Northwest Bancshares (NWBI) 10-Q 8 Nov 19 2019 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-34582
Entity Registrant Name	NORTHWEST BANCSHARES, INC.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	27-0950358
Entity Address, Address Line One	100 Liberty Street
Entity Address, City or Town	Warren,
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	16365
City Area Code	814
Local Phone Number	726-2140
Entity Shell Company	false
Title of 12(b) Security	Common Stock, 0.01 Par Value
Trading Symbol	NWBI
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding (in shares)		106,672,637
Entity Central Index Key	0001471265
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 107,602	$ 68,789
Marketable securities available-for-sale (amortized cost of $801,465 and $811,015, respectively)	807,823	801,450
Marketable securities held-to-maturity (fair value of $19,237 and $22,446, respectively)	18,958	22,765
Total cash and cash equivalents and marketable securities	934,383	893,004
Total loans	8,852,017	8,051,439
Allowance for loan losses	(52,859)	(55,214)
Loans receivable, net	8,799,158	7,996,225
Federal Home Loan Bank stock, at cost	21,401	15,635
Accrued interest receivable	27,069	24,490
Real estate owned, net	1,237	2,498
Premises and equipment, net	148,796	143,390
Bank-owned life insurance	187,971	171,079
Goodwill	344,720	307,420
Other intangible assets	22,410	19,821
Other assets	93,329	34,211
Total assets	10,580,474	9,607,773
Liabilities:
Noninterest-bearing demand deposits	1,905,650	1,736,156
Interest-bearing demand deposits	1,678,644	1,455,460
Money market deposit accounts	1,828,001	1,661,623
Savings deposits	1,635,754	1,636,099
Time deposits	1,633,451	1,404,841
Total deposits	8,681,500	7,894,179
Borrowed funds	255,257	234,389
Junior subordinated debentures	121,787	111,213
Advances by borrowers for taxes and insurance	24,331	43,298
Accrued interest payable	1,314	744
Other liabilities	144,515	66,312
Total liabilities	9,228,704	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, 106,658,067 and 103,354,030 shares issued and outstanding, respectively	1,067	1,034
Paid-in capital	801,382	745,926
Retained earnings	577,018	550,374
Accumulated other comprehensive loss	(27,697)	(39,696)
Total shareholders’ equity	1,351,770	1,257,638
Total liabilities and shareholders’ equity	10,580,474	9,607,773
Personal Banking
Assets
Total loans	5,318,599	4,982,605
Commercial Banking
Assets
Total loans	3,533,418	3,068,834
Residential mortgage loans | Personal Banking
Assets
Residential mortgage loans held-for-sale	8,859	0
Total loans	2,887,274	2,864,470
Home equity loans | Personal Banking
Assets
Total loans	1,328,173	1,258,422
Consumer loans | Personal Banking
Assets
Total loans	1,094,293	859,713
Commercial real estate loans | Commercial Banking
Assets
Total loans	2,812,839	2,471,821
Commercial loans | Commercial Banking
Assets
Total loans	$ 720,579	$ 597,013

CONSOLIDATED STATEMENTS OF FI_2

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Marketable securities available-for-sale, amortized cost	$ 801,465	$ 811,015
Marketable securities held-to-maturity, fair value	$ 19,237	$ 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)	106,658,067	103,354,030
Common stock, shares outstanding (in shares)	106,658,067	103,354,030

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income:
Loans receivable	$ 101,091	$ 90,733	$ 296,943	$ 264,059
Mortgage-backed securities	4,188	3,572	12,433	9,839
Taxable investment securities	884	814	2,718	2,140
Tax-free investment securities	224	205	643	908
Federal Home Loan Bank stock dividends	307	119	794	301
Interest-earning deposits	172	162	431	766
Total interest income	106,866	95,605	313,962	278,013
Interest expense:
Deposits	13,694	8,233	36,323	22,000
Borrowed funds	2,236	1,555	6,118	4,203
Total interest expense	15,930	9,788	42,441	26,203
Net interest income	90,936	85,817	271,521	251,810
Provision for loan losses	3,302	6,982	14,436	16,540
Net interest income after provision for loan losses	87,634	78,835	257,085	235,270
Noninterest income:
Gain on sale of loans	826	0	826	0
Gain on sale of investments	0	0	23	153
Service charges and fees	13,558	13,158	38,940	37,965
Trust and other financial services income	4,609	4,254	13,248	12,335
Insurance commission income	1,887	2,046	6,210	6,885
Loss on real estate owned, net	(227)	(247)	(139)	(617)
Income from bank-owned life insurance	1,095	1,460	3,297	4,783
Mortgage banking income	1,921	82	2,325	383
Other operating income	2,500	1,804	6,464	6,567
Total noninterest income	26,169	22,557	71,194	68,454
Noninterest expense:
Compensation and employee benefits	40,816	37,535	121,012	113,076
Premises and occupancy costs	7,061	6,821	21,666	20,952
Office operations	3,197	3,508	10,036	10,684
Collections expense	747	483	1,994	1,429
Processing expenses	11,122	9,620	32,190	28,886
Marketing expenses	1,373	1,949	5,988	6,103
Federal deposit insurance premiums	(702)	721	685	2,109
Professional services	3,032	2,368	8,754	7,464
Amortization of intangible assets	1,702	1,462	4,909	4,502
Real estate owned expense	119	205	406	630
Restructuring/acquisition expense	23	186	3,054	579
Other expenses	2,106	1,759	8,838	7,411
Total noninterest expense	70,596	66,617	219,532	203,825
Income before income taxes	43,207	34,775	108,747	99,899
Federal and state income taxes expense	9,793	7,035	23,906	20,875
Net income	$ 33,414	$ 27,740	$ 84,841	$ 79,024
Basic earnings per share (in dollars per share)	$ 0.32	$ 0.27	$ 0.81	$ 0.78
Diluted earnings per share (in dollars per share)	$ 0.31	$ 0.27	$ 0.80	$ 0.76

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 33,414	$ 27,740	$ 84,841	$ 79,024
Net unrealized holding gains/(losses) on marketable securities:
Unrealized holding gains/(losses) net of tax of ($525), $788, ($4,549), $2,869, respectively	1,315	(1,970)	11,376	(7,169)
Reclassification adjustment for gains included in net income, net of tax of $0, $17, $1 and $54, respectively	(1)	(44)	(3)	(138)
Net unrealized holding gains/(losses) on marketable securities	1,314	(2,014)	11,373	(7,307)
Change in fair value of interest rate swaps, net of tax of $0, ($51), $0 and ($204), respectively	0		0
Change in fair value of interest rate swaps, net of tax of $0, ($51), $0 and ($204), respectively		192		766
Defined benefit plan:
Reclassification adjustments for prior period service costs and net losses included in net income, net of tax of ($83), ($90), ($250) and ($271), respectively	208	226	626	678
Other comprehensive income/(loss)	1,522	(1,596)	11,999	(5,863)
Total comprehensive income	$ 34,936	$ 26,144	$ 96,840	$ 73,161

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Unrealized holding gains (losses), tax	$ (525)	$ (4,549)
Reclassification adjustment for gains included in net income, tax	0	1
Change in fair value of interest rate swaps. tax	0	0
Reclassification adjustments for prior period service costs and net losses included in net income, tax	$ (83)	$ (250)

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. 2018-02	(6,746)			6,746	(6,746)
Comprehensive income:
Net income	79,024			79,024
Other comprehensive income, net	(5,863)				(5,863)
Total comprehensive income	73,161			85,770	(12,609)
Exercise of stock options (in shares)		674,538
Exercise of stock options	7,602	$ 7	7,595
Stock-based compensation expense (in shares)		414,330
Stock-based compensation expense	4,548	$ 4	4,544
Stock-based compensation forfeited (in shares)		(190,216)
Stock-based compensation forfeited	0	$ (5)	5
Dividends paid	(52,359)			(52,359)
Balance end of period (in shares) at Sep. 30, 2018		103,293,480
Balance end of the period at Sep. 30, 2018	1,240,676	$ 1,033	742,863	541,469	(44,689)
Balance beginning of the period (in shares) at Jun. 30, 2018		103,122,890
Balance beginning of the period at Jun. 30, 2018	1,228,880	$ 1,031	739,673	531,269	(43,093)
Comprehensive income:
Net income	27,740			27,740
Other comprehensive income, net	(1,596)				(1,596)
Total comprehensive income	26,144			27,740	(1,596)
Exercise of stock options (in shares)		178,109
Exercise of stock options	1,920	$ 2	1,918
Stock-based compensation expense (in shares)		0
Stock-based compensation expense	1,272	$ 0	1,272
Stock-based compensation forfeited (in shares)		(7,519)
Stock-based compensation forfeited	0	$ 0	0
Dividends paid	(17,540)			(17,540)
Balance end of period (in shares) at Sep. 30, 2018		103,293,480
Balance end of the period at Sep. 30, 2018	1,240,676	$ 1,033	742,863	541,469	(44,689)
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	84,841			84,841
Other comprehensive income, net	11,999				11,999
Total comprehensive income	96,840			84,841	11,999
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)		609,722
Exercise of stock options	6,783	$ 6	6,777
Stock-based compensation expense (in shares)		281,100
Stock-based compensation expense	5,418	$ 3	5,415
Stock-based compensation forfeited (in shares)		(49,158)
Stock-based compensation forfeited	0	$ 0	0
Dividends paid	(56,971)			(56,971)
Balance end of period (in shares) at Sep. 30, 2019		106,658,067
Balance end of the period at Sep. 30, 2019	1,351,770	$ 1,067	801,382	577,018	(27,697)
Balance beginning of the period (in shares) at Jun. 30, 2019		106,614,607
Balance beginning of the period at Jun. 30, 2019	1,333,588	$ 1,066	798,942	562,799	(29,219)
Comprehensive income:
Net income	33,414			33,414
Other comprehensive income, net	1,522				1,522
Total comprehensive income	34,936			33,414	1,522
Exercise of stock options (in shares)		61,867
Exercise of stock options	757	$ 1	756
Stock-based compensation expense (in shares)		0
Stock-based compensation expense	1,684	$ 0	1,684
Stock-based compensation forfeited (in shares)		(18,407)
Stock-based compensation forfeited	0
Dividends paid	(19,195)			(19,195)
Balance end of period (in shares) at Sep. 30, 2019		106,658,067
Balance end of the period at Sep. 30, 2019	$ 1,351,770	$ 1,067	$ 801,382	$ 577,018	$ (27,697)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]
Other comprehensive income, tax	$ (608)	$ 664	$ (4,799)	$ 2,448
Dividends paid, per share (in dollars per share)	$ 0.18	$ 0.17	$ 0.53	$ 0.51

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net income	$ 84,841	$ 79,024
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	14,436	16,540
Net gain/(loss) on sale of assets	(490)	1,758
Net depreciation, amortization and accretion	927	7,598
Increase in other assets	(64,306)	(8,952)
Increase in other liabilities	74,974	48
Net amortization on marketable securities	677	1,317
Noncash write-down of real estate owned	548	1,281
Deferred income tax expense	1,706	22
Origination of loans held-for-sale	(31,776)	(1,297)
Proceeds from sale of loans held-for-sale	23,764	4,501
Noncash compensation expense related to stock benefit plans	5,418	4,548
Net cash provided by operating activities	110,719	106,388
Investing activities:
Purchase of marketable securities available-for-sale	(123,655)	(215,242)
Proceeds from maturities and principal reductions of marketable securities held-to-maturity	3,788	5,439
Proceeds from maturities and principal reductions of marketable securities available-for-sale	178,775	179,640
Proceeds from sale of marketable securities available-for-sale	32,389	5,206
Proceeds from bank-owned life insurance	2,638	357
Loan originations	(2,724,061)	(2,256,146)
Proceeds from loan maturities and principal reductions	2,288,521	2,036,656
Proceeds from sale of loans held for investment	46,783	0
Net proceeds of Federal Home Loan Bank stock	(5,313)	(3,719)
Proceeds from sale of real estate owned	3,274	5,082
Sale of real estate owned for investment, net	456	455
Purchase of premises and equipment	(9,302)	(3,438)
Acquisitions, net of cash received	(25,834)	0
Net cash used in investing activities	(331,541)	(245,710)
Financing activities:
Increase in deposits, net	307,942	126,964
Net increase in short-term borrowings	20,868	70,879
Increase in advances by borrowers for taxes and insurance	(18,987)	(17,528)
Cash dividends paid	(56,971)	(52,359)
Proceeds from stock options exercised	6,783	7,602
Net cash provided by financing activities	259,635	135,558
Net increase in cash and cash equivalents	38,813	(3,764)
Cash and cash equivalents at beginning of period	68,789	77,710
Cash and cash equivalents at end of period	107,602	73,946
Cash paid during the period for:
Interest on deposits and borrowings (including interest credited to deposit accounts of $32,893 and $20,927, respectively)	39,632	26,036
Income taxes	15,052	19,299
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	4,349	5,034
Sale of real estate owned financed by the Company	$ 44	$ 183

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Statement of Cash Flows [Abstract]
Interest on deposits and borrowings, interest credited to deposit accounts	$ 32,893	$ 20,927

Basis of Presentation and Infor

Basis of Presentation and Informational Disclosures	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 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 On May 22, 2019 , the Company awarded employees 547,410 stock options and directors 64,800 stock options with an exercise price of $17.27 and grant date fair value of $1.14 per stock option, and the Company awarded employees 256,800 restricted common shares and directors 24,300 restricted common shares with a grant date fair value of $17.27 . Awarded stock options and common shares vest over a seven-year period with the first vesting occurring on the grant date. Stock-based compensation expense of $1.7 million and $1.3 million for the quarters ended September 30, 2019 and 2018 , and $5.4 million and $4.5 million for the nine months ended September 30, 2019 and 2018 , respectively, was recognized in compensation expense relating to our stock benefit plans. At September 30, 2019 , there was compensation expense of $3.8 million to be recognized for awarded but unvested stock options and $18.5 million for unvested common shares. Income Taxes-Uncertain Tax Positions Accounting standards prescribe a comprehensive model for how a company should recognize, measure, present and disclose in its financial statements uncertain tax positions that the company has taken or expects to take on a tax return. A tax benefit from an uncertain position may be recognized only if it is “more likely than not” that the position is sustainable, based on its technical merits. The tax benefit of a qualifying position is the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement with a taxing authority having full knowledge of all relevant information. At September 30, 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 and 2016 . 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 recognizes 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 approximately $40.2 million , an operating lease liability of approximately $42.2 million and a cumulative-effect adjustment on retained earnings of $1.2 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. The working group meets periodically to discuss the progress of implementations, monitor the established timeline and discuss latest hot topics and industry trends. We have engaged with a third party to assist in the development of certain portfolio-level estimation methodologies and have chosen, and are in the process of implementing, a third-party software platform provider. We have finalized and documented the portfolio segmentation and methodologies that will be utilized. The model validation process has begun. Management has made decisions on reasonable and supportable forecast period and reversion method. Management is currently developing controls, processes, policies and disclosures in preparation for performing a full end to end parallel run. 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.”

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 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 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 $3.1 million during the nine months ended September 30, 2019 , which includes technology and communications costs, professional services, marketing and advertising, and other noninterest expenses.

Leases

Leases	9 Months Ended
	Sep. 30, 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 For the nine months ended September 30, 2019 Operating lease costs (office operations) $ 1,443 4,124 Variable lease costs (office operations) 264 455 Total operating lease costs $ 1,707 4,579 Amounts reported in the consolidated statements of financial condition were as follows (in thousands): Operating leases: As of September 30, 2019 Operating lease ROU assets (other assets) $ 48,857 Operating lease liabilities (other liabilities) 51,531 Other information related to leases as of September 30, 2019 were as follows (in thousands): Supplemental cash flow information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flow from operating leases $ 4,132 ROU assets obtained in exchange for lease obligations $ 11,518 Weighted average remaining lease term 15.7 years Weighted average discount rate 3.7 % 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 September 30, 2019 2019 $ 1,444 2020 5,447 2021 5,115 2022 4,814 2023 4,559 Thereafter 49,087 Total lease payments 70,466 Less amount of lease payments representing interest 18,935 Total present value of lease payments $ 51,531 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 impai

Investment securities and impairment of investment securities	9 Months Ended
	Sep. 30, 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 September 30, 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 less than one year $ 14,902 63 — 14,965 Debt issued by government sponsored enterprises: Due in less than one year 55,099 260 (6 ) 55,353 Due in one year through five years 60,922 116 (340 ) 60,698 Due in five years through ten years 3,830 66 (114 ) 3,782 Municipal securities: Due in less than one year 245 1 — 246 Due in one year through five years 3,799 81 — 3,880 Due in five years through ten years 11,052 154 — 11,206 Due after ten years 13,741 317 — 14,058 Corporate debt issues: Due in five years through ten years 918 — — 918 Residential mortgage-backed securities: Fixed rate pass-through 143,419 2,041 (1,065 ) 144,395 Variable rate pass-through 20,063 834 (4 ) 20,893 Fixed rate agency CMOs 415,760 5,026 (1,190 ) 419,596 Variable rate agency CMOs 57,715 236 (118 ) 57,833 Total residential mortgage-backed securities 636,957 8,137 (2,377 ) 642,717 Total marketable securities available-for-sale $ 801,465 9,195 (2,837 ) 807,823 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 less than one year 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 less than one year 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 September 30, 2019 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through $ 2,317 86 — 2,403 Variable rate pass-through 1,317 36 — 1,353 Fixed rate agency CMOs 14,711 148 — 14,859 Variable rate agency CMOs 613 9 — 622 Total residential mortgage-backed securities 18,958 279 — 19,237 Total marketable securities held-to-maturity $ 18,958 279 — 19,237 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 September 30, 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 $ — — 67,610 (460 ) 67,610 (460 ) Municipal securities — — — — — — Residential mortgage-backed securities - agency 79,196 (287 ) 123,883 (2,090 ) 203,079 (2,377 ) Total temporarily impaired securities $ 79,196 (287 ) 191,493 (2,550 ) 270,689 (2,837 ) 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 quarters ended September 30, (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 September 30, $ — — (1) The beginning balance represents credit losses included in other-than-temporary impairment charges recognized on debt securities in prior periods.

