Northwest Bancshares (NWBI) 10-Q 10 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 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	Mar. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding (in shares)		102,603,615
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 192,158	$ 77,710
Marketable securities (amortized cost of $771,110)	757,976
Marketable securities available-for-sale (amortized cost of $800,094)		792,535
Marketable securities held-to-maturity (fair value of $27,324 and $29,667)	27,709	29,678
Total cash and cash equivalents and marketable securities	977,843	899,923
Personal Banking loans:
Residential mortgage loans held-for-sale	0	3,128
Residential mortgage loans	2,772,148	2,773,075
Home equity loans	1,288,361	1,310,355
Consumer loans	686,038	671,389
Total Personal Banking loans	4,746,547	4,757,947
Commercial Banking loans:
Commercial real estate loans	2,512,257	2,454,726
Commercial loans	623,463	580,736
Total Commercial Banking loans	3,135,720	3,035,462
Total loans	7,882,267	7,793,409
Allowance for loan losses	(55,211)	(56,795)
Total loans, net	7,827,056	7,736,614
Federal Home Loan Bank stock, at cost	7,694	11,733
Accrued interest receivable	23,051	23,352
Real estate owned, net	4,041	5,666
Premises and equipment, net	148,184	151,944
Bank owned life insurance	172,537	171,547
Goodwill	307,420	307,420
Other intangible assets	24,149	25,669
Other assets	29,004	30,066
Total assets	9,520,979	9,363,934
Liabilities:
Noninterest-bearing checking deposits	1,679,853	1,610,409
Interest-bearing checking deposits	1,476,177	1,442,928
Money market deposit accounts	1,707,837	1,707,450
Savings deposits	1,701,022	1,653,579
Time deposits	1,420,600	1,412,623
Total deposits	7,985,489	7,826,989
Borrowed funds	104,558	108,238
Junior subordinated deferrable interest debentures held by trusts that issued guaranteed capital debt securities	111,213	111,213
Advances by borrowers for taxes and insurance	43,654	40,825
Accrued interest payable	528	460
Other liabilities	60,283	68,485
Total liabilities	8,305,725	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, 102,599,662 and 102,394,828 shares issued, respectively	1,026	1,027
Paid-in capital	734,065	730,719
Retained earnings	522,384	508,058
Accumulated other comprehensive loss	(42,221)	(32,080)
Total shareholders’ equity	1,215,254	1,207,724
Total liabilities and shareholders’ equity	$ 9,520,979	$ 9,363,934

CONSOLIDATED STATEMENTS OF FIN3

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Marketable securities available-for-sale, amortized cost	$ 771,110	$ 800,094
Marketable securities held-to-maturity, fair value	$ 27,324	$ 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)	102,599,662	102,394,828

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income:
Loans receivable	$ 85,220	$ 82,751
Mortgage-backed securities	3,013	2,222
Taxable investment securities	678	1,006
Tax-free investment securities	390	569
FHLB dividends	97	59
Interest-earning deposits	135	660
Total interest income	89,533	87,267
Interest expense:
Deposits	6,458	5,465
Borrowed funds	1,308	1,225
Total interest expense	7,766	6,690
Net interest income	81,767	80,577
Provision for loan losses	4,209	4,637
Net interest income after provision for loan losses	77,558	75,940
Noninterest income:
Gain on sale of investments	153	17
Service charges and fees	11,899	11,717
Trust and other financial services income	4,031	4,304
Insurance commission income	2,749	2,794
(Loss)/ gain on real estate owned, net	(546)	(67)
Income from bank owned life insurance	990	1,068
Mortgage banking income	224	240
Other operating income	2,288	1,431
Total noninterest income	21,788	21,504
Noninterest expense:
Compensation and employee benefits	36,510	38,272
Premises and occupancy costs	7,307	7,516
Office operations	3,408	4,222
Collections expense	512	549
Processing expenses	9,706	9,909
Marketing expenses	2,140	2,148
Federal deposit insurance premiums	717	1,167
Professional services	2,277	2,575
Amortization of intangible assets	1,520	1,749
Real estate owned expense	292	282
Restructuring/ acquisition expense	0	223
Other expenses	3,032	3,034
Total noninterest expense	67,421	71,646
Income before income taxes	31,925	25,798
Federal and state income taxes expense	6,940	8,052
Net income	$ 24,985	$ 17,746
Basic earnings per share (in dollars per share)	$ 0.25	$ 0.18
Diluted earnings per share (in dollars per share)	$ 0.24	$ 0.17

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 24,985	$ 17,746
Net unrealized holding gains/ (losses) on marketable securities:
Unrealized holding losses net of tax of $1,587 and $(314), respectively	(3,955)	658
Reclassification adjustment for gains included in net income, net of tax of $7 and $8, respectively	(26)	(11)
Net unrealized holding gains on marketable securities	(3,981)	647
Change in fair value of interest rate swaps, net of tax of $(95) and $(163), respectively	360	303
Defined benefit plan:
Reclassification adjustments for prior period service costs and net losses included in net income, net of tax of $(90) and $(153), respectively	226	220
Other comprehensive income/ (loss)	(3,395)	1,170
Total comprehensive income	$ 21,590	$ 18,916

CONSOLIDATED STATEMENTS OF COM6

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Unrealized holding losses, tax	$ 1,587	$ (314)
Reclassification adjustment for gains included in net income, tax	7	8
Change in fair value of interest rate swaps, tax	(95)	(163)
Reclassification adjustments for prior period service costs and net losses included in net income, tax	$ (90)	$ (153)

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 Income/ (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	17,746			17,746
Other comprehensive income, net	1,170				1,170
Total comprehensive income	18,916			17,746	1,170
Exercise of stock options (in shares)		288,536
Exercise of stock options	3,306	$ 3	3,303
Stock-based compensation expense, including tax benefit	918		918
Dividends paid, per share amount	(16,240)			(16,240)
Balance end of period (in shares) at Mar. 31, 2017		101,987,942
Balance end of the period at Mar. 31, 2017	1,177,563	$ 1,020	723,055	480,309	(26,821)
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	(6,746)
Comprehensive income:
Net income	24,985			24,985
Other comprehensive income, net	(3,395)				(3,395)
Total comprehensive income	21,590			31,731	(10,141)
Exercise of stock options (in shares)		204,834
Exercise of stock options	2,367	$ 2	2,365
Stock-based compensation expense, including tax benefit	978		978
Stock-based compensation forfeited		$ (3)	3
Dividends paid, per share amount	(17,405)			(17,405)
Balance end of period (in shares) at Mar. 31, 2018		102,599,662
Balance end of the period at Mar. 31, 2018	$ 1,215,254	$ 1,026	$ 734,065	$ 522,384	$ (42,221)

CONSOLIDATED STATEMENTS OF CHA8

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Other comprehensive income, tax	$ 1,409	$ (622)
Dividends paid, per share (in dollars per share)	$ 0.17	$ 0.16

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES:
Net income	$ 24,985	$ 17,746
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	4,209	4,637
Net (gain)/ loss on sale of assets	1,009	(410)
Net depreciation, amortization and accretion	3,753	5,582
Decrease in other assets	1,294	7,634
Decrease in other liabilities	(7,364)	(4,465)
Net amortization on marketable securities	466	518
Noncash write-down of real estate owned	774	418
Origination of loans held for sale	(1,297)	(18,579)
Proceeds from sale of loans held for sale	4,501	26,653
Noncash compensation expense related to stock benefit plans	978	918
Net increase in assets and liabilities held-for-sale	0	3,382
Net cash provided by operating activities	33,308	44,034
INVESTING ACTIVITIES:
Purchase of marketable securities held-to-maturity	0	(23,621)
Purchase of marketable securities available-for-sale	(14,250)	(80,346)
Proceeds from maturities and principal reductions of marketable securities held-to-maturity	1,965	1,708
Proceeds from maturities and principal reductions of marketable securities available-for-sale	37,721	30,955
Proceeds from sale of marketable securities available-for-sale	5,206	0
Loan originations	(723,096)	(619,637)
Proceeds from loan maturities and principal reductions	624,663	601,464
Net sale of Federal Home Loan Bank stock	4,039	28
Proceeds from sale of real estate owned	2,618	1,217
Sale of real estate owned for investment, net	152	152
Purchase of premises and equipment	(489)	(2,256)
Net cash used in investing activities	(61,471)	(90,336)
FINANCING ACTIVITIES:
Increase in deposits, net	158,500	103,434
Net decrease in short-term borrowings	(3,680)	(5,708)
Increase in advances by borrowers for taxes and insurance	2,829	3,591
Cash dividends paid	(17,405)	(16,240)
Proceeds from stock options exercised	2,367	3,306
Net cash provided by financing activities	142,611	88,383
Net increase in cash and cash equivalents	114,448	42,081
Cash and cash equivalents at beginning of period	77,710	389,867
Net increase in cash and cash equivalents	114,448	42,081
Cash and cash equivalents at end of period	192,158	431,948
Cash paid during the period for:
Interest on deposits and borrowings (including interest credited to deposit accounts of $6,171 and $5,412, respectively)	7,698	6,747
Income taxes	1,367	0
Non-cash activities:
Loans foreclosures and repossessions	2,396	3,251
Sale of real estate owned financed by the Company	$ 183	$ 168

CONSOLIDATED STATEMENTS OF CA10

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Interest on deposits and borrowings, interest credited to deposit accounts	$ 6,171	$ 5,412

Basis of Presentation and Infor

Basis of Presentation and Informational Disclosures	3 Months Ended
	Mar. 31, 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 ended March 31, 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 Stock-based compensation expense of $978,000 and $918,000 for the quarters ended March 31, 2018 and 2017 , respectively, was recognized in compensation expense relating to our stock benefit plans. At March 31, 2018 there was compensation expense of $3.7 million to be recognized for awarded but unvested stock options and $14.6 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 March 31, 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 , 2015 and 2014. 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) ”. On January 1, 2018, we adopted ASC 606, Revenue from Contracts with Customers 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 customer 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 cardholders 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 customer. Loss on real estate owned represents gain 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 transfer 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 to which we expect, 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 on January 1, 2018 and are required to apply it on a retrospective basis. No reclassifications were made for the quarter 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, the amendments were applied on a prospective basis and the adoption did not have a significant impact on the consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business”. This guidance provides a more robust framework to use in determining when a set of assets and activities (“set”) is a business and to address stakeholder feedback that the definition of a business in current GAAP is applied too broadly. The primary amendments in the ASU provide a screen to exclude transactions where substantially all of the fair value of the transferred set is concentrated in a single asset, or group of similar assets, from being evaluated as a business. We adopted this standard on January 1, 2018 and will apply the guidance to future transactions. 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 ended March 31, 2017 totaled $517,000 and were reclassified from compensation and employee benefits to other expense. In March 2017 the FASB issued ASU 2017-08, "Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities". This guidance shortens the amortization period for certain callable debt securities held at a premium to the earliest call date from the maturity date. This guidance is effective for annual and interim periods beginning after December 15, 2018. Early adoption is permitted in any interim period. We have elected to early adopt this standard as of January 1, 2018. The adoption did not have a material impact on our results of operations or financial position. In May 2017 the FASB issued ASU 2017-09, “Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting”. This guidance clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. Under ASU 2017-09, an entity will not apply modification accounting to a share-based payment award if all of the following are the same immediately before and after the change: (i) the award's fair value, (ii) the award's vesting conditions and (iii) the award's classification as an equity or liability instrument. This guidance is effective for annual and interim periods beginning after December 15, 2017 and should be applied on a prospective basis to an award modified on or after the adoption date. We adopted this standard as of January 1, 2018 and will apply the guidance to future modifications. 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 standard income tax effects relating to the unrealized 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 as 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-to-use assets and lease obligations under the ASU as a result of our minimum commitments under non-cancellable operating lease. Our current minimum commitments under non-cancellable operating leases are disclosed in Note 7, “Premises and Equipment” on our 2017 Annual Report on Form 10-K. 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 requiring, instead, 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 asset(s) 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, 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 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.

