Northwest Bancshares (NWBI) 10-Q 9 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document and Entity Information
Entity Registrant Name	Northwest Bancshares, Inc.
Entity Central Index Key	0001471265
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding (in shares)		106,251,814
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 92,923	$ 68,789
Marketable securities available-for-sale (amortized cost of $845,989 and $811,015)	842,657	801,450
Marketable securities held-to-maturity (fair value of $21,597 and $22,446)	21,671	22,765
Total cash and cash equivalents and marketable securities	957,251	893,004
Personal Banking:
Residential mortgage loans	2,867,161	2,864,470
Home equity loans	1,324,405	1,258,422
Consumer loans	931,062	859,713
Total Personal Banking loans	5,122,628	4,982,605
Commercial Banking:
Commercial real estate loans	2,799,309	2,471,821
Commercial loans	647,938	597,013
Total Commercial Banking loans	3,447,247	3,068,834
Total loans	8,569,875	8,051,439
Allowance for loan losses	(55,721)	(55,214)
Total loans, net	8,514,154	7,996,225
Federal Home Loan Bank stock, at cost	12,533	15,635
Accrued interest receivable	28,107	24,490
Real estate owned, net	2,345	2,498
Premises and equipment, net	149,623	143,390
Bank-owned life insurance	186,251	171,079
Goodwill	344,720	307,420
Other intangible assets	25,872	19,821
Other assets	76,232	34,211
Total assets	10,297,088	9,607,773
Liabilities:
Noninterest-bearing demand deposits	1,992,126	1,736,156
Interest-bearing demand deposits	1,583,049	1,455,460
Money market deposit accounts	1,778,806	1,661,623
Savings deposits	1,711,216	1,636,099
Time deposits	1,527,327	1,404,841
Total deposits	8,592,524	7,894,179
Borrowed funds	114,081	234,389
Junior subordinated debentures	121,757	111,213
Advances by borrowers for taxes and insurance	44,905	43,298
Accrued interest payable	1,111	744
Other liabilities	106,434	66,312
Total liabilities	8,980,812	8,350,135
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, 106,220,030 and 103,354,030 shares issued, respectively	1,062	1,034
Paid-in capital	795,044	745,926
Retained earnings	555,205	550,374
Accumulated other comprehensive loss	(35,035)	(39,696)
Total shareholders’ equity	1,316,276	1,257,638
Total liabilities and shareholders’ equity	$ 10,297,088	$ 9,607,773

CONSOLIDATED STATEMENTS OF FI_2

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Marketable securities available-for-sale, amortized cost	$ 845,989	$ 811,015
Marketable securities held-to-maturity, fair value	$ 21,597	$ 22,446
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)	106,220,030	103,354,030

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest income
Loans receivable	$ 94,935	$ 85,220
Mortgage-backed securities	3,965	3,013
Taxable investment securities	936	678
Tax-free investment securities	182	390
Federal Home Loan Bank stock dividends	171	97
Interest-earning deposits	100	135
Total interest income	100,289	89,533
Interest expense
Deposits	10,145	6,458
Borrowed funds	2,162	1,308
Total interest expense	12,307	7,766
Net interest income	87,982	81,767
Provision for loan losses	6,467	4,209
Net interest income after provision for loan losses	81,515	77,558
Noninterest income:
Gain/(loss) on sale of investments	(6)	153
Service charges and fees	12,043	11,899
Trust and other financial services income	4,195	4,031
Insurance commission income	2,178	2,749
Loss on real estate owned, net	(3)	(546)
Income from bank-owned life insurance	1,005	990
Mortgage banking income	216	224
Other operating income	2,034	2,288
Total noninterest income	21,662	21,788
Noninterest expense
Compensation and employee benefits	38,188	36,510
Premises and occupancy costs	7,218	7,307
Office operations	3,131	3,408
Collections expense	308	512
Processing expenses	10,434	9,706
Marketing expenses	1,886	2,140
Federal deposit insurance premiums	706	717
Professional services	2,524	2,277
Amortization of intangible assets	1,447	1,520
Real estate owned expense	159	292
Restructuring/acquisition expense	1,926	0
Other expenses	3,497	3,032
Total noninterest expense	71,424	67,421
Income before income taxes	31,753	31,925
Federal and state income taxes expense	6,709	6,940
Net income	$ 25,044	$ 24,985
Basic earnings per share (in dollars per share)	$ 0.24	$ 0.25
Diluted earnings per share (in dollars per share)	$ 0.24	$ 0.24

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 25,044	$ 24,985
Net unrealized holding gains/(losses) on marketable securities:
Unrealized holding gains/(losses) net of tax of $(1,781), and $1,587, respectively	4,452	(3,955)
Reclassification adjustment for gains included in net income, net of tax of $0 and $7, respectively	0	(26)
Net unrealized holding gains/(losses) on marketable securities	4,452	(3,981)
Change in fair value of interest rate swaps, net of tax of $0, and $(95), respectively	0
Change in fair value of interest rate swaps, net of tax of $0, and $(95), respectively		360
Defined benefit plan:
Reclassification adjustments for prior period service costs and net losses included in net income, net of tax of $(82) and $(90), respectively	209	226
Other comprehensive income/(loss)	4,661	(3,395)
Total comprehensive income	$ 29,705	$ 21,590

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Unrealized holding losses, tax	$ (1,781)	$ 1,587
Reclassification adjustment for gains included in net income, tax	0	7
Change in fair value of interest rate swaps. tax	0
Change in fair value of interest rate swaps, tax		(95)
Reclassification adjustments for prior period service costs and net losses included in net income, tax	$ (82)	$ (90)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Paid-in capital	Retained earnings	Accumulated other comprehensive loss
Balance beginning of the period (in shares) at Dec. 31, 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. 2016-02	(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	0	$ (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)
Balance beginning of the period (in shares) at Dec. 31, 2018		103,354,030
Balance beginning of the period at Dec. 31, 2018	1,257,638	$ 1,034	745,926	550,374	(39,696)
Comprehensive income:
Net income	25,044			25,044
Other comprehensive income, net	4,661				4,661
Total comprehensive income	29,705			25,044	4,661
Acquisition of Union Community Bank ('UCB') (in shares)		2,462,373
Acquisition of Union Community Bank (UCB)	43,288	$ 24	43,264
Exercise of stock options (in shares)		431,782
Exercise of stock options	4,658	$ 4	4,654
Stock-based compensation expense, including tax benefit	1,200		1,200
Stock-based compensation forfeited (in shares)		(28,155)
Stock-based compensation forfeited	0
Dividends paid, per share amount	(18,643)			(18,643)
Balance end of period (in shares) at Mar. 31, 2019		106,220,030
Balance end of the period at Mar. 31, 2019	$ 1,316,276	$ 1,062	$ 795,044	$ 555,205	$ (35,035)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Other comprehensive income, tax	$ (1,863)	$ 1,409
Dividends paid, per share (in dollars per share)	$ 0.18	$ 0.17

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net income	$ 25,044	$ 24,985
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	6,467	4,209
Net loss on sale of assets	810	1,009
Net depreciation, amortization and accretion	1,285	3,753
(Increase)/decrease in other assets	(41,336)	1,294
Increase/(decrease) in other liabilities	36,106	(7,364)
Net amortization on marketable securities	236	466
Noncash write-down of real estate owned	160	774
Origination of loans held for sale	0	(1,297)
Proceeds from sale of loans held for sale	0	4,501
Noncash compensation expense related to stock benefit plans	1,200	978
Net cash provided by operating activities	29,972	33,308
Investing activities:
Purchase of marketable securities available-for-sale	(20,219)	(14,250)
Proceeds from maturities and principal reductions of marketable securities held-to-maturity	1,090	1,965
Proceeds from maturities and principal reductions of marketable securities available-for-sale	31,282	37,721
Proceeds from sale of marketable securities available-for-sale	32,319	5,206
Proceeds from bank-owned life insurance	2,207	0
Loan originations	(763,848)	(723,096)
Proceeds from loan maturities and principal reductions	649,597	624,663
Net proceeds of Federal Home Loan Bank stock	3,555	4,039
Proceeds from sale of real estate owned	1,078	2,618
Sale of real estate owned for investment, net	152	152
Purchase of premises and equipment	(3,478)	(489)
Acquisitions, net of cash received	(25,833)	0
Net cash used in investing activities	(92,098)	(61,471)
Financing activities:
Increase in deposits, net	218,966	158,500
Net decrease in short-term borrowings	(120,308)	(3,680)
Increase in advances by borrowers for taxes and insurance	1,587	2,829
Cash dividends paid	(18,643)	(17,405)
Proceeds from stock options exercised	4,658	2,367
Net cash provided by financing activities	86,260	142,611
Net increase in cash and cash equivalents	24,134	114,448
Cash and cash equivalents at beginning of period	68,789	77,710
Cash and cash equivalents at end of period	92,923	192,158
Cash paid during the period for:
Interest on deposits and borrowings (including interest credited to deposit accounts of $9,364 and $6,171, respectively)	11,940	7,698
Income taxes	1,747	1,367
Business acquisitions:
Fair value of assets acquired	580,407	0
Northwest Bancshares, Inc. common stock issued	(43,288)	0
Cash paid	(42,500)	0
Liabilities assumed	494,619	0
Non-cash activities:
Loan foreclosures and repossessions	1,492	2,396
Sale of real estate owned financed by the Company	$ 0	$ 183

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Cash Flows [Abstract]
Interest on deposits and borrowings, interest credited to deposit accounts	$ 9,364	$ 6,171

Basis of Presentation and Infor

Basis of Presentation and Informational Disclosures	3 Months Ended
	Mar. 31, 2019
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 182 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 (doing business as Northwest Insurance Services). 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, 2018 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, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019 , or any other period. Stock-Based Compensation Stock-based compensation expense of $1.2 million and $978,000 for the quarters ended March 31, 2019 and 2018 , respectively, was recognized in compensation expense relating to our stock benefit plans. At March 31, 2019 , there was compensation expense of $3.8 million to be recognized for awarded but unvested stock options and $16.6 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, 2019 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, 2018 , 2017 , 2016 and 2015 . Recent Accounting Pronouncements (a) Recently Adopted Accounting Standards In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02, Leases (Topic 842), which requires lessees to recognize leases on-balance sheet and disclose key information about leasing arrangements. Accounting Standards Codification ("ASC") Topic 842 establishes a right of use ("ROU") model that requires a lessee to recognize a ROU asset and lease liability on the balance sheet for all leases with a term longer than 12 months. Leases will be classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the income statement. The Company has elected not to recognize ROU assets and lease liabilities for short-term leases of all classes of underlying assets that have a lease term of 12 months or less and we recognize lease expense for these leases on a straight-line basis over the term of the lease. On January 1, 2019, the Company adopted ASU 2016-02 using a modified retrospective transition approach as of the effective date, January 1, 2019. As a result, the Company was not required to adjust its comparative period financial information for effects of the standard or make the new required lease disclosures for periods before the date of adoption (i.e. January 1, 2017). The Company has elected to adopt the package of transition practical expedients and, therefore, has not reassessed (1) whether existing or expired contracts contain a lease, (2) lease classification for existing or expired leases or (3) the accounting for initial direct costs that were previously capitalized. The Company also elected the practical expedient to use hindsight for leases existing at the adoption date. As a result of the adoption of ASU 2016-02, we recognized an operating lease ROU asset of $40.2 million , an operating lease liability of approximately $42.2 million and a cumulative-effect adjustment on retained earnings of $1.6 million on the consolidated statements of financial condition as of January 1, 2019, with no impact on our consolidated statement of income or consolidated statement of cash flows compared to the prior lease accounting model. (b) Recently Issued Accounting Standards In June 2016, the FASB issued ASU 2016-13, " Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments" , which eliminates the probable initial recognition threshold for credit losses and instead requires that all financial assets (or group of financial assets) measured at amortized cost be presented at the net amount expected to be collected inclusive of the entity’s current estimate of all lifetime expected credit losses. This guidance also applies to certain off-balance-sheet credit exposures such as unfunded commitments and non-derivative financial guarantees. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial assets in order to present the net carrying value at the amount expected to be collected on the financial asset. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The income statement under this guidance will reflect the initial recognition of current expected credit losses for newly recognized assets, as well as any increases or decreases of expected credit losses that have occurred during the period. This guidance retains many currently-existing disclosures related to the credit quality of an entity’s assets and the related allowance for credit losses amended to reflect the change to an expected credit loss methodology, as well as enhanced disclosures to provide information to users at a more disaggregated level. Upon adoption, ASU 2016-13 provides for a modified retrospective transition by means of a cumulative-effect adjustment to equity as of the beginning of the period in which the guidance is effective, except for debt securities for which other-than-temporary impairment has previously been recognized. For these debt securities, a prospective transition is provided in order to maintain the same amortized cost prior to and subsequent to the effective date of the ASU. This guidance is effective for annual reporting periods beginning after December 15, 2019, and interim periods within those annual periods with early adoption permitted for fiscal years beginning after December 15, 2018, and interim periods within those annual periods. Management has created a formal working group to govern the implementation of these amendments, consisting of key stakeholders from finance, risk, credit and accounting. We are currently in the process of designing current expected credit loss estimation methodologies and systems, and collecting data to be able to comply with the standard. We have engaged with a third party to assist in the development of certain portfolio-level estimation methodologies and have chosen a third-party software platform provider. We are also evaluating the effect this guidance will have on our results of operations, financial position and related disclosures. The impact of the ASU will depend upon the state of the economy and the nature of our portfolios, among other items, at the date of adoption. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820) - Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement.” This guidance removes, modifies and adds disclosure requirements for fair value measurements. This guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those years, with early adoption permitted for any removed or modified disclosure requirements. Transition is on a prospective basis for the new and modified disclosures, and on a retrospective basis for disclosures that have been eliminated. We do not expect this guidance to have a material impact on our financial statements. In August 2018, the FASB issued ASU 2018-14, “ Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20) - Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans.” This guidance removes and adds disclosure requirements for defined benefit pension or other post-retirement plans. This guidance is effective for annual periods beginning after December 15, 2020, with early adoption permitted, and requires retrospective adoption for all periods presented. We do not expect this guidance to have a material impact on our financial statements. In August 2018, the FASB issued ASU 2018-15, “ Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” This guidance aligns the requirements for capitalization of implementation costs incurred in a hosting arrangement that is a service contract with the existing guidance for internal-use software. This guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those years, with early adoption permitted. Transition can either be on a retrospective basis or a prospective basis on all implementation costs incurred after the date of adoption. We are evaluating the impact this new accounting guidance will have on our financial statements.

Acquisition

Acquisition	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Acquisition	Acquisition On March 8, 2019, the Company completed the merger with Donegal Financial Services Corporation ("DFSC"), the holding company for Union Community Bank ("UCB"), for total consideration of $85.8 million . The transaction has expanded Northwest’s franchise by 12 offices in Lancaster County in eastern Pennsylvania. The result of UCB's operations are included in the Consolidated Statements of Income from the date of acquisition. Under the terms of the merger agreement, the two shareholders of DFSC, Donegal Mutual Insurance Company and Donegal Group Inc., received payment in the form of 50% cash and 50% stock, or a total of $42.5 million and 2,462,373 shares of common stock of the Company, valued at $43.3 million , based on the $17.58 closing price of the Company's stock on March 8, 2019. The following table shows the assets acquired and the liabilities assumed that were recorded at fair value on the date of acquisition (in thousands): Consideration paid: Northwest Bancshares, Inc. common stock issued $ 43,288 Cash paid to DFSC 42,500 Total consideration paid 85,788 Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value (1) Cash and cash equivalents $ 16,667 Investment securities available-for-sale 78,594 Loans 407,840 Federal Home Loan Bank stock 453 Premises and equipment 6,520 Core deposit intangible 7,498 Other assets 25,535 Deposits (479,379 ) Other liabilities (15,240 ) Total identifiable net assets $ 48,488 Goodwill $ 37,300 (1) Amounts are estimates and subject to adjustment. Actual amounts are not expected to differ materially from the amounts shown. We estimated the fair value of loans acquired from UCB by utilizing a methodology wherein similar loans were aggregated into pools. Cash flows for each pool were determined by estimating future credit losses and the rate of prepayments. Projected monthly cash flows were then discounted to present value based on a market rate for similar loans. There was no carryover of UCB’s allowance for loan losses associated with the loans we acquired as the loans were initially recorded at fair value. Loans acquired with evidence of credit quality deterioration were evaluated and not considered to be significant. The core deposit intangible asset recognized as part of the UCB merger is being amortized over its estimated useful life of approximately seven years utilizing an accelerated method. The goodwill, which is not amortized for book purposes, was assigned to our Community Banking segment and is not deductible for tax purposes. The fair values of savings and transaction deposit accounts acquired from UCB were assumed to approximate the carrying value as these accounts have no stated maturity and are payable on demand. Certificates of deposit were valued by projecting out the expected cash flows based on the contractual terms of the certificates of deposit. These cash flows were discounted based on a market rate for a certificate of deposit with a corresponding maturity. Direct costs related to the UCB merger were expensed as incurred and were $1.9 million during the three months ended March 31, 2019, which includes technology and communications costs, professional services, marketing and advertising, and other noninterest expenses.

Leases

Leases	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases	Leases At inception, the Company determines if an arrangement contains a lease and whether that lease meets the classification of a finance or operating lease. Operating lease ROU assets represent our right to use an underlying asset during the lease term and operating lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and operating lease liabilities are recognized at lease commencement based on the present value of the remaining lease payments. ROU assets are further adjusted for lease incentives and initial direct costs. The Company has operating leases for certain branch and office facilities or land with lease terms up to 35 years . These leases generally contain renewal options for periods ranging from one to ten years . These options are included in the lease term when it is reasonably certain that the options will be exercised. Some of the Company’s lease arrangements contain lease components (e.g., minimum rent payments) and non-lease components (e.g., common area maintenance, taxes, etc.). The Company elected the option of not separating lease and non-lease components and instead we account for them as a single lease component. Certain lease agreements include rental payments that are adjusted periodically for an index or rate. The leases are initially measured using the projected adjustment for the index or rate in effect at the commencement date. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. Generally, the Company cannot practically determine the interest rate implicit in the lease. Therefore, the Company uses its incremental borrowing rate as the discount rate for the lease. The Company’s incremental borrowing rate for a lease is the rate of interest it would have to pay on a collateralized basis to borrow an amount equal to the lease payments under similar terms. Lease expense for these leases is recognized on a straight-line basis over the lease term, with variable lease payments recognized in the period those payments are incurred. The components of lease cost recognized within our consolidated statements of income were as follows (in thousands): For the quarter ended March 31, 2019 Operating lease costs (office operations) $ 1,299 Variable lease costs (office operations) 134 Total operating lease costs $ 1,433 Amounts reported in the consolidated statements of financial condition were as follows: Operating leases: For the quarter ended March 31, 2019 Operating lease ROU assets (other assets) $ 43,479 Operating lease liabilities (other liabilities) 46,147 Other information related to leases as of March 31, 2019 was as follows: Supplemental cash flow information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flow from operating leases $ 1,441 ROU assets obtained in exchange for lease obligations $ 4,126 Weighted average remaining lease term 15.5 years Weighted average discount rate 3.8 % Amounts disclosed for ROU assets obtained in exchange for lease obligations include amounts added to the carrying amount of ROU assets resulting from lease modifications and reassessments. Maturities of lease liabilities by fiscal year for our operating leases are as follows (in thousands): As of March 31, 2019 2019 $ 4,112 2020 4,940 2021 4,604 2022 4,297 2023 4,035 Thereafter 40,973 Total lease payments 62,961 Less amount of lease payments representing interest 16,814 Total present value of lease payments $ 46,147 As of December 31, 2018 2019 $ 4,677 2020 3,884 2021 3,179 2022 2,465 2023 2,040 Thereafter 7,784 Total lease payments $ 24,029 The Company has an additional operating lease with undiscounted payments of $ 3.4 million which has not commenced as of March 31, 2019 , and as such, has not been recognized in the Company’s consolidated statement of financial condition. We anticipate this lease to commence during 2019 .