Loans receivable

Loans receivable	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Loans receivable	Loans receivable The following table shows a summary of our loans receivable at September 30, 2019 and December 31, 2018 (in thousands): September 30, 2019 December 31, 2018 Originated Acquired Total Originated Acquired Total Personal Banking: Residential mortgage loans (1) $ 2,804,792 87,176 2,891,968 2,766,430 93,782 2,860,212 Home equity loans 1,069,906 258,267 1,328,173 1,043,878 214,544 1,258,422 Consumer finance loans (2) 872 — 872 3,817 — 3,817 Consumer loans 1,022,976 39,731 1,062,707 775,378 58,671 834,049 Total Personal Banking 4,898,546 385,174 5,283,720 4,589,503 366,997 4,956,500 Commercial Banking: Commercial real estate loans 2,558,688 443,075 3,001,763 2,416,047 223,327 2,639,374 Commercial loans 717,644 60,438 778,082 612,962 48,816 661,778 Total Commercial Banking 3,276,332 503,513 3,779,845 3,029,009 272,143 3,301,152 Total loans receivable, gross 8,174,878 888,687 9,063,565 7,618,512 639,140 8,257,652 Deferred loan costs 49,921 534 50,455 36,820 798 37,618 Allowance for loan losses (47,417 ) (5,442 ) (52,859 ) (51,751 ) (3,463 ) (55,214 ) Undisbursed loan proceeds: Residential mortgage loans (15,576 ) — (15,576 ) (11,513 ) — (11,513 ) Commercial real estate loans (184,634 ) (4,290 ) (188,924 ) (167,029 ) (524 ) (167,553 ) Commercial loans (56,357 ) (1,146 ) (57,503 ) (63,605 ) (1,160 ) (64,765 ) Total loans receivable, net $ 7,920,815 878,343 8,799,158 7,361,434 634,791 7,996,225 (1) Includes $8.9 million and $0 of loans held-for-sale at September 30, 2019 and December 31, 2018 , respectively. (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): September 30, 2019 December 31, 2018 Acquired loans evaluated individually for future credit losses: Outstanding principal balance $ 7,616 8,189 Carrying value 5,150 5,690 Acquired loans evaluated collectively for future credit losses: Outstanding principal balance 889,065 637,170 Carrying value 878,635 632,564 Total acquired loans: Outstanding principal balance 896,681 645,359 Carrying value 883,785 638,254 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 (382 ) Net reclassification from nonaccretable yield 938 Balance at September 30, 2019 $ 1,311 The following table provides information related to acquired impaired loans by portfolio segment and by class of financing receivable at and for the nine months ended September 30, 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 $ 908 1,516 3 949 78 Home equity loans 739 1,651 16 874 89 Consumer loans 10 40 1 19 11 Total Personal Banking 1,657 3,207 20 1,842 178 Commercial Banking: Commercial real estate loans 3,415 4,324 2 3,500 201 Commercial loans 78 85 — 78 3 Total Commercial Banking 3,493 4,409 2 3,578 204 Total $ 5,150 7,616 22 5,420 382 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 September 30, 2019 (in thousands): Balance as of September 30, 2019 Current period provision Charge-offs Recoveries Balance as of Originated loans Personal Banking: Residential mortgage loans $ 2,507 (1,361 ) (109 ) 68 3,909 Home equity loans 2,791 (81 ) (176 ) 58 2,990 Consumer finance loans 140 (141 ) (59 ) 74 266 Consumer loans 12,035 3,920 (2,916 ) 531 10,500 Total Personal Banking 17,473 2,337 (3,260 ) 731 17,665 Commercial Banking: Commercial real estate loans 20,215 (1,206 ) (261 ) 720 20,962 Commercial loans 9,729 958 (1,118 ) 87 9,802 Total Commercial Banking 29,944 (248 ) (1,379 ) 807 30,764 Total originated loans 47,417 2,089 (4,639 ) 1,538 48,429 Acquired loans Personal Banking: Residential mortgage loans 92 41 (81 ) 28 104 Home equity loans 295 220 (290 ) 21 344 Consumer loans 554 63 (103 ) 83 511 Total Personal Banking 941 324 (474 ) 132 959 Commercial Banking: Commercial real estate loans 3,622 1,155 (128 ) 24 2,571 Commercial loans 879 (266 ) (33 ) 30 1,148 Total Commercial Banking 4,501 889 (161 ) 54 3,719 Total acquired loans 5,442 1,213 (635 ) 186 4,678 Total $ 52,859 3,302 (5,274 ) 1,724 53,107 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the quarter ended September 30, 2018 (in thousands): Balance as of September 30, 2018 Current period provision Charge-offs Recoveries Balance as of Originated loans Personal Banking: Residential mortgage loans $ 4,144 491 (204 ) 200 3,657 Home equity loans 3,234 (351 ) (323 ) 69 3,839 Consumer finance loans 1,650 (437 ) (445 ) 178 2,354 Consumer loans 11,021 4,023 (3,392 ) 630 9,760 Total Personal Banking 20,049 3,726 (4,364 ) 1,077 19,610 Commercial Banking: Commercial real estate loans 25,694 8,723 (4,820 ) 772 21,019 Commercial loans 5,730 (3,945 ) (914 ) 80 10,509 Total Commercial Banking 31,424 4,778 (5,734 ) 852 31,528 Total originated loans 51,473 8,504 (10,098 ) 1,929 51,138 Acquired loans Personal Banking: Residential mortgage loans 102 (70 ) (10 ) 12 170 Home equity loans 408 (173 ) (103 ) 22 662 Consumer loans 444 (448 ) (78 ) 55 915 Total Personal Banking 954 (691 ) (191 ) 89 1,747 Commercial Banking: Commercial real estate loans 2,876 (532 ) (39 ) 25 3,422 Commercial loans 672 (299 ) (71 ) 17 1,025 Total Commercial Banking 3,548 (831 ) (110 ) 42 4,447 Total acquired loans 4,502 (1,522 ) (301 ) 131 6,194 Total $ 55,975 6,982 (10,399 ) 2,060 57,332 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the nine months ended September 30, 2019 (in thousands): Balance as of September 30, 2019 Current period provision Charge-offs Recoveries Balance as of December 31, 2018 Originated loans Personal Banking: Residential mortgage loans $ 2,507 (991 ) (847 ) 291 4,054 Home equity loans 2,791 36 (536 ) 107 3,184 Consumer finance loans 140 (561 ) (296 ) 321 676 Other consumer loans 12,035 8,298 (8,196 ) 1,529 10,404 Total Personal Banking 17,473 6,782 (9,875 ) 2,248 18,318 Commercial Banking: Commercial real estate loans 20,215 (2,177 ) (4,978 ) 991 26,379 Commercial loans 9,729 4,769 (2,449 ) 355 7,054 Total Commercial Banking 29,944 2,592 (7,427 ) 1,346 33,433 Total originated loans 47,417 9,374 (17,302 ) 3,594 51,751 Acquired loans Personal Banking: Residential mortgage loans 92 50 (97 ) 56 83 Home equity loans 295 249 (472 ) 170 348 Other consumer loans 554 131 (173 ) 177 419 Total Personal Banking 941 430 (742 ) 403 850 Commercial Banking: Commercial real estate loans 3,622 1,432 (382 ) 576 1,996 Commercial loans 879 3,200 (3,059 ) 121 617 Total Commercial Banking 4,501 4,632 (3,441 ) 697 2,613 Total acquired loans 5,442 5,062 (4,183 ) 1,100 3,463 Total $ 52,859 14,436 (21,485 ) 4,694 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 nine months ended September 30, 2018 (in thousands): Balance as of September 30, 2018 Current period provision Charge-offs Recoveries Balance as of December 31, 2017 Originated loans Personal Banking: Residential mortgage loans $ 4,144 678 (710 ) 352 3,824 Home equity loans 3,234 (164 ) (866 ) 192 4,072 Consumer finance loans 1,650 (469 ) (2,484 ) 635 3,968 Other consumer loans 11,021 9,845 (9,192 ) 1,893 8,475 Total Personal Banking 20,049 9,890 (13,252 ) 3,072 20,339 Commercial Banking: Commercial real estate loans 25,694 10,417 (5,702 ) 1,068 19,911 Commercial loans 5,730 (2,912 ) (2,053 ) 373 10,322 Total Commercial Banking 31,424 7,505 (7,755 ) 1,441 30,233 Total originated loans 51,473 17,395 (21,007 ) 4,513 50,572 Acquired loans Personal Banking: Residential mortgage loans 102 (38 ) (94 ) 103 131 Home equity loans 408 85 (578 ) 139 762 Other consumer loans 444 (363 ) (209 ) 126 890 Total Personal Banking 954 (316 ) (881 ) 368 1,783 Commercial Banking: Commercial real estate loans 2,876 (688 ) (147 ) 162 3,549 Commercial loans 672 149 (448 ) 80 891 Total Commercial Banking 3,548 (539 ) (595 ) 242 4,440 Total acquired loans 4,502 (855 ) (1,476 ) 610 6,223 Total $ 55,975 16,540 (22,483 ) 5,123 56,795 The following table provides information related to the loan portfolio by portfolio segment and by class of financing receivable at September 30, 2019 (in thousands): Total loans receivable Allowance for loan losses Nonaccrual loans (1) Loans 90 days past maturity and accruing TDRs Allowance related to TDRs Additional commitments to customers with loans classified as TDRs Personal Banking: Residential mortgage loans $ 2,896,133 2,599 13,417 — 7,453 565 — Home equity loans 1,328,173 3,086 7,111 — 1,929 394 26 Consumer finance loans 872 140 1 35 — — — Consumer loans 1,093,421 12,589 4,139 50 — — — Total Personal Banking 5,318,599 18,414 24,668 85 9,382 959 26 Commercial Banking: Commercial real estate loans 2,812,839 23,837 31,427 — 17,840 1,398 475 Commercial loans 720,579 10,608 9,562 — 3,078 650 170 Total Commercial Banking 3,533,418 34,445 40,989 — 20,918 2,048 645 Total $ 8,852,017 52,859 65,657 85 30,300 3,007 671 (1) Includes $9.1 million of nonaccrual TDRs. 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 90 days past maturity and accruing 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. The following table provides information related to the composition of originated impaired loans by portfolio segment and by class of financing receivable at and for the nine months ended September 30, 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 $ 11,722 1,695 505 6,048 19,970 19,522 608 Home equity loans 5,966 1,145 — 1,595 8,706 8,709 348 Consumer finance loan 1 — — — 1 — — Consumer loans 3,399 740 — — 4,139 3,744 180 Total Personal Banking 21,088 3,580 505 7,643 32,816 31,975 1,136 Commercial Banking: Commercial real estate loans 22,292 9,135 4,897 8,198 44,522 45,828 1,295 Commercial loans 5,741 3,821 397 1,508 11,467 10,099 319 Total Commercial Banking 28,033 12,956 5,294 9,706 55,989 55,927 1,614 Total $ 49,121 16,536 5,799 17,349 88,805 87,902 2,750 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 September 30, 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 September 30, 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 $ 2,888,290 7,843 7,843 566 — Home equity loans 1,326,245 1,928 1,928 394 — Consumer finance loans 872 — — — — Consumer loans 1,093,408 13 13 3 — Total Personal Banking 5,308,815 9,784 9,784 963 — Commercial Banking: Commercial real estate loans 2,780,752 32,087 28,375 3,142 3,712 Commercial loans 711,670 8,909 7,453 905 1,456 Total Commercial Banking 3,492,422 40,996 35,828 4,047 5,168 Total $ 8,801,237 50,780 45,612 5,010 5,168 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 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 tables provide a roll forward of TDRs for the periods indicated (in thousands): For the quarter ended September 30, 2019 2018 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 183 $ 31,269 205 $ 30,662 New TDRs 3 520 7 647 Re-modified TDRs 8 4,773 3 306 Net paydowns — (5,668 ) — (1,215 ) Charge-offs: Residential mortgage loans — — — — Home equity loans — — — — Commercial real estate loans — — 1 (91 ) Commercial loans 2 (235 ) 5 (619 ) Paid-off loans: Residential mortgage loans — — 2 (2 ) Home equity loans 3 (68 ) 2 (12 ) Commercial real estate loans 3 (289 ) 2 (360 ) Commercial loans 1 (2 ) 3 (169 ) Ending TDR balance: 177 $ 30,300 197 $ 29,147 Accruing TDRs $ 21,162 $ 19,370 Non-accrual TDRs 9,138 9,777 For the nine months ended September 30, 2019 2018 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 195 $ 33,608 205 $ 32,104 New TDRs 5 826 26 6,443 Re-modified TDRs 8 4,773 3 306 Net paydowns — (6,454 ) — (3,037 ) Charge-offs: Residential mortgage loans — — 1 (135 ) Home equity loans — — — — Commercial real estate loans — — 2 (294 ) Commercial loans 2 (235 ) 6 (1,340 ) Paid-off loans: Residential mortgage loans 4 (180 ) 4 (257 ) Home equity loans 7 (143 ) 4 (59 ) Commercial real estate loans 9 (1,893 ) 9 (2,183 ) Commercial loans 1 (2 ) 8 (2,401 ) Ending TDR balance: 177 $ 30,300 197 $ 29,147 Accruing TDRs $ 21,162 $ 19,370 Non-accrual TDRs 9,138 9,777 The following tables provide information related to TDRs (including re-modified TDRs) by portfolio segment and by class of financing receivable during the periods indicated (in thousands): For the quarter ended September 30, 2019 For the nine months ended September 30, 2019 Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Personal Banking: Residential mortgage loans 1 $ 121 121 8 1 $ 121 121 8 Home equity loans 1 12 11 2 1 12 11 2 Total Personal Banking 2 133 132 10 2 133 132 10 Commercial Banking: Commercial real estate loans 8 6,014 5,120 549 9 6,314 5,417 581 Commercial loans 1 55 41 4 2 65 50 5 Total Commercial Banking 9 6,069 5,161 553 11 6,379 5,467 586 Total 11 $ 6,202 5,293 563 13 $ 6,512 5,599 596 TDRs modified within the previous twelve months that have subsequently defaulted: Personal Banking: Residential mortgage loans — $ — — — — $ — — — Home equity loans — — — — — — — — Total Personal Banking — — — — — — — — Commercial Banking Commercial real estate loans — — — — 2 2,785 2,775 5 Commercial loans 1 134 126 104 2 284 276 104 Total Commercial Banking 1 134 126 104 4 3,069 3,051 109 Total 1 $ 134 126 104 4 $ 3,069 3,051 109 A TDR is considered to be in default when a restructured loan is 90 days or more past due. For the quarter ended September 30, 2018 For the nine months ended September 30, 2018 Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Personal Banking: Residential mortgage loans 2 $ 342 342 35 6 $ 616 612 62 Home equity loans 4 194 193 47 12 511 462 113 Total Personal Banking 6 536 535 82 18 1,127 1,074 175 Commercial Banking: Commercial real estate loans 3 372 361 42 5 3,255 3,198 97 Commercial loans 1 45 45 5 6 2,367 1,484 21 Total Commercial Banking 4 417 406 47 11 5,622 4,682 118 Total 10 $ 953 941 129 29 $ 6,749 5,756 293 During the quarter and nine months ended September 30, 2018 , no TDRs modified within the previous twelve months of September 30, 2018 , subsequently defaulted. The following table provides information as of September 30, 2019 for TDRs (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended September 30, 2019 (in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 1 $ — — 121 — 121 Home equity loans 1 — — 11 — 11 Total Personal Banking 2 — — 132 — 132 Commercial Banking: Commercial real estate loans 8 — 222 4,898 — 5,120 Commercial loans 1 — — 41 — 41 Total Commercial Banking 9 — 222 4,939 — 5,161 Total 11 $ — 222 5,071 — 5,293 The following table provides information as of September 30, 2018 for TDRs (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended September 30, 2018 (in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 2 $ — — 342 — 342 Home equity loans 4 193 — — — 193 Total Personal Banking 6 193 — 342 — 535 Commercial Banking: Commercial real estate loans 3 — — 361 — 361 Commercial loans 1 — — 45 — 45 Total Commercial Banking 4 — — 406 — 406 Total 10 $ 193 — 748 — 941 The following table provides information as of September 30, 2019 for TDRs (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the nine months ended September 30, 2019 (in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 1 $ — — 121 — 121 Home equity loans 1 — — 11 — 11 Total Personal Banking 2 — — 132 — 132 Commercial Banking: Commercial real estate loans 9 — 519 4,898 — 5,417 Commercial loans 2 — — 50 — 50 Total Commercial Banking 11 — 519 4,948 — 5,467 Total 13 $ — 519 5,080 — 5,599 The following table provides information as of September 30, 2018 for TDRs (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the nine months ended September 30, 2018 (in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 6 $ 7 — 519 86 612 Home equity loans 12 222 — 47 193 462 Total Personal Banking 18 229 — 566 279 1,074 Commercial Banking: Commercial real estate loans 5 — 482 361 2,355 3,198 Commercial loans 6 — — 183 1,301 1,484 Total Commercial Banking 11 — 482 544 3,656 4,682 Total 29 $ 229 482 1,110 3,935 5,756 During the nine months ended September 30, 2019 , eight commercial banking TDRs were re-modified. During the nine months ended September 30, 2018 , three commercial banking TDRs were re-modified. The following table provides information related to loan payment delinquencies at September 30, 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 $ 1,171 5,185 10,116 16,472 2,792,485 2,808,957 — Home equity loans 3,407 1,724 4,875 10,006 1,059,900 1,069,906 — Consumer finance loans 98 43 1 142 730 872 — Consumer loans 7,221 2,557 3,190 12,968 1,040,188 1,053,156 — Total Personal Banking 11,897 9,509 18,182 39,588 4,893,303 4,932,891 — Commercial Banking: Commercial real estate loans 3,745 835 15,534 20,114 2,353,940 2,374,054 — Commercial loans 182 519 4,658 5,359 655,928 661,287 — Total Commercial Banking 3,927 1,354 20,192 25,473 3,009,868 3,035,341 — Total originated loans 15,824 10,863 38,374 65,061 7,903,171 7,968,232 — Acquired loans Personal Banking: Residential mortgage loans 65 135 1,700 1,900 85,276 87,176 94 Home equity loans 1,367 379 1,091 2,837 255,430 258,267 — Consumer loans 278 32 210 520 39,745 40,265 1 Total Personal Banking 1,710 546 3,001 5,257 380,451 385,708 95 Commercial Banking: Commercial real estate loans 1,563 1,058 6,758 9,379 429,406 438,785 — Commercial loans 180 70 1,083 1,333 57,959 59,292 — Total Commercial Banking 1,743 1,128 7,841 10,712 487,365 498,077 — Total acquired loans 3,453 1,674 10,842 15,969 867,816 883,785 95 Total loans $ 19,277 12,537 49,216 81,030 8,770,987 8,852,017 95 (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 as of September 30, 2019 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans Personal Banking: Residential mortgage loans $ 2,801,228 — 7,729 — — 2,808,957 Home equity loans 1,064,182 — 5,724 — — 1,069,906 Consumer finance loans 872 — — — — 872 Consumer loans 1,049,270 — 3,886 — — 1,053,156 Total Personal Banking 4,915,552 — 17,339 — — 4,932,891 Commercial Banking: Commercial real estate loans 2,209,327 63,051 101,495 181 — 2,374,054 Commercial loans 588,924 35,299 36,949 115 — 661,287 Total Commercial Banking 2,798,251 98,350 138,444 296 — 3,035,341 Total originated loans 7,713,803 98,350 155,783 296 — 7,968,232 Acquired loans Personal Banking: Residential mortgage loans 85,849 — 1,327 — — 87,176 Home equity loans 256,748 — 1,519 — — 258,267 Consumer loans 39,888 — 377 — — 40,265 Total Personal Banking 382,485 — 3,223 — — 385,708 Commercial Banking: Commercial real estate loans 391,698 6,329 40,758 — — 438,785 Commercial loans 51,074 2,367 5,851 — — 59,292 Total Commercial Banking 442,772 8,696 46,609 — — 498,077 Total acquired loans 825,257 8,696 49,832 — — 883,785 Total loans $ 8,539,060 107,046 205,615 296 — 8,852,017 The following table sets forth information about credit quality i

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 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): September 30, 2019 December 31, 2018 Amortizable intangible assets: Core deposit intangibles - gross $ 63,685 63,685 Acquisitions 7,498 — Less: accumulated amortization (49,487 ) (45,027 ) Core deposit intangibles - net 21,696 18,658 Customer and Contract intangible assets - gross 10,474 10,474 Less: accumulated amortization (9,760 ) (9,311 ) Customer and Contract intangible assets - net 714 1,163 Total intangible assets - net $ 22,410 19,821 The following table shows the actual aggregate amortization expense for the quarters ended September 30, 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 September 30, 2019 $ 1,702 For the quarter ended September 30, 2018 1,462 For the nine months ended September 30, 2019 4,909 For the nine months ended September 30, 2018 4,502 For the year ending December 31, 2019 6,495 For the year ending December 31, 2020 5,669 For the year ending December 31, 2021 4,572 For the year ending December 31, 2022 3,572 For the year ending December 31, 2023 2,695 For the year ending December 31, 2024 2,010 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 September 30, 2019 $ 344,720 We performed our annual goodwill impairment test as of June 30, 2019 in accordance with ASC 350, as updated by ASU 2017-04, ("Step 0") and concluded that goodwill was not impaired. As of September 30, 2019 , there were no events or changes in circumstances that would cause us to update that goodwill impairment test.