Investment securities and impai

Investment securities and impairment of investment securities	3 Months Ended
	Mar. 31, 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 March 31, 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 in one year or less $ 1 — — 1 Debt issued by government sponsored enterprises: Due in one year or less 66,007 1 (241 ) 65,767 Due after one year through five years 135,355 — (3,139 ) 132,216 Due after ten years 4,381 — (69 ) 4,312 Municipal securities: Due in one year or less 2,487 10 — 2,497 Due after one year through five years 5,115 59 (10 ) 5,164 Due after five years through ten years 15,168 95 (15 ) 15,248 Due after ten years 18,085 113 (6 ) 18,192 Corporate debt issues: Due after ten years 910 — — 910 Residential mortgage-backed securities: Fixed rate pass-through 142,425 843 (4,605 ) 138,663 Variable rate pass-through 31,270 1,301 (6 ) 32,565 Fixed rate non-agency CMOs 1 — — 1 Fixed rate agency CMOs 278,288 21 (7,833 ) 270,476 Variable rate agency CMOs 71,617 381 (34 ) 71,964 Total residential mortgage-backed securities 523,601 2,546 (12,478 ) 513,669 Total marketable securities available-for-sale $ 771,110 2,824 (15,958 ) 757,976 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 March 31, 2018 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through 3,489 98 — 3,587 Variable rate pass-through 2,185 58 — 2,243 Fixed rate agency CMOs 21,363 4 (556 ) 20,811 Variable rate agency CMOs 672 11 — 683 Total residential mortgage-backed securities 27,709 171 (556 ) 27,324 Total marketable securities held-to-maturity $ 27,709 171 (556 ) 27,324 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 March 31, 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 $ 4,982 (29 ) 191,381 (3,420 ) 196,363 (3,449 ) Municipal securities 7,127 (31 ) — — 7,127 (31 ) Residential mortgage-backed securities - agency 250,025 (5,178 ) 190,659 (7,856 ) 440,684 (13,034 ) Total temporarily impaired securities $ 262,134 (5,238 ) 382,040 (11,276 ) 644,174 (16,514 ) 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 ended March 31 : 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 securities sold/ called realized during the quarter (352 ) — Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized — — Ending balance at March 31, $ — 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	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans receivable	Loans receivable The following table shows a summary of our loans receivable at March 31, 2018 and December 31, 2017 (in thousands): March 31, 2018 December 31, Originated Acquired Total Originated Acquired Total Personal Banking: Residential mortgage loans (1) $ 2,658,404 108,570 2,766,974 2,658,726 113,823 2,772,549 Home equity loans 1,040,328 248,033 1,288,361 1,051,558 258,797 1,310,355 Consumer finance loans (2) 12,453 — 12,453 18,619 — 18,619 Consumer loans 574,054 84,147 658,201 540,832 97,877 638,709 Total Personal Banking 4,285,239 440,750 4,725,989 4,269,735 470,497 4,740,232 Commercial Banking: Commercial real estate loans 2,383,303 279,640 2,662,943 2,303,179 296,161 2,599,340 Commercial loans 626,821 60,498 687,319 572,341 60,822 633,163 Total Commercial Banking 3,010,124 340,138 3,350,262 2,875,520 356,983 3,232,503 Total loans receivable, gross 7,295,363 780,888 8,076,251 7,145,255 827,480 7,972,735 Deferred loan costs 27,291 1,293 28,584 26,255 1,527 27,782 Allowance for loan losses (49,123 ) (6,088 ) (55,211 ) (50,572 ) (6,223 ) (56,795 ) Undisbursed loan proceeds: Residential mortgage loans (8,026 ) — (8,026 ) (10,067 ) — (10,067 ) Commercial real estate loans (148,059 ) (2,627 ) (150,686 ) (141,967 ) (2,647 ) (144,614 ) Commercial loans (62,572 ) (1,284 ) (63,856 ) (51,143 ) (1,284 ) (52,427 ) Total loans receivable, net $ 7,054,874 772,182 7,827,056 6,917,761 818,853 7,736,614 (1) Includes $0 and $3.1 million of loans held for sale at March 31, 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): March 31, December 31, Acquired loans evaluated individually for future credit losses: Outstanding principal balance $ 9,453 9,735 Carrying value 6,720 6,875 Acquired loans evaluated collectively for future credit losses: Outstanding principal balance 776,923 824,205 Carrying value 771,550 818,201 Total acquired loans: Outstanding principal balance 786,376 833,940 Carrying value 778,270 825,076 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 (185 ) Net reclassification from nonaccretable yield — Balance at March 31, 2018 $ 1,355 The following table provides information related to acquired impaired loans by portfolio segment and by class of financing receivable at and for the three months ended March 31, 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 $ 1,167 1,858 18 1,175 39 Home equity loans 1,104 2,123 20 1,124 36 Consumer loans 44 125 4 51 16 Total Personal Banking 2,315 4,106 42 2,350 91 Commercial Banking: Commercial real estate loans 4,327 5,262 39 4,358 89 Commercial loans 78 85 — 90 5 Total Commercial Banking 4,405 5,347 39 4,448 94 Total $ 6,720 9,453 81 6,798 185 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 March 31, 2018 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 3,724 31 (196 ) 65 3,824 Home equity loans 3,717 (85 ) (301 ) 31 4,072 Consumer finance loans 3,031 338 (1,553 ) 278 3,968 Consumer loans 9,140 3,279 (3,177 ) 563 8,475 Total Personal Banking 19,612 3,563 (5,227 ) 937 20,339 Commercial Banking: Commercial real estate loans 20,218 703 (540 ) 144 19,911 Commercial loans 9,293 (340 ) (828 ) 139 10,322 Total Commercial Banking 29,511 363 (1,368 ) 283 30,233 Total originated loans 49,123 3,926 (6,595 ) 1,220 50,572 Acquired loans: Personal Banking: Residential mortgage loans 89 (43 ) (5 ) 6 131 Home equity loans 728 202 (310 ) 74 762 Consumer loans 807 (54 ) (72 ) 43 890 Total Personal Banking 1,624 105 (387 ) 123 1,783 Commercial Banking: Commercial real estate loans 3,430 (130 ) (11 ) 22 3,549 Commercial loans 1,034 308 (197 ) 32 891 Total Commercial Banking 4,464 178 (208 ) 54 4,440 Total acquired loans 6,088 283 (595 ) 177 6,223 Total $ 55,211 4,209 (7,190 ) 1,397 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 quarter ended March 31, 2017 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 4,638 (33 ) (153 ) 168 4,656 Home equity loans 2,989 (406 ) (176 ) 85 3,486 Consumer finance loans 3,957 1,202 (796 ) 106 3,445 Consumer loans 6,472 4,147 (2,456 ) 252 4,529 Total Personal Banking 18,056 4,910 (3,581 ) 611 16,116 Commercial Banking: Commercial real estate loans 20,635 (2,948 ) (263 ) 179 23,667 Commercial loans 15,399 409 (946 ) 426 15,510 Total Commercial Banking 36,034 (2,539 ) (1,209 ) 605 39,177 Total originated loans 54,090 2,371 (4,790 ) 1,216 55,293 Acquired loans: Personal Banking: Residential mortgage loans 78 115 (137 ) 29 71 Home equity loans 932 180 (473 ) 178 1,047 Consumer loans 831 403 (408 ) 183 653 Total Personal Banking 1,841 698 (1,018 ) 390 1,771 Commercial Banking: Commercial real estate loans 3,713 666 (211 ) 250 3,008 Commercial loans 1,460 902 (321 ) 12 867 Total Commercial Banking 5,173 1,568 (532 ) 262 3,875 Total acquired loans 7,014 2,266 (1,550 ) 652 5,646 Total $ 61,104 4,637 (6,340 ) 1,868 60,939 The following table provides information related to the loan portfolio by portfolio segment and by class of financing receivable at March 31, 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 $ 2,772,148 3,813 12,828 — 7,756 762 — Home equity loans 1,288,361 4,445 7,673 89 1,824 467 5 Consumer finance loans 12,453 3,031 3 — — — — Consumer loans 673,585 9,947 3,557 121 — — — Total Personal Banking 4,746,547 21,236 24,061 210 9,580 1,229 5 Commercial Banking: Commercial real estate loans 2,512,257 23,648 28,874 — 16,285 977 328 Commercial loans 623,463 10,327 5,745 — 5,101 367 38 Total Commercial Banking 3,135,720 33,975 34,619 — 21,386 1,344 366 Total $ 7,882,267 55,211 58,680 210 30,966 2,573 371 (1) Includes $11.2 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 three months ended March 31, 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 $ 10,660 2,168 505 6,398 19,731 19,912 236 Home equity loans 6,707 966 — 1,560 9,233 9,873 127 Consumer finance loan 3 — — — 3 41 2 Consumer loans 2,931 626 — — 3,557 4,161 55 Total Personal Banking 20,301 3,760 505 7,958 32,524 33,987 420 Commercial Banking: Commercial real estate loans 16,145 12,729 4,398 4,035 37,307 36,467 379 Commercial loans 3,144 2,601 720 2,361 8,826 9,595 115 Total Commercial Banking 19,289 15,330 5,118 6,396 46,133 46,062 494 Total $ 39,590 19,090 5,623 14,354 78,657 80,049 914 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 March 31, 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 March 31, 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 $ 2,763,824 8,324 8,324 780 — Home equity loans 1,286,538 1,823 1,823 458 — Consumer finance loans 12,453 — — — — Consumer loans 673,525 60 60 16 — Total Personal Banking 4,736,340 10,207 10,207 1,254 — Commercial Banking: Commercial real estate loans 2,490,757 21,500 16,786 1,668 4,714 Commercial loans 616,142 7,321 5,136 456 2,185 Total Commercial Banking 3,106,899 28,821 21,922 2,124 6,899 Total $ 7,843,239 39,028 32,129 3,378 6,899 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 six 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, using 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 March 31, 2018 2017 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 205 $ 32,104 225 $ 42,926 New TDRs 9 4,935 6 3,790 Re-modified TDRs — — — — Net paydowns (947 ) (1,222 ) Charge-offs: Residential mortgage loans 1 (135 ) — — Home equity loans — — — — Commercial real estate loans 1 (203 ) — — Commercial loans 1 (721 ) 1 (101 ) Paid-off loans: Residential mortgage loans 1 (249 ) — — Home equity loans 1 (12 ) 1 — Commercial real estate loans 4 (1,574 ) 2 (65 ) Commercial loans 5 (2,232 ) 3 (1,750 ) Ending TDR balance: 200 $ 30,966 224 $ 43,578 Accruing TDRs $ 19,749 $ 25,305 Non-accrual TDRs 11,217 18,273 The following table provides 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 Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Troubled debt restructurings: Personal Banking: Residential mortgage loans 2 $ 214 213 21 Home equity loans 3 140 139 36 Total Personal Banking 5 354 352 57 Commercial Banking: Commercial real estate loans 1 2,401 2,385 — Commercial loans 3 2,180 1,431 — Total Commercial Banking 4 4,581 3,816 — Total 9 $ 4,935 4,168 57 During the quarter ended March 31, 2018 , no TDRs modified within the previous twelve months have subsequently defaulted. The following table provides 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 Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Troubled debt restructurings: Personal Banking: Residential mortgage loans 2 $ 448 447 48 Home equity loans — — — — Total Personal Banking 2 448 447 48 Commercial Banking: Commercial real estate loans 3 3,138 3,119 225 Commercial loans 1 204 199 14 Total Commercial Banking 4 3,342 3,318 239 Total 6 $ 3,790 3,765 287 During the quarter ended March 31, 2017 , no TDRs modified within the previous twelve months have subsequently defaulted. The following table provides information as of March 31, 2018 for troubled debt restructuring (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended March 31, 2018 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 2 $ — — 178 35 213 Home equity loans 3 30 — — 109 139 Total Personal Banking 5 30 — 178 144 352 Commercial Banking: Commercial real estate loans 1 — — — 2,385 2,385 Commercial loans 3 — — — 1,431 1,431 Total Commercial Banking 4 — — — 3,816 3,816 Total 9 $ 30 — 178 3,960 4,168 The following table provides information as of March 31, 2017 for troubled debt restructuring (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended March 31, 2017 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 2 $ 112 — — 335 447 Home equity loans — — — — — — Total Personal Banking 2 112 — — 335 447 Commercial Banking: Commercial real estate loans 3 — 2,755 364 — 3,119 Commercial loans 1 — — 199 — 199 Total Commercial Banking 4 — 2,755 563 — 3,318 Total 6 $ 112 2,755 563 335 3,765 During the quarters ended March 31, 2018 and 2017, no TDRs were re-modified. The following table provides information related to loan payment delinquencies at March 31, 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 $ 26,001 811 10,237 37,049 2,626,529 2,663,578 — Home equity loans 5,850 1,664 5,621 13,135 1,027,193 1,040,328 — Consumer finance loans 1,288 233 3 1,524 10,929 12,453 — Consumer loans 7,477 2,122 2,487 12,086 576,059 588,145 — Total Personal Banking 40,616 4,830 18,348 63,794 4,240,710 4,304,504 — Commercial Banking: Commercial real estate loans 18,030 1,536 11,957 31,523 2,203,721 2,235,244 — Commercial loans 2,541 92 2,826 5,459 558,790 564,249 — Total Commercial Banking 20,571 1,628 14,783 36,982 2,762,511 2,799,493 — Total originated loans 61,187 6,458 33,131 100,776 7,003,221 7,103,997 — Acquired loans: Personal Banking: Residential mortgage loans 1,402 1,132 554 3,088 105,482 108,570 131 Home equity loans 1,556 376 1,129 3,061 244,972 248,033 43 Consumer loans 775 137 452 1,364 84,076 85,440 8 Total Personal Banking 3,733 1,645 2,135 7,513 434,530 442,043 182 Commercial Banking: Commercial real estate loans 2,273 273 4,766 7,312 269,701 277,013 578 Commercial loans 371 104 318 793 58,421 59,214 — Total Commercial Banking 2,644 377 5,084 8,105 328,122 336,227 578 Total acquired loans 6,377 2,022 7,219 15,618 762,652 778,270 760 Total loans $ 67,564 8,480 40,350 116,394 7,765,873 7,882,267 760 (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 March 31, 2018 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans: Personal Banking: Residential mortgage loans $ 2,646,948 — 16,630 — — 2,663,578 Home equity loans 1,032,575 — 7,753 — — 1,040,328 Consumer finance loans 12,450 — 3 — — 12,453 Consumer loans 585,080 — 3,065 — — 588,145 Total Personal Banking 4,277,053 — 27,451 — — 4,304,504 Commercial Banking: Commercial real estate loans 2,018,908 53,377 162,959 — — 2,235,244 Commercial loans 509,145 15,582 39,522 — — 564,249 Total Commercial Banking 2,528,053 68,959 202,481 — — 2,799,493 Total originated loans 6,805,106 68,959 229,932 — — 7,103,997 Acquired loans: Personal Banking: Residential mortgage loans 108,130 — 440 — — 108,570 Home equity loans 246,562 — 1,471 — — 248,033 Consumer loans 84,903 — 537 — — 85,440 Total Personal Banking 439,595 — 2,448 — — 442,043 Commercial Banking: Commercial real estate loans 237,146 4,313 35,554 — — 277,013 Commercial loans 48,468 3,565 7,181 — — 59,214 Total Commercial Banking 285,614 7,878 42,735 — — 336,227 Total acquired loans 725,209 7,878 45,183 — — 778,270 Total loans $ 7,530,315 76,837 275,115 — — 7,882,267 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 A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 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): March 31, December 31, Amortizable intangible assets: Core deposit intangibles — gross $ 63,685 63,685 Less: accumulated amortization (41,333 ) (40,029 ) Core deposit intangibles — net 22,352 23,656 Customer and Contract intangible assets — gross 10,474 10,474 Less: accumulated amortization (8,677 ) (8,461 ) Customer and Contract intangible assets — net $ 1,797 2,013 The following table shows the actual aggregate amortization expense for the quarters ended March 31, 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 March 31, 2018 $ 1,520 For the quarter ended March 31, 2017 1,749 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 March 31, 2018 $ 307,420 We performed our annual goodwill impairment test as of June 30, 2017 using ASU 2011-08, Intangibles-Goodwill and Other (Topic 350): Testing Goodwill for Impairment ("Step 0") and concluded that goodwill was not impaired. At March 31, 2018, there were no factors that would cause us to update that test.

Borrowed Funds

Borrowed Funds	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Borrowed Funds	Borrowed Funds Borrowings Borrowings from the FHLB of Pittsburgh, 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 of Pittsburgh carries a commitment of $150.0 million . The rate is adjusted daily by the FHLB of Pittsburgh, and any borrowings on this line may be repaid at any time without penalty. At March 31, 2018 and December 31, 2017 the revolving line of credit was undrawn. At March 31, 2018 and December 31, 2017 collateralized borrowings, due within one year, were $104.6 million , and $108.2 million , respectively. These borrowings are collateralized by various securities held in safekeeping by the FHLB of Pittsburgh. 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 trusts (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 had 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 March 31, 2018 was 3.69% . 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 March 31, 2018 was 3.50% . 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 March 31, 2018 was 3.60% . 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(s).

Guarantees

Guarantees	3 Months Ended
	Mar. 31, 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 March 31, 2018 , the maximum potential amount of future payments we could be required to make under these non-recourse standby letters of credit was $23.8 million , of which $15.1 million is fully collateralized. At March 31, 2018 , we had a liability, which represents deferred income, of $152,000 related to the standby letters of credit.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 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 March 31, 2018 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 $16.83 . All stock options outstanding during the quarter ended March 31, 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 $17.54 . The computation of basic and diluted earnings per share follows (in thousands, except share data and per share amounts): Quarter ended 2018 2017 Reported net income $ 24,985 17,746 Weighted average common shares outstanding 101,598,928 100,653,277 Dilutive potential shares due to effect of stock options 1,537,569 1,827,272 Total weighted average common shares and dilutive potential shares 103,136,497 102,480,549 Basic earnings per share: $ 0.25 0.18 Diluted earnings per share: $ 0.24 0.17

