
Marketable securities held-to-maturity, fair value	1,817	2,347
Variable rate | Agency CMOs
Amortized cost
Marketable securities held-to-maturity, amortized cost	664	729
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	11	13
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	0	0
Fair value
Marketable securities held-to-maturity, fair value	$ 675	$ 742

Investment securities and imp_5

Investment securities and impairment of investment securities - Fair Value of and Gross Unrealized Losses on Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Marketable securities
Less than 12 months - Fair value	$ 255,686	$ 249,272
Less than 12 months - Unrealized loss	(2,387)	(2,536)
12 months or more - Fair value	460,082	400,583
12 months or more - Unrealized loss	(18,357)	(8,724)
Total - Fair value	715,768	649,855
Total - Unrealized loss	(20,744)	(11,260)
U.S. government and agencies
Marketable securities
Less than 12 months - Fair value	55,650	5,006
Less than 12 months - Unrealized loss	(210)	(7)
12 months or more - Fair value	130,795	197,695
12 months or more - Unrealized loss	(3,360)	(2,761)
Total - Fair value	186,445	202,701
Total - Unrealized loss	(3,570)	(2,768)
Municipal securities
Marketable securities
Less than 12 months - Fair value	9,025	4,563
Less than 12 months - Unrealized loss	(70)	(7)
12 months or more - Fair value	0	0
12 months or more - Unrealized loss	0	0
Total - Fair value	9,025	4,563
Total - Unrealized loss	(70)	(7)
Equity securities
Marketable securities
Less than 12 months - Fair value		0
Less than 12 months - Unrealized loss		0
12 months or more - Fair value		544
12 months or more - Unrealized loss		(6)
Total - Fair value		544
Total - Unrealized loss		(6)
Residential mortgage-backed securities | Agency CMOs
Marketable securities
Less than 12 months - Fair value	176,316	239,703
Less than 12 months - Unrealized loss	(2,095)	(2,522)
12 months or more - Fair value	329,287	202,344
12 months or more - Unrealized loss	(14,997)	(5,957)
Total - Fair value	505,603	442,047
Total - Unrealized loss	(17,092)	$ (8,479)
U.S. government and agencies
Marketable securities
Less than 12 months - Fair value	14,695
Less than 12 months - Unrealized loss	(12)
12 months or more - Fair value	0
12 months or more - Unrealized loss	0
Total - Fair value	14,695
Total - Unrealized loss	$ (12)

Investment securities and imp_6

Investment securities and impairment of investment securities - Cumulative roll forward of credit losses recognized in earnings for debt securities held and not intended to be sold (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Cumulative roll forward of credit related impairment losses recognized in earnings for debt securities held and not intended to be sold:
Beginning balance	$ 0	$ 7,942	$ 352	$ 7,942
Credit losses on debt securities for which other-than-temporary impairment was not previously recognized	0	0	0	0
Reduction for losses realized during the quarter			(352)	0
Reduction for securities sold/ called realized during the nine months	0	0	0	0
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized	0	0	0	0
Ending balance	$ 0	$ 7,942	$ 0	$ 7,942

Loans receivable - Summary of O

Loans receivable - Summary of Originated and Acquired Loans (Details) - USD ($)	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	$ 8,237,772,000		$ 7,972,735,000
Deferred loan costs	33,782,000		27,782,000
Allowance for loan losses	(55,975,000)	$ (57,332,000)	(56,795,000)	$ (56,927,000)	$ (62,885,000)	$ (60,939,000)
Total loans receivable, net	7,940,087,000		7,736,614,000
Residential mortgage loans held-for-sale	0		3,128,000
Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(11,335,000)		(10,067,000)
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(200,822,000)		(144,614,000)
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(63,335,000)		(52,427,000)
Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	4,872,781,000		4,740,232,000
Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,843,012,000		2,772,549,000
Residential mortgage loans held-for-sale	0		3,100,000
Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	1,272,345,000		1,310,355,000
Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	5,888,000		18,619,000
Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	751,536,000		638,709,000
Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	3,364,991,000		3,232,503,000
Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,718,888,000		2,599,340,000
Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	646,103,000		633,163,000
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	7,557,223,000		7,145,255,000
Deferred loan costs	32,846,000		26,255,000
Allowance for loan losses	(51,473,000)	(51,138,000)	(50,572,000)	(50,845,000)	(56,627,000)	(55,293,000)
Total loans receivable, net	7,264,934,000		6,917,761,000
Originated | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(11,335,000)		(10,067,000)
Originated | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(200,152,000)		(141,967,000)
Originated | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(62,175,000)		(51,143,000)
Originated | Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	4,484,703,000		4,269,735,000
Allowance for loan losses	(20,049,000)	(19,610,000)	(20,339,000)	(19,540,000)	(17,339,000)	(16,116,000)
Originated | Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,745,190,000		2,658,726,000
Allowance for loan losses	(4,144,000)	(3,657,000)	(3,824,000)	(3,986,000)	(4,635,000)	(4,656,000)
Originated | Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	1,048,373,000		1,051,558,000
Allowance for loan losses	(3,234,000)	(3,839,000)	(4,072,000)	(3,295,000)	(2,957,000)	(3,486,000)
Originated | Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	5,888,000		18,619,000
Allowance for loan losses	(1,650,000)	(2,354,000)	(3,968,000)	(4,876,000)	(4,467,000)	(3,445,000)
Originated | Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	685,252,000		540,832,000
Allowance for loan losses	(11,021,000)	(9,760,000)	(8,475,000)	(7,383,000)	(5,280,000)	(4,529,000)
Originated | Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	3,072,520,000		2,875,520,000
Allowance for loan losses	(31,424,000)	(31,528,000)	(30,233,000)	(31,305,000)	(39,288,000)	(39,177,000)
Originated | Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,477,581,000		2,303,179,000
Allowance for loan losses	(25,694,000)	(21,019,000)	(19,911,000)	(20,174,000)	(22,584,000)	(23,667,000)
Originated | Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	594,939,000		572,341,000
Allowance for loan losses	(5,730,000)	(10,509,000)	(10,322,000)	(11,131,000)	(16,704,000)	(15,510,000)
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	680,549,000		827,480,000
Deferred loan costs	936,000		1,527,000
Allowance for loan losses	(4,502,000)	(6,194,000)	(6,223,000)	(6,082,000)	(6,258,000)	(5,646,000)
Total loans receivable, net	675,153,000		818,853,000
Acquired | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	0		0
Acquired | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(670,000)		(2,647,000)
Acquired | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(1,160,000)		(1,284,000)
Acquired | Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	388,078,000		470,497,000
Allowance for loan losses	(954,000)	(1,747,000)	(1,783,000)	(1,419,000)	(1,336,000)	(1,771,000)
Acquired | Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	97,822,000		113,823,000
Allowance for loan losses	(102,000)	(170,000)	(131,000)	(77,000)	(85,000)	(71,000)
Acquired | Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	223,972,000		258,797,000
Allowance for loan losses	(408,000)	(662,000)	(762,000)	(748,000)	(623,000)	(1,047,000)
Acquired | Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	0		0
Acquired | Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	66,284,000		97,877,000
Allowance for loan losses	(444,000)	(915,000)	(890,000)	(594,000)	(628,000)	(653,000)
Acquired | Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	292,471,000		356,983,000
Allowance for loan losses	(3,548,000)	(4,447,000)	(4,440,000)	(4,663,000)		(3,875,000)
Acquired | Commercial Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses				(3,301,000)	(2,446,000)
Acquired | Commercial Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses				(1,362,000)	(2,476,000)
Acquired | Commercial Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses				(4,663,000)	$ (4,922,000)
Acquired | Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	241,307,000		296,161,000
Allowance for loan losses	(2,876,000)	(3,422,000)	(3,549,000)	(3,301,000)		(3,008,000)
Acquired | Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	51,164,000		60,822,000
Allowance for loan losses	$ (672,000)	$ (1,025,000)	$ (891,000)	$ (1,362,000)		$ (867,000)

Loans receivable - Outstanding

Loans receivable - Outstanding Principal Balance and Related Carrying Value of Acquired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	$ 686,986	$ 833,940
Carrying value	679,655	825,076
Acquired loans evaluated individually for future credit losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	8,446	9,735
Carrying value	5,871	6,875
Acquired loans evaluated collectively for future credit losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	678,540	824,205
Carrying value	$ 673,784	$ 818,201

Loans receivable - Changes in t

Loans receivable - Changes in the Accretable Discount (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Changes in accretable yield
Beginning balance	$ 1,540	$ 2,187
Accretion	(588)	(1,318)
Net reclassification from nonaccretable yield	0	671
Ending balance	$ 952	$ 1,540

