Columbia Financial (CLBK) 10-Q 10 May 21 2021 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	May 06, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
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)		108,610,755
Entity Central Index Key	0001723596
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period	Q1
Amendment Flag	false

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 359,532	$ 422,787
Short-term investments	184	170
Total cash and cash equivalents	359,716	422,957
Debt securities available for sale, at fair value	1,474,246	1,316,952
Debt securities held to maturity, at amortized cost (fair value of $398,906 and $277,091 at March 31, 2021 and December 31, 2020, respectively)	391,264	262,720
Equity securities, at fair value	4,830	5,418
Federal Home Loan Bank stock	40,280	43,759
Loans held-for-sale, at fair value	0	4,146
Financing receivable, before allowance for credit loss	6,224,865	6,181,770
Less: allowance for loan losses	71,904	74,676
Loans receivable	6,152,961	6,107,094
Accrued interest receivable	28,670	29,456
Office properties and equipment, net	76,790	75,974
Bank-owned life insurance ("BOLI")	234,294	232,824
Goodwill and intangible assets	86,331	87,384
Other assets	190,549	209,852
Total assets	9,039,931	8,798,536
Liabilities:
Deposits	6,996,330	6,778,624
Borrowings	722,615	799,364
Advance payments by borrowers for taxes and insurance	33,102	32,570
Accrued expenses and other liabilities	288,235	176,691
Total liabilities	8,040,282	7,787,249
Stockholders' equity:
Preferred stock, $0.01 par value. 10,000,000 shares authorized; none issued and outstanding at March 31, 2021 and December 31, 2020	0	0
Common stock, $0.01 par value. 500,000,000 shares authorized; 122,037,793 shares issued and 108,977,571 shares outstanding at March 31, 2021 and 110,939,753 shares outstanding at December 31, 2020	1,220	1,220
Additional paid-in capital	611,549	609,531
Retained earnings	694,129	673,084
Accumulated other comprehensive loss	(72,507)	(69,625)
Treasury stock, at cost; 13,060,222 shares at March 31, 2021 and 11,098,040 shares at December 31, 2020	(195,361)	(163,015)
Common stock held by the Employee Stock Ownership Plan	(38,734)	(39,293)
Stock held by Rabbi Trust	(2,141)	(1,875)
Deferred compensation obligations	1,494	1,260
Total stockholders' equity	999,649	1,011,287
Total liabilities and stockholders' equity	$ 9,039,931	$ 8,798,536

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Debt securities held to maturity	$ 398,906	$ 277,091
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	122,037,793
Common stock, shares outstanding (in shares)	108,977,571	110,939,753
Treasury stock, shares (in shares)	13,060,222	11,098,040

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest income:
Loans receivable	$ 58,768	$ 64,018
Debt securities available for sale and equity securities	6,378	7,328
Debt securities held to maturity	1,752	2,065
Federal funds and interest earning deposits	104	189
Federal Home Loan Bank stock dividends	635	1,090
Total interest income	67,637	74,690
Interest expense:
Deposits	8,875	16,832
Borrowings	2,022	7,156
Total interest expense	10,897	23,988
Net interest income	56,740	50,702
(Reversal of) provision for loan losses	(1,280)	9,568
Net interest income after (reversal of) provision for loan losses	58,020	41,134
Non-interest income:
Bank-owned life insurance	1,474	1,417
Loan fees and service charges	651	728
Gain on securities transactions	0	370
Change in fair value of equity securities	(588)	(584)
Gain on sale of loans	2,150	754
Other non-interest income	2,450	1,176
Total non-interest income	8,595	6,391
Non-interest expense:
Compensation and employee benefits	23,393	24,465
Occupancy	5,252	4,795
Federal deposit insurance premiums	580	110
Advertising	535	1,144
Professional fees	1,790	1,366
Data processing and software expenses	2,771	2,230
Merger-related expenses	0	1,075
Loss on extinguishment of debt	742	0
Other non-interest expense	2,640	3,323
Total non-interest expense	37,703	38,508
Income before income tax expense	28,912	9,017
Income tax expense	7,867	2,252
Net income	$ 21,045	$ 6,765
Earnings per share - basic and diluted (in dollars per share)	$ 0.20	$ 0.06
Weighted average shares outstanding - basic and diluted (in shares)	105,977,621	108,438,173
Demand deposit account fees
Non-interest income:
Revenue from contract with customer	$ 838	$ 1,299
Title insurance fees
Non-interest income:
Revenue from contract with customer	$ 1,620	$ 1,231

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 21,045	$ 6,765
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on debt securities available for sale	(17,034)	19,267
Accretion of unrealized gain on debt securities reclassified as held to maturity	14	6
Reclassification adjustment for gain included in net income	0	289
Total other comprehensive (loss) income, net of tax	(17,020)	19,562
Derivatives, net of tax:
Unrealized gain (loss) on swap contracts accounted for as cash flow hedges	5,683	(11,349)
Total derivative, net of tax	5,683	(11,349)
Employee benefit plans, net of tax:
Amortization of prior service cost included in net income	(10)	33
Reclassification adjustment of actuarial net (loss) gain included in net income	(1,089)	2,084
Change in funded status of retirement obligations	9,554	(1,260)
Total employee benefit plans, net of tax	8,455	857
Total other comprehensive (loss) income	(2,882)	9,070
Total comprehensive income, net of tax	$ 18,163	$ 15,835

