Columbia Financial (CLBK) 10-Q 11 May 20 2020 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2020	May 08, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-38456
Entity Registrant Name	Columbia Financial, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-3504946
Entity Address, Address Line One	19-01 Route 208 North,
Entity Address, City or Town	Fair Lawn,
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07140
City Area Code	800
Local Phone Number	522-4167
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	CLBK
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 Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		115,067,114
Entity Central Index Key	0001723596
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period	Q1
Amendment Flag	false

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 88,197	$ 75,420
Short-term investments	127	127
Total cash and cash equivalents	88,324	75,547
Debt securities available for sale, at fair value	1,116,417	1,098,336
Debt securities held to maturity, at amortized cost (fair value of $286,571 and $289,505 at March 31, 2020 and December 31, 2019, respectively)	273,152	285,756
Equity securities, at fair value	2,271	2,855
Federal Home Loan Bank stock	68,233	69,579
Loans receivable	6,252,505	6,197,566
Less: allowance for loan losses	71,200	61,709
Loans receivable, net	6,181,305	6,135,857
Accrued interest receivable	22,770	22,092
Office properties and equipment, net	72,385	72,967
Bank-owned life insurance	212,832	211,415
Goodwill and intangible assets	68,279	68,582
Other assets	219,083	145,708
Total assets	8,325,051	8,188,694
Liabilities:
Deposits	5,772,418	5,645,842
Borrowings	1,376,941	1,407,022
Advance payments by borrowers for taxes and insurance	36,768	35,507
Accrued expenses and other liabilities	177,798	117,806
Total liabilities	7,363,925	7,206,177
Stockholders' equity:
Preferred stock, $0.01 par value. 10,000,000 shares authorized; none issued and outstanding at March 31, 2020 and December 31, 2019	0	0
Common stock, $0.01 par value. 500,000,000 shares authorized; 117,278,745 shares issued and 111,207,380 shares outstanding at March 31, 2020, and 113,765,387 shares issued and outstanding at December 31, 2019	1,173	1,173
Additional paid-in capital	534,213	531,667
Retained earnings	622,246	615,481
Accumulated other comprehensive loss	(59,665)	(68,735)
Treasury stock, at cost; 6,071,365 shares at March 31, 2020 and 3,513,358 shares at December 31, 2019	(95,326)	(54,950)
Common stock held by the Employee Stock Ownership Plan	(40,999)	(41,564)
Stock held by Rabbi Trust	(1,728)	(1,520)
Deferred compensation obligations	1,212	965
Total stockholders' equity	961,126	982,517
Total liabilities and stockholders' equity	$ 8,325,051	$ 8,188,694

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Debt securities held to maturity	$ 286,571	$ 289,505
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, shares issued (in shares)	117,278,745	113,765,387
Common stock, shares outstanding (in shares)	111,207,380	113,765,387
Treasury stock, shares (in shares)	6,071,365	3,513,358

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income:
Loans receivable	$ 64,018	$ 52,260
Debt securities available for sale and equity securities	7,328	7,659
Debt securities held to maturity	2,065	1,907
Federal funds and interest earning deposits	189	89
Federal Home Loan Bank stock dividends	1,090	972
Total interest income	74,690	62,887
Interest expense:
Deposits	16,832	13,679
Borrowings	7,156	6,824
Total interest expense	23,988	20,503
Net interest income	50,702	42,384
Provision for loan losses	9,568	436
Net interest income after provision for loan losses	41,134	41,948
Non-interest income:
Bank-owned life insurance	1,417	1,320
Loan fees and service charges	728	820
Gain on securities transactions	370	126
Change in fair value of equity securities	(584)	176
Gain on sale of loans	754	132
Other non-interest income	1,176	1,463
Total non-interest income	6,391	6,037
Non-interest expense:
Compensation and employee benefits	24,465	19,580
Occupancy	4,795	3,831
Federal deposit insurance premiums	110	425
Advertising	1,144	1,388
Professional fees	1,366	1,247
Data processing	765	638
Merger-related expenses	1,075	0
Other non-interest expense	4,788	2,450
Total non-interest expense	38,508	29,559
Income before income tax expense	9,017	18,426
Income tax expense	2,252	3,507
Net income	$ 6,765	$ 14,919
Earnings per share - basic and diluted (in dollars per share)	$ 0.06	$ 0.13
Weighted average shares outstanding - basic and diluted (in shares)	108,438,173	111,536,577
Demand deposit account fees
Non-interest income:
Revenue from contract with customer	$ 1,299	$ 959
Title insurance fees
Non-interest income:
Revenue from contract with customer	$ 1,231	$ 1,041

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 6,765	$ 14,919
Other comprehensive income, net of tax:
Unrealized gains on debt securities available for sale	19,267	9,295
Accretion of unrealized gain on debt securities reclassified as held to maturity	6	10
Reclassification adjustment for gains included in net income	289	100
Total other comprehensive (loss) income, net of tax	19,562	9,405
Derivatives, net of tax:
Unrealized (loss) on swap contracts accounted for as cash flow hedges	(11,349)	(2,780)
Total derivative, net of tax	(11,349)	(2,780)
Employee benefit plans, net of tax:
Amortization of prior service cost included in net income	33	(25)
Reclassification adjustment of actuarial net gain included in net income	2,084	130
Change in funded status of retirement obligations	(1,260)	(105)
Total employee benefit plans, net of tax	857	0
Total other comprehensive income	9,070	6,625
Total comprehensive income, net of tax	$ 15,835	$ 21,544

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholder's Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in-Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)	Treasury Stock	Common Stock Held by the Employee Stock Ownership Plan	Stock Held by Rabbi Trust	Deferred Compensation Obligations
Balance at beginning of period at Dec. 31, 2018	$ 972,060	$ 1,159	$ 527,037	$ 560,216	$ (71,897)	$ 0	$ (43,835)	$ (1,259)	$ 639
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,919			14,919
Other comprehensive income (loss)	6,625				6,625
Employee Stock Ownership Plan shares committed to be released	868		309				559
Funding of deferred compensation obligations	30							(100)	130
Balance at end of year at Mar. 31, 2019	994,502	1,159	527,346	575,683	(65,820)	0	(43,276)	(1,359)	769
Balance at beginning of period at Dec. 31, 2019	982,517	1,173	531,667	615,481	(68,735)	(54,950)	(41,564)	(1,520)	965
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,765			6,765
Other comprehensive income (loss)	9,070				9,070
Stock based compensation	2,204		2,204
Purchase of treasury stock (2,557,126 shares)	(40,363)					(40,363)
Restricted stock forfeitures (881 shares)	(13)					(13)
Employee Stock Ownership Plan shares committed to be released	907		342				565
Funding of deferred compensation obligations	39							(208)	247
Balance at end of year at Mar. 31, 2020	$ 961,126	$ 1,173	$ 534,213	$ 622,246	$ (59,665)	$ (95,326)	$ (40,999)	$ (1,728)	$ 1,212

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholder's Equity (Unaudited) Consolidated Statements of Changes in Stockholder's Equity (Unaudited) (Parenthetical)	3 Months Ended
	Mar. 31, 2020shares
Statement of Stockholders' Equity [Abstract]
Treasury stock, shares purchased (in shares)	2,557,126
Restricted stock, shares forfeited (in shares)	881

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 6,765,000	$ 14,919,000
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred loan costs, fees and purchased premiums and discounts	824,000	314,000
Net amortization of premiums and discounts on securities	352,000	309,000
Net amortization of mortgage servicing rights	28,000	(21,000)
Amortization of intangible assets	241,000	0
Depreciation and amortization of office properties and equipment	1,615,000	1,057,000
Provision for loan losses	9,568,000	436,000
Gain on securities transactions	(370,000)	(126,000)
Change in fair value of equity securities	584,000	(176,000)
Proceeds from sales of loans held-for-sale	51,621,000	8,081,000
Gain on sale of loans	(754,000)	(132,000)
Loss on real estate owned	0	1,000
Loss on disposal of office properties and equipment	670,000	0
Loss on write-down of mortgage servicing rights	34,000	0
Deferred tax expense	7,527,000	148,000
Increase in accrued interest receivable	(678,000)	(1,198,000)
(Increase) decrease in other assets	(82,522,000)	6,197,000
Increase (decrease) in accrued expenses and other liabilities	45,929,000	(3,553,000)
Income on bank-owned life insurance	(1,417,000)	(1,320,000)
Employee stock ownership plan expense	907,000	868,000
Stock based compensation	2,204,000	0
Increase in deferred compensation obligations under Rabbi Trust	39,000	30,000
Net cash provided by operating activities	43,167,000	25,834,000
Cash flows from investing activities:
Proceeds from sales of debt securities available for sale	20,761,000	0
Proceeds from sales of equity securities	0	764,000
Proceeds from paydowns/maturities/calls of debt securities available for sale	36,571,000	25,942,000
Proceeds from paydowns/maturities/calls of debt securities held to maturity	12,506,000	2,925,000
Purchases of debt securities available for sale	(50,544,000)	(65,487,000)
Purchases of debt securities held to maturity	0	(28,426,000)
Proceeds from sales of loans receivable	15,555,000	9,311,000
Purchase of loans receivable	0	(2,313,000)
Net increase in loans receivable	(122,262,000)	(45,415,000)
Proceeds from redemptions of Federal Home Loan Bank stock	19,269,000	19,017,000
Purchases of Federal Home Loan Bank stock	(17,923,000)	(14,942,000)
Additions to office properties and equipment	(1,703,000)	(7,298,000)
Proceeds from sale of real estate owned	0	91,000
Net cash used in investing activities	(87,770,000)	(105,831,000)
Cash flows from financing activities:
Net increase in deposits	126,576,000	192,755,000
Proceeds from long-term borrowings	50,000,000	53,455,000
Payments on long-term borrowings	(56,100,000)	(60,000,000)
Net decrease in short-term borrowings	(23,981,000)	(84,000,000)
Increase in advance payments by borrowers for taxes and insurance	1,261,000	727,000
Purchase of treasury stock	(40,363,000)	0
Restricted stock forfeitures	(13,000)	0
Net cash provided by financing activities	57,380,000	102,937,000
Net increase in cash and cash equivalents	12,777,000	22,940,000
Cash and cash equivalents at beginning of year	75,547,000	42,201,000
Cash and cash equivalents at end of period	88,324,000	65,141,000
Cash paid during the period for:
Interest on deposits and borrowings	23,197,000	20,272,000
Income tax payments	0	100,000
Non-cash investing and financing activities:
Transfer of loans receivable to loans held-for-sale	50,949,000	0
Securitization of loans	$ 0	$ 6,061,000

Basis of Financial Statement Pr

Basis of Financial Statement Presentation	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Financial Statement Presentation	Basis of Financial Statement Presentation The accompanying unaudited consolidated financial statements include the accounts of Columbia Financial, Inc., its wholly-owned subsidiary Columbia Bank (the "Bank") and the Bank's wholly-owned subsidiaries (collectively, the “Company”). In consolidation, all intercompany accounts and transactions are eliminated. Columbia Financial, Inc. is a majority-owned subsidiary of Columbia Bank, MHC (the "MHC"). The accounts of the MHC are not consolidated in the accompanying consolidated financial statements of the Company. In preparing the interim unaudited consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the dates of the Consolidated Statements of Financial Condition and Consolidated Statements of Income for the periods presented. Actual results could differ from these estimates. Material estimates that are particularly susceptible to change are the determination of the adequacy of the allowance for credit losses, evaluation of the need for valuation allowances on deferred tax assets, and determination of liabilities related to retirement and other post-retirement benefits. These estimates and assumptions are evaluated on an ongoing basis and are adjusted when facts and circumstances dictate. The interim unaudited consolidated financial statements reflect all normal and recurring adjustments, which are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. The results of operations for the three month period ended March 31, 2020 are not necessarily indicative of the results of operations that may be expected for the entire fiscal year or any other period. Certain reclassifications have been made in the consolidated financial statements to conform with current year classifications. The interim unaudited consolidated financial statements of the Company presented herein have been prepared in accordance with the rules of the Securities and Exchange Commission (“SEC”) for quarterly reports on Form 10-Q and U.S. generally accepted accounting principles (“GAAP”). Certain information and note disclosures have been condensed or omitted pursuant to the rules and regulations of the SEC. These unaudited consolidated financial statements should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2019

Acquisition of Stewardship Fina

Acquisition of Stewardship Financial Corporation	3 Months Ended
	Mar. 31, 2020
Business Combinations [Abstract]
Acquisition of Stewardship Financial Corporation	Acquisition of Stewardship Financial Corporation On November 1, 2019, the Company completed its acquisition of Stewardship Financial Corporation ("Stewardship"), pursuant to the Agreement and Plan of Merger, dated as of June 6, 2019 (the "Merger Agreement"), by and among Columbia Financial, Broadway Acquisition Corp. (a wholly owned subsidiary of Columbia Financial) and Stewardship. Under the terms of the merger agreement, each outstanding share of Stewardship common stock was converted into the right to received $15.75 in cash at the effective time of the merger. At the time of closing, Stewardship had $956.0 million in total assets, including $756.9 million in net loans receivable, $52.6 million in securities, and $877.8 million in total liabilities, including $781.4 million in deposits and $81.8 million in borrowings. The deposits initially acquired from Stewardship were held across a network of 12 branches located in New Jersey throughout Bergen, Morris, and Passaic counties. During the three months ended March 31, 2020, four of these branches were closed, and the Bank recorded a loss of $770,000 related to these branch closures. Merger-related expenses are recorded in the Consolidated Statements of Income and are expensed as incurred. Direct acquisition and other charges incurred in connection with the Stewardship acquisition totaled $962,000 for the three months ended March 31, 2020. There were no merger expenses recorded for the three months ended March 31, 2019. On April 1, 2020, the Company completed its previously announced acquisition of RSB Bancorp, MHC, RSB Bancorp, Inc. and Roselle Bank (collectively, the "Roselle Entities"). Under the terms of the Merger Agreement, RSB Bancorp, MHC merged with and into Columbia Bank MHC, (the "MHC"), with the MHC as the surviving entity, RSB Bancorp, Inc. merged with and into the Company, with the Company as the surviving entity; and Roselle Bank merged with and into the Bank, with the Bank as the surviving institution. Under the terms of the merger agreement, effective April 1, 2020, depositors of Roselle Bank became depositors of the Bank and have the same rights and privileges in the MHC as if their accounts had been established at the Bank on the date established at Roselle Bank. At the effective time of the merger, the Company issued 4,759,048 shares of its common stock to the MHC, representing an amount equal to the fair value of the Roselle Entities as determined by an independent appraiser. 18. Acquisition of Roselle Entities (continued) Merger-related expenses which are recorded in the Consolidated Statements of Income and include costs relating to the Company's acquisition of the Roselle Entities represent one-time costs associated with acquisition activities and do not represent ongoing costs of the fully integrated combined organization. Accounting guidance requires that acquisition-related transactional and restructuring costs incurred by the Company be charged to expense as incurred. Direct acquisition and other charges incurred in connection with the Roselle acquisition totaled $112,000 for the three months ended March 31, 2020. Based on the closing date of April 1, 2020, the Company's unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q do not reflect the changes attributable to the Company's acquisition of the Roselle Entities.

Earnings per Share

Earnings per Share	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Earnings Per Share	Earnings per Share Basic earnings per share ("EPS") is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. For purposes of calculating basic EPS, weighted average common shares outstanding excludes treasury stock, unallocated employee stock ownership plan shares that have not been committed for release and deferred compensation obligations required to be settled in shares of Company stock. Diluted EPS is computed using the same method as basic EPS and reflects the potential dilution which could occur if stock options and unvested shares were exercised and converted into common stock. The potentially diluted shares would then be included in the weighted average number of shares outstanding for the period using the treasury stock method. 3. Earnings per Share (continued) The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share calculations for the three months ended March 31, 2020 and 2019 : For the Three Months Ended March 31, 2020 2019 (Dollars in thousands, except per share data) Net income $ 6,765 $ 14,919 Shares: Weighted average shares outstanding - basic 108,438,173 111,536,577 Weighted average dilutive shares outstanding — — Weighted average shares outstanding - diluted 108,438,173 111,536,577 Earnings per share: Basic $ 0.06 $ 0.13 Diluted $ 0.06 $ 0.13 For the three months ended March 31, 2020 the average number of stock options which were anti-dilutive and were not included in the computation of diluted earnings per share totaled 811,853 . There were no stock options outstanding for the three months ended March 31, 2019 .

Stock Repurchase Program

Stock Repurchase Program	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Stock Repurchase Program	Stock Repurchase Program On June 11, 2019, the Company announced that its Board of Directors authorized the Company's first stock repurchase program since the completion of its minority public offering in April 2018. This program, which commenced on June 13, 2019, authorized the purchase of up to 4,000,000 shares, or approximately 3.5% , of the Company's then issued and outstanding common stock. On December 5, 2019, the Company announced that its Board of Directors had expanded its stock repurchase program to authorize the purchase of an additional 3,000,000 shares of the Company's outstanding common stock in addition to the shares remaining under the repurchase program announced on June 11, 2019. During the three months ended March 31, 2020 , the Company repurchased 2,557,126 shares at a cost of approximately $40.4 million , or $15.78 per share under this program. There were no

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2020
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Accounting Pronouncements Adopted in 2020 In October 2018, the FASB issued ASU No. 2018-16, Derivatives and Hedging (Topic 815)- Inclusion of the Secured Overnight Financing Rate ("SOFR") Overnight Index Swap ("OIS") Rate as a Benchmark Interest Rate for Hedge Accounting Purposes. This ASU permits the use of the OIS rate based upon SOFR as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815 in addition to the direct Treasury obligations of the U.S. Government, the LIBOR swap rate, the OIS rate based on the Fed Funds Effective Rate, and the Securities Industry and Financial Markets Association Municipal Swap Rate. The amendments in this ASU are required to be adopted concurrently with the amendments in ASU No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities, which was issued in August 2017. The effective date for this ASU for the Company is for fiscal years beginning after December 15, 2019, with early adoption, including adoption in an interim period permitted. The amendments should be adopted on a prospective basis for qualifying new of redesignated hedging relationships entered into on or after date of adoption. The Company adopted this guidance effective January 1, 2020. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements. 5. Summary of Significant Accounting Policies (continued) Accounting Pronouncements Adopted in 2020 (continued) In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement. The purpose of this updated guidance is to improve the effectiveness and disclosures in the notes to the financial statements . The ASU removes the requirement to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; removes the policy for timing of transfers between levels; and removes the disclosure related to the valuation process for Level 3 fair value measurements. The ASU also modifies existing disclosure requirements which relate to the disclosure for investments in certain entities which calculate net asset value and clarifies the disclosure about uncertainty in the measurements as of the reporting date. For all entities, the effective date for this guidance is fiscal years beginning after December 15, 2019, including interim periods within the reporting period, with early adoption permitted. Entities are also allowed to elect early adoption of the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. The Company adopted this guidance effective January 1, 2020. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. This guidance shortens the amortization period for premiums on callable debt securities by requiring that premiums be amortized to the first (or earliest) call date instead of as an adjustment to the yield over the contractual life. This change more closely aligns the accounting with the economics of a callable debt security and the amortization period with expectations that already are included in market pricing on callable debt securities. This guidance does not change the accounting for discounts on callable debt securities, which will continue to be amortized to the maturity date. This guidance includes only instruments that are held at a premium and have explicit call features. It does not include instruments that contain prepayment features, such as mortgage backed securities; nor does it include call options that are contingent upon future events or in which the timing or amount to be paid is not fixed. The effective date for this ASU for the Company is fiscal years beginning after December 15, 2019, including interim periods within the reporting period, with early adoption permitted. Transition is on a modified retrospective basis with an adjustment to retained earnings as of the beginning of the period of adoption. The Company adopted this guidance effective January 1, 2020. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The main objective of this guidance is to simplify the accounting for goodwill impairment by requiring that impairment charges be based upon the first step in the current two-step impairment test under ASC 350. Currently, if the fair value of a reporting unit is lower than its carrying amount (Step 1), an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount (Step 2). The implied fair value of goodwill is calculated by deducting the fair value of all assets and liabilities of the reporting unit from the reporting unit’s fair value as determined in Step 1. To determine the implied fair value of goodwill, entities estimate the fair value of any unrecognized intangible assets and any corporate-level assets or liabilities that were included in the determination of the carrying amount and fair value of the reporting unit in Step 1. Under this guidance, if a reporting unit’s carrying amount exceeds its fair value, an entity will record an impairment charge based on that difference. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. This guidance eliminates the requirement to calculate a goodwill impairment charge using Step 2. This guidance does not change the guidance on completing Step 1 of the goodwill impairment test. Under this guidance, an entity will still be able to perform the current optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The guidance in the ASU was applied prospectively and is effective for the Company for annual and interim impairment tests performed in periods beginning after December 15, 2019. The Company adopted this guidance effective January 1, 2020. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This guidance requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of the future minimum lease payments, at the lease commencement date for leases classified as operating leases as well as finance leases. The update also requires new quantitative disclosures related to leases in the Company's consolidated financial statements. There are also practical expedients in this update related to leases that commenced before the effective date, initial direct costs and the use of hindsight to extend or terminate a lease or purchase a leased asset. Lessor accounting remains largely unchanged under this new guidance. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842)-Land Easement Practical Expedient for Transition to Topic 842 , which provides an optional practical expedient to not evaluate land easements which were existing or expired before the adoption of Topic 842 that were not accounted for as leases under Topic 840. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases and ASU 2018-11, Leases (Topic 842) -Targeted Improvements which provides entities with an optional transition method under which comparative periods presented in the financial statements will continue to be in accordance with current Topic 840, Leases, and a practical expedient to not separate non-lease components from the associated lease component. The guidance is effective for the Company for annual periods beginning after 5. Summary of Significant Accounting Policies (continued) Accounting Pronouncements Adopted in 2020 (continued) December 15, 2019, including interim periods within that reporting period. In the evaluation of this guidance, the Company identified the inventory of leases and actively accumulated the requisite lease data necessary to apply the guidance. The Company selected a software platform to support the recording, accounting and disclosure requirements of the new lease guidance. Upon adoption, the Company recorded a right-of-use asset and lease liability as of January 1, 2020. See note 10 for more information regarding adoption. Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, Financial Instruments- Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("CECL") , further amended by ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments . Topic 326 pertains to the measurement of credit losses on financial instruments. This update requires the measurement of all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better determine their credit loss estimates. This update is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. This update is effective for financial statements issued for fiscal years and interim periods beginning after December 15, 2019. The Company elected to defer the adoption of the CECL methodology permitted by the recently enacted Coronavirus Aid, Relief and Economic Security Act ("CARES Act"). The Company will adopt CECL at the earlier of December 31, 2020 or when the national emergency concerning the COVID-19 outbreak has concluded. The Company will adopt the above mentioned ASUs related to Financial Instruments -Credit Losses (Topic 326) using a modified retrospective approach. Our CECL methodology includes the following key factors and assumptions for all loan portfolio segments: • a historical loss period, which represents a full economic credit cycle utilizing internal loss experience, as well as industry and peer historical loss data; • a single economic scenario with a reasonable and supportable forecast period of four to six quarters based on management’s current review of macroeconomic factors and the reliability of extended economic forecasts over different time horizons; • a reversion to historical mean period (after the reasonable and supportable forecast period) using a straight-line approach that extends through the shorter of six quarters or the end of the remaining contractual term; and • expected prepayment rates based on a combination of our historical experience and market observations. Based on several analyses performed, as well as an implementation analysis utilizing existing exposures and forecasts of macroeconomic conditions at March 31, 2020, we currently expect the adoption of ASU 2016-13 will result in an increase between 10% and 20% in our allowance for loan losses and our reserves for unfunded commitments. As part of the implementation of the ASU, the Company will reconcile historical loan data, determine segmentation of the loan portfolio for application of the CECL calculation, determine the key assumptions, select calculation methods, and establish an internal control framework. We are currently finalizing the execution of our implementation controls and enhancing process documentation. The expected increase in the allowance for loan losses and reserve for unfunded commitments is a result of the change from an incurred loss model, which encompasses allowances for current known and inherent losses within the portfolio, to an expected loss model, which encompasses allowances for losses expected to be incurred over the life of the portfolio. Furthermore, ASU 2016-13 will necessitate that we establish an allowance for expected credit losses for certain debt securities and other financial assets; however, we do not expect these allowances to be significant. Future amounts of provision expense related to our allowance for loan losses and reserves for unfunded commitments will depend on the size and composition of our loan portfolio, future economic conditions and borrowers’ payment performance. Future amounts of provision related our debt securities will depend on the composition of our securities portfolio and current market conditions. The adoption of ASU 2016-13 is not expected to have a significant impact on our regulatory capital ratios. Upon adoption, any impact to the allowance for credit losses, currently the allowance for loan losses, will have an offsetting impact on retained earnings. 5. Summary of Significant Accounting Policies (continued) Accounting Pronouncements Not Yet Adopted 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.