Borrowed Funds

Borrowed Funds	9 Months Ended
	Sep. 30, 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 September 30, 2019 and December 31, 2018 , the balance of the revolving line of credit was $172.2 million and $128.6 million , respectively. At September 30, 2019 and December 31, 2018 , collateralized borrowings due within one year were $83.1 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 September 30, 2019 was 3.48% . Northwest Bancorp Statutory Trust IV holds $51,547,000 of the Company’s junior subordinated debentures due December 15, 2035 with a floating rate of interest, reset quarterly, of three-month LIBOR plus 1.38% . The rate in effect at September 30, 2019 was 3.50% . LNB Trust II holds $8,119,000 of the Company's junior subordinated debentures due June 15, 2037, with a floating rate of interest, reset quarterly, of three-month LIBOR plus 1.48% . The rate in effect at September 30, 2019 was 3.60% . 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 September 30, 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 September 30, 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 2.00% . 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. As the shareholders of the trust preferred securities are the primary beneficiaries of the Trusts, the Trusts are not consolidated in our financial statements. 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	9 Months Ended
	Sep. 30, 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 September 30, 2019 , the maximum potential amount of future payments we could be required to make under these non-recourse standby letters of credit was $39.6 million , of which $32.8 million is fully collateralized. At September 30, 2019 , we had a liability, which represents deferred income, of $331,000

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 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 September 30, 2019 and 2018 were included in the computation of diluted earnings per share because the stock options’ exercise price was less than the average market price of the common shares of $16.69 and $ 18.01 , respectively. All stock options outstanding during the nine months ended September 30, 2019 and 2018 were included in the computation of diluted earnings per share because the stock options' exercise price was less than the average market price of the common shares of $17.19 and $17.30 , respectively. The following table sets forth the computation of basic and diluted EPS (in thousands, except share data and per share amounts): Quarter ended September 30, Nine months ended September 30, 2019 2018 2019 2018 Net income available to common shareholders $ 33,414 27,740 84,841 79,024 Weighted average common shares outstanding 105,517,707 102,334,954 104,626,560 101,937,338 Dilutive potential shares due to effect of stock options 752,837 1,607,741 1,055,055 1,566,731 Total weighted average common shares and dilutive potential shares 106,270,544 103,942,695 105,681,615 103,504,069 Basic earnings per share $ 0.32 0.27 0.81 0.78 Diluted earnings per share $ 0.31 0.27 0.80 0.76

Pension and Other Post-retireme

Pension and Other Post-retirement Benefits	9 Months Ended
	Sep. 30, 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 September 30, Pension benefits Other post-retirement benefits 2019 2018 2019 2018 Service cost $ 1,487 1,716 — — Interest cost 1,839 1,678 13 14 Expected return on plan assets (2,759 ) (2,992 ) — — Amortization of prior service cost (581 ) (581 ) — — Amortization of the net loss 856 872 17 24 Net periodic cost $ 842 693 30 38 Nine months ended September 30, Pension benefits Other post-retirement benefits 2019 2018 2019 2018 Service cost $ 4,462 5,148 — — Interest cost 5,515 5,034 39 41 Expected return on plan assets (8,278 ) (8,976 ) — — Amortization of prior service cost (1,742 ) (1,742 ) — — Amortization of the net loss 2,568 2,617 51 73 Net periodic cost $ 2,525 2,081 90 114 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	9 Months Ended
	Sep. 30, 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 and cash equivalents, marketable securities available-for-sale, accrued interest receivable, interest rate lock commitments, forward commitments, interest rate swaps, savings and checking deposits and accrued interest payable. 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. Debt securities — held-to-maturity - The fair value of debt securities held-to-maturity is determined in the same manner as debt securities available-for-sale. Loans held-for-sale The estimated fair value of loans held-for-sale is based on market bids obtained from potential buyers. Loans held for investment The fair value of the loans held of investment 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. Interest rate lock commitments and forward commitments The fair value of interest rate lock commitments is based on the value of underlying loans held-for-sale which is based on quoted prices for similar loans in the secondary market. This value is then adjusted based on the probability of the loan closing (i.e. the “pull-through” amount, a significant unobservable input). The fair value of forward sale commitments is based on quoted prices from the secondary market based on the settlement date of the contracts. 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 September 30, 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 September 30, 2019 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 107,602 107,602 107,602 — — Securities available-for-sale 807,823 807,823 — 807,823 — Securities held-to-maturity 18,958 19,237 — 19,237 — Loans receivable, net 8,790,299 8,693,690 — — 8,693,690 Residential mortgage loans held-for-sale 8,859 8,859 — — 8,859 Accrued interest receivable 27,069 27,069 27,069 — — Interest rate lock commitments 505 505 — — 505 Forward commitments 215 215 — 215 — Interest rate swaps 26,181 26,181 — 26,181 — FHLB stock 21,401 21,401 — — — Total financial assets $ 9,808,912 9,712,582 134,671 853,456 8,703,054 Financial liabilities: Savings and checking deposits $ 7,048,049 7,048,049 7,048,049 — — Time deposits 1,633,451 1,644,309 — — 1,644,309 Borrowed funds 255,257 255,260 255,260 — — Junior subordinated debentures 121,787 116,872 — — 116,872 Interest rate swaps 26,257 26,257 — 26,257 — Accrued interest payable 1,314 1,314 1,314 — — Total financial liabilities $ 9,086,115 9,092,061 7,304,623 26,257 1,761,181 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 Residential mortgage loans held-for-sale — — — — — 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 September 30, 2019 and December 31, 2018 . There were no transfers of financial instruments between Level 1 and Level 2 during the quarter ended September 30, 2019 . The following table represents assets and liabilities measured at fair value on a recurring basis at September 30, 2019 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Debt securities: U.S. government and agencies $ — 14,965 — 14,965 Government sponsored enterprises — 119,833 — 119,833 States and political subdivisions — 29,390 — 29,390 Corporate — 918 — 918 Total debt securities — 165,106 — 165,106 Residential mortgage-backed securities: GNMA — 24,715 — 24,715 FNMA — 86,858 — 86,858 FHLMC — 53,209 — 53,209 Non-agency — 506 — 506 Collateralized mortgage obligations: GNMA — 144,829 — 144,829 FNMA — 200,873 — 200,873 FHLMC — 131,727 — 131,727 Total mortgage-backed securities — 642,717 — 642,717 Interest rate lock commitments — — 505 505 Forward commitments — 215 — 215 Interest rate swaps — 26,181 — 26,181 Total assets $ — 834,219 505 834,724 Interest rate swaps $ — 26,257 — 26,257 Total liabilities $ — 26,257 — 26,257 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 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 The following table presents the changes in Level 3 assets and liabilities measured at fair value on a recurring basis (in thousands): For the quarter ended September 30, For the nine months ended September 30, 2019 2018 2019 2018 Beginning balance $ — — — — Total gains or losses Included in earnings — — — — Purchases 505 — 505 — Sales — — — — Transfers from Level 3 — — — — Transfers into Level 3 — — — — Ending balance $ 505 — 505 — Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as loans measured for impairment, real estate owned, and mortgage servicing rights. The following table represents the fair market measurement for only those nonrecurring assets that had a fair market value below the carrying amount as of September 30, 2019 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 40,603 40,603 Real estate owned — — 1,237 1,237 Total assets $ — — 41,840 41,840 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, net — — 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 September 30, 2019 (in thousands): Fair value Valuation techniques Significant unobservable inputs Range (weighted average) Loans measured for impairment $ 40,603 Appraisal value (1) Estimated cost to sell 10.0% Discounted cash flow Discount rate 4.25% to 11.0% (7.50%) Real estate owned $ 1,237 Appraisal value (1) Estimated cost to sell 10.0% (1) Fair value is generally determined through independent appraisals of the underlying collateral, which may include Level 3 inputs that are not identifiable, or by using the discounted cash flow method if the loan is not collateral dependent.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 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. We enter into interest rate lock commitments for residential mortgage loans which commit us to lend funds to a potential borrower at a specific interest rate within a specified period of time. Interest rate lock commitments that relate to the origination of mortgage loans that will be held-for-sale are considered derivative financial instruments under applicable accounting guidance. Interest rate lock commitments on loans held-for-sale are carried at fair value in other assets on the consolidated statement of financial condition. Northwest sells loans to the secondary market on a mandatory or best efforts basis. The loans sold on a mandatory basis commit us to deliver a specific principal amount of mortgage loans to an investor at a specified price, by a specified date, or the commitment must be paired off. These forward commitments entered into on a mandatory delivery basis meet the definition of a derivative financial instrument. All closed loans to be sold on a mandatory delivery basis are classified as held-for-sale on the consolidated statement of financial condition. Changes to the fair value of the interest rate lock commitments and the forward commitments are recorded in mortgage banking income in the consolidated statements 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 September 30, 2019 Derivatives not designated as hedging instruments: Interest rate swap agreements $ 317,086 26,181 317,086 26,257 Interest rate lock commitments 25,331 505 — — Forward commitments 7,907 215 — — Total derivatives $ 350,324 26,901 317,086 26,257 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 September 30, For the nine months ended September 30, 2019 2018 2019 2018 Hedging derivatives: Increase in interest expense $ — 257 — 857 Non-hedging swap derivatives: Decrease in other income (125 ) — (195 ) (288 ) Increase in mortgage banking income 720 — 720 —

Legal Proceedings

Legal Proceedings	9 Months Ended
	Sep. 30, 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 September 30, 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 December 21, 2018, a verdict was rendered in favor of NWIS on several of its claims. Post-trial proceedings have concluded with the verdict affirmed and attorneys’ fees awarded. An appeal has been filed with the Pennsylvania Superior Court. 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 September 30, 2019 .

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income	Changes in Accumulated Other Comprehensive Income The following tables show the changes in accumulated other comprehensive income/(loss) by component for the periods indicated (in thousands): For the quarter ended September 30, 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 June 30, 2019 $ 3,227 — (32,446 ) (29,219 ) Other comprehensive income before reclassification adjustments (1) 1,315 — — 1,315 Amounts reclassified from accumulated other comprehensive income (2), (3) (1 ) — 208 207 Net other comprehensive income 1,314 — 208 1,522 Balance as of September 30, 2019 $ 4,541 — (32,238 ) (27,697 ) For the quarter ended September 30, 2018 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of June 30, 2018 $ (10,693 ) (266 ) (32,134 ) (43,093 ) Other comprehensive income/(loss) before reclassification adjustments (4), (5) (1,970 ) 192 — (1,778 ) Amounts reclassified from accumulated other comprehensive income (6), (7) (44 ) — 226 182 Net other comprehensive income/(loss) (2,014 ) 192 226 (1,596 ) Balance as of September 30, 2018 $ (12,707 ) (74 ) (31,908 ) (44,689 ) (1) Consists of unrealized holding loss, net of tax of $(525) . (2) Consists of realized gain on securities (gain on sales of investments, net) of $ (1) , net of tax (income tax expense) of $ 0 . (3) Consists of amortization of prior service cost (compensation and employee benefits) of $(581) and amortization of net loss (compensation and employee benefits) of $890 , net of tax (income tax expense) of $(83) . (4) Consists of unrealized holding gain, net of tax $788 . (5) Change in fair value of interest rate swaps, net of tax $(51) . (6) Consists of realized gains on securities (gain on sales of investments, net) of $61 , net of tax (income tax expense) of $17 . (7) 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) . For the nine months ended September 30, 2019 Unrealized gains 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 (1) 11,376 — — 11,376 Amounts reclassified from accumulated other comprehensive income (2), (3) (3 ) — 626 623 Net other comprehensive income 11,373 — 626 11,999 Balance as of September 30, 2019 $ 4,541 — (32,238 ) (27,697 ) For the nine months ended September 30, 2018 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of December 31, 2017 $ (4,409 ) (691 ) (26,980 ) (32,080 ) Reclassification due to adoption of ASU No. 2018-02 (991 ) (149 ) (5,606 ) (6,746 ) Other comprehensive income/(loss) before reclassification adjustments (4), (5) (7,169 ) 766 — (6,403 ) Amounts reclassified from accumulated other comprehensive income (6), (7) (138 ) — 678 540 Net other comprehensive income/(loss) (7,307 ) 766 678 (5,863 ) Balance as of September 30, 2018 $ (12,707 ) (74 ) (31,908 ) (44,689 ) (1) Consists of unrealized holding loss, net of tax of $(4,549) . (2) Consists of realized gain on securities (gain on sales of investments, net) of $(1) , net of tax (income tax expense) of $1 . (3) Consists of amortization of prior service cost (compensation and employee benefits) of $(1,742) , and amortization of net loss (compensation and employee benefits) of $2,669 , net of tax (income tax expense) of $(250) . (4) Consists of unrealized holding gain, net of tax of $2,869 . (5) Change in fair value of interest rate swaps, net of tax of $(204) . (6) Consists of realized gains on securities (gain on sales of investments, net) of $192 , net of tax (income tax expense) of $ 54 . (7) Consists of amortization of prior service cost (compensation and employee benefits) of $1,742 and amortization of net loss (compensation and employee benefits) of $(2,691) , net of tax (income tax expense) of $(271) .

Subsequent events

Subsequent events	9 Months Ended
	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent events	Subsequent events The Company previously announced that it has entered into an Agreement and Plan of Merger (the “Merger Agreement”) by and between the Company and MutualFirst Financial, Inc. (“MutualFirst Financial”). Pursuant to the Merger Agreement, MutualFirst Financial will merge with and into the Company, with the Company as the surviving entity. Immediately thereafter, MutualBank, the wholly owned subsidiary of MutualFirst Financial, will merge with and into Northwest Bank, the wholly owned subsidiary of the Company, with Northwest Bank as the surviving entity. Under the terms of the Merger Agreement, each share of common stock of MutualFirst Financial will be converted into the right to receive 2.4 shares of the Company’s common stock, for total consideration valued at approximately $346 million , or $39.89 per share based on the Company's 15 -day volume weighted average closing stock pricing ending on October 23, 2019. The transaction has been approved by the Boards of Directors of the Company and MutualFirst Financial. Completion of the transaction is subject to customary closing conditions, including the receipt of required regulatory approvals and the approval of stockholders of MutualFirst Financial. As of September 30, 2019, MutualFirst Financial has total assets of $2.074 billion (unaudited) and net income of $17.1 million

Basis of Presentation and Inf_2

Basis of Presentation and Informational Disclosures (Policies)	9 Months Ended
	Sep. 30, 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 September 30, 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 and 2016 .
Recently Adopted Accounting Standards and Recently Issued 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 recognizes 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 approximately $40.2 million , an operating lease liability of approximately $42.2 million and a cumulative-effect adjustment on retained earnings of $1.2 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. The working group meets periodically to discuss the progress of implementations, monitor the established timeline and discuss latest hot topics and industry trends. We have engaged with a third party to assist in the development of certain portfolio-level estimation methodologies and have chosen, and are in the process of implementing, a third-party software platform provider. We have finalized and documented the portfolio segmentation and methodologies that will be utilized. The model validation process has begun. Management has made decisions on reasonable and supportable forecast period and reversion method. Management is currently developing controls, processes, policies and disclosures in preparation for performing a full end to end parallel run. 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 will apply this guidance on a prospective basis upon adoption and do not expect it to have a material impact on our financial statements.

Acquisition (Tables)

Acquisition (Tables)	9 Months Ended
	Sep. 30, 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)	9 Months Ended
	Sep. 30, 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 For the nine months ended September 30, 2019 Operating lease costs (office operations) $ 1,443 4,124 Variable lease costs (office operations) 264 455 Total operating lease costs $ 1,707 4,579 Other information related to leases as of September 30, 2019 were as follows (in thousands): Supplemental cash flow information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flow from operating leases $ 4,132 ROU assets obtained in exchange for lease obligations $ 11,518 Weighted average remaining lease term 15.7 years Weighted average discount rate 3.7 %
Assets And Liabilities, Lessee	Amounts reported in the consolidated statements of financial condition were as follows (in thousands): Operating leases: As of September 30, 2019 Operating lease ROU assets (other assets) $ 48,857 Operating lease liabilities (other liabilities) 51,531
Lessee, Operating Lease, Liability, Maturity	Maturities of lease liabilities by fiscal year for our operating leases are as follows (in thousands): As of September 30, 2019 2019 $ 1,444 2020 5,447 2021 5,115 2022 4,814 2023 4,559 Thereafter 49,087 Total lease payments 70,466 Less amount of lease payments representing interest 18,935 Total present value of lease payments $ 51,531
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)	9 Months Ended
	Sep. 30, 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 September 30, 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 less than one year $ 14,902 63 — 14,965 Debt issued by government sponsored enterprises: Due in less than one year 55,099 260 (6 ) 55,353 Due in one year through five years 60,922 116 (340 ) 60,698 Due in five years through ten years 3,830 66 (114 ) 3,782 Municipal securities: Due in less than one year 245 1 — 246 Due in one year through five years 3,799 81 — 3,880 Due in five years through ten years 11,052 154 — 11,206 Due after ten years 13,741 317 — 14,058 Corporate debt issues: Due in five years through ten years 918 — — 918 Residential mortgage-backed securities: Fixed rate pass-through 143,419 2,041 (1,065 ) 144,395 Variable rate pass-through 20,063 834 (4 ) 20,893 Fixed rate agency CMOs 415,760 5,026 (1,190 ) 419,596 Variable rate agency CMOs 57,715 236 (118 ) 57,833 Total residential mortgage-backed securities 636,957 8,137 (2,377 ) 642,717 Total marketable securities available-for-sale $ 801,465 9,195 (2,837 ) 807,823 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 less than one year 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 less than one year 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 September 30, 2019 (in thousands): Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value Residential mortgage-backed securities: Fixed rate pass-through $ 2,317 86 — 2,403 Variable rate pass-through 1,317 36 — 1,353 Fixed rate agency CMOs 14,711 148 — 14,859 Variable rate agency CMOs 613 9 — 622 Total residential mortgage-backed securities 18,958 279 — 19,237 Total marketable securities held-to-maturity $ 18,958 279 — 19,237 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 September 30, 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 $ — — 67,610 (460 ) 67,610 (460 ) Municipal securities — — — — — — Residential mortgage-backed securities - agency 79,196 (287 ) 123,883 (2,090 ) 203,079 (2,377 ) Total temporarily impaired securities $ 79,196 (287 ) 191,493 (2,550 ) 270,689 (2,837 ) 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 quarters ended September 30, (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 September 30, $ — — (1) The beginning balance represents credit losses included in other-than-temporary impairment charges recognized on debt securities in prior periods.

Loans receivable (Tables)