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, 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	(40,363)					(40,363)
Restricted stock forfeitures	(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
Balance at beginning of period at Dec. 31, 2020	1,011,287	1,220	609,531	673,084	(69,625)	(163,015)	(39,293)	(1,875)	1,260
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,045			21,045
Other comprehensive income (loss)	(2,882)				(2,882)
Treasury stock allocated to restricted stock award grants (50,203 shares)	0		(733)			733
Stock based compensation	2,143		2,143
Purchase of treasury stock	(32,837)					(32,837)
Restricted stock forfeitures	0		242			(242)
Employee Stock Ownership Plan shares committed to be released	925		366				559
Funding of deferred compensation obligations	(32)							(266)	234
Balance at end of year at Mar. 31, 2021	$ 999,649	$ 1,220	$ 611,549	$ 694,129	$ (72,507)	$ (195,361)	$ (38,734)	$ (2,141)	$ 1,494

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholder's Equity (Unaudited) (Parenthetical) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Treasury stock allocated to restricted stock award grants (in shares)	50,203
Treasury stock, shares purchased (in shares)	1,998,539	2,557,126
Restricted stock, shares forfeited (in shares)	13,846	881

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 21,045,000	$ 6,765,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Amortization of deferred loan costs, fees and purchased premiums and discounts	(1,241,000)	824,000
Net amortization of premiums and discounts on securities	1,425,000	352,000
Net amortization of mortgage servicing rights	60,000	28,000
Amortization of intangible assets	262,000	241,000
Depreciation and amortization of office properties and equipment	1,658,000	1,615,000
Amortization of operating lease right-of-use assets	904,000	929,000
Loss on extinguishment of debt	742,000	0
(Reversal of) provision for loan losses	(1,280,000)	9,568,000
Gain on securities transactions	0	(370,000)
Change in fair value of equity securities	588,000	584,000
Gain on securitizations	(1,715,000)	0
Gain on sale of loans	(435,000)	(754,000)
Loss on disposal of office properties and equipment	7,000	670,000
Loss on write-down of mortgage servicing rights	0	34,000
Deferred tax expense	736,000	7,527,000
Decrease (increase) in accrued interest receivable	786,000	(678,000)
Decrease (increase) in other assets	29,600,000	(83,451,000)
Increase in accrued expenses and other liabilities	117,631,000	45,929,000
Income on bank-owned life insurance	(1,474,000)	(1,417,000)
Employee stock ownership plan expense	925,000	907,000
Stock based compensation	2,143,000	2,204,000
(Decrease) increase in deferred compensation obligations under Rabbi Trust	(32,000)	39,000
Net cash provided by (used in) operating activities	172,335,000	(8,454,000)
Cash flows from investing activities:
Proceeds from sales of debt securities available for sale	0	20,761,000
Proceeds from paydowns/maturities/calls of debt securities available for sale	94,255,000	36,571,000
Proceeds from paydowns/maturities/calls of debt securities held to maturity	14,131,000	12,506,000
Purchases of debt securities available for sale	(208,575,000)	(50,544,000)
Purchases of debt securities held to maturity	(142,888,000)	0
Proceeds from sales of loans held-for-sale	15,822,000	51,621,000
Proceeds from sales of loans receivable	0	15,555,000
Net increase in loans receivable	(117,233,000)	(122,262,000)
Proceeds from bank-owned life insurance death benefits	4,000	0
Proceeds from redemptions of Federal Home Loan Bank stock	3,479,000	19,269,000
Purchases of Federal Home Loan Bank stock	0	(17,923,000)
Additions to office properties and equipment	(2,481,000)	(1,703,000)
Net cash (used in) investing activities	(343,486,000)	(36,149,000)
Cash flows from financing activities:
Net increase in deposits	217,706,000	126,576,000
Proceeds from long-term borrowings	0	50,000,000
Payments on long-term borrowings	(54,168,000)	(56,100,000)
Net decrease in short-term borrowings	(23,323,000)	(23,981,000)
Increase in advance payments by borrowers for taxes and insurance	532,000	1,261,000
Purchase of treasury stock	(32,837,000)	(40,363,000)
Restricted stock forfeitures	0	(13,000)
Net cash provided by financing activities	107,910,000	57,380,000
Net (decrease) increase in cash and cash equivalents	(63,241,000)	12,777,000
Cash and cash equivalents at beginning of year	422,957,000	75,547,000
Cash and cash equivalents at end of period	359,716,000	88,324,000
Cash paid during the period for:
Interest on deposits and borrowings	10,887,000	23,197,000
Income tax payments, net of (refunds)	(687,000)	0
Non-cash investing and financing activities:
Transfer of loans receivable to loans held-for-sale	11,241,000	50,949,000
Securitization of loans	64,027,000	0
Initial recognition of operating lease right-of-use assets	0	22,218,000
Initial recognition of operating lease liabilities	$ 0	$ 23,290,000