Debt Securities Available for S

Debt Securities Available for Sale	3 Months Ended
	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Debt Securities Available for Sale	Debt Securities Available for Sale D ebt securities available for sale at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 40,930 $ 1,283 $ — $ 42,213 Mortgage-backed securities and collateralized mortgage obligations 963,977 38,878 (817 ) 1,002,038 Municipal obligations 956 3 — 959 Corporate debt securities 68,606 563 (2,044 ) 67,125 Trust preferred securities 5,000 — (918 ) 4,082 $ 1,079,469 $ 40,727 $ (3,779 ) $ 1,116,417 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 42,081 $ 321 $ (16 ) $ 42,386 Mortgage-backed securities and collateralized mortgage obligations 968,165 12,981 (1,265 ) 979,881 Municipal obligations 2,284 1 (1 ) 2,284 Corporate debt securities 68,613 945 (378 ) 69,180 Trust preferred securities 5,000 — (395 ) 4,605 $ 1,086,143 $ 14,248 $ (2,055 ) $ 1,098,336 6. Debt Securities Available for Sale (continued) The amortized cost and fair value of debt securities available for sale at March 31, 2020 , by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer. March 31, 2020 Amortized Cost Fair Value (In thousands) One year or less $ 31,476 $ 31,584 More than one year to five years 25,971 26,773 More than five years to ten years 52,572 51,555 More than ten years 5,473 4,467 $ 115,492 $ 114,379 Mortgage-backed securities and collateralized mortgage obligations 963,977 1,002,038 $ 1,079,469 $ 1,116,417 Mortgage-backed securities and collateralized mortgage obligations totaling $964.0 million at amortized cost, and $1.0 billion at fair value, are not classified by maturity in the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. During the three months ended March 31, 2020 , proceeds from the sale of debt securities available for sale totaled $20.8 million , resulting in $369,000 of gross gains and no gross losses. Proceeds from called debt securities available for sale totaled $1.1 million , resulting in $1,000 of gross gains and no gross losses. Proceeds from matured debt securities available for sale totaled $635,000 . During the three months ended March 31, 2019 , there were no sales or calls of debt securities available for sale. Proceeds from one called debt security available for sale totaled $797,000 . No gross gains or losses were recognized on the security which was called. Debt securities available for sale having a carrying value of $649.4 million and $462.0 million , respectively, at March 31, 2020 and December 31, 2019 , respectively, were pledged as security for public funds on deposit at the Bank as required and permitted by law, pledged for outstanding borrowings at the Federal Home Loan Bank, and pledged for potential borrowings at the Federal Reserve Bank of New York. The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2020 and December 31, 2019 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2020 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ — $ — $ — $ — $ — $ — Mortgage-backed securities and collateralized mortgage obligations 50,819 (458 ) 41,392 (359 ) 92,211 (817 ) Municipal obligations — — — — — — Corporate debt securities 26,552 (1,036 ) 3,993 (1,008 ) 30,545 (2,044 ) Trust preferred securities — — 4,081 (918 ) 4,081 (918 ) $ 77,371 $ (1,494 ) $ 49,466 $ (2,285 ) $ 126,837 $ (3,779 ) 6. Debt Securities Available for Sale (continued) December 31, 2019 Less Than 12 Months 12 Months or Longer Total Fair Value — Gross Unrealized (Losses) — Fair Value — Gross Unrealized (Losses) — Fair Value — Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ 5,106 $ (13 ) $ 4,988 $ (3 ) $ 10,094 $ (16 ) Mortgage-backed securities and collateralized mortgage obligations 178,665 (946 ) 58,208 (319 ) 236,873 (1,265 ) Municipal obligations 696 (1 ) — — 696 (1 ) Corporate debt securities 2,588 (5 ) 4,627 (373 ) 7,215 (378 ) Trust preferred securities — — 4,605 (395 ) 4,605 (395 ) $ 187,055 $ (965 ) $ 72,428 $ (1,090 ) $ 259,483 $ (2,055 ) The Company evaluates securities for other-than-temporary impairment at each reporting period and more frequently when economic or market conditions warrant such evaluation. The temporary loss position associated with debt securities available for sale was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at March 31, 2020 , nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery. The number of securities in an unrealized loss position as of March 31, 2020 totaled 46 , compared with 97 at December 31, 2019 . All temporarily impaired securities were investment grade as of March 31, 2020 and December 31, 2019 . The Company did not record an other-than-temporary impairment charge on debt securities available for sale during the three months ended March 31, 2020 and 2019 . Debt securities held to maturity at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 10,000 $ 1 $ — $ 10,001 Mortgage-backed securities and collateralized mortgage obligations 263,152 13,431 (13 ) 276,570 $ 273,152 $ 13,432 $ (13 ) $ 286,571 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 20,000 $ 26 $ (66 ) $ 19,960 Mortgage-backed securities and collateralized mortgage obligations 265,756 4,048 (259 ) 269,545 $ 285,756 $ 4,074 $ (325 ) $ 289,505 The amortized cost and fair value of debt securities held to maturity at March 31, 2020 , by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer. March 31, 2020 Amortized Cost Fair Value (In thousands) More than ten years 10,000 10,001 10,000 10,001 Mortgage-backed securities and collateralized mortgage obligations 263,152 276,570 $ 273,152 $ 286,571 Mortgage-backed securities and collateralized mortgage obligations totaling $263.2 million at amortized cost, and $276.6 million at fair value, are not classified by maturity in the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. During the three months ended March 31, 2020 , there were no sales or maturities of debt securities held to maturity. Proceeds from the call of one debt security held to maturity totaled $10.0 million , resulting in no gross gains and no gross losses. During the three months ended March 31, 2019 , there were no sales, calls or maturities of debt securities held for maturity. Debt securities held to maturity having a carrying value of $239.2 million and $236.0 million , at March 31, 2020 and December 31, 2019 , respectively, were pledged as security for public funds on deposit at the Bank as required and permitted by law, pledged for outstanding borrowings at the Federal Home Loan Bank, and pledged for potential borrowings at the Federal Reserve Bank of New York. 7. Debt Securities Held to Maturity (continued) The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2020 and December 31, 2019 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2020 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) Mortgage-backed securities and collateralized mortgage obligations 1,908 (13 ) — — 1,908 (13 ) $ 1,908 $ (13 ) $ — $ — $ 1,908 $ (13 ) December 31, 2019 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ 9,934 $ (66 ) $ — $ — $ 9,934 $ (66 ) Mortgage-backed securities and collateralized mortgage obligations 27,911 (251 ) 772 (8 ) 28,683 (259 ) $ 37,845 $ (317 ) $ 772 $ (8 ) $ 38,617 $ (325 ) The Company evaluates securities for other-than-temporary impairment at each reporting period and more frequently when economic or market conditions warrant such evaluation. The temporary loss position associated with debt securities held to maturity was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at March 31, 2020 , nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery. There was one security in an unrealized loss position as of March 31, 2020 , compared with 22 at December 31, 2019 . All temporarily impaired securities were investment grade as of March 31, 2020 and December 31, 2019 . The Company did not record an other-than-temporary impairment charge on debt securities held to maturity during the three months ended March 31, 2020 and 2019 . The Company has an equity securities portfolio which consists of stock in other financial institutions, a payment technology company, and a community bank correspondent services company, which is reported at fair value on the Company's Consolidated Statements of Financial Condition. The fair value of the equities portfolio at March 31, 2020 and December 31, 2019 was $2.3 million and $2.9 million , respectively. The Company adopted ASU 2016-01 on January 1, 2019, resulting in a $548,000 after tax cumulative-effect adjustment from other comprehensive income (loss) to retained earnings, as reflected in the Consolidated Statements of Changes in Stockholders' Equity. The Company recorded a net (decrease)/increase in the fair value of equity securities of $(584,000) and $176,000 , during the three months ended March 31, 2020 and 2019 , as a component of non-interest income. 8. Equity Securities at Fair Value (continued) During the three months ended March 31, 2020 , there were no sales of equity securities. During the three months ended March 31, 2019 , proceeds from sales of equity securities totaled $764,000 , resulting in gross gains of $126,000 and no

Debt Securities Held to Maturit

Debt Securities Held to Maturity	3 Months Ended
	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Debt Securities Held to Maturity	Debt Securities Available for Sale D ebt securities available for sale at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 40,930 $ 1,283 $ — $ 42,213 Mortgage-backed securities and collateralized mortgage obligations 963,977 38,878 (817 ) 1,002,038 Municipal obligations 956 3 — 959 Corporate debt securities 68,606 563 (2,044 ) 67,125 Trust preferred securities 5,000 — (918 ) 4,082 $ 1,079,469 $ 40,727 $ (3,779 ) $ 1,116,417 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 42,081 $ 321 $ (16 ) $ 42,386 Mortgage-backed securities and collateralized mortgage obligations 968,165 12,981 (1,265 ) 979,881 Municipal obligations 2,284 1 (1 ) 2,284 Corporate debt securities 68,613 945 (378 ) 69,180 Trust preferred securities 5,000 — (395 ) 4,605 $ 1,086,143 $ 14,248 $ (2,055 ) $ 1,098,336 6. Debt Securities Available for Sale (continued) The amortized cost and fair value of debt securities available for sale at March 31, 2020 , by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer. March 31, 2020 Amortized Cost Fair Value (In thousands) One year or less $ 31,476 $ 31,584 More than one year to five years 25,971 26,773 More than five years to ten years 52,572 51,555 More than ten years 5,473 4,467 $ 115,492 $ 114,379 Mortgage-backed securities and collateralized mortgage obligations 963,977 1,002,038 $ 1,079,469 $ 1,116,417 Mortgage-backed securities and collateralized mortgage obligations totaling $964.0 million at amortized cost, and $1.0 billion at fair value, are not classified by maturity in the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. During the three months ended March 31, 2020 , proceeds from the sale of debt securities available for sale totaled $20.8 million , resulting in $369,000 of gross gains and no gross losses. Proceeds from called debt securities available for sale totaled $1.1 million , resulting in $1,000 of gross gains and no gross losses. Proceeds from matured debt securities available for sale totaled $635,000 . During the three months ended March 31, 2019 , there were no sales or calls of debt securities available for sale. Proceeds from one called debt security available for sale totaled $797,000 . No gross gains or losses were recognized on the security which was called. Debt securities available for sale having a carrying value of $649.4 million and $462.0 million , respectively, at March 31, 2020 and December 31, 2019 , respectively, were pledged as security for public funds on deposit at the Bank as required and permitted by law, pledged for outstanding borrowings at the Federal Home Loan Bank, and pledged for potential borrowings at the Federal Reserve Bank of New York. The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2020 and December 31, 2019 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2020 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ — $ — $ — $ — $ — $ — Mortgage-backed securities and collateralized mortgage obligations 50,819 (458 ) 41,392 (359 ) 92,211 (817 ) Municipal obligations — — — — — — Corporate debt securities 26,552 (1,036 ) 3,993 (1,008 ) 30,545 (2,044 ) Trust preferred securities — — 4,081 (918 ) 4,081 (918 ) $ 77,371 $ (1,494 ) $ 49,466 $ (2,285 ) $ 126,837 $ (3,779 ) 6. Debt Securities Available for Sale (continued) December 31, 2019 Less Than 12 Months 12 Months or Longer Total Fair Value — Gross Unrealized (Losses) — Fair Value — Gross Unrealized (Losses) — Fair Value — Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ 5,106 $ (13 ) $ 4,988 $ (3 ) $ 10,094 $ (16 ) Mortgage-backed securities and collateralized mortgage obligations 178,665 (946 ) 58,208 (319 ) 236,873 (1,265 ) Municipal obligations 696 (1 ) — — 696 (1 ) Corporate debt securities 2,588 (5 ) 4,627 (373 ) 7,215 (378 ) Trust preferred securities — — 4,605 (395 ) 4,605 (395 ) $ 187,055 $ (965 ) $ 72,428 $ (1,090 ) $ 259,483 $ (2,055 ) The Company evaluates securities for other-than-temporary impairment at each reporting period and more frequently when economic or market conditions warrant such evaluation. The temporary loss position associated with debt securities available for sale was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at March 31, 2020 , nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery. The number of securities in an unrealized loss position as of March 31, 2020 totaled 46 , compared with 97 at December 31, 2019 . All temporarily impaired securities were investment grade as of March 31, 2020 and December 31, 2019 . The Company did not record an other-than-temporary impairment charge on debt securities available for sale during the three months ended March 31, 2020 and 2019 . Debt securities held to maturity at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 10,000 $ 1 $ — $ 10,001 Mortgage-backed securities and collateralized mortgage obligations 263,152 13,431 (13 ) 276,570 $ 273,152 $ 13,432 $ (13 ) $ 286,571 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 20,000 $ 26 $ (66 ) $ 19,960 Mortgage-backed securities and collateralized mortgage obligations 265,756 4,048 (259 ) 269,545 $ 285,756 $ 4,074 $ (325 ) $ 289,505 The amortized cost and fair value of debt securities held to maturity at March 31, 2020 , by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer. March 31, 2020 Amortized Cost Fair Value (In thousands) More than ten years 10,000 10,001 10,000 10,001 Mortgage-backed securities and collateralized mortgage obligations 263,152 276,570 $ 273,152 $ 286,571 Mortgage-backed securities and collateralized mortgage obligations totaling $263.2 million at amortized cost, and $276.6 million at fair value, are not classified by maturity in the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. During the three months ended March 31, 2020 , there were no sales or maturities of debt securities held to maturity. Proceeds from the call of one debt security held to maturity totaled $10.0 million , resulting in no gross gains and no gross losses. During the three months ended March 31, 2019 , there were no sales, calls or maturities of debt securities held for maturity. Debt securities held to maturity having a carrying value of $239.2 million and $236.0 million , at March 31, 2020 and December 31, 2019 , respectively, were pledged as security for public funds on deposit at the Bank as required and permitted by law, pledged for outstanding borrowings at the Federal Home Loan Bank, and pledged for potential borrowings at the Federal Reserve Bank of New York. 7. Debt Securities Held to Maturity (continued) The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2020 and December 31, 2019 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2020 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) Mortgage-backed securities and collateralized mortgage obligations 1,908 (13 ) — — 1,908 (13 ) $ 1,908 $ (13 ) $ — $ — $ 1,908 $ (13 ) December 31, 2019 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ 9,934 $ (66 ) $ — $ — $ 9,934 $ (66 ) Mortgage-backed securities and collateralized mortgage obligations 27,911 (251 ) 772 (8 ) 28,683 (259 ) $ 37,845 $ (317 ) $ 772 $ (8 ) $ 38,617 $ (325 ) The Company evaluates securities for other-than-temporary impairment at each reporting period and more frequently when economic or market conditions warrant such evaluation. The temporary loss position associated with debt securities held to maturity was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at March 31, 2020 , nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery. There was one security in an unrealized loss position as of March 31, 2020 , compared with 22 at December 31, 2019 . All temporarily impaired securities were investment grade as of March 31, 2020 and December 31, 2019 . The Company did not record an other-than-temporary impairment charge on debt securities held to maturity during the three months ended March 31, 2020 and 2019 . The Company has an equity securities portfolio which consists of stock in other financial institutions, a payment technology company, and a community bank correspondent services company, which is reported at fair value on the Company's Consolidated Statements of Financial Condition. The fair value of the equities portfolio at March 31, 2020 and December 31, 2019 was $2.3 million and $2.9 million , respectively. The Company adopted ASU 2016-01 on January 1, 2019, resulting in a $548,000 after tax cumulative-effect adjustment from other comprehensive income (loss) to retained earnings, as reflected in the Consolidated Statements of Changes in Stockholders' Equity. The Company recorded a net (decrease)/increase in the fair value of equity securities of $(584,000) and $176,000 , during the three months ended March 31, 2020 and 2019 , as a component of non-interest income. 8. Equity Securities at Fair Value (continued) During the three months ended March 31, 2020 , there were no sales of equity securities. During the three months ended March 31, 2019 , proceeds from sales of equity securities totaled $764,000 , resulting in gross gains of $126,000 and no

Equity Securities at Fair Value

Equity Securities at Fair Value	3 Months Ended
	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Equity Securities at Fair Value	Debt Securities Available for Sale D ebt securities available for sale at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 40,930 $ 1,283 $ — $ 42,213 Mortgage-backed securities and collateralized mortgage obligations 963,977 38,878 (817 ) 1,002,038 Municipal obligations 956 3 — 959 Corporate debt securities 68,606 563 (2,044 ) 67,125 Trust preferred securities 5,000 — (918 ) 4,082 $ 1,079,469 $ 40,727 $ (3,779 ) $ 1,116,417 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 42,081 $ 321 $ (16 ) $ 42,386 Mortgage-backed securities and collateralized mortgage obligations 968,165 12,981 (1,265 ) 979,881 Municipal obligations 2,284 1 (1 ) 2,284 Corporate debt securities 68,613 945 (378 ) 69,180 Trust preferred securities 5,000 — (395 ) 4,605 $ 1,086,143 $ 14,248 $ (2,055 ) $ 1,098,336 6. Debt Securities Available for Sale (continued) The amortized cost and fair value of debt securities available for sale at March 31, 2020 , by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer. March 31, 2020 Amortized Cost Fair Value (In thousands) One year or less $ 31,476 $ 31,584 More than one year to five years 25,971 26,773 More than five years to ten years 52,572 51,555 More than ten years 5,473 4,467 $ 115,492 $ 114,379 Mortgage-backed securities and collateralized mortgage obligations 963,977 1,002,038 $ 1,079,469 $ 1,116,417 Mortgage-backed securities and collateralized mortgage obligations totaling $964.0 million at amortized cost, and $1.0 billion at fair value, are not classified by maturity in the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. During the three months ended March 31, 2020 , proceeds from the sale of debt securities available for sale totaled $20.8 million , resulting in $369,000 of gross gains and no gross losses. Proceeds from called debt securities available for sale totaled $1.1 million , resulting in $1,000 of gross gains and no gross losses. Proceeds from matured debt securities available for sale totaled $635,000 . During the three months ended March 31, 2019 , there were no sales or calls of debt securities available for sale. Proceeds from one called debt security available for sale totaled $797,000 . No gross gains or losses were recognized on the security which was called. Debt securities available for sale having a carrying value of $649.4 million and $462.0 million , respectively, at March 31, 2020 and December 31, 2019 , respectively, were pledged as security for public funds on deposit at the Bank as required and permitted by law, pledged for outstanding borrowings at the Federal Home Loan Bank, and pledged for potential borrowings at the Federal Reserve Bank of New York. The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2020 and December 31, 2019 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2020 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ — $ — $ — $ — $ — $ — Mortgage-backed securities and collateralized mortgage obligations 50,819 (458 ) 41,392 (359 ) 92,211 (817 ) Municipal obligations — — — — — — Corporate debt securities 26,552 (1,036 ) 3,993 (1,008 ) 30,545 (2,044 ) Trust preferred securities — — 4,081 (918 ) 4,081 (918 ) $ 77,371 $ (1,494 ) $ 49,466 $ (2,285 ) $ 126,837 $ (3,779 ) 6. Debt Securities Available for Sale (continued) December 31, 2019 Less Than 12 Months 12 Months or Longer Total Fair Value — Gross Unrealized (Losses) — Fair Value — Gross Unrealized (Losses) — Fair Value — Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ 5,106 $ (13 ) $ 4,988 $ (3 ) $ 10,094 $ (16 ) Mortgage-backed securities and collateralized mortgage obligations 178,665 (946 ) 58,208 (319 ) 236,873 (1,265 ) Municipal obligations 696 (1 ) — — 696 (1 ) Corporate debt securities 2,588 (5 ) 4,627 (373 ) 7,215 (378 ) Trust preferred securities — — 4,605 (395 ) 4,605 (395 ) $ 187,055 $ (965 ) $ 72,428 $ (1,090 ) $ 259,483 $ (2,055 ) The Company evaluates securities for other-than-temporary impairment at each reporting period and more frequently when economic or market conditions warrant such evaluation. The temporary loss position associated with debt securities available for sale was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at March 31, 2020 , nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery. The number of securities in an unrealized loss position as of March 31, 2020 totaled 46 , compared with 97 at December 31, 2019 . All temporarily impaired securities were investment grade as of March 31, 2020 and December 31, 2019 . The Company did not record an other-than-temporary impairment charge on debt securities available for sale during the three months ended March 31, 2020 and 2019 . Debt securities held to maturity at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 10,000 $ 1 $ — $ 10,001 Mortgage-backed securities and collateralized mortgage obligations 263,152 13,431 (13 ) 276,570 $ 273,152 $ 13,432 $ (13 ) $ 286,571 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 20,000 $ 26 $ (66 ) $ 19,960 Mortgage-backed securities and collateralized mortgage obligations 265,756 4,048 (259 ) 269,545 $ 285,756 $ 4,074 $ (325 ) $ 289,505 The amortized cost and fair value of debt securities held to maturity at March 31, 2020 , by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer. March 31, 2020 Amortized Cost Fair Value (In thousands) More than ten years 10,000 10,001 10,000 10,001 Mortgage-backed securities and collateralized mortgage obligations 263,152 276,570 $ 273,152 $ 286,571 Mortgage-backed securities and collateralized mortgage obligations totaling $263.2 million at amortized cost, and $276.6 million at fair value, are not classified by maturity in the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. During the three months ended March 31, 2020 , there were no sales or maturities of debt securities held to maturity. Proceeds from the call of one debt security held to maturity totaled $10.0 million , resulting in no gross gains and no gross losses. During the three months ended March 31, 2019 , there were no sales, calls or maturities of debt securities held for maturity. Debt securities held to maturity having a carrying value of $239.2 million and $236.0 million , at March 31, 2020 and December 31, 2019 , respectively, were pledged as security for public funds on deposit at the Bank as required and permitted by law, pledged for outstanding borrowings at the Federal Home Loan Bank, and pledged for potential borrowings at the Federal Reserve Bank of New York. 7. Debt Securities Held to Maturity (continued) The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2020 and December 31, 2019 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2020 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) Mortgage-backed securities and collateralized mortgage obligations 1,908 (13 ) — — 1,908 (13 ) $ 1,908 $ (13 ) $ — $ — $ 1,908 $ (13 ) December 31, 2019 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ 9,934 $ (66 ) $ — $ — $ 9,934 $ (66 ) Mortgage-backed securities and collateralized mortgage obligations 27,911 (251 ) 772 (8 ) 28,683 (259 ) $ 37,845 $ (317 ) $ 772 $ (8 ) $ 38,617 $ (325 ) The Company evaluates securities for other-than-temporary impairment at each reporting period and more frequently when economic or market conditions warrant such evaluation. The temporary loss position associated with debt securities held to maturity was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at March 31, 2020 , nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery. There was one security in an unrealized loss position as of March 31, 2020 , compared with 22 at December 31, 2019 . All temporarily impaired securities were investment grade as of March 31, 2020 and December 31, 2019 . The Company did not record an other-than-temporary impairment charge on debt securities held to maturity during the three months ended March 31, 2020 and 2019 . The Company has an equity securities portfolio which consists of stock in other financial institutions, a payment technology company, and a community bank correspondent services company, which is reported at fair value on the Company's Consolidated Statements of Financial Condition. The fair value of the equities portfolio at March 31, 2020 and December 31, 2019 was $2.3 million and $2.9 million , respectively. The Company adopted ASU 2016-01 on January 1, 2019, resulting in a $548,000 after tax cumulative-effect adjustment from other comprehensive income (loss) to retained earnings, as reflected in the Consolidated Statements of Changes in Stockholders' Equity. The Company recorded a net (decrease)/increase in the fair value of equity securities of $(584,000) and $176,000 , during the three months ended March 31, 2020 and 2019 , as a component of non-interest income. 8. Equity Securities at Fair Value (continued) During the three months ended March 31, 2020 , there were no sales of equity securities. During the three months ended March 31, 2019 , proceeds from sales of equity securities totaled $764,000 , resulting in gross gains of $126,000 and no