Investment securities and impai

Investment securities and impairment of investment securities	3 Months Ended
	Mar. 31, 2019
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, 2019 (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 $ 14,804 44 — 14,848 Debt issued by government sponsored enterprises: Due in one year or less 85,092 — (457 ) 84,635 Due in one year through five years 101,060 204 (1,104 ) 100,160 Due in five years through ten years 987 15 — 1,002 Due after ten years 3,295 — (132 ) 3,163 Municipal securities: Due in one year or less 974 2 — 976 Due in one year through five years 3,990 73 — 4,063 Due in five years through ten years 12,086 100 — 12,186 Due after ten years 14,716 87 — 14,803 Corporate debt issues: Due in one year or less 41 — — 41 Due in five years through ten years 915 — — 915 Residential mortgage-backed securities: Fixed rate pass-through 154,338 1,224 (2,585 ) 152,977 Variable rate pass-through 22,782 899 (6 ) 23,675 Fixed rate agency CMOs 368,622 1,958 (3,680 ) 366,900 Variable rate agency CMOs 62,287 198 (172 ) 62,313 Total residential mortgage-backed securities 608,029 4,279 (6,443 ) 605,865 Total marketable securities available-for-sale $ 845,989 4,804 (8,136 ) 842,657 The following table shows the portfolio of investment securities available-for-sale at December 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 through five years $ 14,756 24 — 14,780 Debt issued by government sponsored enterprises: Due in one year or less 85,089 — (795 ) 84,294 Due in one year through five years 101,078 71 (1,512 ) 99,637 Due after ten years 3,546 — (142 ) 3,404 Municipal securities: Due in one year or less 1,333 2 (6 ) 1,329 Due in one year through five years 3,985 54 (4 ) 4,035 Due in five years through ten years 10,603 60 — 10,663 Due after ten years 5,105 31 — 5,136 Corporate debt issues: Due in five years through ten years 914 — — 914 Residential mortgage-backed securities: Fixed rate pass-through 130,172 568 (4,113 ) 126,627 Variable rate pass-through 24,761 1,003 (5 ) 25,759 Fixed rate agency CMOs 365,427 865 (5,921 ) 360,371 Variable rate agency CMOs 64,246 280 (25 ) 64,501 Total residential mortgage-backed securities 584,606 2,716 (10,064 ) 577,258 Total marketable securities available-for-sale $ 811,015 2,958 (12,523 ) 801,450 The following table shows the portfolio of investment securities held-to-maturity at March 31, 2019 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through $ 2,734 81 — 2,815 Variable rate pass-through 1,588 42 — 1,630 Fixed rate agency CMOs 16,698 6 (213 ) 16,491 Variable rate agency CMOs 651 10 — 661 Total residential mortgage-backed securities 21,671 139 (213 ) 21,597 Total marketable securities held-to-maturity $ 21,671 139 (213 ) 21,597 The following table shows the portfolio of investment securities held-to-maturity at December 31, 2018 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through $ 2,896 53 — 2,949 Variable rate pass-through 1,666 39 — 1,705 Fixed rate agency CMOs 17,552 — (422 ) 17,130 Variable rate agency CMOs 651 11 — 662 Total residential mortgage-backed securities 22,765 103 (422 ) 22,446 Total marketable securities held-to-maturity $ 22,765 103 (422 ) 22,446 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, 2019 (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 $ — — 136,932 (1,692 ) 136,932 (1,692 ) Residential mortgage-backed securities - agency 31,340 (165 ) 322,681 (6,492 ) 354,021 (6,657 ) Total temporarily impaired securities $ 31,340 (165 ) 459,613 (8,184 ) 490,953 (8,349 ) 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, 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 $ — — 136,425 (2,449 ) 136,425 (2,449 ) Municipal securities 929 (1 ) 1,709 (10 ) 2,638 (11 ) Residential mortgage-backed securities - agency 34,031 (30 ) 346,675 (10,456 ) 380,706 (10,486 ) Total temporarily impaired securities $ 34,960 (31 ) 484,809 (12,915 ) 519,769 (12,946 ) 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 (in thousands): 2019 2018 Beginning balance at January 1, (1) $ — 352 Credit losses on debt securities for which other-than-temporary impairment was not previously recognized — — Reduction for losses realized during the quarter — — 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, $ — — (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, 2019
Receivables [Abstract]
Loans receivable	Loans receivable The following table shows a summary of our loans receivable at March 31, 2019 and December 31, 2018 (in thousands): March 31, 2019 December 31, 2018 Originated Acquired Total Originated Acquired Total Personal Banking: Residential mortgage loans (1) $ 2,763,192 96,319 2,859,511 2,766,430 93,782 2,860,212 Home equity loans 1,035,189 289,216 1,324,405 1,043,878 214,544 1,258,422 Consumer finance loans (2) 2,292 — 2,292 3,817 — 3,817 Consumer loans 852,608 51,520 904,128 775,378 58,671 834,049 Total Personal Banking 4,653,281 437,055 5,090,336 4,589,503 366,997 4,956,500 Commercial Banking: Commercial real estate loans 2,443,717 507,294 2,951,011 2,416,047 223,327 2,639,374 Commercial loans 634,417 68,599 703,016 612,962 48,816 661,778 Total Commercial Banking 3,078,134 575,893 3,654,027 3,029,009 272,143 3,301,152 Total loans receivable, gross 7,731,415 1,012,948 8,744,363 7,618,512 639,140 8,257,652 Deferred loan costs 40,043 689 40,732 36,820 798 37,618 Allowance for loan losses (51,711 ) (4,010 ) (55,721 ) (51,751 ) (3,463 ) (55,214 ) Undisbursed loan proceeds: Residential mortgage loans (8,440 ) — (8,440 ) (11,513 ) — (11,513 ) Commercial real estate loans (138,241 ) (13,461 ) (151,702 ) (167,029 ) (524 ) (167,553 ) Commercial loans (53,918 ) (1,160 ) (55,078 ) (63,605 ) (1,160 ) (64,765 ) Total loans receivable, net $ 7,519,148 995,006 8,514,154 7,361,434 634,791 7,996,225 (1) There were no loans held for sale at March 31, 2019 and December 31, 2018 . (2) Represents loans from our consumer finance subsidiary that was closed in 2017. Such loans are no longer being originated. Acquired loans were initially measured at fair value and subsequently accounted for under either 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, 2019 December 31, 2018 Acquired loans evaluated individually for future credit losses: Outstanding principal balance $ 8,068 8,189 Carrying value 5,607 5,690 Acquired loans evaluated collectively for future credit losses: Outstanding principal balance 1,005,356 637,170 Carrying value 993,409 632,564 Total acquired loans: Outstanding principal balance 1,013,424 645,359 Carrying value 999,016 638,254 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, 2017 $ 1,540 Accretion (785 ) Net reclassification from nonaccretable yield — Balance at December 31, 2018 755 Accretion (132 ) Net reclassification from nonaccretable yield — Balance at March 31, 2019 $ 623 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, 2019 (in thousands): Carrying value Outstanding principal balance Related impairment reserve Average recorded investment in impaired loans Interest income recognized Personal Banking: Residential mortgage loans $ 975 1,579 6 982 32 Home equity loans 997 1,960 7 1,003 28 Consumer loans 17 36 4 24 3 Total Personal Banking 1,989 3,575 17 2,009 63 Commercial Banking: Commercial real estate loans 3,539 4,408 1 3,561 67 Commercial loans 79 85 — 79 2 Total Commercial Banking 3,618 4,493 1 3,640 69 Total $ 5,607 8,068 18 5,649 132 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, 2018 (in thousands): Carrying Outstanding Related Average Interest Personal Banking: Residential mortgage loans $ 990 1,598 6 1,294 226 Home equity loans 1,008 1,959 7 1,483 157 Consumer loans 29 76 4 53 35 Total Personal Banking 2,027 3,633 17 2,830 418 Commercial Banking: Commercial real estate loans 3,584 4,471 1 4,028 358 Commercial loans 79 85 — 82 9 Total Commercial Banking 3,663 4,556 1 4,110 367 Total $ 5,690 8,189 18 6,940 785 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, 2019 (in thousands): Balance as of Current period provision Charge-offs Recoveries Balance as of Originated loans: Personal Banking: Residential mortgage loans $ 4,005 186 (349 ) 114 4,054 Home equity loans 3,062 (35 ) (112 ) 25 3,184 Consumer finance loans 405 (229 ) (179 ) 137 676 Consumer loans 11,130 3,051 (2,809 ) 484 10,404 Total Personal Banking 18,602 2,973 (3,449 ) 760 18,318 Commercial Banking: Commercial real estate loans 25,470 (464 ) (569 ) 124 26,379 Commercial loans 7,639 874 (457 ) 168 7,054 Total Commercial Banking 33,109 410 (1,026 ) 292 33,433 Total originated loans 51,711 3,383 (4,475 ) 1,052 51,751 Acquired loans: Personal Banking: Residential mortgage loans 92 8 (8 ) 9 83 Home equity loans 399 45 (42 ) 48 348 Consumer loans 454 34 (32 ) 33 419 Total Personal Banking 945 87 (82 ) 90 850 Commercial Banking: Commercial real estate loans 2,467 255 (35 ) 251 1,996 Commercial loans 598 2,742 (2,813 ) 52 617 Total Commercial Banking 3,065 2,997 (2,848 ) 303 2,613 Total acquired loans 4,010 3,084 (2,930 ) 393 3,463 Total $ 55,721 6,467 (7,405 ) 1,445 55,214 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 as of Current period provision Charge-offs Recoveries Balance as of December 31, 2017 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 loan portfolio by portfolio segment and by class of financing receivable at March 31, 2019 (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 $ 2,867,161 4,097 13,052 — 7,517 813 — Home equity loans 1,324,405 3,462 7,299 166 2,125 510 31 Consumer finance loans 2,292 405 — — — — — Consumer loans 928,770 11,583 4,128 — — — — Total Personal Banking 5,122,628 19,547 24,479 166 9,642 1,323 31 Commercial Banking: Commercial real estate loans 2,799,309 27,937 41,278 — 19,372 1,568 491 Commercial loans 647,938 8,237 7,022 — 3,798 330 6 Total Commercial Banking 3,447,247 36,174 48,300 — 23,170 1,898 497 Total $ 8,569,875 55,721 72,779 166 32,812 3,221 528 (1) Includes $15.0 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, 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 $ 2,864,470 4,137 15,848 — 5,382 993 — Home equity loans 1,258,422 3,532 7,075 136 4,502 1,520 4 Consumer finance loans 3,817 676 22 3 — — — Consumer loans 855,896 10,823 4,300 27 — — — Total Personal Banking 4,982,605 19,168 27,245 166 9,884 2,513 4 Commercial Banking: Commercial real estate loans 2,471,821 28,375 36,935 — 19,859 313 310 Commercial loans 597,013 7,671 8,101 — 3,865 263 74 Total Commercial Banking 3,068,834 36,046 45,036 — 23,724 576 384 Total $ 8,051,439 55,214 72,281 166 33,608 3,089 388 (1) Includes $15.3 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, 2019 (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 $ 10,781 2,271 505 6,318 19,875 19,696 258 Home equity loans 5,542 1,757 — 1,780 9,079 8,698 166 Consumer loans 3,215 913 — — 4,128 3,992 92 Total Personal Banking 19,538 4,941 505 8,098 33,082 32,386 516 Commercial Banking: Commercial real estate loans 24,528 16,750 3,390 7,460 52,128 48,887 486 Commercial loans 2,027 4,995 232 2,303 9,557 8,877 111 Total Commercial Banking 26,555 21,745 3,622 9,763 61,685 57,764 597 Total $ 46,093 26,686 4,127 17,861 94,767 90,150 1,113 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, 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 $ 12,965 2,883 — 6,660 22,508 20,733 910 Home equity loans 5,996 1,079 — 1,818 8,893 9,075 511 Consumer finance loans 22 — — — 22 24 — Consumer loans 3,228 1,072 — — 4,300 3,992 235 Total Personal Banking 22,211 5,034 — 8,478 35,723 33,824 1,656 Commercial Banking: Commercial real estate loans 25,509 11,426 8,549 4,435 49,919 41,328 1,599 Commercial loans 3,010 5,091 2,453 2,087 12,641 9,186 507 Total Commercial Banking 28,519 16,517 11,002 6,522 62,560 50,514 2,106 Total $ 50,730 21,551 11,002 15,000 98,283 84,338 3,762 At March 31, 2019 , 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, 2019 (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 $ 2,859,252 7,909 7,909 813 — Home equity loans 1,322,279 2,126 2,126 510 — Consumer finance loans 2,292 — — — — Consumer loans 928,747 23 23 6 — Total Personal Banking 5,112,570 10,058 10,058 1,329 — Commercial Banking: Commercial real estate loans 2,764,907 34,402 31,264 6,249 3,138 Commercial loans 640,264 7,674 6,399 746 1,275 Total Commercial Banking 3,405,171 42,076 37,663 6,995 4,413 Total $ 8,517,741 52,134 47,721 8,324 4,413 The following table provides information related to the evaluation of impaired loans by portfolio segment and by class of financing receivable at December 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 $ 2,856,359 8,111 8,111 747 — Home equity loans 1,256,255 2,167 2,167 523 — Consumer finance loans 3,817 — — — — Consumer loans 855,867 29 29 6 — Total Personal Banking 4,972,298 10,307 10,307 1,276 — Commercial Banking: Commercial real estate loans 2,436,605 35,216 31,830 6,499 3,386 Commercial loans 588,932 8,081 6,738 767 1,343 Total Commercial Banking 3,025,537 43,297 38,568 7,266 4,729 Total $ 7,997,835 53,604 48,875 8,542 4,729 Our loan portfolios include loans that have been modified in a troubled debt restructuring ("TDR"), where concessions have been granted to borrowers who have experienced financial difficulties. These concessions typically result from our loss mitigation activities and could include: extending the note’s maturity date, permitting interest only payments, reducing the interest rate to a rate lower than current market rates for new debt with similar risk, reducing the principal payment, principal forbearance or other actions. These concessions are applicable to all loan segments and classes. Certain TDRs are classified as nonperforming at the time of restructuring and may be returned to performing status after considering the borrower’s sustained repayment performance for a period of at least nine months. When we modify loans in a TDR, we evaluate any possible impairment similar to other impaired loans based on the present value of expected future cash flows, discounted at the contractual interest rate of the original loan agreement, the loan’s observable market price or the current fair value of the collateral, less selling costs, for collateral dependent loans. If we determine that the value of the modified loan is less than the recorded investment in the loan (net of previous charge-offs, deferred loan fees or costs and unamortized premiums or discounts), impairment is recognized through an allowance estimate or a charge-off to the allowance. In periods subsequent to modification, we evaluate all TDRs, including those that have payment defaults, for possible impairment in accordance with ASC 310-10. As a result, loans modified in a TDR may have the financial effect of increasing the specific allowance associated with the loan. Loans modified in a TDR are closely monitored for delinquency as an early indicator of possible future default. If loans modified in a TDR subsequently default, we evaluate the loan for possible further impairment. The allowance may be increased, adjustments may be made in the allocation of the allowance, partial charge-offs may be taken to further write-down the carrying value of the loan, or the loan may be charged-off completely. The following table provides a roll forward of troubled debt restructurings for the periods indicated (dollars in thousands): For the quarter ended March 31, 2019 2018 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 195 $ 33,608 205 $ 32,104 New TDRs — — 9 4,935 Re-modified TDRs — — — — Net paydowns (796 ) (947 ) Charge-offs: Residential mortgage loans — — 1 (135 ) Home equity loans — — — — Commercial real estate loans — — 1 (203 ) Commercial loans — — 1 (721 ) Paid-off loans: Residential mortgage loans — — 1 (249 ) Home equity loans — — 1 (12 ) Commercial real estate loans — — 4 (1,574 ) Commercial loans — — 5 (2,232 ) Ending TDR balance: 195 $ 32,812 200 $ 30,966 Accruing TDRs $ 17,861 $ 19,749 Non-accrual TDRs 14,951 11,217 During the quarter ended March 31, 2019 , there were no new TDRs. Additionally, no TDRs modified within the previous twelve months of March 31, 2019 have subsequently defaulted. The following tables provide information related to troubled debt restructurings (including re-modified TDRs) by portfolio segment and by class of financing receivable during the period indicated (dollars in thousands): For the quarter ended March 31, 2018 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 of March 31, 2018 subsequently defaulted. The following table provides information as of March 31, 2018 for troubled debt restructurings (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended 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 No TDRs were re-modified during the quarters ended March 31, 2018 and March 31, 2019 . The following table provides information related to loan payment delinquencies at March 31, 2019 (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 $ 25,013 2,427 9,332 36,772 2,734,070 2,770,842 — Home equity loans 6,440 1,880 4,263 12,583 1,022,606 1,035,189 — Consumer finance loans 295 47 — 342 1,950 2,292 — Consumer loans 7,032 2,021 3,001 12,054 864,507 876,561 — Total Personal Banking 38,780 6,375 16,596 61,751 4,623,133 4,684,884 — Commercial Banking: Commercial real estate loans 28,064 859 21,205 50,128 2,255,348 2,305,476 — Commercial loans 2,318 117 1,525 3,960 576,539 580,499 — Total Commercial Banking 30,382 976 22,730 54,088 2,831,887 2,885,975 — Total originated loans 69,162 7,351 39,326 115,839 7,455,020 7,570,859 — Acquired loans: Personal Banking: Residential mortgage loans 2,996 175 1,469 4,640 91,679 96,319 20 Home equity loans 1,186 664 1,279 3,129 286,087 289,216 — Consumer loans 196 109 220 525 51,684 52,209 6 Total Personal Banking 4,378 948 2,968 8,294 429,450 437,744 26 Commercial Banking: Commercial real estate loans 901 3,205 3,384 7,490 486,343 493,833 61 Commercial loans 1,041 621 502 2,164 65,275 67,439 — Total Commercial Banking 1,942 3,826 3,886 9,654 551,618 561,272 61 Total acquired loans 6,320 4,774 6,854 17,948 981,068 999,016 87 Total loans $ 75,482 12,125 46,180 133,787 8,436,088 8,569,875 87 (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, 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 Originated loans: Personal Banking: Residential mortgage loans $ 27,245 5,732 11,668 44,645 2,714,474 2,759,119 — Home equity loans 6,810 1,771 4,825 13,406 1,030,472 1,043,878 — Consumer finance loans 661 172 21 854 2,963 3,817 — Consumer loans 9,000 2,867 3,037 14,904 793,092 807,996 — Total Personal Banking 43,716 10,542 19,551 73,809 4,541,001 4,614,810 — Commercial Banking: Commercial real estate loans 5,391 4,801 21,721 31,913 2,217,105 2,249,018 — Commercial loans 609 560 2,714 3,883 545,474 549,357 — Total Commercial Banking 6,000 5,361 24,435 35,796 2,762,579 2,798,375 — Total originated loan 49,716 15,903 43,986 109,605 7,303,580 7,413,185 — Acquired loans: Personal Banking: Residential mortgage loans 532 693 1,317 2,542 91,240 93,782 19 Home equity loans 1,839 294 1,212 3,345 211,199 214,544 40 Consumer loans 447 175 196 818 58,651 59,469 6 Total Personal Banking 2,818 1,162 2,725 6,705 361,090 367,795 65 Commercial Banking: Commercial real estate loans 112 586 3,866 4,564 218,239 222,803 78 Commercial loans 364 — 296 660 46,996 47,656 — Total Commercial Banking 476 586 4,162 5,224 265,235 270,459 78 Total acquired loan 3,294 1,748 6,887 11,929 626,325 638,254 143 Total $ 53,010 17,651 50,873 121,534 7,929,905 8,051,439 143 (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 three months ended March 31, 2019 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans: Personal Banking: Residential mortgage loans $ 2,762,876 — 7,966 — — 2,770,842 Home equity loans 1,029,941 — 5,248 — — 1,035,189 Consumer finance loans 2,292 — — — — 2,292 Consumer loans 872,778 — 3,783 — — 876,561 Total Personal Banking 4,667,887 — 16,997 — — 4,684,884 Commercial Banking: Commercial real estate loans 2,113,010 84,164 108,302 — — 2,305,476 Commercial loans 513,805 34,096 32,598 — — 580,499 Total Commercial Banking 2,626,815 118,260 140,900 — — 2,885,975 Total originated loans 7,294,702 118,260 157,897 — — 7,570,859 Acquired loans: Personal Banking: Residential mortgage loans 95,131 — 1,188 — — 96,319 Home equity loans 287,382 — 1,834 — — 289,216 Consumer loans 51,762 — 447 — — 52,209 Total Personal Banking 434,275 — 3,469 — — 437,744 Commercial Banking: Commercial real estate loans 464,166 2,889 26,778 — — 493,833 Commercial loans 59,355 514 7,570 — — 67,439 Total Commercial Banking 523,521 3,403 34,348 — — 561,272 Total acquired loans 957,796 3,403 37,817 — — 999,016 Total loans $ 8,252,498 121,663 195,714 — — 8,569,875 The following table sets forth information about credit quality indicators, which were updated during the year ended December 31, 2018 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans: Personal Banking: Residential mortgage loans $ 2,749,266 — 9,853 — — 2,759,119 Home equity loans 1,038,245 — 5,633 — — 1,043,878 Consumer finance loans 3,817 — — — — 3,817 Consumer loans 804,075 — 3,921 — — 807,996 Total Personal Banking 4,595,403 — 19,407 — — 4,614,810 Commercial Banking: Commercial real estate loans 2,062,728 91,142 95,148 — — 2,249,018 Commercial loans 503,665 15,760 29,932 — — 549,357 Total Commercial Banking 2,566,393 106,902 125,080 — — 2,798,375 Total originated loans 7,161,796 106,902 144,487 — — 7,413,185 Acquired loans: Personal Banking: Residential mortgage loans 92,625 — 1,157 — — 93,782 Home equity loans 213,273 — 1,271 — — 214,544 Consumer loans 58,954 — 515 — — 59,469 Total Personal Banking 364,852 — 2,943 — — 367,795 Commercial Banking: Commercial real estate loans 191,622 3,546 27,635 — — 222,803 Commercial loans 35,397 3,521 8,738 — — 47,656 Total Commercial Banking 227,019 7,067 36,373 — — 270,459 Total acquired loans 591,871 7,067 39,316 — — 638,254 Total $ 7,753,667 113,969 183,803 — — 8,051,439

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2019
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, 2019 December 31, 2018 Amortizable intangible assets: Core deposit intangibles - gross $ 63,685 63,685 Acquisitions 7,498 — Less: accumulated amortization (46,324 ) (45,027 ) Core deposit intangibles - net 24,859 18,658 Customer and Contract intangible assets - gross 10,474 10,474 Less: accumulated amortization (9,461 ) (9,311 ) Customer and Contract intangible assets - net $ 1,013 1,163 The following table shows the actual aggregate amortization expense for the quarters ended March 31, 2019 and 2018 , 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, 2019 $ 1,447 For the quarter ended March 31, 2018 1,520 For the year ending December 31, 2019 6,718 For the year ending December 31, 2020 5,535 For the year ending December 31, 2021 4,438 For the year ending December 31, 2022 3,438 For the year ending December 31, 2023 2,561 For the year ending December 31, 2024 1,876 The following table provides information for the changes in the carrying amount of goodwill (in thousands): Total Balance at December 31, 2017 $ 307,420 Goodwill from acquisition — Balance at December 31, 2018 307,420 Goodwill from acquisition 37,300 Balance at March 31, 2019 $ 344,720 We performed our annual goodwill impairment test as of June 30, 2018 in accordance with ASC 350, ("Step 0"), as updated by ASU 2017-04 and concluded that goodwill was not impaired. As of March 31, 2019 , there were no events or changes in circumstances that would cause us to update that goodwill impairment test.