Basis of Financial Statement Pr

Basis of Financial Statement Presentation	3 Months Ended
	Mar. 31, 2021
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, 2021 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. During the year ended December 31, 2020, the Company revised the Consolidated Statement of Cash Flows. The revision consisted of reclassifying the proceeds from sales of loans held-for-sale from cash flows from operating activities to cash flows from investing activities. The impact of this revision was a decrease to cash flows from operating activities and an increase to cash flows from investing activities of $51.6 million for the quarter ended March 31, 2020. This revision had no impact on cash and cash equivalents as of March 31, 2020. 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.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Acquisitions	Acquisitions 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. The consideration paid was $136.3 million. 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 during the three months ended March 31, 2020. There were no merger expenses recorded for the three months ended March 31, 2021. 2. Acquisitions (continued) Roselle Bank On April 1, 2020, the Company completed its acquisition of RSB Bancorp, MHC, RSB Bancorp, Inc. and Roselle Bank (collectively, the "Roselle Entities" or "Roselle"). Pursuant to the terms of the Merger Agreement, RSB Bancorp, MHC merged with and into the MHC, with the MHC as the surviving entity; RSB Bancorp, Inc. merged with and into Columbia Financial, with Columbia Financial 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, 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. 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, at the effective time of the merger. 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 Roselle acquisition totaled $112,000 during the three months ended March 31, 2020. There were no merger expenses recorded for the three months ended March 31, 2021. The following table sets forth assets acquired and liabilities assumed in the Roselle acquisition, at their estimated fair values as of the closing date of the transaction: April 1, 2020 (In thousands) Assets acquired: Cash and cash equivalents $ 155,248 Debt securities available for sale 51,479 Debt securities held to maturity 13,418 Equity securities 1,796 Federal Home Loan Bank stock 2,010 Loans receivable 171,593 Accrued interest receivable 679 Office properties and equipment, net 5,774 Bank-owned life insurance 17,245 Deferred tax asset, net 1,334 Other assets 1,489 Total assets acquired $ 422,065 Liabilities assumed: Deposits $ 333,234 Borrowings 37,728 Advance payments by borrowers for taxes and insurance 982 Accrued expenses and other liabilities 5,400 Total liabilities assumed $ 377,344 Net assets acquired 44,721 Fair market value of stock issued to Columbia Bank MHC for purchase 68,530 Goodwill recorded at merger $ 23,809 2. Acquisitions (continued) Roselle Bank The assets acquired and liabilities assumed have been accounted for under the acquisition method of accounting. The assets and liabilities were recorded at their fair values as of April 1, 2020, and resulted in the recognition of goodwill of $23.8 million. The determination of the fair value of assets acquired and liabilities assumed required management to make estimates about discount rates, future expected cash flows, market condition, and other future events that are highly subjective in nature and subject to change. The fair value estimates are subject to change for up to one year after the closing date of the transaction if additional information (existing at the date of closing) relative to closing date fair values becomes available. During the fourth quarter of 2020, the Company completed all tax returns related to the operation of the acquired entity and its impact on the Company's income taxes, which resulted in a $5.1 million adjustment to deferred income taxes, net, and a decrease in goodwill. During the quarter ended March 31, 2021, the Company recorded a final adjustment of $1.1 million to deferred income taxes, net, and a decrease in goodwill. At March 31, 2021, goodwill related to the Roselle acquisition totaled $17.6 million.

Earnings per Share

Earnings per Share	3 Months Ended
	Mar. 31, 2021
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. 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, 2021 and 2020: Three Months Ended March 31, 2021 2020 (Dollars in thousands, except per share data) Net income $ 21,045 $ 6,765 Shares: Weighted average shares outstanding - basic 105,977,621 108,438,173 Weighted average dilutive shares outstanding — — Weighted average shares outstanding - diluted 105,977,621 108,438,173 Earnings per share: Basic $ 0.20 $ 0.06 Diluted $ 0.20 $ 0.06 During the three months ended March 31, 2021 and 2020, the average number of stock options which were anti-dilutive and were not included in the computation of diluted earnings per share totaled 468,156 and 811,853, respectively.

Stock Repurchase Program

Stock Repurchase Program	3 Months Ended
	Mar. 31, 2021
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 the 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. On April 23, 2020, the Company completed the repurchases under these stock repurchase programs. On September 10, 2020, the Company announced that its Board of Directors authorized the Company's second stock repurchase program for the purchase of up to 5,000,000 shares, or approximately 4.3%, of the Company's issued and outstanding common stock, commencing on September 15, 2020. On February 1, 2021, the Company announced that its Board of Directors authorized the Company's third stock repurchase program to acquire up to 5,000,000 shares, or approximately 4.5%, of the Company's then issued and outstanding common stock, commencing upon completion of the Company's second stock repurchase program.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Accounting Pronouncement Adopted in 2021 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. The amendments in this update modify the disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans by removing disclosures that no longer are considered cost beneficial, clarifying the specific requirements of disclosures, and adding disclosure requirements identified as relevant. Among other changes, the ASU adds disclosure requirements to Topic 715-20 for the weighted-average interest crediting rates for cash balance plans and other plans with promised interest crediting rates and an explanation of the reasons for significant gains and losses related to changes in benefit obligation for the period. The amendments remove disclosure requirements for the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year, the amount and timing of plan assets expected to be returned to the employer, and the effects of a one-percentage-point change in assumed health care cost trend rates on the (a) aggregate of the service and interest cost components of net periodic benefit costs and (b) benefit obligation for post-retirement health care benefits. ASU 2018-14 is effective for fiscal years beginning after December 15, 2020, including interim reporting periods within that reporting period, with early adoption permitted. The Company adopted this ASU effective January 1, 2021. The update will be applied on a retrospective basis to disclosures with regard to employee benefit plans. The adoption of this update did not have a significant impact on the Company's consolidated financial statements. 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 until December 31, 2020 as permitted by the enacted Coronavirus Aid, Relief and Economic Security Act ("CARES Act"). In late December 2020, the Consolidated Appropriations Act, 2021 was enacted, and extended certain provisions of the CARES Act, which allowed the Company to extend the adoption of CECL until January 1, 2022. The Company elected to extend its adoption of CECL in accordance with recent legislation, and 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: 5. Summary of Significant Accounting Policies Accounting Pronouncements Not Yet Adopted (continued) • 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, 2021, we currently expect the adoption of ASU 2016-13 will result in a decrease between 15% and 25% 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 decrease 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.