Pension and Other Post-retireme

Pension and Other Post-retirement Benefits	3 Months Ended
	Mar. 31, 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 March 31, Pension benefits Other post-retirement benefits 2018 2017 2018 2017 Service cost $ 1,716 1,537 — — Interest cost 1,678 1,737 14 18 Expected return on plan assets (2,992 ) (2,628 ) — — Amortization of prior service cost (581 ) (581 ) — — Amortization of the net loss 873 928 24 27 Net periodic cost $ 694 993 38 45 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	3 Months Ended
	Mar. 31, 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. Certain debt securities which were AAA rated at purchase do not have an active market and as such we have used an alternative method to determine the fair value of these securities. The fair value has been determined using a discounted cash flow model using market assumptions, which generally include cash flow, collateral and other market assumptions. As such, securities which otherwise would have been classified as level 2 securities if an active market for those assets or similar assets existed are included herein as level 3 assets. Other debt securities, pooled trust preferred securities rated below AA at purchase, have a fair value based on a discounted cash flow model using similar assumptions to those noted above and accordingly are classified as level 3 assets. Equity securities - available for sale - Level 1 securities include publicly traded securities valued using quoted market prices. 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 the transferability of FHLB stock it is not practical to determine the fair value. 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 March 31, 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 March 31, 2018 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 192,158 192,158 192,158 — — Securities available-for-sale 757,976 757,976 — 757,976 — Securities held-to-maturity 27,709 27,324 — 27,324 — Loans receivable, net 7,827,056 7,677,596 — — 7,677,596 Accrued interest receivable 23,051 23,051 23,051 — — Interest rate swaps 2,971 2,971 — 2,971 — FHLB Stock 7,694 7,694 — — — Total financial assets $ 8,838,615 8,688,770 215,209 788,271 7,677,596 Financial liabilities: Savings and checking deposits $ 6,564,889 6,564,889 6,564,889 — — Time deposits 1,420,600 1,444,841 — — 1,444,841 Borrowed funds 104,558 104,558 104,558 — — Junior subordinated debentures 111,213 111,670 — — 111,670 Foreign exchange swaps 13 13 — 13 — Interest rate swaps 3,580 3,580 — 3,580 — Accrued interest payable 528 528 528 — — Total financial liabilities $ 8,205,381 8,230,079 6,669,975 3,593 1,556,511 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 — — — Total financial assets $ 8,671,836 8,697,773 104,764 821,842 7,759,434 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 March 31, 2018 and December 31, 2017 . There were no transfers of financial instruments between Level 1 and Level 2 during the quarter ended March 31, 2018 . The following table represents assets and liabilities measured at fair value on a recurring basis at March 31, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Equity securities $ — — — — Debt securities: U.S. government and agencies — 1 — 1 Government sponsored enterprises — 202,295 — 202,295 States and political subdivisions — 41,101 — 41,101 Corporate — — Total debt securities — 243,397 — 243,397 Residential mortgage-backed securities: GNMA — 30,605 — 30,605 FNMA — 78,733 — 78,733 FHLMC — 61,342 — 61,342 Non-agency — 548 — 548 Collateralized mortgage obligations: GNMA — 4,548 — 4,548 FNMA — 180,538 — 180,538 FHLMC — 157,354 — 157,354 Non-agency — 1 — 1 Total mortgage-backed securities — 513,669 — 513,669 Interest rate swaps — 2,971 — 2,971 Total Assets $ — 760,037 — 760,037 Interest rate swaps $ — 3,580 — 3,580 Foreign exchange swaps — 13 — 13 Total Liabilities $ — 3,593 — 3,593 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 March 31, March 31, Beginning balance January 1, $ — 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 — 511 Purchases — — Sales — — Transfers in to Level 3 — — Transfers out of Level 3 — — Ending balance March 31, $ — 9,877 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 March 31, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 28,751 28,751 Real estate owned — — 4,041 4,041 Total assets $ — — 32,792 32,792 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 March 31, 2018 (dollar amounts in thousands): Fair value Valuation techniques Significant unobservable inputs Range (weighted average) Loans measured for impairment 28,751 Appraisal value (1) Estimated cost to sell 10.0% Discounted cash flow Discount rate 4.25% to 10.0% (7.50%) Real estate owned 4,041 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	3 Months Ended
	Mar. 31, 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 two interest rate swap agreements (swaps), designating the swaps as cash flow hedges. The swaps are intended to protect against the variability of cash flows associated with Northwest Bancorp Capital Trust III and Northwest Bancorp Capital Trust IV. The first swap modifies the re-pricing characteristics of Northwest Bancorp Capital Trust III, wherein for a 10 years period expiring in September 2018, the Company receives interest of three-month LIBOR from a counterparty and pays a fixed rate of 4.61% to the same counterparty calculated on a notional amount of $ 25.0 million . The second swap modifies the re-pricing characteristics of Northwest Bancorp Trust IV, wherein for a ten years period 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 agreements were entered into with a counterparty that met our credit standards and the agreements contain collateral provisions protecting the at-risk party. We believe that the credit risk inherent in the contracts is not significant. At March 31, 2018 , $ 1.1 million of cash was pledged as collateral to the counterparty. These cash flow hedges are recorded within other liabilities on the consolidated statement of financial condition at their estimated fair value. At March 31, 2018 , the fair value of the swap agreements was $609,000 . There was no material hedge ineffectiveness for any of the swaps 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 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 March 31, 2018 Derivatives designed as hedging instruments: Interest rate swap agreements $ — — 50,000 609 Derivatives not designed as hedging instruments: Interest rate swap agreements 125,394 2,971 125,394 2,971 Foreign exchange swap agreements — — 5,558 13 Total derivatives $ 125,394 2,971 180,952 3,593 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 March 31, 2018 2017 Non-hedging swap derivatives: Increase/ (decrease) in other income $ 129 (34 ) Hedging interest rate derivatives: Increase in interest expense 332 419

Legal Proceedings

Legal Proceedings	3 Months Ended
	Mar. 31, 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 March 31, 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)	3 Months Ended
	Mar. 31, 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 March 31, 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 before reclassification adjustments (3,955 ) 360 — (3,595 ) Amounts reclassified from accumulated other comprehensive income (1), (2) (26 ) — 226 200 Net other comprehensive income (4,972 ) 211 (5,380 ) (10,141 ) Balance as of March 31, 2018 $ (9,381 ) (480 ) (32,360 ) (42,221 ) For the quarter ended March 31, 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 658 303 — 961 Amounts reclassified from accumulated other comprehensive income (3), (4) (11 ) — 220 209 Net other comprehensive income 647 303 220 1,170 Balance as of March 31, 2017 $ 1,042 (1,475 ) (26,388 ) (26,821 ) (1) Consists of realized gain on securities (gain on sales of investments, net) of $33 , net of tax (income tax expense) of $(7) . (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 loss on securities (gain on sales of investments, net) of $19 , net of tax (income tax expense) of $(8) . (4) Consists of amortization of prior service cost (compensation and employee benefits) of $581 and amortization of net loss (compensation and employee benefits) of $(954) , net of tax (income tax expense) of $153 .

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Revenue Recognition	Revenue Recognition 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 customer 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. All revenue from contracts with customers in the scope of ASC 606 is recognized within noninterest income. The following table presents sources of non-interest income for the periods indicated. Items outside the scope of ASC 606 are noted as such. For the quarter ended March 31, 2018 2017 Service charges on deposits $ 4,920 5,197 Loan servicing fees (1) 565 411 Interchange income 6,414 6,109 Total service charges and fees 11,899 11,717 Gain/(loss) on the sale of investments (1) 153 17 Trust and other financial services income 4,031 4,304 Insurance commission income 2,749 2,794 Loss on real estate owned, net (546 ) (67 ) Income from bank owned life insurance (1) 990 1,068 Mortgage banking income (1) 224 240 Other operating income (2) 2,288 1,431 Total non-interest income $ 21,788 21,504 (1) Not within the scope of ASC 606. (2) Other operating income includes of $621 and $212 for the periods ended March 31, 2018 and March 31, 2017 , respectively, which was explicitly excluded from the scope of ASU 2014-09. Service Charges and Fees. 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 cardholders 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. Trust and Other Financial Services Income. 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. Insurance Commission Income. 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 customer. Loss on Real Estate Owned, Net. Loss on real estate owned represents gain 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 transfer 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 to which we expect, the transaction would not be accounted for as a sale until the concerns about collectability are resolved. Other operating Income. 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.

Basis of Presentation and Inf24

Basis of Presentation and Informational Disclosures (Policies)	3 Months Ended
	Mar. 31, 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 March 31, 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 , 2015 and 2014.
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) ”. On January 1, 2018, we adopted ASC 606, Revenue from Contracts with Customers 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 customer 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 cardholders 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 customer. Loss on real estate owned represents gain 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 transfer 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 to which we expect, 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 on January 1, 2018 and are required to apply it on a retrospective basis. No reclassifications were made for the quarter 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, the amendments were applied on a prospective basis and the adoption did not have a significant impact on the consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business”. This guidance provides a more robust framework to use in determining when a set of assets and activities (“set”) is a business and to address stakeholder feedback that the definition of a business in current GAAP is applied too broadly. The primary amendments in the ASU provide a screen to exclude transactions where substantially all of the fair value of the transferred set is concentrated in a single asset, or group of similar assets, from being evaluated as a business. We adopted this standard on January 1, 2018 and will apply the guidance to future transactions. 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 ended March 31, 2017 totaled $517,000 and were reclassified from compensation and employee benefits to other expense. In March 2017 the FASB issued ASU 2017-08, "Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities". This guidance shortens the amortization period for certain callable debt securities held at a premium to the earliest call date from the maturity date. This guidance is effective for annual and interim periods beginning after December 15, 2018. Early adoption is permitted in any interim period. We have elected to early adopt this standard as of January 1, 2018. The adoption did not have a material impact on our results of operations or financial position. In May 2017 the FASB issued ASU 2017-09, “Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting”. This guidance clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. Under ASU 2017-09, an entity will not apply modification accounting to a share-based payment award if all of the following are the same immediately before and after the change: (i) the award's fair value, (ii) the award's vesting conditions and (iii) the award's classification as an equity or liability instrument. This guidance is effective for annual and interim periods beginning after December 15, 2017 and should be applied on a prospective basis to an award modified on or after the adoption date. We adopted this standard as of January 1, 2018 and will apply the guidance to future modifications. 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 standard income tax effects relating to the unrealized 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 as 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-to-use assets and lease obligations under the ASU as a result of our minimum commitments under non-cancellable operating lease. Our current minimum commitments under non-cancellable operating leases are disclosed in Note 7, “Premises and Equipment” on our 2017 Annual Report on Form 10-K. 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 requiring, instead, 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 asset(s) 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, 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 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. Revenue Recognition 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 customer 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. All revenue from contracts with customers in the scope of ASC 606 is recognized within noninterest income. The following table presents sources of non-interest income for the periods indicated. Items outside the scope of ASC 606 are noted as such. For the quarter ended March 31, 2018 2017 Service charges on deposits $ 4,920 5,197 Loan servicing fees (1) 565 411 Interchange income 6,414 6,109 Total service charges and fees 11,899 11,717 Gain/(loss) on the sale of investments (1) 153 17 Trust and other financial services income 4,031 4,304 Insurance commission income 2,749 2,794 Loss on real estate owned, net (546 ) (67 ) Income from bank owned life insurance (1) 990 1,068 Mortgage banking income (1) 224 240 Other operating income (2) 2,288 1,431 Total non-interest income $ 21,788 21,504 (1) Not within the scope of ASC 606. (2) Other operating income includes of $621 and $212 for the periods ended March 31, 2018 and March 31, 2017 , respectively, which was explicitly excluded from the scope of ASU 2014-09. Service Charges and Fees. 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 cardholders 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. Trust and Other Financial Services Income. 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. Insurance Commission Income. 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 customer. Loss on Real Estate Owned, Net. Loss on real estate owned represents gain 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 transfer 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 to which we expect, the transaction would not be accounted for as a sale until the concerns about collectability are resolved. Other operating Income. 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.