Borrowed Funds

Borrowed Funds	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Borrowed Funds	Borrowed Funds (a) Borrowings Borrowings from the Federal Home Loan Bank of Pittsburgh ("FHLB"), are secured by our residential first mortgage and other qualifying loans. Certain of these borrowings are subject to restrictions or penalties in the event of prepayment. The revolving line of credit with the FHLB carries a commitment of $250.0 million . The rate is adjusted daily by the FHLB, and any borrowings on this line may be repaid at any time without penalty. At March 31, 2019 and December 31, 2018 the balance of the revolving line of credit was $16.3 million and $128.6 million , respectively. At March 31, 2019 and December 31, 2018 collateralized borrowings, due within one year, were $97.8 million , and $105.8 million , respectively. These borrowings are collateralized by cash or various securities held in safekeeping by the FHLB. (b) Trust Preferred Securities Prior to our merger with DFSC, we owned three statutory business trusts: Northwest Bancorp Capital Trust III, a Delaware statutory business trust, Northwest Bancorp Statutory Trust IV, a Connecticut statutory business trust and LNB Trust II, a Delaware statutory business trust (the Trusts). The Trusts exist solely to issue preferred securities to third parties for cash, issue common securities to the Company in exchange for capitalization of the Trusts, invest the proceeds from the sale of trust securities in an equivalent amount of debentures of the Company, and engage in other activities that are incidental to those previously listed. Northwest Bancorp Capital Trust III issued 50,000 cumulative trust preferred securities in a private transaction to a pooled investment vehicle on December 5, 2005 (liquidation value of $1,000 per preferred security or $50,000,000 ) with a stated maturity of December 30, 2035 and a floating rate of interest, which is reset quarterly, equal to three-month LIBOR plus 1.38% . Northwest Bancorp Statutory Trust IV issued 50,000 cumulative trust preferred securities in a private transaction to a pooled investment vehicle on December 15, 2005 (liquidation value of $1,000 per preferred security or $50,000,000 ) with a stated maturity of December 15, 2035 and a floating rate of interest, which is reset quarterly, equal to three-month LIBOR plus 1.38% . LNB Trust II has 7,875 cumulative trust preferred securities outstanding (liquidation value of $1,000 per preferred security or $7,875,000 ) with a stated maturity of June 15, 2037 and a floating rate of interest, which resets quarterly, equal to three-month LIBOR plus 1.48% . As the shareholders of the trust preferred securities are the primary beneficiaries of the Trusts, the Trusts are not consolidated in our financial statements. The Trusts have invested the proceeds of the offerings in junior subordinated deferrable interest debentures issued by the Company. The structure of these debentures mirrors the structure of the trust-preferred securities. Northwest Bancorp Capital Trust III holds $51,547,000 of the Company’s junior subordinated debentures due December 30, 2035 with a floating rate of interest, reset quarterly, of three-month LIBOR plus 1.38% . The rate in effect at March 31, 2019 was 3.97% . 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, 2019 was 3.99% . 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, 2019 was 4.09% . As a result of the merger with DFSC, we acquired two additional statutory business trusts: Union National Capital Trust I ("UNCT I") and Union National Capital Trust II ("UNCT II"); both are Delaware statutory business trusts. At March 31, 2019, UNCT I had 8,000 cumulative trust preferred securities outstanding (liquidation value of $1,000 per preferred security or $8,000,000 ) with a stated maturity of December 19, 2034. These securities carry a floating interest rate, which is reset quarterly, equal to three-month LIBOR plus 2.85% . At March 31, 2019, UNCT II had 3,000 cumulative trust preferred securities outstanding (liquidation value of $1,000 per preferred security or $3,000,000 ) with a stated maturity of October 14, 2034. These securities carry a floating interest rate, which is reset quarterly, equal to three-month LIBOR plus 2.0% . The Trusts have invested the proceeds of the offerings in junior subordinated deferrable interest debentures held by the Company. The structure of these debentures mirrors the structure of the trust-preferred securities. UNCT I holds $8,248,000 of junior subordinated debentures and UNCT II holds $3,093,000 of junior subordinated debentures. These subordinated debentures are the sole assets of the Trusts. 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 five years . If interest payments on the subordinated debentures are deferred, the distributions on the trust securities also are deferred. To date there have been no interest deferrals. Interest on the subordinated debentures and distributions on the trust securities is cumulative. Our obligation constitutes a full, irrevocable, and unconditional guarantee on a subordinated basis of the obligations of the trust under the preferred securities. The Trusts must redeem the preferred securities when the debentures are paid at maturity or upon an earlier redemption of the debentures to the extent the debentures are redeemed. All or part of the debentures may be redeemed at any time. Also, the debentures may be redeemed at any time if existing laws or regulations, or the interpretation or application of these laws or regulations, change causing: • the interest on the debentures to no longer be deductible by the Company for federal income tax purposes; • the trust to become subject to federal income tax or to certain other taxes or governmental charges; • the trust to register as an investment company; or • the preferred securities do not qualify as Tier I capital. We may, at any time, dissolve any of the Trusts and distribute the debentures to the trust security holders, subject to receipt of any required regulatory approval.

Guarantees

Guarantees	3 Months Ended
	Mar. 31, 2019
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, 2019 , the maximum potential amount of future payments we could be required to make under these non-recourse standby letters of credit was $39.3 million , of which $32.5 million is fully collateralized. At March 31, 2019 , we had a liability, which represents deferred income, of $287,000 related to the standby letters of credit.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2019
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, 2019 and 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 $ 17.74 and $ 16.83 , respectively. The computation of basic and diluted earnings per share follows (in thousands, except share data and per share amounts): Quarter ended March 31, 2019 2018 Reported net income $ 25,044 24,985 Weighted average common shares outstanding 103,101,789 101,598,928 Dilutive potential shares due to effect of stock options 1,394,803 1,537,569 Total weighted average common shares and dilutive potential shares 104,496,592 103,136,497 Basic earnings per share: $ 0.24 0.25 Diluted earnings per share: $ 0.24 0.24

Pension and Other Post-retireme

Pension and Other Post-retirement Benefits	3 Months Ended
	Mar. 31, 2019
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 2019 2018 2019 2018 Service cost $ 1,274 1,716 — — Interest cost 1,827 1,678 11 14 Expected return on plan assets (2,759 ) (2,992 ) — — Amortization of prior service cost (581 ) (581 ) — — Amortization of the net loss 855 873 17 24 Net periodic cost $ 616 694 28 38 We anticipate making a contribution to our defined benefit pension plan of $2.0 million to $4.0 million during the year ending December 31, 2019 .

Disclosures About Fair Value of

Disclosures About Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Disclosures About Fair Value of Financial Instruments	Disclosures About Fair Value of Financial Instruments We are required to disclose fair value information about financial instruments whether or not recognized in the consolidated statement of financial condition. Fair value information of certain financial instruments and all nonfinancial instruments is not required to be disclosed. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Company. Financial assets and liabilities recognized or disclosed at fair value on a recurring basis and certain financial assets and liabilities on a non-recurring basis are accounted for using a three-level hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. This hierarchy gives the highest priority to quoted prices with readily available independent data in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable market inputs (Level 3). When various inputs for measurement fall within different levels of the fair value hierarchy, the lowest level input that has a significant impact on fair value measurement is used. Financial assets and liabilities are categorized based upon the following characteristics or inputs to the valuation techniques: • Level 1 - Financial assets and liabilities for which inputs are observable and are obtained from reliable quoted prices for identical assets or liabilities in actively traded markets. This is the most reliable fair value measurement and includes, for example, active exchange-traded equity securities. • Level 2 - Financial assets and liabilities for which values are based on quoted prices in markets that are not active or for which values are based on similar assets or liabilities that are actively traded. Level 2 also includes pricing models in which the inputs are corroborated by market data, for example, matrix pricing. • Level 3 - Financial assets and liabilities for which values are based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. Level 3 inputs include the following: • Quotes from brokers or other external sources that are not considered binding; • Quotes from brokers or other external sources where it cannot be determined that market participants would in fact transact for the asset or liability at the quoted price; • Quotes and other information from brokers or other external sources where the inputs are not deemed observable. We are responsible for the valuation process and as part of this process may use data from outside sources in establishing fair value. We perform due diligence to understand the inputs used or how the data was calculated or derived. We also corroborate the reasonableness of external inputs in the valuation process. The carrying amounts reported in the consolidated statement of financial condition approximate fair value for the following financial instruments: cash on hand, interest-earning deposits in other institutions, federal funds sold and other short term investments, accrued interest receivable, accrued interest payable, and marketable securities available-for-sale. Marketable Securities Where available, market values are based on quoted market prices, dealer quotes, and prices obtained from independent pricing services. Debt securities - available-for-sale - Generally, debt securities are valued using pricing for similar securities, recently executed transactions and other pricing models utilizing observable inputs. The valuation for most debt securities is classified as Level 2. Securities within Level 2 include corporate bonds, municipal bonds, mortgage-backed securities and US government obligations. Equity securities - available-for-sale - Publicly traded securities valued using quoted market prices are classified as Level 1. We consider the financial condition of the issuer to determine if the securities have indicators of impairment. Debt securities - held-to-maturity - The fair value of debt securities held-to-maturity is determined in the same manner as debt securities available-for-sale. Loans Held for Investment 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. FHLB Stock Due to the restrictions placed on 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 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, 2019 and December 31, 2018 , 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, 2019 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 92,924 92,924 92,924 — — Securities available-for-sale 842,657 842,657 — 842,657 — Securities held-to-maturity 21,671 21,597 — 21,597 — Loans receivable, net 8,514,154 8,423,354 — — 8,423,354 Accrued interest receivable 28,107 28,107 28,107 — — Interest rate swaps 10,537 10,537 — 10,537 — FHLB stock 12,533 12,533 — — — Total financial assets $ 9,522,583 9,431,709 121,031 874,791 8,423,354 Financial liabilities: Savings and checking deposits $ 7,065,197 7,065,197 7,065,197 — — Time deposits 1,527,327 1,517,324 — — 1,517,324 Borrowed funds 114,081 114,081 114,081 — — Junior subordinated debentures 121,757 109,880 — — 109,880 Interest rate swaps 10,537 10,537 — 10,537 — Accrued interest payable 1,111 1,111 1,111 — — Total financial liabilities $ 8,840,010 8,818,130 7,180,389 10,537 1,627,204 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, 2018 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 68,789 68,789 68,789 — — Securities available-for-sale 801,450 801,450 — 801,450 — Securities held-to-maturity 22,765 22,446 — 22,446 — Loans receivable, net 7,996,225 7,845,313 — — 7,845,313 Accrued interest receivable 24,490 24,490 24,490 — — Interest rate swaps 6,445 6,445 — 6,445 — FHLB stock 15,635 15,635 — — — Total financial assets $ 8,935,799 8,784,568 93,279 830,341 7,845,313 Financial liabilities: Savings and checking accounts $ 6,489,338 6,489,338 6,489,338 — — Time deposits 1,404,841 1,434,410 — — 1,434,410 Borrowed funds 234,389 234,389 234,389 — — Junior subordinated debentures 111,213 102,572 — — 102,572 Interest rate swaps 6,445 6,445 — 6,445 — Accrued interest payable 744 744 744 — — Total financial liabilities $ 8,246,970 8,267,898 6,724,471 6,445 1,536,982 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, 2019 and December 31, 2018 . There were no transfers of financial instruments between Level 1 and Level 2 during the quarter ended March 31, 2019 . The following table represents assets and liabilities measured at fair value on a recurring basis at March 31, 2019 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Debt securities: U.S. government and agencies $ — 14,848 — 14,848 Government sponsored enterprises — 188,960 — 188,960 States and political subdivisions — 32,028 — 32,028 Corporate — 956 — 956 Total debt securities — 236,792 — 236,792 Residential mortgage-backed securities: GNMA — 26,379 — 26,379 FNMA — 90,852 — 90,852 FHLMC — 58,900 — 58,900 Non-agency — 521 — 521 Collateralized mortgage obligations: GNMA — 50,410 — 50,410 FNMA — 222,774 — 222,774 FHLMC — 156,029 — 156,029 Non-agency — — — — Total mortgage-backed securities — 605,865 — 605,865 Interest rate swaps — 10,537 — 10,537 Total assets $ — 853,194 — 853,194 Interest rate swaps $ — 10,537 — 10,537 Total liabilities $ — 10,537 — 10,537 The following table represents assets and liabilities measured at fair value on a recurring basis at December 31, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Debt securities: U.S. government and agencies $ — 14,780 — 14,780 Government sponsored enterprises — 187,335 — 187,335 States and political subdivisions — 21,163 — 21,163 Corporate — 914 — 914 Total debt securities — 224,192 — 224,192 Residential mortgage-backed securities: GNMA — 27,041 — 27,041 FNMA — 73,196 — 73,196 FHLMC — 51,621 — 51,621 Non-agency — 528 — 528 Collateralized mortgage obligations: GNMA — 52,331 52,331 FNMA — 207,033 — 207,033 FHLMC — 165,508 — 165,508 Non-agency — — — — Total mortgage-backed securities — 577,258 — 577,258 Interest rate swaps — 6,445 — 6,445 Total assets $ — 807,895 — 807,895 Interest rate swaps $ — 6,445 — 6,445 Total liabilities $ — 6,445 — 6,445 There were no assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the quarters ended March 31, 2019 and March 31, 2018 . 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, 2019 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 39,397 39,397 Real estate owned — — 2,345 2,345 Total assets $ — — 41,742 41,742 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, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 40,333 40,333 Real estate owned — — 2,498 2,498 Total assets $ — — 42,831 42,831 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 2018 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 following 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, 2019 (dollar amounts in thousands): Fair value Valuation techniques Significant unobservable inputs Range (weighted average) Loans measured for impairment $ 39,397 Appraisal value (1) Estimated cost to sell 10.0% Discounted cash flow Discount rate 4.25% to 10.0% (7.50%) Real estate owned $ 2,345 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, 2019
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 With the expiration of the $50.0 million in notional of interest rate swap agreements (swaps) previously designated in hedging relationships, we are no longer a counterparty to any interest rate swap agreements designated as cash flow hedges. Previously, the swaps were intended to protect against the variability of cash flows associated with Northwest Bancorp Capital Trust III and Northwest Bancorp Capital Trust IV. In 2018, the swaps matured without replacement. Derivatives Not Designated as Hedging Instruments We act as an interest rate or foreign exchange swap counterparty for certain commercial borrowers in the normal course of servicing our customers, which are accounted for at fair value. We manage our exposure to such interest rate or foreign exchange swaps by entering into corresponding and offsetting interest rate swaps with third parties that mirror the terms of the swaps we have with the commercial borrowers. These positions (referred to as “customer swaps”) directly offset each other and our exposure is the fair value of the derivatives due to changes in credit risk of our commercial borrowers and third parties. Customer swaps are recorded within other assets or other liabilities on the consolidated statement of financial condition at their estimated fair value. Changes to the fair value of assets and liabilities arising from these derivatives are included, net, in other operating income in the consolidated statement of income. The following table presents information regarding our derivative financial instruments for the periods indicated (in thousands): Asset derivatives Liability derivatives Notional amount Fair value Notional amount Fair value At March 31, 2019 Derivatives not designated as hedging instruments: Interest rate swap agreements $ 261,604 10,537 258,871 10,537 Total derivatives $ 261,604 10,537 258,871 10,537 At December 31, 2018 Derivatives not designated as hedging instruments: Interest rate swap agreements $ 221,919 6,445 221,919 6,445 Total derivatives $ 221,919 6,445 221,919 6,445 The following table presents income or expense recognized on derivatives for the periods indicated (in thousands): For the quarter ended March 31, 2019 2018 Hedging interest rate derivatives: Increase in interest expense $ — 332 Non-hedging swap derivatives: Increase in other income — 129

Legal Proceedings

Legal Proceedings	3 Months Ended
	Mar. 31, 2019
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, 2019 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. During the year-ended December 31, 2018, Northwest and our subsidiary, Northwest Insurance Services (“NWIS”), were involved in a lawsuit against, among others, First National Bank of Pennsylvania (“FNB”) and their insurance subsidiary, First National Insurance Agency, LLC (“FNIA”). All counterclaims against Northwest were discontinued and, on Friday, December 21, 2018, a verdict was rendered in favor of NWIS on several of its claims. Post-trial proceedings continue and, due to the inherent uncertainties with respect to these proceedings, we have not accrued any awards associated with this verdict within our consolidated financial statements as of March 31, 2019.

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income	Changes in Accumulated Other Comprehensive Income The following table shows the changes in accumulated other comprehensive income/(loss) by component for the periods indicated (in thousands): For the quarter ended March 31, 2019 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, 2018 $ (6,832 ) — (32,864 ) (39,696 ) Other comprehensive income before reclassification adjustments 4,452 — — 4,452 Amounts reclassified from accumulated other comprehensive income (1), (2) — — 209 209 Net other comprehensive income 4,452 — 209 4,661 Balance as of March 31, 2019 $ (2,380 ) — (32,655 ) (35,035 ) 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/(loss) before reclassification adjustments (3,955 ) 360 — (3,595 ) Amounts reclassified from accumulated other comprehensive income (3), (4) (26 ) — 226 200 Net other comprehensive income/(loss) (4,972 ) 211 (5,380 ) (10,141 ) Balance as of March 31, 2018 $ (9,381 ) (480 ) (32,360 ) (42,221 ) (1) There were no realized gains on securities reclassified from accumulated other comprehensive income. (2) Consists of amortization of prior service cost (compensation and employee benefits) of $581 and amortization of net loss (compensation and employee benefits) of $(872) , net of tax (income tax expense) of $82 . (3) Consists of realized gains on securities (gain on sales of investments, net) of $33 , net of tax (income tax expense) of $(7) . (4) 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 .