Debt Securities Available for S

Debt Securities Available for Sale	3 Months Ended
	Mar. 31, 2021
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, 2021 and December 31, 2020 are summarized as follows: March 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 39,008 $ 942 $ (155) $ 39,795 Mortgage-backed securities and collateralized mortgage obligations 1,331,338 26,471 (9,268) 1,348,541 Municipal obligations 16,633 16 — 16,649 Corporate debt securities 62,667 2,212 (314) 64,565 Trust preferred securities 5,000 — (304) 4,696 $ 1,454,646 $ 29,641 $ (10,041) $ 1,474,246 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 24,425 $ 1,124 $ — $ 25,549 Mortgage-backed securities and collateralized mortgage obligations 1,163,613 37,343 (562) 1,200,394 Municipal obligations 16,845 17 — 16,862 Corporate debt securities 67,628 2,264 (415) 69,477 Trust preferred securities 5,000 — (330) 4,670 $ 1,277,511 $ 40,748 $ (1,307) $ 1,316,952 The amortized cost and fair value of debt securities available for sale at March 31, 2021, 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, 2021 Amortized Cost Fair Value (In thousands) One year or less $ 16,168 $ 16,168 More than one year to five years 60,123 61,736 More than five years to ten years 47,017 47,801 $ 123,308 $ 125,705 Mortgage-backed securities and collateralized mortgage obligations 1,331,338 1,348,541 $ 1,454,646 $ 1,474,246 Mortgage-backed securities and collateralized mortgage obligations totaling $1.3 billion at amortized cost, and $1.3 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. 6. Debt Securities Available for Sale (continued) During the three months ended March 31, 2021, there were no sales of debt securities available for sale. During the three months ended March 31, 2021, proceeds from one called debt security available for sale totaled $5.0 million, resulting in no gross gain or loss, and proceeds from two matured debt securities available for sale totaled $210,000. 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. During the three months ended March 31, 2020, proceeds from called debt securities available for sale totaled $1.1 million, resulting in $1,000 of gross gains and no gross losses. During the three months ended March 31, 2020, proceeds from matured debt securities available for sale totaled $635,000. Debt securities available for sale having a carrying value of $788.0 million and $822.2 million, at March 31, 2021 and December 31, 2020, 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, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2021 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 $ 14,530 $ (155) $ — $ — $ 14,530 $ (155) Mortgage-backed securities and collateralized mortgage obligations 431,061 (9,241) 9,898 (27) 440,959 (9,268) Corporate debt securities 4,846 (154) 4,840 (160) 9,686 (314) Trust preferred securities — — 4,697 (304) 4,697 (304) $ 450,437 $ (9,550) $ 19,435 $ (491) $ 469,872 $ (10,041) December 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 $ 117,978 $ (481) $ 24,018 $ (81) $ 141,996 $ (562) Corporate debt securities 9,845 (155) 5,740 (260) 15,585 (415) Trust preferred securities — — 4,670 (330) 4,670 (330) $ 127,823 $ (636) $ 34,428 $ (671) $ 162,251 $ (1,307) 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, 2021, nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery. 6. Debt Securities Available for Sale (continued) The number of securities in an unrealized loss position at March 31, 2021 totaled 72, compared with 40 at December 31, 2020. All temporarily impaired securities were investment grade as of March 31, 2021 and December 31, 2020. The Company did not record an other-than-temporary impairment charge on debt securities available for sale during the three months ended March 31, 2021 and 2020. Debt securities held to maturity at March 31, 2021 and December 31, 2020 are summarized as follows: March 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 34,995 $ — $ (493) $ 34,502 Mortgage-backed securities and collateralized mortgage obligations 356,269 8,899 (764) 364,404 $ 391,264 $ 8,899 $ (1,257) $ 398,906 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 5,000 $ 1 $ — $ 5,001 Mortgage-backed securities and collateralized mortgage obligations 257,720 14,372 (2) 272,090 $ 262,720 $ 14,373 $ (2) $ 277,091 The amortized cost and fair value of debt held to maturity at March 31, 2021, 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, 2021 Amortized Cost Fair Value (In thousands) More than one year to five years $ 15,000 $ 14,969 More than five years to ten years 19,995 19,533 34,995 34,502 Mortgage-backed securities and collateralized mortgage obligations 356,269 364,404 $ 391,264 $ 398,906 Mortgage-backed securities and collateralized mortgage obligations totaling $356.3 million at amortized cost, and $364.4 million at fair value at March 31, 2021, are not classified by maturity 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, 2021, there were no sales or maturities of debt securities held to maturity. During the three months ended March 31, 2021, proceeds from one called debt security held to maturity totaled $5.0 million, resulting in no gross gain or loss. During the three months ended March 31, 2020, there were no sales or maturities of debt securities held to maturity. During the three months ended March 31, 2020, proceeds from the call of one debt security held to maturity totaled $10.0 million, resulting in no gross gain or loss. 7. Debt Securities Held to Maturity (continued) Debt securities held to maturity having a carrying value of $212.6 million and $220.5 million, at March 31, 2021 and December 31, 2020, 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, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2021 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 $ 34,502 $ (493) $ — $ — $ 34,502 $ (493) Mortgage-backed securities and collateralized mortgage obligations 77,010 (764) — — 77,010 (764) $ 111,512 $ (1,257) $ — $ — $ 111,512 $ (1,257) December 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 $ 2,176 $ (2) $ — $ — $ 2,176 $ (2) 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, 2021, 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 at March 31, 2021 totaled 15, compared with 2 at December 31, 2020. All temporarily impaired securities were investment grade as of March 31, 2021 and December 31, 2020. The Company did not record an other-than-temporary impairment charge on debt securities held to maturity during the three and months ended March 31, 2021 and 2020. The Company has an equity securities portfolio which consists of stock in other financial institutions, a payment technology company, a community bank correspondent services company, and preferred stock in U.S. Government agencies which are reported at fair value on the Company's Consolidated Statements of Financial Condition. The fair value of the equities portfolio at March 31, 2021 and December 31, 2020 was $4.8 million and $5.4 million, respectively. The Company recorded a net decrease in the fair value of equity securities of $588,000 and $584,000, for the three months ended March 31, 2021 and 2020, respectively, as a component of non-interest income.