Loans receivable - Composition

Loans receivable - Composition of Acquired Impaired Loans by Portfolio Segment and by Class of Financing Receivable (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	$ 113,118	$ 84,625
Average recorded investment in impaired loans	82,504	97,193
Interest income recognized	2,791	3,982
Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	34,682	36,833
Average recorded investment in impaired loans	33,609	35,102
Interest income recognized	1,204	1,552
Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	21,439	21,605
Average recorded investment in impaired loans	20,499	21,531
Interest income recognized	659	892
Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	8,897	10,356
Average recorded investment in impaired loans	9,250	9,150
Interest income recognized	375	452
Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	4,307	4,673
Average recorded investment in impaired loans	3,835	4,042
Interest income recognized	166	188
Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	78,436	47,792
Average recorded investment in impaired loans	48,895	62,091
Interest income recognized	1,587	2,430
Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	70,720	37,027
Average recorded investment in impaired loans	39,985	49,981
Interest income recognized	1,195	1,758
Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	7,716	10,765
Average recorded investment in impaired loans	8,910	12,110
Interest income recognized	392	672
Acquired loans evaluated individually for future credit losses
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	5,871	6,875
Outstanding principal balance	8,446	9,735
Related impairment reserve	25	88
Average recorded investment in impaired loans	6,373	9,770
Interest income recognized	588	1,318
Acquired loans evaluated individually for future credit losses | Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	2,150	2,384
Outstanding principal balance	3,813	4,259
Related impairment reserve	24	49
Average recorded investment in impaired loans	2,267	2,601
Interest income recognized	293	389
Acquired loans evaluated individually for future credit losses | Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	1,099	1,182
Outstanding principal balance	1,741	1,880
Related impairment reserve	13	24
Average recorded investment in impaired loans	1,140	1,251
Interest income recognized	135	181
Acquired loans evaluated individually for future credit losses | Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	1,019	1,143
Outstanding principal balance	1,977	2,219
Related impairment reserve	7	21
Average recorded investment in impaired loans	1,081	1,253
Interest income recognized	127	157
Acquired loans evaluated individually for future credit losses | Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	32	59
Outstanding principal balance	95	160
Related impairment reserve	4	4
Average recorded investment in impaired loans	46	97
Interest income recognized	31	51
Acquired loans evaluated individually for future credit losses | Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	3,721	4,491
Outstanding principal balance	4,633	5,476
Related impairment reserve	1	39
Average recorded investment in impaired loans	4,106	7,169
Interest income recognized	295	929
Acquired loans evaluated individually for future credit losses | Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	3,643	4,388
Outstanding principal balance	4,548	5,363
Related impairment reserve	1	39
Average recorded investment in impaired loans	4,015	6,992
Interest income recognized	287	914
Acquired loans evaluated individually for future credit losses | Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	78	103
Outstanding principal balance	85	113
Related impairment reserve	0	0
Average recorded investment in impaired loans	91	177
Interest income recognized	$ 8	$ 15

Loans receivable - Changes in_2

Loans receivable - Changes in the Allowance for Losses on Loans Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	$ 57,332	$ 62,885	$ 56,795	$ 60,939
Current period provision	6,982	3,027	16,540	13,226
Charge-offs	(10,399)	(10,046)	(22,483)	(22,222)
Recoveries	2,060	1,061	5,123	4,984
Balance at the end of the period	55,975	56,927	55,975	56,927
Originated
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	51,138	56,627	50,572	55,293
Current period provision	8,504	993	17,395	9,071
Charge-offs	(10,098)	(7,598)	(21,007)	(17,218)
Recoveries	1,929	823	4,513	3,699
Balance at the end of the period	51,473	50,845	51,473	50,845
Originated | Personal Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	19,610	17,339	20,339	16,116
Current period provision	3,726	8,967	9,890	16,576
Charge-offs	(4,364)	(7,231)	(13,252)	(14,862)
Recoveries	1,077	465	3,072	1,710
Balance at the end of the period	20,049	19,540	20,049	19,540
Originated | Personal Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	3,657	4,635	3,824	4,656
Current period provision	491	(462)	678	(278)
Charge-offs	(204)	(211)	(710)	(678)
Recoveries	200	24	352	286
Balance at the end of the period	4,144	3,986	4,144	3,986
Originated | Personal Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	3,839	2,957	4,072	3,486
Current period provision	(351)	615	(164)	503
Charge-offs	(323)	(285)	(866)	(803)
Recoveries	69	8	192	109
Balance at the end of the period	3,234	3,295	3,234	3,295
Originated | Personal Banking | Consumer finance loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	2,354	4,467	3,968	3,445
Current period provision	(437)	4,220	(469)	6,610
Charge-offs	(445)	(3,891)	(2,484)	(5,469)
Recoveries	178	80	635	290
Balance at the end of the period	1,650	4,876	1,650	4,876
Originated | Personal Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	9,760	5,280	8,475	4,529
Current period provision	4,023	4,594	9,845	9,741
Charge-offs	(3,392)	(2,844)	(9,192)	(7,912)
Recoveries	630	353	1,893	1,025
Balance at the end of the period	11,021	7,383	11,021	7,383
Originated | Commercial Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	31,528	39,288	30,233	39,177
Current period provision	4,778	(7,974)	7,505	(7,505)
Charge-offs	(5,734)	(367)	(7,755)	(2,356)
Recoveries	852	358	1,441	1,989
Balance at the end of the period	31,424	31,305	31,424	31,305
Originated | Commercial Banking | Commercial real estate loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	21,019	22,584	19,911	23,667
Current period provision	8,723	(2,529)	10,417	(3,988)
Charge-offs	(4,820)	(163)	(5,702)	(498)
Recoveries	772	282	1,068	993
Balance at the end of the period	25,694	20,174	25,694	20,174
Originated | Commercial Banking | Commercial loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	10,509	16,704	10,322	15,510
Current period provision	(3,945)	(5,445)	(2,912)	(3,517)
Charge-offs	(914)	(204)	(2,053)	(1,858)
Recoveries	80	76	373	996
Balance at the end of the period	5,730	11,131	5,730	11,131
Acquired
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	6,194	6,258	6,223	5,646
Current period provision	(1,522)	2,034	(855)	4,155
Charge-offs	(301)	(2,448)	(1,476)	(5,004)
Recoveries	131	238	610	1,285
Balance at the end of the period	4,502	6,082	4,502	6,082
Acquired | Personal Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	1,747	1,336	1,783	1,771
Current period provision	(691)	419	(316)	1,047
Charge-offs	(191)	(405)	(881)	(1,951)
Recoveries	89	69	368	552
Balance at the end of the period	954	1,419	954	1,419
Acquired | Personal Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	170	85	131	71
Current period provision	(70)	(11)	(38)	130
Charge-offs	(10)	(4)	(94)	(199)
Recoveries	12	7	103	75
Balance at the end of the period	102	77	102	77
Acquired | Personal Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	662	623	762	1,047
Current period provision	(173)	324	85	512
Charge-offs	(103)	(243)	(578)	(1,063)
Recoveries	22	44	139	252
Balance at the end of the period	408	748	408	748
Acquired | Personal Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	915	628	890	653
Current period provision	(448)	106	(363)	405
Charge-offs	(78)	(158)	(209)	(689)
Recoveries	55	18	126	225
Balance at the end of the period	444	594	444	594
Acquired | Commercial Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	4,447		4,440	3,875
Current period provision	(831)		(539)	3,108
Charge-offs	(110)		(595)	(3,053)
Recoveries	42		242	733
Balance at the end of the period	3,548	4,663	3,548	4,663
Acquired | Commercial Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period		2,446
Current period provision		2,433
Charge-offs		(1,738)
Recoveries		160
Balance at the end of the period		3,301		3,301
Acquired | Commercial Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period		2,476
Current period provision		(818)
Charge-offs		(305)
Recoveries		9
Balance at the end of the period		1,362		1,362
Acquired | Commercial Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period		4,922
Current period provision		1,615
Charge-offs		(2,043)
Recoveries		169
Balance at the end of the period		4,663		4,663
Acquired | Commercial Banking | Commercial real estate loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	3,422		3,549	3,008
Current period provision	(532)		(688)	1,832
Charge-offs	(39)		(147)	(2,206)
Recoveries	25		162	667
Balance at the end of the period	2,876	3,301	2,876	3,301
Acquired | Commercial Banking | Commercial loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	1,025		891	867
Current period provision	(299)		149	1,276
Charge-offs	(71)		(448)	(847)
Recoveries	17		80	66
Balance at the end of the period	$ 672	$ 1,362	$ 672	$ 1,362

Loans receivable - Loan Portfol

Loans receivable - Loan Portfolio by Portfolio Segment and by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 7,996,062		$ 7,793,409
Allowance for loan losses	55,975		56,795
Nonaccrual loans	74,227		64,455
Loans past due 90 days or more and still accruing	195		502
TDRs	29,147	$ 30,662	32,104	$ 38,469	$ 41,860	$ 42,926
Allowance related to TDRs	3,067		3,144
Additional commitments to customers with loans classified as TDRs	421		247
Nonaccrual TDRs	9,777		12,300	$ 17,809
Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	4,895,228		4,757,947
Allowance for loan losses	21,003		22,122
Nonaccrual loans	26,016		28,570
Loans past due 90 days or more and still accruing	195		502
TDRs	9,729		9,716
Allowance related to TDRs	1,275		1,277
Additional commitments to customers with loans classified as TDRs	4		4
Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	2,846,834		2,776,203
Allowance for loan losses	4,246		3,955
Nonaccrual loans	14,585		14,791
Loans past due 90 days or more and still accruing	0		0
TDRs	7,668		8,000
Allowance related to TDRs	778		815
Additional commitments to customers with loans classified as TDRs	0		0
Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,272,345		1,310,355
Allowance for loan losses	3,642		4,834
Nonaccrual loans	7,085		8,907
Loans past due 90 days or more and still accruing	72		120
TDRs	2,061		1,716
Allowance related to TDRs	497		462
Additional commitments to customers with loans classified as TDRs	4		4
Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	5,888		18,619
Allowance for loan losses	1,650		3,968
Nonaccrual loans	39		199
Loans past due 90 days or more and still accruing	0		3
TDRs	0		0
Allowance related to TDRs	0		0
Additional commitments to customers with loans classified as TDRs	0		0
Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	770,161		652,770
Allowance for loan losses	11,465		9,365
Nonaccrual loans	4,307		4,673
Loans past due 90 days or more and still accruing	123		379
TDRs	0		0
Allowance related to TDRs	0		0
Additional commitments to customers with loans classified as TDRs	0		0
Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	3,100,834		3,035,462
Allowance for loan losses	34,972		34,673
Nonaccrual loans	48,211		35,885
Loans past due 90 days or more and still accruing	0		0
TDRs	19,418		22,388
Allowance related to TDRs	1,792		1,867
Additional commitments to customers with loans classified as TDRs	417		243
Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	2,518,066		2,454,726
Allowance for loan losses	28,570		23,460
Nonaccrual loans	43,023		28,473
Loans past due 90 days or more and still accruing	0		0
TDRs	15,667		15,691
Allowance related to TDRs	1,516		1,125
Additional commitments to customers with loans classified as TDRs	208		235
Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	582,768		580,736
Allowance for loan losses	6,402		11,213
Nonaccrual loans	5,188		7,412
Loans past due 90 days or more and still accruing	0		0
TDRs	3,751		6,697
Allowance related to TDRs	276		742
Additional commitments to customers with loans classified as TDRs	$ 209		$ 8