Basis of Presentation and Inf_2

Basis of Presentation and Informational Disclosures (Policies)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	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 182 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 (doing business as Northwest Insurance Services). 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, 2018 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.
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, 2019 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, 2018 , 2017 , 2016 and 2015 .
Recently Adopted Accounting Standards and Impact of New Accounting Standards	Recent Accounting Pronouncements (a) Recently Adopted Accounting Standards In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02, Leases (Topic 842), which requires lessees to recognize leases on-balance sheet and disclose key information about leasing arrangements. Accounting Standards Codification ("ASC") Topic 842 establishes a right of use ("ROU") model that requires a lessee to recognize a ROU asset and lease liability on the balance sheet for all leases with a term longer than 12 months. Leases will be classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the income statement. The Company has elected not to recognize ROU assets and lease liabilities for short-term leases of all classes of underlying assets that have a lease term of 12 months or less and we recognize lease expense for these leases on a straight-line basis over the term of the lease. On January 1, 2019, the Company adopted ASU 2016-02 using a modified retrospective transition approach as of the effective date, January 1, 2019. As a result, the Company was not required to adjust its comparative period financial information for effects of the standard or make the new required lease disclosures for periods before the date of adoption (i.e. January 1, 2017). The Company has elected to adopt the package of transition practical expedients and, therefore, has not reassessed (1) whether existing or expired contracts contain a lease, (2) lease classification for existing or expired leases or (3) the accounting for initial direct costs that were previously capitalized. The Company also elected the practical expedient to use hindsight for leases existing at the adoption date. As a result of the adoption of ASU 2016-02, we recognized an operating lease ROU asset of $40.2 million , an operating lease liability of approximately $42.2 million and a cumulative-effect adjustment on retained earnings of $1.6 million on the consolidated statements of financial condition as of January 1, 2019, with no impact on our consolidated statement of income or consolidated statement of cash flows compared to the prior lease accounting model. (b) Recently Issued Accounting Standards In June 2016, the FASB issued ASU 2016-13, " Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments" , which eliminates the probable initial recognition threshold for credit losses and instead requires that all financial assets (or group of financial assets) measured at amortized cost be presented at the net amount expected to be collected inclusive of the entity’s current estimate of all lifetime expected credit losses. This guidance also applies to certain off-balance-sheet credit exposures such as unfunded commitments and non-derivative financial guarantees. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial assets in order to present the net carrying value at the amount expected to be collected on the financial asset. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The income statement under this guidance will reflect the initial recognition of current expected credit losses for newly recognized assets, as well as any increases or decreases of expected credit losses that have occurred during the period. This guidance retains many currently-existing disclosures related to the credit quality of an entity’s assets and the related allowance for credit losses amended to reflect the change to an expected credit loss methodology, as well as enhanced disclosures to provide information to users at a more disaggregated level. Upon adoption, ASU 2016-13 provides for a modified retrospective transition by means of a cumulative-effect adjustment to equity as of the beginning of the period in which the guidance is effective, except for debt securities for which other-than-temporary impairment has previously been recognized. For these debt securities, a prospective transition is provided in order to maintain the same amortized cost prior to and subsequent to the effective date of the ASU. This guidance is effective for annual reporting periods beginning after December 15, 2019, and interim periods within those annual periods with early adoption permitted for fiscal years beginning after December 15, 2018, and interim periods within those annual periods. Management has created a formal working group to govern the implementation of these amendments, consisting of key stakeholders from finance, risk, credit and accounting. We are currently in the process of designing current expected credit loss estimation methodologies and systems, and collecting data to be able to comply with the standard. We have engaged with a third party to assist in the development of certain portfolio-level estimation methodologies and have chosen a third-party software platform provider. We are also evaluating the effect this guidance will have on our results of operations, financial position and related disclosures. The impact of the ASU will depend upon the state of the economy and the nature of our portfolios, among other items, at the date of adoption. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820) - Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement.” This guidance removes, modifies and adds disclosure requirements for fair value measurements. This guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those years, with early adoption permitted for any removed or modified disclosure requirements. Transition is on a prospective basis for the new and modified disclosures, and on a retrospective basis for disclosures that have been eliminated. We do not expect this guidance to have a material impact on our financial statements. In August 2018, the FASB issued ASU 2018-14, “ Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20) - Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans.” This guidance removes and adds disclosure requirements for defined benefit pension or other post-retirement plans. This guidance is effective for annual periods beginning after December 15, 2020, with early adoption permitted, and requires retrospective adoption for all periods presented. We do not expect this guidance to have a material impact on our financial statements. In August 2018, the FASB issued ASU 2018-15, “ Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” This guidance aligns the requirements for capitalization of implementation costs incurred in a hosting arrangement that is a service contract with the existing guidance for internal-use software. This guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those years, with early adoption permitted. Transition can either be on a retrospective basis or a prospective basis on all implementation costs incurred after the date of adoption. We are evaluating the impact this new accounting guidance will have on our financial statements.

Acquisition (Tables)

Acquisition (Tables)	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table shows the assets acquired and the liabilities assumed that were recorded at fair value on the date of acquisition (in thousands): Consideration paid: Northwest Bancshares, Inc. common stock issued $ 43,288 Cash paid to DFSC 42,500 Total consideration paid 85,788 Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value (1) Cash and cash equivalents $ 16,667 Investment securities available-for-sale 78,594 Loans 407,840 Federal Home Loan Bank stock 453 Premises and equipment 6,520 Core deposit intangible 7,498 Other assets 25,535 Deposits (479,379 ) Other liabilities (15,240 ) Total identifiable net assets $ 48,488 Goodwill $ 37,300 (1) Amounts are estimates and subject to adjustment. Actual amounts are not expected to differ materially from the amounts shown.

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Lease, Cost	The components of lease cost recognized within our consolidated statements of income were as follows (in thousands): For the quarter ended March 31, 2019 Operating lease costs (office operations) $ 1,299 Variable lease costs (office operations) 134 Total operating lease costs $ 1,433 Other information related to leases as of March 31, 2019 was as follows: Supplemental cash flow information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flow from operating leases $ 1,441 ROU assets obtained in exchange for lease obligations $ 4,126 Weighted average remaining lease term 15.5 years Weighted average discount rate 3.8 %
Assets And Liabilities, Lessee	Amounts reported in the consolidated statements of financial condition were as follows: Operating leases: For the quarter ended March 31, 2019 Operating lease ROU assets (other assets) $ 43,479 Operating lease liabilities (other liabilities) 46,147
Lessee, Operating Lease, Liability, Maturity	Maturities of lease liabilities by fiscal year for our operating leases are as follows (in thousands): As of March 31, 2019 2019 $ 4,112 2020 4,940 2021 4,604 2022 4,297 2023 4,035 Thereafter 40,973 Total lease payments 62,961 Less amount of lease payments representing interest 16,814 Total present value of lease payments $ 46,147
Schedule of Future Minimum Rental Payments for Operating Leases	As of December 31, 2018 2019 $ 4,677 2020 3,884 2021 3,179 2022 2,465 2023 2,040 Thereafter 7,784 Total lease payments $ 24,029

Investment securities and imp_2

Investment securities and impairment of investment securities (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 (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 $ 14,804 44 — 14,848 Debt issued by government sponsored enterprises: Due in one year or less 85,092 — (457 ) 84,635 Due in one year through five years 101,060 204 (1,104 ) 100,160 Due in five years through ten years 987 15 — 1,002 Due after ten years 3,295 — (132 ) 3,163 Municipal securities: Due in one year or less 974 2 — 976 Due in one year through five years 3,990 73 — 4,063 Due in five years through ten years 12,086 100 — 12,186 Due after ten years 14,716 87 — 14,803 Corporate debt issues: Due in one year or less 41 — — 41 Due in five years through ten years 915 — — 915 Residential mortgage-backed securities: Fixed rate pass-through 154,338 1,224 (2,585 ) 152,977 Variable rate pass-through 22,782 899 (6 ) 23,675 Fixed rate agency CMOs 368,622 1,958 (3,680 ) 366,900 Variable rate agency CMOs 62,287 198 (172 ) 62,313 Total residential mortgage-backed securities 608,029 4,279 (6,443 ) 605,865 Total marketable securities available-for-sale $ 845,989 4,804 (8,136 ) 842,657 The following table shows the portfolio of investment securities available-for-sale at December 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 through five years $ 14,756 24 — 14,780 Debt issued by government sponsored enterprises: Due in one year or less 85,089 — (795 ) 84,294 Due in one year through five years 101,078 71 (1,512 ) 99,637 Due after ten years 3,546 — (142 ) 3,404 Municipal securities: Due in one year or less 1,333 2 (6 ) 1,329 Due in one year through five years 3,985 54 (4 ) 4,035 Due in five years through ten years 10,603 60 — 10,663 Due after ten years 5,105 31 — 5,136 Corporate debt issues: Due in five years through ten years 914 — — 914 Residential mortgage-backed securities: Fixed rate pass-through 130,172 568 (4,113 ) 126,627 Variable rate pass-through 24,761 1,003 (5 ) 25,759 Fixed rate agency CMOs 365,427 865 (5,921 ) 360,371 Variable rate agency CMOs 64,246 280 (25 ) 64,501 Total residential mortgage-backed securities 584,606 2,716 (10,064 ) 577,258 Total marketable securities available-for-sale $ 811,015 2,958 (12,523 ) 801,450
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, 2019 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through $ 2,734 81 — 2,815 Variable rate pass-through 1,588 42 — 1,630 Fixed rate agency CMOs 16,698 6 (213 ) 16,491 Variable rate agency CMOs 651 10 — 661 Total residential mortgage-backed securities 21,671 139 (213 ) 21,597 Total marketable securities held-to-maturity $ 21,671 139 (213 ) 21,597 The following table shows the portfolio of investment securities held-to-maturity at December 31, 2018 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through $ 2,896 53 — 2,949 Variable rate pass-through 1,666 39 — 1,705 Fixed rate agency CMOs 17,552 — (422 ) 17,130 Variable rate agency CMOs 651 11 — 662 Total residential mortgage-backed securities 22,765 103 (422 ) 22,446 Total marketable securities held-to-maturity $ 22,765 103 (422 ) 22,446
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, 2019 (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 $ — — 136,932 (1,692 ) 136,932 (1,692 ) Residential mortgage-backed securities - agency 31,340 (165 ) 322,681 (6,492 ) 354,021 (6,657 ) Total temporarily impaired securities $ 31,340 (165 ) 459,613 (8,184 ) 490,953 (8,349 ) 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, 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 $ — — 136,425 (2,449 ) 136,425 (2,449 ) Municipal securities 929 (1 ) 1,709 (10 ) 2,638 (11 ) Residential mortgage-backed securities - agency 34,031 (30 ) 346,675 (10,456 ) 380,706 (10,486 ) Total temporarily impaired securities $ 34,960 (31 ) 484,809 (12,915 ) 519,769 (12,946 )
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 (in thousands): 2019 2018 Beginning balance at January 1, (1) $ — 352 Credit losses on debt securities for which other-than-temporary impairment was not previously recognized — — Reduction for losses realized during the quarter — — 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, $ — — (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, 2019
Receivables [Abstract]
Summary of loans receivable	The following table shows a summary of our loans receivable at March 31, 2019 and December 31, 2018 (in thousands): March 31, 2019 December 31, 2018 Originated Acquired Total Originated Acquired Total Personal Banking: Residential mortgage loans (1) $ 2,763,192 96,319 2,859,511 2,766,430 93,782 2,860,212 Home equity loans 1,035,189 289,216 1,324,405 1,043,878 214,544 1,258,422 Consumer finance loans (2) 2,292 — 2,292 3,817 — 3,817 Consumer loans 852,608 51,520 904,128 775,378 58,671 834,049 Total Personal Banking 4,653,281 437,055 5,090,336 4,589,503 366,997 4,956,500 Commercial Banking: Commercial real estate loans 2,443,717 507,294 2,951,011 2,416,047 223,327 2,639,374 Commercial loans 634,417 68,599 703,016 612,962 48,816 661,778 Total Commercial Banking 3,078,134 575,893 3,654,027 3,029,009 272,143 3,301,152 Total loans receivable, gross 7,731,415 1,012,948 8,744,363 7,618,512 639,140 8,257,652 Deferred loan costs 40,043 689 40,732 36,820 798 37,618 Allowance for loan losses (51,711 ) (4,010 ) (55,721 ) (51,751 ) (3,463 ) (55,214 ) Undisbursed loan proceeds: Residential mortgage loans (8,440 ) — (8,440 ) (11,513 ) — (11,513 ) Commercial real estate loans (138,241 ) (13,461 ) (151,702 ) (167,029 ) (524 ) (167,553 ) Commercial loans (53,918 ) (1,160 ) (55,078 ) (63,605 ) (1,160 ) (64,765 ) Total loans receivable, net $ 7,519,148 995,006 8,514,154 7,361,434 634,791 7,996,225 (1) There were no loans held for sale at March 31, 2019 and December 31, 2018 . (2) Represents loans from our consumer finance subsidiary that was closed in 2017. Such loans 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, 2019 December 31, 2018 Acquired loans evaluated individually for future credit losses: Outstanding principal balance $ 8,068 8,189 Carrying value 5,607 5,690 Acquired loans evaluated collectively for future credit losses: Outstanding principal balance 1,005,356 637,170 Carrying value 993,409 632,564 Total acquired loans: Outstanding principal balance 1,013,424 645,359 Carrying value 999,016 638,254
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, 2017 $ 1,540 Accretion (785 ) Net reclassification from nonaccretable yield — Balance at December 31, 2018 755 Accretion (132 ) Net reclassification from nonaccretable yield — Balance at March 31, 2019 $ 623
Schedule of the composition of impaired loans by portfolio segment and by class of financing receivable	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, 2019 (in thousands): Carrying value Outstanding principal balance Related impairment reserve Average recorded investment in impaired loans Interest income recognized Personal Banking: Residential mortgage loans $ 975 1,579 6 982 32 Home equity loans 997 1,960 7 1,003 28 Consumer loans 17 36 4 24 3 Total Personal Banking 1,989 3,575 17 2,009 63 Commercial Banking: Commercial real estate loans 3,539 4,408 1 3,561 67 Commercial loans 79 85 — 79 2 Total Commercial Banking 3,618 4,493 1 3,640 69 Total $ 5,607 8,068 18 5,649 132 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, 2018 (in thousands): Carrying Outstanding Related Average Interest Personal Banking: Residential mortgage loans $ 990 1,598 6 1,294 226 Home equity loans 1,008 1,959 7 1,483 157 Consumer loans 29 76 4 53 35 Total Personal Banking 2,027 3,633 17 2,830 418 Commercial Banking: Commercial real estate loans 3,584 4,471 1 4,028 358 Commercial loans 79 85 — 82 9 Total Commercial Banking 3,663 4,556 1 4,110 367 Total $ 5,690 8,189 18 6,940 785 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, 2019 (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 $ 10,781 2,271 505 6,318 19,875 19,696 258 Home equity loans 5,542 1,757 — 1,780 9,079 8,698 166 Consumer loans 3,215 913 — — 4,128 3,992 92 Total Personal Banking 19,538 4,941 505 8,098 33,082 32,386 516 Commercial Banking: Commercial real estate loans 24,528 16,750 3,390 7,460 52,128 48,887 486 Commercial loans 2,027 4,995 232 2,303 9,557 8,877 111 Total Commercial Banking 26,555 21,745 3,622 9,763 61,685 57,764 597 Total $ 46,093 26,686 4,127 17,861 94,767 90,150 1,113 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, 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 $ 12,965 2,883 — 6,660 22,508 20,733 910 Home equity loans 5,996 1,079 — 1,818 8,893 9,075 511 Consumer finance loans 22 — — — 22 24 — Consumer loans 3,228 1,072 — — 4,300 3,992 235 Total Personal Banking 22,211 5,034 — 8,478 35,723 33,824 1,656 Commercial Banking: Commercial real estate loans 25,509 11,426 8,549 4,435 49,919 41,328 1,599 Commercial loans 3,010 5,091 2,453 2,087 12,641 9,186 507 Total Commercial Banking 28,519 16,517 11,002 6,522 62,560 50,514 2,106 Total $ 50,730 21,551 11,002 15,000 98,283 84,338 3,762
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, 2019 (in thousands): Balance as of Current period provision Charge-offs Recoveries Balance as of Originated loans: Personal Banking: Residential mortgage loans $ 4,005 186 (349 ) 114 4,054 Home equity loans 3,062 (35 ) (112 ) 25 3,184 Consumer finance loans 405 (229 ) (179 ) 137 676 Consumer loans 11,130 3,051 (2,809 ) 484 10,404 Total Personal Banking 18,602 2,973 (3,449 ) 760 18,318 Commercial Banking: Commercial real estate loans 25,470 (464 ) (569 ) 124 26,379 Commercial loans 7,639 874 (457 ) 168 7,054 Total Commercial Banking 33,109 410 (1,026 ) 292 33,433 Total originated loans 51,711 3,383 (4,475 ) 1,052 51,751 Acquired loans: Personal Banking: Residential mortgage loans 92 8 (8 ) 9 83 Home equity loans 399 45 (42 ) 48 348 Consumer loans 454 34 (32 ) 33 419 Total Personal Banking 945 87 (82 ) 90 850 Commercial Banking: Commercial real estate loans 2,467 255 (35 ) 251 1,996 Commercial loans 598 2,742 (2,813 ) 52 617 Total Commercial Banking 3,065 2,997 (2,848 ) 303 2,613 Total acquired loans 4,010 3,084 (2,930 ) 393 3,463 Total $ 55,721 6,467 (7,405 ) 1,445 55,214 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 as of Current period provision Charge-offs Recoveries Balance as of December 31, 2017 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
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, 2019 (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 $ 2,867,161 4,097 13,052 — 7,517 813 — Home equity loans 1,324,405 3,462 7,299 166 2,125 510 31 Consumer finance loans 2,292 405 — — — — — Consumer loans 928,770 11,583 4,128 — — — — Total Personal Banking 5,122,628 19,547 24,479 166 9,642 1,323 31 Commercial Banking: Commercial real estate loans 2,799,309 27,937 41,278 — 19,372 1,568 491 Commercial loans 647,938 8,237 7,022 — 3,798 330 6 Total Commercial Banking 3,447,247 36,174 48,300 — 23,170 1,898 497 Total $ 8,569,875 55,721 72,779 166 32,812 3,221 528 (1) Includes $15.0 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, 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 $ 2,864,470 4,137 15,848 — 5,382 993 — Home equity loans 1,258,422 3,532 7,075 136 4,502 1,520 4 Consumer finance loans 3,817 676 22 3 — — — Consumer loans 855,896 10,823 4,300 27 — — — Total Personal Banking 4,982,605 19,168 27,245 166 9,884 2,513 4 Commercial Banking: Commercial real estate loans 2,471,821 28,375 36,935 — 19,859 313 310 Commercial loans 597,013 7,671 8,101 — 3,865 263 74 Total Commercial Banking 3,068,834 36,046 45,036 — 23,724 576 384 Total $ 8,051,439 55,214 72,281 166 33,608 3,089 388 (1) Includes $15.3 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, 2019 (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 $ 2,859,252 7,909 7,909 813 — Home equity loans 1,322,279 2,126 2,126 510 — Consumer finance loans 2,292 — — — — Consumer loans 928,747 23 23 6 — Total Personal Banking 5,112,570 10,058 10,058 1,329 — Commercial Banking: Commercial real estate loans 2,764,907 34,402 31,264 6,249 3,138 Commercial loans 640,264 7,674 6,399 746 1,275 Total Commercial Banking 3,405,171 42,076 37,663 6,995 4,413 Total $ 8,517,741 52,134 47,721 8,324 4,413 The following table provides information related to the evaluation of impaired loans by portfolio segment and by class of financing receivable at December 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 $ 2,856,359 8,111 8,111 747 — Home equity loans 1,256,255 2,167 2,167 523 — Consumer finance loans 3,817 — — — — Consumer loans 855,867 29 29 6 — Total Personal Banking 4,972,298 10,307 10,307 1,276 — Commercial Banking: Commercial real estate loans 2,436,605 35,216 31,830 6,499 3,386 Commercial loans 588,932 8,081 6,738 767 1,343 Total Commercial Banking 3,025,537 43,297 38,568 7,266 4,729 Total $ 7,997,835 53,604 48,875 8,542 4,729
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, 2019 2018 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 195 $ 33,608 205 $ 32,104 New TDRs — — 9 4,935 Re-modified TDRs — — — — Net paydowns (796 ) (947 ) Charge-offs: Residential mortgage loans — — 1 (135 ) Home equity loans — — — — Commercial real estate loans — — 1 (203 ) Commercial loans — — 1 (721 ) Paid-off loans: Residential mortgage loans — — 1 (249 ) Home equity loans — — 1 (12 ) Commercial real estate loans — — 4 (1,574 ) Commercial loans — — 5 (2,232 ) Ending TDR balance: 195 $ 32,812 200 $ 30,966 Accruing TDRs $ 17,861 $ 19,749 Non-accrual TDRs 14,951 11,217
Schedule of troubled debt restructurings (including re-modified TDRs) by portfolio segment and by class of financing receivable	During the quarter ended March 31, 2019 , there were no new TDRs. Additionally, no TDRs modified within the previous twelve months of March 31, 2019 have subsequently defaulted. The following tables provide information related to troubled debt restructurings (including re-modified TDRs) by portfolio segment and by class of financing receivable during the period indicated (dollars in thousands): For the quarter ended March 31, 2018 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
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 restructurings (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
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, 2019 (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 $ 25,013 2,427 9,332 36,772 2,734,070 2,770,842 — Home equity loans 6,440 1,880 4,263 12,583 1,022,606 1,035,189 — Consumer finance loans 295 47 — 342 1,950 2,292 — Consumer loans 7,032 2,021 3,001 12,054 864,507 876,561 — Total Personal Banking 38,780 6,375 16,596 61,751 4,623,133 4,684,884 — Commercial Banking: Commercial real estate loans 28,064 859 21,205 50,128 2,255,348 2,305,476 — Commercial loans 2,318 117 1,525 3,960 576,539 580,499 — Total Commercial Banking 30,382 976 22,730 54,088 2,831,887 2,885,975 — Total originated loans 69,162 7,351 39,326 115,839 7,455,020 7,570,859 — Acquired loans: Personal Banking: Residential mortgage loans 2,996 175 1,469 4,640 91,679 96,319 20 Home equity loans 1,186 664 1,279 3,129 286,087 289,216 — Consumer loans 196 109 220 525 51,684 52,209 6 Total Personal Banking 4,378 948 2,968 8,294 429,450 437,744 26 Commercial Banking: Commercial real estate loans 901 3,205 3,384 7,490 486,343 493,833 61 Commercial loans 1,041 621 502 2,164 65,275 67,439 — Total Commercial Banking 1,942 3,826 3,886 9,654 551,618 561,272 61 Total acquired loans 6,320 4,774 6,854 17,948 981,068 999,016 87 Total loans $ 75,482 12,125 46,180 133,787 8,436,088 8,569,875 87 (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, 2019 (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 $ 25,013 2,427 9,332 36,772 2,734,070 2,770,842 — Home equity loans 6,440 1,880 4,263 12,583 1,022,606 1,035,189 — Consumer finance loans 295 47 — 342 1,950 2,292 — Consumer loans 7,032 2,021 3,001 12,054 864,507 876,561 — Total Personal Banking 38,780 6,375 16,596 61,751 4,623,133 4,684,884 — Commercial Banking: Commercial real estate loans 28,064 859 21,205 50,128 2,255,348 2,305,476 — Commercial loans 2,318 117 1,525 3,960 576,539 580,499 — Total Commercial Banking 30,382 976 22,730 54,088 2,831,887 2,885,975 — Total originated loans 69,162 7,351 39,326 115,839 7,455,020 7,570,859 — Acquired loans: Personal Banking: Residential mortgage loans 2,996 175 1,469 4,640 91,679 96,319 20 Home equity loans 1,186 664 1,279 3,129 286,087 289,216 — Consumer loans 196 109 220 525 51,684 52,209 6 Total Personal Banking 4,378 948 2,968 8,294 429,450 437,744 26 Commercial Banking: Commercial real estate loans 901 3,205 3,384 7,490 486,343 493,833 61 Commercial loans 1,041 621 502 2,164 65,275 67,439 — Total Commercial Banking 1,942 3,826 3,886 9,654 551,618 561,272 61 Total acquired loans 6,320 4,774 6,854 17,948 981,068 999,016 87 Total loans $ 75,482 12,125 46,180 133,787 8,436,088 8,569,875 87 (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, 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 Originated loans: Personal Banking: Residential mortgage loans $ 27,245 5,732 11,668 44,645 2,714,474 2,759,119 — Home equity loans 6,810 1,771 4,825 13,406 1,030,472 1,043,878 — Consumer finance loans 661 172 21 854 2,963 3,817 — Consumer loans 9,000 2,867 3,037 14,904 793,092 807,996 — Total Personal Banking 43,716 10,542 19,551 73,809 4,541,001 4,614,810 — Commercial Banking: Commercial real estate loans 5,391 4,801 21,721 31,913 2,217,105 2,249,018 — Commercial loans 609 560 2,714 3,883 545,474 549,357 — Total Commercial Banking 6,000 5,361 24,435 35,796 2,762,579 2,798,375 — Total originated loan 49,716 15,903 43,986 109,605 7,303,580 7,413,185 — Acquired loans: Personal Banking: Residential mortgage loans 532 693 1,317 2,542 91,240 93,782 19 Home equity loans 1,839 294 1,212 3,345 211,199 214,544 40 Consumer loans 447 175 196 818 58,651 59,469 6 Total Personal Banking 2,818 1,162 2,725 6,705 361,090 367,795 65 Commercial Banking: Commercial real estate loans 112 586 3,866 4,564 218,239 222,803 78 Commercial loans 364 — 296 660 46,996 47,656 — Total Commercial Banking 476 586 4,162 5,224 265,235 270,459 78 Total acquired loan 3,294 1,748 6,887 11,929 626,325 638,254 143 Total $ 53,010 17,651 50,873 121,534 7,929,905 8,051,439 143 (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 three months ended March 31, 2019 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans: Personal Banking: Residential mortgage loans $ 2,762,876 — 7,966 — — 2,770,842 Home equity loans 1,029,941 — 5,248 — — 1,035,189 Consumer finance loans 2,292 — — — — 2,292 Consumer loans 872,778 — 3,783 — — 876,561 Total Personal Banking 4,667,887 — 16,997 — — 4,684,884 Commercial Banking: Commercial real estate loans 2,113,010 84,164 108,302 — — 2,305,476 Commercial loans 513,805 34,096 32,598 — — 580,499 Total Commercial Banking 2,626,815 118,260 140,900 — — 2,885,975 Total originated loans 7,294,702 118,260 157,897 — — 7,570,859 Acquired loans: Personal Banking: Residential mortgage loans 95,131 — 1,188 — — 96,319 Home equity loans 287,382 — 1,834 — — 289,216 Consumer loans 51,762 — 447 — — 52,209 Total Personal Banking 434,275 — 3,469 — — 437,744 Commercial Banking: Commercial real estate loans 464,166 2,889 26,778 — — 493,833 Commercial loans 59,355 514 7,570 — — 67,439 Total Commercial Banking 523,521 3,403 34,348 — — 561,272 Total acquired loans 957,796 3,403 37,817 — — 999,016 Total loans $ 8,252,498 121,663 195,714 — — 8,569,875 The following table sets forth information about credit quality indicators, which were updated during the year ended December 31, 2018 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans: Personal Banking: Residential mortgage loans $ 2,749,266 — 9,853 — — 2,759,119 Home equity loans 1,038,245 — 5,633 — — 1,043,878 Consumer finance loans 3,817 — — — — 3,817 Consumer loans 804,075 — 3,921 — — 807,996 Total Personal Banking 4,595,403 — 19,407 — — 4,614,810 Commercial Banking: Commercial real estate loans 2,062,728 91,142 95,148 — — 2,249,018 Commercial loans 503,665 15,760 29,932 — — 549,357 Total Commercial Banking 2,566,393 106,902 125,080 — — 2,798,375 Total originated loans 7,161,796 106,902 144,487 — — 7,413,185 Acquired loans: Personal Banking: Residential mortgage loans 92,625 — 1,157 — — 93,782 Home equity loans 213,273 — 1,271 — — 214,544 Consumer loans 58,954 — 515 — — 59,469 Total Personal Banking 364,852 — 2,943 — — 367,795 Commercial Banking: Commercial real estate loans 191,622 3,546 27,635 — — 222,803 Commercial loans 35,397 3,521 8,738 — — 47,656 Total Commercial Banking 227,019 7,067 36,373 — — 270,459 Total acquired loans 591,871 7,067 39,316 — — 638,254 Total $ 7,753,667 113,969 183,803 — — 8,051,439