Investment securities and imp25

Investment securities and impairment of investment securities (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 in one year or less $ 1 — — 1 Debt issued by government sponsored enterprises: Due in one year or less 66,007 1 (241 ) 65,767 Due after one year through five years 135,355 — (3,139 ) 132,216 Due after ten years 4,381 — (69 ) 4,312 Municipal securities: Due in one year or less 2,487 10 — 2,497 Due after one year through five years 5,115 59 (10 ) 5,164 Due after five years through ten years 15,168 95 (15 ) 15,248 Due after ten years 18,085 113 (6 ) 18,192 Corporate debt issues: Due after ten years 910 — — 910 Residential mortgage-backed securities: Fixed rate pass-through 142,425 843 (4,605 ) 138,663 Variable rate pass-through 31,270 1,301 (6 ) 32,565 Fixed rate non-agency CMOs 1 — — 1 Fixed rate agency CMOs 278,288 21 (7,833 ) 270,476 Variable rate agency CMOs 71,617 381 (34 ) 71,964 Total residential mortgage-backed securities 523,601 2,546 (12,478 ) 513,669 Total marketable securities available-for-sale $ 771,110 2,824 (15,958 ) 757,976 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 March 31, 2018 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through 3,489 98 — 3,587 Variable rate pass-through 2,185 58 — 2,243 Fixed rate agency CMOs 21,363 4 (556 ) 20,811 Variable rate agency CMOs 672 11 — 683 Total residential mortgage-backed securities 27,709 171 (556 ) 27,324 Total marketable securities held-to-maturity $ 27,709 171 (556 ) 27,324 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 March 31, 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 $ 4,982 (29 ) 191,381 (3,420 ) 196,363 (3,449 ) Municipal securities 7,127 (31 ) — — 7,127 (31 ) Residential mortgage-backed securities - agency 250,025 (5,178 ) 190,659 (7,856 ) 440,684 (13,034 ) Total temporarily impaired securities $ 262,134 (5,238 ) 382,040 (11,276 ) 644,174 (16,514 ) 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 ended March 31 : 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 securities sold/ called realized during the quarter (352 ) — Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized — — Ending balance at March 31, $ — 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)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Summary of loans receivable	The following table shows a summary of our loans receivable at March 31, 2018 and December 31, 2017 (in thousands): March 31, 2018 December 31, Originated Acquired Total Originated Acquired Total Personal Banking: Residential mortgage loans (1) $ 2,658,404 108,570 2,766,974 2,658,726 113,823 2,772,549 Home equity loans 1,040,328 248,033 1,288,361 1,051,558 258,797 1,310,355 Consumer finance loans (2) 12,453 — 12,453 18,619 — 18,619 Consumer loans 574,054 84,147 658,201 540,832 97,877 638,709 Total Personal Banking 4,285,239 440,750 4,725,989 4,269,735 470,497 4,740,232 Commercial Banking: Commercial real estate loans 2,383,303 279,640 2,662,943 2,303,179 296,161 2,599,340 Commercial loans 626,821 60,498 687,319 572,341 60,822 633,163 Total Commercial Banking 3,010,124 340,138 3,350,262 2,875,520 356,983 3,232,503 Total loans receivable, gross 7,295,363 780,888 8,076,251 7,145,255 827,480 7,972,735 Deferred loan costs 27,291 1,293 28,584 26,255 1,527 27,782 Allowance for loan losses (49,123 ) (6,088 ) (55,211 ) (50,572 ) (6,223 ) (56,795 ) Undisbursed loan proceeds: Residential mortgage loans (8,026 ) — (8,026 ) (10,067 ) — (10,067 ) Commercial real estate loans (148,059 ) (2,627 ) (150,686 ) (141,967 ) (2,647 ) (144,614 ) Commercial loans (62,572 ) (1,284 ) (63,856 ) (51,143 ) (1,284 ) (52,427 ) Total loans receivable, net $ 7,054,874 772,182 7,827,056 6,917,761 818,853 7,736,614 (1) Includes $0 and $3.1 million of loans held for sale at March 31, 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): March 31, December 31, Acquired loans evaluated individually for future credit losses: Outstanding principal balance $ 9,453 9,735 Carrying value 6,720 6,875 Acquired loans evaluated collectively for future credit losses: Outstanding principal balance 776,923 824,205 Carrying value 771,550 818,201 Total acquired loans: Outstanding principal balance 786,376 833,940 Carrying value 778,270 825,076
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 (185 ) Net reclassification from nonaccretable yield — Balance at March 31, 2018 $ 1,355
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 three months ended March 31, 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 $ 10,660 2,168 505 6,398 19,731 19,912 236 Home equity loans 6,707 966 — 1,560 9,233 9,873 127 Consumer finance loan 3 — — — 3 41 2 Consumer loans 2,931 626 — — 3,557 4,161 55 Total Personal Banking 20,301 3,760 505 7,958 32,524 33,987 420 Commercial Banking: Commercial real estate loans 16,145 12,729 4,398 4,035 37,307 36,467 379 Commercial loans 3,144 2,601 720 2,361 8,826 9,595 115 Total Commercial Banking 19,289 15,330 5,118 6,396 46,133 46,062 494 Total $ 39,590 19,090 5,623 14,354 78,657 80,049 914 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 three months ended March 31, 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 $ 1,167 1,858 18 1,175 39 Home equity loans 1,104 2,123 20 1,124 36 Consumer loans 44 125 4 51 16 Total Personal Banking 2,315 4,106 42 2,350 91 Commercial Banking: Commercial real estate loans 4,327 5,262 39 4,358 89 Commercial loans 78 85 — 90 5 Total Commercial Banking 4,405 5,347 39 4,448 94 Total $ 6,720 9,453 81 6,798 185 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 quarter ended March 31, 2018 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 3,724 31 (196 ) 65 3,824 Home equity loans 3,717 (85 ) (301 ) 31 4,072 Consumer finance loans 3,031 338 (1,553 ) 278 3,968 Consumer loans 9,140 3,279 (3,177 ) 563 8,475 Total Personal Banking 19,612 3,563 (5,227 ) 937 20,339 Commercial Banking: Commercial real estate loans 20,218 703 (540 ) 144 19,911 Commercial loans 9,293 (340 ) (828 ) 139 10,322 Total Commercial Banking 29,511 363 (1,368 ) 283 30,233 Total originated loans 49,123 3,926 (6,595 ) 1,220 50,572 Acquired loans: Personal Banking: Residential mortgage loans 89 (43 ) (5 ) 6 131 Home equity loans 728 202 (310 ) 74 762 Consumer loans 807 (54 ) (72 ) 43 890 Total Personal Banking 1,624 105 (387 ) 123 1,783 Commercial Banking: Commercial real estate loans 3,430 (130 ) (11 ) 22 3,549 Commercial loans 1,034 308 (197 ) 32 891 Total Commercial Banking 4,464 178 (208 ) 54 4,440 Total acquired loans 6,088 283 (595 ) 177 6,223 Total $ 55,211 4,209 (7,190 ) 1,397 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 quarter ended March 31, 2017 (in thousands): Balance Current period provision Charge-offs Recoveries Balance Originated loans: Personal Banking: Residential mortgage loans $ 4,638 (33 ) (153 ) 168 4,656 Home equity loans 2,989 (406 ) (176 ) 85 3,486 Consumer finance loans 3,957 1,202 (796 ) 106 3,445 Consumer loans 6,472 4,147 (2,456 ) 252 4,529 Total Personal Banking 18,056 4,910 (3,581 ) 611 16,116 Commercial Banking: Commercial real estate loans 20,635 (2,948 ) (263 ) 179 23,667 Commercial loans 15,399 409 (946 ) 426 15,510 Total Commercial Banking 36,034 (2,539 ) (1,209 ) 605 39,177 Total originated loans 54,090 2,371 (4,790 ) 1,216 55,293 Acquired loans: Personal Banking: Residential mortgage loans 78 115 (137 ) 29 71 Home equity loans 932 180 (473 ) 178 1,047 Consumer loans 831 403 (408 ) 183 653 Total Personal Banking 1,841 698 (1,018 ) 390 1,771 Commercial Banking: Commercial real estate loans 3,713 666 (211 ) 250 3,008 Commercial loans 1,460 902 (321 ) 12 867 Total Commercial Banking 5,173 1,568 (532 ) 262 3,875 Total acquired loans 7,014 2,266 (1,550 ) 652 5,646 Total $ 61,104 4,637 (6,340 ) 1,868 60,939
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 March 31, 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 $ 2,772,148 3,813 12,828 — 7,756 762 — Home equity loans 1,288,361 4,445 7,673 89 1,824 467 5 Consumer finance loans 12,453 3,031 3 — — — — Consumer loans 673,585 9,947 3,557 121 — — — Total Personal Banking 4,746,547 21,236 24,061 210 9,580 1,229 5 Commercial Banking: Commercial real estate loans 2,512,257 23,648 28,874 — 16,285 977 328 Commercial loans 623,463 10,327 5,745 — 5,101 367 38 Total Commercial Banking 3,135,720 33,975 34,619 — 21,386 1,344 366 Total $ 7,882,267 55,211 58,680 210 30,966 2,573 371 (1) Includes $11.2 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 March 31, 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 $ 2,763,824 8,324 8,324 780 — Home equity loans 1,286,538 1,823 1,823 458 — Consumer finance loans 12,453 — — — — Consumer loans 673,525 60 60 16 — Total Personal Banking 4,736,340 10,207 10,207 1,254 — Commercial Banking: Commercial real estate loans 2,490,757 21,500 16,786 1,668 4,714 Commercial loans 616,142 7,321 5,136 456 2,185 Total Commercial Banking 3,106,899 28,821 21,922 2,124 6,899 Total $ 7,843,239 39,028 32,129 3,378 6,899 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 March 31, 2018 2017 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 205 $ 32,104 225 $ 42,926 New TDRs 9 4,935 6 3,790 Re-modified TDRs — — — — Net paydowns (947 ) (1,222 ) Charge-offs: Residential mortgage loans 1 (135 ) — — Home equity loans — — — — Commercial real estate loans 1 (203 ) — — Commercial loans 1 (721 ) 1 (101 ) Paid-off loans: Residential mortgage loans 1 (249 ) — — Home equity loans 1 (12 ) 1 — Commercial real estate loans 4 (1,574 ) 2 (65 ) Commercial loans 5 (2,232 ) 3 (1,750 ) Ending TDR balance: 200 $ 30,966 224 $ 43,578 Accruing TDRs $ 19,749 $ 25,305 Non-accrual TDRs 11,217 18,273
Schedule of troubled debt restructurings (including re-modified TDRs) by portfolio segment and by class of financing receivable	The following table provides 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 Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Troubled debt restructurings: Personal Banking: Residential mortgage loans 2 $ 448 447 48 Home equity loans — — — — Total Personal Banking 2 448 447 48 Commercial Banking: Commercial real estate loans 3 3,138 3,119 225 Commercial loans 1 204 199 14 Total Commercial Banking 4 3,342 3,318 239 Total 6 $ 3,790 3,765 287
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 March 31, 2018 for troubled debt restructuring (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended March 31, 2018 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 2 $ — — 178 35 213 Home equity loans 3 30 — — 109 139 Total Personal Banking 5 30 — 178 144 352 Commercial Banking: Commercial real estate loans 1 — — — 2,385 2,385 Commercial loans 3 — — — 1,431 1,431 Total Commercial Banking 4 — — — 3,816 3,816 Total 9 $ 30 — 178 3,960 4,168 The following table provides information as of March 31, 2017 for troubled debt restructuring (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended March 31, 2017 (dollars in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 2 $ 112 — — 335 447 Home equity loans — — — — — — Total Personal Banking 2 112 — — 335 447 Commercial Banking: Commercial real estate loans 3 — 2,755 364 — 3,119 Commercial loans 1 — — 199 — 199 Total Commercial Banking 4 — 2,755 563 — 3,318 Total 6 $ 112 2,755 563 335 3,765
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 March 31, 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 $ 26,001 811 10,237 37,049 2,626,529 2,663,578 — Home equity loans 5,850 1,664 5,621 13,135 1,027,193 1,040,328 — Consumer finance loans 1,288 233 3 1,524 10,929 12,453 — Consumer loans 7,477 2,122 2,487 12,086 576,059 588,145 — Total Personal Banking 40,616 4,830 18,348 63,794 4,240,710 4,304,504 — Commercial Banking: Commercial real estate loans 18,030 1,536 11,957 31,523 2,203,721 2,235,244 — Commercial loans 2,541 92 2,826 5,459 558,790 564,249 — Total Commercial Banking 20,571 1,628 14,783 36,982 2,762,511 2,799,493 — Total originated loans 61,187 6,458 33,131 100,776 7,003,221 7,103,997 — Acquired loans: Personal Banking: Residential mortgage loans 1,402 1,132 554 3,088 105,482 108,570 131 Home equity loans 1,556 376 1,129 3,061 244,972 248,033 43 Consumer loans 775 137 452 1,364 84,076 85,440 8 Total Personal Banking 3,733 1,645 2,135 7,513 434,530 442,043 182 Commercial Banking: Commercial real estate loans 2,273 273 4,766 7,312 269,701 277,013 578 Commercial loans 371 104 318 793 58,421 59,214 — Total Commercial Banking 2,644 377 5,084 8,105 328,122 336,227 578 Total acquired loans 6,377 2,022 7,219 15,618 762,652 778,270 760 Total loans $ 67,564 8,480 40,350 116,394 7,765,873 7,882,267 760 (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 March 31, 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 $ 26,001 811 10,237 37,049 2,626,529 2,663,578 — Home equity loans 5,850 1,664 5,621 13,135 1,027,193 1,040,328 — Consumer finance loans 1,288 233 3 1,524 10,929 12,453 — Consumer loans 7,477 2,122 2,487 12,086 576,059 588,145 — Total Personal Banking 40,616 4,830 18,348 63,794 4,240,710 4,304,504 — Commercial Banking: Commercial real estate loans 18,030 1,536 11,957 31,523 2,203,721 2,235,244 — Commercial loans 2,541 92 2,826 5,459 558,790 564,249 — Total Commercial Banking 20,571 1,628 14,783 36,982 2,762,511 2,799,493 — Total originated loans 61,187 6,458 33,131 100,776 7,003,221 7,103,997 — Acquired loans: Personal Banking: Residential mortgage loans 1,402 1,132 554 3,088 105,482 108,570 131 Home equity loans 1,556 376 1,129 3,061 244,972 248,033 43 Consumer loans 775 137 452 1,364 84,076 85,440 8 Total Personal Banking 3,733 1,645 2,135 7,513 434,530 442,043 182 Commercial Banking: Commercial real estate loans 2,273 273 4,766 7,312 269,701 277,013 578 Commercial loans 371 104 318 793 58,421 59,214 — Total Commercial Banking 2,644 377 5,084 8,105 328,122 336,227 578 Total acquired loans 6,377 2,022 7,219 15,618 762,652 778,270 760 Total loans $ 67,564 8,480 40,350 116,394 7,765,873 7,882,267 760 (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 March 31, 2018 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans: Personal Banking: Residential mortgage loans $ 2,646,948 — 16,630 — — 2,663,578 Home equity loans 1,032,575 — 7,753 — — 1,040,328 Consumer finance loans 12,450 — 3 — — 12,453 Consumer loans 585,080 — 3,065 — — 588,145 Total Personal Banking 4,277,053 — 27,451 — — 4,304,504 Commercial Banking: Commercial real estate loans 2,018,908 53,377 162,959 — — 2,235,244 Commercial loans 509,145 15,582 39,522 — — 564,249 Total Commercial Banking 2,528,053 68,959 202,481 — — 2,799,493 Total originated loans 6,805,106 68,959 229,932 — — 7,103,997 Acquired loans: Personal Banking: Residential mortgage loans 108,130 — 440 — — 108,570 Home equity loans 246,562 — 1,471 — — 248,033 Consumer loans 84,903 — 537 — — 85,440 Total Personal Banking 439,595 — 2,448 — — 442,043 Commercial Banking: Commercial real estate loans 237,146 4,313 35,554 — — 277,013 Commercial loans 48,468 3,565 7,181 — — 59,214 Total Commercial Banking 285,614 7,878 42,735 — — 336,227 Total acquired loans 725,209 7,878 45,183 — — 778,270 Total loans $ 7,530,315 76,837 275,115 — — 7,882,267 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 Intangible27

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 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): March 31, December 31, Amortizable intangible assets: Core deposit intangibles — gross $ 63,685 63,685 Less: accumulated amortization (41,333 ) (40,029 ) Core deposit intangibles — net 22,352 23,656 Customer and Contract intangible assets — gross 10,474 10,474 Less: accumulated amortization (8,677 ) (8,461 ) Customer and Contract intangible assets — net $ 1,797 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 March 31, 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 March 31, 2018 $ 1,520 For the quarter ended March 31, 2017 1,749 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 March 31, 2018 $ 307,420

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 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 2018 2017 Reported net income $ 24,985 17,746 Weighted average common shares outstanding 101,598,928 100,653,277 Dilutive potential shares due to effect of stock options 1,537,569 1,827,272 Total weighted average common shares and dilutive potential shares 103,136,497 102,480,549 Basic earnings per share: $ 0.25 0.18 Diluted earnings per share: $ 0.24 0.17

Pension and Other Post-retire29

Pension and Other Post-retirement Benefits (Tables)	3 Months Ended
	Mar. 31, 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 March 31, Pension benefits Other post-retirement benefits 2018 2017 2018 2017 Service cost $ 1,716 1,537 — — Interest cost 1,678 1,737 14 18 Expected return on plan assets (2,992 ) (2,628 ) — — Amortization of prior service cost (581 ) (581 ) — — Amortization of the net loss 873 928 24 27 Net periodic cost $ 694 993 38 45

Disclosures About Fair Value 30

Disclosures About Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2018 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 192,158 192,158 192,158 — — Securities available-for-sale 757,976 757,976 — 757,976 — Securities held-to-maturity 27,709 27,324 — 27,324 — Loans receivable, net 7,827,056 7,677,596 — — 7,677,596 Accrued interest receivable 23,051 23,051 23,051 — — Interest rate swaps 2,971 2,971 — 2,971 — FHLB Stock 7,694 7,694 — — — Total financial assets $ 8,838,615 8,688,770 215,209 788,271 7,677,596 Financial liabilities: Savings and checking deposits $ 6,564,889 6,564,889 6,564,889 — — Time deposits 1,420,600 1,444,841 — — 1,444,841 Borrowed funds 104,558 104,558 104,558 — — Junior subordinated debentures 111,213 111,670 — — 111,670 Foreign exchange swaps 13 13 — 13 — Interest rate swaps 3,580 3,580 — 3,580 — Accrued interest payable 528 528 528 — — Total financial liabilities $ 8,205,381 8,230,079 6,669,975 3,593 1,556,511 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 — — — Total financial assets $ 8,671,836 8,697,773 104,764 821,842 7,759,434 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 March 31, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Equity securities $ — — — — Debt securities: U.S. government and agencies — 1 — 1 Government sponsored enterprises — 202,295 — 202,295 States and political subdivisions — 41,101 — 41,101 Corporate — — Total debt securities — 243,397 — 243,397 Residential mortgage-backed securities: GNMA — 30,605 — 30,605 FNMA — 78,733 — 78,733 FHLMC — 61,342 — 61,342 Non-agency — 548 — 548 Collateralized mortgage obligations: GNMA — 4,548 — 4,548 FNMA — 180,538 — 180,538 FHLMC — 157,354 — 157,354 Non-agency — 1 — 1 Total mortgage-backed securities — 513,669 — 513,669 Interest rate swaps — 2,971 — 2,971 Total Assets $ — 760,037 — 760,037 Interest rate swaps $ — 3,580 — 3,580 Foreign exchange swaps — 13 — 13 Total Liabilities $ — 3,593 — 3,593 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 March 31, March 31, Beginning balance January 1, $ — 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 — 511 Purchases — — Sales — — Transfers in to Level 3 — — Transfers out of Level 3 — — Ending balance March 31, $ — 9,877
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 March 31, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 28,751 28,751 Real estate owned — — 4,041 4,041 Total assets $ — — 32,792 32,792 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 March 31, 2018 (dollar amounts in thousands): Fair value Valuation techniques Significant unobservable inputs Range (weighted average) Loans measured for impairment 28,751 Appraisal value (1) Estimated cost to sell 10.0% Discounted cash flow Discount rate 4.25% to 10.0% (7.50%) Real estate owned 4,041 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 Instrume31

Derivative Financial Instruments - (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2018 Derivatives designed as hedging instruments: Interest rate swap agreements $ — — 50,000 609 Derivatives not designed as hedging instruments: Interest rate swap agreements 125,394 2,971 125,394 2,971 Foreign exchange swap agreements — — 5,558 13 Total derivatives $ 125,394 2,971 180,952 3,593 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 March 31, 2018 2017 Non-hedging swap derivatives: Increase/ (decrease) in other income $ 129 (34 ) Hedging interest rate derivatives: Increase in interest expense 332 419

Changes in Accumulated Other 32

Changes in Accumulated Other Comprehensive Income/ (Loss) (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 before reclassification adjustments (3,955 ) 360 — (3,595 ) Amounts reclassified from accumulated other comprehensive income (1), (2) (26 ) — 226 200 Net other comprehensive income (4,972 ) 211 (5,380 ) (10,141 ) Balance as of March 31, 2018 $ (9,381 ) (480 ) (32,360 ) (42,221 ) For the quarter ended March 31, 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 658 303 — 961 Amounts reclassified from accumulated other comprehensive income (3), (4) (11 ) — 220 209 Net other comprehensive income 647 303 220 1,170 Balance as of March 31, 2017 $ 1,042 (1,475 ) (26,388 ) (26,821 ) (1) Consists of realized gain on securities (gain on sales of investments, net) of $33 , net of tax (income tax expense) of $(7) . (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 loss on securities (gain on sales of investments, net) of $19 , net of tax (income tax expense) of $(8) . (4) Consists of amortization of prior service cost (compensation and employee benefits) of $581 and amortization of net loss (compensation and employee benefits) of $(954) , net of tax (income tax expense) of $153 .