Loans receivable - Compositio_2

Loans receivable - Composition of Impaired Loans by Portfolio Segment and Class of Financing Receivable (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	$ 74,227	$ 64,455
Total impaired loans	113,118	84,625
Average recorded investment in impaired loans	82,504	97,193
Interest income recognized on impaired loans	2,791	3,982
Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	26,016	28,570
Total impaired loans	34,682	36,833
Average recorded investment in impaired loans	33,609	35,102
Interest income recognized on impaired loans	1,204	1,552
Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	14,585	14,791
Total impaired loans	21,439	21,605
Average recorded investment in impaired loans	20,499	21,531
Interest income recognized on impaired loans	659	892
Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	7,085	8,907
Total impaired loans	8,897	10,356
Average recorded investment in impaired loans	9,250	9,150
Interest income recognized on impaired loans	375	452
Personal Banking | Consumer finance loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	39	199
Total impaired loans	39	199
Average recorded investment in impaired loans	25	379
Interest income recognized on impaired loans	4	20
Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	4,307	4,673
Total impaired loans	4,307	4,673
Average recorded investment in impaired loans	3,835	4,042
Interest income recognized on impaired loans	166	188
Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	48,211	35,885
Total impaired loans	78,436	47,792
Average recorded investment in impaired loans	48,895	62,091
Interest income recognized on impaired loans	1,587	2,430
Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	43,023	28,473
Total impaired loans	70,720	37,027
Average recorded investment in impaired loans	39,985	49,981
Interest income recognized on impaired loans	1,195	1,758
Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	5,188	7,412
Total impaired loans	7,716	10,765
Average recorded investment in impaired loans	8,910	12,110
Interest income recognized on impaired loans	392	672
90 Days or greater delinquent
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	52,402	43,077
90 Days or greater delinquent | Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	22,566	24,576
90 Days or greater delinquent | Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	13,154	13,509
90 Days or greater delinquent | Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	5,838	7,251
90 Days or greater delinquent | Personal Banking | Consumer finance loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	39	199
90 Days or greater delinquent | Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	3,535	3,617
90 Days or greater delinquent | Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	29,836	18,501
90 Days or greater delinquent | Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	27,122	15,361
90 Days or greater delinquent | Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	2,714	3,140
Less than 90 days delinquent
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	21,825	21,378
Loans less than 90 days delinquent reviewed for impairment	23,311	5,337
TDRs less than 90 days delinquent not included elsewhere	15,580	14,833
Less than 90 days delinquent | Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	3,450	3,994
Loans less than 90 days delinquent reviewed for impairment	505	0
TDRs less than 90 days delinquent not included elsewhere	8,161	8,263
Less than 90 days delinquent | Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	1,431	1,282
Loans less than 90 days delinquent reviewed for impairment	505	0
TDRs less than 90 days delinquent not included elsewhere	6,349	6,814
Less than 90 days delinquent | Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	1,247	1,656
Loans less than 90 days delinquent reviewed for impairment	0	0
TDRs less than 90 days delinquent not included elsewhere	1,812	1,449
Less than 90 days delinquent | Personal Banking | Consumer finance loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	0	0
Loans less than 90 days delinquent reviewed for impairment	0	0
TDRs less than 90 days delinquent not included elsewhere	0	0
Less than 90 days delinquent | Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	772	1,056
Loans less than 90 days delinquent reviewed for impairment	0	0
TDRs less than 90 days delinquent not included elsewhere	0	0
Less than 90 days delinquent | Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	18,375	17,384
Loans less than 90 days delinquent reviewed for impairment	22,806	5,337
TDRs less than 90 days delinquent not included elsewhere	7,419	6,570
Less than 90 days delinquent | Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	15,901	13,112
Loans less than 90 days delinquent reviewed for impairment	22,583	4,431
TDRs less than 90 days delinquent not included elsewhere	5,114	4,123
Less than 90 days delinquent | Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	2,474	4,272
Loans less than 90 days delinquent reviewed for impairment	223	906
TDRs less than 90 days delinquent not included elsewhere	$ 2,305	$ 2,447

Loans receivable - Evaluation o

Loans receivable - Evaluation of Impaired Loans by Portfolio Segment and by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	$ 7,924,583	$ 7,752,745
Loans individually evaluated for impairment	71,479	40,664
Loans individually evaluated for impairment for which there is a related impairment reserve	42,583	37,411
Related impairment reserve	4,651	3,990
Loans individually evaluated for impairment for which there is no related reserve	28,896	3,253
Personal Banking
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	4,884,897	4,747,578
Loans individually evaluated for impairment	10,331	10,369
Loans individually evaluated for impairment for which there is a related impairment reserve	10,331	10,369
Related impairment reserve	1,299	1,302
Loans individually evaluated for impairment for which there is no related reserve	0	0
Personal Banking | Residential mortgage loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	2,838,600	2,767,635
Loans individually evaluated for impairment	8,234	8,568
Loans individually evaluated for impairment for which there is a related impairment reserve	8,234	8,568
Related impairment reserve	795	816
Loans individually evaluated for impairment for which there is no related reserve	0	0
Personal Banking | Home equity loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	1,270,284	1,308,639
Loans individually evaluated for impairment	2,061	1,716
Loans individually evaluated for impairment for which there is a related impairment reserve	2,061	1,716
Related impairment reserve	497	461
Loans individually evaluated for impairment for which there is no related reserve	0	0
Personal Banking | Consumer finance loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	5,888	18,619
Loans individually evaluated for impairment	0	0
Loans individually evaluated for impairment for which there is a related impairment reserve	0	0
Related impairment reserve	0	0
Loans individually evaluated for impairment for which there is no related reserve	0	0
Personal Banking | Consumer loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	770,125	652,685
Loans individually evaluated for impairment	36	85
Loans individually evaluated for impairment for which there is a related impairment reserve	36	85
Related impairment reserve	7	25
Loans individually evaluated for impairment for which there is no related reserve	0	0
Commercial Banking
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	3,039,686	3,005,167
Loans individually evaluated for impairment	61,148	30,295
Loans individually evaluated for impairment for which there is a related impairment reserve	32,252	27,042
Related impairment reserve	3,352	2,688
Loans individually evaluated for impairment for which there is no related reserve	28,896	3,253
Commercial Banking | Commercial real estate loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	2,462,663	2,433,755
Loans individually evaluated for impairment	55,403	20,971
Loans individually evaluated for impairment for which there is a related impairment reserve	27,924	18,470
Related impairment reserve	2,877	1,859
Loans individually evaluated for impairment for which there is no related reserve	27,479	2,501
Commercial Banking | Commercial loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	577,023	571,412
Loans individually evaluated for impairment	5,745	9,324
Loans individually evaluated for impairment for which there is a related impairment reserve	4,328	8,572
Related impairment reserve	475	829
Loans individually evaluated for impairment for which there is no related reserve	$ 1,417	$ 752

Loans receivable - Roll Forward

Loans receivable - Roll Forward of Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract	Dec. 31, 2017USD ($)
Number of contracts
Beginning balance | contract	205	203	205	225
Number of contracts new TDRs | contract	7	6	26	13
Number of re-modified TDRs | contract	3	2	3	3
Ending balance | contract	197	201	197	201
Amount
Beginning TDR balance	$ 30,662	$ 41,860	$ 32,104	$ 42,926
New TDRs	647	546	6,443	4,685
Re-modified TDRs	306	265	306	710
Net paydowns	(1,215)	(987)	(3,037)	(3,668)
Ending TDR balance	29,147	38,469	29,147	38,469
Accruing TDRs	19,370	20,660	19,370	20,660
Non-accrual TDRs	$ 9,777	$ 17,809	$ 9,777	$ 17,809	$ 12,300
Residential mortgage loans
Number of contracts
Number of contracts charged off | contract	0	0	1	0
Number of contracts paid off | contract	2	0	4	0
Amount
Amount of contracts charged off	$ 0	$ 0	$ (135)	$ 0
Amount of contracts paid off	$ (2)	$ 0	$ (257)	$ 0
Home equity loans
Number of contracts
Number of contracts charged off | contract	0	0	0	0
Number of contracts paid off | contract	2	3	4	8
Amount
Amount of contracts charged off	$ 0	$ 0	$ 0	$ 0
Amount of contracts paid off	$ (12)	$ (30)	$ (59)	$ (62)
Commercial real estate loans
Number of contracts
Number of contracts charged off | contract	1	2	2	2
Number of contracts paid off | contract	2	1	9	11
Amount
Amount of contracts charged off	$ (91)	$ (2,498)	$ (294)	$ (2,498)
Amount of contracts paid off	$ (360)	$ (564)	$ (2,183)	$ (1,109)
Commercial loans
Number of contracts
Number of contracts charged off | contract	5	0	6	6
Number of contracts paid off | contract	3	2	8	10
Amount
Amount of contracts charged off	$ (619)	$ 0	$ (1,340)	$ (259)
Amount of contracts paid off	$ (169)	$ (123)	$ (2,401)	$ (2,256)