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 December 31, 2018 Amortizable intangible assets: Core deposit intangibles - gross $ 63,685 63,685 Acquisitions 7,498 — Less: accumulated amortization (46,324 ) (45,027 ) Core deposit intangibles - net 24,859 18,658 Customer and Contract intangible assets - gross 10,474 10,474 Less: accumulated amortization (9,461 ) (9,311 ) Customer and Contract intangible assets - net $ 1,013 1,163
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, 2019 and 2018 , 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, 2019 $ 1,447 For the quarter ended March 31, 2018 1,520 For the year ending December 31, 2019 6,718 For the year ending December 31, 2020 5,535 For the year ending December 31, 2021 4,438 For the year ending December 31, 2022 3,438 For the year ending December 31, 2023 2,561 For the year ending December 31, 2024 1,876
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, 2017 $ 307,420 Goodwill from acquisition — Balance at December 31, 2018 307,420 Goodwill from acquisition 37,300 Balance at March 31, 2019 $ 344,720

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 2018 Reported net income $ 25,044 24,985 Weighted average common shares outstanding 103,101,789 101,598,928 Dilutive potential shares due to effect of stock options 1,394,803 1,537,569 Total weighted average common shares and dilutive potential shares 104,496,592 103,136,497 Basic earnings per share: $ 0.24 0.25 Diluted earnings per share: $ 0.24 0.24

Pension and Other Post-retire_2

Pension and Other Post-retirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2019
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 2019 2018 2019 2018 Service cost $ 1,274 1,716 — — Interest cost 1,827 1,678 11 14 Expected return on plan assets (2,759 ) (2,992 ) — — Amortization of prior service cost (581 ) (581 ) — — Amortization of the net loss 855 873 17 24 Net periodic cost $ 616 694 28 38

Disclosures About Fair Value _2

Disclosures About Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 92,924 92,924 92,924 — — Securities available-for-sale 842,657 842,657 — 842,657 — Securities held-to-maturity 21,671 21,597 — 21,597 — Loans receivable, net 8,514,154 8,423,354 — — 8,423,354 Accrued interest receivable 28,107 28,107 28,107 — — Interest rate swaps 10,537 10,537 — 10,537 — FHLB stock 12,533 12,533 — — — Total financial assets $ 9,522,583 9,431,709 121,031 874,791 8,423,354 Financial liabilities: Savings and checking deposits $ 7,065,197 7,065,197 7,065,197 — — Time deposits 1,527,327 1,517,324 — — 1,517,324 Borrowed funds 114,081 114,081 114,081 — — Junior subordinated debentures 121,757 109,880 — — 109,880 Interest rate swaps 10,537 10,537 — 10,537 — Accrued interest payable 1,111 1,111 1,111 — — Total financial liabilities $ 8,840,010 8,818,130 7,180,389 10,537 1,627,204 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, 2018 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 68,789 68,789 68,789 — — Securities available-for-sale 801,450 801,450 — 801,450 — Securities held-to-maturity 22,765 22,446 — 22,446 — Loans receivable, net 7,996,225 7,845,313 — — 7,845,313 Accrued interest receivable 24,490 24,490 24,490 — — Interest rate swaps 6,445 6,445 — 6,445 — FHLB stock 15,635 15,635 — — — Total financial assets $ 8,935,799 8,784,568 93,279 830,341 7,845,313 Financial liabilities: Savings and checking accounts $ 6,489,338 6,489,338 6,489,338 — — Time deposits 1,404,841 1,434,410 — — 1,434,410 Borrowed funds 234,389 234,389 234,389 — — Junior subordinated debentures 111,213 102,572 — — 102,572 Interest rate swaps 6,445 6,445 — 6,445 — Accrued interest payable 744 744 744 — — Total financial liabilities $ 8,246,970 8,267,898 6,724,471 6,445 1,536,982
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, 2019 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Debt securities: U.S. government and agencies $ — 14,848 — 14,848 Government sponsored enterprises — 188,960 — 188,960 States and political subdivisions — 32,028 — 32,028 Corporate — 956 — 956 Total debt securities — 236,792 — 236,792 Residential mortgage-backed securities: GNMA — 26,379 — 26,379 FNMA — 90,852 — 90,852 FHLMC — 58,900 — 58,900 Non-agency — 521 — 521 Collateralized mortgage obligations: GNMA — 50,410 — 50,410 FNMA — 222,774 — 222,774 FHLMC — 156,029 — 156,029 Non-agency — — — — Total mortgage-backed securities — 605,865 — 605,865 Interest rate swaps — 10,537 — 10,537 Total assets $ — 853,194 — 853,194 Interest rate swaps $ — 10,537 — 10,537 Total liabilities $ — 10,537 — 10,537 The following table represents assets and liabilities measured at fair value on a recurring basis at December 31, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Debt securities: U.S. government and agencies $ — 14,780 — 14,780 Government sponsored enterprises — 187,335 — 187,335 States and political subdivisions — 21,163 — 21,163 Corporate — 914 — 914 Total debt securities — 224,192 — 224,192 Residential mortgage-backed securities: GNMA — 27,041 — 27,041 FNMA — 73,196 — 73,196 FHLMC — 51,621 — 51,621 Non-agency — 528 — 528 Collateralized mortgage obligations: GNMA — 52,331 52,331 FNMA — 207,033 — 207,033 FHLMC — 165,508 — 165,508 Non-agency — — — — Total mortgage-backed securities — 577,258 — 577,258 Interest rate swaps — 6,445 — 6,445 Total assets $ — 807,895 — 807,895 Interest rate swaps $ — 6,445 — 6,445 Total liabilities $ — 6,445 — 6,445
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, 2019 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 39,397 39,397 Real estate owned — — 2,345 2,345 Total assets $ — — 41,742 41,742 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, 2018 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 40,333 40,333 Real estate owned — — 2,498 2,498 Total assets $ — — 42,831 42,831
Schedule of quantitative information about assets measured at fair value on a recurring and nonrecurring basis for Level 3 fair value measurements	The following 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, 2019 (dollar amounts in thousands): Fair value Valuation techniques Significant unobservable inputs Range (weighted average) Loans measured for impairment $ 39,397 Appraisal value (1) Estimated cost to sell 10.0% Discounted cash flow Discount rate 4.25% to 10.0% (7.50%) Real estate owned $ 2,345 Appraisal value (1) Estimated cost to sell 10.0% (1) Fair value is generally determined through independent appraisals of the underlying collateral, which may include Level 3 inputs that are not identifiable, or by using the discounted cash flow method if the loan is not collateral dependent.

Derivative Financial Instrume_2

Derivative Financial Instruments - (Tables)	3 Months Ended
	Mar. 31, 2019
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 (in thousands): Asset derivatives Liability derivatives Notional amount Fair value Notional amount Fair value At March 31, 2019 Derivatives not designated as hedging instruments: Interest rate swap agreements $ 261,604 10,537 258,871 10,537 Total derivatives $ 261,604 10,537 258,871 10,537 At December 31, 2018 Derivatives not designated as hedging instruments: Interest rate swap agreements $ 221,919 6,445 221,919 6,445 Total derivatives $ 221,919 6,445 221,919 6,445
Derivative instruments gain (loss)	The following table presents income or expense recognized on derivatives for the periods indicated (in thousands): For the quarter ended March 31, 2019 2018 Hedging interest rate derivatives: Increase in interest expense $ — 332 Non-hedging swap derivatives: Increase in other income — 129

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Schedule of changes in accumulated other comprehensive income by component	The following table shows the changes in accumulated other comprehensive income/(loss) by component for the periods indicated (in thousands): For the quarter ended March 31, 2019 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, 2018 $ (6,832 ) — (32,864 ) (39,696 ) Other comprehensive income before reclassification adjustments 4,452 — — 4,452 Amounts reclassified from accumulated other comprehensive income (1), (2) — — 209 209 Net other comprehensive income 4,452 — 209 4,661 Balance as of March 31, 2019 $ (2,380 ) — (32,655 ) (35,035 ) 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/(loss) before reclassification adjustments (3,955 ) 360 — (3,595 ) Amounts reclassified from accumulated other comprehensive income (3), (4) (26 ) — 226 200 Net other comprehensive income/(loss) (4,972 ) 211 (5,380 ) (10,141 ) Balance as of March 31, 2018 $ (9,381 ) (480 ) (32,360 ) (42,221 ) (1) There were no realized gains on securities reclassified from accumulated other comprehensive income. (2) Consists of amortization of prior service cost (compensation and employee benefits) of $581 and amortization of net loss (compensation and employee benefits) of $(872) , net of tax (income tax expense) of $82 . (3) Consists of realized gains on securities (gain on sales of investments, net) of $33 , net of tax (income tax expense) of $(7) . (4) 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 .

Basis of Presentation and Inf_3

Basis of Presentation and Informational Disclosures (Details)	3 Months Ended
	Mar. 31, 2019USD ($)bank	Mar. 31, 2018USD ($)	Jan. 01, 2019USD ($)	Dec. 31, 2018USD ($)
Stock Related Compensation
Number of banking locations | bank	182
Stock-based compensation expense	$ 1,200,000	$ 978,000
Unrecognized tax benefits liability	0
Operating lease ROU assets (other assets)	43,479,000
Operating lease liability	46,147,000
Retained earnings	555,205,000			$ 550,374,000
Accounting Standards Update 2016-02
Stock Related Compensation
Operating lease ROU assets (other assets)			$ 40,200,000
Operating lease liability			42,200,000
Retained earnings			$ 1,600,000
Employee Stock Option
Stock Related Compensation
Compensation expense yet to be recognized	3,800,000
Common stock
Stock Related Compensation
Compensation expense yet to be recognized	$ 16,600,000

Acquisition - Narrative (Detail

Acquisition - Narrative (Details) $ / shares in Units, $ in Thousands	Mar. 08, 2019USD ($)shareholderoffice$ / sharesshares	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)
Acquisition
Cash paid to DFSC		$ 42,500	$ 0
Donegal Financial Services Corporation
Acquisition
Total consideration	$ 85,788
Number of offices acquired | office	12
Number of counterparty shareholders | shareholder	2
Cash as percent of total consideration	50.00%
Stock as percent of total consideration	50.00%
Cash paid to DFSC	$ 42,500
Stock issued for acquisition (in shares) | shares	2,462,373
Value of stock issued for purchase	$ 43,288
Closing price of Company's stock issued for purchase (in dollars per share) | $ / shares	$ 17.58
Additional cost expensed		$ 1,900
Core Deposits | Donegal Financial Services Corporation
Acquisition
Acquired finite-lived intangible assets weighted average useful life	7 years

Acquisition - Assets Acquired a

Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 08, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Consideration paid:
Cash paid to DFSC		$ 42,500	$ 0
Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value
Goodwill		$ 344,720		$ 307,420	$ 307,420
Donegal Financial Services Corporation
Consideration paid:
Northwest Bancshares, Inc. common stock issued	$ 43,288
Cash paid to DFSC	42,500
Total consideration paid	85,788
Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value
Cash and cash equivalents	16,667
Investment securities available-for-sale	78,594
Loans	407,840
Federal Home Loan Bank stock	453
Premises and equipment	6,520
Core deposit intangible	7,498
Other assets	25,535
Deposits	(479,379)
Other liabilities	(15,240)
Total identifiable net assets	48,488
Goodwill	$ 37,300

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Millions	Mar. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Undiscounted payments for leases not yet commenced	$ 3.4
Minimum
Lessee, Lease, Description [Line Items]
Lessor, Operating Lease, Renewal Term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease term of contract (up to)	35 years
Lessor, Operating Lease, Renewal Term	10 years

Leases - Schedule of Lease Cost

Leases - Schedule of Lease Cost (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease costs (office operations)	$ 1,299
Variable lease costs (office operations)	134
Total operating lease costs	$ 1,433

Leases - Schedule of Lease Asse

Leases - Schedule of Lease Assets and Liabilities (Details) $ in Thousands	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease ROU assets (other assets)	$ 43,479
Operating lease liability	$ 46,147

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Cash Flow Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating cash flow from operating leases	$ 1,441
ROU assets obtained in exchange for lease obligations	$ 4,126
Weighted average remaining lease term	15 years 6 months
Weighted average discount rate	3.80%

Leases - Schedule of Lease Matu

Leases - Schedule of Lease Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]
2019	$ 4,112
2020	4,940
2021	4,604
2022	4,297
2023	4,035
Thereafter	40,973
Total lease payments	62,961
Less amount of lease payments representing interest	16,814
Total present value of lease payments	$ 46,147
Lease Maturities Before Topic 842
2019		$ 4,677
2020		3,884
2021		3,179
2022		2,465
2023		2,040
Thereafter		7,784
Total lease payments		$ 24,029

Investment securities and imp_3

Investment securities and impairment of investment securities - Available For Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized cost
Residential mortgage-backed securities	$ 845,989	$ 811,015
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	4,804	2,958
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(8,136)	(12,523)
Fair value
Securities available-for-sale	842,657	801,450
U.S. government and agencies
Amortized cost
Due in one year or less	14,804
Due in one year through five years		14,756
Gross unrealized holding gains
Due in one year or less	44
Due in one year through five years		24
Gross unrealized holding losses
Due in one year or less	0
Due in one year through five years		0
Fair value
Due in one year or less	14,848
Due in one year through five years		14,780
Debt issued by government sponsored enterprises:
Amortized cost
Due in one year or less	85,092	85,089
Due in one year through five years	101,060	101,078
Due in five years through ten years	987
Due after ten years	3,295	3,546
Gross unrealized holding gains
Due in one year or less	0	0
Due in one year through five years	204	71
Due in five years through ten years	15
Due after ten years	0	0
Gross unrealized holding losses
Due in one year or less	(457)	(795)
Due in one year through five years	(1,104)	(1,512)
Due in five years through ten years	0
Due after ten years	(132)	(142)
Fair value
Due in one year or less	84,635	84,294
Due in one year through five years	100,160	99,637
Due in five years through ten years	1,002
Due after ten years	3,163	3,404
Municipal securities
Amortized cost
Due in one year or less	974	1,333
Due in one year through five years	3,990	3,985
Due in five years through ten years	12,086	10,603
Due after ten years	14,716	5,105
Gross unrealized holding gains
Due in one year or less	2	2
Due in one year through five years	73	54
Due in five years through ten years	100	60
Due after ten years	87	31
Gross unrealized holding losses
Due in one year or less	0	(6)
Due in one year through five years	0	(4)
Due in five years through ten years	0	0
Due after ten years	0	0
Fair value
Due in one year or less	976	1,329
Due in one year through five years	4,063	4,035
Due in five years through ten years	12,186	10,663
Due after ten years	14,803	5,136
Corporate debt securities
Amortized cost
Due in one year or less	41
Due in five years through ten years	915	914
Gross unrealized holding gains
Due in one year or less	0
Due in five years through ten years	0	0
Gross unrealized holding losses
Due in one year or less	0
Due in five years through ten years	0	0
Fair value
Due in one year or less	41
Due in five years through ten years	915	914
Residential mortgage-backed securities
Amortized cost
Residential mortgage-backed securities	608,029	584,606
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	4,279	2,716
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(6,443)	(10,064)
Fair value
Securities available-for-sale	605,865	577,258
Fixed rate | Pass-through
Amortized cost
Residential mortgage-backed securities	154,338	130,172
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	1,224	568
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(2,585)	(4,113)
Fair value
Securities available-for-sale	152,977	126,627
Fixed rate | Agency CMOs
Amortized cost
Residential mortgage-backed securities	368,622	365,427
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	1,958	865
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(3,680)	(5,921)
Fair value
Securities available-for-sale	366,900	360,371
Variable rate | Pass-through
Amortized cost
Residential mortgage-backed securities	22,782	24,761
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	899	1,003
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(6)	(5)
Fair value
Securities available-for-sale	23,675	25,759
Variable rate | Agency CMOs
Amortized cost
Residential mortgage-backed securities	62,287	64,246
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	198	280
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(172)	(25)
Fair value
Securities available-for-sale	$ 62,313	$ 64,501