Debt Securities Held to Maturit

Debt Securities Held to Maturity	3 Months Ended
	Mar. 31, 2021
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, 2021 and December 31, 2020 are summarized as follows: March 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 39,008 $ 942 $ (155) $ 39,795 Mortgage-backed securities and collateralized mortgage obligations 1,331,338 26,471 (9,268) 1,348,541 Municipal obligations 16,633 16 — 16,649 Corporate debt securities 62,667 2,212 (314) 64,565 Trust preferred securities 5,000 — (304) 4,696 $ 1,454,646 $ 29,641 $ (10,041) $ 1,474,246 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 24,425 $ 1,124 $ — $ 25,549 Mortgage-backed securities and collateralized mortgage obligations 1,163,613 37,343 (562) 1,200,394 Municipal obligations 16,845 17 — 16,862 Corporate debt securities 67,628 2,264 (415) 69,477 Trust preferred securities 5,000 — (330) 4,670 $ 1,277,511 $ 40,748 $ (1,307) $ 1,316,952 The amortized cost and fair value of debt securities available for sale at March 31, 2021, 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, 2021 Amortized Cost Fair Value (In thousands) One year or less $ 16,168 $ 16,168 More than one year to five years 60,123 61,736 More than five years to ten years 47,017 47,801 $ 123,308 $ 125,705 Mortgage-backed securities and collateralized mortgage obligations 1,331,338 1,348,541 $ 1,454,646 $ 1,474,246 Mortgage-backed securities and collateralized mortgage obligations totaling $1.3 billion at amortized cost, and $1.3 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. 6. Debt Securities Available for Sale (continued) During the three months ended March 31, 2021, there were no sales of debt securities available for sale. During the three months ended March 31, 2021, proceeds from one called debt security available for sale totaled $5.0 million, resulting in no gross gain or loss, and proceeds from two matured debt securities available for sale totaled $210,000. 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. During the three months ended March 31, 2020, proceeds from called debt securities available for sale totaled $1.1 million, resulting in $1,000 of gross gains and no gross losses. During the three months ended March 31, 2020, proceeds from matured debt securities available for sale totaled $635,000. Debt securities available for sale having a carrying value of $788.0 million and $822.2 million, at March 31, 2021 and December 31, 2020, 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, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2021 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 $ 14,530 $ (155) $ — $ — $ 14,530 $ (155) Mortgage-backed securities and collateralized mortgage obligations 431,061 (9,241) 9,898 (27) 440,959 (9,268) Corporate debt securities 4,846 (154) 4,840 (160) 9,686 (314) Trust preferred securities — — 4,697 (304) 4,697 (304) $ 450,437 $ (9,550) $ 19,435 $ (491) $ 469,872 $ (10,041) December 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 $ 117,978 $ (481) $ 24,018 $ (81) $ 141,996 $ (562) Corporate debt securities 9,845 (155) 5,740 (260) 15,585 (415) Trust preferred securities — — 4,670 (330) 4,670 (330) $ 127,823 $ (636) $ 34,428 $ (671) $ 162,251 $ (1,307) 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, 2021, nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery. 6. Debt Securities Available for Sale (continued) The number of securities in an unrealized loss position at March 31, 2021 totaled 72, compared with 40 at December 31, 2020. All temporarily impaired securities were investment grade as of March 31, 2021 and December 31, 2020. The Company did not record an other-than-temporary impairment charge on debt securities available for sale during the three months ended March 31, 2021 and 2020. Debt securities held to maturity at March 31, 2021 and December 31, 2020 are summarized as follows: March 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 34,995 $ — $ (493) $ 34,502 Mortgage-backed securities and collateralized mortgage obligations 356,269 8,899 (764) 364,404 $ 391,264 $ 8,899 $ (1,257) $ 398,906 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 5,000 $ 1 $ — $ 5,001 Mortgage-backed securities and collateralized mortgage obligations 257,720 14,372 (2) 272,090 $ 262,720 $ 14,373 $ (2) $ 277,091 The amortized cost and fair value of debt held to maturity at March 31, 2021, 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, 2021 Amortized Cost Fair Value (In thousands) More than one year to five years $ 15,000 $ 14,969 More than five years to ten years 19,995 19,533 34,995 34,502 Mortgage-backed securities and collateralized mortgage obligations 356,269 364,404 $ 391,264 $ 398,906 Mortgage-backed securities and collateralized mortgage obligations totaling $356.3 million at amortized cost, and $364.4 million at fair value at March 31, 2021, are not classified by maturity 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, 2021, there were no sales or maturities of debt securities held to maturity. During the three months ended March 31, 2021, proceeds from one called debt security held to maturity totaled $5.0 million, resulting in no gross gain or loss. During the three months ended March 31, 2020, there were no sales or maturities of debt securities held to maturity. During the three months ended March 31, 2020, proceeds from the call of one debt security held to maturity totaled $10.0 million, resulting in no gross gain or loss. 7. Debt Securities Held to Maturity (continued) Debt securities held to maturity having a carrying value of $212.6 million and $220.5 million, at March 31, 2021 and December 31, 2020, 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, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2021 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 $ 34,502 $ (493) $ — $ — $ 34,502 $ (493) Mortgage-backed securities and collateralized mortgage obligations 77,010 (764) — — 77,010 (764) $ 111,512 $ (1,257) $ — $ — $ 111,512 $ (1,257) December 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 $ 2,176 $ (2) $ — $ — $ 2,176 $ (2) 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, 2021, 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 at March 31, 2021 totaled 15, compared with 2 at December 31, 2020. All temporarily impaired securities were investment grade as of March 31, 2021 and December 31, 2020. The Company did not record an other-than-temporary impairment charge on debt securities held to maturity during the three and months ended March 31, 2021 and 2020. The Company has an equity securities portfolio which consists of stock in other financial institutions, a payment technology company, a community bank correspondent services company, and preferred stock in U.S. Government agencies which are reported at fair value on the Company's Consolidated Statements of Financial Condition. The fair value of the equities portfolio at March 31, 2021 and December 31, 2020 was $4.8 million and $5.4 million, respectively. The Company recorded a net decrease in the fair value of equity securities of $588,000 and $584,000, for the three months ended March 31, 2021 and 2020, respectively, as a component of non-interest income.