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Schedule of revenue sources of non-interest income	All revenue from contracts with customers in the scope of ASC 606 is recognized within noninterest income. The following table presents sources of non-interest income for the periods indicated. Items outside the scope of ASC 606 are noted as such. For the quarter ended March 31, 2018 2017 Service charges on deposits $ 4,920 5,197 Loan servicing fees (1) 565 411 Interchange income 6,414 6,109 Total service charges and fees 11,899 11,717 Gain/(loss) on the sale of investments (1) 153 17 Trust and other financial services income 4,031 4,304 Insurance commission income 2,749 2,794 Loss on real estate owned, net (546 ) (67 ) Income from bank owned life insurance (1) 990 1,068 Mortgage banking income (1) 224 240 Other operating income (2) 2,288 1,431 Total non-interest income $ 21,788 21,504 (1) Not within the scope of ASC 606. (2) Other operating income includes of $621 and $212 for the periods ended March 31, 2018 and March 31, 2017 , respectively, which was explicitly excluded from the scope of ASU 2014-09.

Basis of Presentation and Inf34

Basis of Presentation and Informational Disclosures (Details)	3 Months Ended
	Mar. 31, 2018USD ($)bank	Mar. 31, 2017USD ($)
Stock Related Compensation
Number of banking locations | bank	172
Compensation and employee benefits	$ (36,510,000)	$ (38,272,000)
Other expenses	3,032,000	3,034,000
Reclassification due to adoption of ASU No. 2018-02	6,746,000
Stock-Based Compensation
Stock-based compensation expense	978,000	918,000
Income Taxes - Uncertain Tax Positions
Unrecognized tax benefits liability	0
Employee Stock Ownership Plan
Stock-Based Compensation
Compensation expense yet to be recognized	3,700,000
Restricted common shares
Stock-Based Compensation
Compensation expense yet to be recognized	$ 14,600,000
Accounting Standards Update 2017-07
Stock Related Compensation
Compensation and employee benefits		517,000
Other expenses		$ 517,000

Investment securities and imp35

Investment securities and impairment of investment securities - Available For Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized cost
Total debt securities	$ 771,110
Total available for sale securities	771,110	$ 800,094
Gross unrealized holding gains
Total debt securities	2,824
Total		3,453
Gross unrealized holding losses
Total debt securities	(15,958)
Total		(11,012)
Fair value
Fair value debt securities	757,976
Fair value available for sale securities		792,535
U.S. government and agencies
Amortized cost
Due in one year or less	1	1
Gross unrealized holding gains
Due in one year or less	0	0
Gross unrealized holding losses
Due in one year or less	0	0
Fair value
Due in one year or less	1	1
Debt issued by government sponsored enterprises:
Amortized cost
Due in one year or less	66,007	66,566
Due after one year through five years	135,355	140,624
Due after ten years	4,381	4,833
Gross unrealized holding gains
Due in one year or less	1	14
Due after one year through five years	0	0
Due after ten years	0	0
Gross unrealized holding losses
Due in one year or less	(241)	(289)
Due after one year through five years	(3,139)	(2,402)
Due after ten years	(69)	(77)
Fair value
Due in one year or less	65,767	66,291
Due after one year through five years	132,216	138,222
Due after ten years	4,312	4,756
Equity securities
Amortized cost
Total available for sale securities		551
Gross unrealized holding gains
Total		29
Gross unrealized holding losses
Total		(6)
Fair value
Fair value available for sale securities		574
Municipal securities
Amortized cost
Due in one year or less	2,487	2,492
Due after one year through five years	5,115	7,072
Due after five years through ten years	15,168	14,576
Due after ten years	18,085	26,371
Gross unrealized holding gains
Due in one year or less	10	7
Due after one year through five years	59	82
Due after five years through ten years	95	171
Due after ten years	113	292
Gross unrealized holding losses
Due in one year or less	0	(1)
Due after one year through five years	(10)	(6)
Due after five years through ten years	(15)	0
Due after ten years	(6)	0
Fair value
Due in one year or less	2,497	2,498
Due after one year through five years	5,164	7,148
Due after five years through ten years	15,248	14,747
Due after ten years	18,192	26,663
Corporate debt securities
Amortized cost
Due after ten years	910	909
Gross unrealized holding gains
Due after ten years	0	0
Gross unrealized holding losses
Due after ten years	0	0
Fair value
Due after ten years	910	909
Residential mortgage-backed securities
Amortized cost
Total debt securities	523,601
Total available for sale securities		536,099
Gross unrealized holding gains
Total debt securities	2,546
Total		2,858
Gross unrealized holding losses
Total debt securities	(12,478)
Total		(8,231)
Fair value
Fair value debt securities	513,669
Fair value available for sale securities		530,726
Fixed rate | Pass-through
Amortized cost
Total debt securities	142,425
Total available for sale securities		144,411
Gross unrealized holding gains
Total debt securities	843
Total		1,108
Gross unrealized holding losses
Total debt securities	(4,605)
Total		(2,817)
Fair value
Fair value debt securities	138,663
Fair value available for sale securities		142,702
Fixed rate | Non-agency CMOs
Amortized cost
Total debt securities	1
Total available for sale securities		15
Gross unrealized holding gains
Total debt securities	0
Total		0
Gross unrealized holding losses
Total debt securities	0
Total		0
Fair value
Fair value debt securities	1
Fair value available for sale securities		15
Fixed rate | Agency CMOs
Amortized cost
Total debt securities	278,288
Total available for sale securities		284,320
Gross unrealized holding gains
Total debt securities	21
Total		37
Gross unrealized holding losses
Total debt securities	(7,833)
Total		(5,271)
Fair value
Fair value debt securities	270,476
Fair value available for sale securities		279,086
Variable rate | Pass-through
Amortized cost
Total debt securities	31,270
Total available for sale securities		33,079
Gross unrealized holding gains
Total debt securities	1,301
Total		1,464
Gross unrealized holding losses
Total debt securities	(6)
Total		(6)
Fair value
Fair value debt securities	32,565
Fair value available for sale securities		34,537
Variable rate | Agency CMOs
Amortized cost
Total debt securities	71,617
Total available for sale securities		74,274
Gross unrealized holding gains
Total debt securities	381
Total		249
Gross unrealized holding losses
Total debt securities	(34)
Total		(137)
Fair value
Fair value debt securities	$ 71,964
Fair value available for sale securities		$ 74,386

Investment securities and imp36

Investment securities and impairment of investment securities - Held To Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized cost
Marketable securities held-to-maturity, amortized cost	$ 27,709	$ 29,678
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	171	237
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	(556)	(248)
Fair value
Marketable securities held-to-maturity, fair value	27,324	29,667
Residential mortgage-backed securities
Amortized cost
Marketable securities held-to-maturity, amortized cost	27,709	29,678
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	171	237
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	(556)	(248)
Fair value
Marketable securities held-to-maturity, fair value	27,324	29,667
Fixed rate | Pass-through
Amortized cost
Marketable securities held-to-maturity, amortized cost	3,489	3,760
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	98	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	3,587	3,900
Fixed rate | Agency CMOs
Amortized cost
Marketable securities held-to-maturity, amortized cost	21,363	22,906
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	4	20
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	(556)	(248)
Fair value
Marketable securities held-to-maturity, fair value	20,811	22,678
Variable rate | Pass-through
Amortized cost
Marketable securities held-to-maturity, amortized cost	2,185	2,283
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	58	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	2,243	2,347
Variable rate | Agency CMOs
Amortized cost
Marketable securities held-to-maturity, amortized cost	672	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	$ 683	$ 742

Investment securities and imp37

Investment securities and impairment of investment securities - Fair Value of and Gross Unrealized Losses on Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Marketable securities
Less than 12 months - Fair value	$ 262,134	$ 249,272
Less than 12 months - Unrealized loss	(5,238)	(2,536)
12 months or more - Fair value	382,040	400,583
12 months or more - Unrealized loss	(11,276)	(8,724)
Total - Fair value	644,174	649,855
Total - Unrealized loss	(16,514)	(11,260)
U.S. government and agencies
Marketable securities
Less than 12 months - Fair value	4,982	5,006
Less than 12 months - Unrealized loss	(29)	(7)
12 months or more - Fair value	191,381	197,695
12 months or more - Unrealized loss	(3,420)	(2,761)
Total - Fair value	196,363	202,701
Total - Unrealized loss	(3,449)	(2,768)
Municipal securities
Marketable securities
Less than 12 months - Fair value	7,127	4,563
Less than 12 months - Unrealized loss	(31)	(7)
12 months or more - Fair value	0	0
12 months or more - Unrealized loss	0	0
Total - Fair value	7,127	4,563
Total - Unrealized loss	(31)	(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	250,025	239,703
Less than 12 months - Unrealized loss	(5,178)	(2,522)
12 months or more - Fair value	190,659	202,344
12 months or more - Unrealized loss	(7,856)	(5,957)
Total - Fair value	440,684	442,047
Total - Unrealized loss	$ (13,034)	$ (8,479)

Investment securities and imp38

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
	Mar. 31, 2018	Mar. 31, 2017
Cumulative roll forward of credit related impairment losses recognized in earnings for debt securities held and not intended to be sold:
Beginning balance	$ 352	$ 7,942
Credit losses on debt securities for which other-than-temporary impairment was not previously recognized	0	0
Reduction for losses realized during the quarter	(352)
Reduction for securities sold/ called realized during the quarter		0
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized	0	0
Ending balance	$ 0	$ 7,942

Loans receivable - Summary of O

Loans receivable - Summary of Originated and Acquired Loans (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	$ 8,076,251,000	$ 7,972,735,000
Deferred loan costs	28,584,000	27,782,000
Allowance for loan losses	(55,211,000)	(56,795,000)	$ (61,104,000)	$ (60,939,000)
Total loans receivable, net	7,827,056,000	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	(8,026,000)	(10,067,000)
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(150,686,000)	(144,614,000)
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(63,856,000)	(52,427,000)
Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	4,725,989,000	4,740,232,000
Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,766,974,000	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	1,288,361,000	1,310,355,000
Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	12,453,000	18,619,000
Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	658,201,000	638,709,000
Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	3,350,262,000	3,232,503,000
Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,662,943,000	2,599,340,000
Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	687,319,000	633,163,000
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	7,295,363,000	7,145,255,000
Deferred loan costs	27,291,000	26,255,000
Allowance for loan losses	(49,123,000)	(50,572,000)	(54,090,000)	(55,293,000)
Total loans receivable, net	7,054,874,000	6,917,761,000
Originated | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(8,026,000)	(10,067,000)
Originated | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(148,059,000)	(141,967,000)
Originated | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(62,572,000)	(51,143,000)
Originated | Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	4,285,239,000	4,269,735,000
Allowance for loan losses	(19,612,000)	(20,339,000)	(18,056,000)	(16,116,000)
Originated | Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,658,404,000	2,658,726,000
Allowance for loan losses	(3,724,000)	(3,824,000)	(4,638,000)	(4,656,000)
Originated | Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	1,040,328,000	1,051,558,000
Allowance for loan losses	(3,717,000)	(4,072,000)	(2,989,000)	(3,486,000)
Originated | Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	12,453,000	18,619,000
Allowance for loan losses	(3,031,000)	(3,968,000)	(3,957,000)	(3,445,000)
Originated | Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	574,054,000	540,832,000
Allowance for loan losses	(9,140,000)	(8,475,000)	(6,472,000)	(4,529,000)
Originated | Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	3,010,124,000	2,875,520,000
Allowance for loan losses	(29,511,000)	(30,233,000)	(36,034,000)	(39,177,000)
Originated | Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,383,303,000	2,303,179,000
Allowance for loan losses	(20,218,000)	(19,911,000)	(20,635,000)	(23,667,000)
Originated | Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	626,821,000	572,341,000
Allowance for loan losses	(9,293,000)	(10,322,000)	(15,399,000)	(15,510,000)
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	780,888,000	827,480,000
Deferred loan costs	1,293,000	1,527,000
Allowance for loan losses	(6,088,000)	(6,223,000)	(7,014,000)	(5,646,000)
Total loans receivable, net	772,182,000	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	(2,627,000)	(2,647,000)
Acquired | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(1,284,000)	(1,284,000)
Acquired | Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	440,750,000	470,497,000
Allowance for loan losses	(1,624,000)	(1,783,000)	(1,841,000)	(1,771,000)
Acquired | Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	108,570,000	113,823,000
Allowance for loan losses	(89,000)	(131,000)	(78,000)	(71,000)
Acquired | Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	248,033,000	258,797,000
Allowance for loan losses	(728,000)	(762,000)	(932,000)	(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	84,147,000	97,877,000
Allowance for loan losses	(807,000)	(890,000)	(831,000)	(653,000)
Acquired | Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	340,138,000	356,983,000
Allowance for loan losses	(4,464,000)	(4,440,000)
Acquired | Commercial Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			(3,713,000)	(3,008,000)
Acquired | Commercial Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			(1,460,000)	(867,000)
Acquired | Commercial Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			$ (5,173,000)	$ (3,875,000)
Acquired | Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	279,640,000	296,161,000
Allowance for loan losses	(3,430,000)	(3,549,000)
Acquired | Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	60,498,000	60,822,000
Allowance for loan losses	$ (1,034,000)	$ (891,000)

Loans receivable - Outstanding

Loans receivable - Outstanding Principal Balance and Related Carrying Value of Acquired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	$ 786,376	$ 833,940
Carrying value	778,270	825,076
Acquired loans evaluated individually for future credit losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	9,453	9,735
Carrying value	6,720	6,875
Acquired loans evaluated collectively for future credit losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	776,923	824,205
Carrying value	$ 771,550	$ 818,201

Loans receivable - Changes in t

Loans receivable - Changes in the Accretable Discount (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Changes in accretable yield
Beginning balance	$ 1,540	$ 2,187
Accretion	(185)	(1,318)
Net reclassification from nonaccretable yield	0	671
Ending balance	$ 1,355	$ 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	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	$ 78,657	$ 84,625
Average recorded investment in impaired loans	80,049	97,193
Interest income recognized	914	3,982
Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	32,524	36,833
Average recorded investment in impaired loans	33,987	35,102
Interest income recognized	420	1,552
Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	19,731	21,605
Average recorded investment in impaired loans	19,912	21,531
Interest income recognized	236	892
Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	9,233	10,356
Average recorded investment in impaired loans	9,873	9,150
Interest income recognized	127	452
Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	3,557	4,673
Average recorded investment in impaired loans	4,161	4,042
Interest income recognized	55	188
Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	46,133	47,792
Average recorded investment in impaired loans	46,062	62,091
Interest income recognized	494	2,430
Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	37,307	37,027
Average recorded investment in impaired loans	36,467	49,981
Interest income recognized	379	1,758
Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	8,826	10,765
Average recorded investment in impaired loans	9,595	12,110
Interest income recognized	115	672
Acquired loans evaluated individually for future credit losses
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	6,720	6,875
Outstanding principal balance	9,453	9,735
Related impairment reserve	81	88
Average recorded investment in impaired loans	6,798	9,770
Interest income recognized	185	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	2,315	2,384
Outstanding principal balance	4,106	4,259
Related impairment reserve	42	49
Average recorded investment in impaired loans	2,350	2,601
Interest income recognized	91	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	1,167	1,182
Outstanding principal balance	1,858	1,880
Related impairment reserve	18	24
Average recorded investment in impaired loans	1,175	1,251
Interest income recognized	39	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	1,104	1,143
Outstanding principal balance	2,123	2,219
Related impairment reserve	20	21
Average recorded investment in impaired loans	1,124	1,253
Interest income recognized	36	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	44	59
Outstanding principal balance	125	160
Related impairment reserve	4	4
Average recorded investment in impaired loans	51	97
Interest income recognized	16	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	4,405	4,491
Outstanding principal balance	5,347	5,476
Related impairment reserve	39	39
Average recorded investment in impaired loans	4,448	7,169
Interest income recognized	94	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	4,327	4,388
Outstanding principal balance	5,262	5,363
Related impairment reserve	39	39
Average recorded investment in impaired loans	4,358	6,992
Interest income recognized	89	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	90	177
Interest income recognized	$ 5	$ 15