Investment securities and imp_4

Investment securities and impairment of investment securities - Held To Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized cost
Marketable securities held-to-maturity, amortized cost	$ 21,671	$ 22,765
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	139	103
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	(213)	(422)
Fair value
Marketable securities held-to-maturity, fair value	21,597	22,446
Residential mortgage-backed securities
Amortized cost
Marketable securities held-to-maturity, amortized cost	21,671	22,765
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	139	103
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	(213)	(422)
Fair value
Marketable securities held-to-maturity, fair value	21,597	22,446
Fixed rate | Pass-through
Amortized cost
Marketable securities held-to-maturity, amortized cost	2,734	2,896
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	81	53
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	0	0
Fair value
Marketable securities held-to-maturity, fair value	2,815	2,949
Fixed rate | Agency CMOs
Amortized cost
Marketable securities held-to-maturity, amortized cost	16,698	17,552
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	6	0
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	(213)	(422)
Fair value
Marketable securities held-to-maturity, fair value	16,491	17,130
Variable rate | Pass-through
Amortized cost
Marketable securities held-to-maturity, amortized cost	1,588	1,666
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	42	39
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	0	0
Fair value
Marketable securities held-to-maturity, fair value	1,630	1,705
Variable rate | Agency CMOs
Amortized cost
Marketable securities held-to-maturity, amortized cost	651	651
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	10	11
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	0	0
Fair value
Marketable securities held-to-maturity, fair value	$ 661	$ 662

Investment securities and imp_5

Investment securities and impairment of investment securities - Fair Value of and Gross Unrealized Losses on Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Marketable securities
Less than 12 months - Fair value	$ 31,340	$ 34,960
Less than 12 months - Unrealized loss	(165)	(31)
12 months or more - Fair value	459,613	484,809
12 months or more - Unrealized loss	(8,184)	(12,915)
Total - Fair value	490,953	519,769
Total - Unrealized loss	(8,349)	(12,946)
U.S. government and agencies
Marketable securities
Less than 12 months - Fair value	0	0
Less than 12 months - Unrealized loss	0	0
12 months or more - Fair value	136,932	136,425
12 months or more - Unrealized loss	(1,692)	(2,449)
Total - Fair value	136,932	136,425
Total - Unrealized loss	(1,692)	(2,449)
Municipal securities
Marketable securities
Less than 12 months - Fair value		929
Less than 12 months - Unrealized loss		(1)
12 months or more - Fair value		1,709
12 months or more - Unrealized loss		(10)
Total - Fair value		2,638
Total - Unrealized loss		(11)
Residential mortgage-backed securities | Agency CMOs
Marketable securities
Less than 12 months - Fair value	31,340	34,031
Less than 12 months - Unrealized loss	(165)	(30)
12 months or more - Fair value	322,681	346,675
12 months or more - Unrealized loss	(6,492)	(10,456)
Total - Fair value	354,021	380,706
Total - Unrealized loss	$ (6,657)	$ (10,486)

Investment securities and imp_6

Investment securities and impairment of investment securities - Cumulative roll forward of credit losses recognized in earnings for debt securities held and not intended to be sold (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cumulative roll forward of credit related impairment losses recognized in earnings for debt securities held and not intended to be sold:
Beginning balance	$ 0	$ 352
Credit losses on debt securities for which other-than-temporary impairment was not previously recognized	0	0
Reduction for losses realized during the quarter	0	0
Reduction for securities sold/called realized during the quarter	0	(352)
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized	0	0
Ending balance	$ 0	$ 0

Loans receivable - Summary of O

Loans receivable - Summary of Originated and Acquired Loans (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	$ 8,744,363,000	$ 8,257,652,000
Deferred loan costs	40,732,000	37,618,000
Allowance for loan losses	(55,721,000)	(55,214,000)	$ (55,211,000)	$ (56,795,000)
Total loans receivable, net	8,514,154,000	7,996,225,000
Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(8,440,000)	(11,513,000)
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(151,702,000)	(167,553,000)
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(55,078,000)	(64,765,000)
Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	5,090,336,000	4,956,500,000
Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,859,511,000	2,860,212,000
Residential mortgage loans held-for-sale	0	0
Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	1,324,405,000	1,258,422,000
Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,292,000	3,817,000
Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	904,128,000	834,049,000
Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	3,654,027,000	3,301,152,000
Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,951,011,000	2,639,374,000
Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	703,016,000	661,778,000
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	7,731,415,000	7,618,512,000
Deferred loan costs	40,043,000	36,820,000
Allowance for loan losses	(51,711,000)	(51,751,000)	(49,123,000)	(50,572,000)
Total loans receivable, net	7,519,148,000	7,361,434,000
Originated | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(8,440,000)	(11,513,000)
Originated | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(138,241,000)	(167,029,000)
Originated | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(53,918,000)	(63,605,000)
Originated | Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	4,653,281,000	4,589,503,000
Allowance for loan losses	(18,602,000)	(18,318,000)	(19,612,000)	(20,339,000)
Originated | Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,763,192,000	2,766,430,000
Allowance for loan losses	(4,005,000)	(4,054,000)	(3,724,000)	(3,824,000)
Originated | Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	1,035,189,000	1,043,878,000
Allowance for loan losses	(3,062,000)	(3,184,000)	(3,717,000)	(4,072,000)
Originated | Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,292,000	3,817,000
Allowance for loan losses	(405,000)	(676,000)	(3,031,000)	(3,968,000)
Originated | Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	852,608,000	775,378,000
Allowance for loan losses	(11,130,000)	(10,404,000)	(9,140,000)	(8,475,000)
Originated | Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	3,078,134,000	3,029,009,000
Allowance for loan losses	(33,109,000)	(33,433,000)	(29,511,000)	(30,233,000)
Originated | Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,443,717,000	2,416,047,000
Allowance for loan losses	(25,470,000)	(26,379,000)	(20,218,000)	(19,911,000)
Originated | Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	634,417,000	612,962,000
Allowance for loan losses	(7,639,000)	(7,054,000)	(9,293,000)	(10,322,000)
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	1,012,948,000	639,140,000
Deferred loan costs	689,000	798,000
Allowance for loan losses	(4,010,000)	(3,463,000)	(6,088,000)	(6,223,000)
Total loans receivable, net	995,006,000	634,791,000
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	(13,461,000)	(524,000)
Acquired | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(1,160,000)	(1,160,000)
Acquired | Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	437,055,000	366,997,000
Allowance for loan losses	(945,000)	(850,000)	(1,624,000)	(1,783,000)
Acquired | Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	96,319,000	93,782,000
Allowance for loan losses	(92,000)	(83,000)	(89,000)	(131,000)
Acquired | Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	289,216,000	214,544,000
Allowance for loan losses	(399,000)	(348,000)	(728,000)	(762,000)
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	51,520,000	58,671,000
Allowance for loan losses	(454,000)	(419,000)	(807,000)	(890,000)
Acquired | Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	575,893,000	272,143,000
Allowance for loan losses	(3,065,000)	(2,613,000)
Acquired | Commercial Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			(3,430,000)	(3,549,000)
Acquired | Commercial Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			(1,034,000)	(891,000)
Acquired | Commercial Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			$ (4,464,000)	$ (4,440,000)
Acquired | Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	507,294,000	223,327,000
Allowance for loan losses	(2,467,000)	(1,996,000)
Acquired | Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	68,599,000	48,816,000
Allowance for loan losses	$ (598,000)	$ (617,000)

Loans receivable - Outstanding

Loans receivable - Outstanding Principal Balance and Related Carrying Value of Acquired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	$ 1,013,424	$ 645,359
Carrying value	999,016	638,254
Acquired loans evaluated individually for future credit losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	8,068	8,189
Carrying value	5,607	5,690
Acquired loans evaluated collectively for future credit losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	1,005,356	637,170
Carrying value	$ 993,409	$ 632,564

Loans receivable - Changes in t

Loans receivable - Changes in the Accretable Discount (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Changes in accretable yield
Beginning balance	$ 755	$ 1,540
Accretion	(132)	(785)
Net reclassification from nonaccretable yield	0	0
Ending balance	$ 623	$ 755

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, 2019	Dec. 31, 2018
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	$ 94,767	$ 98,283
Average recorded investment in impaired loans	90,150	84,338
Interest income recognized	1,113	3,762
Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	33,082	35,723
Average recorded investment in impaired loans	32,386	33,824
Interest income recognized	516	1,656
Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	19,875	22,508
Average recorded investment in impaired loans	19,696	20,733
Interest income recognized	258	910
Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	9,079	8,893
Average recorded investment in impaired loans	8,698	9,075
Interest income recognized	166	511
Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	4,128	4,300
Average recorded investment in impaired loans	3,992	3,992
Interest income recognized	92	235
Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	61,685	62,560
Average recorded investment in impaired loans	57,764	50,514
Interest income recognized	597	2,106
Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	52,128	49,919
Average recorded investment in impaired loans	48,887	41,328
Interest income recognized	486	1,599
Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	9,557	12,641
Average recorded investment in impaired loans	8,877	9,186
Interest income recognized	111	507
Acquired loans evaluated individually for future credit losses
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	5,607	5,690
Outstanding principal balance	8,068	8,189
Related impairment reserve	18	18
Average recorded investment in impaired loans	5,649	6,940
Interest income recognized	132	785
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	1,989	2,027
Outstanding principal balance	3,575	3,633
Related impairment reserve	17	17
Average recorded investment in impaired loans	2,009	2,830
Interest income recognized	63	418
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	975	990
Outstanding principal balance	1,579	1,598
Related impairment reserve	6	6
Average recorded investment in impaired loans	982	1,294
Interest income recognized	32	226
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	997	1,008
Outstanding principal balance	1,960	1,959
Related impairment reserve	7	7
Average recorded investment in impaired loans	1,003	1,483
Interest income recognized	28	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	17	29
Outstanding principal balance	36	76
Related impairment reserve	4	4
Average recorded investment in impaired loans	24	53
Interest income recognized	3	35
Acquired loans evaluated individually for future credit losses | Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	3,618	3,663
Outstanding principal balance	4,493	4,556
Related impairment reserve	1	1
Average recorded investment in impaired loans	3,640	4,110
Interest income recognized	69	367
Acquired loans evaluated individually for future credit losses | Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	3,539	3,584
Outstanding principal balance	4,408	4,471
Related impairment reserve	1	1
Average recorded investment in impaired loans	3,561	4,028
Interest income recognized	67	358
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	79	79
Outstanding principal balance	85	85
Related impairment reserve	0	0
Average recorded investment in impaired loans	79	82
Interest income recognized	$ 2	$ 9

Loans receivable - Changes in_2

Loans receivable - Changes in the Allowance for Losses on Loans Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	$ 55,214	$ 56,795
Current period provision	6,467	4,209
Charge-offs	(7,405)	(7,190)
Recoveries	1,445	1,397
Balance at the end of the period	55,721	55,211
Originated
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	51,751	50,572
Current period provision	3,383	3,926
Charge-offs	(4,475)	(6,595)
Recoveries	1,052	1,220
Balance at the end of the period	51,711	49,123
Originated | Personal Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	18,318	20,339
Current period provision	2,973	3,563
Charge-offs	(3,449)	(5,227)
Recoveries	760	937
Balance at the end of the period	18,602	19,612
Originated | Personal Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	4,054	3,824
Current period provision	186	31
Charge-offs	(349)	(196)
Recoveries	114	65
Balance at the end of the period	4,005	3,724
Originated | Personal Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	3,184	4,072
Current period provision	(35)	(85)
Charge-offs	(112)	(301)
Recoveries	25	31
Balance at the end of the period	3,062	3,717
Originated | Personal Banking | Consumer finance loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	676	3,968
Current period provision	(229)	338
Charge-offs	(179)	(1,553)
Recoveries	137	278
Balance at the end of the period	405	3,031
Originated | Personal Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	10,404	8,475
Current period provision	3,051	3,279
Charge-offs	(2,809)	(3,177)
Recoveries	484	563
Balance at the end of the period	11,130	9,140
Originated | Commercial Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	33,433	30,233
Current period provision	410	363
Charge-offs	(1,026)	(1,368)
Recoveries	292	283
Balance at the end of the period	33,109	29,511
Originated | Commercial Banking | Commercial real estate loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	26,379	19,911
Current period provision	(464)	703
Charge-offs	(569)	(540)
Recoveries	124	144
Balance at the end of the period	25,470	20,218
Originated | Commercial Banking | Commercial loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	7,054	10,322
Current period provision	874	(340)
Charge-offs	(457)	(828)
Recoveries	168	139
Balance at the end of the period	7,639	9,293
Acquired
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	3,463	6,223
Current period provision	3,084	283
Charge-offs	(2,930)	(595)
Recoveries	393	177
Balance at the end of the period	4,010	6,088
Acquired | Personal Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	850	1,783
Current period provision	87	105
Charge-offs	(82)	(387)
Recoveries	90	123
Balance at the end of the period	945	1,624
Acquired | Personal Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	83	131
Current period provision	8	(43)
Charge-offs	(8)	(5)
Recoveries	9	6
Balance at the end of the period	92	89
Acquired | Personal Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	348	762
Current period provision	45	202
Charge-offs	(42)	(310)
Recoveries	48	74
Balance at the end of the period	399	728
Acquired | Personal Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	419	890
Current period provision	34	(54)
Charge-offs	(32)	(72)
Recoveries	33	43
Balance at the end of the period	454	807
Acquired | Commercial Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	2,613
Current period provision	2,997
Charge-offs	(2,848)
Recoveries	303
Balance at the end of the period	3,065
Acquired | Commercial Banking | Residential mortgage 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 | Home equity 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
Acquired | Commercial Banking | Consumer loans
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 | Commercial real estate loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	1,996
Current period provision	255
Charge-offs	(35)
Recoveries	251
Balance at the end of the period	2,467
Acquired | Commercial Banking | Commercial loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	617
Current period provision	2,742
Charge-offs	(2,813)
Recoveries	52
Balance at the end of the period	$ 598

Loans receivable - Loan Portfol

Loans receivable - Loan Portfolio by Portfolio Segment and by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 8,569,875	$ 8,051,439
Allowance for loan losses	55,721	55,214
Nonaccrual loans	72,779	72,281
Loans past due 90 days or more and still accruing	166	166
TDRs	32,812	33,608	$ 30,966	$ 32,104
Allowance related to TDRs	3,221	3,089
Additional commitments to customers with loans classified as TDRs	528	388
Nonaccrual TDRs	14,951	15,300	$ 11,217
Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	5,122,628	4,982,605
Allowance for loan losses	19,547	19,168
Nonaccrual loans	24,479	27,245
Loans past due 90 days or more and still accruing	166	166
TDRs	9,642	9,884
Allowance related to TDRs	1,323	2,513
Additional commitments to customers with loans classified as TDRs	31	4
Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	2,867,161	2,864,470
Allowance for loan losses	4,097	4,137
Nonaccrual loans	13,052	15,848
Loans past due 90 days or more and still accruing	0	0
TDRs	7,517	5,382
Allowance related to TDRs	813	993
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	1,324,405	1,258,422
Allowance for loan losses	3,462	3,532
Nonaccrual loans	7,299	7,075
Loans past due 90 days or more and still accruing	166	136
TDRs	2,125	4,502
Allowance related to TDRs	510	1,520
Additional commitments to customers with loans classified as TDRs	31	4
Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	2,292	3,817
Allowance for loan losses	405	676
Nonaccrual loans	0	22
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	928,770	855,896
Allowance for loan losses	11,583	10,823
Nonaccrual loans	4,128	4,300
Loans past due 90 days or more and still accruing	0	27
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	3,447,247	3,068,834
Allowance for loan losses	36,174	36,046
Nonaccrual loans	48,300	45,036
Loans past due 90 days or more and still accruing	0	0
TDRs	23,170	23,724
Allowance related to TDRs	1,898	576
Additional commitments to customers with loans classified as TDRs	497	384
Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	2,799,309	2,471,821
Allowance for loan losses	27,937	28,375
Nonaccrual loans	41,278	36,935
Loans past due 90 days or more and still accruing	0	0
TDRs	19,372	19,859
Allowance related to TDRs	1,568	313
Additional commitments to customers with loans classified as TDRs	491	310
Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	647,938	597,013
Allowance for loan losses	8,237	7,671
Nonaccrual loans	7,022	8,101
Loans past due 90 days or more and still accruing	0	0
TDRs	3,798	3,865
Allowance related to TDRs	330	263
Additional commitments to customers with loans classified as TDRs	$ 6	$ 74

Loans receivable - Compositio_2

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, 2019	Dec. 31, 2018
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	$ 72,779	$ 72,281
Total impaired loans	94,767	98,283
Average recorded investment in impaired loans	90,150	84,338
Interest income recognized on impaired loans	1,113	3,762
Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	24,479	27,245
Total impaired loans	33,082	35,723
Average recorded investment in impaired loans	32,386	33,824
Interest income recognized on impaired loans	516	1,656
Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	13,052	15,848
Total impaired loans	19,875	22,508
Average recorded investment in impaired loans	19,696	20,733
Interest income recognized on impaired loans	258	910
Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	7,299	7,075
Total impaired loans	9,079	8,893
Average recorded investment in impaired loans	8,698	9,075
Interest income recognized on impaired loans	166	511
Personal Banking | Consumer finance loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	0	22
Total impaired loans		22
Average recorded investment in impaired loans		24
Interest income recognized on impaired loans		0
Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	4,128	4,300
Total impaired loans	4,128	4,300
Average recorded investment in impaired loans	3,992	3,992
Interest income recognized on impaired loans	92	235
Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	48,300	45,036
Total impaired loans	61,685	62,560
Average recorded investment in impaired loans	57,764	50,514
Interest income recognized on impaired loans	597	2,106
Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	41,278	36,935
Total impaired loans	52,128	49,919
Average recorded investment in impaired loans	48,887	41,328
Interest income recognized on impaired loans	486	1,599
Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	7,022	8,101
Total impaired loans	9,557	12,641
Average recorded investment in impaired loans	8,877	9,186
Interest income recognized on impaired loans	111	507
90 Days or greater delinquent
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	46,093	50,730
90 Days or greater delinquent | Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	19,538	22,211
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	10,781	12,965
90 Days or greater delinquent | Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	5,542	5,996
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		22
90 Days or greater delinquent | Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	3,215	3,228
90 Days or greater delinquent | Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	26,555	28,519
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	24,528	25,509
90 Days or greater delinquent | Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	2,027	3,010
Less than 90 days delinquent
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	26,686	21,551
Loans less than 90 days delinquent reviewed for impairment	4,127	11,002
TDRs less than 90 days delinquent not included elsewhere	17,861	15,000
Less than 90 days delinquent | Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	4,941	5,034
Loans less than 90 days delinquent reviewed for impairment	505	0
TDRs less than 90 days delinquent not included elsewhere	8,098	8,478
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	2,271	2,883
Loans less than 90 days delinquent reviewed for impairment	505	0
TDRs less than 90 days delinquent not included elsewhere	6,318	6,660
Less than 90 days delinquent | Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	1,757	1,079
Loans less than 90 days delinquent reviewed for impairment	0	0
TDRs less than 90 days delinquent not included elsewhere	1,780	1,818
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
Loans less than 90 days delinquent reviewed for impairment		0
TDRs less than 90 days delinquent not included elsewhere		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	913	1,072
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	21,745	16,517
Loans less than 90 days delinquent reviewed for impairment	3,622	11,002
TDRs less than 90 days delinquent not included elsewhere	9,763	6,522
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	16,750	11,426
Loans less than 90 days delinquent reviewed for impairment	3,390	8,549
TDRs less than 90 days delinquent not included elsewhere	7,460	4,435
Less than 90 days delinquent | Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	4,995	5,091
Loans less than 90 days delinquent reviewed for impairment	232	2,453
TDRs less than 90 days delinquent not included elsewhere	$ 2,303	$ 2,087

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, 2019	Dec. 31, 2018
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	$ 8,517,741	$ 7,997,835
Loans individually evaluated for impairment	52,134	53,604
Loans individually evaluated for impairment for which there is a related impairment reserve	47,721	48,875
Related impairment reserve	8,324	8,542
Loans individually evaluated for impairment for which there is no related reserve	4,413	4,729
Personal Banking
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	5,112,570	4,972,298
Loans individually evaluated for impairment	10,058	10,307
Loans individually evaluated for impairment for which there is a related impairment reserve	10,058	10,307
Related impairment reserve	1,329	1,276
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	2,859,252	2,856,359
Loans individually evaluated for impairment	7,909	8,111
Loans individually evaluated for impairment for which there is a related impairment reserve	7,909	8,111
Related impairment reserve	813	747
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	1,322,279	1,256,255
Loans individually evaluated for impairment	2,126	2,167
Loans individually evaluated for impairment for which there is a related impairment reserve	2,126	2,167
Related impairment reserve	510	523
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	2,292	3,817
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	928,747	855,867
Loans individually evaluated for impairment	23	29
Loans individually evaluated for impairment for which there is a related impairment reserve	23	29
Related impairment reserve	6	6
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	3,405,171	3,025,537
Loans individually evaluated for impairment	42,076	43,297
Loans individually evaluated for impairment for which there is a related impairment reserve	37,663	38,568
Related impairment reserve	6,995	7,266
Loans individually evaluated for impairment for which there is no related reserve	4,413	4,729
Commercial Banking | Commercial real estate loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	2,764,907	2,436,605
Loans individually evaluated for impairment	34,402	35,216
Loans individually evaluated for impairment for which there is a related impairment reserve	31,264	31,830
Related impairment reserve	6,249	6,499
Loans individually evaluated for impairment for which there is no related reserve	3,138	3,386
Commercial Banking | Commercial loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	640,264	588,932
Loans individually evaluated for impairment	7,674	8,081
Loans individually evaluated for impairment for which there is a related impairment reserve	6,399	6,738
Related impairment reserve	746	767
Loans individually evaluated for impairment for which there is no related reserve	$ 1,275	$ 1,343