Loans Receivable and Allowance

Loans Receivable and Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Loans Receivable and Allowance for Loan Losses	Loans Receivable and Allowance for Loan Losses Loans receivable at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, December 31, 2020 2019 (In thousands) Real estate loans: One-to-four family $ 2,071,941 $ 2,077,079 Multifamily and commercial 2,957,589 2,919,985 Construction 316,973 298,942 Commercial business loans 496,157 483,215 Consumer loans: Home equity loans and advances 379,700 388,127 Other consumer loans 1,739 1,960 Total gross loans 6,224,099 6,169,308 Purchased credit-impaired loans 7,021 7,021 Net deferred loan costs, fees and purchased premiums and discounts 21,385 21,237 Loans receivable $ 6,252,505 $ 6,197,566 The Company had no loans held-for-sale at both March 31, 2020 and December 31, 2019 . During the three months ended March 31, 2020 , the Company sold $51.6 million of one-to-four family real estate loans held-for-sale resulting in gross gains of $672,000 and no gross losses. During the three months ended March 31, 2019 the Company sold $8.1 million of one-to-four family real estate loans held-for-sale, resulting in gross gains of $62,000 and no gross losses. During the three months ended March 31, 2020 the Company sold $8.8 million of one-to-four family real estate loans and home equity loans and one commercial business loan for $6.7 million which were included in loans receivable, resulting in gross gains of $82,000 and no gross losses. During the three months ended March 31, 2019 , the Company sold $9.3 million of one-to-four family real estate loans included in loans receivable, resulting in gross gains of $70,000 and no gross losses. During the three months ended March 31, 2020 , there were no loans purchased by the Company. During the three months ended March 31, 2019 , the Company purchased $2.3 million of one-to-four family real estate loans. At March 31, 2020 and December 31, 2019 , the carrying value of loans serviced by the Company for investors was $571.6 million and $526.3 million , respectively. The Company has entered into guarantor swaps with Freddie Mac which results in improved liquidity. During the three months ended March 31, 2020 , no loans were sold. During the three months ended March 31, 2019 , the Company exchanged $6.1 million of loans for a Freddie Mac mortgage participation certificate. The Company retained the servicing of these loans. 9. Loans Receivable and Allowance for Loan Losses (continued) The following tables summarize the aging of loans receivable by portfolio segment, excluding PCI loans at March 31, 2020 and December 31, 2019 : March 31, 2020 30-59 Days 60-89 Days 90 Days or More Total Past Due Current Total (In thousands) Real estate loans: One-to-four family $ 16,907 $ 2,747 $ 3,110 $ 22,764 $ 2,049,177 $ 2,071,941 Multifamily and commercial 3,671 — 2,125 5,796 2,951,793 2,957,589 Construction 2,405 — — 2,405 314,568 316,973 Commercial business loans 4,436 978 4,819 10,233 485,924 496,157 Consumer loans: Home equity loans and advances 3,939 420 223 4,582 375,118 379,700 Other consumer loans — — — — 1,739 1,739 Total loans $ 31,358 $ 4,145 $ 10,277 $ 45,780 $ 6,178,319 $ 6,224,099 December 31, 2019 30-59 Days 60-89 Days 90 Days or More Total Past Due Current Total (In thousands) Real estate loans: One-to-four family $ 6,249 $ 2,132 $ 1,638 $ 10,019 $ 2,067,060 $ 2,077,079 Multifamily and commercial 626 1,210 716 2,552 2,917,433 2,919,985 Construction — — — — 298,942 298,942 Commercial business loans 1,056 — 2,489 3,545 479,670 483,215 Consumer loans: Home equity loans and advances 1,708 246 405 2,359 385,768 388,127 Other consumer loans 3 — — 3 1,957 1,960 Total loans $ 9,642 $ 3,588 $ 5,248 $ 18,478 $ 6,150,830 $ 6,169,308 The Company considers a loan to be delinquent when we have not received a payment within 30 days of its contractual due date. Generally, a loan is designated as a non-accrual loan when the payment of interest is 90 days or more in arrears of its contractual due date. Non-accruing loans are returned to accrual status after there has been a sustained period of repayment performance (generally six consecutive months of payments) and both principal and interest are deemed collectible. The Company identifies loans that may need to be charged-off as a loss, by reviewing all delinquent loans, classified loans and other loans that management may have concerns about collectability. At March 31, 2020 and December 31, 2019 , non-accrual loans totaled $10.7 million and $6.7 million , respectively. Included in non-accrual loans at March 31, 2020 , are seven loans totaling $386,000 which are less than 90 days in arrears. At December 31, 2019 , eight loans totaling $1.5 million were less than 90 days in arrears. At March 31, 2020 and December 31, 2019 , there were no loans past due 90 days or more and still accruing interest. PCI loans are loans acquired at a discount primarily due to deteriorated credit quality. These loans are accounted for at fair value at acquisition, based upon the present value of expected future cash flows, with no related allowance for loan losses. PCI loans acquired in the Stewardship acquisition totaled $7.0 million at both March 31, 2020 and December 31, 2019 . 9. Loans Receivable and Allowance for Loan Losses (continued) The following table presents changes in accretable yield for PCI loans for the three months ended March 31, 2020 . There were no PCI loans outstanding for the quarter ended March 31, 2019. For the Three Months Ended March 31, 2020 (In thousands) Balance at beginning of period $ 511 Accretion (49 ) Net change in expected cash flows 1 Balance at end of period $ 463 The following table provides information with respect to our non-accrual loans, excluding PCI loans at March 31, 2020 and December 31, 2019 : March 31, December 31, 2020 2019 (In thousands) Non-accrual loans: Real estate loans: One-to-four family $ 3,201 $ 1,732 Multifamily and commercial 2,125 716 Commercial business loans 4,864 3,686 Consumer loans: Home equity loans and advances 473 553 Total non-accrual loans $ 10,663 $ 6,687 We may obtain physical possession of real estate collateralizing a residential mortgage loan via foreclosure or through an in-substance repossession. At March 31, 2020 and December 31, 2019 , the Company had no real estate owned. At March 31, 2020 and December 31, 2019 , we had one and four residential mortgage loans with carrying values of $180,000 and $522,000 , respectively, collateralized by residential real estate which are in the process of foreclosure. 9. Loans Receivable and Allowance for Loan Losses (continued) The following tables summarize loans receivable (including PCI loans) and allowance for loan losses by portfolio segment and impairment method at March 31, 2020 and December 31, 2019 : March 31, 2020 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Allowance for loan losses: Individually evaluated for impairment $ 468 $ 2 $ — $ 1,064 $ 17 $ — $ 1,551 Collectively evaluated for impairment 16,330 26,083 9,399 16,127 1,701 9 69,649 Loans acquired with deteriorated credit quality — — — — — — — Total $ 16,798 $ 26,085 $ 9,399 $ 17,191 $ 1,718 $ 9 $ 71,200 Total loans: Individually evaluated for impairment $ 8,483 $ 14,960 $ — $ 6,448 $ 2,117 $ — $ 32,008 Collectively evaluated for impairment 2,063,458 2,942,629 316,973 489,709 377,583 1,739 6,192,091 Loans acquired with deteriorated credit quality 372 4,963 — 1,686 — — 7,021 Total loans $ 2,072,313 $ 2,962,552 $ 316,973 $ 497,843 $ 379,700 $ 1,739 $ 6,231,120 December 31, 2019 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Allowance for loan losses: Individually evaluated for impairment $ 484 $ 2 $ — $ 1,121 $ 14 $ — $ 1,621 Collectively evaluated for impairment 13,296 22,978 7,435 14,715 1,655 9 60,088 Loans acquired with deteriorated credit quality — — — — — — — Total $ 13,780 $ 22,980 $ 7,435 $ 15,836 $ 1,669 $ 9 $ 61,709 Total loans: Individually evaluated for impairment $ 8,891 $ 2,599 $ — $ 5,178 $ 2,143 $ — $ 18,811 Collectively evaluated for impairment 2,068,188 2,917,386 298,942 478,037 385,984 1,960 6,150,497 Loans acquired with deteriorated credit quality 429 4,866 — 1,726 — — 7,021 Total loans $ 2,077,508 $ 2,924,851 $ 298,942 $ 484,941 $ 388,127 $ 1,960 $ 6,176,329 9. Loans Receivable and Allowance for Loan Losses (continued) Loan modifications to borrowers experiencing financial difficulties that are considered troubled debt restructurings ("TDRs") primarily involve the lowering of the monthly payments on such loans through either a reduction in interest rate below a market rate, an extension of the term of the loan without a corresponding adjustment to the risk premium reflected in the interest rate, or a combination of these two methods. These modifications generally do not result in the forgiveness of principal or accrued interest. In addition, the Company attempts to obtain additional collateral or guarantor support when modifying such loans. Non-accruing restructured loans may be returned to accrual status when there has been a sustained period of repayment performance (generally six consecutive months of payments) and both principal and interest are deemed collectible. Section 4013 of the CARES Act, “Temporary Relief from Troubled Debt Restructurings,” allows banks to temporarily suspend certain requirements under GAAP related to TDRs for a limited period of time to account for the effects of COVID-19. The Bank elected to account for modifications on certain loans under Section 4013 of the CARES Act or, if the loan modification was not eligible under Section 4013, used the criteria in the COVID-19 guidance to determine when the loan modification was not a TDR in accordance with ASC 310-40. Guidance noted that modification or deferral programs mandated by the federal or a state government related to COVID-19 would not be in the scope of ASC 310-40, such as a state program that requires all institutions within that state to suspend mortgage payments for a specified period. The following table presents the number of loans modified as TDRs during the three months ended March 31, 2020 and 2019 , along with their balances immediately prior to the modification date and post-modification. Post-modification recorded investment represents the net book balance immediately following modification. For the Three Months Ended March 31, 2020 2019 No. of Loans Pre-modification Recorded Investment Post-modification Recorded Investment No. of Loans Pre-modification Recorded Investment Pre-modification Recorded Investment (Dollars in thousands) Troubled Debt Restructurings Real estate loans: Multifamily and commercial 1 10,212 11,507 1 4,095 4,095 Total restructured loans 1 $ 10,212 $ 11,507 1 $ 4,095 $ 4,095 9. Loans Receivable and Allowance for Loan Losses (continued) The activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2020 and 2019 are as follows: For the Three Months Ended March 31, One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Unallocated Total (In thousands) 2020 Balance at beginning of period $ 13,780 $ 22,980 $ 7,435 $ 15,836 $ 1,669 $ 9 $ — $ 61,709 Provision charged (credited) 3,101 3,096 1,964 1,347 59 1 — 9,568 Recoveries 3 10 — 71 14 — — 98 Charge-offs (86 ) (1 ) — (63 ) (24 ) (1 ) — (175 ) Balance at end of period $ 16,798 $ 26,085 $ 9,399 $ 17,191 $ 1,718 $ 9 $ — $ 71,200 2019 Balance at beginning of period $ 15,232 $ 23,251 $ 7,217 $ 14,176 $ 2,458 $ 8 $ — $ 62,342 Provision charged (credited) 2,122 (2,265 ) 1,816 (1,996 ) 761 (2 ) — 436 Recoveries 21 — — 313 7 — — 341 Charge-offs — — — (268 ) (80 ) — — (348 ) Balance at end of period $ 17,375 $ 20,986 $ 9,033 $ 12,225 $ 3,146 $ 6 $ — $ 62,771 9. Loans Receivable and Allowance for Loan Losses (continued) The following tables present loans individually evaluated for impairment by loan segment, excluding PCI loans, at March 31, 2020 and December 31, 2019 : At March 31, 2020 Recorded Investment Unpaid Principal Balance Specific Allowance (In thousands) With no allowance recorded: Real estate loans: One-to-four family $ 3,857 $ 5,021 $ — Multifamily and commercial 13,862 14,601 — Commercial business loans 5,168 5,356 — Consumer loans: Home equity loans and advances 1,063 1,201 — 23,950 26,179 — With a specific allowance recorded: Real estate loans: One-to-four family 4,626 4,657 468 Multifamily and commercial 1,098 1,098 2 Commercial business loans 1,280 4,267 1,064 Consumer loans: Home equity loans and advances 1,054 1,054 17 8,058 11,076 1,551 Total: Real estate loans: One-to-four family 8,483 9,678 468 Multifamily and commercial 14,960 15,699 2 Commercial business loans 6,448 9,623 1,064 Consumer loans: Home equity loans and advances 2,117 2,255 17 Total loans $ 32,008 $ 37,255 $ 1,551 9. Loans Receivable and Allowance for Loan Losses (continued) At December 31, 2019 Recorded Investment Unpaid Principal Balance Specific Allowance (In thousands) With no allowance recorded: Real estate loans: One-to-four family $ 4,314 $ 5,473 $ — Multifamily and commercial 1,494 2,191 — Commercial business loans 3,859 4,048 — Consumer loans: Home equity loans and advances 1,080 1,217 — 10,747 12,929 — With a specific allowance recorded: Real estate loans: One-to-four family 4,577 4,613 484 Multifamily and commercial 1,105 1,105 2 Commercial business loans 1,319 4,307 1,121 Consumer loans: Home equity loans and advances 1,063 1,063 14 8,064 11,088 1,621 Total: Real estate loans: One-to-four family 8,891 10,086 484 Multifamily and commercial 2,599 3,296 2 Commercial business loans 5,178 8,355 1,121 Consumer loans: Home equity loans and advances 2,143 2,280 14 $ 18,811 $ 24,017 $ 1,621 Specific allocations of the allowance for loan losses attributable to impaired loans totaled $1.6 million at both March 31, 2020 and December 31, 2019 . At March 31, 2020 and December 31, 2019 , impaired loans for which there was no related allowance for loan losses totaled $24.0 million and $10.7 million , respectively. The recorded investment in TDRs totaled $31.3 million at March 31, 2020 , of which seven loans totaling $1.9 million were 30-59 days past due, one loan totaling $352,000 was 60-89 days past due, and two loans totaling $1.2 million were 90 days past due. The remaining loans modified were current at the time of restructuring and have complied with the terms of their restructure agreement at March 31, 2020 . The recorded investment in TDRs totaled $20.0 million at December 31, 2019 , of which there no loans were over 90 days past due and three loans totaling $660,000 were 30-59 days past due. The remaining loans modified were current at the time of restructuring and have complied with the terms of their restructure agreement at December 31, 2019 . 9. Loans Receivable and Allowance for Loan Losses (continued) The following tables present interest income recognized for loans individually evaluated for impairment, by loan segment, excluding PCI loans for the three months ended March 31, 2020 and 2019 : For the Three Months Ended March 31, 2020 2019 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (In thousands) Real estate loans: One-to-four family $ 8,688 $ 99 $ 8,807 $ 106 Multifamily and commercial 8,780 166 2,683 37 Construction — — 1,700 25 Commercial business loans 5,814 72 5,409 80 Consumer loans: Home equity loans and advances 2,130 30 2,847 52 Total loans $ 25,412 $ 367 $ 21,446 $ 300 The Company utilizes an eight-point risk rating system to summarize its loan portfolio into categories with similar risk characteristics. Loans deemed to be “acceptable quality” are rated 1 through 4 (Pass), with a rating of 1 established for loans with minimal risk. Loans that are deemed to be of “questionable quality” are rated 5 (Special Mention) or 6 (Substandard). Loans with adverse classifications are rated 7 (Doubtful) or 8 (Loss). The risk ratings are also confirmed through periodic loan review examinations which are currently performed by both an independent third-party and the Company's credit risk review department. The Company requires an annual review be performed above certain dollar thresholds, depending on loan type, to help determine the appropriate risk ratings. Results from examinations are presented to the Audit Committee of the Board of Directors. The following tables present loans receivable by credit quality risk indicator and by loan segment, excluding PCI loans at March 31, 2020 and December 31, 2019 : March 31, 2020 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Pass $ 2,067,000 $ 2,936,799 $ 316,973 $ 468,205 $ 378,878 $ 1,739 $ 6,169,594 Special mention 414 4,343 — 16,264 — — 21,021 Substandard 4,527 16,447 — 11,688 822 — 33,484 Doubtful — — — — — — — Loss — — — — — — — Total $ 2,071,941 $ 2,957,589 $ 316,973 $ 496,157 $ 379,700 $ 1,739 $ 6,224,099 9. Loans Receivable and Allowance for Loan Losses (continued) December 31, 2019 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Pass $ 2,072,878 $ 2,900,286 $ 298,942 $ 454,183 $ 387,251 $ 1,960 $ 6,115,500 Special mention 419 4,724 — 20,170 — — 25,313 Substandard 3,782 14,975 — 8,862 876 — 28,495 Doubtful — — — — — — — Loss — — — — — — — Total $ 2,077,079 $ 2,919,985 $ 298,942 $ 483,215 $ 388,127 $ 1,960 $ 6,169,308

Leases

Leases	3 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Leases	Leases Effective January 1, 2020, the Company adopted ASU 2016-02 Leases (Topic 842) and all subsequent ASU's that modified Topic 842, as explained in note 5, Summary of Significant Accounting Policies, Accounting Pronouncements Adopted. The Company's leases primarily relate to real estate property for branches and office space. At March 31, 2020 , all of the Company's leases are classified as operating leases. The Company determines if an arrangement is a lease at inception. Topic 842 requires lessees to recognize a right-of-use asset and a lease liability, measured at the present value of the future minimum lease payments, at the lease commencement date. At the time of adoption, an operating lease right-of-use asset of $22.2 million and operating lease liabilities of $23.3 million were recorded in other assets and other liabilities, respectively on our Consolidated Statements of Financial Condition. The calculated amount of the right-of-use asset and lease liabilities are impacted by the length of the lease term and the discount rate used to calculate the present value of minimum lease payments. As the Company's leases do not provide an implicit rate, the discount rate used in determining the lease liability for each individual lease was the Company's incremental borrowing rate at the time of adoption of ASU 2016-02, on a collateralized basis, over a similar term. Certain leases include options to renew, with one or more renewal terms usually ranging from 5 years to 10 years . For each lease, these extension options were evaluated, and those which were considered reasonably certain of renewal were included in the lease term. As of March 31, 2020 , the weighted average remaining lease term for operating leases was 8.0 years and the weighted average discount rate used in the measurement of operating lease liabilities was 2.28% . The Company elected to account for the lease and non-lease components separately since such amounts are readily determinable under the Company's lease contracts. Operating lease expense is recognized on a straight-line basis over the lease term, while variable lease payments are recognized as incurred. Variable lease payments include common area maintenance charges, real estate taxes, repairs and maintenance costs and utilities. Operating and variable lease expenses are recorded in occupancy expense in the Consolidated Statements of Income. During the three months ended March 31, 2020 , operating and variable lease expenses totaled approximately $694,000 . There were no sale and leaseback transactions, leveraged leases or lease transactions with related parties during the three months ended March 31, 2020 . At March 31, 2020 , the Company had no leases that had not yet commenced. 10. Leases (continued) The following table summarizes lease payment obligations for each of the next five years and thereafter as follows: At March 31, 2020 Lease Payment Obligations (In thousands) 2020 $ 2,685 2021 3,407 2022 3,170 2023 2,941 2024 2,378 Thereafter 7,800 Total lease commitments $ 22,381 At December 31, 2019, operating lease commitments under lessee arrangements were $4.9 million , $4.5 million , $4.0 million , $3.5 million and $2.7 million for 2020 through 2024, respectively, and $5.0 million in aggregate for all years thereafter.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2020
Banking and Thrift [Abstract]
Deposits	Deposits Deposits at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, December 31, 2020 2019 (In thousands) Non-interest-bearing demand $ 1,039,303 $ 958,442 Interest-bearing demand 1,750,123 1,720,383 Money market accounts 423,171 410,392 Savings and club deposits 550,068 543,480 Certificates of deposit 2,009,753 2,013,145 Total deposits $ 5,772,418 $ 5,645,842 Included in the above balances at March 31, 2020 and December 31, 2019 are certificates of deposit obtained through brokers, of $26.5 million and $31.6 million that were acquired from Stewardship. The aggregate amount of certificates of deposit that meet or exceed $100,000 totaled approximately $1.1 billion at both March 31, 2020 and December 31, 2019 . Interest expense on deposits for the three months ended March 31, 2020 and 2019 totaled $16.8 million and $13.7 million , respectively. 11. Deposits (continued) Scheduled maturities of certificates of deposit accounts at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, December 31, 2020 2019 (In thousands) One year or less $ 1,358,136 $ 1,293,613 After one year to two years 532,914 548,995 After two years to three years 86,956 142,458 After three years to four years 10,961 11,362 After four years 20,786 16,717 $ 2,009,753 $ 2,013,145