Loans receivable - Troubled Deb

Loans receivable - Troubled Debt Restructuring (Including Re-Modified TDRs) by Portfolio Segment and by Class of Financing Receivable (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	10	8	29	16
Recorded investment at the time of modification	$ 953	$ 811	$ 6,749	$ 5,395
Current recorded investment	941	807	5,756	5,029
Current allowance	$ 129	$ 154	$ 293	$ 527
Troubled debt restructurings modified within the previous twelve months that have subsequently defaulted:
Number of contracts | contract	0	2	0	2
Recorded investment at the time of modification		$ 240		$ 240
Current recorded investment		240		240
Current allowance		$ 81		$ 81
Personal Banking
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	6	4	18	7
Recorded investment at the time of modification	$ 536	$ 525	$ 1,127	$ 1,419
Current recorded investment	535	521	1,074	1,395
Current allowance	$ 82	$ 70	$ 175	$ 158
Troubled debt restructurings modified within the previous twelve months that have subsequently defaulted:
Number of contracts | contract		0		0
Recorded investment at the time of modification		$ 0		$ 0
Current recorded investment		0		0
Current allowance		$ 0		$ 0
Personal Banking | Residential mortgage loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	2	6	5
Recorded investment at the time of modification	$ 342	$ 403	$ 616	$ 1,297
Current recorded investment	342	402	612	1,276
Current allowance	$ 35	$ 40	$ 62	$ 128
Troubled debt restructurings modified within the previous twelve months that have subsequently defaulted:
Number of contracts | contract		0		0
Recorded investment at the time of modification		$ 0		$ 0
Current recorded investment		0		0
Current allowance		$ 0		$ 0
Personal Banking | Home equity loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	2	12	2
Recorded investment at the time of modification	$ 194	$ 122	$ 511	$ 122
Current recorded investment	193	119	462	119
Current allowance	$ 47	$ 30	$ 113	$ 30
Troubled debt restructurings modified within the previous twelve months that have subsequently defaulted:
Number of contracts | contract		0		0
Recorded investment at the time of modification		$ 0		$ 0
Current recorded investment		0		0
Current allowance		$ 0		$ 0
Commercial Banking
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	4	11	9
Recorded investment at the time of modification	$ 417	$ 286	$ 5,622	$ 3,976
Current recorded investment	406	286	4,682	3,634
Current allowance	$ 47	$ 84	$ 118	$ 369
Troubled debt restructurings modified within the previous twelve months that have subsequently defaulted:
Number of contracts | contract		2		2
Recorded investment at the time of modification		$ 240		$ 240
Current recorded investment		240		240
Current allowance		$ 81		$ 81
Commercial Banking | Commercial real estate loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3	2	5	6
Recorded investment at the time of modification	$ 372	$ 114	$ 3,255	$ 3,600
Current recorded investment	361	116	3,198	3,282
Current allowance	$ 42	$ 13	$ 97	$ 285
Troubled debt restructurings modified within the previous twelve months that have subsequently defaulted:
Number of contracts | contract		1		1
Recorded investment at the time of modification		$ 90		$ 90
Current recorded investment		90		90
Current allowance		$ 11		$ 11
Commercial Banking | Commercial loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1	2	6	3
Recorded investment at the time of modification	$ 45	$ 172	$ 2,367	$ 376
Current recorded investment	45	170	1,484	352
Current allowance	$ 5	$ 71	$ 21	$ 84
Troubled debt restructurings modified within the previous twelve months that have subsequently defaulted:
Number of contracts | contract		1		1
Recorded investment at the time of modification		$ 150		$ 150
Current recorded investment		150		150
Current allowance		$ 70		$ 70

Loans receivable - Troubled D_2

Loans receivable - Troubled Debt Restructurings by Type of Modification (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract
Troubled debt restructurings
Number of contracts | contract	10	8	29	16
Troubled debt restructurings	$ 941	$ 807	$ 5,756	$ 5,029
Number of re-modified TDRs | contract	3	2	3	3
Rate
Troubled debt restructurings
Troubled debt restructurings	$ 193	$ 369	$ 229	$ 479
Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	482	2,710
Maturity date
Troubled debt restructurings
Troubled debt restructurings	748	286	1,110	924
Other
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 152	$ 3,935	$ 916
Personal Banking
Troubled debt restructurings
Number of contracts | contract	6	4	18	7
Troubled debt restructurings	$ 535	$ 521	$ 1,074	$ 1,395
Personal Banking | Rate
Troubled debt restructurings
Troubled debt restructurings	193	369	229	479
Personal Banking | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	0	0
Personal Banking | Maturity date
Troubled debt restructurings
Troubled debt restructurings	342	0	566	0
Personal Banking | Other
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 152	$ 279	$ 916
Personal Banking | Residential mortgage loans
Troubled debt restructurings
Number of contracts | contract	2	2	6	5
Troubled debt restructurings	$ 342	$ 402	$ 612	$ 1,276
Personal Banking | Residential mortgage loans | Rate
Troubled debt restructurings
Troubled debt restructurings	0	250	7	360
Personal Banking | Residential mortgage loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	0	0
Personal Banking | Residential mortgage loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	342	0	519	0
Personal Banking | Residential mortgage loans | Other
Troubled debt restructurings
Troubled debt restructurings		$ 152	$ 86	$ 916
Personal Banking | Home equity loans
Troubled debt restructurings
Number of contracts | contract	4	2	12	2
Troubled debt restructurings	$ 193	$ 119	$ 462	$ 119
Personal Banking | Home equity loans | Rate
Troubled debt restructurings
Troubled debt restructurings	193	119	222	119
Personal Banking | Home equity loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	0	0
Personal Banking | Home equity loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	0	0	47	0
Personal Banking | Home equity loans | Other
Troubled debt restructurings
Troubled debt restructurings		$ 0	$ 193	$ 0
Commercial Banking
Troubled debt restructurings
Number of contracts | contract	4	4	11	9
Troubled debt restructurings	$ 406	$ 286	$ 4,682	$ 3,634
Commercial Banking | Rate
Troubled debt restructurings
Troubled debt restructurings	0	0	0	0
Commercial Banking | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	482	2,710
Commercial Banking | Maturity date
Troubled debt restructurings
Troubled debt restructurings	406	286	544	924
Commercial Banking | Other
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 0	$ 3,656	$ 0
Commercial Banking | Commercial real estate loans
Troubled debt restructurings
Number of contracts | contract	3	2	5	6
Troubled debt restructurings	$ 361	$ 116	$ 3,198	$ 3,282
Commercial Banking | Commercial real estate loans | Rate
Troubled debt restructurings
Troubled debt restructurings	0	0	0	0
Commercial Banking | Commercial real estate loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	482	2,710
Commercial Banking | Commercial real estate loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	361	116	361	572
Commercial Banking | Commercial real estate loans | Other
Troubled debt restructurings
Troubled debt restructurings		$ 0	$ 2,355	$ 0
Commercial Banking | Commercial loans
Troubled debt restructurings
Number of contracts | contract	1	2	6	3
Troubled debt restructurings	$ 45	$ 170	$ 1,484	$ 352
Commercial Banking | Commercial loans | Rate
Troubled debt restructurings
Troubled debt restructurings	0	0	0	0
Commercial Banking | Commercial loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	0	0
Commercial Banking | Commercial loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	45	170	183	352
Commercial Banking | Commercial loans | Other
Troubled debt restructurings
Troubled debt restructurings		$ 0	$ 1,301	$ 0