Equity Securities at Fair Value

Equity Securities at Fair Value	3 Months Ended
	Mar. 31, 2021
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, 2021 and December 31, 2020 are summarized as follows: March 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 39,008 $ 942 $ (155) $ 39,795 Mortgage-backed securities and collateralized mortgage obligations 1,331,338 26,471 (9,268) 1,348,541 Municipal obligations 16,633 16 — 16,649 Corporate debt securities 62,667 2,212 (314) 64,565 Trust preferred securities 5,000 — (304) 4,696 $ 1,454,646 $ 29,641 $ (10,041) $ 1,474,246 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 24,425 $ 1,124 $ — $ 25,549 Mortgage-backed securities and collateralized mortgage obligations 1,163,613 37,343 (562) 1,200,394 Municipal obligations 16,845 17 — 16,862 Corporate debt securities 67,628 2,264 (415) 69,477 Trust preferred securities 5,000 — (330) 4,670 $ 1,277,511 $ 40,748 $ (1,307) $ 1,316,952 The amortized cost and fair value of debt securities available for sale at March 31, 2021, 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, 2021 Amortized Cost Fair Value (In thousands) One year or less $ 16,168 $ 16,168 More than one year to five years 60,123 61,736 More than five years to ten years 47,017 47,801 $ 123,308 $ 125,705 Mortgage-backed securities and collateralized mortgage obligations 1,331,338 1,348,541 $ 1,454,646 $ 1,474,246 Mortgage-backed securities and collateralized mortgage obligations totaling $1.3 billion at amortized cost, and $1.3 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. 6. Debt Securities Available for Sale (continued) During the three months ended March 31, 2021, there were no sales of debt securities available for sale. During the three months ended March 31, 2021, proceeds from one called debt security available for sale totaled $5.0 million, resulting in no gross gain or loss, and proceeds from two matured debt securities available for sale totaled $210,000. 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. During the three months ended March 31, 2020, proceeds from called debt securities available for sale totaled $1.1 million, resulting in $1,000 of gross gains and no gross losses. During the three months ended March 31, 2020, proceeds from matured debt securities available for sale totaled $635,000. Debt securities available for sale having a carrying value of $788.0 million and $822.2 million, at March 31, 2021 and December 31, 2020, 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, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2021 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 $ 14,530 $ (155) $ — $ — $ 14,530 $ (155) Mortgage-backed securities and collateralized mortgage obligations 431,061 (9,241) 9,898 (27) 440,959 (9,268) Corporate debt securities 4,846 (154) 4,840 (160) 9,686 (314) Trust preferred securities — — 4,697 (304) 4,697 (304) $ 450,437 $ (9,550) $ 19,435 $ (491) $ 469,872 $ (10,041) December 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 $ 117,978 $ (481) $ 24,018 $ (81) $ 141,996 $ (562) Corporate debt securities 9,845 (155) 5,740 (260) 15,585 (415) Trust preferred securities — — 4,670 (330) 4,670 (330) $ 127,823 $ (636) $ 34,428 $ (671) $ 162,251 $ (1,307) 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, 2021, nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery. 6. Debt Securities Available for Sale (continued) The number of securities in an unrealized loss position at March 31, 2021 totaled 72, compared with 40 at December 31, 2020. All temporarily impaired securities were investment grade as of March 31, 2021 and December 31, 2020. The Company did not record an other-than-temporary impairment charge on debt securities available for sale during the three months ended March 31, 2021 and 2020. Debt securities held to maturity at March 31, 2021 and December 31, 2020 are summarized as follows: March 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 34,995 $ — $ (493) $ 34,502 Mortgage-backed securities and collateralized mortgage obligations 356,269 8,899 (764) 364,404 $ 391,264 $ 8,899 $ (1,257) $ 398,906 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 5,000 $ 1 $ — $ 5,001 Mortgage-backed securities and collateralized mortgage obligations 257,720 14,372 (2) 272,090 $ 262,720 $ 14,373 $ (2) $ 277,091 The amortized cost and fair value of debt held to maturity at March 31, 2021, 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, 2021 Amortized Cost Fair Value (In thousands) More than one year to five years $ 15,000 $ 14,969 More than five years to ten years 19,995 19,533 34,995 34,502 Mortgage-backed securities and collateralized mortgage obligations 356,269 364,404 $ 391,264 $ 398,906 Mortgage-backed securities and collateralized mortgage obligations totaling $356.3 million at amortized cost, and $364.4 million at fair value at March 31, 2021, are not classified by maturity 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, 2021, there were no sales or maturities of debt securities held to maturity. During the three months ended March 31, 2021, proceeds from one called debt security held to maturity totaled $5.0 million, resulting in no gross gain or loss. During the three months ended March 31, 2020, there were no sales or maturities of debt securities held to maturity. During the three months ended March 31, 2020, proceeds from the call of one debt security held to maturity totaled $10.0 million, resulting in no gross gain or loss. 7. Debt Securities Held to Maturity (continued) Debt securities held to maturity having a carrying value of $212.6 million and $220.5 million, at March 31, 2021 and December 31, 2020, 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, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2021 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 $ 34,502 $ (493) $ — $ — $ 34,502 $ (493) Mortgage-backed securities and collateralized mortgage obligations 77,010 (764) — — 77,010 (764) $ 111,512 $ (1,257) $ — $ — $ 111,512 $ (1,257) December 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 $ 2,176 $ (2) $ — $ — $ 2,176 $ (2) 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, 2021, 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 at March 31, 2021 totaled 15, compared with 2 at December 31, 2020. All temporarily impaired securities were investment grade as of March 31, 2021 and December 31, 2020. The Company did not record an other-than-temporary impairment charge on debt securities held to maturity during the three and months ended March 31, 2021 and 2020. The Company has an equity securities portfolio which consists of stock in other financial institutions, a payment technology company, a community bank correspondent services company, and preferred stock in U.S. Government agencies which are reported at fair value on the Company's Consolidated Statements of Financial Condition. The fair value of the equities portfolio at March 31, 2021 and December 31, 2020 was $4.8 million and $5.4 million, respectively. The Company recorded a net decrease in the fair value of equity securities of $588,000 and $584,000, for the three months ended March 31, 2021 and 2020, respectively, as a component of non-interest income.