Loans receivable - Changes in43

Loans receivable - Changes in the Allowance for Losses on Loans Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	$ 56,795	$ 60,939
Current period provision	4,209	4,637
Charge-offs	(7,190)	(6,340)
Recoveries	1,397	1,868
Balance at the end of the period	55,211	61,104
Originated
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	50,572	55,293
Current period provision	3,926	2,371
Charge-offs	(6,595)	(4,790)
Recoveries	1,220	1,216
Balance at the end of the period	49,123	54,090
Originated | Personal Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	20,339	16,116
Current period provision	3,563	4,910
Charge-offs	(5,227)	(3,581)
Recoveries	937	611
Balance at the end of the period	19,612	18,056
Originated | Personal Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	3,824	4,656
Current period provision	31	(33)
Charge-offs	(196)	(153)
Recoveries	65	168
Balance at the end of the period	3,724	4,638
Originated | Personal Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	4,072	3,486
Current period provision	(85)	(406)
Charge-offs	(301)	(176)
Recoveries	31	85
Balance at the end of the period	3,717	2,989
Originated | Personal Banking | Consumer finance loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	3,968	3,445
Current period provision	338	1,202
Charge-offs	(1,553)	(796)
Recoveries	278	106
Balance at the end of the period	3,031	3,957
Originated | Personal Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	8,475	4,529
Current period provision	3,279	4,147
Charge-offs	(3,177)	(2,456)
Recoveries	563	252
Balance at the end of the period	9,140	6,472
Originated | Commercial Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	30,233	39,177
Current period provision	363	(2,539)
Charge-offs	(1,368)	(1,209)
Recoveries	283	605
Balance at the end of the period	29,511	36,034
Originated | Commercial Banking | Commercial real estate loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	19,911	23,667
Current period provision	703	(2,948)
Charge-offs	(540)	(263)
Recoveries	144	179
Balance at the end of the period	20,218	20,635
Originated | Commercial Banking | Commercial loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	10,322	15,510
Current period provision	(340)	409
Charge-offs	(828)	(946)
Recoveries	139	426
Balance at the end of the period	9,293	15,399
Acquired
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	6,223	5,646
Current period provision	283	2,266
Charge-offs	(595)	(1,550)
Recoveries	177	652
Balance at the end of the period	6,088	7,014
Acquired | Personal Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	1,783	1,771
Current period provision	105	698
Charge-offs	(387)	(1,018)
Recoveries	123	390
Balance at the end of the period	1,624	1,841
Acquired | Personal Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	131	71
Current period provision	(43)	115
Charge-offs	(5)	(137)
Recoveries	6	29
Balance at the end of the period	89	78
Acquired | Personal Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	762	1,047
Current period provision	202	180
Charge-offs	(310)	(473)
Recoveries	74	178
Balance at the end of the period	728	932
Acquired | Personal Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	890	653
Current period provision	(54)	403
Charge-offs	(72)	(408)
Recoveries	43	183
Balance at the end of the period	807	831
Acquired | Commercial Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	4,440
Current period provision	178
Charge-offs	(208)
Recoveries	54
Balance at the end of the period	4,464
Acquired | Commercial Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period		3,008
Current period provision		666
Charge-offs		(211)
Recoveries		250
Balance at the end of the period		3,713
Acquired | Commercial Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period		867
Current period provision		902
Charge-offs		(321)
Recoveries		12
Balance at the end of the period		1,460
Acquired | Commercial Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period		3,875
Current period provision		1,568
Charge-offs		(532)
Recoveries		262
Balance at the end of the period		$ 5,173
Acquired | Commercial Banking | Commercial real estate loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	3,549
Current period provision	(130)
Charge-offs	(11)
Recoveries	22
Balance at the end of the period	3,430
Acquired | Commercial Banking | Commercial loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	891
Current period provision	308
Charge-offs	(197)
Recoveries	32
Balance at the end of the period	$ 1,034

Loans receivable - Loan Portfol

Loans receivable - Loan Portfolio by Portfolio Segment and by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 7,882,267	$ 7,793,409
Allowance for loan losses	55,211	56,795
Nonaccrual loans	58,680	64,455
Loans past due 90 days or more and still accruing	210	502
TDRs	30,966	32,104	$ 43,578	$ 42,926
Allowance related to TDRs	2,573	3,144
Additional commitments to customers with loans classified as TDRs	371	247
Nonaccrual TDRs	11,217	12,300	$ 18,273
Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	4,746,547	4,757,947
Allowance for loan losses	21,236	22,122
Nonaccrual loans	24,061	28,570
Loans past due 90 days or more and still accruing	210	502
TDRs	9,580	9,716
Allowance related to TDRs	1,229	1,277
Additional commitments to customers with loans classified as TDRs	5	4
Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	2,772,148	2,776,203
Allowance for loan losses	3,813	3,955
Nonaccrual loans	12,828	14,791
Loans past due 90 days or more and still accruing	0	0
TDRs	7,756	8,000
Allowance related to TDRs	762	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	1,288,361	1,310,355
Allowance for loan losses	4,445	4,834
Nonaccrual loans	7,673	8,907
Loans past due 90 days or more and still accruing	89	120
TDRs	1,824	1,716
Allowance related to TDRs	467	462
Additional commitments to customers with loans classified as TDRs	5	4
Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	12,453	18,619
Allowance for loan losses	3,031	3,968
Nonaccrual loans	3	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	673,585	652,770
Allowance for loan losses	9,947	9,365
Nonaccrual loans	3,557	4,673
Loans past due 90 days or more and still accruing	121	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	3,135,720	3,035,462
Allowance for loan losses	33,975	34,673
Nonaccrual loans	34,619	35,885
Loans past due 90 days or more and still accruing	0	0
TDRs	21,386	22,388
Allowance related to TDRs	1,344	1,867
Additional commitments to customers with loans classified as TDRs	366	243
Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	2,512,257	2,454,726
Allowance for loan losses	23,648	23,460
Nonaccrual loans	28,874	28,473
Loans past due 90 days or more and still accruing	0	0
TDRs	16,285	15,691
Allowance related to TDRs	977	1,125
Additional commitments to customers with loans classified as TDRs	328	235
Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	623,463	580,736
Allowance for loan losses	10,327	11,213
Nonaccrual loans	5,745	7,412
Loans past due 90 days or more and still accruing	0	0
TDRs	5,101	6,697
Allowance related to TDRs	367	742
Additional commitments to customers with loans classified as TDRs	$ 38	$ 8

Loans receivable - Compositio45

Loans receivable - Composition of Impaired Loans by Portfolio Segment and Class of Financing Receivable (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	$ 58,680	$ 64,455
Total impaired loans	78,657	84,625
Average recorded investment in impaired loans	80,049	97,193
Interest income recognized on impaired loans	914	3,982
Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	24,061	28,570
Total impaired loans	32,524	36,833
Average recorded investment in impaired loans	33,987	35,102
Interest income recognized on impaired loans	420	1,552
Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	12,828	14,791
Total impaired loans	19,731	21,605
Average recorded investment in impaired loans	19,912	21,531
Interest income recognized on impaired loans	236	892
Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	7,673	8,907
Total impaired loans	9,233	10,356
Average recorded investment in impaired loans	9,873	9,150
Interest income recognized on impaired loans	127	452
Personal Banking | Consumer finance loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	3	199
Total impaired loans	3	199
Average recorded investment in impaired loans	41	379
Interest income recognized on impaired loans	2	20
Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	3,557	4,673
Total impaired loans	3,557	4,673
Average recorded investment in impaired loans	4,161	4,042
Interest income recognized on impaired loans	55	188
Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	34,619	35,885
Total impaired loans	46,133	47,792
Average recorded investment in impaired loans	46,062	62,091
Interest income recognized on impaired loans	494	2,430
Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	28,874	28,473
Total impaired loans	37,307	37,027
Average recorded investment in impaired loans	36,467	49,981
Interest income recognized on impaired loans	379	1,758
Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	5,745	7,412
Total impaired loans	8,826	10,765
Average recorded investment in impaired loans	9,595	12,110
Interest income recognized on impaired loans	115	672
90 Days or greater delinquent
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	39,590	43,077
90 Days or greater delinquent | Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	20,301	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	10,660	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	6,707	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	3	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	2,931	3,617
90 Days or greater delinquent | Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	19,289	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	16,145	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	3,144	3,140
Less than 90 days delinquent
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	19,090	21,378
Loans less than 90 days delinquent reviewed for impairment	5,623	5,337
TDRs less than 90 days delinquent not included elsewhere	14,354	14,833
Less than 90 days delinquent | Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	3,760	3,994
Loans less than 90 days delinquent reviewed for impairment	505	0
TDRs less than 90 days delinquent not included elsewhere	7,958	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	2,168	1,282
Loans less than 90 days delinquent reviewed for impairment	505	0
TDRs less than 90 days delinquent not included elsewhere	6,398	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	966	1,656
Loans less than 90 days delinquent reviewed for impairment	0	0
TDRs less than 90 days delinquent not included elsewhere	1,560	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	626	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	15,330	17,384
Loans less than 90 days delinquent reviewed for impairment	5,118	5,337
TDRs less than 90 days delinquent not included elsewhere	6,396	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	12,729	13,112
Loans less than 90 days delinquent reviewed for impairment	4,398	4,431
TDRs less than 90 days delinquent not included elsewhere	4,035	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	2,601	4,272
Loans less than 90 days delinquent reviewed for impairment	720	906
TDRs less than 90 days delinquent not included elsewhere	$ 2,361	$ 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	Mar. 31, 2018	Dec. 31, 2017
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	$ 7,843,239	$ 7,752,745
Loans individually evaluated for impairment	39,028	40,664
Loans individually evaluated for impairment for which there is a related impairment reserve	32,129	37,411
Related impairment reserve	3,378	3,990
Loans individually evaluated for impairment for which there is no related reserve	6,899	3,253
Personal Banking
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	4,736,340	4,747,578
Loans individually evaluated for impairment	10,207	10,369
Loans individually evaluated for impairment for which there is a related impairment reserve	10,207	10,369
Related impairment reserve	1,254	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	2,763,824	2,767,635
Loans individually evaluated for impairment	8,324	8,568
Loans individually evaluated for impairment for which there is a related impairment reserve	8,324	8,568
Related impairment reserve	780	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	1,286,538	1,308,639
Loans individually evaluated for impairment	1,823	1,716
Loans individually evaluated for impairment for which there is a related impairment reserve	1,823	1,716
Related impairment reserve	458	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	12,453	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	673,525	652,685
Loans individually evaluated for impairment	60	85
Loans individually evaluated for impairment for which there is a related impairment reserve	60	85
Related impairment reserve	16	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	3,106,899	3,005,167
Loans individually evaluated for impairment	28,821	30,295
Loans individually evaluated for impairment for which there is a related impairment reserve	21,922	27,042
Related impairment reserve	2,124	2,688
Loans individually evaluated for impairment for which there is no related reserve	6,899	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	2,490,757	2,433,755
Loans individually evaluated for impairment	21,500	20,971
Loans individually evaluated for impairment for which there is a related impairment reserve	16,786	18,470
Related impairment reserve	1,668	1,859
Loans individually evaluated for impairment for which there is no related reserve	4,714	2,501
Commercial Banking | Commercial loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	616,142	571,412
Loans individually evaluated for impairment	7,321	9,324
Loans individually evaluated for impairment for which there is a related impairment reserve	5,136	8,572
Related impairment reserve	456	829
Loans individually evaluated for impairment for which there is no related reserve	$ 2,185	$ 752

Loans receivable - Roll Forward

Loans receivable - Roll Forward of Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)contract	Mar. 31, 2017USD ($)contract	Dec. 31, 2017USD ($)
Number of contracts
Beginning balance | contract	205	225
Number of contracts new TDRs | contract	9	6
Number of re-modified TDRs | contract	0	0
Ending balance | contract	200	224
Amount
Beginning TDR balance	$ 32,104	$ 42,926
New TDRs	4,935	3,790
Re-modified TDRs	0	0
Net paydowns	(947)	(1,222)
Ending TDR balance	30,966	43,578
Accruing TDRs	19,749	25,305
Non-accrual TDRs	$ 11,217	$ 18,273	$ 12,300
Residential mortgage loans
Number of contracts
Number of contracts charged off | contract	1	0
Number of contracts paid off | contract	1	0
Amount
Amount of contracts charged off	$ (135)	$ 0
Amount of contracts paid off	$ (249)	$ 0
Home equity loans
Number of contracts
Number of contracts charged off | contract	0	0
Number of contracts paid off | contract	1	1
Amount
Amount of contracts charged off	$ 0	$ 0
Amount of contracts paid off	$ (12)	$ 0
Commercial real estate loans
Number of contracts
Number of contracts charged off | contract	1	0
Number of contracts paid off | contract	4	2
Amount
Amount of contracts charged off	$ (203)	$ 0
Amount of contracts paid off	$ (1,574)	$ (65)
Commercial loans
Number of contracts
Number of contracts charged off | contract	1	1
Number of contracts paid off | contract	5	3
Amount
Amount of contracts charged off	$ (721)	$ (101)
Amount of contracts paid off	$ (2,232)	$ (1,750)

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
	Mar. 31, 2018USD ($)contract	Mar. 31, 2017USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	9	6
Recorded investment at the time of modification	$ 4,935	$ 3,790
Current recorded investment	4,168	3,765
Current allowance	$ 57	$ 287
Number of modified TDRs that have subsequently defaulted | contract	0	0
Personal Banking
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	5	2
Recorded investment at the time of modification	$ 354	$ 448
Current recorded investment	352	447
Current allowance	$ 57	$ 48
Personal Banking | Residential mortgage loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	2
Recorded investment at the time of modification	$ 214	$ 448
Current recorded investment	213	447
Current allowance	$ 21	$ 48
Personal Banking | Home equity loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3	0
Recorded investment at the time of modification	$ 140	$ 0
Current recorded investment	139	0
Current allowance	$ 36	$ 0
Commercial Banking
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	4
Recorded investment at the time of modification	$ 4,581	$ 3,342
Current recorded investment	3,816	3,318
Current allowance	$ 0	$ 239
Commercial Banking | Commercial real estate loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1	3
Recorded investment at the time of modification	$ 2,401	$ 3,138
Current recorded investment	2,385	3,119
Current allowance	$ 0	$ 225
Commercial Banking | Commercial loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3	1
Recorded investment at the time of modification	$ 2,180	$ 204
Current recorded investment	1,431	199
Current allowance	$ 0	$ 14

Loans receivable - Troubled D49

Loans receivable - Troubled Debt Restructurings by Type of Modification (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)contract	Mar. 31, 2017USD ($)contract
Troubled debt restructurings
Number of contracts | contract	9	6
Troubled debt restructurings	$ 4,168	$ 3,765
Number of re-modified TDRs | contract	0	0
Rate
Troubled debt restructurings
Troubled debt restructurings	$ 30	$ 112
Payment
Troubled debt restructurings
Troubled debt restructurings	0	2,755
Maturity date
Troubled debt restructurings
Troubled debt restructurings	178	563
Other
Troubled debt restructurings
Troubled debt restructurings	$ 3,960	$ 335
Personal Banking
Troubled debt restructurings
Number of contracts | contract	5	2
Troubled debt restructurings	$ 352	$ 447
Personal Banking | Rate
Troubled debt restructurings
Troubled debt restructurings	30	112
Personal Banking | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0
Personal Banking | Maturity date
Troubled debt restructurings
Troubled debt restructurings	178	0
Personal Banking | Other
Troubled debt restructurings
Troubled debt restructurings	$ 144	$ 335
Personal Banking | Residential mortgage loans
Troubled debt restructurings
Number of contracts | contract	2	2
Troubled debt restructurings	$ 213	$ 447
Personal Banking | Residential mortgage loans | Rate
Troubled debt restructurings
Troubled debt restructurings	0	112
Personal Banking | Residential mortgage loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0
Personal Banking | Residential mortgage loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	178	0
Personal Banking | Residential mortgage loans | Other
Troubled debt restructurings
Troubled debt restructurings	$ 35	$ 335
Personal Banking | Home equity loans
Troubled debt restructurings
Number of contracts | contract	3	0
Troubled debt restructurings	$ 139	$ 0
Personal Banking | Home equity loans | Rate
Troubled debt restructurings
Troubled debt restructurings	30	0
Personal Banking | Home equity loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0
Personal Banking | Home equity loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	0	0
Personal Banking | Home equity loans | Other
Troubled debt restructurings
Troubled debt restructurings	$ 109	$ 0
Commercial Banking
Troubled debt restructurings
Number of contracts | contract	4	4
Troubled debt restructurings	$ 3,816	$ 3,318
Commercial Banking | Rate
Troubled debt restructurings
Troubled debt restructurings	0	0
Commercial Banking | Payment
Troubled debt restructurings
Troubled debt restructurings	0	2,755
Commercial Banking | Maturity date
Troubled debt restructurings
Troubled debt restructurings	0	563
Commercial Banking | Other
Troubled debt restructurings
Troubled debt restructurings	$ 3,816	$ 0
Commercial Banking | Commercial real estate loans
Troubled debt restructurings
Number of contracts | contract	1	3
Troubled debt restructurings	$ 2,385	$ 3,119
Commercial Banking | Commercial real estate loans | Rate
Troubled debt restructurings
Troubled debt restructurings	0	0
Commercial Banking | Commercial real estate loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	2,755
Commercial Banking | Commercial real estate loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	0	364
Commercial Banking | Commercial real estate loans | Other
Troubled debt restructurings
Troubled debt restructurings	$ 2,385	$ 0
Commercial Banking | Commercial loans
Troubled debt restructurings
Number of contracts | contract	3	1
Troubled debt restructurings	$ 1,431	$ 199
Commercial Banking | Commercial loans | Rate
Troubled debt restructurings
Troubled debt restructurings	0	0
Commercial Banking | Commercial loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0
Commercial Banking | Commercial loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	0	199
Commercial Banking | Commercial loans | Other
Troubled debt restructurings
Troubled debt restructurings	$ 1,431	$ 0