Loans receivable - Loan Delinqu

Loans receivable - Loan Delinquencies (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loan payment delinquencies
Total delinquency	$ 93,571	$ 117,504
Current	7,902,491	7,675,905
Total loans	7,996,062	7,793,409
90 days or greater delinquent and accruing	441	1,412
30-59 Days delinquent
Loan payment delinquencies
Total delinquency	22,221	56,465
60-89 Days delinquent
Loan payment delinquencies
Total delinquency	18,507	16,550
90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	52,843	44,489
Personal Banking
Loan payment delinquencies
Total loans	4,895,228	4,757,947
Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total loans	2,846,834	2,776,203
Personal Banking | Home equity loans
Loan payment delinquencies
Total loans	1,272,345	1,310,355
Personal Banking | Consumer finance loans
Loan payment delinquencies
Total loans	5,888	18,619
Personal Banking | Consumer loans
Loan payment delinquencies
Total loans	770,161	652,770
Commercial Banking
Loan payment delinquencies
Total loans	3,100,834	3,035,462
Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total loans	2,518,066	2,454,726
Commercial Banking | Commercial loans
Loan payment delinquencies
Total loans	582,768	580,736
Originated
Loan payment delinquencies
Total delinquency	76,969	98,970
Current	7,239,438	6,869,363
Total loans	7,316,407	6,968,333
90 days or greater delinquent and accruing	0	0
Originated | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	17,220	48,759
Originated | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	15,953	14,647
Originated | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	43,796	35,564
Originated | Personal Banking
Loan payment delinquencies
Total delinquency	44,240	76,209
Current	4,461,974	4,209,714
Total loans	4,506,214	4,285,923
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total delinquency	17,491	42,429
Current	2,731,521	2,619,951
Total loans	2,749,012	2,662,380
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Home equity loans
Loan payment delinquencies
Total delinquency	11,753	14,470
Current	1,036,620	1,037,088
Total loans	1,048,373	1,051,558
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Consumer finance loans
Loan payment delinquencies
Total delinquency	905	3,440
Current	4,983	15,179
Total loans	5,888	18,619
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Consumer loans
Loan payment delinquencies
Total delinquency	14,091	15,870
Current	688,850	537,496
Total loans	702,941	553,366
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	14,551	41,770
Originated | Personal Banking | 30-59 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	1,404	23,786
Originated | Personal Banking | 30-59 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	4,622	6,094
Originated | Personal Banking | 30-59 Days delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	632	2,128
Originated | Personal Banking | 30-59 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	7,893	9,762
Originated | Personal Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	9,776	12,310
Originated | Personal Banking | 60-89 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	4,392	6,030
Originated | Personal Banking | 60-89 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	2,118	2,333
Originated | Personal Banking | 60-89 Days delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	234	1,113
Originated | Personal Banking | 60-89 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	3,032	2,834
Originated | Personal Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	19,913	22,129
Originated | Personal Banking | 90 Days or greater delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	11,695	12,613
Originated | Personal Banking | 90 Days or greater delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	5,013	6,043
Originated | Personal Banking | 90 Days or greater delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	39	199
Originated | Personal Banking | 90 Days or greater delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	3,166	3,274
Originated | Commercial Banking
Loan payment delinquencies
Total delinquency	32,729	22,761
Current	2,777,464	2,659,649
Total loans	2,810,193	2,682,410
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total delinquency	29,470	18,282
Current	2,247,959	2,142,930
Total loans	2,277,429	2,161,212
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | Commercial loans
Loan payment delinquencies
Total delinquency	3,259	4,479
Current	529,505	516,719
Total loans	532,764	521,198
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	2,669	6,989
Originated | Commercial Banking | 30-59 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	2,329	5,520
Originated | Commercial Banking | 30-59 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	340	1,469
Originated | Commercial Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	6,177	2,337
Originated | Commercial Banking | 60-89 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	5,370	2,133
Originated | Commercial Banking | 60-89 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	807	204
Originated | Commercial Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	23,883	13,435
Originated | Commercial Banking | 90 Days or greater delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	21,771	10,629
Originated | Commercial Banking | 90 Days or greater delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	2,112	2,806
Acquired
Loan payment delinquencies
Total delinquency	16,602	18,534
Current	663,053	806,542
Total loans	679,655	825,076
90 days or greater delinquent and accruing	441	1,412
Acquired | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	5,001	7,706
Acquired | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	2,554	1,903
Acquired | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	9,047	8,925
Acquired | Personal Banking
Loan payment delinquencies
Total delinquency	5,599	8,711
Current	383,415	463,313
Total loans	389,014	472,024
90 days or greater delinquent and accruing	335	489
Acquired | Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total delinquency	2,196	3,480
Current	95,626	110,343
Total loans	97,822	113,823
90 days or greater delinquent and accruing	329	381
Acquired | Personal Banking | Home equity loans
Loan payment delinquencies
Total delinquency	2,294	3,211
Current	221,678	255,586
Total loans	223,972	258,797
90 days or greater delinquent and accruing	0	98
Acquired | Personal Banking | Consumer loans
Loan payment delinquencies
Total delinquency	1,109	2,020
Current	66,111	97,384
Total loans	67,220	99,404
90 days or greater delinquent and accruing	6	10
Acquired | Personal Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	1,662	4,515
Acquired | Personal Banking | 30-59 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	96	1,998
Acquired | Personal Banking | 30-59 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	1,051	1,367
Acquired | Personal Banking | 30-59 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	515	1,150
Acquired | Personal Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	949	1,260
Acquired | Personal Banking | 60-89 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	312	205
Acquired | Personal Banking | 60-89 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	418	538
Acquired | Personal Banking | 60-89 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	219	517
Acquired | Personal Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	2,988	2,936
Acquired | Personal Banking | 90 Days or greater delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	1,788	1,277
Acquired | Personal Banking | 90 Days or greater delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	825	1,306
Acquired | Personal Banking | 90 Days or greater delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	375	353
Acquired | Commercial Banking
Loan payment delinquencies
Total delinquency	11,003	9,823
Current	279,638	343,229
Total loans	290,641	353,052
90 days or greater delinquent and accruing	106	923
Acquired | Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total delinquency	9,822	8,856
Current	230,815	284,658
Total loans	240,637	293,514
90 days or greater delinquent and accruing	106	923
Acquired | Commercial Banking | Commercial loans
Loan payment delinquencies
Total delinquency	1,181	967
Current	48,823	58,571
Total loans	50,004	59,538
90 days or greater delinquent and accruing	0	0
Acquired | Commercial Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	3,339	3,191
Acquired | Commercial Banking | 30-59 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	3,057	2,795
Acquired | Commercial Banking | 30-59 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	282	396
Acquired | Commercial Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	1,605	643
Acquired | Commercial Banking | 60-89 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	1,308	406
Acquired | Commercial Banking | 60-89 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	297	237
Acquired | Commercial Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	6,059	5,989
Acquired | Commercial Banking | 90 Days or greater delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	5,457	5,655
Acquired | Commercial Banking | 90 Days or greater delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	$ 602	$ 334

Loans receivable - Credit Quali

Loans receivable - Credit Quality Indicators (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Credit quality indicators
Total loans	$ 7,996,062,000	$ 7,793,409,000
Pass
Credit quality indicators
Total loans	7,682,334,000	7,452,732,000
Special mention
Credit quality indicators
Total loans	78,289,000	102,834,000
Substandard
Credit quality indicators
Total loans	235,439,000	237,843,000
Doubtful
Credit quality indicators
Total loans	0	0
Loss
Credit quality indicators
Total loans	0	0
Personal Banking
Credit quality indicators
Total loans	4,895,228,000	4,757,947,000
Personal Banking | Residential mortgage loans
Credit quality indicators
Total loans	2,846,834,000	2,776,203,000
Personal Banking | Home equity loans
Credit quality indicators
Total loans	1,272,345,000	1,310,355,000
Personal Banking | Consumer finance loans
Credit quality indicators
Total loans	5,888,000	18,619,000
Personal Banking | Consumer loans
Credit quality indicators
Total loans	770,161,000	652,770,000
Commercial Banking
Credit quality indicators
Total loans	3,100,834,000	3,035,462,000
Commercial Banking | Commercial real estate loans
Credit quality indicators
Total loans	2,518,066,000	2,454,726,000
Commercial Banking | Commercial loans
Credit quality indicators
Total loans	582,768,000	580,736,000
Originated
Credit quality indicators
Total loans	7,316,407,000	6,968,333,000
Originated | Pass
Credit quality indicators
Total loans	7,057,197,000	6,682,937,000
Originated | Special mention
Credit quality indicators
Total loans	69,103,000	94,209,000
Originated | Substandard
Credit quality indicators
Total loans	190,107,000	191,187,000
Originated | Doubtful
Credit quality indicators
Total loans	0	0
Originated | Loss
Credit quality indicators
Total loans	0	0
Originated | Personal Banking
Credit quality indicators
Total loans	4,506,214,000	4,285,923,000
Originated | Personal Banking | Pass
Credit quality indicators
Total loans	4,486,752,000	4,256,410,000
Originated | Personal Banking | Special mention
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Substandard
Credit quality indicators
Total loans	19,462,000	29,513,000
Originated | Personal Banking | Doubtful
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Loss
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Residential mortgage loans
Credit quality indicators
Total loans	2,749,012,000	2,662,380,000
Originated | Personal Banking | Residential mortgage loans | Pass
Credit quality indicators
Total loans	2,739,243,000	2,645,475,000
Originated | Personal Banking | Residential mortgage loans | Special mention
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Residential mortgage loans | Substandard
Credit quality indicators
Total loans	9,769,000	16,905,000
Originated | Personal Banking | Residential mortgage loans | Doubtful
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Residential mortgage loans | Loss
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Home equity loans
Credit quality indicators
Total loans	1,048,373,000	1,051,558,000
Originated | Personal Banking | Home equity loans | Pass
Credit quality indicators
Total loans	1,042,627,000	1,042,965,000
Originated | Personal Banking | Home equity loans | Special mention
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Home equity loans | Substandard
Credit quality indicators
Total loans	5,746,000	8,593,000
Originated | Personal Banking | Home equity loans | Doubtful
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Home equity loans | Loss
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Consumer finance loans
Credit quality indicators
Total loans	5,888,000	18,619,000
Originated | Personal Banking | Consumer finance loans | Pass
Credit quality indicators
Total loans	5,849,000	18,420,000
Originated | Personal Banking | Consumer finance loans | Special mention
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Consumer finance loans | Substandard
Credit quality indicators
Total loans	39,000	199,000
Originated | Personal Banking | Consumer finance loans | Doubtful
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Consumer finance loans | Loss
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Consumer loans
Credit quality indicators
Total loans	702,941,000	553,366,000
Originated | Personal Banking | Consumer loans | Pass
Credit quality indicators
Total loans	699,033,000	549,550,000
Originated | Personal Banking | Consumer loans | Special mention
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Consumer loans | Substandard
Credit quality indicators
Total loans	3,908,000	3,816,000
Originated | Personal Banking | Consumer loans | Doubtful
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Consumer loans | Loss
Credit quality indicators
Total loans	0	0
Originated | Commercial Banking
Credit quality indicators
Total loans	2,810,193,000	2,682,410,000
Originated | Commercial Banking | Pass
Credit quality indicators
Total loans	2,570,445,000	2,426,527,000
Originated | Commercial Banking | Special mention
Credit quality indicators
Total loans	69,103,000	94,209,000
Originated | Commercial Banking | Substandard
Credit quality indicators
Total loans	170,645,000	161,674,000
Originated | Commercial Banking | Doubtful
Credit quality indicators
Total loans	0	0
Originated | Commercial Banking | Loss
Credit quality indicators
Total loans	0	0
Originated | Commercial Banking | Commercial real estate loans
Credit quality indicators
Total loans	2,277,429,000	2,161,212,000
Originated | Commercial Banking | Commercial real estate loans | Pass
Credit quality indicators
Total loans	2,083,302,000	1,964,565,000
Originated | Commercial Banking | Commercial real estate loans | Special mention
Credit quality indicators
Total loans	47,983,000	78,699,000
Originated | Commercial Banking | Commercial real estate loans | Substandard
Credit quality indicators
Total loans	146,144,000	117,948,000
Originated | Commercial Banking | Commercial real estate loans | Doubtful
Credit quality indicators
Total loans	0	0
Originated | Commercial Banking | Commercial real estate loans | Loss
Credit quality indicators
Total loans	0	0
Originated | Commercial Banking | Commercial loans
Credit quality indicators
Total loans	532,764,000	521,198,000
Originated | Commercial Banking | Commercial loans | Pass
Credit quality indicators
Total loans	487,143,000	461,962,000
Originated | Commercial Banking | Commercial loans | Special mention
Credit quality indicators
Total loans	21,120,000	15,510,000
Originated | Commercial Banking | Commercial loans | Substandard
Credit quality indicators
Total loans	24,501,000	43,726,000
Originated | Commercial Banking | Commercial loans | Doubtful
Credit quality indicators
Total loans	0	0
Originated | Commercial Banking | Commercial loans | Loss
Credit quality indicators
Total loans	0	0
Acquired
Credit quality indicators
Total loans	679,655,000	825,076,000
Acquired | Pass
Credit quality indicators
Total loans	625,137,000	769,795,000
Acquired | Special mention
Credit quality indicators
Total loans	9,186,000	8,625,000
Acquired | Substandard
Credit quality indicators
Total loans	45,332,000	46,656,000
Acquired | Doubtful
Credit quality indicators
Total loans	0	0
Acquired | Loss
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking
Credit quality indicators
Total loans	389,014,000	472,024,000
Acquired | Personal Banking | Pass
Credit quality indicators
Total loans	385,846,000	468,961,000
Acquired | Personal Banking | Special mention
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Substandard
Credit quality indicators
Total loans	3,168,000	3,063,000
Acquired | Personal Banking | Doubtful
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Loss
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Residential mortgage loans
Credit quality indicators
Total loans	97,822,000	113,823,000
Acquired | Personal Banking | Residential mortgage loans | Pass
Credit quality indicators
Total loans	96,563,000	112,990,000
Acquired | Personal Banking | Residential mortgage loans | Special mention
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Residential mortgage loans | Substandard
Credit quality indicators
Total loans	1,259,000	833,000
Acquired | Personal Banking | Residential mortgage loans | Doubtful
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Residential mortgage loans | Loss
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Home equity loans
Credit quality indicators
Total loans	223,972,000	258,797,000
Acquired | Personal Banking | Home equity loans | Pass
Credit quality indicators
Total loans	222,610,000	257,312,000
Acquired | Personal Banking | Home equity loans | Special mention
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Home equity loans | Substandard
Credit quality indicators
Total loans	1,362,000	1,485,000
Acquired | Personal Banking | Home equity loans | Doubtful
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Home equity loans | Loss
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Consumer loans
Credit quality indicators
Total loans	67,220,000	99,404,000
Acquired | Personal Banking | Consumer loans | Pass
Credit quality indicators
Total loans	66,673,000	98,659,000
Acquired | Personal Banking | Consumer loans | Special mention
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Consumer loans | Substandard
Credit quality indicators
Total loans	547,000	745,000
Acquired | Personal Banking | Consumer loans | Doubtful
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Consumer loans | Loss
Credit quality indicators
Total loans	0	0
Acquired | Commercial Banking
Credit quality indicators
Total loans	290,641,000	353,052,000
Acquired | Commercial Banking | Pass
Credit quality indicators
Total loans	239,291,000	300,834,000
Acquired | Commercial Banking | Special mention
Credit quality indicators
Total loans	9,186,000	8,625,000
Acquired | Commercial Banking | Substandard
Credit quality indicators
Total loans	42,164,000	43,593,000
Acquired | Commercial Banking | Doubtful
Credit quality indicators
Total loans	0	0
Acquired | Commercial Banking | Loss
Credit quality indicators
Total loans	0	0
Acquired | Commercial Banking | Commercial real estate loans
Credit quality indicators
Total loans	240,637,000	293,514,000
Acquired | Commercial Banking | Commercial real estate loans | Pass
Credit quality indicators
Total loans	199,850,000	251,761,000
Acquired | Commercial Banking | Commercial real estate loans | Special mention
Credit quality indicators
Total loans	5,546,000	4,838,000
Acquired | Commercial Banking | Commercial real estate loans | Substandard
Credit quality indicators
Total loans	35,241,000	36,915,000
Acquired | Commercial Banking | Commercial real estate loans | Doubtful
Credit quality indicators
Total loans	0	0
Acquired | Commercial Banking | Commercial real estate loans | Loss
Credit quality indicators
Total loans	0	0
Acquired | Commercial Banking | Commercial loans
Credit quality indicators
Total loans	50,004,000	59,538,000
Acquired | Commercial Banking | Commercial loans | Pass
Credit quality indicators
Total loans	39,441,000	49,073,000
Acquired | Commercial Banking | Commercial loans | Special mention
Credit quality indicators
Total loans	3,640,000	3,787,000
Acquired | Commercial Banking | Commercial loans | Substandard
Credit quality indicators
Total loans	6,923,000	6,678,000
Acquired | Commercial Banking | Commercial loans | Doubtful
Credit quality indicators
Total loans	0	0
Acquired | Commercial Banking | Commercial loans | Loss
Credit quality indicators
Total loans	0	$ 0
Minimum | Special mention or substandard
Credit quality indicators
Total loans	$ 1,000,000