Loans receivable (Tables)	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Summary of loans receivable	The following table shows a summary of our loans receivable at September 30, 2019 and December 31, 2018 (in thousands): September 30, 2019 December 31, 2018 Originated Acquired Total Originated Acquired Total Personal Banking: Residential mortgage loans (1) $ 2,804,792 87,176 2,891,968 2,766,430 93,782 2,860,212 Home equity loans 1,069,906 258,267 1,328,173 1,043,878 214,544 1,258,422 Consumer finance loans (2) 872 — 872 3,817 — 3,817 Consumer loans 1,022,976 39,731 1,062,707 775,378 58,671 834,049 Total Personal Banking 4,898,546 385,174 5,283,720 4,589,503 366,997 4,956,500 Commercial Banking: Commercial real estate loans 2,558,688 443,075 3,001,763 2,416,047 223,327 2,639,374 Commercial loans 717,644 60,438 778,082 612,962 48,816 661,778 Total Commercial Banking 3,276,332 503,513 3,779,845 3,029,009 272,143 3,301,152 Total loans receivable, gross 8,174,878 888,687 9,063,565 7,618,512 639,140 8,257,652 Deferred loan costs 49,921 534 50,455 36,820 798 37,618 Allowance for loan losses (47,417 ) (5,442 ) (52,859 ) (51,751 ) (3,463 ) (55,214 ) Undisbursed loan proceeds: Residential mortgage loans (15,576 ) — (15,576 ) (11,513 ) — (11,513 ) Commercial real estate loans (184,634 ) (4,290 ) (188,924 ) (167,029 ) (524 ) (167,553 ) Commercial loans (56,357 ) (1,146 ) (57,503 ) (63,605 ) (1,160 ) (64,765 ) Total loans receivable, net $ 7,920,815 878,343 8,799,158 7,361,434 634,791 7,996,225 (1) Includes $8.9 million and $0 of loans held-for-sale at September 30, 2019 and December 31, 2018 , respectively. (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): September 30, 2019 December 31, 2018 Acquired loans evaluated individually for future credit losses: Outstanding principal balance $ 7,616 8,189 Carrying value 5,150 5,690 Acquired loans evaluated collectively for future credit losses: Outstanding principal balance 889,065 637,170 Carrying value 878,635 632,564 Total acquired loans: Outstanding principal balance 896,681 645,359 Carrying value 883,785 638,254
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 (382 ) Net reclassification from nonaccretable yield 938 Balance at September 30, 2019 $ 1,311
Schedule of the composition of impaired loans by portfolio segment and by class of financing receivable	The following table provides information related to the composition of originated impaired loans by portfolio segment and by class of financing receivable at and for the nine months ended September 30, 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 $ 11,722 1,695 505 6,048 19,970 19,522 608 Home equity loans 5,966 1,145 — 1,595 8,706 8,709 348 Consumer finance loan 1 — — — 1 — — Consumer loans 3,399 740 — — 4,139 3,744 180 Total Personal Banking 21,088 3,580 505 7,643 32,816 31,975 1,136 Commercial Banking: Commercial real estate loans 22,292 9,135 4,897 8,198 44,522 45,828 1,295 Commercial loans 5,741 3,821 397 1,508 11,467 10,099 319 Total Commercial Banking 28,033 12,956 5,294 9,706 55,989 55,927 1,614 Total $ 49,121 16,536 5,799 17,349 88,805 87,902 2,750 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 The following table provides information related to acquired impaired loans by portfolio segment and by class of financing receivable at and for the nine months ended September 30, 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 $ 908 1,516 3 949 78 Home equity loans 739 1,651 16 874 89 Consumer loans 10 40 1 19 11 Total Personal Banking 1,657 3,207 20 1,842 178 Commercial Banking: Commercial real estate loans 3,415 4,324 2 3,500 201 Commercial loans 78 85 — 78 3 Total Commercial Banking 3,493 4,409 2 3,578 204 Total $ 5,150 7,616 22 5,420 382 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
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 September 30, 2019 (in thousands): Balance as of September 30, 2019 Current period provision Charge-offs Recoveries Balance as of Originated loans Personal Banking: Residential mortgage loans $ 2,507 (1,361 ) (109 ) 68 3,909 Home equity loans 2,791 (81 ) (176 ) 58 2,990 Consumer finance loans 140 (141 ) (59 ) 74 266 Consumer loans 12,035 3,920 (2,916 ) 531 10,500 Total Personal Banking 17,473 2,337 (3,260 ) 731 17,665 Commercial Banking: Commercial real estate loans 20,215 (1,206 ) (261 ) 720 20,962 Commercial loans 9,729 958 (1,118 ) 87 9,802 Total Commercial Banking 29,944 (248 ) (1,379 ) 807 30,764 Total originated loans 47,417 2,089 (4,639 ) 1,538 48,429 Acquired loans Personal Banking: Residential mortgage loans 92 41 (81 ) 28 104 Home equity loans 295 220 (290 ) 21 344 Consumer loans 554 63 (103 ) 83 511 Total Personal Banking 941 324 (474 ) 132 959 Commercial Banking: Commercial real estate loans 3,622 1,155 (128 ) 24 2,571 Commercial loans 879 (266 ) (33 ) 30 1,148 Total Commercial Banking 4,501 889 (161 ) 54 3,719 Total acquired loans 5,442 1,213 (635 ) 186 4,678 Total $ 52,859 3,302 (5,274 ) 1,724 53,107 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the quarter ended September 30, 2018 (in thousands): Balance as of September 30, 2018 Current period provision Charge-offs Recoveries Balance as of Originated loans Personal Banking: Residential mortgage loans $ 4,144 491 (204 ) 200 3,657 Home equity loans 3,234 (351 ) (323 ) 69 3,839 Consumer finance loans 1,650 (437 ) (445 ) 178 2,354 Consumer loans 11,021 4,023 (3,392 ) 630 9,760 Total Personal Banking 20,049 3,726 (4,364 ) 1,077 19,610 Commercial Banking: Commercial real estate loans 25,694 8,723 (4,820 ) 772 21,019 Commercial loans 5,730 (3,945 ) (914 ) 80 10,509 Total Commercial Banking 31,424 4,778 (5,734 ) 852 31,528 Total originated loans 51,473 8,504 (10,098 ) 1,929 51,138 Acquired loans Personal Banking: Residential mortgage loans 102 (70 ) (10 ) 12 170 Home equity loans 408 (173 ) (103 ) 22 662 Consumer loans 444 (448 ) (78 ) 55 915 Total Personal Banking 954 (691 ) (191 ) 89 1,747 Commercial Banking: Commercial real estate loans 2,876 (532 ) (39 ) 25 3,422 Commercial loans 672 (299 ) (71 ) 17 1,025 Total Commercial Banking 3,548 (831 ) (110 ) 42 4,447 Total acquired loans 4,502 (1,522 ) (301 ) 131 6,194 Total $ 55,975 6,982 (10,399 ) 2,060 57,332 The following table provides information related to the allowance for loan losses by portfolio segment and by class of financing receivable for the nine months ended September 30, 2019 (in thousands): Balance as of September 30, 2019 Current period provision Charge-offs Recoveries Balance as of December 31, 2018 Originated loans Personal Banking: Residential mortgage loans $ 2,507 (991 ) (847 ) 291 4,054 Home equity loans 2,791 36 (536 ) 107 3,184 Consumer finance loans 140 (561 ) (296 ) 321 676 Other consumer loans 12,035 8,298 (8,196 ) 1,529 10,404 Total Personal Banking 17,473 6,782 (9,875 ) 2,248 18,318 Commercial Banking: Commercial real estate loans 20,215 (2,177 ) (4,978 ) 991 26,379 Commercial loans 9,729 4,769 (2,449 ) 355 7,054 Total Commercial Banking 29,944 2,592 (7,427 ) 1,346 33,433 Total originated loans 47,417 9,374 (17,302 ) 3,594 51,751 Acquired loans Personal Banking: Residential mortgage loans 92 50 (97 ) 56 83 Home equity loans 295 249 (472 ) 170 348 Other consumer loans 554 131 (173 ) 177 419 Total Personal Banking 941 430 (742 ) 403 850 Commercial Banking: Commercial real estate loans 3,622 1,432 (382 ) 576 1,996 Commercial loans 879 3,200 (3,059 ) 121 617 Total Commercial Banking 4,501 4,632 (3,441 ) 697 2,613 Total acquired loans 5,442 5,062 (4,183 ) 1,100 3,463 Total $ 52,859 14,436 (21,485 ) 4,694 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 nine months ended September 30, 2018 (in thousands): Balance as of September 30, 2018 Current period provision Charge-offs Recoveries Balance as of December 31, 2017 Originated loans Personal Banking: Residential mortgage loans $ 4,144 678 (710 ) 352 3,824 Home equity loans 3,234 (164 ) (866 ) 192 4,072 Consumer finance loans 1,650 (469 ) (2,484 ) 635 3,968 Other consumer loans 11,021 9,845 (9,192 ) 1,893 8,475 Total Personal Banking 20,049 9,890 (13,252 ) 3,072 20,339 Commercial Banking: Commercial real estate loans 25,694 10,417 (5,702 ) 1,068 19,911 Commercial loans 5,730 (2,912 ) (2,053 ) 373 10,322 Total Commercial Banking 31,424 7,505 (7,755 ) 1,441 30,233 Total originated loans 51,473 17,395 (21,007 ) 4,513 50,572 Acquired loans Personal Banking: Residential mortgage loans 102 (38 ) (94 ) 103 131 Home equity loans 408 85 (578 ) 139 762 Other consumer loans 444 (363 ) (209 ) 126 890 Total Personal Banking 954 (316 ) (881 ) 368 1,783 Commercial Banking: Commercial real estate loans 2,876 (688 ) (147 ) 162 3,549 Commercial loans 672 149 (448 ) 80 891 Total Commercial Banking 3,548 (539 ) (595 ) 242 4,440 Total acquired loans 4,502 (855 ) (1,476 ) 610 6,223 Total $ 55,975 16,540 (22,483 ) 5,123 56,795
Schedule of loan portfolio by portfolio segment and by class of financing receivable	The following table provides information related to the loan portfolio by portfolio segment and by class of financing receivable at September 30, 2019 (in thousands): Total loans receivable Allowance for loan losses Nonaccrual loans (1) Loans 90 days past maturity and accruing TDRs Allowance related to TDRs Additional commitments to customers with loans classified as TDRs Personal Banking: Residential mortgage loans $ 2,896,133 2,599 13,417 — 7,453 565 — Home equity loans 1,328,173 3,086 7,111 — 1,929 394 26 Consumer finance loans 872 140 1 35 — — — Consumer loans 1,093,421 12,589 4,139 50 — — — Total Personal Banking 5,318,599 18,414 24,668 85 9,382 959 26 Commercial Banking: Commercial real estate loans 2,812,839 23,837 31,427 — 17,840 1,398 475 Commercial loans 720,579 10,608 9,562 — 3,078 650 170 Total Commercial Banking 3,533,418 34,445 40,989 — 20,918 2,048 645 Total $ 8,852,017 52,859 65,657 85 30,300 3,007 671 (1) Includes $9.1 million of nonaccrual TDRs. 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 90 days past maturity and accruing 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.
Schedule of the evaluation of impaired loans by portfolio segment and by class of financing receivable	The following table provides information related to the evaluation of impaired loans by portfolio segment and by class of financing receivable at September 30, 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 $ 2,888,290 7,843 7,843 566 — Home equity loans 1,326,245 1,928 1,928 394 — Consumer finance loans 872 — — — — Consumer loans 1,093,408 13 13 3 — Total Personal Banking 5,308,815 9,784 9,784 963 — Commercial Banking: Commercial real estate loans 2,780,752 32,087 28,375 3,142 3,712 Commercial loans 711,670 8,909 7,453 905 1,456 Total Commercial Banking 3,492,422 40,996 35,828 4,047 5,168 Total $ 8,801,237 50,780 45,612 5,010 5,168 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 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 tables provide a roll forward of TDRs for the periods indicated (in thousands): For the quarter ended September 30, 2019 2018 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 183 $ 31,269 205 $ 30,662 New TDRs 3 520 7 647 Re-modified TDRs 8 4,773 3 306 Net paydowns — (5,668 ) — (1,215 ) Charge-offs: Residential mortgage loans — — — — Home equity loans — — — — Commercial real estate loans — — 1 (91 ) Commercial loans 2 (235 ) 5 (619 ) Paid-off loans: Residential mortgage loans — — 2 (2 ) Home equity loans 3 (68 ) 2 (12 ) Commercial real estate loans 3 (289 ) 2 (360 ) Commercial loans 1 (2 ) 3 (169 ) Ending TDR balance: 177 $ 30,300 197 $ 29,147 Accruing TDRs $ 21,162 $ 19,370 Non-accrual TDRs 9,138 9,777 For the nine months ended September 30, 2019 2018 Number of contracts Amount Number of contracts Amount Beginning TDR balance: 195 $ 33,608 205 $ 32,104 New TDRs 5 826 26 6,443 Re-modified TDRs 8 4,773 3 306 Net paydowns — (6,454 ) — (3,037 ) Charge-offs: Residential mortgage loans — — 1 (135 ) Home equity loans — — — — Commercial real estate loans — — 2 (294 ) Commercial loans 2 (235 ) 6 (1,340 ) Paid-off loans: Residential mortgage loans 4 (180 ) 4 (257 ) Home equity loans 7 (143 ) 4 (59 ) Commercial real estate loans 9 (1,893 ) 9 (2,183 ) Commercial loans 1 (2 ) 8 (2,401 ) Ending TDR balance: 177 $ 30,300 197 $ 29,147 Accruing TDRs $ 21,162 $ 19,370 Non-accrual TDRs 9,138 9,777
Schedule of troubled debt restructurings (including re-modified TDRs) by portfolio segment and by class of financing receivable	The following tables provide information related to TDRs (including re-modified TDRs) by portfolio segment and by class of financing receivable during the periods indicated (in thousands): For the quarter ended September 30, 2019 For the nine months ended September 30, 2019 Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Personal Banking: Residential mortgage loans 1 $ 121 121 8 1 $ 121 121 8 Home equity loans 1 12 11 2 1 12 11 2 Total Personal Banking 2 133 132 10 2 133 132 10 Commercial Banking: Commercial real estate loans 8 6,014 5,120 549 9 6,314 5,417 581 Commercial loans 1 55 41 4 2 65 50 5 Total Commercial Banking 9 6,069 5,161 553 11 6,379 5,467 586 Total 11 $ 6,202 5,293 563 13 $ 6,512 5,599 596 TDRs modified within the previous twelve months that have subsequently defaulted: Personal Banking: Residential mortgage loans — $ — — — — $ — — — Home equity loans — — — — — — — — Total Personal Banking — — — — — — — — Commercial Banking Commercial real estate loans — — — — 2 2,785 2,775 5 Commercial loans 1 134 126 104 2 284 276 104 Total Commercial Banking 1 134 126 104 4 3,069 3,051 109 Total 1 $ 134 126 104 4 $ 3,069 3,051 109 A TDR is considered to be in default when a restructured loan is 90 days or more past due. For the quarter ended September 30, 2018 For the nine months ended September 30, 2018 Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Number of contracts Recorded investment at the time of modification Current recorded investment Current allowance Personal Banking: Residential mortgage loans 2 $ 342 342 35 6 $ 616 612 62 Home equity loans 4 194 193 47 12 511 462 113 Total Personal Banking 6 536 535 82 18 1,127 1,074 175 Commercial Banking: Commercial real estate loans 3 372 361 42 5 3,255 3,198 97 Commercial loans 1 45 45 5 6 2,367 1,484 21 Total Commercial Banking 4 417 406 47 11 5,622 4,682 118 Total 10 $ 953 941 129 29 $ 6,749 5,756 293
Schedule of troubled debt restructurings (including re-modified TDRs) by type of modification by portfolio segment and by class of financing receivable	The following table provides information as of September 30, 2019 for TDRs (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended September 30, 2019 (in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 1 $ — — 121 — 121 Home equity loans 1 — — 11 — 11 Total Personal Banking 2 — — 132 — 132 Commercial Banking: Commercial real estate loans 8 — 222 4,898 — 5,120 Commercial loans 1 — — 41 — 41 Total Commercial Banking 9 — 222 4,939 — 5,161 Total 11 $ — 222 5,071 — 5,293 The following table provides information as of September 30, 2018 for TDRs (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the quarter ended September 30, 2018 (in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 2 $ — — 342 — 342 Home equity loans 4 193 — — — 193 Total Personal Banking 6 193 — 342 — 535 Commercial Banking: Commercial real estate loans 3 — — 361 — 361 Commercial loans 1 — — 45 — 45 Total Commercial Banking 4 — — 406 — 406 Total 10 $ 193 — 748 — 941 The following table provides information as of September 30, 2019 for TDRs (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the nine months ended September 30, 2019 (in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 1 $ — — 121 — 121 Home equity loans 1 — — 11 — 11 Total Personal Banking 2 — — 132 — 132 Commercial Banking: Commercial real estate loans 9 — 519 4,898 — 5,417 Commercial loans 2 — — 50 — 50 Total Commercial Banking 11 — 519 4,948 — 5,467 Total 13 $ — 519 5,080 — 5,599 The following table provides information as of September 30, 2018 for TDRs (including re-modified TDRs) by type of modification, by portfolio segment and class of financing receivable for modifications during the nine months ended September 30, 2018 (in thousands): Type of modification Number of contracts Rate Payment Maturity date Other Total Personal Banking: Residential mortgage loans 6 $ 7 — 519 86 612 Home equity loans 12 222 — 47 193 462 Total Personal Banking 18 229 — 566 279 1,074 Commercial Banking: Commercial real estate loans 5 — 482 361 2,355 3,198 Commercial loans 6 — — 183 1,301 1,484 Total Commercial Banking 11 — 482 544 3,656 4,682 Total 29 $ 229 482 1,110 3,935 5,756
Schedule of re-modified troubled debt restructurings by portfolio segment and by class of financing receivable	The following table provides information related to loan payment delinquencies at September 30, 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 $ 1,171 5,185 10,116 16,472 2,792,485 2,808,957 — Home equity loans 3,407 1,724 4,875 10,006 1,059,900 1,069,906 — Consumer finance loans 98 43 1 142 730 872 — Consumer loans 7,221 2,557 3,190 12,968 1,040,188 1,053,156 — Total Personal Banking 11,897 9,509 18,182 39,588 4,893,303 4,932,891 — Commercial Banking: Commercial real estate loans 3,745 835 15,534 20,114 2,353,940 2,374,054 — Commercial loans 182 519 4,658 5,359 655,928 661,287 — Total Commercial Banking 3,927 1,354 20,192 25,473 3,009,868 3,035,341 — Total originated loans 15,824 10,863 38,374 65,061 7,903,171 7,968,232 — Acquired loans Personal Banking: Residential mortgage loans 65 135 1,700 1,900 85,276 87,176 94 Home equity loans 1,367 379 1,091 2,837 255,430 258,267 — Consumer loans 278 32 210 520 39,745 40,265 1 Total Personal Banking 1,710 546 3,001 5,257 380,451 385,708 95 Commercial Banking: Commercial real estate loans 1,563 1,058 6,758 9,379 429,406 438,785 — Commercial loans 180 70 1,083 1,333 57,959 59,292 — Total Commercial Banking 1,743 1,128 7,841 10,712 487,365 498,077 — Total acquired loans 3,453 1,674 10,842 15,969 867,816 883,785 95 Total loans $ 19,277 12,537 49,216 81,030 8,770,987 8,852,017 95 (1) Represents acquired loans that were originally recorded at fair value upon acquisition. These loans are considered to be accruing because we can reasonably estimate future cash flows on and expect to fully collect the carrying value of these loans. Therefore, we are accreting the difference between the carrying value and their expected cash flows into interest income.
Schedule of loan delinquencies	The following table provides information related to loan payment delinquencies at September 30, 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 $ 1,171 5,185 10,116 16,472 2,792,485 2,808,957 — Home equity loans 3,407 1,724 4,875 10,006 1,059,900 1,069,906 — Consumer finance loans 98 43 1 142 730 872 — Consumer loans 7,221 2,557 3,190 12,968 1,040,188 1,053,156 — Total Personal Banking 11,897 9,509 18,182 39,588 4,893,303 4,932,891 — Commercial Banking: Commercial real estate loans 3,745 835 15,534 20,114 2,353,940 2,374,054 — Commercial loans 182 519 4,658 5,359 655,928 661,287 — Total Commercial Banking 3,927 1,354 20,192 25,473 3,009,868 3,035,341 — Total originated loans 15,824 10,863 38,374 65,061 7,903,171 7,968,232 — Acquired loans Personal Banking: Residential mortgage loans 65 135 1,700 1,900 85,276 87,176 94 Home equity loans 1,367 379 1,091 2,837 255,430 258,267 — Consumer loans 278 32 210 520 39,745 40,265 1 Total Personal Banking 1,710 546 3,001 5,257 380,451 385,708 95 Commercial Banking: Commercial real estate loans 1,563 1,058 6,758 9,379 429,406 438,785 — Commercial loans 180 70 1,083 1,333 57,959 59,292 — Total Commercial Banking 1,743 1,128 7,841 10,712 487,365 498,077 — Total acquired loans 3,453 1,674 10,842 15,969 867,816 883,785 95 Total loans $ 19,277 12,537 49,216 81,030 8,770,987 8,852,017 95 (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 as of September 30, 2019 (in thousands): Pass Special mention Substandard Doubtful Loss Total loans receivable Originated loans Personal Banking: Residential mortgage loans $ 2,801,228 — 7,729 — — 2,808,957 Home equity loans 1,064,182 — 5,724 — — 1,069,906 Consumer finance loans 872 — — — — 872 Consumer loans 1,049,270 — 3,886 — — 1,053,156 Total Personal Banking 4,915,552 — 17,339 — — 4,932,891 Commercial Banking: Commercial real estate loans 2,209,327 63,051 101,495 181 — 2,374,054 Commercial loans 588,924 35,299 36,949 115 — 661,287 Total Commercial Banking 2,798,251 98,350 138,444 296 — 3,035,341 Total originated loans 7,713,803 98,350 155,783 296 — 7,968,232 Acquired loans Personal Banking: Residential mortgage loans 85,849 — 1,327 — — 87,176 Home equity loans 256,748 — 1,519 — — 258,267 Consumer loans 39,888 — 377 — — 40,265 Total Personal Banking 382,485 — 3,223 — — 385,708 Commercial Banking: Commercial real estate loans 391,698 6,329 40,758 — — 438,785 Commercial loans 51,074 2,367 5,851 — — 59,292 Total Commercial Banking 442,772 8,696 46,609 — — 498,077 Total acquired loans 825,257 8,696 49,832 — — 883,785 Total loans $ 8,539,060 107,046 205,615 296 — 8,852,017 The following table sets forth information about credit quality indicators as of 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)	9 Months Ended
	Sep. 30, 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): September 30, 2019 December 31, 2018 Amortizable intangible assets: Core deposit intangibles - gross $ 63,685 63,685 Acquisitions 7,498 — Less: accumulated amortization (49,487 ) (45,027 ) Core deposit intangibles - net 21,696 18,658 Customer and Contract intangible assets - gross 10,474 10,474 Less: accumulated amortization (9,760 ) (9,311 ) Customer and Contract intangible assets - net 714 1,163 Total intangible assets - net $ 22,410 19,821
Schedule of the actual aggregate amortization expense as well as estimated aggregate amortization expense, based upon current levels of intangible assets	The following table shows the actual aggregate amortization expense for the quarters ended September 30, 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 September 30, 2019 $ 1,702 For the quarter ended September 30, 2018 1,462 For the nine months ended September 30, 2019 4,909 For the nine months ended September 30, 2018 4,502 For the year ending December 31, 2019 6,495 For the year ending December 31, 2020 5,669 For the year ending December 31, 2021 4,572 For the year ending December 31, 2022 3,572 For the year ending December 31, 2023 2,695 For the year ending December 31, 2024 2,010
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 September 30, 2019 $ 344,720