Loans Receivable and Allowance

Loans Receivable and Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Loans Receivable and Allowance for Loan Losses	Loans Receivable and Allowance for Loan Losses Loans receivable at March 31, 2021 and December 31, 2020 are summarized as follows: March 31, December 31, 2021 2020 (In thousands) Real estate loans: One-to-four family $ 1,877,131 $ 1,940,327 Multifamily and commercial 2,873,586 2,817,965 Construction 338,001 328,711 Commercial business loans 825,469 752,870 Consumer loans: Home equity loans and advances 294,230 321,177 Other consumer loans 1,181 1,497 Total gross loans 6,209,598 6,162,547 Purchased credit-impaired loans 6,230 6,345 Net deferred loan costs, fees and purchased premiums and discounts 9,037 12,878 Loans receivable $ 6,224,865 $ 6,181,770 The Company had no loans held-for-sale at March 31, 2021. The Company had $4.1 million of SBA loans held-for-sale at December 31, 2020. During the three months ended March 31, 2021, the Company sold $1.2 million, $4.1 million, and $6.4 million of one-to-four family real estate loans and home equity loans, multifamily and commercial real estate loans, and construction loans held-for-sale, respectively, resulting in no gross gains or losses. During three months ended March 31, 2021, the Company sold $4.2 million of commercial business loans held-for-sale, resulting in gross gains of $435,000 and no gross losses. 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, 2021, no loans included in loans receivable were sold by the Company. During the three months ended March 31, 2020, the Company sold $8.8 million of one-to-four family real estate and home equity loans and $6.7 million representing one commercial business loan included in loans receivable, resulting in gross gains $82,000 and no gross losses. During the three months ended March 31, 2021 and 2020, there were no loans purchased by the Company. At March 31, 2021 and December 31, 2020, commercial business loans included $446.2 million and $344.4 million, respectively, in SBA Payroll Protection Program ("PPP") loans and net deferred fees related to these loans totaling $11.3 million and $6.6 million, respectively. The Company has entered into guarantor swaps with Freddie Mac which results in improved liquidity. During the three months ended March 31, 2021, the Company exchanged $64.0 million of loans for Freddie Mac mortgage participation certificates, resulting in gross gains of $1.7 million and no gross losses. The Company retained the servicing of these loans. During the three months ended March 31, 2020, no loans were sold. At March 31, 2021 and December 31, 2020, the carrying value of loans serviced by the Company for investors was $601.6 million and $598.0 million, respectively. These loans are not included in the Consolidated Statements of Financial Condition. 9. Loans Receivable and Allowance for Loan Losses (continued) The following tables summarize the aging of loans receivable by portfolio segment, including non-accrual loans and excluding PCI loans at March 31, 2021 and December 31, 2020: March 31, 2021 30-59 Days 60-89 Days 90 Days or More Total Past Due Non-accrual Current Total (In thousands) Real estate loans: One-to-four family $ 1,542 $ 367 $ 1,204 $ 3,113 $ 2,097 $ 1,871,921 $ 1,877,131 Multifamily and commercial 4,027 — 1,238 5,265 1,864 2,866,457 2,873,586 Construction — — — — — 338,001 338,001 Commercial business loans 1,836 — 1,292 3,128 1,790 820,551 825,469 Consumer loans: Home equity loans and advances 520 132 253 905 403 292,922 294,230 Other consumer loans 4 — — 4 — 1,177 1,181 Total loans $ 7,929 $ 499 $ 3,987 $ 12,415 $ 6,154 $ 6,191,029 $ 6,209,598 December 31, 2020 30-59 Days 60-89 Days 90 Days or More Total Past Due Non-accrual Current Total (In thousands) Real estate loans: One-to-four family $ 3,068 $ 912 $ 1,901 $ 5,881 $ 2,637 $ 1,931,809 $ 1,940,327 Multifamily and commercial 15,645 — 1,238 16,883 1,873 2,799,209 2,817,965 Construction 550 — — 550 — 328,161 328,711 Commercial business loans 2,343 1,056 2,453 5,852 2,968 744,050 752,870 Consumer loans: Home equity loans and advances 1,156 696 394 2,246 678 318,253 321,177 Other consumer loans 4 — — 4 — 1,493 1,497 Total loans $ 22,766 $ 2,664 $ 5,986 $ 31,416 $ 8,156 $ 6,122,975 $ 6,162,547 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, 2021 and December 31, 2020, non-accrual loans totaled $6.2 million and $8.2 million, respectively. Included in non-accrual loans at March 31, 