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Amortizable intangible assets:
Amortization expense	$ 1,462	$ 1,691	$ 4,502	$ 5,189
Estimated amortization expense
For the year ending December 31, 2018	5,848		5,848
For the year ending December 31, 2019	4,933		4,933
For the year ending December 31, 2020	4,017		4,017
For the year ending December 31, 2021	3,188		3,188
For the year ending December 31, 2022	2,456		2,456
For the year ending December 31, 2023	1,847		1,847
Core Deposits
Amortizable intangible assets:
Intangible asset - gross	63,685		63,685		$ 63,685
Less: accumulated amortization	(43,886)		(43,886)		(40,029)
Intangible asset - net	19,799		19,799		23,656
Customer and Contract
Amortizable intangible assets:
Intangible asset - gross	10,474		10,474		10,474
Less: accumulated amortization	(9,106)		(9,106)		(8,461)
Intangible asset - net	$ 1,368		$ 1,368		$ 2,013

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Changes in the carrying amount of goodwill
Balance at the beginning of the period	$ 307,420	$ 307,420
Goodwill from acquisition	0	0
Balance at the end of the period	$ 307,420	$ 307,420

Borrowed Funds (Details)

Borrowed Funds (Details)	Dec. 15, 2005USD ($)$ / sharesshares	Dec. 05, 2005USD ($)$ / sharesshares	Sep. 30, 2018USD ($)trust$ / sharesshares	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Number of statutory business trusts owned | trust			3
Junior subordinated debentures			$ 111,213,000	$ 111,213,000
Trust preferred investments
Debt Instrument [Line Items]
Maximum period for which interest payment on the subordinated debentures can be deferred			5 years
Interest deferral			$ 0
Trust preferred investments | Northwest Bancorp Capital Trust III
Debt Instrument [Line Items]
Cumulative trust preferred securities issued (in shares) | shares		50,000
Cumulative trust preferred securities issued, liquidation value per preferred security (in dollars per security) | $ / shares		$ 1,000
Total value of cumulative trust preferred securities issued		$ 50,000,000
Junior subordinated debentures			$ 51,547,000
Trust preferred investments | Northwest Bancorp Capital Trust III | LIBOR
Debt Instrument [Line Items]
Spread on variable rate basis (as a percent)		1.38%	1.38%
Effective rate (as a percent)			3.78%
Trust preferred investments | Northwest Bancorp Statutory Trust IV
Debt Instrument [Line Items]
Cumulative trust preferred securities issued (in shares) | shares	50,000
Cumulative trust preferred securities issued, liquidation value per preferred security (in dollars per security) | $ / shares	$ 1,000
Total value of cumulative trust preferred securities issued	$ 50,000,000
Junior subordinated debentures			$ 51,547,000
Trust preferred investments | Northwest Bancorp Statutory Trust IV | LIBOR
Debt Instrument [Line Items]
Spread on variable rate basis (as a percent)	1.38%		1.38%
Effective rate (as a percent)			3.71%
Interest rate swaps | LNB Trust II
Debt Instrument [Line Items]
Cumulative trust preferred securities issued (in shares) | shares			7,875
Cumulative trust preferred securities issued, liquidation value per preferred security (in dollars per security) | $ / shares			$ 1,000
Total value of cumulative trust preferred securities issued			$ 7,875,000
Junior subordinated debentures			$ 8,119,000
Interest rate swaps | LNB Trust II | LIBOR
Debt Instrument [Line Items]
Spread on variable rate basis (as a percent)			1.48%
Effective rate (as a percent)			3.81%
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 150,000,000
Revolving line of credit			85,200,000	0
Securities Sold under Agreements to Repurchase
Debt Instrument [Line Items]
Securities sold under agreements to repurchase			$ 91,800,000	$ 108,200,000

Guarantees (Details)

Guarantees (Details) - Letter of Credit $ in Thousands	Sep. 30, 2018USD ($)
Guarantor Obligations [Line Items]
Maximum potential amount of future payments	$ 33,800
Maximum exposure collateralized	27,300
Liability recognized for the obligations	$ 133

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stock options
Antidilutive securities excluded from the calculation of earnings per share
Average share price during the reporting period (in dollars per share)	$ 18.01	$ 16.26	$ 17.30	$ 16.58

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Reported net income	$ 27,740	$ 23,591	$ 79,024	$ 72,319
Weighted average common shares outstanding (in shares)	102,334,954	101,163,534	101,937,338	100,921,322
Dilutive potential shares due to effect of stock options (in shares)	1,607,741	1,400,942	1,566,731	1,617,020
Total weighted average common shares and dilutive potential shares (in shares)	103,942,695	102,564,476	103,504,069	102,538,342
Basic earnings per share (in dollars per share)	$ 0.27	$ 0.23	$ 0.78	$ 0.72
Diluted earnings per share (in dollars per share)	$ 0.27	$ 0.23	$ 0.76	$ 0.71