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share	The following table sets forth the computation of basic and diluted EPS (in thousands, except share data and per share amounts): Quarter ended September 30, Nine months ended September 30, 2019 2018 2019 2018 Net income available to common shareholders $ 33,414 27,740 84,841 79,024 Weighted average common shares outstanding 105,517,707 102,334,954 104,626,560 101,937,338 Dilutive potential shares due to effect of stock options 752,837 1,607,741 1,055,055 1,566,731 Total weighted average common shares and dilutive potential shares 106,270,544 103,942,695 105,681,615 103,504,069 Basic earnings per share $ 0.32 0.27 0.81 0.78 Diluted earnings per share $ 0.31 0.27 0.80 0.76

Pension and Other Post-retire_2

Pension and Other Post-retirement Benefits (Tables)	9 Months Ended
	Sep. 30, 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 September 30, Pension benefits Other post-retirement benefits 2019 2018 2019 2018 Service cost $ 1,487 1,716 — — Interest cost 1,839 1,678 13 14 Expected return on plan assets (2,759 ) (2,992 ) — — Amortization of prior service cost (581 ) (581 ) — — Amortization of the net loss 856 872 17 24 Net periodic cost $ 842 693 30 38 Nine months ended September 30, Pension benefits Other post-retirement benefits 2019 2018 2019 2018 Service cost $ 4,462 5,148 — — Interest cost 5,515 5,034 39 41 Expected return on plan assets (8,278 ) (8,976 ) — — Amortization of prior service cost (1,742 ) (1,742 ) — — Amortization of the net loss 2,568 2,617 51 73 Net periodic cost $ 2,525 2,081 90 114

Disclosures About Fair Value _2

Disclosures About Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2019 (in thousands): Carrying amount Estimated fair value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 107,602 107,602 107,602 — — Securities available-for-sale 807,823 807,823 — 807,823 — Securities held-to-maturity 18,958 19,237 — 19,237 — Loans receivable, net 8,790,299 8,693,690 — — 8,693,690 Residential mortgage loans held-for-sale 8,859 8,859 — — 8,859 Accrued interest receivable 27,069 27,069 27,069 — — Interest rate lock commitments 505 505 — — 505 Forward commitments 215 215 — 215 — Interest rate swaps 26,181 26,181 — 26,181 — FHLB stock 21,401 21,401 — — — Total financial assets $ 9,808,912 9,712,582 134,671 853,456 8,703,054 Financial liabilities: Savings and checking deposits $ 7,048,049 7,048,049 7,048,049 — — Time deposits 1,633,451 1,644,309 — — 1,644,309 Borrowed funds 255,257 255,260 255,260 — — Junior subordinated debentures 121,787 116,872 — — 116,872 Interest rate swaps 26,257 26,257 — 26,257 — Accrued interest payable 1,314 1,314 1,314 — — Total financial liabilities $ 9,086,115 9,092,061 7,304,623 26,257 1,761,181 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 Residential mortgage loans held-for-sale — — — — — 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 September 30, 2019 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Debt securities: U.S. government and agencies $ — 14,965 — 14,965 Government sponsored enterprises — 119,833 — 119,833 States and political subdivisions — 29,390 — 29,390 Corporate — 918 — 918 Total debt securities — 165,106 — 165,106 Residential mortgage-backed securities: GNMA — 24,715 — 24,715 FNMA — 86,858 — 86,858 FHLMC — 53,209 — 53,209 Non-agency — 506 — 506 Collateralized mortgage obligations: GNMA — 144,829 — 144,829 FNMA — 200,873 — 200,873 FHLMC — 131,727 — 131,727 Total mortgage-backed securities — 642,717 — 642,717 Interest rate lock commitments — — 505 505 Forward commitments — 215 — 215 Interest rate swaps — 26,181 — 26,181 Total assets $ — 834,219 505 834,724 Interest rate swaps $ — 26,257 — 26,257 Total liabilities $ — 26,257 — 26,257 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 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, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents the changes in Level 3 assets and liabilities measured at fair value on a recurring basis (in thousands): For the quarter ended September 30, For the nine months ended September 30, 2019 2018 2019 2018 Beginning balance $ — — — — Total gains or losses Included in earnings — — — — Purchases 505 — 505 — Sales — — — — Transfers from Level 3 — — — — Transfers into Level 3 — — — — Ending balance $ 505 — 505 —
Schedule of fair value measurement for nonrecurring assets	The following table represents the fair market measurement for only those nonrecurring assets that had a fair market value below the carrying amount as of September 30, 2019 (in thousands): Level 1 Level 2 Level 3 Total assets at fair value Loans measured for impairment $ — — 40,603 40,603 Real estate owned — — 1,237 1,237 Total assets $ — — 41,840 41,840 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, net — — 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 September 30, 2019 (in thousands): Fair value Valuation techniques Significant unobservable inputs Range (weighted average) Loans measured for impairment $ 40,603 Appraisal value (1) Estimated cost to sell 10.0% Discounted cash flow Discount rate 4.25% to 11.0% (7.50%) Real estate owned $ 1,237 Appraisal value (1) Estimated cost to sell 10.0% (1) Fair value is generally determined through independent appraisals of the underlying collateral, which may include Level 3 inputs that are not identifiable, or by using the discounted cash flow method if the loan is not collateral dependent.

Derivative Financial Instrume_2

Derivative Financial Instruments - (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of derivatives not designated as hedging 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 September 30, 2019 Derivatives not designated as hedging instruments: Interest rate swap agreements $ 317,086 26,181 317,086 26,257 Interest rate lock commitments 25,331 505 — — Forward commitments 7,907 215 — — Total derivatives $ 350,324 26,901 317,086 26,257 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 September 30, For the nine months ended September 30, 2019 2018 2019 2018 Hedging derivatives: Increase in interest expense $ — 257 — 857 Non-hedging swap derivatives: Decrease in other income (125 ) — (195 ) (288 ) Increase in mortgage banking income 720 — 720 —

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Schedule of changes in accumulated other comprehensive income by component	The following tables show the changes in accumulated other comprehensive income/(loss) by component for the periods indicated (in thousands): For the quarter ended September 30, 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 June 30, 2019 $ 3,227 — (32,446 ) (29,219 ) Other comprehensive income before reclassification adjustments (1) 1,315 — — 1,315 Amounts reclassified from accumulated other comprehensive income (2), (3) (1 ) — 208 207 Net other comprehensive income 1,314 — 208 1,522 Balance as of September 30, 2019 $ 4,541 — (32,238 ) (27,697 ) For the quarter ended September 30, 2018 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of June 30, 2018 $ (10,693 ) (266 ) (32,134 ) (43,093 ) Other comprehensive income/(loss) before reclassification adjustments (4), (5) (1,970 ) 192 — (1,778 ) Amounts reclassified from accumulated other comprehensive income (6), (7) (44 ) — 226 182 Net other comprehensive income/(loss) (2,014 ) 192 226 (1,596 ) Balance as of September 30, 2018 $ (12,707 ) (74 ) (31,908 ) (44,689 ) (1) Consists of unrealized holding loss, net of tax of $(525) . (2) Consists of realized gain on securities (gain on sales of investments, net) of $ (1) , net of tax (income tax expense) of $ 0 . (3) Consists of amortization of prior service cost (compensation and employee benefits) of $(581) and amortization of net loss (compensation and employee benefits) of $890 , net of tax (income tax expense) of $(83) . (4) Consists of unrealized holding gain, net of tax $788 . (5) Change in fair value of interest rate swaps, net of tax $(51) . (6) Consists of realized gains on securities (gain on sales of investments, net) of $61 , net of tax (income tax expense) of $17 . (7) 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) . For the nine months ended September 30, 2019 Unrealized gains 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 (1) 11,376 — — 11,376 Amounts reclassified from accumulated other comprehensive income (2), (3) (3 ) — 626 623 Net other comprehensive income 11,373 — 626 11,999 Balance as of September 30, 2019 $ 4,541 — (32,238 ) (27,697 ) For the nine months ended September 30, 2018 Unrealized gains and (losses) on securities available- for-sale Change in fair value of interest rate swaps Change in defined benefit pension plans Total Balance as of December 31, 2017 $ (4,409 ) (691 ) (26,980 ) (32,080 ) Reclassification due to adoption of ASU No. 2018-02 (991 ) (149 ) (5,606 ) (6,746 ) Other comprehensive income/(loss) before reclassification adjustments (4), (5) (7,169 ) 766 — (6,403 ) Amounts reclassified from accumulated other comprehensive income (6), (7) (138 ) — 678 540 Net other comprehensive income/(loss) (7,307 ) 766 678 (5,863 ) Balance as of September 30, 2018 $ (12,707 ) (74 ) (31,908 ) (44,689 ) (1) Consists of unrealized holding loss, net of tax of $(4,549) . (2) Consists of realized gain on securities (gain on sales of investments, net) of $(1) , net of tax (income tax expense) of $1 . (3) Consists of amortization of prior service cost (compensation and employee benefits) of $(1,742) , and amortization of net loss (compensation and employee benefits) of $2,669 , net of tax (income tax expense) of $(250) . (4) Consists of unrealized holding gain, net of tax of $2,869 . (5) Change in fair value of interest rate swaps, net of tax of $(204) . (6) Consists of realized gains on securities (gain on sales of investments, net) of $192 , net of tax (income tax expense) of $ 54 . (7) Consists of amortization of prior service cost (compensation and employee benefits) of $1,742 and amortization of net loss (compensation and employee benefits) of $(2,691) , net of tax (income tax expense) of $(271) .

Basis of Presentation and Inf_3

Basis of Presentation and Informational Disclosures (Details)	May 22, 2019$ / sharesshares	Sep. 30, 2019USD ($)bank	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)bank	Sep. 30, 2018USD ($)	Jan. 01, 2019USD ($)	Dec. 31, 2018USD ($)
Stock Related Compensation
Number of banking locations | bank		182		182
Options exercise price (in dollars per share) | $ / shares	$ 17.27
Options weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.14
Stock-based compensation expense		$ 1,700,000	$ 1,300,000	$ 5,400,000	$ 4,500,000
Unrecognized tax benefits liability		0		0
Operating lease ROU assets (other assets)		48,857,000		48,857,000
Operating lease liabilities (other liabilities)		51,531,000		51,531,000
Retained earnings		577,018,000		577,018,000			$ 550,374,000
Accounting Standards Update 2016-02
Stock Related Compensation
Operating lease ROU assets (other assets)						$ 40,200,000
Operating lease liabilities (other liabilities)						42,200,000
Retained earnings						$ 1,200,000
Employee Stock Option
Stock Related Compensation
Award vesting period	7 years
Compensation expense yet to be recognized		3,800,000		3,800,000
Restricted Stock
Stock Related Compensation
Restricted common shares weighted average grant date fair value (in dollars per share) | $ / shares	$ 17.27
Common stock
Stock Related Compensation
Compensation expense yet to be recognized		$ 18,500,000		$ 18,500,000
Employees
Stock Related Compensation
Options granted (in shares) | shares	547,410
Employees | Restricted Stock
Stock Related Compensation
Restricted common shares granted (in shares) | shares	256,800
Director
Stock Related Compensation
Options granted (in shares) | shares	64,800
Director | Restricted Stock
Stock Related Compensation
Restricted common shares granted (in shares) | shares	24,300

Acquisition - Narrative (Detail

Acquisition - Narrative (Details) $ / shares in Units, $ in Thousands	Mar. 08, 2019USD ($)shareholderoffice$ / sharesshares	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)
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		$ 3,100
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	Sep. 30, 2019	Sep. 30, 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)	Sep. 30, 2019
Minimum
Lessee, Lease, Description [Line Items]
Lease renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease term of contract (up to)	35 years
Lease renewal term	10 years

Leases - Schedule of Lease Cost

Leases - Schedule of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease costs (office operations)	$ 1,443	$ 4,124
Variable lease costs (office operations)	264	455
Total operating lease costs	$ 1,707	$ 4,579

Leases - Schedule of Lease Asse

Leases - Schedule of Lease Assets and Liabilities (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
Operating lease ROU assets (other assets)	$ 48,857
Operating lease liabilities (other liabilities)	$ 51,531

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Cash Flow Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Leases [Abstract]
Operating cash flow from operating leases	$ 4,132
ROU assets obtained in exchange for lease obligations	$ 11,518
Weighted average remaining lease term	15 years 8 months 12 days
Weighted average discount rate	3.70%

Leases - Schedule of Lease Matu

Leases - Schedule of Lease Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2019	$ 1,444
2020	5,447
2021	5,115
2022	4,814
2023	4,559
Thereafter	49,087
Total lease payments	70,466
Less amount of lease payments representing interest	18,935
Total present value of lease payments	$ 51,531
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	Sep. 30, 2019	Dec. 31, 2018
Amortized cost
Residential mortgage-backed securities	$ 801,465	$ 811,015
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	9,195	2,958
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(2,837)	(12,523)
Fair value
Securities available-for-sale	807,823	801,450
U.S. government and agencies
Amortized cost
Due in less than one year	14,902
Due in one year through five years		14,756
Gross unrealized holding gains
Due in less than one year	63
Due in one year through five years		24
Gross unrealized holding losses
Due in less than one year	0
Due in one year through five years		0
Fair value
Due in less than one year	14,965
Due in one year through five years		14,780
Debt issued by government sponsored enterprises:
Amortized cost
Due in less than one year	55,099	85,089
Due in one year through five years	60,922	101,078
Due in five years through ten years	3,830
Due after ten years		3,546
Gross unrealized holding gains
Due in less than one year	260	0
Due in one year through five years	116	71
Due in five years through ten years	66
Due after ten years		0
Gross unrealized holding losses
Due in less than one year	(6)	(795)
Due in one year through five years	(340)	(1,512)
Due in five years through ten years	(114)
Due after ten years		(142)
Fair value
Due in less than one year	55,353	84,294
Due in one year through five years	60,698	99,637
Due in five years through ten years	3,782
Due after ten years		3,404
Municipal securities
Amortized cost
Due in less than one year	245	1,333
Due in one year through five years	3,799	3,985
Due in five years through ten years	11,052	10,603
Due after ten years	13,741	5,105
Gross unrealized holding gains
Due in less than one year	1	2
Due in one year through five years	81	54
Due in five years through ten years	154	60
Due after ten years	317	31
Gross unrealized holding losses
Due in less than one year	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 less than one year	246	1,329
Due in one year through five years	3,880	4,035
Due in five years through ten years	11,206	10,663
Due after ten years	14,058	5,136
Corporate debt securities
Amortized cost
Due in five years through ten years	918	914
Gross unrealized holding gains
Due in five years through ten years	0	0
Gross unrealized holding losses
Due in five years through ten years	0	0
Fair value
Due in five years through ten years	918	914
Residential mortgage-backed securities
Amortized cost
Residential mortgage-backed securities	636,957	584,606
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	8,137	2,716
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(2,377)	(10,064)
Fair value
Securities available-for-sale	642,717	577,258
Fixed rate | Pass-through
Amortized cost
Residential mortgage-backed securities	143,419	130,172
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	2,041	568
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(1,065)	(4,113)
Fair value
Securities available-for-sale	144,395	126,627
Fixed rate | Agency CMOs
Amortized cost
Residential mortgage-backed securities	415,760	365,427
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	5,026	865
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(1,190)	(5,921)
Fair value
Securities available-for-sale	419,596	360,371
Variable rate | Pass-through
Amortized cost
Residential mortgage-backed securities	20,063	24,761
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	834	1,003
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(4)	(5)
Fair value
Securities available-for-sale	20,893	25,759
Variable rate | Agency CMOs
Amortized cost
Residential mortgage-backed securities	57,715	64,246
Gross unrealized holding gains
Residential mortgage-backed securities, gross unrealized holding gains	236	280
Gross unrealized holding losses
Residential mortgage-backed securities, gross unrealized holding losses	(118)	(25)
Fair value
Securities available-for-sale	$ 57,833	$ 64,501

Investment securities and imp_4

Investment securities and impairment of investment securities - Held To Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized cost
Marketable securities held-to-maturity, amortized cost	$ 18,958	$ 22,765
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	279	103
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	0	(422)
Fair value
Marketable securities held-to-maturity, fair value	19,237	22,446
Residential mortgage-backed securities
Amortized cost
Marketable securities held-to-maturity, amortized cost	18,958	22,765
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	279	103
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	0	(422)
Fair value
Marketable securities held-to-maturity, fair value	19,237	22,446
Fixed rate | Pass-through
Amortized cost
Marketable securities held-to-maturity, amortized cost	2,317	2,896
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	86	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	2,403	2,949
Fixed rate | Agency CMOs
Amortized cost
Marketable securities held-to-maturity, amortized cost	14,711	17,552
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	148	0
Gross unrealized holding losses
Marketable securities held-to-maturity, gross unrealized holding losses	0	(422)
Fair value
Marketable securities held-to-maturity, fair value	14,859	17,130
Variable rate | Pass-through
Amortized cost
Marketable securities held-to-maturity, amortized cost	1,317	1,666
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	36	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	1,353	1,705
Variable rate | Agency CMOs
Amortized cost
Marketable securities held-to-maturity, amortized cost	613	651
Gross unrealized holding gains
Marketable securities held-to-maturity, gross unrealized holding gains	9	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	$ 622	$ 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	Sep. 30, 2019	Dec. 31, 2018
Marketable securities
Less than 12 months - Fair value	$ 79,196	$ 34,960
Less than 12 months - Unrealized loss	(287)	(31)
12 months or more - Fair value	191,493	484,809
12 months or more - Unrealized loss	(2,550)	(12,915)
Total - Fair value	270,689	519,769
Total - Unrealized loss	(2,837)	(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	67,610	136,425
12 months or more - Unrealized loss	(460)	(2,449)
Total - Fair value	67,610	136,425
Total - Unrealized loss	(460)	(2,449)
Municipal securities
Marketable securities
Less than 12 months - Fair value	0	929
Less than 12 months - Unrealized loss	0	(1)
12 months or more - Fair value	0	1,709
12 months or more - Unrealized loss	0	(10)
Total - Fair value	0	2,638
Total - Unrealized loss	0	(11)
Residential mortgage-backed securities | Agency CMOs
Marketable securities
Less than 12 months - Fair value	79,196	34,031
Less than 12 months - Unrealized loss	(287)	(30)
12 months or more - Fair value	123,883	346,675
12 months or more - Unrealized loss	(2,090)	(10,456)
Total - Fair value	203,079	380,706
Total - Unrealized loss	$ (2,377)	$ (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	9 Months Ended
	Sep. 30, 2019	Sep. 30, 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 ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	$ 9,063,565		$ 8,257,652
Deferred loan costs	50,455		37,618
Allowance for loan losses	(52,859)	$ (53,107)	(55,214)	$ (55,975)	$ (57,332)	$ (56,795)
Total loans receivable, net	8,799,158		7,996,225
Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(15,576)		(11,513)
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(188,924)		(167,553)
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(57,503)		(64,765)
Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	5,283,720		4,956,500
Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,891,968		2,860,212
Residential mortgage loans held-for-sale	8,859		0
Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	1,328,173		1,258,422
Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	872		3,817
Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	1,062,707		834,049
Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	3,779,845		3,301,152
Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	3,001,763		2,639,374
Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	778,082		661,778
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	8,174,878		7,618,512
Deferred loan costs	49,921		36,820
Allowance for loan losses	(47,417)	(48,429)	(51,751)	(51,473)	(51,138)	(50,572)
Total loans receivable, net	7,920,815		7,361,434
Originated | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(15,576)		(11,513)
Originated | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(184,634)		(167,029)
Originated | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(56,357)		(63,605)
Originated | Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	4,898,546		4,589,503
Allowance for loan losses	(17,473)	(17,665)	(18,318)	(20,049)	(19,610)	(20,339)
Originated | Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,804,792		2,766,430
Allowance for loan losses	(2,507)	(3,909)	(4,054)	(4,144)	(3,657)	(3,824)
Originated | Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	1,069,906		1,043,878
Allowance for loan losses	(2,791)	(2,990)	(3,184)	(3,234)	(3,839)	(4,072)
Originated | Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	872		3,817
Allowance for loan losses	(140)	(266)	(676)	(1,650)	(2,354)	(3,968)
Originated | Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	1,022,976		775,378
Allowance for loan losses	(12,035)	(10,500)	(10,404)	(11,021)	(9,760)	(8,475)
Originated | Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	3,276,332		3,029,009
Allowance for loan losses	(29,944)	(30,764)	(33,433)	(31,424)	(31,528)	(30,233)
Originated | Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	2,558,688		2,416,047
Allowance for loan losses	(20,215)	(20,962)	(26,379)	(25,694)	(21,019)	(19,911)
Originated | Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	717,644		612,962
Allowance for loan losses	(9,729)	(9,802)	(7,054)	(5,730)	(10,509)	(10,322)
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	888,687		639,140
Deferred loan costs	534		798
Allowance for loan losses	(5,442)	(4,678)	(3,463)	(4,502)	(6,194)	(6,223)
Total loans receivable, net	878,343		634,791
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	(4,290)		(524)
Acquired | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Undisbursed loan proceeds	(1,146)		(1,160)
Acquired | Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	385,174		366,997
Allowance for loan losses	(941)	(959)	(850)	(954)	(1,747)	(1,783)
Acquired | Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	87,176		93,782
Allowance for loan losses	(92)	(104)	(83)	(102)	(170)	(131)
Acquired | Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	258,267		214,544
Allowance for loan losses	(295)	(344)	(348)	(408)	(662)	(762)
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	39,731		58,671
Allowance for loan losses	(554)	(511)	(419)	(444)	(915)	(890)
Acquired | Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	503,513		272,143
Allowance for loan losses	(4,501)	(3,719)	(2,613)	(3,548)		(4,440)
Acquired | Commercial Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses				(2,876)	(3,422)
Acquired | Commercial Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses				(672)	(1,025)
Acquired | Commercial Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses				(3,548)	$ (4,447)
Acquired | Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	443,075		223,327
Allowance for loan losses	(3,622)	(2,571)	(1,996)	(2,876)		(3,549)
Acquired | Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, gross	60,438		48,816
Allowance for loan losses	$ (879)	$ (1,148)	$ (617)	$ (672)		$ (891)