Loans receivable - Loan Delinqu

Loans receivable - Loan Delinquencies (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loan payment delinquencies
Total delinquency	$ 116,394	$ 117,504
Current	7,765,873	7,675,905
Total loans	7,882,267	7,793,409
90 days or greater delinquent and accruing	760	1,412
30-59 Days delinquent
Loan payment delinquencies
Total delinquency	67,564	56,465
60-89 Days delinquent
Loan payment delinquencies
Total delinquency	8,480	16,550
90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	40,350	44,489
Personal Banking
Loan payment delinquencies
Total loans	4,746,547	4,757,947
Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total loans	2,772,148	2,776,203
Personal Banking | Home equity loans
Loan payment delinquencies
Total loans	1,288,361	1,310,355
Personal Banking | Consumer finance loans
Loan payment delinquencies
Total loans	12,453	18,619
Personal Banking | Consumer loans
Loan payment delinquencies
Total loans	673,585	652,770
Commercial Banking
Loan payment delinquencies
Total loans	3,135,720	3,035,462
Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total loans	2,512,257	2,454,726
Commercial Banking | Commercial loans
Loan payment delinquencies
Total loans	623,463	580,736
Originated
Loan payment delinquencies
Total delinquency	100,776	98,970
Current	7,003,221	6,869,363
Total loans	7,103,997	6,968,333
90 days or greater delinquent and accruing	0	0
Originated | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	61,187	48,759
Originated | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	6,458	14,647
Originated | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	33,131	35,564
Originated | Personal Banking
Loan payment delinquencies
Total delinquency	63,794	76,209
Current	4,240,710	4,209,714
Total loans	4,304,504	4,285,923
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total delinquency	37,049	42,429
Current	2,626,529	2,619,951
Total loans	2,663,578	2,662,380
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Home equity loans
Loan payment delinquencies
Total delinquency	13,135	14,470
Current	1,027,193	1,037,088
Total loans	1,040,328	1,051,558
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Consumer finance loans
Loan payment delinquencies
Total delinquency	1,524	3,440
Current	10,929	15,179
Total loans	12,453	18,619
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Consumer loans
Loan payment delinquencies
Total delinquency	12,086	15,870
Current	576,059	537,496
Total loans	588,145	553,366
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	40,616	41,770
Originated | Personal Banking | 30-59 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	26,001	23,786
Originated | Personal Banking | 30-59 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	5,850	6,094
Originated | Personal Banking | 30-59 Days delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	1,288	2,128
Originated | Personal Banking | 30-59 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	7,477	9,762
Originated | Personal Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	4,830	12,310
Originated | Personal Banking | 60-89 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	811	6,030
Originated | Personal Banking | 60-89 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	1,664	2,333
Originated | Personal Banking | 60-89 Days delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	233	1,113
Originated | Personal Banking | 60-89 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	2,122	2,834
Originated | Personal Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	18,348	22,129
Originated | Personal Banking | 90 Days or greater delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	10,237	12,613
Originated | Personal Banking | 90 Days or greater delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	5,621	6,043
Originated | Personal Banking | 90 Days or greater delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	3	199
Originated | Personal Banking | 90 Days or greater delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	2,487	3,274
Originated | Commercial Banking
Loan payment delinquencies
Total delinquency	36,982	22,761
Current	2,762,511	2,659,649
Total loans	2,799,493	2,682,410
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total delinquency	31,523	18,282
Current	2,203,721	2,142,930
Total loans	2,235,244	2,161,212
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | Commercial loans
Loan payment delinquencies
Total delinquency	5,459	4,479
Current	558,790	516,719
Total loans	564,249	521,198
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	20,571	6,989
Originated | Commercial Banking | 30-59 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	18,030	5,520
Originated | Commercial Banking | 30-59 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	2,541	1,469
Originated | Commercial Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	1,628	2,337
Originated | Commercial Banking | 60-89 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	1,536	2,133
Originated | Commercial Banking | 60-89 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	92	204
Originated | Commercial Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	14,783	13,435
Originated | Commercial Banking | 90 Days or greater delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	11,957	10,629
Originated | Commercial Banking | 90 Days or greater delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	2,826	2,806
Acquired
Loan payment delinquencies
Total delinquency	15,618	18,534
Current	762,652	806,542
Total loans	778,270	825,076
90 days or greater delinquent and accruing	760	1,412
Acquired | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	6,377	7,706
Acquired | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	2,022	1,903
Acquired | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	7,219	8,925
Acquired | Personal Banking
Loan payment delinquencies
Total delinquency	7,513	8,711
Current	434,530	463,313
Total loans	442,043	472,024
90 days or greater delinquent and accruing	182	489
Acquired | Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total delinquency	3,088	3,480
Current	105,482	110,343
Total loans	108,570	113,823
90 days or greater delinquent and accruing	131	381
Acquired | Personal Banking | Home equity loans
Loan payment delinquencies
Total delinquency	3,061	3,211
Current	244,972	255,586
Total loans	248,033	258,797
90 days or greater delinquent and accruing	43	98
Acquired | Personal Banking | Consumer loans
Loan payment delinquencies
Total delinquency	1,364	2,020
Current	84,076	97,384
Total loans	85,440	99,404
90 days or greater delinquent and accruing	8	10
Acquired | Personal Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	3,733	4,515
Acquired | Personal Banking | 30-59 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	1,402	1,998
Acquired | Personal Banking | 30-59 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	1,556	1,367
Acquired | Personal Banking | 30-59 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	775	1,150
Acquired | Personal Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	1,645	1,260
Acquired | Personal Banking | 60-89 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	1,132	205
Acquired | Personal Banking | 60-89 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	376	538
Acquired | Personal Banking | 60-89 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	137	517
Acquired | Personal Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	2,135	2,936
Acquired | Personal Banking | 90 Days or greater delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	554	1,277
Acquired | Personal Banking | 90 Days or greater delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	1,129	1,306
Acquired | Personal Banking | 90 Days or greater delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	452	353
Acquired | Commercial Banking
Loan payment delinquencies
Total delinquency	8,105	9,823
Current	328,122	343,229
Total loans	336,227	353,052
90 days or greater delinquent and accruing	578	923
Acquired | Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total delinquency	7,312	8,856
Current	269,701	284,658
Total loans	277,013	293,514
90 days or greater delinquent and accruing	578	923
Acquired | Commercial Banking | Commercial loans
Loan payment delinquencies
Total delinquency	793	967
Current	58,421	58,571
Total loans	59,214	59,538
90 days or greater delinquent and accruing	0	0
Acquired | Commercial Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	2,644	3,191
Acquired | Commercial Banking | 30-59 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	2,273	2,795
Acquired | Commercial Banking | 30-59 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	371	396
Acquired | Commercial Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	377	643
Acquired | Commercial Banking | 60-89 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	273	406
Acquired | Commercial Banking | 60-89 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	104	237
Acquired | Commercial Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	5,084	5,989
Acquired | Commercial Banking | 90 Days or greater delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	4,766	5,655
Acquired | Commercial Banking | 90 Days or greater delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	$ 318	$ 334

Loans receivable - Credit Quali

Loans receivable - Credit Quality Indicators (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Credit quality indicators
Total loans	$ 7,882,267,000	$ 7,793,409,000
Pass
Credit quality indicators
Total loans	7,530,315,000	7,452,732,000
Special mention
Credit quality indicators
Total loans	76,837,000	102,834,000
Substandard
Credit quality indicators
Total loans	275,115,000	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	4,746,547,000	4,757,947,000
Personal Banking | Residential mortgage loans
Credit quality indicators
Total loans	2,772,148,000	2,776,203,000
Personal Banking | Home equity loans
Credit quality indicators
Total loans	1,288,361,000	1,310,355,000
Personal Banking | Consumer finance loans
Credit quality indicators
Total loans	12,453,000	18,619,000
Personal Banking | Consumer loans
Credit quality indicators
Total loans	673,585,000	652,770,000
Commercial Banking
Credit quality indicators
Total loans	3,135,720,000	3,035,462,000
Commercial Banking | Commercial real estate loans
Credit quality indicators
Total loans	2,512,257,000	2,454,726,000
Commercial Banking | Commercial loans
Credit quality indicators
Total loans	623,463,000	580,736,000
Originated
Credit quality indicators
Total loans	7,103,997,000	6,968,333,000
Originated | Pass
Credit quality indicators
Total loans	6,805,106,000	6,682,937,000
Originated | Special mention
Credit quality indicators
Total loans	68,959,000	94,209,000
Originated | Substandard
Credit quality indicators
Total loans	229,932,000	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	4,304,504,000	4,285,923,000
Originated | Personal Banking | Pass
Credit quality indicators
Total loans	4,277,053,000	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	27,451,000	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	2,663,578,000	2,662,380,000
Originated | Personal Banking | Residential mortgage loans | Pass
Credit quality indicators
Total loans	2,646,948,000	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	16,630,000	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	1,040,328,000	1,051,558,000
Originated | Personal Banking | Home equity loans | Pass
Credit quality indicators
Total loans	1,032,575,000	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	7,753,000	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	12,453,000	18,619,000
Originated | Personal Banking | Consumer finance loans | Pass
Credit quality indicators
Total loans	12,450,000	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	3,000	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	588,145,000	553,366,000
Originated | Personal Banking | Consumer loans | Pass
Credit quality indicators
Total loans	585,080,000	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	3,065,000	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	2,799,493,000	2,682,410,000
Originated | Commercial Banking | Pass
Credit quality indicators
Total loans	2,528,053,000	2,426,527,000
Originated | Commercial Banking | Special mention
Credit quality indicators
Total loans	68,959,000	94,209,000
Originated | Commercial Banking | Substandard
Credit quality indicators
Total loans	202,481,000	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	2,235,244,000	2,161,212,000
Originated | Commercial Banking | Commercial real estate loans | Pass
Credit quality indicators
Total loans	2,018,908,000	1,964,565,000
Originated | Commercial Banking | Commercial real estate loans | Special mention
Credit quality indicators
Total loans	53,377,000	78,699,000
Originated | Commercial Banking | Commercial real estate loans | Substandard
Credit quality indicators
Total loans	162,959,000	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	564,249,000	521,198,000
Originated | Commercial Banking | Commercial loans | Pass
Credit quality indicators
Total loans	509,145,000	461,962,000
Originated | Commercial Banking | Commercial loans | Special mention
Credit quality indicators
Total loans	15,582,000	15,510,000
Originated | Commercial Banking | Commercial loans | Substandard
Credit quality indicators
Total loans	39,522,000	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	778,270,000	825,076,000
Acquired | Pass
Credit quality indicators
Total loans	725,209,000	769,795,000
Acquired | Special mention
Credit quality indicators
Total loans	7,878,000	8,625,000
Acquired | Substandard
Credit quality indicators
Total loans	45,183,000	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	442,043,000	472,024,000
Acquired | Personal Banking | Pass
Credit quality indicators
Total loans	439,595,000	468,961,000
Acquired | Personal Banking | Special mention
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Substandard
Credit quality indicators
Total loans	2,448,000	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	108,570,000	113,823,000
Acquired | Personal Banking | Residential mortgage loans | Pass
Credit quality indicators
Total loans	108,130,000	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	440,000	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	248,033,000	258,797,000
Acquired | Personal Banking | Home equity loans | Pass
Credit quality indicators
Total loans	246,562,000	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	1,471,000	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	85,440,000	99,404,000
Acquired | Personal Banking | Consumer loans | Pass
Credit quality indicators
Total loans	84,903,000	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	537,000	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	336,227,000	353,052,000
Acquired | Commercial Banking | Pass
Credit quality indicators
Total loans	285,614,000	300,834,000
Acquired | Commercial Banking | Special mention
Credit quality indicators
Total loans	7,878,000	8,625,000
Acquired | Commercial Banking | Substandard
Credit quality indicators
Total loans	42,735,000	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	277,013,000	293,514,000
Acquired | Commercial Banking | Commercial real estate loans | Pass
Credit quality indicators
Total loans	237,146,000	251,761,000
Acquired | Commercial Banking | Commercial real estate loans | Special mention
Credit quality indicators
Total loans	4,313,000	4,838,000
Acquired | Commercial Banking | Commercial real estate loans | Substandard
Credit quality indicators
Total loans	35,554,000	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	59,214,000	59,538,000
Acquired | Commercial Banking | Commercial loans | Pass
Credit quality indicators
Total loans	48,468,000	49,073,000
Acquired | Commercial Banking | Commercial loans | Special mention
Credit quality indicators
Total loans	3,565,000	3,787,000
Acquired | Commercial Banking | Commercial loans | Substandard
Credit quality indicators
Total loans	7,181,000	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 Intangible52

Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Amortizable intangible assets:
Amortization expense	$ 1,520	$ 1,749
Estimated amortization expense
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
Core Deposits
Amortizable intangible assets:
Intangible asset - gross	63,685		$ 63,685
Less: accumulated amortization	(41,333)		(40,029)
Intangible asset - net	22,352		23,656
Customer and Contract
Amortizable intangible assets:
Intangible asset - gross	10,474		10,474
Less: accumulated amortization	(8,677)		(8,461)
Intangible asset - net	$ 1,797		$ 2,013

Goodwill and Other Intangible53

Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 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	Mar. 31, 2018USD ($)trust$ / sharesshares	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Number of statutory business trusts owned | trust			3
Junior subordinated deferrable interest debentures held by trusts that issued guaranteed capital debt securities			$ 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 deferrable interest debentures held by trusts that issued guaranteed capital debt securities			$ 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)			3.69%
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 deferrable interest debentures held by trusts that issued guaranteed capital debt securities			$ 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)			3.50%
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 deferrable interest debentures held by trusts that issued guaranteed capital debt securities			$ 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)			3.60%
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 150,000,000
Securities Sold under Agreements to Repurchase
Debt Instrument [Line Items]
Securities sold under agreements to repurchase			$ 104,600,000	$ 108,200,000

Guarantees (Details)

Guarantees (Details) $ in Thousands	Mar. 31, 2018USD ($)
Guarantor Obligations [Line Items]
Liability recognized for the obligations	$ 152
Letter of Credit
Guarantor Obligations [Line Items]
Maximum potential amount of future payments	23,800
Maximum exposure collateralized	$ 15,100

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stock options
Antidilutive securities excluded from the calculation of earnings per share
Average share price during the reporting period (in dollars per share)	$ 16.83	$ 17.54