Pension and Other Post-retire_3

Pension and Other Post-retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pension benefits
Components of net periodic benefit cost
Service cost	$ 1,716	$ 1,537	$ 5,148	$ 4,612
Interest cost	1,678	1,719	5,034	5,159
Expected return on plan assets	(2,992)	(2,628)	(8,976)	(7,884)
Amortization of prior service cost	(581)	(580)	(1,742)	(1,742)
Amortization of the net loss	872	928	2,617	2,783
Net periodic cost	693	976	2,081	2,928
Pension benefits | Minimum
Components of net periodic benefit cost
Estimated contribution for the current year	4,000		4,000
Pension benefits | Maximum
Components of net periodic benefit cost
Estimated contribution for the current year	6,000		6,000
Other post-retirement benefits
Components of net periodic benefit cost
Service cost	0	0	0	0
Interest cost	14	17	41	51
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of the net loss	24	27	73	81
Net periodic cost	$ 38	$ 44	$ 114	$ 132

Disclosures About Fair Value _3

Disclosures About Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Significant unrealized appreciation or depreciation in financial instruments	$ 0	$ 0
Financial assets:
Securities available-for-sale	811,556,000	792,535,000
Securities held-to-maturity	23,534,000	29,667,000
Accrued interest receivable	25,798,000	23,352,000
Interest rate swaps	4,386,000	214,000
Financial liabilities:
Borrowed funds	179,117,000	108,238,000
Junior subordinated debentures	111,213,000	111,213,000
Interest rate swaps	4,479,000	1,339,000
Level 1
Financial assets:
Cash and cash equivalents	73,946,000	77,710,000
Securities available-for-sale	0	574,000
Securities held-to-maturity	0	0
Loans receivable, net	0	3,128,000
Accrued interest receivable	25,798,000	23,352,000
Interest rate swaps		0
FHLB Stock	0	0
Total financial assets	99,744,000	104,764,000
Financial liabilities:
Savings and checking deposits	6,550,748,000	6,414,366,000
Time deposits	0	0
Borrowed funds	179,111,000	108,238,000
Junior subordinated debentures	0	0
Accrued interest payable	627,000	460,000
Total financial liabilities	6,730,486,000	6,523,064,000
Level 2
Financial assets:
Cash and cash equivalents	0	0
Securities available-for-sale	811,556,000	791,961,000
Securities held-to-maturity	23,534,000	29,667,000
Loans receivable, net	0	0
Accrued interest receivable	0	0
Interest rate swaps		214,000
FHLB Stock	0	0
Total financial assets	839,476,000	821,842,000
Financial liabilities:
Savings and checking deposits	0	0
Time deposits	0	0
Borrowed funds	0	0
Junior subordinated debentures	0	0
Accrued interest payable	0	0
Total financial liabilities	4,479,000	1,339,000
Level 3
Financial assets:
Cash and cash equivalents	0	0
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Loans receivable, net	7,721,559,000	7,759,434,000
Accrued interest receivable	0	0
Interest rate swaps		0
FHLB Stock	15,452,000	11,733,000
Total financial assets	7,737,011,000	7,771,167,000
Financial liabilities:
Savings and checking deposits	0	0
Time deposits	1,431,500,000	1,433,380,000
Borrowed funds	0	0
Junior subordinated debentures	104,609,000	110,954,000
Accrued interest payable	0	0
Total financial liabilities	1,536,109,000	1,544,334,000
Carrying amount
Financial assets:
Cash and cash equivalents	73,946,000	77,710,000
Securities available-for-sale	811,556,000	792,535,000
Securities held-to-maturity	24,222,000	29,678,000
Loans receivable, net	7,940,087,000	7,736,614,000
Accrued interest receivable	25,798,000	23,352,000
Interest rate swaps		214,000
FHLB Stock	15,452,000	11,733,000
Total financial assets	8,895,447,000	8,671,836,000
Financial liabilities:
Savings and checking deposits	6,550,748,000	6,414,366,000
Time deposits	1,403,205,000	1,412,623,000
Borrowed funds	179,117,000	108,238,000
Junior subordinated debentures	111,213,000	111,213,000
Accrued interest payable	627,000	460,000
Total financial liabilities	8,249,389,000	8,048,239,000
Estimated fair value
Financial assets:
Cash and cash equivalents	73,946,000	77,710,000
Securities available-for-sale	811,556,000	792,535,000
Securities held-to-maturity	23,534,000	29,667,000
Loans receivable, net	7,721,559,000	7,762,562,000
Accrued interest receivable	25,798,000	23,352,000
Interest rate swaps		214,000
FHLB Stock	15,452,000	11,733,000
Total financial assets	8,676,231,000	8,697,773,000
Financial liabilities:
Savings and checking deposits	6,550,748,000	6,414,366,000
Time deposits	1,431,500,000	1,433,380,000
Borrowed funds	179,111,000	108,238,000
Junior subordinated debentures	104,609,000	110,954,000
Accrued interest payable	627,000	460,000
Total financial liabilities	8,271,074,000	8,068,737,000
Interest rate swaps
Financial liabilities:
Interest rate swaps	(93,000)
Interest rate swaps | Level 1
Financial assets:
Interest rate swaps	0
Financial liabilities:
Interest rate swaps	0	0
Interest rate swaps | Level 2
Financial assets:
Interest rate swaps	4,386,000
Financial liabilities:
Interest rate swaps	4,479,000	1,278,000
Interest rate swaps | Level 3
Financial assets:
Interest rate swaps	0
Financial liabilities:
Interest rate swaps	0	0
Interest rate swaps | Carrying amount
Financial assets:
Interest rate swaps	4,386,000
Financial liabilities:
Interest rate swaps	4,479,000	1,278,000
Interest rate swaps | Estimated fair value
Financial assets:
Interest rate swaps	4,386,000
Financial liabilities:
Interest rate swaps	$ 4,479,000	1,278,000
Foreign exchange swaps | Level 1
Financial liabilities:
Interest rate swaps		0
Foreign exchange swaps | Level 2
Financial liabilities:
Interest rate swaps		61,000
Foreign exchange swaps | Level 3
Financial liabilities:
Interest rate swaps		0
Foreign exchange swaps | Carrying amount
Financial liabilities:
Interest rate swaps		61,000
Foreign exchange swaps | Estimated fair value
Financial liabilities:
Interest rate swaps		$ 61,000

Disclosures About Fair Value _4

Disclosures About Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	$ 811,556	$ 792,535
Interest rate swaps	4,386	214
Interest rate swaps	4,479	1,339
Level 1
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	574
Interest rate swaps		0
Total financial assets	99,744	104,764
Level 2
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	811,556	791,961
Interest rate swaps		214
Total financial assets	839,476	821,842
Level 3
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Interest rate swaps		0
Total financial assets	7,737,011	7,771,167
Measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis
Total financial assets	815,942	792,749
Total Liabilities	4,479	1,339
Measured on recurring basis | Equity securities
Assets and liabilities measured at fair value on a recurring basis
Equity securities		574
Measured on recurring basis | Debt securities
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	226,796	261,235
Measured on recurring basis | Debt securities | U.S. government and agencies
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	14,695	1
Measured on recurring basis | Debt securities | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	186,445	209,269
Measured on recurring basis | Debt securities | States and political subdivisions
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	24,744	51,056
Measured on recurring basis | Debt securities | Corporate
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	912	909
Measured on recurring basis | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	584,760	530,726
Measured on recurring basis | Residential mortgage-backed securities | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	27,820	29,695
Measured on recurring basis | Residential mortgage-backed securities | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	71,251	82,969
Measured on recurring basis | Residential mortgage-backed securities | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	53,907	64,021
Measured on recurring basis | Residential mortgage-backed securities | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	535	555
Measured on recurring basis | Collateralized mortgage obligations | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	53,969	4,769
Measured on recurring basis | Collateralized mortgage obligations | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	205,066	191,512
Measured on recurring basis | Collateralized mortgage obligations | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	172,212	157,190
Measured on recurring basis | Collateralized mortgage obligations | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	15
Measured on recurring basis | Interest rate swaps
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	4,386	214
Interest rate swaps	4,479	1,278
Measured on recurring basis | Foreign exchange swaps
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps		61
Measured on recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Total financial assets	0	574
Total Liabilities	0	0
Measured on recurring basis | Level 1 | Equity securities
Assets and liabilities measured at fair value on a recurring basis
Equity securities		574
Measured on recurring basis | Level 1 | Debt securities
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Measured on recurring basis | Level 1 | Debt securities | U.S. government and agencies
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Measured on recurring basis | Level 1 | Debt securities | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Measured on recurring basis | Level 1 | Debt securities | States and political subdivisions
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Measured on recurring basis | Level 1 | Debt securities | Corporate
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Measured on recurring basis | Level 1 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 1 | Residential mortgage-backed securities | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 1 | Residential mortgage-backed securities | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 1 | Residential mortgage-backed securities | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 1 | Residential mortgage-backed securities | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 1 | Collateralized mortgage obligations | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 1 | Collateralized mortgage obligations | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 1 | Collateralized mortgage obligations | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 1 | Collateralized mortgage obligations | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 1 | Interest rate swaps
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	0	0
Interest rate swaps	0	0
Measured on recurring basis | Level 1 | Foreign exchange swaps
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps		0
Measured on recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Total financial assets	815,942	792,175
Total Liabilities	4,479	1,339
Measured on recurring basis | Level 2 | Equity securities
Assets and liabilities measured at fair value on a recurring basis
Equity securities		0
Measured on recurring basis | Level 2 | Debt securities
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	226,796	261,235
Measured on recurring basis | Level 2 | Debt securities | U.S. government and agencies
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	14,695	1
Measured on recurring basis | Level 2 | Debt securities | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	186,445	209,269
Measured on recurring basis | Level 2 | Debt securities | States and political subdivisions
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	24,744	51,056
Measured on recurring basis | Level 2 | Debt securities | Corporate
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	912	909
Measured on recurring basis | Level 2 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	584,760	530,726
Measured on recurring basis | Level 2 | Residential mortgage-backed securities | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	27,820	29,695
Measured on recurring basis | Level 2 | Residential mortgage-backed securities | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	71,251	82,969
Measured on recurring basis | Level 2 | Residential mortgage-backed securities | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	53,907	64,021
Measured on recurring basis | Level 2 | Residential mortgage-backed securities | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	535	555
Measured on recurring basis | Level 2 | Collateralized mortgage obligations | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	53,969	4,769
Measured on recurring basis | Level 2 | Collateralized mortgage obligations | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	205,066	191,512
Measured on recurring basis | Level 2 | Collateralized mortgage obligations | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	172,212	157,190
Measured on recurring basis | Level 2 | Collateralized mortgage obligations | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	15
Measured on recurring basis | Level 2 | Interest rate swaps
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	4,386	214
Interest rate swaps	4,479	1,278
Measured on recurring basis | Level 2 | Foreign exchange swaps
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps		61
Measured on recurring basis | Level 3
Assets and liabilities measured at fair value on a recurring basis
Total financial assets	0	0
Total Liabilities	0	0
Measured on recurring basis | Level 3 | Equity securities
Assets and liabilities measured at fair value on a recurring basis
Equity securities		0
Measured on recurring basis | Level 3 | Debt securities
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Measured on recurring basis | Level 3 | Debt securities | U.S. government and agencies
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Measured on recurring basis | Level 3 | Debt securities | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Measured on recurring basis | Level 3 | Debt securities | States and political subdivisions
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Measured on recurring basis | Level 3 | Debt securities | Corporate
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Measured on recurring basis | Level 3 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 3 | Residential mortgage-backed securities | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 3 | Residential mortgage-backed securities | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 3 | Residential mortgage-backed securities | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 3 | Residential mortgage-backed securities | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 3 | Collateralized mortgage obligations | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 3 | Collateralized mortgage obligations | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 3 | Collateralized mortgage obligations | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 3 | Collateralized mortgage obligations | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Measured on recurring basis | Level 3 | Interest rate swaps
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	0	0
Interest rate swaps	$ 0	0
Measured on recurring basis | Level 3 | Foreign exchange swaps
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps		$ 0