Loans receivable - Roll Forward

Loans receivable - Roll Forward of Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)contract	Mar. 31, 2018USD ($)contract	Dec. 31, 2018USD ($)
Number of contracts
Beginning balance | contract	195	205
Number of contracts new TDRs | contract	0	9
Number of re-modified TDRs | contract	0	0
Ending balance | contract	195	200
Amount
Beginning TDR balance	$ 33,608	$ 32,104
New TDRs	0	4,935
Re-modified TDRs	0	0
Net paydowns	(796)	(947)
Ending TDR balance	32,812	30,966
Accruing TDRs	17,861	19,749
Non-accrual TDRs	$ 14,951	$ 11,217	$ 15,300
Remodified TDRs | contract	0
Residential mortgage loans
Number of contracts
Number of contracts charged off | contract	0	1
Number of contracts paid off | contract	0	1
Amount
Amount of contracts charged off	$ 0	$ (135)
Amount of contracts paid off	$ 0	$ (249)
Home equity loans
Number of contracts
Number of contracts charged off | contract	0	0
Number of contracts paid off | contract	0	1
Amount
Amount of contracts charged off	$ 0	$ 0
Amount of contracts paid off	$ 0	$ (12)
Commercial real estate loans
Number of contracts
Number of contracts charged off | contract	0	1
Number of contracts paid off | contract	0	4
Amount
Amount of contracts charged off	$ 0	$ (203)
Amount of contracts paid off	$ 0	$ (1,574)
Commercial loans
Number of contracts
Number of contracts charged off | contract	0	1
Number of contracts paid off | contract	0	5
Amount
Amount of contracts charged off	$ 0	$ (721)
Amount of contracts paid off	$ 0	$ (2,232)

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
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	9
Recorded investment at the time of modification	$ 4,935
Current recorded investment	4,168
Current allowance	$ 57
Personal Banking
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	5
Recorded investment at the time of modification	$ 354
Current recorded investment	352
Current allowance	$ 57
Personal Banking | Residential mortgage loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2
Recorded investment at the time of modification	$ 214
Current recorded investment	213
Current allowance	$ 21
Personal Banking | Home equity loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3
Recorded investment at the time of modification	$ 140
Current recorded investment	139
Current allowance	$ 36
Commercial Banking
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4
Recorded investment at the time of modification	$ 4,581
Current recorded investment	3,816
Current allowance	$ 0
Commercial Banking | Commercial real estate loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1
Recorded investment at the time of modification	$ 2,401
Current recorded investment	2,385
Current allowance	$ 0
Commercial Banking | Commercial loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3
Recorded investment at the time of modification	$ 2,180
Current recorded investment	1,431
Current allowance	$ 0

Loans receivable - Troubled D_2

Loans receivable - Troubled Debt Restructurings by Type of Modification (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019contract	Mar. 31, 2018USD ($)contract
Troubled debt restructurings
Number of contracts | contract		9
Troubled debt restructurings		$ 4,168
Number of re-modified TDRs | contract	0	0
Rate
Troubled debt restructurings
Troubled debt restructurings		$ 30
Payment
Troubled debt restructurings
Troubled debt restructurings		0
Maturity date
Troubled debt restructurings
Troubled debt restructurings		178
Other
Troubled debt restructurings
Troubled debt restructurings		$ 3,960
Personal Banking
Troubled debt restructurings
Number of contracts | contract		5
Troubled debt restructurings		$ 352
Personal Banking | Rate
Troubled debt restructurings
Troubled debt restructurings		30
Personal Banking | Payment
Troubled debt restructurings
Troubled debt restructurings		0
Personal Banking | Maturity date
Troubled debt restructurings
Troubled debt restructurings		178
Personal Banking | Other
Troubled debt restructurings
Troubled debt restructurings		$ 144
Personal Banking | Residential mortgage loans
Troubled debt restructurings
Number of contracts | contract		2
Troubled debt restructurings		$ 213
Personal Banking | Residential mortgage loans | Rate
Troubled debt restructurings
Troubled debt restructurings		0
Personal Banking | Residential mortgage loans | Payment
Troubled debt restructurings
Troubled debt restructurings		0
Personal Banking | Residential mortgage loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings		178
Personal Banking | Residential mortgage loans | Other
Troubled debt restructurings
Troubled debt restructurings		$ 35
Personal Banking | Home equity loans
Troubled debt restructurings
Number of contracts | contract		3
Troubled debt restructurings		$ 139
Personal Banking | Home equity loans | Rate
Troubled debt restructurings
Troubled debt restructurings		30
Personal Banking | Home equity loans | Payment
Troubled debt restructurings
Troubled debt restructurings		0
Personal Banking | Home equity loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings		0
Personal Banking | Home equity loans | Other
Troubled debt restructurings
Troubled debt restructurings		$ 109
Commercial Banking
Troubled debt restructurings
Number of contracts | contract		4
Troubled debt restructurings		$ 3,816
Commercial Banking | Rate
Troubled debt restructurings
Troubled debt restructurings		0
Commercial Banking | Payment
Troubled debt restructurings
Troubled debt restructurings		0
Commercial Banking | Maturity date
Troubled debt restructurings
Troubled debt restructurings		0
Commercial Banking | Other
Troubled debt restructurings
Troubled debt restructurings		$ 3,816
Commercial Banking | Commercial real estate loans
Troubled debt restructurings
Number of contracts | contract		1
Troubled debt restructurings		$ 2,385
Commercial Banking | Commercial real estate loans | Rate
Troubled debt restructurings
Troubled debt restructurings		0
Commercial Banking | Commercial real estate loans | Payment
Troubled debt restructurings
Troubled debt restructurings		0
Commercial Banking | Commercial real estate loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings		0
Commercial Banking | Commercial real estate loans | Other
Troubled debt restructurings
Troubled debt restructurings		$ 2,385
Commercial Banking | Commercial loans
Troubled debt restructurings
Number of contracts | contract		3
Troubled debt restructurings		$ 1,431
Commercial Banking | Commercial loans | Rate
Troubled debt restructurings
Troubled debt restructurings		0
Commercial Banking | Commercial loans | Payment
Troubled debt restructurings
Troubled debt restructurings		0
Commercial Banking | Commercial loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings		0
Commercial Banking | Commercial loans | Other
Troubled debt restructurings
Troubled debt restructurings		$ 1,431

Loans receivable - Loan Delinqu

Loans receivable - Loan Delinquencies (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Loan payment delinquencies
Total delinquency	$ 133,787	$ 121,534
Current	8,436,088	7,929,905
Total loans	8,569,875	8,051,439
90 days or greater delinquent and accruing	87	143
30-59 Days delinquent
Loan payment delinquencies
Total delinquency	75,482	53,010
60-89 Days delinquent
Loan payment delinquencies
Total delinquency	12,125	17,651
90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	46,180	50,873
Personal Banking
Loan payment delinquencies
Total loans	5,122,628	4,982,605
Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total loans	2,867,161	2,864,470
Personal Banking | Home equity loans
Loan payment delinquencies
Total loans	1,324,405	1,258,422
Personal Banking | Consumer finance loans
Loan payment delinquencies
Total loans	2,292	3,817
Personal Banking | Consumer loans
Loan payment delinquencies
Total loans	928,770	855,896
Commercial Banking
Loan payment delinquencies
Total loans	3,447,247	3,068,834
Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total loans	2,799,309	2,471,821
Commercial Banking | Commercial loans
Loan payment delinquencies
Total loans	647,938	597,013
Originated
Loan payment delinquencies
Total delinquency	115,839	109,605
Current	7,455,020	7,303,580
Total loans	7,570,859	7,413,185
90 days or greater delinquent and accruing	0	0
Originated | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	69,162	49,716
Originated | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	7,351	15,903
Originated | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	39,326	43,986
Originated | Personal Banking
Loan payment delinquencies
Total delinquency	61,751	73,809
Current	4,623,133	4,541,001
Total loans	4,684,884	4,614,810
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total delinquency	36,772	44,645
Current	2,734,070	2,714,474
Total loans	2,770,842	2,759,119
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Home equity loans
Loan payment delinquencies
Total delinquency	12,583	13,406
Current	1,022,606	1,030,472
Total loans	1,035,189	1,043,878
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Consumer finance loans
Loan payment delinquencies
Total delinquency	342	854
Current	1,950	2,963
Total loans	2,292	3,817
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Consumer loans
Loan payment delinquencies
Total delinquency	12,054	14,904
Current	864,507	793,092
Total loans	876,561	807,996
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	38,780	43,716
Originated | Personal Banking | 30-59 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	25,013	27,245
Originated | Personal Banking | 30-59 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	6,440	6,810
Originated | Personal Banking | 30-59 Days delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	295	661
Originated | Personal Banking | 30-59 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	7,032	9,000
Originated | Personal Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	6,375	10,542
Originated | Personal Banking | 60-89 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	2,427	5,732
Originated | Personal Banking | 60-89 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	1,880	1,771
Originated | Personal Banking | 60-89 Days delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	47	172
Originated | Personal Banking | 60-89 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	2,021	2,867
Originated | Personal Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	16,596	19,551
Originated | Personal Banking | 90 Days or greater delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	9,332	11,668
Originated | Personal Banking | 90 Days or greater delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	4,263	4,825
Originated | Personal Banking | 90 Days or greater delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	0	21
Originated | Personal Banking | 90 Days or greater delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	3,001	3,037
Originated | Commercial Banking
Loan payment delinquencies
Total delinquency	54,088	35,796
Current	2,831,887	2,762,579
Total loans	2,885,975	2,798,375
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total delinquency	50,128	31,913
Current	2,255,348	2,217,105
Total loans	2,305,476	2,249,018
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | Commercial loans
Loan payment delinquencies
Total delinquency	3,960	3,883
Current	576,539	545,474
Total loans	580,499	549,357
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	30,382	6,000
Originated | Commercial Banking | 30-59 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	28,064	5,391
Originated | Commercial Banking | 30-59 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	2,318	609
Originated | Commercial Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	976	5,361
Originated | Commercial Banking | 60-89 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	859	4,801
Originated | Commercial Banking | 60-89 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	117	560
Originated | Commercial Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	22,730	24,435
Originated | Commercial Banking | 90 Days or greater delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	21,205	21,721
Originated | Commercial Banking | 90 Days or greater delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	1,525	2,714
Acquired
Loan payment delinquencies
Total delinquency	17,948	11,929
Current	981,068	626,325
Total loans	999,016	638,254
90 days or greater delinquent and accruing	87	143
Acquired | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	6,320	3,294
Acquired | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	4,774	1,748
Acquired | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	6,854	6,887
Acquired | Personal Banking
Loan payment delinquencies
Total delinquency	8,294	6,705
Current	429,450	361,090
Total loans	437,744	367,795
90 days or greater delinquent and accruing	26	65
Acquired | Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total delinquency	4,640	2,542
Current	91,679	91,240
Total loans	96,319	93,782
90 days or greater delinquent and accruing	20	19
Acquired | Personal Banking | Home equity loans
Loan payment delinquencies
Total delinquency	3,129	3,345
Current	286,087	211,199
Total loans	289,216	214,544
90 days or greater delinquent and accruing	0	40
Acquired | Personal Banking | Consumer loans
Loan payment delinquencies
Total delinquency	525	818
Current	51,684	58,651
Total loans	52,209	59,469
90 days or greater delinquent and accruing	6	6
Acquired | Personal Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	4,378	2,818
Acquired | Personal Banking | 30-59 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	2,996	532
Acquired | Personal Banking | 30-59 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	1,186	1,839
Acquired | Personal Banking | 30-59 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	196	447
Acquired | Personal Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	948	1,162
Acquired | Personal Banking | 60-89 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	175	693
Acquired | Personal Banking | 60-89 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	664	294
Acquired | Personal Banking | 60-89 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	109	175
Acquired | Personal Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	2,968	2,725
Acquired | Personal Banking | 90 Days or greater delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	1,469	1,317
Acquired | Personal Banking | 90 Days or greater delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	1,279	1,212
Acquired | Personal Banking | 90 Days or greater delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	220	196
Acquired | Commercial Banking
Loan payment delinquencies
Total delinquency	9,654	5,224
Current	551,618	265,235
Total loans	561,272	270,459
90 days or greater delinquent and accruing	61	78
Acquired | Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total delinquency	7,490	4,564
Current	486,343	218,239
Total loans	493,833	222,803
90 days or greater delinquent and accruing	61	78
Acquired | Commercial Banking | Commercial loans
Loan payment delinquencies
Total delinquency	2,164	660
Current	65,275	46,996
Total loans	67,439	47,656
90 days or greater delinquent and accruing	0	0
Acquired | Commercial Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	1,942	476
Acquired | Commercial Banking | 30-59 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	901	112
Acquired | Commercial Banking | 30-59 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	1,041	364
Acquired | Commercial Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	3,826	586
Acquired | Commercial Banking | 60-89 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	3,205	586
Acquired | Commercial Banking | 60-89 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	621	0
Acquired | Commercial Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	3,886	4,162
Acquired | Commercial Banking | 90 Days or greater delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	3,384	3,866
Acquired | Commercial Banking | 90 Days or greater delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	$ 502	$ 296

Loans receivable - Credit Quali

Loans receivable - Credit Quality Indicators (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Credit quality indicators
Total loans	$ 8,569,875,000	$ 8,051,439,000
Pass
Credit quality indicators
Total loans	8,252,498,000	7,753,667,000
Special mention
Credit quality indicators
Total loans	121,663,000	113,969,000
Substandard
Credit quality indicators
Total loans	195,714,000	183,803,000
Doubtful
Credit quality indicators
Total loans	0	0
Loss
Credit quality indicators
Total loans	0	0
Personal Banking
Credit quality indicators
Total loans	5,122,628,000	4,982,605,000
Personal Banking | Residential mortgage loans
Credit quality indicators
Total loans	2,867,161,000	2,864,470,000
Personal Banking | Home equity loans
Credit quality indicators
Total loans	1,324,405,000	1,258,422,000
Personal Banking | Consumer finance loans
Credit quality indicators
Total loans	2,292,000	3,817,000
Personal Banking | Consumer loans
Credit quality indicators
Total loans	928,770,000	855,896,000
Commercial Banking
Credit quality indicators
Total loans	3,447,247,000	3,068,834,000
Commercial Banking | Commercial real estate loans
Credit quality indicators
Total loans	2,799,309,000	2,471,821,000
Commercial Banking | Commercial loans
Credit quality indicators
Total loans	647,938,000	597,013,000
Originated
Credit quality indicators
Total loans	7,570,859,000	7,413,185,000
Originated | Pass
Credit quality indicators
Total loans	7,294,702,000	7,161,796,000
Originated | Special mention
Credit quality indicators
Total loans	118,260,000	106,902,000
Originated | Substandard
Credit quality indicators
Total loans	157,897,000	144,487,000
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	4,684,884,000	4,614,810,000
Originated | Personal Banking | Pass
Credit quality indicators
Total loans	4,667,887,000	4,595,403,000
Originated | Personal Banking | Special mention
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Substandard
Credit quality indicators
Total loans	16,997,000	19,407,000
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	2,770,842,000	2,759,119,000
Originated | Personal Banking | Residential mortgage loans | Pass
Credit quality indicators
Total loans	2,762,876,000	2,749,266,000
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	7,966,000	9,853,000
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	1,035,189,000	1,043,878,000
Originated | Personal Banking | Home equity loans | Pass
Credit quality indicators
Total loans	1,029,941,000	1,038,245,000
Originated | Personal Banking | Home equity loans | Special mention
Credit quality indicators
Total loans	0	0
Originated | Personal Banking | Home equity loans | Substandard
Credit quality indicators
Total loans	5,248,000	5,633,000
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	2,292,000	3,817,000
Originated | Personal Banking | Consumer finance loans | Pass
Credit quality indicators
Total loans	2,292,000	3,817,000
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	0	0
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	876,561,000	807,996,000
Originated | Personal Banking | Consumer loans | Pass
Credit quality indicators
Total loans	872,778,000	804,075,000
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	3,783,000	3,921,000
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	2,885,975,000	2,798,375,000
Originated | Commercial Banking | Pass
Credit quality indicators
Total loans	2,626,815,000	2,566,393,000
Originated | Commercial Banking | Special mention
Credit quality indicators
Total loans	118,260,000	106,902,000
Originated | Commercial Banking | Substandard
Credit quality indicators
Total loans	140,900,000	125,080,000
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	2,305,476,000	2,249,018,000
Originated | Commercial Banking | Commercial real estate loans | Pass
Credit quality indicators
Total loans	2,113,010,000	2,062,728,000
Originated | Commercial Banking | Commercial real estate loans | Special mention
Credit quality indicators
Total loans	84,164,000	91,142,000
Originated | Commercial Banking | Commercial real estate loans | Substandard
Credit quality indicators
Total loans	108,302,000	95,148,000
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	580,499,000	549,357,000
Originated | Commercial Banking | Commercial loans | Pass
Credit quality indicators
Total loans	513,805,000	503,665,000
Originated | Commercial Banking | Commercial loans | Special mention
Credit quality indicators
Total loans	34,096,000	15,760,000
Originated | Commercial Banking | Commercial loans | Substandard
Credit quality indicators
Total loans	32,598,000	29,932,000
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	999,016,000	638,254,000
Acquired | Pass
Credit quality indicators
Total loans	957,796,000	591,871,000
Acquired | Special mention
Credit quality indicators
Total loans	3,403,000	7,067,000
Acquired | Substandard
Credit quality indicators
Total loans	37,817,000	39,316,000
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	437,744,000	367,795,000
Acquired | Personal Banking | Pass
Credit quality indicators
Total loans	434,275,000	364,852,000
Acquired | Personal Banking | Special mention
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Substandard
Credit quality indicators
Total loans	3,469,000	2,943,000
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	96,319,000	93,782,000
Acquired | Personal Banking | Residential mortgage loans | Pass
Credit quality indicators
Total loans	95,131,000	92,625,000
Acquired | Personal Banking | Residential mortgage loans | Special mention
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Residential mortgage loans | Substandard
Credit quality indicators
Total loans	1,188,000	1,157,000
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	289,216,000	214,544,000
Acquired | Personal Banking | Home equity loans | Pass
Credit quality indicators
Total loans	287,382,000	213,273,000
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	1,834,000	1,271,000
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	52,209,000	59,469,000
Acquired | Personal Banking | Consumer loans | Pass
Credit quality indicators
Total loans	51,762,000	58,954,000
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	447,000	515,000
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	561,272,000	270,459,000
Acquired | Commercial Banking | Pass
Credit quality indicators
Total loans	523,521,000	227,019,000
Acquired | Commercial Banking | Special mention
Credit quality indicators
Total loans	3,403,000	7,067,000
Acquired | Commercial Banking | Substandard
Credit quality indicators
Total loans	34,348,000	36,373,000
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	493,833,000	222,803,000
Acquired | Commercial Banking | Commercial real estate loans | Pass
Credit quality indicators
Total loans	464,166,000	191,622,000
Acquired | Commercial Banking | Commercial real estate loans | Special mention
Credit quality indicators
Total loans	2,889,000	3,546,000
Acquired | Commercial Banking | Commercial real estate loans | Substandard
Credit quality indicators
Total loans	26,778,000	27,635,000
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	67,439,000	47,656,000
Acquired | Commercial Banking | Commercial loans | Pass
Credit quality indicators
Total loans	59,355,000	35,397,000
Acquired | Commercial Banking | Commercial loans | Special mention
Credit quality indicators
Total loans	514,000	3,521,000
Acquired | Commercial Banking | Commercial loans | Substandard
Credit quality indicators
Total loans	7,570,000	8,738,000
Acquired | Commercial Banking | Commercial loans | Doubtful
Credit quality indicators
Total loans	0	0
Acquired | Commercial Banking | Commercial loans | Loss
Credit quality indicators
Total loans	0	$ 0
Minimum | Special mention or substandard
Credit quality indicators
Total loans	$ 1,000,000

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Amortizable intangible assets:
Amortization expense	$ 1,447	$ 1,520
Estimated amortization expense
For the year ending December 31, 2019	6,718
For the year ending December 31, 2020	5,535
For the year ending December 31, 2021	4,438
For the year ending December 31, 2022	3,438
For the year ending December 31, 2023	2,561
For the year ending December 31, 2024	1,876
Core Deposits
Amortizable intangible assets:
Intangible asset - gross	63,685		$ 63,685
Acquisitions	7,498		0
Less: accumulated amortization	(46,324)		(45,027)
Intangible asset - net	24,859		18,658
Customer and Contract
Amortizable intangible assets:
Intangible asset - gross	10,474		10,474
Less: accumulated amortization	(9,461)		(9,311)
Intangible asset - net	$ 1,013		$ 1,163