Stock Based Compensation

Stock Based Compensation	3 Months Ended
	Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
Stock Based Compensation	Stock Based Compensation At the Company's 2019 annual meeting held on June 6, 2019, stockholders approved the Columbia Financial, Inc. 2019 Equity Incentive Plan ("2019 Plan") which provides for the issuance of up to 7,949,996 shares ( 2,271,427 restricted stock awards and 5,678,569 stock options) of Columbia Financial Inc. common stock. On July 23, 2019, 1,419,131 shares of restricted stock were awarded, with a grant date fair value of $15.60 per share. To fund the grant of restricted common stock, the Company issued shares from authorized unissued shares. On December 16, 2019, 74,673 shares of restricted stock were awarded, with a grant date fair value of $ 17.00 per share. To fund the grant of restricted common stock, the Company reissued shares from treasury stock. Restricted shares granted under the 2019 Plan generally vest in equal installments, over the performance or service periods ranging from three to five years , beginning one year from the date of grant. A portion of restricted shares awarded are performance vesting awards, which may or may not vest depending upon the attainment of certain corporate financial targets. Management recognizes compensation expense for the fair value of restricted shares on a straight line basis over the requisite performance or service period. During the three months ended March 31, 2020 , approximately $1.4 million in expense was recognized in regard to these awards. There was no restricted stock expense recorded for the three months ended March 31, 2019 . The expected future compensation expense related to the 1,419,131 non-vested restricted shares outstanding at March 31, 2020 is approximately $18.5 million over a weighted average period of 4.3 years. The following is a summary of the Company's restricted stock activity during the three months ended March 31, 2020 : Number of Restricted Shares Weighted Average Grant Date Fair Value Outstanding, January 1, 2020 1,420,012 $ 15.67 Granted — — Forfeited (881 ) 15.60 Outstanding, March 31, 2020 1,419,131 $ 15.67 On July 23, 2019, options to purchase 3,589,959 shares of Company common stock were awarded, with a grant date fair value of $4.25 per option. Stock options granted under the 2019 Plan vest in equal installments over the service period of five years beginning one year from the date of grant. Stock options were granted at an exercise price of $15.60 , which represents the fair value of the Company's common stock price on the grant date based on the closing market price, and have an expiration period of 10 years. The fair value of stock options granted was estimated utilizing the Black-Scholes option pricing model using the following assumptions: expected life of 6.5 years, risk-free rate of return of 1.90% , volatility of 22.12% , and a dividend yield of 0.00% . 12. Stock Based Compensation (Continued) On December 16, 2019, options to purchase 184,378 shares of Company common stock were awarded with a grant date fair value of $4.59 per option. Stock options granted under the 2019 Plan generally vest in equal installments over the service period of five years beginning one year from the date of grant. Stock options were granted at an exercise price of $17.00 , which represents the fair value of the Company's common stock price on the grant date based on the closing market price, and have an expiration period of approximately 10 years . The fair value of stock options granted was estimated utilizing the Black-Scholes option pricing model using the following assumptions: expected life of 6.5 years , risk-free rate of return of 1.79% , volatility of 22.23% , and a dividend yield of 0.00% . The expected life of the options represents the period of time that stock options are expected to be outstanding and is estimated using the simplified approach, which assumes that all outstanding options will be exercised at the midpoint of the vesting date and full contractual term. The risk-free rate of return is based on the rates on the grant date of a U.S. Treasury Note with a term equal to the expected option life. Since the Company recently converted to a public Company and does not have sufficient historical price data, the expected volatility is based on the historical daily stock prices of a peer group of similar entities based on factors such as industry, stage of life cycle, size and financial leverage. The Company has not paid any cash dividends on its common stock. Management recognizes expense for the fair value of these awards on a straight line basis over the requisite service period. During the three months ended March 31, 2020 , approximately $798,500 in expense was recognized in regard to these awards. There was no stock option expense recorded for the three months ended March 31, 2019 . The expected future compensation expense related to the 3,774,337 non-vested options outstanding at March 31, 2020 is $14.0 million over a weighted average period of 4.3 years. The following is a summary of the Company's option activity for the three months ended March 31, 2020 : Number of Stock Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding, January 1, 2020 3,784,044 $ 15.67 9.6 $ 4,812,490 Granted — — — — Forfeited (9,707 ) 15.60 — — Outstanding, March 31, 2020 3,774,337 $ 15.67 9.3 $ 0 Options exercisable at March 31, 2020 — $ — — $ — The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value, the difference between the Company's closing stock price on the last trading day of the period and the exercise price, multiplied by the number of in-the-money options. There were no stock option exercises during the three months ended March 31, 2020 and 2019 .

Components of Net Periodic Bene

Components of Net Periodic Benefit Costs	3 Months Ended
	Mar. 31, 2020
Retirement Benefits [Abstract]
Components of Periodic Benefit Costs	Components of Net Periodic Benefit Cost Pension Plan, Retirement Income Maintenance Plan (the "RIM Plan") and Post-retirement Plan The Company maintains a single employer, tax-qualified defined benefit pension plan (the "Pension Plan") which covers full-time employees that satisfy the Pension Plan's eligibility requirements. The benefits are based on years of service and the employee's average compensation for the highest five consecutive years of employment. Effective October 1, 2018, employees hired by the Bank are not eligible to participate in the Bank's Pension Plan as the plan has been closed to new employees as of that date. The Company also has a Retirement Income Maintenance Plan (the "RIM "Plan) which is a non-qualified defined benefit plan which provides benefits to all employees of the Company if their benefits under the Pension Plan are limited by Internal Revenue Code 415 and 401(a)(17). In addition, the Company provides certain health care and life insurance benefits to eligible retired employees under a Post-retirement Plan. The Company accrues the cost of retiree health care and other benefits during the employees’ period of active service. Effective January 1, 2019, the Post-retirement Plan has been closed to new hires. The Company also provides life insurance benefits to eligible employees under an endorsement split-dollar life insurance program. 13. Components of Net Periodic Benefit Cost (continued) Net periodic benefit (income) cost for Pension Plan, RIM Plan, Post-retirement Plan and split-dollar life insurance arrangement plan benefits for the three months ended March 31, 2020 and 2019 , includes the following components: For the Three Months Ended March 31, Pension Plan RIM Plan Post-retirement Plan Split-Dollar Life Insurance 2020 2019 2020 2019 2020 2019 2020 2019 Affected Line Item in the Consolidated Statements of Income (In thousands) Service cost $ 1,937 $ 1,501 $ 67 $ 53 $ 99 $ 84 $ 106 $ 88 Compensation and employee benefits Interest cost 2,031 2,194 102 116 171 207 114 114 Other non-interest expense Expected return on plan assets (5,737 ) (4,727 ) — — — — — — Other non-interest expense Amortization: Prior service cost — — — — — — 14 14 Other non-interest expense Net loss 781 765 99 61 77 37 113 62 Other non-interest expense Net periodic (income) benefit cost $ (988 ) $ (267 ) $ 268 $ 230 $ 347 $ 328 $ 347 $ 278 For the three months ended March 31, 2020 , no contributions were made to the Pension Plan. The net periodic cost (income) for pension benefits, other post-retirement and split dollar life insurance benefits for the three months ended March 31, 2020 were calculated using the most recent available benefit valuations.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The determination of fair values of financial instruments often requires the use of estimates. Where quoted market values in an active market are not readily available, the Company utilizes various valuation techniques to estimate fair value. In January 2016, the FASB issued ASU 2016-01- "Financial Instruments". This guidance amended existing guidance to improve accounting standards for financial instruments including clarification and simplification of the accounting and disclosure requirements and the requirement to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The Company adopted the guidance effective January 1, 2019, and the fair value of the Company's loan portfolio is now presented using an exit price method. Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair values: Level 1: Unadjusted quoted prices for identical assets or liabilities in active markets that the Company has the ability to access on the measurement date. Level 2: Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in markets that are active or not active, or inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability. Level 3: Prices or valuation techniques that require unobservable inputs that are both significant to the fair value measurement and unobservable (i.e., supported by minimal or no market activity). Valuation techniques include the use of option pricing models, discounted cash flow models and similar techniques. 14. Fair Value Measurements (continued) A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Assets and Liabilities Measured at Fair Value on a Recurring Basis The methods described below were used to measure fair value of financial instruments as reflected in the tables below on a recurring basis as of March 31, 2020 and December 31, 2019 . Debt Securities Available for Sale, at Fair Value For debt securities available for sale, fair value was estimated using a market approach. The majority of these securities are fixed income instruments that are not quoted on an exchange, but are traded in active markets. Prices for these instruments are obtained through third-party data service providers or dealer market participants with which the Company has historically transacted both purchases and sales of securities. Prices obtained from these sources include market quotations and matrix pricing. Matrix pricing, a Level 2 input, is a mathematical technique used principally to value certain securities to a benchmark or to comparable securities. The Company evaluates the quality of Level 2 matrix pricing through comparison to similar assets with greater liquidity and evaluation of projected cash flows. As the Company is responsible for the determination of fair value, it performs quarterly analysis on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, the Company compares the prices received from the pricing service to a secondary pricing source. Additionally, the Company compares changes in the reported market values and returns to relevant market indices to assess the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has not historically resulted in an adjustment in the prices obtained from the pricing service. The Company may hold debt instruments issued by the U.S. government and U.S. government-sponsored agencies that are traded in active markets with readily accessible quoted market prices that are considered Level 1 inputs. Equity Securities, at Fair Value The Company holds equity securities that are traded in active markets with readily accessible quoted market prices that are considered Level 1 inputs. A trust preferred security that is not traded in an active market, an Atlantic Community Bankers Bank ("ACCB") stock which is based on redemption at par value and can only be sold to the issuing ACBB or another institution that holds ACBB or another institution that holds ACBB stock are considered Level 2 instruments. Derivatives The Company records all derivatives included in other assets and liabilities on the Consolidated Statements of Financial Condition at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. See note 16 for disclosures related to the accounting treatment for derivatives. The fair value of the Company's derivatives is determined using discounted cash flow analysis using observable market-based inputs, which are considered Level 2 inputs. The following tables present the assets and liabilities reported on the Consolidated Statements of Financial Condition at their fair values as of March 31, 2020 and December 31, 2019 , by level within the fair value hierarchy: 14. Fair Value Measurements (continued) March 31, 2020 Fair Value Measurements Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Debt securities available for sale: U.S. government and agency obligations $ 42,213 $ 42,213 $ — $ — Mortgage-backed securities and collateralized mortgage obligations 1,002,038 — 1,002,038 — Municipal obligations 959 — 959 — Corporate debt securities 67,125 — 67,125 — Trust preferred securities 4,082 — 4,082 — Total debt securities available for sale 1,116,417 42,213 1,074,204 — Equity securities 2,271 2,018 253 — Derivative assets — — — — $ 1,118,688 $ 44,231 $ 1,074,457 $ — Derivative liabilities $ 26,194 $ — $ 26,194 $ — December 31, 2019 Fair Value Measurements Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Debt securities available for sale: U.S. government and agency obligations $ 42,386 $ 42,386 $ — $ — Mortgage-backed securities and collateralized mortgage obligations 979,881 — 979,881 — Municipal obligations 2,284 — 2,284 — Corporate debt securities 69,180 — 69,180 — Trust preferred securities 4,605 — 4,605 — Total debt securities available for sale 1,098,336 42,386 1,055,950 — Equity securities 2,855 2,587 268 Derivative assets 185 — 185 — $ 1,101,376 $ 44,973 $ 1,056,403 $ — Derivative liabilities $ 11,546 $ — $ 11,546 $ — There were no Level 3 assets measured at fair value on a recurring basis at March 31, 2020 and December 31, 2019 . 14. Fair Value Measurements (continued) Assets Measured at Fair Value on a Non-Recurring Basis The valuation techniques described below were used to estimate fair value of financial instruments measured on a non-recurring basis as of March 31, 2020 and December 31, 2019 . Collateral Dependent Impaired Loans Loans which meet certain criteria are evaluated individually for impairment. For loans measured for impairment based on the fair value of the underlying collateral, fair value was estimated using a market approach. The Company measures the fair value of collateral underlying impaired loans primarily through obtaining independent appraisals that rely upon quoted market prices for similar assets in active markets. These appraisals include adjustments, on an individual case-by-case basis, to comparable assets based on the appraisers’ market knowledge and experience, as well as adjustments for estimated costs to sell between 6.0% and 8.0% . The Company classifies these loans as Level 3 within the fair value hierarchy. Mortgage Servicing Rights, Net ("MSR's") Mortgage servicing rights are carried at the lower of cost or estimated fair value. The estimated fair value of MSRs is obtained through an analysis of future cash flows, incorporating assumptions that market participants would use in determining fair value including market discount rates, prepayments speeds, servicing income, servicing costs, default rates and other market driven data, including the market's perception of future interest rate movements. The prepayment speed and the discount rate are considered two of the most significant inputs in the model. A significant degree of judgment is involved in valuing the mortgage servicing rights using Level 3 inputs. The use of different assumptions could have a significant effect on this fair value estimate. The following tables present the assets and liabilities reported on the Consolidated Statements of Financial Condition at their fair values as of March 31, 2020 and December 31, 2019 , by level within the fair value hierarchy: March 31, 2020 Fair Value Measurements Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Mortgage servicing rights $ 510 $ — $ — $ 510 $ 510 $ — $ — $ 510 December 31, 2019 Fair Value Measurements Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Impaired loans $ 1,063 $ — $ — $ 1,063 Mortgage servicing rights 681 — — 681 $ 1,744 $ — $ — $ 1,744 14. Fair Value Measurements (continued) At March 31, 2020 , there were no impaired loans or real estate owned measured at fair value on a non-recurring basis. The following table presents information for Level 3 assets measured at fair value on a non-recurring basis as of March 31, 2020 and December 31, 2019 : March 31, 2020 Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Weighted Average (Dollars in thousands) Mortgage servicing rights $ 510 Estimated cash flow Prepayment speeds and discount rates (3) 8.1% - 31.4% 17.7% December 31, 2019 Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Weighted Average (Dollars in thousands) Impaired loans $ 1,063 Estimated cash flow Expected value of future cash flows (1) —% —% Mortgage servicing rights 681 Estimated cash flow Prepayment speeds and discount rates (2) 3.6% - 24.0% 12.7% (1) Value based on management's estimate of expected future cash flows. (2) Value of SBA servicing rights based on a discount rate of 11.75%. (3) Value of SBA servicing rights based on a discount rate of 10.25%. Other Fair Value Disclosures The Company is required to disclose estimated fair value of financial instruments, both assets and liabilities on and off the balance sheet, for which it is practicable to estimate fair value. A description of the valuation methodologies used for those assets and liabilities not recorded at fair value on a recurring or non-recurring basis are set forth below. Cash and Cash Equivalents For cash and due from banks, federal funds sold and short-term investments, the carrying amount approximates fair value due to their nature and short-term maturities. Debt Securities Held to Maturity For debt securities held to maturity, fair value was estimated using a market approach. The majority of the Company’s securities are fixed income instruments that are not quoted on an exchange, but are traded in active markets. Prices for these instruments are obtained through third-party data service providers or dealer market participants with which the Company has historically transacted both purchases and sales of securities. Prices obtained from these sources include market quotations and matrix pricing. Matrix pricing, a Level 2 input, is a mathematical technique used principally to value certain securities to a benchmark or to comparable securities. The Company evaluates the quality of Level 2 matrix pricing through comparison to similar assets with greater liquidity and evaluation of projected cash flows. As the Company is responsible for the determination of fair value, it performs quarterly analysis on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, the Company compares the prices received from the pricing service to a secondary pricing source. Additionally, the Company compares changes in the reported market values and returns to relevant market indices to assess the reasonableness of the reported prices. The Company’s internal price verification procedures 14. Fair Value Measurements (continued) and review of fair value methodology documentation provided by independent pricing services has not historically resulted in an adjustment in the prices obtained from the pricing service. The Company also holds debt instruments issued by the U.S. government and U.S. government-sponsored agencies that are traded in active markets with readily accessible quoted market prices that are considered Level 1 inputs within the fair value hierarchy. Federal Home Loan Bank Stock ("FHLB") The fair value of FHLB stock is based on redemption at par value and can only be sold to the issuing FHLB, to other FHLBs, or to other member banks. As such, the Company's FHLB stock is recorded at cost, or par value, and is evaluated for impairment each reporting period by considering the ultimate recoverability of the investment rather than temporary declines in value. The Company classifies the estimated fair value as Level 2 within the fair value hierarchy. Loans Receivable Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial mortgage, residential mortgage, commercial, construction, and consumer and other. Each loan category is further segmented into fixed and adjustable rate interest terms and into performing and non-performing categories. The fair value of performing loans was estimated using a combination of techniques, including a discounted cash flow model that utilizes a discount rate that reflects the Company's current pricing for loans with similar characteristics and remaining maturity, adjusted by an amount for estimated credit losses inherent in the portfolio at the balance sheet date. The rates take into account the expected yield curve, as well as an adjustment for prepayment risk, when applicable. The Company classifies the estimated fair value of its loan portfolio as Level 3 . The fair value for non-performing loans deemed significant was based on recent external appraisals of collateral securing such loans, adjusted for the timing of anticipated cash flows. The Company classifies the estimated fair value of its non-performing loan portfolio as Level 3 . In accordance with the prospective adoption of ASU 2016-01, the fair value of loans was measured using the exit price method as of March 31, 2020 . The fair value of loans was measured using the entry price notion as of December 31, 2019 . Deposits The fair value of deposits with no stated maturity, such as demand, money market, and savings and club deposits are payable on demand at each reporting date and classified as Level 2 . The estimated fair value of certificates of deposit was based on the discounted value of contractual cash flows. The discount rate was estimated using the Company’s current rates offered for deposits with similar remaining maturities. The Company classifies the estimated fair value of its certificates of deposit portfolio as Level 2 . Borrowings The fair value of borrowings was estimated by discounting future cash flows using rates available for debt with similar terms and maturities and is classified by the Company as Level 2 within the fair value hierarchy. Commitments to Extend Credit and Letters of Credit The fair value of commitments to extend credit and letters of credit was estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counter-parties. For fixed rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value estimates of commitments to extend credit and letters of credit are deemed immaterial. 14. Fair Value Measurements (continued) The following tables present the assets and liabilities reported on the Consolidated Statements of Financial Condition at their fair values as of March 31, 2020 and December 31, 2019 : March 31, 2020 Fair Value Measurements Carrying Value Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Financial assets: Cash and cash equivalents $ 88,324 $ 88,324 $ 88,324 $ — $ — Debt securities available for sale 1,116,417 1,116,417 42,213 1,074,204 — Debt securities held to maturity 273,152 286,571 10,001 276,570 — Equity securities 2,271 2,271 2,018 253 — Federal Home Loan Bank stock 68,233 68,233 — 68,233 — Loans receivable, net 6,181,305 6,087,507 — — 6,087,507 Financial liabilities: — Deposits $ 5,772,418 $ 5,795,732 $ — $ 5,795,732 $ — Borrowings 1,376,941 1,390,559 — 1,390,559 — Derivative liabilities 26,194 26,194 — 26,194 — December 31, 2019 Fair Value Measurements Carrying Value Total Fair Value Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) (In thousands) Financial assets: Cash and cash equivalents $ 75,547 $ 75,547 $ 75,547 $ — $ — Debt securities available for sale 1,098,336 1,098,336 42,386 1,055,950 — Debt securities held to maturity 285,756 289,505 19,960 269,545 — Equity securities 2,855 2,855 2,587 268 — Federal Home Loan Bank stock 69,579 69,579 — 69,579 — Loans receivable, net 6,135,857 6,219,008 — — 6,219,008 Derivative assets 185 185 — 185 — Financial liabilities: Deposits $ 5,645,842 $ 5,654,075 $ — $ 5,654,075 $ — Borrowings 1,407,022 1,411,962 — 1,411,962 — Derivative liabilities 11,546 11,546 — 11,546 — 14. Fair Value Measurements (continued) Limitations Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because limited markets exist for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on and off balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Other significant assets and liabilities that are not considered financial assets or liabilities include goodwill and intangibles assets, deferred tax assets, office properties and equipment, and bank-owned life insurance.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The following tables present the components of other comprehensive income (loss), both gross and net of tax, for the three months ended March 31, 2020 and 2019 : For the Three Months Ended March 31, 2020 2019 Before Tax Tax Effect After Tax Before Tax Tax Effect After Tax (In thousands) Components of other comprehensive income (loss): Unrealized gains on debt securities available for sale: $ 24,383 $ (5,116 ) $ 19,267 $ 11,766 $ (2,471 ) $ 9,295 Accretion of unrealized gain on debt securities reclassified as held to maturity 8 (2 ) 6 13 (3 ) 10 Reclassification adjustment for gains included in net income 370 (81 ) 289 126 (26 ) 100 24,761 (5,199 ) 19,562 11,905 (2,500 ) 9,405 Derivatives: Unrealized (loss) on swap contracts accounted for as cash flow hedges (14,360 ) 3,011 (11,349 ) (3,520 ) 740 (2,780 ) (14,360 ) 3,011 (11,349 ) (3,520 ) 740 (2,780 ) Employee benefit plans: Amortization of prior service cost included in net income 42 (9 ) 33 (32 ) 7 (25 ) Reclassification adjustment of actuarial net gain included in net income 2,638 (554 ) 2,084 164 (34 ) 130 Change in funded status of retirement obligations (1,595 ) 335 (1,260 ) (132 ) 27 (105 ) 1,085 (228 ) 857 — — — Total other comprehensive income $ 11,486 $ (2,416 ) $ 9,070 $ 8,385 $ (1,760 ) $ 6,625 15. Other Comprehensive Income (Loss) (continued) The following tables present the changes in the components of accumulated other comprehensive income (loss), net of tax, for the three months ended March 31, 2020 and 2019 : For the Three Months Ended March 31, 2020 2019 Unrealized Gains on Debt Securities Available for Sale Unrealized (Losses) on Swaps Employee Benefit Plans Accumulated Other Comprehensive (Loss) Unrealized (Losses) on Debt Securities Available for Sale Unrealized Gains on Swaps Employee Benefit Plans Accumulated Other Comprehensive (Loss) (In thousands) Balance at beginning of period $ 9,313 $ (8,474 ) $ (69,574 ) $ (68,735 ) $ (13,226 ) $ (2,006 ) $ (56,665 ) $ (71,897 ) Effect of adoption of ASU 2016-01 — — — — (548 ) — — (548 ) Balance at January 1, 9,313 (8,474 ) (69,574 ) (68,735 ) (13,774 ) (2,006 ) (56,665 ) (72,445 ) Current period changes in other comprehensive income (loss) 19,562 (11,349 ) 857 9,070 9,405 (2,780 ) — 6,625 Total other comprehensive income (loss) $ 28,875 $ (19,823 ) $ (68,717 ) $ (59,665 ) $ (4,369 ) $ (4,786 ) $ (56,665 ) $ (65,820 ) The following tables reflect amounts reclassified from accumulated other comprehensive income (loss) to the Consolidated Statements of Income and the affected line item in the statement where net income is presented for the three months ended March 31, 2020 and 2019 : Accumulated Other Comprehensive Income (Loss) Components For the Three Months Ended March 31, Affected Line Items in the Consolidated Statements of Income 2020 2019 (In thousands) Reclassification adjustment for gains included in net income $ 370 $ 126 Gain on securities transactions Reclassification adjustment of actuarial net income included in net income 2,638 164 Other non-interest expense Total before tax 3,008 290 Income tax (benefit) (635 ) (60 ) Net of tax $ 2,373 $ 230