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
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Reported net income	$ 24,985	$ 17,746
Weighted average common shares outstanding (in shares)	101,598,928	100,653,277
Dilutive potential shares due to effect of stock options (in shares)	1,537,569	1,827,272
Total weighted average common shares and dilutive potential shares (in shares)	103,136,497	102,480,549
Basic earnings per share (in dollars per share)	$ 0.25	$ 0.18
Diluted earnings per share (in dollars per share)	$ 0.24	$ 0.17

Pension and Other Post-retire58

Pension and Other Post-retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension benefits
Components of net periodic benefit cost
Service cost	$ 1,716	$ 1,537
Interest cost	1,678	1,737
Expected return on plan assets	(2,992)	(2,628)
Amortization of prior service cost	(581)	(581)
Amortization of the net loss	(873)	(928)
Net periodic cost	694	993
Pension benefits | Minimum
Components of net periodic benefit cost
Estimated contribution for the current year	4,000
Pension benefits | Maximum
Components of net periodic benefit cost
Estimated contribution for the current year	6,000
Other post-retirement benefits
Components of net periodic benefit cost
Service cost	0	0
Interest cost	14	18
Expected return on plan assets	0	0
Amortization of prior service cost	0	0
Amortization of the net loss	(24)	(27)
Net periodic cost	$ 38	$ 45

Disclosures About Fair Value 59

Disclosures About Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Significant unrealized appreciation or depreciation in financial instruments	$ 0	$ 0
Financial assets:
Securities available-for-sale		792,535
Securities held-to-maturity	27,324	29,667
Accrued interest receivable	23,051	23,352
Interest rate swaps	2,971	214
Financial liabilities:
Borrowed funds	104,558	108,238
Junior subordinated debentures	111,213	111,213
Cash flow hedges	3,593	1,339
Level 1
Financial assets:
Cash and cash equivalents	192,158	77,710
Securities available-for-sale	0	574
Securities held-to-maturity	0	0
Loans receivable, net	0	3,128
Accrued interest receivable	23,051	23,352
Interest rate swaps		0
FHLB Stock	0	0
Total financial assets	215,209	104,764
Financial liabilities:
Savings and checking deposits	6,564,889	6,414,366
Time deposits	0	0
Borrowed funds	104,558	108,238
Junior subordinated debentures	0	0
Accrued interest payable	528	460
Total financial liabilities	6,669,975	6,523,064
Level 2
Financial assets:
Cash and cash equivalents	0	0
Securities available-for-sale	757,976	791,961
Securities held-to-maturity	27,324	29,667
Loans receivable, net	0	0
Accrued interest receivable	0	0
Interest rate swaps		214
FHLB Stock	0	0
Total financial assets	788,271	821,842
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	3,593	1,339
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	7,677,596	7,759,434
Accrued interest receivable	0	0
Interest rate swaps		0
FHLB Stock	0	0
Total financial assets	7,677,596	7,759,434
Financial liabilities:
Savings and checking deposits	0	0
Time deposits	1,444,841	1,433,380
Borrowed funds	0	0
Junior subordinated debentures	111,670	110,954
Accrued interest payable	0	0
Total financial liabilities	1,556,511	1,544,334
Carrying amount
Financial assets:
Cash and cash equivalents	192,158	77,710
Securities available-for-sale	757,976	792,535
Securities held-to-maturity	27,709	29,678
Loans receivable, net	7,827,056	7,736,614
Accrued interest receivable	23,051	23,352
Interest rate swaps		214
FHLB Stock	7,694	11,733
Total financial assets	8,838,615	8,671,836
Financial liabilities:
Savings and checking deposits	6,564,889	6,414,366
Time deposits	1,420,600	1,412,623
Borrowed funds	104,558	108,238
Junior subordinated debentures	111,213	111,213
Accrued interest payable	528	460
Total financial liabilities	8,205,381	8,048,239
Estimated fair value
Financial assets:
Cash and cash equivalents	192,158	77,710
Securities available-for-sale	757,976	792,535
Securities held-to-maturity	27,324	29,667
Loans receivable, net	7,677,596	7,762,562
Accrued interest receivable	23,051	23,352
Interest rate swaps		214
FHLB Stock	7,694	11,733
Total financial assets	8,688,770	8,697,773
Financial liabilities:
Savings and checking deposits	6,564,889	6,414,366
Time deposits	1,444,841	1,433,380
Borrowed funds	104,558	108,238
Junior subordinated debentures	111,670	110,954
Accrued interest payable	528	460
Total financial liabilities	8,230,079	8,068,737
Foreign exchange swaps | Level 1
Financial liabilities:
Cash flow hedges	0	0
Foreign exchange swaps | Level 2
Financial liabilities:
Cash flow hedges	13	61
Foreign exchange swaps | Level 3
Financial liabilities:
Cash flow hedges	0	0
Foreign exchange swaps | Carrying amount
Financial liabilities:
Cash flow hedges	13	61
Foreign exchange swaps | Estimated fair value
Financial liabilities:
Cash flow hedges	13	61
Interest rate swaps
Financial liabilities:
Cash flow hedges	609
Interest rate swaps | Level 1
Financial assets:
Interest rate swaps	0
Financial liabilities:
Cash flow hedges	0	0
Interest rate swaps | Level 2
Financial assets:
Interest rate swaps	2,971
Financial liabilities:
Cash flow hedges	3,580	1,278
Interest rate swaps | Level 3
Financial assets:
Interest rate swaps	0
Financial liabilities:
Cash flow hedges	0	0
Interest rate swaps | Carrying amount
Financial assets:
Interest rate swaps	2,971
Financial liabilities:
Cash flow hedges	3,580	1,278
Interest rate swaps | Estimated fair value
Financial assets:
Interest rate swaps	2,971
Financial liabilities:
Cash flow hedges	$ 3,580	$ 1,278

Disclosures About Fair Value 60

Disclosures About Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities		$ 792,535
Interest rate swaps	$ 2,971	214
Cash flow hedges	3,593	1,339
Level 1
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	0	574
Interest rate swaps		0
Total financial assets	215,209	104,764
Level 2
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	757,976	791,961
Interest rate swaps		214
Total financial assets	788,271	821,842
Level 3
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	0	0
Interest rate swaps		0
Total financial assets	7,677,596	7,759,434
Measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis
Total financial assets	760,037	792,749
Total Liabilities	3,593	1,339
Measured on recurring basis | Equity securities
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	0	574
Measured on recurring basis | Debt securities
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	243,397	261,235
Measured on recurring basis | Debt securities | U.S. government and agencies
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	1	1
Measured on recurring basis | Debt securities | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	202,295	209,269
Measured on recurring basis | Debt securities | States and political subdivisions
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	41,101	51,056
Measured on recurring basis | Debt securities | Corporate
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	0	909
Measured on recurring basis | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	513,669	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:	30,605	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:	78,733	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:	61,342	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:	548	555
Measured on recurring basis | Collateralized mortgage obligations | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	4,548	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:	180,538	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:	157,354	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:	1	15
Measured on recurring basis | Interest rate swaps
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	2,971	214
Cash flow hedges	3,580	1,278
Measured on recurring basis | Foreign exchange swaps
Assets and liabilities measured at fair value on a recurring basis
Cash flow hedges	13	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
Fair value available for sale securities	0	574
Measured on recurring basis | Level 1 | Debt securities
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	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
Fair value available for sale securities	0	0
Measured on recurring basis | Level 1 | Debt securities | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	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
Fair value available for sale securities	0	0
Measured on recurring basis | Level 1 | Debt securities | Corporate
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	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
Cash flow hedges	0	0
Measured on recurring basis | Level 1 | Foreign exchange swaps
Assets and liabilities measured at fair value on a recurring basis
Cash flow hedges	0	0
Measured on recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Total financial assets	760,037	792,175
Total Liabilities	3,593	1,339
Measured on recurring basis | Level 2 | Equity securities
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	0	0
Measured on recurring basis | Level 2 | Debt securities
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	243,397	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
Fair value available for sale securities	1	1
Measured on recurring basis | Level 2 | Debt securities | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	202,295	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
Fair value available for sale securities	41,101	51,056
Measured on recurring basis | Level 2 | Debt securities | Corporate
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities		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:	513,669	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:	30,605	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:	78,733	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:	61,342	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:	548	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:	4,548	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:	180,538	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:	157,354	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:	1	15
Measured on recurring basis | Level 2 | Interest rate swaps
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	2,971	214
Cash flow hedges	3,580	1,278
Measured on recurring basis | Level 2 | Foreign exchange swaps
Assets and liabilities measured at fair value on a recurring basis
Cash flow hedges	13	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
Fair value available for sale securities	0	0
Measured on recurring basis | Level 3 | Debt securities
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	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
Fair value available for sale securities	0	0
Measured on recurring basis | Level 3 | Debt securities | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities	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
Fair value available for sale securities	0	0
Measured on recurring basis | Level 3 | Debt securities | Corporate
Assets and liabilities measured at fair value on a recurring basis
Fair value available for sale securities		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
Cash flow hedges	0	0
Measured on recurring basis | Level 3 | Foreign exchange swaps
Assets and liabilities measured at fair value on a recurring basis
Cash flow hedges	$ 0	$ 0

Disclosures About Fair Value 61

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
	Mar. 31, 2018	Mar. 31, 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	$ 9,366
Total net realized investment gains/ (losses) and net change in unrealized appreciation/ (depreciation):
Included in net income as OTTI	0	0
Included in other comprehensive income	0	511
Purchases	0	0
Sales	0	0
Transfers in to Level 3	0	0
Transfers out of Level 3	0	0
Ending balance March 31,	$ 0	$ 9,877

Disclosures About Fair Value 62

Disclosures About Fair Value of Financial Instruments - Nonrecurring Assets that had Fair Market Values Below the Carrying Amount (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	$ 32,792	$ 39,087
Loans measured for impairment
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	28,751	33,421
Real estate owned
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	4,041	5,666
Level 1
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	0	0
Level 1 | Loans measured for impairment
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	0	0
Level 1 | Real estate owned
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	0	0
Level 2
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	0	0
Level 2 | Loans measured for impairment
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	0	0
Level 2 | Real estate owned
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	0	0
Level 3
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	32,792	39,087
Level 3 | Loans measured for impairment
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	28,751	33,421
Level 3 | Real estate owned
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Total assets	$ 4,041	$ 5,666

Disclosures About Fair Value 63

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	3 Months Ended
	Mar. 31, 2018USD ($)
Loans measured for impairment
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value	$ 28,751
Estimated cost to sell	10.00%
Loans measured for impairment | Discounted cash flow | Minimum
Quantitative information for Level 3 Fair Value Measurements Assets
Discount rate	4.25%
Loans measured for impairment | Discounted cash flow | Maximum
Quantitative information for Level 3 Fair Value Measurements Assets
Discount rate	10.00%
Loans measured for impairment | Discounted cash flow | Weighted Average
Quantitative information for Level 3 Fair Value Measurements Assets
Discount rate	7.50%
Real estate owned
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value	$ 4,041
Estimated cost to sell	10.00%

Derivative Financial Instrume64

Derivative Financial Instruments - Narrative (Details)	3 Months Ended
	Mar. 31, 2018USD ($)derivative	Dec. 31, 2017USD ($)
Derivative [Line Items]
Cash flow hedges	$ 3,593,000	$ 1,339,000
Interest rate swaps
Derivative [Line Items]
Number of agreements | derivative	2
Cash pledged as collateral to the counterparty	$ 1,100,000
Cash flow hedges	$ 609,000
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)	4.61%
Trust preferred investments | Northwest Bancorp Statutory Trust IV | Interest rate swaps
Derivative [Line Items]
Original term of swaps	10 years
Fixed rate (as a percent)	4.09%
Notional amount	$ 25,000,000

Derivative Financial Instrume65

Derivative Financial Instruments - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Asset Derivatives, Notional Amount	$ 125,394	$ 92,631
Asset Derivatives, Fair Value	2,971	214
Liability Derivatives, Notional Amount	180,952	154,975
Liability Derivatives, Fair Value	3,593	1,339
Interest rate swaps
Derivative [Line Items]
Liability Derivatives, Fair Value	609
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	50,000	50,000
Liability Derivatives, Fair Value	609	1,064
Not Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Asset Derivatives, Notional Amount	125,394	92,631
Asset Derivatives, Fair Value	2,971	214
Liability Derivatives, Notional Amount	125,394	92,631
Liability Derivatives, Fair Value	2,971	214
Not Designated as Hedging Instrument | Foreign exchange swaps
Derivative [Line Items]
Asset Derivatives, Notional Amount	0	0
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Notional Amount	5,558	12,344
Liability Derivatives, Fair Value	$ 13	$ 61

Derivative Financial Instrume66

Derivative Financial Instruments - Gain (Loss) on Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Non-hedging swap derivatives:
Increase/ (decrease) in other income	$ 129	$ (34)
Hedging interest rate derivatives:
Increase in interest expense	$ 332	$ 419

Changes in Accumulated Other 67

Changes in Accumulated Other Comprehensive Income/ (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Changes in accumulated other comprehensive income by component
Balance beginning of the period	$ 1,207,724	$ 1,170,663
Reclassification due to adoption of ASU No. 2018-02	6,746
Other comprehensive income before reclassification adjustments	(3,595)	961
Amounts reclassified from accumulated other comprehensive income	200	209
Other comprehensive income/ (loss)	(10,141)	1,170
Balance end of the period	1,215,254	1,177,563
Reclassification adjustment for gains included in net income, net of tax	26	11
Reclassification adjustment for gains included in net income, tax	(7)	(8)
Reclassification adjustment for prior period service costs included in net income, net of tax	226	220
Reclassification adjustment for prior period service costs included in net income, tax	90	153
Unrealized gains and (losses) on securities available- for-sale
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(4,409)	395
Reclassification due to adoption of ASU No. 2018-02	991
Other comprehensive income before reclassification adjustments	(3,955)	658
Amounts reclassified from accumulated other comprehensive income	(26)	(11)
Other comprehensive income/ (loss)	(4,972)	647
Balance end of the period	(9,381)	1,042
Reclassification adjustment for gains included in net income, net of tax	33	19
Reclassification adjustment for gains included in net income, tax	(7)	(8)
Change in fair value of interest rate swaps
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(691)	(1,778)
Reclassification due to adoption of ASU No. 2018-02	149
Other comprehensive income before reclassification adjustments	360	303
Amounts reclassified from accumulated other comprehensive income	0	0
Other comprehensive income/ (loss)	211	303
Balance end of the period	(480)	(1,475)
Change in defined benefit pension plans
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(26,980)	(26,608)
Reclassification due to adoption of ASU No. 2018-02	5,606
Other comprehensive income before reclassification adjustments	0	0
Amounts reclassified from accumulated other comprehensive income	226	220
Other comprehensive income/ (loss)	(5,380)	220
Balance end of the period	(32,360)	(26,388)
Reclassification adjustment for prior period service costs included in net income, net of tax	581	581
Reclassification adjustment for defined benefit plan loss included in net income, net of tax	(897)	(954)
Reclassification adjustment for prior period service costs included in net income, tax	90	153
Total
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(32,080)	(27,991)
Reclassification due to adoption of ASU No. 2018-02	6,746
Balance end of the period	$ (42,221)	$ (26,821)

Revenue Recognition - Schedule

Revenue Recognition - Schedule of Sources of Non-Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Service charges and fees	$ 11,899	$ 11,717
Gain on sale of investments	153	17
Trust and other financial services income	4,031	4,304
Insurance commission income	2,749	2,794
(Loss)/ gain on real estate owned, net	(546)	(67)
Income from bank owned life insurance	990	1,068
Mortgage banking income	224	240
Other operating income	2,288	1,431
Total noninterest income	21,788	21,504
Service charges on deposits
Disaggregation of Revenue [Line Items]
Service charges and fees	4,920	5,197
Loan servicing fees
Disaggregation of Revenue [Line Items]
Service charges and fees	565	411
Interchange income
Disaggregation of Revenue [Line Items]
Service charges and fees	6,414	6,109
Excluded From Scope Of ASU 2014-09
Disaggregation of Revenue [Line Items]
Other operating income	$ 621	$ 212