Disclosures About Fair Value _5

Disclosures About Fair Value of Financial Instruments - Reconciliation of all Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - Level 3 - Debt securities - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Beginning balance January 1,	$ 0	$ 10,638	$ 0	$ 9,366
Total net realized investment gains/ (losses) and net change in unrealized appreciation/ (depreciation):
Included in net income as OTTI	0	0	0	0
Included in other comprehensive income	0	21	0	1,293
Purchases	0	0	0	0
Sales	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
September 30	$ 0	$ 10,659	$ 0	$ 10,659

Disclosures About Fair Value _6

Disclosures About Fair Value of Financial Instruments - Nonrecurring Assets that had Fair Market Values Below the Carrying Amount (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loans measured for impairment
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	$ 37,932
Real estate owned
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	2,486
Level 1
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	99,744	$ 104,764
Level 2
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	839,476	821,842
Level 3
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	7,737,011	7,771,167
Fair Value, Measurements, Nonrecurring
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	40,418	39,087
Fair Value, Measurements, Nonrecurring | Loans measured for impairment
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	37,932	33,421
Fair Value, Measurements, Nonrecurring | Real estate owned
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	2,486	5,666
Fair Value, Measurements, Nonrecurring | Level 1
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	0	0
Fair Value, Measurements, Nonrecurring | Level 1 | Loans measured for impairment
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	0	0
Fair Value, Measurements, Nonrecurring | Level 1 | Real estate owned
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	0	0
Fair Value, Measurements, Nonrecurring | Level 2
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	0	0
Fair Value, Measurements, Nonrecurring | Level 2 | Loans measured for impairment
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	0	0
Fair Value, Measurements, Nonrecurring | Level 2 | Real estate owned
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	0	0
Fair Value, Measurements, Nonrecurring | Level 3
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	40,418	39,087
Fair Value, Measurements, Nonrecurring | Level 3 | Loans measured for impairment
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	37,932	33,421
Fair Value, Measurements, Nonrecurring | Level 3 | Real estate owned
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total financial assets	$ 2,486	$ 5,666

Disclosures About Fair Value _7

Disclosures About Fair Value of Financial Instruments - Additional Quantitative Information, Assets Measured at Fair Value, Recurring and Nonrecurring Basis, Level 3 Input (Details) $ in Thousands	Sep. 30, 2018USD ($)
Loans measured for impairment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total financial assets	$ 37,932
Real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total financial assets	$ 2,486
Estimated cost to sell | Loans measured for impairment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cost to sell loans measured for impairment	0.100
Estimated cost to sell | Real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cost to sell	0.100
Discount rate | Loans measured for impairment | Discounted cash flow | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cost to sell loans measured for impairment	0.0425
Discount rate | Loans measured for impairment | Discounted cash flow | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cost to sell loans measured for impairment	0.100
Discount rate | Loans measured for impairment | Discounted cash flow | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cost to sell loans measured for impairment	0.0750

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details)	9 Months Ended
	Sep. 30, 2018USD ($)derivative	Dec. 31, 2017USD ($)
Derivative [Line Items]
Interest rate swaps	$ 4,479,000	$ 1,339,000
Interest rate swaps
Derivative [Line Items]
Number of agreements | derivative	1
Cash pledged as collateral to the counterparty	$ 255,000
Interest rate swaps	$ (93,000)
Trust preferred investments | Northwest Bancorp Capital Trust III | Interest rate swaps
Derivative [Line Items]
Original term of swaps	10 years
Fixed rate (as a percent)	4.09%
Trust preferred investments | Northwest Bancorp Statutory Trust IV | Interest rate swaps
Derivative [Line Items]
Notional amount	$ 25,000,000

Derivative Financial Instrume_4

Derivative Financial Instruments - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Asset Derivatives, Notional Amount	$ 209,353	$ 92,631
Asset Derivatives, Fair Value	4,386	214
Liability Derivatives, Notional Amount	234,353	154,975
Liability Derivatives, Fair Value	4,479	1,339
Interest rate swaps
Derivative [Line Items]
Liability Derivatives, Fair Value	(93)
Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Asset Derivatives, Notional Amount	0	0
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Notional Amount	25,000	50,000
Liability Derivatives, Fair Value	93	1,064
Not Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Asset Derivatives, Notional Amount	209,353	92,631
Asset Derivatives, Fair Value	4,386	214
Liability Derivatives, Notional Amount	209,353	92,631
Liability Derivatives, Fair Value	$ 4,386	214
Not Designated as Hedging Instrument | Foreign exchange swaps
Derivative [Line Items]
Asset Derivatives, Notional Amount		0
Asset Derivatives, Fair Value		0
Liability Derivatives, Notional Amount		12,344
Liability Derivatives, Fair Value		$ 61

Derivative Financial Instrume_5

Derivative Financial Instruments - Gain (Loss) on Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Hedging interest rate derivatives:
Increase in interest expense	$ 257	$ 393	$ 857	$ 1,216
Non-hedging swap derivatives:
Increase/ (decrease) in other income	$ 0	$ 99	$ (288)	$ 333

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Income/ (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Changes in accumulated other comprehensive income by component
Balance beginning of the period	$ 1,228,880	$ 1,196,930	$ 1,207,724	$ 1,170,663
Reclassification due to adoption of ASU No. 2018-02	(6,700)
Other comprehensive income/ (loss) before reclassification adjustments	(1,778)	(6)
Amounts reclassified from accumulated other comprehensive income	182	(453)
Other comprehensive income/ (loss)	(1,596)	(459)	(5,863)	2,384
Balance end of the period	1,240,676	1,205,847	1,240,676	1,205,847
Reclassification adjustment for gains included in net income, net of tax	44	674	138	741
Reclassification adjustment for gains included in net income, tax	(17)	(369)	(54)	(416)
Reclassification adjustment for prior period service costs included in net income, net of tax	226	221	678	662
Reclassification adjustment for prior period service costs included in net income, tax	90	153	271	460
Unrealized gains and (losses) on securities available-for-sale
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(10,693)	2,276	(4,409)	395
Reclassification due to adoption of ASU No. 2018-02			(991)
Other comprehensive income/ (loss) before reclassification adjustments	(1,970)	(264)	(7,169)	1,684
Amounts reclassified from accumulated other comprehensive income	(44)	(674)	(138)	(741)
Other comprehensive income/ (loss)	(2,014)	(938)	(7,307)	943
Balance end of the period	(12,707)	1,338	(12,707)	1,338
Reclassification adjustment for gains included in net income, net of tax	61	1,043	192	1,157
Reclassification adjustment for gains included in net income, tax	(17)	(369)	54	(416)
Change in fair value of interest rate swaps
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(266)	(1,257)	(691)	(1,778)
Reclassification due to adoption of ASU No. 2018-02			(149)
Other comprehensive income/ (loss) before reclassification adjustments	192	258	766	779
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other comprehensive income/ (loss)	192	258	766	779
Balance end of the period	(74)	(999)	(74)	(999)
Change in defined benefit pension plans
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(32,134)	(26,167)	(26,980)	(26,608)
Reclassification due to adoption of ASU No. 2018-02			(5,606)
Other comprehensive income/ (loss) before reclassification adjustments	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	226	221	678	662
Other comprehensive income/ (loss)	226	221	678	662
Balance end of the period	(31,908)	(25,946)	(31,908)	(25,946)
Reclassification adjustment for prior period service costs included in net income, net of tax	581	580	1,742	1,742
Reclassification adjustment for defined benefit plan loss included in net income, net of tax	(897)	(954)	(2,691)	(2,864)
Reclassification adjustment for prior period service costs included in net income, tax	90	153	271	460
Total
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(43,093)	(25,148)	(32,080)	(27,991)
Reclassification due to adoption of ASU No. 2018-02			(6,746)
Other comprehensive income/ (loss) before reclassification adjustments			(6,403)	2,463
Amounts reclassified from accumulated other comprehensive income			540	(79)
Other comprehensive income/ (loss)			(5,863)	2,384
Balance end of the period	$ (44,689)	$ (25,607)	$ (44,689)	$ (25,607)