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities The Company uses derivative financial instruments as components of its market risk management, principally to manage interest rate risk. Certain derivatives are entered into in connection with transactions with commercial customers. Derivatives are not used for speculative purposes. All derivatives are recognized as either assets or liabilities in the Consolidated Statements of Financial Condition, reported at fair value and presented on a gross basis. Until a derivative is settled, a favorable change in fair value results in an unrealized gain that is recognized as an asset, while an unfavorable change in fair value results in an unrealized loss that is recognized as a liability. The Company generally applies hedge accounting to its derivatives used for market risk management purposes. Hedge accounting is permitted only if specific criteria are met, including a requirement that a highly effective relationship exists between the derivative instrument and the hedged item, both at inception of the hedge and on an ongoing basis. Changes in the fair value of effective fair value hedges are recognized in current earnings (with the change in fair value of the hedged asset or liability also recognized in earnings). Changes in the fair value of effective cash flow hedges are recognized in other comprehensive income (loss) until earnings are affected by the variability in cash flows of the designated hedged item. Ineffective portions of hedge results are recognized in current earnings. Changes in the fair value of derivatives for which hedge accounting is not applied are recognized in current earnings. The Company formally documents at inception all relationships between the derivative instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transactions. This process includes linking all derivatives that are designated as hedges to specific assets and liabilities, or to specific firm commitments. The Company also formally assesses, both at inception of the hedge and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in the fair values or cash flows of the hedged items. If it is determined that a derivative is not highly effective or has ceased to be a highly effective hedge, the Company would discontinue hedge accounting prospectively. Gains or losses resulting from the termination of a derivative accounted for as a cash flow hedge remain in other comprehensive income (loss) and is (accreted) amortized to earnings over the remaining period of the former hedging relationship. Certain derivative financial instruments are offered to certain commercial banking customers to manage their risk of exposure and risk management strategies. These derivative instruments consist primarily of currency forward contracts and interest rate swap contracts. The risk associated with these transactions is mitigated by simultaneously entering into similar transactions having essentially offsetting terms with a third party. In addition, the Company executes interest rate swaps with third parties in order to hedge the interest rate risk of short-term FHLB advances. Currency Forward Contracts. At March 31, 2020 and December 31, 2019 , the Company had no currency forward contracts in place with commercial banking customers. Interest Rate Swaps. At March 31, 2020 , the Company had interest rate swaps in place with 23 commercial banking customers executed by offsetting interest rate swaps with third parties, with an aggregated notional amount of $171.6 million . At December 31, 2019 , the Company had interest rate swaps in place with 22 commercial banking customers executed by offsetting interest rate swaps with third parties, with an aggregated notional amount of $169.9 million . These derivatives are not designated as hedges and are not speculative. These interest rate swaps do not meet hedge accounting requirements. At March 31, 2020 and December 31, 2019 , the Company had 34 and 29 interest rate swaps with notional amounts of $465.0 million and $410.0 million , respectively, hedging certain FHLB advances. These interest rate swaps meet the hedge accounting requirements. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counter-party in exchange for the Company making fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. For the three months ended March 31, 2020 and 2019 , the Company did not record any hedge ineffectiveness associated with these contracts. 16. Derivatives and Hedging Activities (continued) The tables below present the fair value of the Company’s derivative financial instruments as well as their classification in the Consolidated Statements of Financial Condition at March 31, 2020 and December 31, 2019 : March 31, 2020 Asset Derivative Liability Derivative Consolidated Statements of Financial Condition Fair Value Consolidated Statements of Financial Condition Fair Value (In thousands) Derivatives: Interest rate swaps Other Assets $ — Other Liabilities $ 26,194 Total derivative instruments $ — $ 26,194 December 31, 2019 Asset Derivative Liability Derivative Consolidated Statements of Financial Condition Fair Value Consolidated Statements of Financial Condition Fair Value (In thousands) Derivatives: Interest rate swaps Other Assets $ 185 Other Liabilities $ 11,546 Total derivative instruments $ 185 $ 11,546 For the three months ended March 31, 2020 and 2019 , losses of $426,000 and $67,000 , respectively, were recorded for changes in fair value of interest rate swaps with third parties. At March 31, 2020 and December 31, 2019 , accrued interest was $383,000 and $344,000 , respectively. The Company has agreements with counterparties that contain a provision that if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default of its derivative obligations. At March 31, 2020 , the termination value of derivatives in a net liability position, which includes accrued interest, was $26.6 million . The Company has collateral posting thresholds with certain of its derivative counterparties, and has posted collateral of $47.4 million

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition On January 1, 2019, the Company adopted ASU 2014-09 Revenue from Contracts with Customers (Topic 606) and all subsequent ASUs that modified Topic 606. The Company performed a review and assessment of all revenue streams, the related contracts with customers, and the underlying performance obligations in those contracts. This guidance does not apply to revenue associated with financial instruments, including interest income on loans and securities, which comprise the majority of the Company's revenue. Revenue-generating activities that are within the scope of Topic 606, are components of non-interest income. These revenue streams can generally be classified as demand deposit account fees, title insurance fees and other fees. The Company, using a modified retrospective transition approach, determined that there was no cumulative effect adjustment to retained earnings as a result of adopting the new standard, nor did the standard have a material impact on our consolidated financial statements including the timing or amounts of revenue recognized. 17. Revenue Recognition (continued) The following table presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the three months ended March 31, 2020 and 2019 . For the Three Months Ended March 31, 2020 2019 (In thousands) Non-interest income In-scope of Topic 606: Demand deposit account fees $ 1,299 $ 959 Title insurance fees 1,231 1,041 Other non-interest income 1,417 1,063 Total in-scope non-interest income 3,947 3,063 Total out-of-scope non-interest income 2,444 2,974 Total non-interest income $ 6,391 $ 6,037 Demand deposit account fees include monthly maintenance fees and service charges. These fees are generally derived as a result of either transaction-based or serviced-based services. The Company's performance obligation for these services is generally satisfied, and revenue recognized, at the time the transaction is completed or the service rendered. Fees for these services are generally received from the customer either at the time of the transaction or monthly. Title insurance fees are generally recognized at the time the transaction closes or when the service is rendered. Other non-interest income includes check printing fees, traveler's check fees, gift card fees, branch service fees, overdraft fees, account analysis fees, other deposit related fees, wealth management related fee income which includes annuity fees, brokerage commissions, and asset management fees. Wealth management related fee income represent fees earned from customers as consideration for asset management and investment advisory services provided by a third party. The Company's performance obligation is generally satisfied monthly and the resulting fees are recognized monthly based upon the month-end market value of the assets under management and the applicable fee rate. The Company does not earn performance-based incentives. The Company's performance obligation for these transaction-based services are generally satisfied, and related revenue recognized, at the time the transaction closes or when the service is rendered or a point in time when the service is completed. Also included in other fees are debit card and ATM fees which are transaction-based. Debit card revenue is primarily comprised of interchange fees earned when a customer's Company card is processed through a card payment network. ATM fees are largely generated when a Company cardholder uses a non-Company ATM, or a non-Company cardholder uses a Company ATM. The Company's performance obligation for these services is satisfied when the service is rendered. Payment is generally received at time of transaction or monthly. Out-of-scope non-interest income primarily consists of income from bank-owned life insurance, loan prepayment and servicing fees, net fees on loan level interest rate swaps, gains and losses on the sale of loans and securities, and changes in the fair value of equity securities. None of these revenue streams are subject to the requirements of Topic 606.

Acquisition of Roselle Bank

Acquisition of Roselle Bank	3 Months Ended
	Mar. 31, 2020
Business Combinations [Abstract]
Acquisition of Roselle Bank	Acquisition of Stewardship Financial Corporation On November 1, 2019, the Company completed its acquisition of Stewardship Financial Corporation ("Stewardship"), pursuant to the Agreement and Plan of Merger, dated as of June 6, 2019 (the "Merger Agreement"), by and among Columbia Financial, Broadway Acquisition Corp. (a wholly owned subsidiary of Columbia Financial) and Stewardship. Under the terms of the merger agreement, each outstanding share of Stewardship common stock was converted into the right to received $15.75 in cash at the effective time of the merger. At the time of closing, Stewardship had $956.0 million in total assets, including $756.9 million in net loans receivable, $52.6 million in securities, and $877.8 million in total liabilities, including $781.4 million in deposits and $81.8 million in borrowings. The deposits initially acquired from Stewardship were held across a network of 12 branches located in New Jersey throughout Bergen, Morris, and Passaic counties. During the three months ended March 31, 2020, four of these branches were closed, and the Bank recorded a loss of $770,000 related to these branch closures. Merger-related expenses are recorded in the Consolidated Statements of Income and are expensed as incurred. Direct acquisition and other charges incurred in connection with the Stewardship acquisition totaled $962,000 for the three months ended March 31, 2020. There were no merger expenses recorded for the three months ended March 31, 2019. On April 1, 2020, the Company completed its previously announced acquisition of RSB Bancorp, MHC, RSB Bancorp, Inc. and Roselle Bank (collectively, the "Roselle Entities"). Under the terms of the Merger Agreement, RSB Bancorp, MHC merged with and into Columbia Bank MHC, (the "MHC"), with the MHC as the surviving entity, RSB Bancorp, Inc. merged with and into the Company, with the Company as the surviving entity; and Roselle Bank merged with and into the Bank, with the Bank as the surviving institution. Under the terms of the merger agreement, effective April 1, 2020, depositors of Roselle Bank became depositors of the Bank and have the same rights and privileges in the MHC as if their accounts had been established at the Bank on the date established at Roselle Bank. At the effective time of the merger, the Company issued 4,759,048 shares of its common stock to the MHC, representing an amount equal to the fair value of the Roselle Entities as determined by an independent appraiser. 18. Acquisition of Roselle Entities (continued) Merger-related expenses which are recorded in the Consolidated Statements of Income and include costs relating to the Company's acquisition of the Roselle Entities represent one-time costs associated with acquisition activities and do not represent ongoing costs of the fully integrated combined organization. Accounting guidance requires that acquisition-related transactional and restructuring costs incurred by the Company be charged to expense as incurred. Direct acquisition and other charges incurred in connection with the Roselle acquisition totaled $112,000 for the three months ended March 31, 2020. Based on the closing date of April 1, 2020, the Company's unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q do not reflect the changes attributable to the Company's acquisition of the Roselle Entities.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has evaluated events subsequent to March 31, 2020 and through the financial statement issuance date of May 11, 2020 . See Note 18 regarding the Company's acquisition of the Roselle Entities on April 1, 2020. Other than as disclosed, the Company has not identified any material subsequent events that would require adjustment or disclosure in the consolidated financial statements. The COVID-19 pandemic has disrupted and adversely affected the Bank’s business and results of operations, and the ultimate impacts of the pandemic on the Bank’s business, financial condition and results of operations will depend on future developments and other factors that are highly uncertain and will be impacted by the scope and duration of the pandemic and actions taken by governmental authorities in response to the pandemic.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2020
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	Accounting Pronouncements Adopted in 2020 In October 2018, the FASB issued ASU No. 2018-16, Derivatives and Hedging (Topic 815)- Inclusion of the Secured Overnight Financing Rate ("SOFR") Overnight Index Swap ("OIS") Rate as a Benchmark Interest Rate for Hedge Accounting Purposes. This ASU permits the use of the OIS rate based upon SOFR as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815 in addition to the direct Treasury obligations of the U.S. Government, the LIBOR swap rate, the OIS rate based on the Fed Funds Effective Rate, and the Securities Industry and Financial Markets Association Municipal Swap Rate. The amendments in this ASU are required to be adopted concurrently with the amendments in ASU No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities, which was issued in August 2017. The effective date for this ASU for the Company is for fiscal years beginning after December 15, 2019, with early adoption, including adoption in an interim period permitted. The amendments should be adopted on a prospective basis for qualifying new of redesignated hedging relationships entered into on or after date of adoption. The Company adopted this guidance effective January 1, 2020. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements. 5. Summary of Significant Accounting Policies (continued) Accounting Pronouncements Adopted in 2020 (continued) In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement. The purpose of this updated guidance is to improve the effectiveness and disclosures in the notes to the financial statements . The ASU removes the requirement to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; removes the policy for timing of transfers between levels; and removes the disclosure related to the valuation process for Level 3 fair value measurements. The ASU also modifies existing disclosure requirements which relate to the disclosure for investments in certain entities which calculate net asset value and clarifies the disclosure about uncertainty in the measurements as of the reporting date. For all entities, the effective date for this guidance is fiscal years beginning after December 15, 2019, including interim periods within the reporting period, with early adoption permitted. Entities are also allowed to elect early adoption of the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. The Company adopted this guidance effective January 1, 2020. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. This guidance shortens the amortization period for premiums on callable debt securities by requiring that premiums be amortized to the first (or earliest) call date instead of as an adjustment to the yield over the contractual life. This change more closely aligns the accounting with the economics of a callable debt security and the amortization period with expectations that already are included in market pricing on callable debt securities. This guidance does not change the accounting for discounts on callable debt securities, which will continue to be amortized to the maturity date. This guidance includes only instruments that are held at a premium and have explicit call features. It does not include instruments that contain prepayment features, such as mortgage backed securities; nor does it include call options that are contingent upon future events or in which the timing or amount to be paid is not fixed. The effective date for this ASU for the Company is fiscal years beginning after December 15, 2019, including interim periods within the reporting period, with early adoption permitted. Transition is on a modified retrospective basis with an adjustment to retained earnings as of the beginning of the period of adoption. The Company adopted this guidance effective January 1, 2020. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The main objective of this guidance is to simplify the accounting for goodwill impairment by requiring that impairment charges be based upon the first step in the current two-step impairment test under ASC 350. Currently, if the fair value of a reporting unit is lower than its carrying amount (Step 1), an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount (Step 2). The implied fair value of goodwill is calculated by deducting the fair value of all assets and liabilities of the reporting unit from the reporting unit’s fair value as determined in Step 1. To determine the implied fair value of goodwill, entities estimate the fair value of any unrecognized intangible assets and any corporate-level assets or liabilities that were included in the determination of the carrying amount and fair value of the reporting unit in Step 1. Under this guidance, if a reporting unit’s carrying amount exceeds its fair value, an entity will record an impairment charge based on that difference. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. This guidance eliminates the requirement to calculate a goodwill impairment charge using Step 2. This guidance does not change the guidance on completing Step 1 of the goodwill impairment test. Under this guidance, an entity will still be able to perform the current optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The guidance in the ASU was applied prospectively and is effective for the Company for annual and interim impairment tests performed in periods beginning after December 15, 2019. The Company adopted this guidance effective January 1, 2020. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This guidance requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of the future minimum lease payments, at the lease commencement date for leases classified as operating leases as well as finance leases. The update also requires new quantitative disclosures related to leases in the Company's consolidated financial statements. There are also practical expedients in this update related to leases that commenced before the effective date, initial direct costs and the use of hindsight to extend or terminate a lease or purchase a leased asset. Lessor accounting remains largely unchanged under this new guidance. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842)-Land Easement Practical Expedient for Transition to Topic 842 , which provides an optional practical expedient to not evaluate land easements which were existing or expired before the adoption of Topic 842 that were not accounted for as leases under Topic 840. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases and ASU 2018-11, Leases (Topic 842) -Targeted Improvements which provides entities with an optional transition method under which comparative periods presented in the financial statements will continue to be in accordance with current Topic 840, Leases, and a practical expedient to not separate non-lease components from the associated lease component. The guidance is effective for the Company for annual periods beginning after 5. Summary of Significant Accounting Policies (continued) Accounting Pronouncements Adopted in 2020 (continued) December 15, 2019, including interim periods within that reporting period. In the evaluation of this guidance, the Company identified the inventory of leases and actively accumulated the requisite lease data necessary to apply the guidance. The Company selected a software platform to support the recording, accounting and disclosure requirements of the new lease guidance. Upon adoption, the Company recorded a right-of-use asset and lease liability as of January 1, 2020. See note 10 for more information regarding adoption. Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, Financial Instruments- Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("CECL") , further amended by ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments . Topic 326 pertains to the measurement of credit losses on financial instruments. This update requires the measurement of all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better determine their credit loss estimates. This update is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. This update is effective for financial statements issued for fiscal years and interim periods beginning after December 15, 2019. The Company elected to defer the adoption of the CECL methodology permitted by the recently enacted Coronavirus Aid, Relief and Economic Security Act ("CARES Act"). The Company will adopt CECL at the earlier of December 31, 2020 or when the national emergency concerning the COVID-19 outbreak has concluded. The Company will adopt the above mentioned ASUs related to Financial Instruments -Credit Losses (Topic 326) using a modified retrospective approach. Our CECL methodology includes the following key factors and assumptions for all loan portfolio segments: • a historical loss period, which represents a full economic credit cycle utilizing internal loss experience, as well as industry and peer historical loss data; • a single economic scenario with a reasonable and supportable forecast period of four to six quarters based on management’s current review of macroeconomic factors and the reliability of extended economic forecasts over different time horizons; • a reversion to historical mean period (after the reasonable and supportable forecast period) using a straight-line approach that extends through the shorter of six quarters or the end of the remaining contractual term; and • expected prepayment rates based on a combination of our historical experience and market observations. Based on several analyses performed, as well as an implementation analysis utilizing existing exposures and forecasts of macroeconomic conditions at March 31, 2020, we currently expect the adoption of ASU 2016-13 will result in an increase between 10% and 20% in our allowance for loan losses and our reserves for unfunded commitments. As part of the implementation of the ASU, the Company will reconcile historical loan data, determine segmentation of the loan portfolio for application of the CECL calculation, determine the key assumptions, select calculation methods, and establish an internal control framework. We are currently finalizing the execution of our implementation controls and enhancing process documentation. The expected increase in the allowance for loan losses and reserve for unfunded commitments is a result of the change from an incurred loss model, which encompasses allowances for current known and inherent losses within the portfolio, to an expected loss model, which encompasses allowances for losses expected to be incurred over the life of the portfolio. Furthermore, ASU 2016-13 will necessitate that we establish an allowance for expected credit losses for certain debt securities and other financial assets; however, we do not expect these allowances to be significant. Future amounts of provision expense related to our allowance for loan losses and reserves for unfunded commitments will depend on the size and composition of our loan portfolio, future economic conditions and borrowers’ payment performance. Future amounts of provision related our debt securities will depend on the composition of our securities portfolio and current market conditions. The adoption of ASU 2016-13 is not expected to have a significant impact on our regulatory capital ratios. Upon adoption, any impact to the allowance for credit losses, currently the allowance for loan losses, will have an offsetting impact on retained earnings. 5. Summary of Significant Accounting Policies (continued) Accounting Pronouncements Not Yet Adopted 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.

Earnings per Share (Tables)

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share calculations for the three months ended March 31, 2020 and 2019 : For the Three Months Ended March 31, 2020 2019 (Dollars in thousands, except per share data) Net income $ 6,765 $ 14,919 Shares: Weighted average shares outstanding - basic 108,438,173 111,536,577 Weighted average dilutive shares outstanding — — Weighted average shares outstanding - diluted 108,438,173 111,536,577 Earnings per share: Basic $ 0.06 $ 0.13 Diluted $ 0.06 $ 0.13

Debt Securities Available for_2

Debt Securities Available for Sale (Tables)	3 Months Ended
	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and the fair value of securities available-for-sale	D ebt securities available for sale at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 40,930 $ 1,283 $ — $ 42,213 Mortgage-backed securities and collateralized mortgage obligations 963,977 38,878 (817 ) 1,002,038 Municipal obligations 956 3 — 959 Corporate debt securities 68,606 563 (2,044 ) 67,125 Trust preferred securities 5,000 — (918 ) 4,082 $ 1,079,469 $ 40,727 $ (3,779 ) $ 1,116,417 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 42,081 $ 321 $ (16 ) $ 42,386 Mortgage-backed securities and collateralized mortgage obligations 968,165 12,981 (1,265 ) 979,881 Municipal obligations 2,284 1 (1 ) 2,284 Corporate debt securities 68,613 945 (378 ) 69,180 Trust preferred securities 5,000 — (395 ) 4,605 $ 1,086,143 $ 14,248 $ (2,055 ) $ 1,098,336
Schedule of securities by contractual maturity	The amortized cost and fair value of debt securities available for sale at March 31, 2020 , by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer. March 31, 2020 Amortized Cost Fair Value (In thousands) One year or less $ 31,476 $ 31,584 More than one year to five years 25,971 26,773 More than five years to ten years 52,572 51,555 More than ten years 5,473 4,467 $ 115,492 $ 114,379 Mortgage-backed securities and collateralized mortgage obligations 963,977 1,002,038 $ 1,079,469 $ 1,116,417 March 31, 2020 Amortized Cost Fair Value (In thousands) More than ten years 10,000 10,001 10,000 10,001 Mortgage-backed securities and collateralized mortgage obligations 263,152 276,570 $ 273,152 $ 286,571
Debt securities, available-for-sale, unrealized loss position, fair value	The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2020 and December 31, 2019 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2020 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ — $ — $ — $ — $ — $ — Mortgage-backed securities and collateralized mortgage obligations 50,819 (458 ) 41,392 (359 ) 92,211 (817 ) Municipal obligations — — — — — — Corporate debt securities 26,552 (1,036 ) 3,993 (1,008 ) 30,545 (2,044 ) Trust preferred securities — — 4,081 (918 ) 4,081 (918 ) $ 77,371 $ (1,494 ) $ 49,466 $ (2,285 ) $ 126,837 $ (3,779 ) 6. Debt Securities Available for Sale (continued) December 31, 2019 Less Than 12 Months 12 Months or Longer Total Fair Value — Gross Unrealized (Losses) — Fair Value — Gross Unrealized (Losses) — Fair Value — Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ 5,106 $ (13 ) $ 4,988 $ (3 ) $ 10,094 $ (16 ) Mortgage-backed securities and collateralized mortgage obligations 178,665 (946 ) 58,208 (319 ) 236,873 (1,265 ) Municipal obligations 696 (1 ) — — 696 (1 ) Corporate debt securities 2,588 (5 ) 4,627 (373 ) 7,215 (378 ) Trust preferred securities — — 4,605 (395 ) 4,605 (395 ) $ 187,055 $ (965 ) $ 72,428 $ (1,090 ) $ 259,483 $ (2,055 )

Debt Securities Held to Matur_2

Debt Securities Held to Maturity (Tables)	3 Months Ended
	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and the fair value of securities held-to-maturity	Debt securities held to maturity at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 10,000 $ 1 $ — $ 10,001 Mortgage-backed securities and collateralized mortgage obligations 263,152 13,431 (13 ) 276,570 $ 273,152 $ 13,432 $ (13 ) $ 286,571 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 20,000 $ 26 $ (66 ) $ 19,960 Mortgage-backed securities and collateralized mortgage obligations 265,756 4,048 (259 ) 269,545 $ 285,756 $ 4,074 $ (325 ) $ 289,505
Schedule of securities by contractual maturity	The amortized cost and fair value of debt securities available for sale at March 31, 2020 , by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer. March 31, 2020 Amortized Cost Fair Value (In thousands) One year or less $ 31,476 $ 31,584 More than one year to five years 25,971 26,773 More than five years to ten years 52,572 51,555 More than ten years 5,473 4,467 $ 115,492 $ 114,379 Mortgage-backed securities and collateralized mortgage obligations 963,977 1,002,038 $ 1,079,469 $ 1,116,417 March 31, 2020 Amortized Cost Fair Value (In thousands) More than ten years 10,000 10,001 10,000 10,001 Mortgage-backed securities and collateralized mortgage obligations 263,152 276,570 $ 273,152 $ 286,571
Schedule of held-to-maturity securities reported in a continuous unrealized loss position	The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2020 and December 31, 2019 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2020 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) Mortgage-backed securities and collateralized mortgage obligations 1,908 (13 ) — — 1,908 (13 ) $ 1,908 $ (13 ) $ — $ — $ 1,908 $ (13 ) December 31, 2019 Less Than 12 Months 12 Months or Longer Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) (In thousands) U.S. government and agency obligations $ 9,934 $ (66 ) $ — $ — $ 9,934 $ (66 ) Mortgage-backed securities and collateralized mortgage obligations 27,911 (251 ) 772 (8 ) 28,683 (259 ) $ 37,845 $ (317 ) $ 772 $ (8 ) $ 38,617 $ (325 )