Loans receivable - Outstanding

Loans receivable - Outstanding Principal Balance and Related Carrying Value of Acquired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	$ 896,681	$ 645,359
Carrying value	883,785	638,254
Acquired loans evaluated individually for future credit losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	7,616	8,189
Carrying value	5,150	5,690
Acquired loans evaluated collectively for future credit losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	889,065	637,170
Carrying value	$ 878,635	$ 632,564

Loans receivable - Changes in t

Loans receivable - Changes in the Accretable Discount (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Changes in accretable yield
Beginning balance	$ 755	$ 1,540
Accretion	(382)	(785)
Net reclassification from nonaccretable yield	938	0
Ending balance	$ 1,311	$ 755

Loans receivable - Composition

Loans receivable - Composition of Acquired Impaired Loans by Portfolio Segment and by Class of Financing Receivable (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	$ 88,805	$ 98,283
Average recorded investment in impaired loans	87,902	84,338
Interest income recognized	2,750	3,762
Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	32,816	35,723
Average recorded investment in impaired loans	31,975	33,824
Interest income recognized	1,136	1,656
Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	19,970	22,508
Average recorded investment in impaired loans	19,522	20,733
Interest income recognized	608	910
Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	8,706	8,893
Average recorded investment in impaired loans	8,709	9,075
Interest income recognized	348	511
Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	4,139	4,300
Average recorded investment in impaired loans	3,744	3,992
Interest income recognized	180	235
Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	55,989	62,560
Average recorded investment in impaired loans	55,927	50,514
Interest income recognized	1,614	2,106
Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	44,522	49,919
Average recorded investment in impaired loans	45,828	41,328
Interest income recognized	1,295	1,599
Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	11,467	12,641
Average recorded investment in impaired loans	10,099	9,186
Interest income recognized	319	507
Acquired loans evaluated individually for future credit losses
Composition of impaired loans by portfolio segment and by class of financing receivable
Carrying value	5,150	5,690
Outstanding principal balance	7,616	8,189
Related impairment reserve	22	18
Average recorded investment in impaired loans	5,420	6,940
Interest income recognized	382	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	1,657	2,027
Outstanding principal balance	3,207	3,633
Related impairment reserve	20	17
Average recorded investment in impaired loans	1,842	2,830
Interest income recognized	178	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	908	990
Outstanding principal balance	1,516	1,598
Related impairment reserve	3	6
Average recorded investment in impaired loans	949	1,294
Interest income recognized	78	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	739	1,008
Outstanding principal balance	1,651	1,959
Related impairment reserve	16	7
Average recorded investment in impaired loans	874	1,483
Interest income recognized	89	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	10	29
Outstanding principal balance	40	76
Related impairment reserve	1	4
Average recorded investment in impaired loans	19	53
Interest income recognized	11	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	3,493	3,663
Outstanding principal balance	4,409	4,556
Related impairment reserve	2	1
Average recorded investment in impaired loans	3,578	4,110
Interest income recognized	204	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	3,415	3,584
Outstanding principal balance	4,324	4,471
Related impairment reserve	2	1
Average recorded investment in impaired loans	3,500	4,028
Interest income recognized	201	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	78	79
Outstanding principal balance	85	85
Related impairment reserve	0	0
Average recorded investment in impaired loans	78	82
Interest income recognized	$ 3	$ 9

Loans receivable - Changes in_2

Loans receivable - Changes in the Allowance for Losses on Loans Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	$ 53,107	$ 57,332	$ 55,214	$ 56,795
Current period provision	3,302	6,982	14,436	16,540
Charge-offs	(5,274)	(10,399)	(21,485)	(22,483)
Recoveries	1,724	2,060	4,694	5,123
Balance at the end of the period	52,859	55,975	52,859	55,975
Originated
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	48,429	51,138	51,751	50,572
Current period provision	2,089	8,504	9,374	17,395
Charge-offs	(4,639)	(10,098)	(17,302)	(21,007)
Recoveries	1,538	1,929	3,594	4,513
Balance at the end of the period	47,417	51,473	47,417	51,473
Originated | Personal Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	17,665	19,610	18,318	20,339
Current period provision	2,337	3,726	6,782	9,890
Charge-offs	(3,260)	(4,364)	(9,875)	(13,252)
Recoveries	731	1,077	2,248	3,072
Balance at the end of the period	17,473	20,049	17,473	20,049
Originated | Personal Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	3,909	3,657	4,054	3,824
Current period provision	(1,361)	491	(991)	678
Charge-offs	(109)	(204)	(847)	(710)
Recoveries	68	200	291	352
Balance at the end of the period	2,507	4,144	2,507	4,144
Originated | Personal Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	2,990	3,839	3,184	4,072
Current period provision	(81)	(351)	36	(164)
Charge-offs	(176)	(323)	(536)	(866)
Recoveries	58	69	107	192
Balance at the end of the period	2,791	3,234	2,791	3,234
Originated | Personal Banking | Consumer finance loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	266	2,354	676	3,968
Current period provision	(141)	(437)	(561)	(469)
Charge-offs	(59)	(445)	(296)	(2,484)
Recoveries	74	178	321	635
Balance at the end of the period	140	1,650	140	1,650
Originated | Personal Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	10,500	9,760	10,404	8,475
Current period provision	3,920	4,023	8,298	9,845
Charge-offs	(2,916)	(3,392)	(8,196)	(9,192)
Recoveries	531	630	1,529	1,893
Balance at the end of the period	12,035	11,021	12,035	11,021
Originated | Commercial Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	30,764	31,528	33,433	30,233
Current period provision	(248)	4,778	2,592	7,505
Charge-offs	(1,379)	(5,734)	(7,427)	(7,755)
Recoveries	807	852	1,346	1,441
Balance at the end of the period	29,944	31,424	29,944	31,424
Originated | Commercial Banking | Commercial real estate loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	20,962	21,019	26,379	19,911
Current period provision	(1,206)	8,723	(2,177)	10,417
Charge-offs	(261)	(4,820)	(4,978)	(5,702)
Recoveries	720	772	991	1,068
Balance at the end of the period	20,215	25,694	20,215	25,694
Originated | Commercial Banking | Commercial loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	9,802	10,509	7,054	10,322
Current period provision	958	(3,945)	4,769	(2,912)
Charge-offs	(1,118)	(914)	(2,449)	(2,053)
Recoveries	87	80	355	373
Balance at the end of the period	9,729	5,730	9,729	5,730
Acquired
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	4,678	6,194	3,463	6,223
Current period provision	1,213	(1,522)	5,062	(855)
Charge-offs	(635)	(301)	(4,183)	(1,476)
Recoveries	186	131	1,100	610
Balance at the end of the period	5,442	4,502	5,442	4,502
Acquired | Personal Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	959	1,747	850	1,783
Current period provision	324	(691)	430	(316)
Charge-offs	(474)	(191)	(742)	(881)
Recoveries	132	89	403	368
Balance at the end of the period	941	954	941	954
Acquired | Personal Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	104	170	83	131
Current period provision	41	(70)	50	(38)
Charge-offs	(81)	(10)	(97)	(94)
Recoveries	28	12	56	103
Balance at the end of the period	92	102	92	102
Acquired | Personal Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	344	662	348	762
Current period provision	220	(173)	249	85
Charge-offs	(290)	(103)	(472)	(578)
Recoveries	21	22	170	139
Balance at the end of the period	295	408	295	408
Acquired | Personal Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	511	915	419	890
Current period provision	63	(448)	131	(363)
Charge-offs	(103)	(78)	(173)	(209)
Recoveries	83	55	177	126
Balance at the end of the period	554	444	554	444
Acquired | Commercial Banking
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	3,719		2,613	4,440
Current period provision	889		4,632	(539)
Charge-offs	(161)		(3,441)	(595)
Recoveries	54		697	242
Balance at the end of the period	4,501	3,548	4,501	3,548
Acquired | Commercial Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period		3,422
Current period provision		(532)
Charge-offs		(39)
Recoveries		25
Balance at the end of the period		2,876		2,876
Acquired | Commercial Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period		1,025
Current period provision		(299)
Charge-offs		(71)
Recoveries		17
Balance at the end of the period		672		672
Acquired | Commercial Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period		4,447
Current period provision		(831)
Charge-offs		(110)
Recoveries		42
Balance at the end of the period		3,548		3,548
Acquired | Commercial Banking | Commercial real estate loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	2,571		1,996	3,549
Current period provision	1,155		1,432	(688)
Charge-offs	(128)		(382)	(147)
Recoveries	24		576	162
Balance at the end of the period	3,622	2,876	3,622	2,876
Acquired | Commercial Banking | Commercial loans
Changes in allowance for losses on allocated loans receivable
Balance at the beginning of the period	1,148		617	891
Current period provision	(266)		3,200	149
Charge-offs	(33)		(3,059)	(448)
Recoveries	30		121	80
Balance at the end of the period	$ 879	$ 672	$ 879	$ 672

Loans receivable - Loan Portfol

Loans receivable - Loan Portfolio by Portfolio Segment and by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 8,852,017		$ 8,051,439
Allowance for loan losses	52,859		55,214
Nonaccrual loans	65,657		72,281
Loans past due 90 days or more and still accruing	85		166
TDRs	30,300	$ 31,269	33,608	$ 29,147	$ 30,662	$ 32,104
Allowance related to TDRs	3,007		3,089
Additional commitments to customers with loans classified as TDRs	671		388
Nonaccrual TDRs	9,138		15,300	$ 9,777
Personal Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	5,318,599		4,982,605
Allowance for loan losses	18,414		19,168
Nonaccrual loans	24,668		27,245
Loans past due 90 days or more and still accruing	85		166
TDRs	9,382		9,884
Allowance related to TDRs	959		2,513
Additional commitments to customers with loans classified as TDRs	26		4
Personal Banking | Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	2,896,133		2,864,470
Allowance for loan losses	2,599		4,137
Nonaccrual loans	13,417		15,848
Loans past due 90 days or more and still accruing	0		0
TDRs	7,453		5,382
Allowance related to TDRs	565		993
Additional commitments to customers with loans classified as TDRs			0
Personal Banking | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,328,173		1,258,422
Allowance for loan losses	3,086		3,532
Nonaccrual loans	7,111		7,075
Loans past due 90 days or more and still accruing	0		136
TDRs	1,929		4,502
Allowance related to TDRs	394		1,520
Additional commitments to customers with loans classified as TDRs	26		4
Personal Banking | Consumer finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	872		3,817
Allowance for loan losses	140		676
Nonaccrual loans	1		22
Loans past due 90 days or more and still accruing	35		3
TDRs	0		0
Allowance related to TDRs	0		0
Additional commitments to customers with loans classified as TDRs			0
Personal Banking | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,093,421		855,896
Allowance for loan losses	12,589		10,823
Nonaccrual loans	4,139		4,300
Loans past due 90 days or more and still accruing	50		27
TDRs	0		0
Allowance related to TDRs	0		0
Additional commitments to customers with loans classified as TDRs			0
Commercial Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	3,533,418		3,068,834
Allowance for loan losses	34,445		36,046
Nonaccrual loans	40,989		45,036
Loans past due 90 days or more and still accruing	0		0
TDRs	20,918		23,724
Allowance related to TDRs	2,048		576
Additional commitments to customers with loans classified as TDRs	645		384
Commercial Banking | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	2,812,839		2,471,821
Allowance for loan losses	23,837		28,375
Nonaccrual loans	31,427		36,935
Loans past due 90 days or more and still accruing	0		0
TDRs	17,840		19,859
Allowance related to TDRs	1,398		313
Additional commitments to customers with loans classified as TDRs	475		310
Commercial Banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	720,579		597,013
Allowance for loan losses	10,608		7,671
Nonaccrual loans	9,562		8,101
Loans past due 90 days or more and still accruing	0		0
TDRs	3,078		3,865
Allowance related to TDRs	650		263
Additional commitments to customers with loans classified as TDRs	$ 170		$ 74

Loans receivable - Compositio_2

Loans receivable - Composition of Impaired Loans by Portfolio Segment and Class of Financing Receivable (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	$ 65,657	$ 72,281
Total impaired loans	88,805	98,283
Average recorded investment in impaired loans	87,902	84,338
Interest income recognized on impaired loans	2,750	3,762
Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	24,668	27,245
Total impaired loans	32,816	35,723
Average recorded investment in impaired loans	31,975	33,824
Interest income recognized on impaired loans	1,136	1,656
Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	13,417	15,848
Total impaired loans	19,970	22,508
Average recorded investment in impaired loans	19,522	20,733
Interest income recognized on impaired loans	608	910
Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	7,111	7,075
Total impaired loans	8,706	8,893
Average recorded investment in impaired loans	8,709	9,075
Interest income recognized on impaired loans	348	511
Personal Banking | Consumer finance loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	1	22
Total impaired loans	1	22
Average recorded investment in impaired loans	0	24
Interest income recognized on impaired loans	0	0
Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	4,139	4,300
Total impaired loans	4,139	4,300
Average recorded investment in impaired loans	3,744	3,992
Interest income recognized on impaired loans	180	235
Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	40,989	45,036
Total impaired loans	55,989	62,560
Average recorded investment in impaired loans	55,927	50,514
Interest income recognized on impaired loans	1,614	2,106
Commercial Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	31,427	36,935
Total impaired loans	44,522	49,919
Average recorded investment in impaired loans	45,828	41,328
Interest income recognized on impaired loans	1,295	1,599
Commercial Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	9,562	8,101
Total impaired loans	11,467	12,641
Average recorded investment in impaired loans	10,099	9,186
Interest income recognized on impaired loans	319	507
90 Days or greater delinquent
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	49,121	50,730
90 Days or greater delinquent | Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	21,088	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	11,722	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	5,966	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	1	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	3,399	3,228
90 Days or greater delinquent | Commercial Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	28,033	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	22,292	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	5,741	3,010
Less than 90 days delinquent
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	16,536	21,551
Loans less than 90 days delinquent reviewed for impairment	5,799	11,002
TDRs less than 90 days delinquent not included elsewhere	17,349	15,000
Less than 90 days delinquent | Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	3,580	5,034
Loans less than 90 days delinquent reviewed for impairment	505	0
TDRs less than 90 days delinquent not included elsewhere	7,643	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	1,695	2,883
Loans less than 90 days delinquent reviewed for impairment	505	0
TDRs less than 90 days delinquent not included elsewhere	6,048	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	1,145	1,079
Loans less than 90 days delinquent reviewed for impairment	0	0
TDRs less than 90 days delinquent not included elsewhere	1,595	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	0
Loans less than 90 days delinquent reviewed for impairment	0	0
TDRs less than 90 days delinquent not included elsewhere	0	0
Less than 90 days delinquent | Personal Banking | Consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans	740	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	12,956	16,517
Loans less than 90 days delinquent reviewed for impairment	5,294	11,002
TDRs less than 90 days delinquent not included elsewhere	9,706	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	9,135	11,426
Loans less than 90 days delinquent reviewed for impairment	4,897	8,549
TDRs less than 90 days delinquent not included elsewhere	8,198	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	3,821	5,091
Loans less than 90 days delinquent reviewed for impairment	397	2,453
TDRs less than 90 days delinquent not included elsewhere	$ 1,508	$ 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	Sep. 30, 2019	Dec. 31, 2018
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	$ 8,801,237	$ 7,997,835
Loans individually evaluated for impairment	50,780	53,604
Loans individually evaluated for impairment for which there is a related impairment reserve	45,612	48,875
Related impairment reserve	5,010	8,542
Loans individually evaluated for impairment for which there is no related reserve	5,168	4,729
Personal Banking
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	5,308,815	4,972,298
Loans individually evaluated for impairment	9,784	10,307
Loans individually evaluated for impairment for which there is a related impairment reserve	9,784	10,307
Related impairment reserve	963	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	2,888,290	2,856,359
Loans individually evaluated for impairment	7,843	8,111
Loans individually evaluated for impairment for which there is a related impairment reserve	7,843	8,111
Related impairment reserve	566	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	1,326,245	1,256,255
Loans individually evaluated for impairment	1,928	2,167
Loans individually evaluated for impairment for which there is a related impairment reserve	1,928	2,167
Related impairment reserve	394	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	872	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	1,093,408	855,867
Loans individually evaluated for impairment	13	29
Loans individually evaluated for impairment for which there is a related impairment reserve	13	29
Related impairment reserve	3	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	3,492,422	3,025,537
Loans individually evaluated for impairment	40,996	43,297
Loans individually evaluated for impairment for which there is a related impairment reserve	35,828	38,568
Related impairment reserve	4,047	7,266
Loans individually evaluated for impairment for which there is no related reserve	5,168	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	2,780,752	2,436,605
Loans individually evaluated for impairment	32,087	35,216
Loans individually evaluated for impairment for which there is a related impairment reserve	28,375	31,830
Related impairment reserve	3,142	6,499
Loans individually evaluated for impairment for which there is no related reserve	3,712	3,386
Commercial Banking | Commercial loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	711,670	588,932
Loans individually evaluated for impairment	8,909	8,081
Loans individually evaluated for impairment for which there is a related impairment reserve	7,453	6,738
Related impairment reserve	905	767
Loans individually evaluated for impairment for which there is no related reserve	$ 1,456	$ 1,343

Loans receivable - Roll Forward

Loans receivable - Roll Forward of Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)contract	Sep. 30, 2018USD ($)contract	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)contract	Sep. 30, 2018USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2018USD ($)contract	Dec. 31, 2018USD ($)
Number of contracts
Beginning balance | contract	183	205			195			205
Number of contracts new TDRs | contract	3	7			5			26
Number of re-modified TDRs	8	3		8	8		3	3
Ending balance | contract	177	197			177			197
Amount
Beginning TDR balance	$ 31,269	$ 30,662	$ 33,608			$ 32,104
New TDRs	520	647	826			6,443
Re-modified TDRs	4,773	306	4,773			306
Net paydowns	(5,668)	(1,215)	(6,454)			(3,037)
Ending TDR balance	30,300	29,147	30,300			29,147
Accruing TDRs	21,162	19,370	21,162	$ 21,162	$ 21,162	19,370	$ 19,370	$ 19,370
Non-accrual TDRs	$ 9,138	$ 9,777	9,138	$ 9,138	$ 9,138	9,777	$ 9,777	$ 9,777	$ 15,300
Residential mortgage loans
Number of contracts
Number of contracts charged off | contract	0	0			0			1
Number of contracts paid off | contract	0	2			4			4
Amount
Amount of contracts charged off	$ 0	$ 0	0			(135)
Amount of contracts paid off	$ 0	$ (2)	(180)			(257)
Home equity loans
Number of contracts
Number of contracts charged off | contract	0	0			0			0
Number of contracts paid off | contract	3	2			7			4
Amount
Amount of contracts charged off	$ 0	$ 0	0			0
Amount of contracts paid off	$ (68)	$ (12)	(143)			(59)
Commercial real estate loans
Number of contracts
Number of contracts charged off | contract	0	1			0			2
Number of contracts paid off | contract	3	2			9			9
Amount
Amount of contracts charged off	$ 0	$ (91)	0			(294)
Amount of contracts paid off	$ (289)	$ (360)	(1,893)			(2,183)
Commercial loans
Number of contracts
Number of contracts charged off | contract	2	5			2			6
Number of contracts paid off | contract	1	3			1			8
Amount
Amount of contracts charged off	$ (235)	$ (619)	(235)			(1,340)
Amount of contracts paid off	$ (2)	$ (169)	$ (2)			$ (2,401)