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Changes in the carrying amount of goodwill
Balance at the beginning of the period	$ 307,420	$ 307,420
Goodwill from acquisition	37,300	0
Balance at the end of the period	$ 344,720	$ 307,420

Borrowed Funds (Details)

Borrowed Funds (Details)	Dec. 15, 2005USD ($)$ / sharesshares	Dec. 05, 2005USD ($)$ / sharesshares	Mar. 31, 2019USD ($)$ / sharesshares	Mar. 08, 2019trust	Mar. 07, 2019trust	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Number of statutory business trusts owned | trust					3
Junior subordinated debentures			$ 121,757,000			$ 111,213,000
Number of additional business trusts owned | trust				2
Trust preferred investments
Debt Instrument [Line Items]
Maximum period for which interest payment on the subordinated debentures can be deferred			5 years
Interest deferral			$ 0
Trust preferred investments | Northwest Bancorp Capital Trust III
Debt Instrument [Line Items]
Cumulative trust preferred securities issued (in shares) | shares		50,000
Cumulative trust preferred securities issued, liquidation value per preferred security (in dollars per security) | $ / shares		$ 1,000
Total value of cumulative trust preferred securities issued		$ 50,000,000
Junior subordinated debentures			$ 51,547,000
Trust preferred investments | Northwest Bancorp Capital Trust III | LIBOR
Debt Instrument [Line Items]
Spread on variable rate basis (as a percent)		1.38%	1.38%
Effective rate (as a percent)			3.97%
Trust preferred investments | Northwest Bancorp Statutory Trust IV
Debt Instrument [Line Items]
Cumulative trust preferred securities issued (in shares) | shares	50,000
Cumulative trust preferred securities issued, liquidation value per preferred security (in dollars per security) | $ / shares	$ 1,000
Total value of cumulative trust preferred securities issued	$ 50,000,000
Junior subordinated debentures			$ 51,547,000
Trust preferred investments | Northwest Bancorp Statutory Trust IV | LIBOR
Debt Instrument [Line Items]
Spread on variable rate basis (as a percent)	1.38%		1.38%
Effective rate (as a percent)			3.99%
Trust preferred investments | Union National Capital Trust I
Debt Instrument [Line Items]
Cumulative trust preferred securities issued (in shares) | shares			8,000
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			$ 8,000,000
Trust preferred investments | Union National Capital Trust I | LIBOR
Debt Instrument [Line Items]
Spread on variable rate basis (as a percent)			2.85%
Trust preferred investments | Union National Capital Trust II
Debt Instrument [Line Items]
Cumulative trust preferred securities issued (in shares) | shares			3,000
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			$ 3,000,000
Trust preferred investments | Union National Capital Trust II | LIBOR
Debt Instrument [Line Items]
Spread on variable rate basis (as a percent)			2.00%
Interest rate swaps | LNB Trust II
Debt Instrument [Line Items]
Cumulative trust preferred securities issued (in shares) | shares			7,875
Cumulative trust preferred securities issued, liquidation value per preferred security (in dollars per security) | $ / shares			$ 1,000
Total value of cumulative trust preferred securities issued			$ 7,875,000
Junior subordinated debentures			$ 8,119,000
Interest rate swaps | LNB Trust II | LIBOR
Debt Instrument [Line Items]
Spread on variable rate basis (as a percent)			1.48%
Effective rate (as a percent)			4.09%
Interest rate swaps | Union National Capital Trust I
Debt Instrument [Line Items]
Junior subordinated debentures			$ 8,248,000
Interest rate swaps | Union National Capital Trust II
Debt Instrument [Line Items]
Junior subordinated debentures			3,093,000
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			250,000,000
Revolving line of credit			16,300,000			128,600,000
Securities Sold under Agreements to Repurchase
Debt Instrument [Line Items]
Securities sold under agreements to repurchase			$ 97,800,000			$ 105,800,000

Guarantees (Details)

Guarantees (Details) - Letter of Credit $ in Thousands	Mar. 31, 2019USD ($)
Guarantor Obligations [Line Items]
Maximum potential amount of future payments	$ 39,300
Maximum exposure collateralized	32,500
Liability recognized for the obligations	$ 287

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Stock options
Antidilutive securities excluded from the calculation of earnings per share
Average share price during the reporting period (in dollars per share)	$ 17.74	$ 16.83

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, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Reported net income	$ 25,044	$ 24,985
Weighted average common shares outstanding (in shares)	103,101,789	101,598,928
Dilutive potential shares due to effect of stock options (in shares)	1,394,803	1,537,569
Total weighted average common shares and dilutive potential shares (in shares)	104,496,592	103,136,497
Basic earnings per share (in dollars per share)	$ 0.24	$ 0.25
Diluted earnings per share (in dollars per share)	$ 0.24	$ 0.24

Pension and Other Post-retire_3

Pension and Other Post-retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension benefits
Components of net periodic benefit cost
Service cost	$ 1,274	$ 1,716
Interest cost	1,827	1,678
Expected return on plan assets	(2,759)	(2,992)
Amortization of prior service cost	(581)	(581)
Amortization of the net loss	855	873
Net periodic cost	616	694
Pension benefits | Minimum
Components of net periodic benefit cost
Estimated contribution for the current year	2,000
Pension benefits | Maximum
Components of net periodic benefit cost
Estimated contribution for the current year	4,000
Other post-retirement benefits
Components of net periodic benefit cost
Service cost	0	0
Interest cost	11	14
Expected return on plan assets	0	0
Amortization of prior service cost	0	0
Amortization of the net loss	17	24
Net periodic cost	$ 28	$ 38

Disclosures About Fair Value _3

Disclosures About Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Significant unrealized appreciation or depreciation in financial instruments	$ 0	$ 0
Financial assets:
Securities available-for-sale	842,657,000	801,450,000
Securities held-to-maturity	21,597,000	22,446,000
Accrued interest receivable	28,107,000	24,490,000
Interest rate swaps	10,537,000	6,445,000
Financial liabilities:
Borrowed funds	114,081,000	234,389,000
Junior subordinated debentures	121,757,000	111,213,000
Interest rate swaps	10,537,000	6,445,000
Level 1
Financial assets:
Cash and cash equivalents	92,924,000	68,789,000
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Loans receivable, net	0	0
Accrued interest receivable	28,107,000	24,490,000
Interest rate swaps		0
FHLB stock	0	0
Total financial assets	121,031,000	93,279,000
Financial liabilities:
Savings and checking deposits	7,065,197,000	6,489,338,000
Time deposits	0	0
Borrowed funds	114,081,000	234,389,000
Junior subordinated debentures	0	0
Accrued interest payable	1,111,000	744,000
Total financial liabilities	7,180,389,000	6,724,471,000
Level 2
Financial assets:
Cash and cash equivalents	0	0
Securities available-for-sale	842,657,000	801,450,000
Securities held-to-maturity	21,597,000	22,446,000
Loans receivable, net	0	0
Accrued interest receivable	0	0
Interest rate swaps		6,445,000
FHLB stock	0	0
Total financial assets	874,791,000	830,341,000
Financial liabilities:
Savings and checking deposits	0	0
Time deposits	0	0
Borrowed funds	0	0
Junior subordinated debentures	0	0
Accrued interest payable	0	0
Total financial liabilities	10,537,000	6,445,000
Level 3
Financial assets:
Cash and cash equivalents	0	0
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Loans receivable, net	8,423,354,000	7,845,313,000
Accrued interest receivable	0	0
Interest rate swaps		0
FHLB stock	0	0
Total financial assets	8,423,354,000	7,845,313,000
Financial liabilities:
Savings and checking deposits	0	0
Time deposits	1,517,324,000	1,434,410,000
Borrowed funds	0	0
Junior subordinated debentures	109,880,000	102,572,000
Accrued interest payable	0	0
Total financial liabilities	1,627,204,000	1,536,982,000
Carrying amount
Financial assets:
Cash and cash equivalents	92,924,000	68,789,000
Securities available-for-sale	842,657,000	801,450,000
Securities held-to-maturity	21,671,000	22,765,000
Loans receivable, net	8,514,154,000	7,996,225,000
Accrued interest receivable	28,107,000	24,490,000
Interest rate swaps		6,445,000
FHLB stock	12,533,000	15,635,000
Total financial assets	9,522,583,000	8,935,799,000
Financial liabilities:
Savings and checking deposits	7,065,197,000	6,489,338,000
Time deposits	1,527,327,000	1,404,841,000
Borrowed funds	114,081,000	234,389,000
Junior subordinated debentures	121,757,000	111,213,000
Accrued interest payable	1,111,000	744,000
Total financial liabilities	8,840,010,000	8,246,970,000
Estimated fair value
Financial assets:
Cash and cash equivalents	92,924,000	68,789,000
Securities available-for-sale	842,657,000	801,450,000
Securities held-to-maturity	21,597,000	22,446,000
Loans receivable, net	8,423,354,000	7,845,313,000
Accrued interest receivable	28,107,000	24,490,000
Interest rate swaps		6,445,000
FHLB stock	12,533,000	15,635,000
Total financial assets	9,431,709,000	8,784,568,000
Financial liabilities:
Savings and checking deposits	7,065,197,000	6,489,338,000
Time deposits	1,517,324,000	1,434,410,000
Borrowed funds	114,081,000	234,389,000
Junior subordinated debentures	109,880,000	102,572,000
Accrued interest payable	1,111,000	744,000
Total financial liabilities	8,818,130,000	8,267,898,000
Interest rate swaps | Level 1
Financial assets:
Interest rate swaps	0
Financial liabilities:
Interest rate swaps	0	0
Interest rate swaps | Level 2
Financial assets:
Interest rate swaps	10,537,000
Financial liabilities:
Interest rate swaps	10,537,000	6,445,000
Interest rate swaps | Level 3
Financial assets:
Interest rate swaps	0
Financial liabilities:
Interest rate swaps	0	0
Interest rate swaps | Carrying amount
Financial assets:
Interest rate swaps	10,537,000
Financial liabilities:
Interest rate swaps	10,537,000	6,445,000
Interest rate swaps | Estimated fair value
Financial assets:
Interest rate swaps	10,537,000
Financial liabilities:
Interest rate swaps	$ 10,537,000	$ 6,445,000

Disclosures About Fair Value _4

Disclosures About Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	$ 842,657	$ 801,450
Interest rate swaps	10,537	6,445
Interest rate swaps	10,537	6,445
Level 1
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Interest rate swaps		0
Total financial assets	121,031	93,279
Level 2
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	842,657	801,450
Interest rate swaps		6,445
Total financial assets	874,791	830,341
Level 3
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Interest rate swaps		0
Total financial assets	8,423,354	7,845,313
Measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis
Total financial assets	853,194	807,895
Total liabilities	10,537	6,445
Measured on recurring basis | Level 1
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 2
Assets and liabilities measured at fair value on a recurring basis
Total financial assets	853,194	807,895
Total liabilities	10,537	6,445
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
Debt securities | Measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	236,792	224,192
Debt securities | Measured on recurring basis | U.S. government and agencies
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	14,848	14,780
Debt securities | Measured on recurring basis | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	188,960	187,335
Debt securities | Measured on recurring basis | States and political subdivisions
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	32,028	21,163
Debt securities | Measured on recurring basis | Corporate
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	956	914
Debt securities | Measured on recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Debt securities | Measured on recurring basis | Level 1 | U.S. government and agencies
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Debt securities | Measured on recurring basis | Level 1 | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Debt securities | Measured on recurring basis | Level 1 | States and political subdivisions
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Debt securities | Measured on recurring basis | Level 1 | Corporate
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Debt securities | Measured on recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	236,792	224,192
Debt securities | Measured on recurring basis | Level 2 | U.S. government and agencies
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	14,848	14,780
Debt securities | Measured on recurring basis | Level 2 | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	188,960	187,335
Debt securities | Measured on recurring basis | Level 2 | States and political subdivisions
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	32,028	21,163
Debt securities | Measured on recurring basis | Level 2 | Corporate
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	956	914
Debt securities | Measured on recurring basis | Level 3
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Debt securities | Measured on recurring basis | Level 3 | U.S. government and agencies
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Debt securities | Measured on recurring basis | Level 3 | Government sponsored enterprises
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Debt securities | Measured on recurring basis | Level 3 | States and political subdivisions
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Debt securities | Measured on recurring basis | Level 3 | Corporate
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Total mortgage-backed securities | Measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	605,865	577,258
Total mortgage-backed securities | Measured on recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Total mortgage-backed securities | Measured on recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	605,865	577,258
Total mortgage-backed securities | Measured on recurring basis | Level 3
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Residential mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	605,865	577,258
Residential mortgage-backed securities | Measured on recurring basis | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	26,379	27,041
Residential mortgage-backed securities | Measured on recurring basis | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	90,852	73,196
Residential mortgage-backed securities | Measured on recurring basis | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	58,900	51,621
Residential mortgage-backed securities | Measured on recurring basis | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	521	528
Residential mortgage-backed securities | Measured on recurring basis | Level 1 | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Residential mortgage-backed securities | Measured on recurring basis | Level 1 | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Residential mortgage-backed securities | Measured on recurring basis | Level 1 | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Residential mortgage-backed securities | Measured on recurring basis | Level 1 | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Residential mortgage-backed securities | Measured on recurring basis | Level 2 | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	26,379	27,041
Residential mortgage-backed securities | Measured on recurring basis | Level 2 | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	90,852	73,196
Residential mortgage-backed securities | Measured on recurring basis | Level 2 | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	58,900	51,621
Residential mortgage-backed securities | Measured on recurring basis | Level 2 | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	521	528
Residential mortgage-backed securities | Measured on recurring basis | Level 3 | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Residential mortgage-backed securities | Measured on recurring basis | Level 3 | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Residential mortgage-backed securities | Measured on recurring basis | Level 3 | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Residential mortgage-backed securities | Measured on recurring basis | Level 3 | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Collateralized mortgage obligations | Measured on recurring basis | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	50,410	52,331
Collateralized mortgage obligations | Measured on recurring basis | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	222,774	207,033
Collateralized mortgage obligations | Measured on recurring basis | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	156,029	165,508
Collateralized mortgage obligations | Measured on recurring basis | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Collateralized mortgage obligations | Measured on recurring basis | Level 1 | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Collateralized mortgage obligations | Measured on recurring basis | Level 1 | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Collateralized mortgage obligations | Measured on recurring basis | Level 1 | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0
Collateralized mortgage obligations | Measured on recurring basis | Level 1 | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Collateralized mortgage obligations | Measured on recurring basis | Level 2 | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	50,410	52,331
Collateralized mortgage obligations | Measured on recurring basis | Level 2 | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	222,774	207,033
Collateralized mortgage obligations | Measured on recurring basis | Level 2 | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	156,029	165,508
Collateralized mortgage obligations | Measured on recurring basis | Level 2 | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Collateralized mortgage obligations | Measured on recurring basis | Level 3 | GNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0
Collateralized mortgage obligations | Measured on recurring basis | Level 3 | FNMA
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Collateralized mortgage obligations | Measured on recurring basis | Level 3 | FHLMC
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0
Collateralized mortgage obligations | Measured on recurring basis | Level 3 | Non-agency
Assets and liabilities measured at fair value on a recurring basis
Residential mortgage-backed securities:	0	0
Interest rate swaps | Measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	10,537	6,445
Interest rate swaps	10,537	6,445
Interest rate swaps | Measured on recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	0	0
Interest rate swaps	0	0
Interest rate swaps | Measured on recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	10,537	6,445
Interest rate swaps	10,537	6,445
Interest rate swaps | Measured on recurring basis | Level 3
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps	0	0
Interest rate swaps	$ 0	$ 0

Disclosures About Fair Value _5

Disclosures About Fair Value of Financial Instruments - Nonrecurring Assets that had Fair Market Values Below the Carrying Amount (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Level 1
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans measured for impairment	$ 0	$ 0
Total financial assets	121,031	93,279
Level 2
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans measured for impairment	0	0
Total financial assets	874,791	830,341
Level 3
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans measured for impairment	8,423,354	7,845,313
Total financial assets	8,423,354	7,845,313
Fair Value, Measurements, Nonrecurring
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Real estate owned	2,345	2,498
Total financial assets	41,742	42,831
Fair Value, Measurements, Nonrecurring | Level 1
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Real estate owned	0	0
Total financial assets	0	0
Fair Value, Measurements, Nonrecurring | Level 2
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Real estate owned	0	0
Total financial assets	0	0
Fair Value, Measurements, Nonrecurring | Level 3
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Real estate owned	2,345	2,498
Total financial assets	41,742	42,831
Loans measured for impairment | Fair Value, Measurements, Nonrecurring
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans measured for impairment	39,397	40,333
Loans measured for impairment | Fair Value, Measurements, Nonrecurring | Level 1
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans measured for impairment	0	0
Loans measured for impairment | Fair Value, Measurements, Nonrecurring | Level 2
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans measured for impairment	0	0
Loans measured for impairment | Fair Value, Measurements, Nonrecurring | Level 3
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans measured for impairment	$ 39,397	$ 40,333

Disclosures About Fair Value _6

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	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Estimated cost to sell | Loans measured for impairment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cost to sell loans measured for impairment	0.100
Estimated cost to sell | Real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cost to sell	0.100
Discount rate | Loans measured for impairment | Discounted cash flow | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cost to sell loans measured for impairment	0.0425
Discount rate | Loans measured for impairment | Discounted cash flow | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cost to sell loans measured for impairment	0.100
Discount rate | Loans measured for impairment | Discounted cash flow | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cost to sell loans measured for impairment	0.0750
Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate owned	$ 2,345	$ 2,498
Loans measured for impairment | Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans measured for impairment	$ 39,397	$ 40,333

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Interest rate swaps	$ 10,537	$ 6,445
Cash Flow Hedging | Interest rate swaps
Derivative [Line Items]
Derivative notional amount	$ 50,000

Derivative Financial Instrume_4

Derivative Financial Instruments - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Asset Derivatives, Notional Amount	$ 261,604	$ 221,919
Asset Derivatives, Fair Value	10,537	6,445
Liability Derivatives, Notional Amount	258,871	221,919
Liability Derivatives, Fair Value	10,537	6,445
Not Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Asset Derivatives, Notional Amount	261,604	221,919
Asset Derivatives, Fair Value	10,537	6,445
Liability Derivatives, Notional Amount	258,871	221,919
Liability Derivatives, Fair Value	$ 10,537	$ 6,445

Derivative Financial Instrume_5

Derivative Financial Instruments - Gain (Loss) on Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Hedging interest rate derivatives:
Increase in interest expense	$ 0
Increase in interest expense		$ 332
Non-hedging swap derivatives:
Increase in other income	$ 0	$ 129

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Changes in accumulated other comprehensive income by component
Balance beginning of the period	$ 1,257,638	$ 1,207,724
Reclassification due to adoption of ASU No. 2016-02		(6,746)
Other comprehensive income before reclassification adjustments	4,452	(3,595)
Amounts reclassified from accumulated other comprehensive income	209	200
Other comprehensive income/(loss)	4,661	(3,395)
Net other comprehensive income/(loss)		(10,141)
Balance end of the period	1,316,276	1,215,254
Reclassification adjustment for gains included in net income, net of tax	0	26
Reclassification adjustment for gains included in net income, tax	0	(7)
Reclassification adjustment for prior period service costs included in net income, tax	82	90
Unrealized gains and (losses) on securities available- for-sale
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(6,832)	(4,409)
Reclassification due to adoption of ASU No. 2016-02		(991)
Other comprehensive income before reclassification adjustments	4,452	(3,955)
Amounts reclassified from accumulated other comprehensive income	0	(26)
Other comprehensive income/(loss)	4,452
Net other comprehensive income/(loss)		(4,972)
Balance end of the period	(2,380)	(9,381)
Reclassification adjustment for gains included in net income, net of tax		33
Reclassification adjustment for gains included in net income, tax		(7)
Change in fair value of interest rate swaps
Changes in accumulated other comprehensive income by component
Balance beginning of the period	0
Other comprehensive income before reclassification adjustments	0
Amounts reclassified from accumulated other comprehensive income	0
Other comprehensive income/(loss)	0
Balance end of the period	0
Change in fair value of interest rate swaps
Changes in accumulated other comprehensive income by component
Balance beginning of the period		(691)
Reclassification due to adoption of ASU No. 2016-02		(149)
Other comprehensive income before reclassification adjustments		360
Amounts reclassified from accumulated other comprehensive income		0
Net other comprehensive income/(loss)		211
Balance end of the period		(480)
Change in defined benefit pension plans
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(32,864)	(26,980)
Reclassification due to adoption of ASU No. 2016-02		(5,606)
Other comprehensive income before reclassification adjustments	0	0
Amounts reclassified from accumulated other comprehensive income	209	226
Other comprehensive income/(loss)	209
Net other comprehensive income/(loss)		(5,380)
Balance end of the period	(32,655)	(32,360)
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	(872)	(897)
Reclassification adjustment for prior period service costs included in net income, tax	82	90
Total
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(39,696)	(32,080)
Reclassification due to adoption of ASU No. 2016-02		(6,746)
Other comprehensive income/(loss)	4,661	(3,395)
Balance end of the period	$ (35,035)	$ (42,221)

Uncategorized Items - nwbi-2019

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (1,570,000)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (1,570,000)