Loans Receivable and Allowanc_2

Loans Receivable and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Schedule of loans receivable	Loans receivable at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, December 31, 2020 2019 (In thousands) Real estate loans: One-to-four family $ 2,071,941 $ 2,077,079 Multifamily and commercial 2,957,589 2,919,985 Construction 316,973 298,942 Commercial business loans 496,157 483,215 Consumer loans: Home equity loans and advances 379,700 388,127 Other consumer loans 1,739 1,960 Total gross loans 6,224,099 6,169,308 Purchased credit-impaired loans 7,021 7,021 Net deferred loan costs, fees and purchased premiums and discounts 21,385 21,237 Loans receivable $ 6,252,505 $ 6,197,566 The following table provides information with respect to our non-accrual loans, excluding PCI loans at March 31, 2020 and December 31, 2019 : March 31, December 31, 2020 2019 (In thousands) Non-accrual loans: Real estate loans: One-to-four family $ 3,201 $ 1,732 Multifamily and commercial 2,125 716 Commercial business loans 4,864 3,686 Consumer loans: Home equity loans and advances 473 553 Total non-accrual loans $ 10,663 $ 6,687
Schedule of aging of loans receivable by portfolio segment	The following tables summarize the aging of loans receivable by portfolio segment, excluding PCI loans at March 31, 2020 and December 31, 2019 : March 31, 2020 30-59 Days 60-89 Days 90 Days or More Total Past Due Current Total (In thousands) Real estate loans: One-to-four family $ 16,907 $ 2,747 $ 3,110 $ 22,764 $ 2,049,177 $ 2,071,941 Multifamily and commercial 3,671 — 2,125 5,796 2,951,793 2,957,589 Construction 2,405 — — 2,405 314,568 316,973 Commercial business loans 4,436 978 4,819 10,233 485,924 496,157 Consumer loans: Home equity loans and advances 3,939 420 223 4,582 375,118 379,700 Other consumer loans — — — — 1,739 1,739 Total loans $ 31,358 $ 4,145 $ 10,277 $ 45,780 $ 6,178,319 $ 6,224,099 December 31, 2019 30-59 Days 60-89 Days 90 Days or More Total Past Due Current Total (In thousands) Real estate loans: One-to-four family $ 6,249 $ 2,132 $ 1,638 $ 10,019 $ 2,067,060 $ 2,077,079 Multifamily and commercial 626 1,210 716 2,552 2,917,433 2,919,985 Construction — — — — 298,942 298,942 Commercial business loans 1,056 — 2,489 3,545 479,670 483,215 Consumer loans: Home equity loans and advances 1,708 246 405 2,359 385,768 388,127 Other consumer loans 3 — — 3 1,957 1,960 Total loans $ 9,642 $ 3,588 $ 5,248 $ 18,478 $ 6,150,830 $ 6,169,308
Schedule of PCI Loans Acquired	The following table presents changes in accretable yield for PCI loans for the three months ended March 31, 2020 . There were no PCI loans outstanding for the quarter ended March 31, 2019. For the Three Months Ended March 31, 2020 (In thousands) Balance at beginning of period $ 511 Accretion (49 ) Net change in expected cash flows 1 Balance at end of period $ 463
Schedule of loans receivable by portfolio segment and impairment method	The activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2020 and 2019 are as follows: For the Three Months Ended March 31, One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Unallocated Total (In thousands) 2020 Balance at beginning of period $ 13,780 $ 22,980 $ 7,435 $ 15,836 $ 1,669 $ 9 $ — $ 61,709 Provision charged (credited) 3,101 3,096 1,964 1,347 59 1 — 9,568 Recoveries 3 10 — 71 14 — — 98 Charge-offs (86 ) (1 ) — (63 ) (24 ) (1 ) — (175 ) Balance at end of period $ 16,798 $ 26,085 $ 9,399 $ 17,191 $ 1,718 $ 9 $ — $ 71,200 2019 Balance at beginning of period $ 15,232 $ 23,251 $ 7,217 $ 14,176 $ 2,458 $ 8 $ — $ 62,342 Provision charged (credited) 2,122 (2,265 ) 1,816 (1,996 ) 761 (2 ) — 436 Recoveries 21 — — 313 7 — — 341 Charge-offs — — — (268 ) (80 ) — — (348 ) Balance at end of period $ 17,375 $ 20,986 $ 9,033 $ 12,225 $ 3,146 $ 6 $ — $ 62,771 The following tables summarize loans receivable (including PCI loans) and allowance for loan losses by portfolio segment and impairment method at March 31, 2020 and December 31, 2019 : March 31, 2020 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Allowance for loan losses: Individually evaluated for impairment $ 468 $ 2 $ — $ 1,064 $ 17 $ — $ 1,551 Collectively evaluated for impairment 16,330 26,083 9,399 16,127 1,701 9 69,649 Loans acquired with deteriorated credit quality — — — — — — — Total $ 16,798 $ 26,085 $ 9,399 $ 17,191 $ 1,718 $ 9 $ 71,200 Total loans: Individually evaluated for impairment $ 8,483 $ 14,960 $ — $ 6,448 $ 2,117 $ — $ 32,008 Collectively evaluated for impairment 2,063,458 2,942,629 316,973 489,709 377,583 1,739 6,192,091 Loans acquired with deteriorated credit quality 372 4,963 — 1,686 — — 7,021 Total loans $ 2,072,313 $ 2,962,552 $ 316,973 $ 497,843 $ 379,700 $ 1,739 $ 6,231,120 December 31, 2019 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Allowance for loan losses: Individually evaluated for impairment $ 484 $ 2 $ — $ 1,121 $ 14 $ — $ 1,621 Collectively evaluated for impairment 13,296 22,978 7,435 14,715 1,655 9 60,088 Loans acquired with deteriorated credit quality — — — — — — — Total $ 13,780 $ 22,980 $ 7,435 $ 15,836 $ 1,669 $ 9 $ 61,709 Total loans: Individually evaluated for impairment $ 8,891 $ 2,599 $ — $ 5,178 $ 2,143 $ — $ 18,811 Collectively evaluated for impairment 2,068,188 2,917,386 298,942 478,037 385,984 1,960 6,150,497 Loans acquired with deteriorated credit quality 429 4,866 — 1,726 — — 7,021 Total loans $ 2,077,508 $ 2,924,851 $ 298,942 $ 484,941 $ 388,127 $ 1,960 $ 6,176,329
Schedule of troubled debt restructuring	The following table presents the number of loans modified as TDRs during the three months ended March 31, 2020 and 2019 , along with their balances immediately prior to the modification date and post-modification. Post-modification recorded investment represents the net book balance immediately following modification. For the Three Months Ended March 31, 2020 2019 No. of Loans Pre-modification Recorded Investment Post-modification Recorded Investment No. of Loans Pre-modification Recorded Investment Pre-modification Recorded Investment (Dollars in thousands) Troubled Debt Restructurings Real estate loans: Multifamily and commercial 1 10,212 11,507 1 4,095 4,095 Total restructured loans 1 $ 10,212 $ 11,507 1 $ 4,095 $ 4,095
Schedule of loans individually evaluated for impairment	The following tables present loans individually evaluated for impairment by loan segment, excluding PCI loans, at March 31, 2020 and December 31, 2019 : At March 31, 2020 Recorded Investment Unpaid Principal Balance Specific Allowance (In thousands) With no allowance recorded: Real estate loans: One-to-four family $ 3,857 $ 5,021 $ — Multifamily and commercial 13,862 14,601 — Commercial business loans 5,168 5,356 — Consumer loans: Home equity loans and advances 1,063 1,201 — 23,950 26,179 — With a specific allowance recorded: Real estate loans: One-to-four family 4,626 4,657 468 Multifamily and commercial 1,098 1,098 2 Commercial business loans 1,280 4,267 1,064 Consumer loans: Home equity loans and advances 1,054 1,054 17 8,058 11,076 1,551 Total: Real estate loans: One-to-four family 8,483 9,678 468 Multifamily and commercial 14,960 15,699 2 Commercial business loans 6,448 9,623 1,064 Consumer loans: Home equity loans and advances 2,117 2,255 17 Total loans $ 32,008 $ 37,255 $ 1,551 9. Loans Receivable and Allowance for Loan Losses (continued) At December 31, 2019 Recorded Investment Unpaid Principal Balance Specific Allowance (In thousands) With no allowance recorded: Real estate loans: One-to-four family $ 4,314 $ 5,473 $ — Multifamily and commercial 1,494 2,191 — Commercial business loans 3,859 4,048 — Consumer loans: Home equity loans and advances 1,080 1,217 — 10,747 12,929 — With a specific allowance recorded: Real estate loans: One-to-four family 4,577 4,613 484 Multifamily and commercial 1,105 1,105 2 Commercial business loans 1,319 4,307 1,121 Consumer loans: Home equity loans and advances 1,063 1,063 14 8,064 11,088 1,621 Total: Real estate loans: One-to-four family 8,891 10,086 484 Multifamily and commercial 2,599 3,296 2 Commercial business loans 5,178 8,355 1,121 Consumer loans: Home equity loans and advances 2,143 2,280 14 $ 18,811 $ 24,017 $ 1,621 The following tables present interest income recognized for loans individually evaluated for impairment, by loan segment, excluding PCI loans for the three months ended March 31, 2020 and 2019 : For the Three Months Ended March 31, 2020 2019 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (In thousands) Real estate loans: One-to-four family $ 8,688 $ 99 $ 8,807 $ 106 Multifamily and commercial 8,780 166 2,683 37 Construction — — 1,700 25 Commercial business loans 5,814 72 5,409 80 Consumer loans: Home equity loans and advances 2,130 30 2,847 52 Total loans $ 25,412 $ 367 $ 21,446 $ 300
Schedule of loans receivable by credit quality risk	The following tables present loans receivable by credit quality risk indicator and by loan segment, excluding PCI loans at March 31, 2020 and December 31, 2019 : March 31, 2020 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Pass $ 2,067,000 $ 2,936,799 $ 316,973 $ 468,205 $ 378,878 $ 1,739 $ 6,169,594 Special mention 414 4,343 — 16,264 — — 21,021 Substandard 4,527 16,447 — 11,688 822 — 33,484 Doubtful — — — — — — — Loss — — — — — — — Total $ 2,071,941 $ 2,957,589 $ 316,973 $ 496,157 $ 379,700 $ 1,739 $ 6,224,099 9. Loans Receivable and Allowance for Loan Losses (continued) December 31, 2019 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Pass $ 2,072,878 $ 2,900,286 $ 298,942 $ 454,183 $ 387,251 $ 1,960 $ 6,115,500 Special mention 419 4,724 — 20,170 — — 25,313 Substandard 3,782 14,975 — 8,862 876 — 28,495 Doubtful — — — — — — — Loss — — — — — — — Total $ 2,077,079 $ 2,919,985 $ 298,942 $ 483,215 $ 388,127 $ 1,960 $ 6,169,308

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Lessee, Operating Lease, Liability, Maturity	The following table summarizes lease payment obligations for each of the next five years and thereafter as follows: At March 31, 2020 Lease Payment Obligations (In thousands) 2020 $ 2,685 2021 3,407 2022 3,170 2023 2,941 2024 2,378 Thereafter 7,800 Total lease commitments $ 22,381

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2020
Banking and Thrift [Abstract]
Schedule of Deposits	Deposits at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, December 31, 2020 2019 (In thousands) Non-interest-bearing demand $ 1,039,303 $ 958,442 Interest-bearing demand 1,750,123 1,720,383 Money market accounts 423,171 410,392 Savings and club deposits 550,068 543,480 Certificates of deposit 2,009,753 2,013,145 Total deposits $ 5,772,418 $ 5,645,842
Schedule of Certificate Accounts by Maturity	Scheduled maturities of certificates of deposit accounts at March 31, 2020 and December 31, 2019 are summarized as follows: March 31, December 31, 2020 2019 (In thousands) One year or less $ 1,358,136 $ 1,293,613 After one year to two years 532,914 548,995 After two years to three years 86,956 142,458 After three years to four years 10,961 11,362 After four years 20,786 16,717 $ 2,009,753 $ 2,013,145

Stock Based Compensation (Table

Stock Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity	The following is a summary of the Company's restricted stock activity during the three months ended March 31, 2020 : Number of Restricted Shares Weighted Average Grant Date Fair Value Outstanding, January 1, 2020 1,420,012 $ 15.67 Granted — — Forfeited (881 ) 15.60 Outstanding, March 31, 2020 1,419,131 $ 15.67
Share-based Payment Arrangement, Option, Activity	The following is a summary of the Company's option activity for the three months ended March 31, 2020 : Number of Stock Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding, January 1, 2020 3,784,044 $ 15.67 9.6 $ 4,812,490 Granted — — — — Forfeited (9,707 ) 15.60 — — Outstanding, March 31, 2020 3,774,337 $ 15.67 9.3 $ 0 Options exercisable at March 31, 2020 — $ — — $ —

Components of Net Periodic Be_2

Components of Net Periodic Benefit Costs (Tables)	3 Months Ended
	Mar. 31, 2020
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	Net periodic benefit (income) cost for Pension Plan, RIM Plan, Post-retirement Plan and split-dollar life insurance arrangement plan benefits for the three months ended March 31, 2020 and 2019 , includes the following components: For the Three Months Ended March 31, Pension Plan RIM Plan Post-retirement Plan Split-Dollar Life Insurance 2020 2019 2020 2019 2020 2019 2020 2019 Affected Line Item in the Consolidated Statements of Income (In thousands) Service cost $ 1,937 $ 1,501 $ 67 $ 53 $ 99 $ 84 $ 106 $ 88 Compensation and employee benefits Interest cost 2,031 2,194 102 116 171 207 114 114 Other non-interest expense Expected return on plan assets (5,737 ) (4,727 ) — — — — — — Other non-interest expense Amortization: Prior service cost — — — — — — 14 14 Other non-interest expense Net loss 781 765 99 61 77 37 113 62 Other non-interest expense Net periodic (income) benefit cost $ (988 ) $ (267 ) $ 268 $ 230 $ 347 $ 328 $ 347 $ 278

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of fair value assets and liabilities measured on recurring basis	The following tables present the assets and liabilities reported on the Consolidated Statements of Financial Condition at their fair values as of March 31, 2020 and December 31, 2019 , by level within the fair value hierarchy: 14. Fair Value Measurements (continued) March 31, 2020 Fair Value Measurements Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Debt securities available for sale: U.S. government and agency obligations $ 42,213 $ 42,213 $ — $ — Mortgage-backed securities and collateralized mortgage obligations 1,002,038 — 1,002,038 — Municipal obligations 959 — 959 — Corporate debt securities 67,125 — 67,125 — Trust preferred securities 4,082 — 4,082 — Total debt securities available for sale 1,116,417 42,213 1,074,204 — Equity securities 2,271 2,018 253 — Derivative assets — — — — $ 1,118,688 $ 44,231 $ 1,074,457 $ — Derivative liabilities $ 26,194 $ — $ 26,194 $ — December 31, 2019 Fair Value Measurements Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Debt securities available for sale: U.S. government and agency obligations $ 42,386 $ 42,386 $ — $ — Mortgage-backed securities and collateralized mortgage obligations 979,881 — 979,881 — Municipal obligations 2,284 — 2,284 — Corporate debt securities 69,180 — 69,180 — Trust preferred securities 4,605 — 4,605 — Total debt securities available for sale 1,098,336 42,386 1,055,950 — Equity securities 2,855 2,587 268 Derivative assets 185 — 185 — $ 1,101,376 $ 44,973 $ 1,056,403 $ — Derivative liabilities $ 11,546 $ — $ 11,546 $ —
Schedule of fair value assets and liabilities measured on non-recurring basis	The following tables present the assets and liabilities reported on the Consolidated Statements of Financial Condition at their fair values as of March 31, 2020 and December 31, 2019 , by level within the fair value hierarchy: March 31, 2020 Fair Value Measurements Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Mortgage servicing rights $ 510 $ — $ — $ 510 $ 510 $ — $ — $ 510 December 31, 2019 Fair Value Measurements Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Impaired loans $ 1,063 $ — $ — $ 1,063 Mortgage servicing rights 681 — — 681 $ 1,744 $ — $ — $ 1,744
Schedule of qualitative information for Level 3 assets measured at fair value on a non-recurring basis	The following table presents information for Level 3 assets measured at fair value on a non-recurring basis as of March 31, 2020 and December 31, 2019 : March 31, 2020 Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Weighted Average (Dollars in thousands) Mortgage servicing rights $ 510 Estimated cash flow Prepayment speeds and discount rates (3) 8.1% - 31.4% 17.7% December 31, 2019 Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Weighted Average (Dollars in thousands) Impaired loans $ 1,063 Estimated cash flow Expected value of future cash flows (1) —% —% Mortgage servicing rights 681 Estimated cash flow Prepayment speeds and discount rates (2) 3.6% - 24.0% 12.7% (1) Value based on management's estimate of expected future cash flows. (2) Value of SBA servicing rights based on a discount rate of 11.75%. (3) Value of SBA servicing rights based on a discount rate of 10.25%.
Schedule of fair value assets and liabilities on Consolidated Balance Sheets	The following tables present the assets and liabilities reported on the Consolidated Statements of Financial Condition at their fair values as of March 31, 2020 and December 31, 2019 : March 31, 2020 Fair Value Measurements Carrying Value Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Financial assets: Cash and cash equivalents $ 88,324 $ 88,324 $ 88,324 $ — $ — Debt securities available for sale 1,116,417 1,116,417 42,213 1,074,204 — Debt securities held to maturity 273,152 286,571 10,001 276,570 — Equity securities 2,271 2,271 2,018 253 — Federal Home Loan Bank stock 68,233 68,233 — 68,233 — Loans receivable, net 6,181,305 6,087,507 — — 6,087,507 Financial liabilities: — Deposits $ 5,772,418 $ 5,795,732 $ — $ 5,795,732 $ — Borrowings 1,376,941 1,390,559 — 1,390,559 — Derivative liabilities 26,194 26,194 — 26,194 — December 31, 2019 Fair Value Measurements Carrying Value Total Fair Value Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) (In thousands) Financial assets: Cash and cash equivalents $ 75,547 $ 75,547 $ 75,547 $ — $ — Debt securities available for sale 1,098,336 1,098,336 42,386 1,055,950 — Debt securities held to maturity 285,756 289,505 19,960 269,545 — Equity securities 2,855 2,855 2,587 268 — Federal Home Loan Bank stock 69,579 69,579 — 69,579 — Loans receivable, net 6,135,857 6,219,008 — — 6,219,008 Derivative assets 185 185 — 185 — Financial liabilities: Deposits $ 5,645,842 $ 5,654,075 $ — $ 5,654,075 $ — Borrowings 1,407,022 1,411,962 — 1,411,962 — Derivative liabilities 11,546 11,546 — 11,546 —

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Schedule of Other Comprehensive Income (Loss)	The following tables present the components of other comprehensive income (loss), both gross and net of tax, for the three months ended March 31, 2020 and 2019 : For the Three Months Ended March 31, 2020 2019 Before Tax Tax Effect After Tax Before Tax Tax Effect After Tax (In thousands) Components of other comprehensive income (loss): Unrealized gains on debt securities available for sale: $ 24,383 $ (5,116 ) $ 19,267 $ 11,766 $ (2,471 ) $ 9,295 Accretion of unrealized gain on debt securities reclassified as held to maturity 8 (2 ) 6 13 (3 ) 10 Reclassification adjustment for gains included in net income 370 (81 ) 289 126 (26 ) 100 24,761 (5,199 ) 19,562 11,905 (2,500 ) 9,405 Derivatives: Unrealized (loss) on swap contracts accounted for as cash flow hedges (14,360 ) 3,011 (11,349 ) (3,520 ) 740 (2,780 ) (14,360 ) 3,011 (11,349 ) (3,520 ) 740 (2,780 ) Employee benefit plans: Amortization of prior service cost included in net income 42 (9 ) 33 (32 ) 7 (25 ) Reclassification adjustment of actuarial net gain included in net income 2,638 (554 ) 2,084 164 (34 ) 130 Change in funded status of retirement obligations (1,595 ) 335 (1,260 ) (132 ) 27 (105 ) 1,085 (228 ) 857 — — — Total other comprehensive income $ 11,486 $ (2,416 ) $ 9,070 $ 8,385 $ (1,760 ) $ 6,625
Components of Other Comprehensive Income (Loss)	The following tables present the changes in the components of accumulated other comprehensive income (loss), net of tax, for the three months ended March 31, 2020 and 2019 : For the Three Months Ended March 31, 2020 2019 Unrealized Gains on Debt Securities Available for Sale Unrealized (Losses) on Swaps Employee Benefit Plans Accumulated Other Comprehensive (Loss) Unrealized (Losses) on Debt Securities Available for Sale Unrealized Gains on Swaps Employee Benefit Plans Accumulated Other Comprehensive (Loss) (In thousands) Balance at beginning of period $ 9,313 $ (8,474 ) $ (69,574 ) $ (68,735 ) $ (13,226 ) $ (2,006 ) $ (56,665 ) $ (71,897 ) Effect of adoption of ASU 2016-01 — — — — (548 ) — — (548 ) Balance at January 1, 9,313 (8,474 ) (69,574 ) (68,735 ) (13,774 ) (2,006 ) (56,665 ) (72,445 ) Current period changes in other comprehensive income (loss) 19,562 (11,349 ) 857 9,070 9,405 (2,780 ) — 6,625 Total other comprehensive income (loss) $ 28,875 $ (19,823 ) $ (68,717 ) $ (59,665 ) $ (4,369 ) $ (4,786 ) $ (56,665 ) $ (65,820 )
Reclassification out of AOCI	The following tables reflect amounts reclassified from accumulated other comprehensive income (loss) to the Consolidated Statements of Income and the affected line item in the statement where net income is presented for the three months ended March 31, 2020 and 2019 : Accumulated Other Comprehensive Income (Loss) Components For the Three Months Ended March 31, Affected Line Items in the Consolidated Statements of Income 2020 2019 (In thousands) Reclassification adjustment for gains included in net income $ 370 $ 126 Gain on securities transactions Reclassification adjustment of actuarial net income included in net income 2,638 164 Other non-interest expense Total before tax 3,008 290 Income tax (benefit) (635 ) (60 ) Net of tax $ 2,373 $ 230

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of derivative financial instruments on the Consolidated Balance Sheets	The tables below present the fair value of the Company’s derivative financial instruments as well as their classification in the Consolidated Statements of Financial Condition at March 31, 2020 and December 31, 2019 : March 31, 2020 Asset Derivative Liability Derivative Consolidated Statements of Financial Condition Fair Value Consolidated Statements of Financial Condition Fair Value (In thousands) Derivatives: Interest rate swaps Other Assets $ — Other Liabilities $ 26,194 Total derivative instruments $ — $ 26,194 December 31, 2019 Asset Derivative Liability Derivative Consolidated Statements of Financial Condition Fair Value Consolidated Statements of Financial Condition Fair Value (In thousands) Derivatives: Interest rate swaps Other Assets $ 185 Other Liabilities $ 11,546 Total derivative instruments $ 185 $ 11,546