Loans receivable - Troubled Deb

Loans receivable - Troubled Debt Restructuring (Including Re-Modified TDRs) by Portfolio Segment and by Class of Financing Receivable (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)contract	Sep. 30, 2018USD ($)contract	Sep. 30, 2019USD ($)contract	Sep. 30, 2018USD ($)contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	11	10	13	29
Recorded investment at the time of modification	$ 6,202	$ 953	$ 6,512	$ 6,749
Current recorded investment	5,293	941	5,599	5,756
Current allowance	$ 563	$ 129	$ 596	$ 293
Number of TDR contracts with subsequent default | contract	1		4	0
Recorded investment at the time of modification	$ 134		$ 3,069
Current recorded investment	126		3,051
Current allowance	$ 104		$ 109
Personal Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	2	6	2	18
Recorded investment at the time of modification	$ 133	$ 536	$ 133	$ 1,127
Current recorded investment	132	535	132	1,074
Current allowance	$ 10	$ 82	$ 10	$ 175
Number of TDR contracts with subsequent default | contract	0		0
Recorded investment at the time of modification	$ 0		$ 0
Current recorded investment	0		0
Current allowance	$ 0		$ 0
Personal Banking | Residential mortgage loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1	2	1	6
Recorded investment at the time of modification	$ 121	$ 342	$ 121	$ 616
Current recorded investment	121	342	121	612
Current allowance	$ 8	$ 35	$ 8	$ 62
Number of TDR contracts with subsequent default | contract	0		0
Recorded investment at the time of modification	$ 0		$ 0
Current recorded investment	0		0
Current allowance	$ 0		$ 0
Personal Banking | Home equity loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1	4	1	12
Recorded investment at the time of modification	$ 12	$ 194	$ 12	$ 511
Current recorded investment	11	193	11	462
Current allowance	$ 2	$ 47	$ 2	$ 113
Number of TDR contracts with subsequent default | contract	0		0
Recorded investment at the time of modification	$ 0		$ 0
Current recorded investment	0		0
Current allowance	$ 0		$ 0
Commercial Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	9	4	11	11
Recorded investment at the time of modification	$ 6,069	$ 417	$ 6,379	$ 5,622
Current recorded investment	5,161	406	5,467	4,682
Current allowance	$ 553	$ 47	$ 586	$ 118
Number of TDR contracts with subsequent default | contract	1		4
Recorded investment at the time of modification	$ 134		$ 3,069
Current recorded investment	126		3,051
Current allowance	$ 104		$ 109
Commercial Banking | Commercial real estate loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	8	3	9	5
Recorded investment at the time of modification	$ 6,014	$ 372	$ 6,314	$ 3,255
Current recorded investment	5,120	361	5,417	3,198
Current allowance	$ 549	$ 42	$ 581	$ 97
Number of TDR contracts with subsequent default | contract	0		2
Recorded investment at the time of modification	$ 0		$ 2,785
Current recorded investment	0		2,775
Current allowance	$ 0		$ 5
Commercial Banking | Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1	1	2	6
Recorded investment at the time of modification	$ 55	$ 45	$ 65	$ 2,367
Current recorded investment	41	45	50	1,484
Current allowance	$ 4	$ 5	$ 5	$ 21
Number of TDR contracts with subsequent default | contract	1		2
Recorded investment at the time of modification	$ 134		$ 284
Current recorded investment	126		276
Current allowance	$ 104		$ 104
Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Subsequent default measurement period			90 days

Loans receivable - Troubled D_2

Loans receivable - Troubled Debt Restructurings by Type of Modification (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)contract	Sep. 30, 2018USD ($)contract	Sep. 30, 2019USD ($)	Sep. 30, 2019	Sep. 30, 2019contract	Sep. 30, 2018USD ($)	Sep. 30, 2018	Sep. 30, 2018contract
Troubled debt restructurings
Number of contracts | contract	11	10			13			29
Troubled debt restructurings	$ 5,293	$ 941	$ 5,599			$ 5,756
Number of re-modified TDRs	8	3		8	8		3	3
Rate
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 193	0			229
Payment
Troubled debt restructurings
Troubled debt restructurings	222	0	519			482
Maturity date
Troubled debt restructurings
Troubled debt restructurings	5,071	748	5,080			1,110
Other
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 0	0			3,935
Personal Banking
Troubled debt restructurings
Number of contracts | contract	2	6			2			18
Troubled debt restructurings	$ 132	$ 535	132			1,074
Personal Banking | Rate
Troubled debt restructurings
Troubled debt restructurings	0	193	0			229
Personal Banking | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	0			0
Personal Banking | Maturity date
Troubled debt restructurings
Troubled debt restructurings	132	342	132			566
Personal Banking | Other
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 0	0			279
Personal Banking | Residential mortgage loans
Troubled debt restructurings
Number of contracts | contract	1	2			1			6
Troubled debt restructurings	$ 121	$ 342	121			612
Personal Banking | Residential mortgage loans | Rate
Troubled debt restructurings
Troubled debt restructurings	0	0	0			7
Personal Banking | Residential mortgage loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	0			0
Personal Banking | Residential mortgage loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	121	342	121			519
Personal Banking | Residential mortgage loans | Other
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 0	0			86
Personal Banking | Home equity loans
Troubled debt restructurings
Number of contracts | contract	1	4			1			12
Troubled debt restructurings	$ 11	$ 193	11			462
Personal Banking | Home equity loans | Rate
Troubled debt restructurings
Troubled debt restructurings	0	193	0			222
Personal Banking | Home equity loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	0			0
Personal Banking | Home equity loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	11	0	11			47
Personal Banking | Home equity loans | Other
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 0	0			193
Commercial Banking
Troubled debt restructurings
Number of contracts | contract	9	4			11			11
Troubled debt restructurings	$ 5,161	$ 406	5,467			4,682
Commercial Banking | Rate
Troubled debt restructurings
Troubled debt restructurings	0	0	0			0
Commercial Banking | Payment
Troubled debt restructurings
Troubled debt restructurings	222	0	519			482
Commercial Banking | Maturity date
Troubled debt restructurings
Troubled debt restructurings	4,939	406	4,948			544
Commercial Banking | Other
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 0	0			3,656
Commercial Banking | Commercial real estate loans
Troubled debt restructurings
Number of contracts | contract	8	3			9			5
Troubled debt restructurings	$ 5,120	$ 361	5,417			3,198
Commercial Banking | Commercial real estate loans | Rate
Troubled debt restructurings
Troubled debt restructurings	0	0	0			0
Commercial Banking | Commercial real estate loans | Payment
Troubled debt restructurings
Troubled debt restructurings	222	0	519			482
Commercial Banking | Commercial real estate loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	4,898	361	4,898			361
Commercial Banking | Commercial real estate loans | Other
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 0	0			2,355
Commercial Banking | Commercial loans
Troubled debt restructurings
Number of contracts | contract	1	1			2			6
Troubled debt restructurings	$ 41	$ 45	50			1,484
Commercial Banking | Commercial loans | Rate
Troubled debt restructurings
Troubled debt restructurings	0	0	0			0
Commercial Banking | Commercial loans | Payment
Troubled debt restructurings
Troubled debt restructurings	0	0	0			0
Commercial Banking | Commercial loans | Maturity date
Troubled debt restructurings
Troubled debt restructurings	41	45	50			183
Commercial Banking | Commercial loans | Other
Troubled debt restructurings
Troubled debt restructurings	$ 0	$ 0	$ 0			$ 1,301

Loans receivable - Loan Delinqu

Loans receivable - Loan Delinquencies (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Loan payment delinquencies
Total delinquency	$ 81,030	$ 121,534
Current	8,770,987	7,929,905
Total loans	8,852,017	8,051,439
90 days or greater delinquent and accruing	95	143
30-59 Days delinquent
Loan payment delinquencies
Total delinquency	19,277	53,010
60-89 Days delinquent
Loan payment delinquencies
Total delinquency	12,537	17,651
90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	49,216	50,873
Personal Banking
Loan payment delinquencies
Total loans	5,318,599	4,982,605
Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total loans	2,896,133	2,864,470
Personal Banking | Home equity loans
Loan payment delinquencies
Total loans	1,328,173	1,258,422
Personal Banking | Consumer finance loans
Loan payment delinquencies
Total loans	872	3,817
Personal Banking | Consumer loans
Loan payment delinquencies
Total loans	1,093,421	855,896
Commercial Banking
Loan payment delinquencies
Total loans	3,533,418	3,068,834
Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total loans	2,812,839	2,471,821
Commercial Banking | Commercial loans
Loan payment delinquencies
Total loans	720,579	597,013
Originated
Loan payment delinquencies
Total delinquency	65,061	109,605
Current	7,903,171	7,303,580
Total loans	7,968,232	7,413,185
90 days or greater delinquent and accruing	0	0
Originated | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	15,824	49,716
Originated | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	10,863	15,903
Originated | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	38,374	43,986
Originated | Personal Banking
Loan payment delinquencies
Total delinquency	39,588	73,809
Current	4,893,303	4,541,001
Total loans	4,932,891	4,614,810
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total delinquency	16,472	44,645
Current	2,792,485	2,714,474
Total loans	2,808,957	2,759,119
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Home equity loans
Loan payment delinquencies
Total delinquency	10,006	13,406
Current	1,059,900	1,030,472
Total loans	1,069,906	1,043,878
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Consumer finance loans
Loan payment delinquencies
Total delinquency	142	854
Current	730	2,963
Total loans	872	3,817
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | Consumer loans
Loan payment delinquencies
Total delinquency	12,968	14,904
Current	1,040,188	793,092
Total loans	1,053,156	807,996
90 days or greater delinquent and accruing	0	0
Originated | Personal Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	11,897	43,716
Originated | Personal Banking | 30-59 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	1,171	27,245
Originated | Personal Banking | 30-59 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	3,407	6,810
Originated | Personal Banking | 30-59 Days delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	98	661
Originated | Personal Banking | 30-59 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	7,221	9,000
Originated | Personal Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	9,509	10,542
Originated | Personal Banking | 60-89 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	5,185	5,732
Originated | Personal Banking | 60-89 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	1,724	1,771
Originated | Personal Banking | 60-89 Days delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	43	172
Originated | Personal Banking | 60-89 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	2,557	2,867
Originated | Personal Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	18,182	19,551
Originated | Personal Banking | 90 Days or greater delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	10,116	11,668
Originated | Personal Banking | 90 Days or greater delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	4,875	4,825
Originated | Personal Banking | 90 Days or greater delinquent | Consumer finance loans
Loan payment delinquencies
Total delinquency	1	21
Originated | Personal Banking | 90 Days or greater delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	3,190	3,037
Originated | Commercial Banking
Loan payment delinquencies
Total delinquency	25,473	35,796
Current	3,009,868	2,762,579
Total loans	3,035,341	2,798,375
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total delinquency	20,114	31,913
Current	2,353,940	2,217,105
Total loans	2,374,054	2,249,018
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | Commercial loans
Loan payment delinquencies
Total delinquency	5,359	3,883
Current	655,928	545,474
Total loans	661,287	549,357
90 days or greater delinquent and accruing	0	0
Originated | Commercial Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	3,927	6,000
Originated | Commercial Banking | 30-59 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	3,745	5,391
Originated | Commercial Banking | 30-59 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	182	609
Originated | Commercial Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	1,354	5,361
Originated | Commercial Banking | 60-89 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	835	4,801
Originated | Commercial Banking | 60-89 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	519	560
Originated | Commercial Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	20,192	24,435
Originated | Commercial Banking | 90 Days or greater delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	15,534	21,721
Originated | Commercial Banking | 90 Days or greater delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	4,658	2,714
Acquired
Loan payment delinquencies
Total delinquency	15,969	11,929
Current	867,816	626,325
Total loans	883,785	638,254
90 days or greater delinquent and accruing	95	143
Acquired | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	3,453	3,294
Acquired | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	1,674	1,748
Acquired | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	10,842	6,887
Acquired | Personal Banking
Loan payment delinquencies
Total delinquency	5,257	6,705
Current	380,451	361,090
Total loans	385,708	367,795
90 days or greater delinquent and accruing	95	65
Acquired | Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total delinquency	1,900	2,542
Current	85,276	91,240
Total loans	87,176	93,782
90 days or greater delinquent and accruing	94	19
Acquired | Personal Banking | Home equity loans
Loan payment delinquencies
Total delinquency	2,837	3,345
Current	255,430	211,199
Total loans	258,267	214,544
90 days or greater delinquent and accruing	0	40
Acquired | Personal Banking | Consumer loans
Loan payment delinquencies
Total delinquency	520	818
Current	39,745	58,651
Total loans	40,265	59,469
90 days or greater delinquent and accruing	1	6
Acquired | Personal Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	1,710	2,818
Acquired | Personal Banking | 30-59 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	65	532
Acquired | Personal Banking | 30-59 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	1,367	1,839
Acquired | Personal Banking | 30-59 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	278	447
Acquired | Personal Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	546	1,162
Acquired | Personal Banking | 60-89 Days delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	135	693
Acquired | Personal Banking | 60-89 Days delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	379	294
Acquired | Personal Banking | 60-89 Days delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	32	175
Acquired | Personal Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	3,001	2,725
Acquired | Personal Banking | 90 Days or greater delinquent | Residential mortgage loans
Loan payment delinquencies
Total delinquency	1,700	1,317
Acquired | Personal Banking | 90 Days or greater delinquent | Home equity loans
Loan payment delinquencies
Total delinquency	1,091	1,212
Acquired | Personal Banking | 90 Days or greater delinquent | Consumer loans
Loan payment delinquencies
Total delinquency	210	196
Acquired | Commercial Banking
Loan payment delinquencies
Total delinquency	10,712	5,224
Current	487,365	265,235
Total loans	498,077	270,459
90 days or greater delinquent and accruing	0	78
Acquired | Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total delinquency	9,379	4,564
Current	429,406	218,239
Total loans	438,785	222,803
90 days or greater delinquent and accruing	0	78
Acquired | Commercial Banking | Commercial loans
Loan payment delinquencies
Total delinquency	1,333	660
Current	57,959	46,996
Total loans	59,292	47,656
90 days or greater delinquent and accruing	0	0
Acquired | Commercial Banking | 30-59 Days delinquent
Loan payment delinquencies
Total delinquency	1,743	476
Acquired | Commercial Banking | 30-59 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	1,563	112
Acquired | Commercial Banking | 30-59 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	180	364
Acquired | Commercial Banking | 60-89 Days delinquent
Loan payment delinquencies
Total delinquency	1,128	586
Acquired | Commercial Banking | 60-89 Days delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	1,058	586
Acquired | Commercial Banking | 60-89 Days delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	70	0
Acquired | Commercial Banking | 90 Days or greater delinquent
Loan payment delinquencies
Total delinquency	7,841	4,162
Acquired | Commercial Banking | 90 Days or greater delinquent | Commercial real estate loans
Loan payment delinquencies
Total delinquency	6,758	3,866
Acquired | Commercial Banking | 90 Days or greater delinquent | Commercial loans
Loan payment delinquencies
Total delinquency	$ 1,083	$ 296

Loans receivable - Credit Quali

Loans receivable - Credit Quality Indicators (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Credit quality indicators
Total loans	$ 8,852,017,000	$ 8,051,439,000
Pass
Credit quality indicators
Total loans	8,539,060,000	7,753,667,000
Special mention
Credit quality indicators
Total loans	107,046,000	113,969,000
Substandard
Credit quality indicators
Total loans	205,615,000	183,803,000
Doubtful
Credit quality indicators
Total loans	296,000	0
Loss
Credit quality indicators
Total loans	0	0
Personal Banking
Credit quality indicators
Total loans	5,318,599,000	4,982,605,000
Personal Banking | Residential mortgage loans
Credit quality indicators
Total loans	2,896,133,000	2,864,470,000
Personal Banking | Home equity loans
Credit quality indicators
Total loans	1,328,173,000	1,258,422,000
Personal Banking | Consumer finance loans
Credit quality indicators
Total loans	872,000	3,817,000
Personal Banking | Consumer loans
Credit quality indicators
Total loans	1,093,421,000	855,896,000
Commercial Banking
Credit quality indicators
Total loans	3,533,418,000	3,068,834,000
Commercial Banking | Commercial real estate loans
Credit quality indicators
Total loans	2,812,839,000	2,471,821,000
Commercial Banking | Commercial loans
Credit quality indicators
Total loans	720,579,000	597,013,000
Originated
Credit quality indicators
Total loans	7,968,232,000	7,413,185,000
Originated | Pass
Credit quality indicators
Total loans	7,713,803,000	7,161,796,000
Originated | Special mention
Credit quality indicators
Total loans	98,350,000	106,902,000
Originated | Substandard
Credit quality indicators
Total loans	155,783,000	144,487,000
Originated | Doubtful
Credit quality indicators
Total loans	296,000	0
Originated | Loss
Credit quality indicators
Total loans	0	0
Originated | Personal Banking
Credit quality indicators
Total loans	4,932,891,000	4,614,810,000
Originated | Personal Banking | Pass
Credit quality indicators
Total loans	4,915,552,000	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	17,339,000	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	2,808,957,000	2,759,119,000
Originated | Personal Banking | Residential mortgage loans | Pass
Credit quality indicators
Total loans	2,801,228,000	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	7,729,000	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	1,069,906,000	1,043,878,000
Originated | Personal Banking | Home equity loans | Pass
Credit quality indicators
Total loans	1,064,182,000	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	5,724,000	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	872,000	3,817,000
Originated | Personal Banking | Consumer finance loans | Pass
Credit quality indicators
Total loans	872,000	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	1,053,156,000	807,996,000
Originated | Personal Banking | Consumer loans | Pass
Credit quality indicators
Total loans	1,049,270,000	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	3,886,000	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	3,035,341,000	2,798,375,000
Originated | Commercial Banking | Pass
Credit quality indicators
Total loans	2,798,251,000	2,566,393,000
Originated | Commercial Banking | Special mention
Credit quality indicators
Total loans	98,350,000	106,902,000
Originated | Commercial Banking | Substandard
Credit quality indicators
Total loans	138,444,000	125,080,000
Originated | Commercial Banking | Doubtful
Credit quality indicators
Total loans	296,000	0
Originated | Commercial Banking | Loss
Credit quality indicators
Total loans	0	0
Originated | Commercial Banking | Commercial real estate loans
Credit quality indicators
Total loans	2,374,054,000	2,249,018,000
Originated | Commercial Banking | Commercial real estate loans | Pass
Credit quality indicators
Total loans	2,209,327,000	2,062,728,000
Originated | Commercial Banking | Commercial real estate loans | Special mention
Credit quality indicators
Total loans	63,051,000	91,142,000
Originated | Commercial Banking | Commercial real estate loans | Substandard
Credit quality indicators
Total loans	101,495,000	95,148,000
Originated | Commercial Banking | Commercial real estate loans | Doubtful
Credit quality indicators
Total loans	181,000	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	661,287,000	549,357,000
Originated | Commercial Banking | Commercial loans | Pass
Credit quality indicators
Total loans	588,924,000	503,665,000
Originated | Commercial Banking | Commercial loans | Special mention
Credit quality indicators
Total loans	35,299,000	15,760,000
Originated | Commercial Banking | Commercial loans | Substandard
Credit quality indicators
Total loans	36,949,000	29,932,000
Originated | Commercial Banking | Commercial loans | Doubtful
Credit quality indicators
Total loans	115,000	0
Originated | Commercial Banking | Commercial loans | Loss
Credit quality indicators
Total loans	0	0
Acquired
Credit quality indicators
Total loans	883,785,000	638,254,000
Acquired | Pass
Credit quality indicators
Total loans	825,257,000	591,871,000
Acquired | Special mention
Credit quality indicators
Total loans	8,696,000	7,067,000
Acquired | Substandard
Credit quality indicators
Total loans	49,832,000	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	385,708,000	367,795,000
Acquired | Personal Banking | Pass
Credit quality indicators
Total loans	382,485,000	364,852,000
Acquired | Personal Banking | Special mention
Credit quality indicators
Total loans	0	0
Acquired | Personal Banking | Substandard
Credit quality indicators
Total loans	3,223,000	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	87,176,000	93,782,000
Acquired | Personal Banking | Residential mortgage loans | Pass
Credit quality indicators
Total loans	85,849,000	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	1,327,000	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	258,267,000	214,544,000
Acquired | Personal Banking | Home equity loans | Pass
Credit quality indicators
Total loans	256,748,000	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	1,519,000	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	40,265,000	59,469,000
Acquired | Personal Banking | Consumer loans | Pass
Credit quality indicators
Total loans	39,888,000	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	377,000	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	498,077,000	270,459,000
Acquired | Commercial Banking | Pass
Credit quality indicators
Total loans	442,772,000	227,019,000
Acquired | Commercial Banking | Special mention
Credit quality indicators
Total loans	8,696,000	7,067,000
Acquired | Commercial Banking | Substandard
Credit quality indicators
Total loans	46,609,000	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	438,785,000	222,803,000
Acquired | Commercial Banking | Commercial real estate loans | Pass
Credit quality indicators
Total loans	391,698,000	191,622,000
Acquired | Commercial Banking | Commercial real estate loans | Special mention
Credit quality indicators
Total loans	6,329,000	3,546,000
Acquired | Commercial Banking | Commercial real estate loans | Substandard
Credit quality indicators
Total loans	40,758,000	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	59,292,000	47,656,000
Acquired | Commercial Banking | Commercial loans | Pass
Credit quality indicators
Total loans	51,074,000	35,397,000
Acquired | Commercial Banking | Commercial loans | Special mention
Credit quality indicators
Total loans	2,367,000	3,521,000
Acquired | Commercial Banking | Commercial loans | Substandard
Credit quality indicators
Total loans	5,851,000	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		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Amortizable intangible assets:
Intangible asset - net	$ 22,410		$ 22,410		$ 19,821
Amortization expense	1,702	$ 1,462	4,909	$ 4,502
Estimated amortization expense
For the year ending December 31, 2019	6,495		6,495
For the year ending December 31, 2020	5,669		5,669
For the year ending December 31, 2021	4,572		4,572
For the year ending December 31, 2022	3,572		3,572
For the year ending December 31, 2023	2,695		2,695
For the year ending December 31, 2024	2,010		2,010
Core Deposits
Amortizable intangible assets:
Intangible asset - gross	63,685		63,685		63,685
Acquisitions			7,498		0
Less: accumulated amortization	(49,487)		(49,487)		(45,027)
Intangible asset - net	21,696		21,696		18,658
Customer and Contract
Amortizable intangible assets:
Intangible asset - gross	10,474		10,474		10,474
Less: accumulated amortization	(9,760)		(9,760)		(9,311)
Intangible asset - net	$ 714		$ 714		$ 1,163