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the three months ended March 31, 2020 and 2019 . For the Three Months Ended March 31, 2020 2019 (In thousands) Non-interest income In-scope of Topic 606: Demand deposit account fees $ 1,299 $ 959 Title insurance fees 1,231 1,041 Other non-interest income 1,417 1,063 Total in-scope non-interest income 3,947 3,063 Total out-of-scope non-interest income 2,444 2,974 Total non-interest income $ 6,391 $ 6,037

Acquisition of Stewardship Fi_2

Acquisition of Stewardship Financial Corporation (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)branch	Dec. 31, 2019USD ($)	Nov. 01, 2019USD ($)branch$ / shares
Business Acquisition [Line Items]
Assets	$ 8,325,051	$ 8,188,694
Net loans receivable	6,181,305	6,135,857
Liabilities	7,363,925	7,206,177
Deposits	5,772,418	5,645,842
Borrowings	$ 1,376,941	1,407,022
Branch closures
Business Acquisition [Line Items]
Number of branches closed | branch	4
Loss on branch closures	$ 770
Stewardship Financial Corporation
Business Acquisition [Line Items]
Assets			$ 956,000
Net loans receivable			756,900
Securities			52,600
Liabilities			877,800
Deposits			781,400
Borrowings			$ 81,800
Number of stores | branch			12
Stewardship Financial Corporation
Business Acquisition [Line Items]
Business acquisition, share price (in dollars per share) | $ / shares			$ 15.75
Business acquisition, transaction costs		$ 962

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 6,765	$ 14,919
Shares:
Weighted average shares outstanding - basic (in shares)	108,438,173	111,536,577
Effect of dilutive common stock equivalents (in shares)	0	0
Weighted average shares outstanding - diluted (in shares)	108,438,173	111,536,577
Earnings per share:
Basic (in dollars per share)	$ 0.06	$ 0.13
Diluted (in dollars per share)	$ 0.06	$ 0.13
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	811,853	0

Stock Repurchase Program (Detai

Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 05, 2019	Jun. 13, 2019	Mar. 31, 2020	Mar. 31, 2019
Equity [Abstract]
Stock repurchase program, number of shares authorized to be repurchased (in shares)		4,000,000
Stock repurchase program, percent of common stock		3.50%
Stock repurchase program, number of additional shares authorized to be repurchased (in shares)	3,000,000
Shares repurchased, number of shares (in shares)			2,557,126	0
Shares repurchased, value			$ 40,363
Shares repurchased, price per share (in dollars per share)			$ 15.78

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Narrative (Details) - ASU 2016-13	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Dec. 31, 2020
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing receivable, allowance for credit loss, period increase (decrease), percent	20.00%
Forecast | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing receivable, allowance for credit loss, period increase (decrease), percent		10.00%

Debt Securities Available for_3

Debt Securities Available for Sale - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,079,469	$ 1,086,143
Gross Unrealized Gains	40,727	14,248
Gross Unrealized (Losses)	(3,779)	(2,055)
Debt securities available for sale, at fair value	1,116,417	1,098,336
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40,930	42,081
Gross Unrealized Gains	1,283	321
Gross Unrealized (Losses)	0	(16)
Debt securities available for sale, at fair value	42,213	42,386
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	963,977	968,165
Gross Unrealized Gains	38,878	12,981
Gross Unrealized (Losses)	(817)	(1,265)
Debt securities available for sale, at fair value	1,002,038	979,881
Municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	956	2,284
Gross Unrealized Gains	3	1
Gross Unrealized (Losses)	0	(1)
Debt securities available for sale, at fair value	959	2,284
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	68,606	68,613
Gross Unrealized Gains	563	945
Gross Unrealized (Losses)	(2,044)	(378)
Debt securities available for sale, at fair value	67,125	69,180
Trust preferred securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,000	5,000
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(918)	(395)
Debt securities available for sale, at fair value	$ 4,082	$ 4,605

Debt Securities Available for_4

Debt Securities Available for Sale - Expected Maturities of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost
Amortized Cost	$ 1,079,469	$ 1,086,143
Fair Value
Fair Value	1,116,417	1,098,336
Debt Securities excluding Mortgage-based securities and CMOs
Amortized Cost
One year or less	31,476
More than one year to five years	25,971
More than five years to ten years	52,572
More than ten years	5,473
Amortized Cost	115,492
Fair Value
One year or less	31,584
More than one year to five years	26,773
More than five years to ten years	51,555
More than ten years	4,467
Fair Value	114,379
Mortgage-backed securities and collateralized mortgage obligations
Amortized Cost
Amortized Cost	963,977	968,165
Fair Value
Fair Value	$ 1,002,038	$ 979,881

Debt Securities Available for_5

Debt Securities Available for Sale - Narrative (Details)	3 Months Ended
	Mar. 31, 2020USD ($)security	Mar. 31, 2019USD ($)security	Dec. 31, 2019USD ($)security
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,079,469,000		$ 1,086,143,000
Debt securities available for sale, at fair value	1,116,417,000		1,098,336,000
Proceeds from sales of debt securities available for sale	20,761,000	$ 0
Gross gains on sale of available-for-sale securities	369,000
Gross losses on sale of available-for-sale securities	0
Proceeds from calls of debt securities available for sale	1,100,000	$ 797,000
Calls of debt securities, available-for-sale, realized gain	1,000
Calls of debt securities, available-for-sale, unrealized loss	0
Sale and maturity of debt securities, available-for-sale	635,000
Number of debt securities called | security		1
Debt securities, available-for-sale, restricted	$ 649,400,000		$ 462,000,000
Number of securities in unrealized loss position | security	46		97
Other-than-temporary impairments charge on debt securities available for sale	$ 0	$ 0
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	963,977,000		$ 968,165,000
Debt securities available for sale, at fair value	$ 1,002,038,000		$ 979,881,000

Debt Securities Available for_6

Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 77,371	$ 187,055
Less than 12 months, gross unrealized (losses)	(1,494)	(965)
12 months or longer, fair value	49,466	72,428
12 months or longer, gross unrealized (losses)	(2,285)	(1,090)
Fair value	126,837	259,483
Gross unrealized (losses)	(3,779)	(2,055)
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	0	5,106
Less than 12 months, gross unrealized (losses)	0	(13)
12 months or longer, fair value	0	4,988
12 months or longer, gross unrealized (losses)	0	(3)
Fair value	0	10,094
Gross unrealized (losses)	0	(16)
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	50,819	178,665
Less than 12 months, gross unrealized (losses)	(458)	(946)
12 months or longer, fair value	41,392	58,208
12 months or longer, gross unrealized (losses)	(359)	(319)
Fair value	92,211	236,873
Gross unrealized (losses)	(817)	(1,265)
Municipal obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	0	696
Less than 12 months, gross unrealized (losses)	0	(1)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized (losses)	0	0
Fair value	0	696
Gross unrealized (losses)	0	(1)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	26,552	2,588
Less than 12 months, gross unrealized (losses)	(1,036)	(5)
12 months or longer, fair value	3,993	4,627
12 months or longer, gross unrealized (losses)	(1,008)	(373)
Fair value	30,545	7,215
Gross unrealized (losses)	(2,044)	(378)
Trust preferred securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	0	0
Less than 12 months, gross unrealized (losses)	0	0
12 months or longer, fair value	4,081	4,605
12 months or longer, gross unrealized (losses)	(918)	(395)
Fair value	4,081	4,605
Gross unrealized (losses)	$ (918)	$ (395)

Debt Securities Held to Matur_3

Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 273,152	$ 285,756
Gross unrealized gains	13,432	4,074
Gross unrealized (losses)	(13)	(325)
Fair value	286,571	289,505
U.S. government and agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	10,000	20,000
Gross unrealized gains	1	26
Gross unrealized (losses)	0	(66)
Fair value	10,001	19,960
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	263,152	265,756
Gross unrealized gains	13,431	4,048
Gross unrealized (losses)	(13)	(259)
Fair value	$ 276,570	$ 269,545

Debt Securities Held to Matur_4

Debt Securities Held to Maturity Expected Maturities of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost
Amortized cost	$ 273,152	$ 285,756
Fair Value
Fair value	286,571	289,505
U.S. government and agency obligations
Amortized Cost
More than ten years	10,000
Amortized cost	10,000	20,000
Fair Value
More than ten years	10,001
Fair value	10,001	19,960
Mortgage-backed securities and collateralized mortgage obligations
Amortized Cost
Amortized cost	263,152	265,756
Fair Value
Fair value	$ 276,570	$ 269,545

Debt Securities Held to Matur_5

Debt Securities Held to Maturity Narrative (Details)	3 Months Ended
	Mar. 31, 2020USD ($)security	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)security
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	$ 273,152,000		$ 285,756,000
Fair value	286,571,000		289,505,000
Proceeds from sale of held-to-maturity securities	$ 0
Debt securities, held-to-maturity, number of debt securities called | security	1
Proceeds from sale and maturity of held-to-maturity securities	$ 10,000,000	$ 0
Debt securities, held-to-maturity, sold, realized gain (loss)	0
Debt securities, held-to-maturity, sold, realized loss	0
Fair value of securities sold under agreements to repurchase	$ 239,200,000		$ 236,000,000
Number of positions | security	1		22
Other-than-temporary impairment loss, held-to-maturity, before tax	$ 0	$ 0
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	263,152,000		$ 265,756,000
Fair value	$ 276,570,000		$ 269,545,000

Debt Securities Held to Matur_6

Debt Securities Held to Maturity Continuous Unrealized Loss Position on Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	$ 1,908	$ 37,845
Less than 12 months, Gross unrealized (losses)	(13)	(317)
12 months or longer, Fair value	0	772
12 months or longer, Gross unrealized (losses)	0	(8)
Total, Fair value	1,908	38,617
Total, Gross unrealized (losses)	(13)	(325)
U.S. government and agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value		9,934
Less than 12 months, Gross unrealized (losses)		(66)
12 months or longer, Fair value		0
12 months or longer, Gross unrealized (losses)		0
Total, Fair value		9,934
Total, Gross unrealized (losses)		(66)
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	1,908	27,911
Less than 12 months, Gross unrealized (losses)	(13)	(251)
12 months or longer, Fair value	0	772
12 months or longer, Gross unrealized (losses)	0	(8)
Total, Fair value	1,908	28,683
Total, Gross unrealized (losses)	$ (13)	$ (259)

Equity Securities at Fair Val_2

Equity Securities at Fair Value (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jan. 01, 2019
Debt and Equity Securities, FV-NI [Line Items]
Equity securities	$ 2,271,000		$ 2,855,000
Cumulative effect of new accounting principle in period of adoption				$ 0
Change in fair value of equity securities	(584,000)	$ 176,000
Proceeds from sales of equity securities	$ 0	764,000
Equity securities, realized gain		126,000
Equity securities, realized loss		$ 0
Retained Earnings
Debt and Equity Securities, FV-NI [Line Items]
Cumulative effect of new accounting principle in period of adoption				548,000
Retained Earnings | Accounting Standards Update 2016-01
Debt and Equity Securities, FV-NI [Line Items]
Cumulative effect of new accounting principle in period of adoption				548,000
Accumulated Other Comprehensive (Loss)
Debt and Equity Securities, FV-NI [Line Items]
Cumulative effect of new accounting principle in period of adoption				(548,000)
Accumulated Other Comprehensive (Loss) | Accounting Standards Update 2016-01
Debt and Equity Securities, FV-NI [Line Items]
Cumulative effect of new accounting principle in period of adoption				$ (548,000)

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Loan Losses - Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 6,231,120	$ 6,176,329
Net deferred loan costs, fees and purchased premiums and discounts	21,385	21,237
Loans receivable	6,252,505	6,197,566
Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	2,072,313	2,077,508
Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	2,962,552	2,924,851
Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	316,973	298,942
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	497,843	484,941
Consumer loans | Home equity loans and advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	379,700	388,127
Consumer loans | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,739	1,960
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	6,224,099	6,169,308
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	2,071,941	2,077,079
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	2,957,589	2,919,985
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	316,973	298,942
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	496,157	483,215
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	379,700	388,127
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,739	1,960
Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	7,021	7,021
Loans receivable	7,000	7,000
Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	372	429
Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	4,963	4,866
Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	0	0
Financial Asset Acquired with Credit Deterioration | Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,686	1,726
Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	0	0
Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 0	$ 0

Loans Receivable and Allowanc_4

Loans Receivable and Allowance for Loan Losses - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020USD ($)loan	Mar. 31, 2019USD ($)loan	Dec. 31, 2019USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale	$ 0		$ 0
Gain on sale of loans held-for-investment	82,000
Loss on sale of loans held-for-investment	0
Purchases of loans receivable	0	$ 2,313,000
Carrying value of servicing liability	571,600,000		526,300,000
Proceeds from sales of loans receivable	$ 15,555,000	$ 9,311,000
Threshold period, past due status of financial receivables	30 days
Threshold period, past due for nonperforming status of financial receivables	90 days
Financing receivable, nonaccrual	$ 10,663,000		6,687,000
Financing receivable, 90 days or more past due, still accruing	0		0
Loans receivable	6,252,505,000		6,197,566,000
Real estate owned	$ 0		$ 0
Mortgage loans in process of foreclosure, number of loans | loan	1		4
Mortgage loans in process of foreclosure, amount	$ 180,000		$ 522,000
Specific allowance for loan losses attributable to impaired loans	1,551,000		1,621,000
Impaired loans for which there are no related allowance for loan losses	23,950,000		10,747,000
Financing receivable, modifications, recorded investment	$ 31,300,000		20,000,000
Number of loans | loan	1	1
Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of loans held-for-investment	$ 8,800,000
Gain on sale of loans held-for-investment		$ 70,000
Loss on sale of loans held-for-investment		0
Real estate loans | Home equity loans and advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of loans held-for-investment		$ 9,300,000
Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	2,125,000		716,000
Specific allowance for loan losses attributable to impaired loans	2,000		2,000
Impaired loans for which there are no related allowance for loan losses	$ 13,862,000		1,494,000
Number of loans | loan	1	1
Real estate loans | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale	$ 51,600,000	$ 8,100,000
Gain on sale of loans held-for-sale	672,000	62,000
Loss on sale of loans held-for-sale	0	0
Purchases of loans receivable		2,300,000
Financing receivable, nonaccrual	3,201,000		1,732,000
Specific allowance for loan losses attributable to impaired loans	468,000		484,000
Impaired loans for which there are no related allowance for loan losses	3,857,000		4,314,000
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of loans held-for-investment	$ 6,700,000
Number of loans held-for-investment | loan	1
Financing receivable, nonaccrual	$ 4,864,000		3,686,000
Specific allowance for loan losses attributable to impaired loans	1,064,000		1,121,000
Impaired loans for which there are no related allowance for loan losses	5,168,000		3,859,000
Less Than 90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 386,000		$ 1,500,000
Financial receivable, number of loans in nonaccrual status | loan	7		8
30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, recorded investment	$ 1,900,000		$ 660,000
Number of loans | loan	7		3
60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, recorded investment	$ 352,000
Number of loans | loan	1
90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, recorded investment	$ 1,200,000
Number of loans | loan	2		0
Freddie Mac
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans receivable	$ 0	$ 6,100,000
Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 7,000,000		$ 7,000,000

Loans Receivable and Allowanc_5

Loans Receivable and Allowance for Loan Losses - Aging of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total	$ 6,231,120	$ 6,176,329
Real estate loans | One-to-four family
Financing Receivable, Past Due [Line Items]
Total	2,072,313	2,077,508
Real estate loans | Multifamily and commercial
Financing Receivable, Past Due [Line Items]
Total	2,962,552	2,924,851
Real estate loans | Construction
Financing Receivable, Past Due [Line Items]
Total	316,973	298,942
Commercial business loans
Financing Receivable, Past Due [Line Items]
Total	497,843	484,941
Consumer loans | Home equity loans and advances
Financing Receivable, Past Due [Line Items]
Total	379,700	388,127
Consumer loans | Other consumer loans
Financing Receivable, Past Due [Line Items]
Total	1,739	1,960
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Past Due [Line Items]
Total Past Due	45,780	18,478
Current	6,178,319	6,150,830
Total	6,224,099	6,169,308
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	31,358	9,642
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	4,145	3,588
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 90 Days or More
Financing Receivable, Past Due [Line Items]
Total Past Due	10,277	5,248
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family
Financing Receivable, Past Due [Line Items]
Total Past Due	22,764	10,019
Current	2,049,177	2,067,060
Total	2,071,941	2,077,079
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	16,907	6,249
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family | 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	2,747	2,132
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family | 90 Days or More
Financing Receivable, Past Due [Line Items]
Total Past Due	3,110	1,638
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	5,796	2,552
Current	2,951,793	2,917,433
Total	2,957,589	2,919,985
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	3,671	626
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial | 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	0	1,210
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial | 90 Days or More
Financing Receivable, Past Due [Line Items]
Total Past Due	2,125	716
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	2,405	0
Current	314,568	298,942
Total	316,973	298,942
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	2,405	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | 90 Days or More
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans
Financing Receivable, Past Due [Line Items]
Total Past Due	10,233	3,545
Current	485,924	479,670
Total	496,157	483,215
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	4,436	1,056
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	978	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | 90 Days or More
Financing Receivable, Past Due [Line Items]
Total Past Due	4,819	2,489
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances
Financing Receivable, Past Due [Line Items]
Total Past Due	4,582	2,359
Current	375,118	385,768
Total	379,700	388,127
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	3,939	1,708
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances | 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	420	246
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances | 90 Days or More
Financing Receivable, Past Due [Line Items]
Total Past Due	223	405
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans
Financing Receivable, Past Due [Line Items]
Total Past Due	0	3
Current	1,739	1,957
Total	1,739	1,960
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	0	3
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans | 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans | 90 Days or More
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 0	$ 0

Loans Receivable and Allowanc_6

Loans Receivable and Allowance for Loan Losses - Accretable Yield For PCI Loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 511
Accretion	(49)
Net change in expected cash flows	1
Balance at end of period	$ 463

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Loan Losses - Non-accrual Status of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 10,663	$ 6,687
Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	3,201	1,732
Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	2,125	716
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	4,864	3,686
Consumer loans | Home equity loans and advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 473	$ 553

Loans Receivable and Allowanc_8

Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Allowance for loan losses:
Total	$ 71,200	$ 61,709	$ 62,771	$ 62,342
Total loans:
Total	6,231,120	6,176,329
Real estate loans | One-to-four family
Allowance for loan losses:
Total	16,798	13,780	17,375	15,232
Total loans:
Total	2,072,313	2,077,508
Real estate loans | Multifamily and commercial
Allowance for loan losses:
Total	26,085	22,980	20,986	23,251
Total loans:
Total	2,962,552	2,924,851
Real estate loans | Construction
Allowance for loan losses:
Total	9,399	7,435	9,033	7,217
Total loans:
Total	316,973	298,942
Commercial business loans
Allowance for loan losses:
Total	17,191	15,836	12,225	14,176
Total loans:
Total	497,843	484,941
Consumer loans | Home equity loans and advances
Allowance for loan losses:
Total	1,718	1,669	3,146	2,458
Total loans:
Total	379,700	388,127
Consumer loans | Other consumer loans
Allowance for loan losses:
Total	9	9	$ 6	$ 8
Total loans:
Total	1,739	1,960
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	1,551	1,621
Allowance for loan losses, Collectively evaluated for impairment	69,649	60,088
Total loans:
Total loans, individually evaluated for impairment	32,008	18,811
Total loans, collectively evaluated for impairment	6,192,091	6,150,497
Total	6,224,099	6,169,308
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	468	484
Allowance for loan losses, Collectively evaluated for impairment	16,330	13,296
Total loans:
Total loans, individually evaluated for impairment	8,483	8,891
Total loans, collectively evaluated for impairment	2,063,458	2,068,188
Total	2,071,941	2,077,079
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	2	2
Allowance for loan losses, Collectively evaluated for impairment	26,083	22,978
Total loans:
Total loans, individually evaluated for impairment	14,960	2,599
Total loans, collectively evaluated for impairment	2,942,629	2,917,386
Total	2,957,589	2,919,985
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	9,399	7,435
Total loans:
Total loans, individually evaluated for impairment	0	0
Total loans, collectively evaluated for impairment	316,973	298,942
Total	316,973	298,942
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	1,064	1,121
Allowance for loan losses, Collectively evaluated for impairment	16,127	14,715
Total loans:
Total loans, individually evaluated for impairment	6,448	5,178
Total loans, collectively evaluated for impairment	489,709	478,037
Total	496,157	483,215
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	17	14
Allowance for loan losses, Collectively evaluated for impairment	1,701	1,655
Total loans:
Total loans, individually evaluated for impairment	2,117	2,143
Total loans, collectively evaluated for impairment	377,583	385,984
Total	379,700	388,127
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	9	9
Total loans:
Total loans, individually evaluated for impairment	0	0
Total loans, collectively evaluated for impairment	1,739	1,960
Total	1,739	1,960
Financial Asset Acquired with Credit Deterioration
Allowance for loan losses:
Total	0	0
Total loans:
Total	7,021	7,021
Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family
Allowance for loan losses:
Total	0	0
Total loans:
Total	372	429
Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Allowance for loan losses:
Total	0	0
Total loans:
Total	4,963	4,866
Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction
Allowance for loan losses:
Total	0	0
Total loans:
Total	0	0
Financial Asset Acquired with Credit Deterioration | Commercial business loans
Allowance for loan losses:
Total	0	0
Total loans:
Total	1,686	1,726
Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances
Allowance for loan losses:
Total	0	0
Total loans:
Total	0	0
Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans
Allowance for loan losses:
Total	0	0
Total loans:
Total	$ 0	$ 0

Loans Receivable and Allowanc_9

Loans Receivable and Allowance for Loan Losses - Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)loan	Mar. 31, 2019USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
No. of Loans | loan	1	1
Pre-modification Recorded Investment	$ 10,212	$ 4,095
Post-modification Recorded Investment	$ 11,507	$ 4,095
Real estate loans | Multifamily and commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
No. of Loans | loan	1	1
Pre-modification Recorded Investment	$ 10,212	$ 4,095
Post-modification Recorded Investment	$ 11,507	$ 4,095

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Allowance for loan losses:
Beginning balance	$ 61,709	$ 62,342
Provision for loan losses	9,568	436
Recoveries	98	341
Charge-offs	(175)	(348)
Ending balance	71,200	62,771
Real estate loans | One-to-four family
Allowance for loan losses:
Beginning balance	13,780	15,232
Provision for loan losses	3,101	2,122
Recoveries	3	21
Charge-offs	(86)	0
Ending balance	16,798	17,375
Real estate loans | Multifamily and commercial
Allowance for loan losses:
Beginning balance	22,980	23,251
Provision for loan losses	3,096	(2,265)
Recoveries	10	0
Charge-offs	(1)	0
Ending balance	26,085	20,986
Real estate loans | Construction
Allowance for loan losses:
Beginning balance	7,435	7,217
Provision for loan losses	1,964	1,816
Recoveries	0	0
Charge-offs	0	0
Ending balance	9,399	9,033
Commercial business loans
Allowance for loan losses:
Beginning balance	15,836	14,176
Provision for loan losses	1,347	(1,996)
Recoveries	71	313
Charge-offs	(63)	(268)
Ending balance	17,191	12,225
Consumer loans | Home equity loans and advances
Allowance for loan losses:
Beginning balance	1,669	2,458
Provision for loan losses	59	761
Recoveries	14	7
Charge-offs	(24)	(80)
Ending balance	1,718	3,146
Consumer loans | Other consumer loans
Allowance for loan losses:
Beginning balance	9	8
Provision for loan losses	1	(2)
Recoveries	0	0
Charge-offs	(1)	0
Ending balance	9	6
Unallocated
Allowance for loan losses:
Beginning balance	0	0
Provision for loan losses	0	0
Recoveries	0	0
Charge-offs	0	0
Ending balance	$ 0	$ 0