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 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	Sep. 30, 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			$ 121,787,000			$ 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%	3.48%
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%
Effective rate (as a percent)			3.50%
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)			3.60%
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			172,200,000			128,600,000
Securities Sold under Agreements to Repurchase
Debt Instrument [Line Items]
Securities sold under agreements to repurchase			$ 83,100,000			$ 105,800,000

Guarantees (Details)

Guarantees (Details) - Letter of Credit $ in Thousands	Sep. 30, 2019USD ($)
Guarantor Obligations [Line Items]
Maximum potential amount of future payments	$ 39,600
Maximum exposure collateralized	32,800
Liability recognized for the obligations	$ 331

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stock options
Antidilutive securities excluded from the calculation of earnings per share
Average share price during the reporting period (in dollars per share)	$ 16.69	$ 18.01	$ 17.19	$ 17.30

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 33,414	$ 27,740	$ 84,841	$ 79,024
Weighted average common shares outstanding (in shares)	105,517,707	102,334,954	104,626,560	101,937,338
Dilutive potential shares due to effect of stock options (in shares)	752,837	1,607,741	1,055,055	1,566,731
Total weighted average common shares and dilutive potential shares (in shares)	106,270,544	103,942,695	105,681,615	103,504,069
Basic earnings per share (in dollars per share)	$ 0.32	$ 0.27	$ 0.81	$ 0.78
Diluted earnings per share (in dollars per share)	$ 0.31	$ 0.27	$ 0.80	$ 0.76

Pension and Other Post-retire_3

Pension and Other Post-retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension benefits
Components of net periodic benefit cost
Service cost	$ 1,487	$ 1,716	$ 4,462	$ 5,148
Interest cost	1,839	1,678	5,515	5,034
Expected return on plan assets	(2,759)	(2,992)	(8,278)	(8,976)
Amortization of prior service cost	(581)	(581)	(1,742)	(1,742)
Amortization of the net loss	856	872	2,568	2,617
Net periodic cost	842	693	2,525	2,081
Pension benefits | Minimum
Components of net periodic benefit cost
Estimated contribution for the current year	2,000		2,000
Pension benefits | Maximum
Components of net periodic benefit cost
Estimated contribution for the current year	4,000		4,000
Other post-retirement benefits
Components of net periodic benefit cost
Service cost	0	0	0	0
Interest cost	13	14	39	41
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of the net loss	17	24	51	73
Net periodic cost	$ 30	$ 38	$ 90	$ 114

Disclosures About Fair Value _3

Disclosures About Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Significant unrealized appreciation or depreciation in financial instruments	$ 0	$ 0
Financial assets:
Securities available-for-sale	807,823,000	801,450,000
Securities held-to-maturity	19,237,000	22,446,000
Accrued interest receivable	27,069,000	24,490,000
Derivative assets	26,901,000	6,445,000
Financial liabilities:
Borrowed funds	255,257,000	234,389,000
Junior subordinated debentures	121,787,000	111,213,000
Interest rate swaps	26,257,000	6,445,000
Level 1
Financial assets:
Cash and cash equivalents	107,602,000	68,789,000
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Loans receivable, net	0	0
Residential mortgage loans held-for-sale	0	0
Accrued interest receivable	27,069,000	24,490,000
FHLB stock	0	0
Total financial assets	134,671,000	93,279,000
Financial liabilities:
Savings and checking deposits	7,048,049,000	6,489,338,000
Time deposits	0	0
Borrowed funds	255,260,000	234,389,000
Junior subordinated debentures	0	0
Interest rate swaps	0	0
Accrued interest payable	1,314,000	744,000
Total financial liabilities	7,304,623,000	6,724,471,000
Level 2
Financial assets:
Cash and cash equivalents	0	0
Securities available-for-sale	807,823,000	801,450,000
Securities held-to-maturity	19,237,000	22,446,000
Loans receivable, net	0	0
Residential mortgage loans held-for-sale	0	0
Accrued interest receivable	0	0
FHLB stock	0	0
Total financial assets	853,456,000	830,341,000
Financial liabilities:
Savings and checking deposits	0	0
Time deposits	0	0
Borrowed funds	0	0
Junior subordinated debentures	0	0
Interest rate swaps	26,257,000	6,445,000
Accrued interest payable	0	0
Total financial liabilities	26,257,000	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	8,693,690,000	7,845,313,000
Residential mortgage loans held-for-sale	8,859,000	0
Accrued interest receivable	0	0
FHLB stock	0	0
Total financial assets	8,703,054,000	7,845,313,000
Financial liabilities:
Savings and checking deposits	0	0
Time deposits	1,644,309,000	1,434,410,000
Borrowed funds	0	0
Junior subordinated debentures	116,872,000	102,572,000
Interest rate swaps	0	0
Accrued interest payable	0	0
Total financial liabilities	1,761,181,000	1,536,982,000
Carrying amount
Financial assets:
Cash and cash equivalents	107,602,000	68,789,000
Securities available-for-sale	807,823,000	801,450,000
Securities held-to-maturity	18,958,000	22,765,000
Loans receivable, net	8,790,299,000	7,996,225,000
Residential mortgage loans held-for-sale	8,859,000	0
Accrued interest receivable	27,069,000	24,490,000
FHLB stock	21,401,000	15,635,000
Total financial assets	9,808,912,000	8,935,799,000
Financial liabilities:
Savings and checking deposits	7,048,049,000	6,489,338,000
Time deposits	1,633,451,000	1,404,841,000
Borrowed funds	255,257,000	234,389,000
Junior subordinated debentures	121,787,000	111,213,000
Interest rate swaps	26,257,000	6,445,000
Accrued interest payable	1,314,000	744,000
Total financial liabilities	9,086,115,000	8,246,970,000
Estimated fair value
Financial assets:
Cash and cash equivalents	107,602,000	68,789,000
Securities available-for-sale	807,823,000	801,450,000
Securities held-to-maturity	19,237,000	22,446,000
Loans receivable, net	8,693,690,000	7,845,313,000
Residential mortgage loans held-for-sale	8,859,000	0
Accrued interest receivable	27,069,000	24,490,000
FHLB stock	21,401,000	15,635,000
Total financial assets	9,712,582,000	8,784,568,000
Financial liabilities:
Savings and checking deposits	7,048,049,000	6,489,338,000
Time deposits	1,644,309,000	1,434,410,000
Borrowed funds	255,260,000	234,389,000
Junior subordinated debentures	116,872,000	102,572,000
Interest rate swaps	26,257,000	6,445,000
Accrued interest payable	1,314,000	744,000
Total financial liabilities	9,092,061,000	8,267,898,000
Interest rate lock commitments | Level 1
Financial assets:
Derivative assets	0
Interest rate lock commitments | Level 2
Financial assets:
Derivative assets	0
Interest rate lock commitments | Level 3
Financial assets:
Derivative assets	505,000
Interest rate lock commitments | Carrying amount
Financial assets:
Derivative assets	505,000
Interest rate lock commitments | Estimated fair value
Financial assets:
Derivative assets	505,000
Forward commitments | Level 1
Financial assets:
Derivative assets	0
Forward commitments | Level 2
Financial assets:
Derivative assets	215,000
Forward commitments | Level 3
Financial assets:
Derivative assets	0
Forward commitments | Carrying amount
Financial assets:
Derivative assets	215,000
Forward commitments | Estimated fair value
Financial assets:
Derivative assets	215,000
Interest rate swaps | Level 1
Financial assets:
Derivative assets	0	0
Interest rate swaps | Level 2
Financial assets:
Derivative assets	26,181,000	6,445,000
Interest rate swaps | Level 3
Financial assets:
Derivative assets	0	0
Interest rate swaps | Carrying amount
Financial assets:
Derivative assets	26,181,000	6,445,000
Interest rate swaps | Estimated fair value
Financial assets:
Derivative assets	$ 26,181,000	$ 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	Sep. 30, 2019	Dec. 31, 2018
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	$ 807,823	$ 801,450
Derivative assets	26,901	6,445
Interest rate swaps	26,257	6,445
Level 1
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Total financial assets	134,671	93,279
Interest rate swaps	0	0
Level 2
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	807,823	801,450
Total financial assets	853,456	830,341
Interest rate swaps	26,257	6,445
Level 3
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	0	0
Total financial assets	8,703,054	7,845,313
Interest rate swaps	0	0
Measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis
Derivative assets		6,445
Total financial assets	834,724	807,895
Interest rate swaps	26,257
Total liabilities	26,257	6,445
Measured on recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Derivative assets		0
Total financial assets	0	0
Interest rate swaps	0
Total liabilities	0	0
Measured on recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative assets		6,445
Total financial assets	834,219	807,895
Interest rate swaps	26,257
Total liabilities	26,257	6,445
Measured on recurring basis | Level 3
Assets and liabilities measured at fair value on a recurring basis
Derivative assets		0
Total financial assets	505	0
Interest rate swaps	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	165,106	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	14,965	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	119,833	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	29,390	21,163
Debt securities | Measured on recurring basis | Corporate
Assets and liabilities measured at fair value on a recurring basis
Securities available-for-sale	918	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	165,106	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	14,965	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	119,833	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	29,390	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	918	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:	642,717	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:	642,717	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	642,717	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:	24,715	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:	86,858	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:	53,209	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:	506	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:	24,715	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:	86,858	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:	53,209	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:	506	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:	144,829	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:	200,873	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:	131,727	165,508
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	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:	144,829	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:	200,873	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:	131,727	165,508
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	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	0
Interest rate lock commitments | Level 1
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0
Interest rate lock commitments | Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0
Interest rate lock commitments | Level 3
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	505
Interest rate lock commitments | Measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	505
Interest rate lock commitments | Measured on recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0
Interest rate lock commitments | Measured on recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0
Interest rate lock commitments | Measured on recurring basis | Level 3
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	505
Forward commitments | Level 1
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0
Forward commitments | Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	215
Forward commitments | Level 3
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0
Forward commitments | Measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	215
Forward commitments | Measured on recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0
Forward commitments | Measured on recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	215
Forward commitments | Measured on recurring basis | Level 3
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0
Interest rate swaps | Level 1
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0	0
Interest rate swaps | Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	26,181	6,445
Interest rate swaps | Level 3
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0	0
Interest rate swaps | Measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	26,181
Interest rate swaps		6,445
Interest rate swaps | Measured on recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	0
Interest rate swaps		0
Interest rate swaps | Measured on recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	26,181
Interest rate swaps		6,445
Interest rate swaps | Measured on recurring basis | Level 3
Assets and liabilities measured at fair value on a recurring basis
Derivative assets	$ 0
Interest rate swaps		$ 0

Disclosures About Fair Value _5

Disclosures About Fair Value of Financial Instruments - Reconciliation of all Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Beginning balance	$ 0	$ 0	$ 0	$ 0
Total net realized investment gains/ (losses) and net change in unrealized appreciation/ (depreciation):
Included in earnings	0	0	0	0
Purchases	505	0	505	0
Sales	0	0	0	0
Transfers from Level 3	0	0	0	0
Transfers into Level 3	0	0	0	0
Ending balance	$ 505	$ 0	$ 505	$ 0

Disclosures About Fair Value _6

Disclosures About Fair Value of Financial Instruments - Nonrecurring Assets that had Fair Market Values Below the Carrying Amount (Details) - USD ($) $ in Thousands	Sep. 30, 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	134,671	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	853,456	830,341
Level 3
Fair value measurement for nonrecurring assets that had a fair market value below the carrying amount
Loans measured for impairment	8,693,690	7,845,313
Total financial assets	8,703,054	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	1,237	2,498
Total financial assets	41,840	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	1,237	2,498
Total financial assets	41,840	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	40,603	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	$ 40,603	$ 40,333

Disclosures About Fair Value _7

Disclosures About Fair Value of Financial Instruments - Additional Quantitative Information, Assets Measured at Fair Value, Recurring and Nonrecurring Basis, Level 3 Input (Details) $ in Thousands	Sep. 30, 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	0.110
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	$ 1,237	$ 2,498
Loans measured for impairment | Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans measured for impairment	$ 40,603	$ 40,333

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details)	Sep. 30, 2019USD ($)
Cash Flow Hedging | Interest rate swaps
Derivative [Line Items]
Derivative notional amount	$ 50,000,000

Derivative Financial Instrume_4

Derivative Financial Instruments - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Asset derivatives, notional amount	$ 350,324	$ 221,919
Derivative assets, fair value	26,901	6,445
Liability derivatives, notional amount	317,086	221,919
Liability derivatives, fair value	26,257	6,445
Not Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Asset derivatives, notional amount	317,086	221,919
Derivative assets, fair value	26,181	6,445
Liability derivatives, notional amount	317,086	221,919
Liability derivatives, fair value	26,257	$ 6,445
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative [Line Items]
Asset derivatives, notional amount	25,331
Derivative assets, fair value	505
Liability derivatives, notional amount	0
Liability derivatives, fair value	0
Not Designated as Hedging Instrument | Forward commitments
Derivative [Line Items]
Asset derivatives, notional amount	7,907
Derivative assets, fair value	215
Liability derivatives, notional amount	0
Liability derivatives, fair value	$ 0

Derivative Financial Instrume_5

Derivative Financial Instruments - Gain (Loss) on Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Hedging derivatives:
Increase in interest expense	$ 0		$ 0
Increase in interest expense		$ 257		$ 857
Other Income
Non-hedging swap derivatives:
Decrease in other income	(125)	0	(195)	(288)
Mortgage Banking Income
Non-hedging swap derivatives:
Decrease in other income	$ 720	$ 0	$ 720	$ 0

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Changes in accumulated other comprehensive income by component
Balance beginning of the period	$ 1,333,588	$ 1,228,880	$ 1,257,638	$ 1,207,724
Reclassification due to adoption of ASU No. 2018-02				(6,746)
Other comprehensive income before reclassification adjustments (1)	1,315	(1,778)	11,376	(6,403)
Amounts reclassified from accumulted other comprehensive income	207	182	623	540
Other comprehensive income/(loss)	1,522	(1,596)	11,999	(5,863)
Balance end of the period	1,351,770	1,240,676	1,351,770	1,240,676
Unrealized holding gains (losses), tax	(525)	788	(4,549)	2,869
Realized gain on securities (gain on sales of investments, net)	1	61	1	192
Reclassification adjustment for gains included in net income, tax	0	17	1	54
Reclassification adjustment for prior period service costs included in net income, net of tax	(581)	581	(1,742)	1,742
Reclassification adjustment for defined benefit plan loss included in net income, net of tax	890	(897)	2,669	(2,691)
Reclassification adjustment for prior period service costs included in net income, tax	(83)	(90)	(250)	(271)
Change in fair value of interest rate swaps, tax		(51)		(204)
Unrealized gains and (losses) on securities available- for-sale
Changes in accumulated other comprehensive income by component
Balance beginning of the period	3,227	(10,693)	(6,832)	(4,409)
Reclassification due to adoption of ASU No. 2018-02				(991)
Other comprehensive income before reclassification adjustments (1)	1,315	(1,970)	11,376	(7,169)
Amounts reclassified from accumulted other comprehensive income	(1)	(44)	(3)	(138)
Other comprehensive income/(loss)	1,314	(2,014)	11,373	(7,307)
Balance end of the period	4,541	(12,707)	4,541	(12,707)
Change in fair value of interest rate swaps
Changes in accumulated other comprehensive income by component
Balance beginning of the period	0		0
Other comprehensive income before reclassification adjustments (1)	0		0
Amounts reclassified from accumulted other comprehensive income	0		0
Other comprehensive income/(loss)	0		0
Balance end of the period	0		0
Change in fair value of interest rate swaps
Changes in accumulated other comprehensive income by component
Balance beginning of the period		(266)		(691)
Reclassification due to adoption of ASU No. 2018-02				(149)
Other comprehensive income before reclassification adjustments (1)		192		766
Amounts reclassified from accumulted other comprehensive income		0		0
Other comprehensive income/(loss)		192		766
Balance end of the period		(74)		(74)
Change in defined benefit pension plans
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(32,446)	(32,134)	(32,864)	(26,980)
Reclassification due to adoption of ASU No. 2018-02				(5,606)
Other comprehensive income before reclassification adjustments (1)	0	0	0	0
Amounts reclassified from accumulted other comprehensive income	208	226	626	678
Other comprehensive income/(loss)	208	226	626	678
Balance end of the period	(32,238)	(31,908)	(32,238)	(31,908)
Total
Changes in accumulated other comprehensive income by component
Balance beginning of the period	(29,219)	(43,093)	(39,696)	(32,080)
Reclassification due to adoption of ASU No. 2018-02				(6,746)
Other comprehensive income/(loss)	1,522	(1,596)	11,999	(5,863)
Balance end of the period	$ (27,697)	$ (44,689)	$ (27,697)	$ (44,689)

Subsequent events - Narrative

Subsequent events - Narrative (Details) - Mutual First Financial, Inc. - USD ($) $ / shares in Units, $ in Millions	Oct. 23, 2019	Sep. 30, 2019
Subsequent Event [Line Items]
Acquisition pro forma assets		$ 2,074
Acquisition pro forma net income		$ 17.1
Subsequent Event
Subsequent Event [Line Items]
Entity shares issued per acquiree share (in shares)	2.4
Value of stock issued for purchase	$ 346
Value of stock issued (in dollars per share)	$ 39.89
Stock price measurement period	15 days

Uncategorized Items - a2019-09x

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (1,226,000)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (1,226,000)