Loans Receivable and Allowan_11

Loans Receivable and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	$ 23,950	$ 10,747
With no allowance recorded: Unpaid principal balance	26,179	12,929
With a specific allowance recorded: Recorded investment	8,058	8,064
With a specific allowance recorded: Unpaid principal balance	11,076	11,088
Recorded Investment	32,008	18,811
Unpaid Principal Balance	37,255	24,017
Specific Allowance	1,551	1,621
Real estate loans | One-to-four family
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	3,857	4,314
With no allowance recorded: Unpaid principal balance	5,021	5,473
With a specific allowance recorded: Recorded investment	4,626	4,577
With a specific allowance recorded: Unpaid principal balance	4,657	4,613
Recorded Investment	8,483	8,891
Unpaid Principal Balance	9,678	10,086
Specific Allowance	468	484
Real estate loans | Multifamily and commercial
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	13,862	1,494
With no allowance recorded: Unpaid principal balance	14,601	2,191
With a specific allowance recorded: Recorded investment	1,098	1,105
With a specific allowance recorded: Unpaid principal balance	1,098	1,105
Recorded Investment	14,960	2,599
Unpaid Principal Balance	15,699	3,296
Specific Allowance	2	2
Commercial business loans
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	5,168	3,859
With no allowance recorded: Unpaid principal balance	5,356	4,048
With a specific allowance recorded: Recorded investment	1,280	1,319
With a specific allowance recorded: Unpaid principal balance	4,267	4,307
Recorded Investment	6,448	5,178
Unpaid Principal Balance	9,623	8,355
Specific Allowance	1,064	1,121
Consumer loans | Home equity loans and advances
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	1,063	1,080
With no allowance recorded: Unpaid principal balance	1,201	1,217
With a specific allowance recorded: Recorded investment	1,054	1,063
With a specific allowance recorded: Unpaid principal balance	1,054	1,063
Recorded Investment	2,117	2,143
Unpaid Principal Balance	2,255	2,280
Specific Allowance	$ 17	$ 14

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Loan Losses - Interest Income on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 25,412	$ 21,446
Interest Income Recognized	367	300
Real estate loans | One-to-four family
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	8,688	8,807
Interest Income Recognized	99	106
Real estate loans | Multifamily and commercial
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	8,780	2,683
Interest Income Recognized	166	37
Real estate loans | Construction
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	1,700
Interest Income Recognized	0	25
Commercial business loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	5,814	5,409
Interest Income Recognized	72	80
Consumer loans | Home equity loans and advances
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	2,130	2,847
Interest Income Recognized	$ 30	$ 52

Loans Receivable and Allowan_13

Loans Receivable and Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	$ 6,231,120	$ 6,176,329
Real estate loans | One-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	2,072,313	2,077,508
Real estate loans | Multifamily and commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	2,962,552	2,924,851
Real estate loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	316,973	298,942
Commercial business loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	497,843	484,941
Consumer loans | Home equity loans and advances
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	379,700	388,127
Consumer loans | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	1,739	1,960
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	6,224,099	6,169,308
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	6,169,594	6,115,500
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	21,021	25,313
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	33,484	28,495
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	2,071,941	2,077,079
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	2,067,000	2,072,878
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	414	419
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	4,527	3,782
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	2,957,589	2,919,985
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	2,936,799	2,900,286
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	4,343	4,724
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	16,447	14,975
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	316,973	298,942
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	316,973	298,942
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	496,157	483,215
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	468,205	454,183
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	16,264	20,170
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	11,688	8,862
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	379,700	388,127
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	378,878	387,251
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	822	876
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	1,739	1,960
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	1,739	1,960
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	$ 0	$ 0

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease, weighted average remaining lease term	8 years
Operating lease, weighted average discount rate	2.28%
Lease, cost	$ 694
Operating lease commitments due, next twelve months			$ 4,900
Operating lease commitments due, 2021			4,500
Operating lease commitments due, 2022			4,000
Operating lease commitments due, 2023			3,500
Operating lease commitments due, 2024			2,700
Operating lease commitments due thereafter			$ 5,000
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term	5 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term	10 years
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease, right-of-use asset		$ 22,200
Operating lease, liability		$ 23,300

Leases - Operating Lease Paymen

Leases - Operating Lease Payment Obligations (Details) $ in Thousands	Mar. 31, 2020USD ($)
Leases [Abstract]
2020	$ 2,685
2021	3,407
2022	3,170
2023	2,941
2024	2,378
Thereafter	7,800
Total lease commitments	$ 22,381

Deposits - Schedule of Deposits

Deposits - Schedule of Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Banking and Thrift [Abstract]
Non-interest-bearing demand	$ 1,039,303	$ 958,442
Interest-bearing demand	1,750,123	1,720,383
Money market accounts	423,171	410,392
Savings and club deposits	550,068	543,480
Certificates of deposit	2,009,753	2,013,145
Total deposits	$ 5,772,418	$ 5,645,842

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Interest-bearing demand	$ 1,750,123		$ 1,720,383
Aggregate amount of certificates of deposit exceeding threshold amount	1,100,000		1,100,000
Interest expense on deposits	16,832	$ 13,679
Stewardship Financial Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Interest-bearing demand	$ 26,500		$ 31,600

Deposits - Schedule of Deposit

Deposits - Schedule of Deposit Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Banking and Thrift [Abstract]
One year or less	$ 1,358,136	$ 1,293,613
After one year to two years	532,914	548,995
After two years to three years	86,956	142,458
After three years to four years	10,961	11,362
After four years	20,786	16,717
Total term certificate accounts	$ 2,009,753	$ 2,013,145

Stock Based Compensation - Narr

Stock Based Compensation - Narrative (Details) - USD ($)	Dec. 16, 2019	Jul. 23, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jun. 06, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)						7,949,996
Document Period End Date			Mar. 31, 2020
Granted (in shares)	184,378	3,589,959	0
Grants in period (in dollars per share)	$ 4.59	$ 4.25
Granted (in dollars per share)	$ 17	$ 15.60	$ 0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)						2,271,427
Granted (in shares)	74,673	1,419,131	0
Granted (in dollars per share)	$ 17	$ 15.60	$ 0
Stock based compensation			$ 1,400,000	$ 0
Non-vested restricted shares outstanding (in shares)			1,419,131		1,420,012
Non-vested restricted shares outstanding, amount			$ 18,500,000
Period for recognition (in years)			4 years 3 months 18 days
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		5 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)						5,678,569
Award vesting period (in years)	5 years	5 years
Stock based compensation			$ 798,500	$ 0
Non-vested restricted shares outstanding (in shares)			3,774,337
Non-vested restricted shares outstanding, amount			$ 14,000,000
Period for recognition (in years)			4 years 3 months 18 days
Expiration period (in years)	10 years	10 years
Expected term	6 years 6 months	6 years 6 months
Risk free interest rate	1.79%	1.90%
Expected volatility rate	22.23%	22.12%
Expected dividend rate	0.00%	0.00%
Tranche One | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		1 year
Tranche One | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	1 year

Stock Based Compensation - Rest

Stock Based Compensation - Restricted Stock Activity (Details) - Restricted Stock - $ / shares	Dec. 16, 2019	Jul. 23, 2019	Mar. 31, 2020
Number of Restricted Shares
Beginning balance (in shares)			1,420,012
Granted (in shares)	74,673	1,419,131	0
Forfeited (in shares)			(881)
Ending balance (in shares)			1,419,131
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)			$ 15.67
Granted (in dollars per share)	$ 17	$ 15.60	0
Forfeited (in dollars per share)			15.60
Ending balance (in dollars per share)			$ 15.67

Stock Based Compensation - Stoc

Stock Based Compensation - Stock Option Activity (Details) - USD ($)	Dec. 16, 2019	Jul. 23, 2019	Mar. 31, 2020	Dec. 31, 2019
Number of Stock Options
Beginning balance (in shares)			3,784,044
Granted (in shares)	184,378	3,589,959	0
Forfeited (in shares)			(9,707)
Ending balance (in shares)			3,774,337	3,784,044
Options exercisable (in shares)			0
Weighted Average Exercise Price
Beginning balance (in dollars per share)			$ 15.67
Granted (in dollars per share)	$ 17	$ 15.60	0
Forfeited (in dollars per share)			15.60
Ending balance (in dollars per share)			15.67	$ 15.67
Options exercisable (in dollars per share)			$ 0
Weighted Average Remaining Contractual Term (in years)
Options outstanding			9 years 3 months 18 days	9 years 7 months 6 days
Aggregate Intrinsic Value
Options outstanding			$ 0	$ 4,812,490

Components of Net Periodic Be_3

Components of Net Periodic Benefit Costs (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Retirement Benefits [Abstract]
Years of employment benefits are based upon	5 years
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer contribution amount	$ 0
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,937,000	$ 1,501,000
Interest cost	2,031,000	2,194,000
Expected return on plan assets	(5,737,000)	(4,727,000)
Amortization of Prior service cost	0	0
Amortization of Net loss	781,000	765,000
Net periodic (income) benefit cost	(988,000)	(267,000)
RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	67,000	53,000
Interest cost	102,000	116,000
Expected return on plan assets	0	0
Amortization of Prior service cost	0	0
Amortization of Net loss	99,000	61,000
Net periodic (income) benefit cost	268,000	230,000
Post-retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	99,000	84,000
Interest cost	171,000	207,000
Expected return on plan assets	0	0
Amortization of Prior service cost	0	0
Amortization of Net loss	77,000	37,000
Net periodic (income) benefit cost	347,000	328,000
Split-Dollar Life Insurance
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	106,000	88,000
Interest cost	114,000	114,000
Expected return on plan assets	0	0
Amortization of Prior service cost	14,000	14,000
Amortization of Net loss	113,000	62,000
Net periodic (income) benefit cost	$ 347,000	$ 278,000

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	$ 1,116,417	$ 1,098,336
Equity securities	2,271	2,855
U.S. government and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	42,213	42,386
Mortgage-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	1,002,038	979,881
Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	959	2,284
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	67,125	69,180
Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	4,082	4,605
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	42,213	42,386
Equity securities	2,018	2,587
Derivative assets		0
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	1,074,204	1,055,950
Equity securities	253	268
Derivative assets		185
Derivative liabilities	26,194	11,546
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Equity securities	0	0
Derivative assets		0
Derivative liabilities	0	0
Measured on recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	1,116,417	1,098,336
Equity securities	2,271	2,855
Derivative assets	0	185
Assets	1,118,688	1,101,376
Derivative liabilities	26,194	11,546
Measured on recurring basis | U.S. government and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	42,213	42,386
Measured on recurring basis | Mortgage-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	1,002,038	979,881
Measured on recurring basis | Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	959	2,284
Measured on recurring basis | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	67,125	69,180
Measured on recurring basis | Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	4,082	4,605
Measured on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	42,213	42,386
Equity securities	2,018	2,587
Derivative assets	0	0
Assets	44,231	44,973
Derivative liabilities	0	0
Measured on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	42,213	42,386
Measured on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Measured on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Measured on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Measured on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Measured on recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	1,074,204	1,055,950
Equity securities	253	268
Derivative assets	0	185
Assets	1,074,457	1,056,403
Derivative liabilities	26,194	11,546
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | U.S. government and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	1,002,038	979,881
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	959	2,284
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	67,125	69,180
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	4,082	4,605
Measured on recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Equity securities	0
Derivative assets	0	0
Assets	0	0
Derivative liabilities	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | U.S. government and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	$ 0	$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details)	3 Months Ended
	Mar. 31, 2020
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustments for estimated costs to sell collateral dependent impaired loans	6.00%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustments for estimated costs to sell collateral dependent impaired loans	8.00%

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets and Liabilities Measured on Non-Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured for impairment based on the fair value of the underlying collateral	$ 0	$ 0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured for impairment based on the fair value of the underlying collateral	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured for impairment based on the fair value of the underlying collateral	6,087,507	6,219,008
Measured on non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured for impairment based on the fair value of the underlying collateral		1,063
Mortgage servicing rights	510	681
Assets	510	1,744
Measured on non-recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured for impairment based on the fair value of the underlying collateral		0
Mortgage servicing rights	0	0
Assets	0	0
Measured on non-recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured for impairment based on the fair value of the underlying collateral		0
Mortgage servicing rights	0	0
Assets	0	0
Measured on non-recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured for impairment based on the fair value of the underlying collateral		1,063
Mortgage servicing rights	510	681
Assets	$ 510	$ 1,744

Fair Value Measurements - Quali

Fair Value Measurements - Qualitative Valuation (Details) $ in Thousands	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Measured on non-recurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Mortgage servicing rights	$ 510	$ 681
Loans measured for impairment based on the fair value of the underlying collateral		1,063
Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Loans measured for impairment based on the fair value of the underlying collateral	6,087,507	6,219,008
Significant Unobservable Inputs (Level 3) | Measured on non-recurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Mortgage servicing rights	$ 510	681
Loans measured for impairment based on the fair value of the underlying collateral		$ 1,063
Significant Unobservable Inputs (Level 3) | Discount Rate | Measured on non-recurring basis | Estimated Cash Flow
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired financing receivable, measurement input		0
Significant Unobservable Inputs (Level 3) | Discount Rate | Measured on non-recurring basis | Weighted Average | Estimated Cash Flow
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired financing receivable, measurement input		0
Servicing asset, measurement input	0.1025	0.1175
Significant Unobservable Inputs (Level 3) | Prepayment Speeds and Discounts Rates | Measured on non-recurring basis | Minimum | Estimated Cash Flow
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing asset, measurement input	0.081	0.036
Significant Unobservable Inputs (Level 3) | Prepayment Speeds and Discounts Rates | Measured on non-recurring basis | Maximum | Estimated Cash Flow
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing asset, measurement input	0.314	0.240
Significant Unobservable Inputs (Level 3) | Prepayment Speeds and Discounts Rates | Measured on non-recurring basis | Weighted Average | Estimated Cash Flow
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing asset, measurement input	0.177	0.127

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value on Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financial assets:
Debt securities available for sale, at fair value	$ 1,116,417	$ 1,098,336
Debt securities held to maturity	286,571	289,505
Equity securities	2,271	2,855
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	88,324	75,547
Debt securities available for sale, at fair value	42,213	42,386
Debt securities held to maturity	10,001	19,960
Equity securities	2,018	2,587
Federal Home Loan Bank stock	0	0
Loans receivable, net	0	0
Derivative assets		0
Financial liabilities:
Deposits	0	0
Borrowings	0	0
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Debt securities available for sale, at fair value	1,074,204	1,055,950
Debt securities held to maturity	276,570	269,545
Equity securities	253	268
Federal Home Loan Bank stock	68,233	69,579
Loans receivable, net	0	0
Derivative assets		185
Financial liabilities:
Deposits	5,795,732	5,654,075
Borrowings	1,390,559	1,411,962
Derivative liabilities	26,194	11,546
Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Debt securities available for sale, at fair value	0	0
Debt securities held to maturity	0	0
Equity securities	0	0
Federal Home Loan Bank stock	0	0
Loans receivable, net	6,087,507	6,219,008
Derivative assets		0
Financial liabilities:
Deposits	0	0
Borrowings	0	0
Derivative liabilities	0	0
Carrying Value
Financial assets:
Cash and cash equivalents	88,324	75,547
Debt securities available for sale, at fair value	1,116,417	1,098,336
Debt securities held to maturity	273,152	285,756
Equity securities	2,271	2,855
Federal Home Loan Bank stock	68,233	69,579
Loans receivable, net	6,181,305	6,135,857
Derivative assets	0	185
Financial liabilities:
Deposits	5,772,418	5,645,842
Borrowings	1,376,941	1,407,022
Derivative liabilities	26,194	11,546
Total Fair Value
Financial assets:
Cash and cash equivalents	88,324	75,547
Debt securities available for sale, at fair value	1,116,417	1,098,336
Debt securities held to maturity	286,571	289,505
Equity securities	2,271	2,855
Federal Home Loan Bank stock	68,233	69,579
Loans receivable, net	6,087,507	6,219,008
Derivative assets		185
Financial liabilities:
Deposits	5,795,732	5,654,075
Borrowings	1,390,559	1,411,962
Derivative liabilities	$ 26,194	$ 11,546

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) - Tax effects of components in other comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Before Tax
Other comprehensive income (loss)	$ 11,486	$ 8,385
Tax Effect
Other comprehensive income (loss)	(2,416)	(1,760)
After Tax
Other comprehensive income (loss)	9,070	6,625
Unrealized Gains on Debt Securities Available for Sale
Before Tax
Other comprehensive income (loss), before reclassifications	24,383	11,766
Other comprehensive income (loss)	24,761	11,905
Tax Effect
Other comprehensive income (loss), before reclassifications	(5,116)	(2,471)
Other comprehensive income (loss)	(5,199)	(2,500)
After Tax
Other comprehensive income (loss), before reclassifications	19,267	9,295
Other comprehensive income (loss)	19,562	9,405
AOCI, Accumulated Gain (Loss), Debt Securities Available-for-sale, Accretion Of Unrealized Gains (Losses), Parent
Before Tax
Reclassification from AOCI, current period	8	13
Tax Effect
Reclassification from AOCI, current period	(2)	(3)
After Tax
Reclassification from AOCI, current period	6	10
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Other Reclassifications, Parent
Before Tax
Reclassification from AOCI, current period	370	126
Tax Effect
Reclassification from AOCI, current period	(81)	(26)
After Tax
Reclassification from AOCI, current period	289	100
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Before Tax
Other comprehensive income (loss), before reclassifications	(14,360)	(3,520)
Tax Effect
Other comprehensive income (loss), before reclassifications	3,011	740
After Tax
Other comprehensive income (loss), before reclassifications	(11,349)	(2,780)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Before Tax
Reclassification from AOCI, current period	42	(32)
Tax Effect
Reclassification from AOCI, current period	(9)	7
After Tax
Reclassification from AOCI, current period	33	(25)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Before Tax
Reclassification from AOCI, current period	2,638	164
Tax Effect
Reclassification from AOCI, current period	(554)	(34)
After Tax
Reclassification from AOCI, current period	2,084	130
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Before Tax
Other comprehensive income (loss), before reclassifications	(1,595)	(132)
Other comprehensive income (loss)	1,085	0
Tax Effect
Other comprehensive income (loss), before reclassifications	335	27
Other comprehensive income (loss)	(228)	0
After Tax
Other comprehensive income (loss), before reclassifications	(1,260)	(105)
Other comprehensive income (loss)	$ 857	$ 0

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) - Changes in components of other comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2020	Jan. 01, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 982,517	$ 972,060
Cumulative effect of new accounting principle in period of adoption				$ 0
Balance, as adjusted				972,060
Current period changes in other comprehensive income (loss)	9,070	6,625
Balance at end of year	961,126	994,502
Accumulated Other Comprehensive (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(68,735)	(71,897)
Cumulative effect of new accounting principle in period of adoption				(548)
Balance, as adjusted			$ (68,735)	(72,445)
Current period changes in other comprehensive income (loss)	9,070	6,625
Balance at end of year	(59,665)	(65,820)
Unrealized Gains on Debt Securities Available for Sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	9,313	(13,226)
Cumulative effect of new accounting principle in period of adoption				(548)
Balance, as adjusted			9,313	(13,774)
Current period changes in other comprehensive income (loss)	19,562	9,405
Balance at end of year	28,875	(4,369)
Unrealized (Losses) on Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(8,474)	(2,006)
Balance, as adjusted			(8,474)	(2,006)
Current period changes in other comprehensive income (loss)	(11,349)	(2,780)
Balance at end of year	(19,823)	(4,786)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(69,574)	(56,665)
Balance, as adjusted			$ (69,574)	$ (56,665)
Current period changes in other comprehensive income (loss)	857	0
Balance at end of year	$ (68,717)	$ (56,665)

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain on securities transactions	$ 370	$ 126
Other non-interest expense	4,788	2,450
Income before income tax expense	9,017	18,426
Income tax (benefit)	(2,252)	(3,507)
Net of tax	6,765	14,919
Accumulated Other Comprehensive Income (Loss) Components
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income before income tax expense	3,008	290
Income tax (benefit)	(635)	(60)
Net of tax	2,373	230
Accumulated Other Comprehensive Income (Loss) Components | Reclassification adjustment for gains included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain on securities transactions	370	126
Accumulated Other Comprehensive Income (Loss) Components | Reclassification adjustment of actuarial net income included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-interest expense	$ 2,638	$ 164

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Narrative (Details)	3 Months Ended
	Mar. 31, 2020USD ($)swap	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)swap
Derivative [Line Items]
Accrued interest on derivatives, at fair value	$ 383,000		$ 344,000
Derivative, net liability position, aggregate fair value	26,600,000
Derivative, collateral, right to reclaim cash	47,400,000
Interest Rate Swap
Derivative [Line Items]
Derivative gain (loss) on derivative, net	426,000	$ 67,000
Not-designated hedge | Currency forward contract - non-designated hedge
Derivative [Line Items]
Notional amount of derivative	0		0
Not-designated hedge | Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative	$ 171,600,000		$ 169,900,000
Number of commercial banking customers | swap	23		22
Federal Home Loan Bank Advances | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative	$ 465,000,000		$ 410,000,000
Number of interest rate derivatives held | swap	34		29

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Interest rate swaps | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 0	$ 185
Interest rate swaps | Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	26,194	11,546
Reported Value Measurement
Derivatives, Fair Value [Line Items]
Derivative assets	0	185
Derivative liabilities	$ 26,194	$ 11,546

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total out-of-scope non-interest income	$ 2,444	$ 2,974
Total non-interest income	6,391	6,037
Deposit Account, Title Insurance and Other Non-Interest Income
Disaggregation of Revenue [Line Items]
Revenue	3,947	3,063
Demand deposit account fees
Disaggregation of Revenue [Line Items]
Revenue	1,299	959
Title insurance fees
Disaggregation of Revenue [Line Items]
Revenue	1,231	1,041
Other non-interest income
Disaggregation of Revenue [Line Items]
Revenue	$ 1,417	$ 1,063

Acquisition of Roselle Bank (De

Acquisition of Roselle Bank (Details) - USD ($) $ in Thousands	Apr. 01, 2020	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Merger-related expenses		$ 1,075	$ 0
Roselle Entities
Business Acquisition [Line Items]
Merger-related expenses		$ 112
Subsequent Event | Roselle Entities
Business Acquisition [Line Items]
Business acquisition, equity interest issued or issuable (in shares)	4,759,048

Uncategorized Items - a10q33120

Label	Element	Value
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 560,764,000
Treasury Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	0
Common Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	1,159,000
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	527,037,000
Unallocated Common Stock Held By The Employee Stock Ownership Plan [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	(43,835,000)
Stock Held by Rabbi Trust [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	(1,259,000)
Deferred Compensation Obligation [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 639,000