2021, are 18 loans totaling $2.2 million which are less than 90 days in arrears. At December 31, 2020, 19 loans totaling $2.2 million were less than 90 days in arrears. At March 31, 2021 and December 31, 2020, there were no loans past due 90 days or more still accruing interest other than COVID-19 related loan forbearances and deferrals. In accordance with the CARES Act, these loans are not included in the aging of loans receivable by portfolio segment in the table above, and the Bank continues to accrue interest income during the forbearance or deferral period. If adverse information indicating that the borrower's capability of repaying all amounts due is unlikely, the interest accrual will cease. 9. Loans Receivable and Allowance for Loan Losses (continued) PCI loans are loans acquired at a discount primarily due to deteriorated credit quality. These loans are initially recorded 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 $6.0 million at March 31, 2021 and $6.1 million at December 31, 2020. PCI loans acquired in the Roselle acquisition totaled $244,000 at March 31, 2021 and $246,000 at December 31, 2020. The following table presents changes in accretable yield for PCI loans for the three months ended March 31, 2021 and 2020. March 31, 2021 2020 (In thousands) Balance at beginning of period $ 418 $ 511 Accretion (32) (49) Net change in expected cash flows 22 1 Balance at end of period $ 408 $ 463 We may obtain physical possession of real estate collateralizing a residential mortgage loan via foreclosure or through an in-substance repossession. At March 31, 2021 and December 31, 2020, the Company had no real estate owned. At March 31, 2021 we had no residential mortgage loans in foreclosure. At December 31, 2020 we had two residential mortgage loans with carrying values totaling $398,000 collateralized by residential real estate which were in the process of foreclosure. The states of New Jersey, New York and Pennsylvania have issued executive orders which declare moratoriums on removing individuals from a residential property until at least two months after the COVID health crisis has ended. In response to these orders, in March 2020, the Company temporarily suspended residential property foreclosure sales and evictions. The following tables summarize loans receivable (including PCI loans) and allowance for loan losses by portfolio segment and impairment method at March 31, 2021 and December 31, 2020: March 31, 2021 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 $ 290 $ 78 $ — $ 360 $ 12 $ — $ 740 Collectively evaluated for impairment 19,560 23,771 11,464 14,444 1,919 6 71,164 Loans acquired with deteriorated credit quality — — — — — — — Total $ 19,850 $ 23,849 $ 11,464 $ 14,804 $ 1,931 $ 6 $ 71,904 Total loans: Individually evaluated for impairment $ 6,630 $ 32,533 $ — $ 2,467 $ 1,570 $ — $ 43,200 Collectively evaluated for impairment 1,870,501 2,841,053 338,001 823,002 292,660 1,181 6,166,398 Loans acquired with deteriorated credit quality 301 4,852 — 1,077 — — 6,230 Total loans $ 1,877,432 $ 2,878,438 $ 338,001 $ 826,546 $ 294,230 $ 1,181 $ 6,215,828 9. Loans Receivable and Allowance for Loan Losses (continued) December 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 $ 391 $ 601 $ — $ 84 $ 12 $ — $ 1,088 Collectively evaluated for impairment 13,195 30,080 11,271 17,300 1,736 6 73,588 Loans acquired with deteriorated credit quality — — — — — — — Total $ 13,586 $ 30,681 $ 11,271 $ 17,384 $ 1,748 $ 6 $ 74,676 Total loans: Individually evaluated for impairment $ 7,257 $ 32,792 $ — $ 3,447 $ 1,651 $ — $ 45,147 Collectively evaluated for impairment 1,933,070 2,785,173 328,711 749,423 319,526 1,497 6,117,400 Loans acquired with deteriorated credit quality 309 4,893 — 1,143 — — 6,345 Total loans $ 1,940,636 $ 2,822,858 $ 328,711 $ 754,013 $ 321,177 $ 1,497 $ 6,168,892 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. These short-term loan modifications was not treated as a troubled debt restructuring during the short-term modification period if the loan was not in arrears at December 31, 2019. Furthermore, based on current evaluations, generally, we have continued the accrual of interest on these loans during the short-term modification period. The Consolidated Appropriations Act, 2021, which was enacted in late December 2020, extended certain provisions of the CARES Act, including provisions permitting loan deferral extension requests to not be treated as troubled debt restructurings. 9. Loans Receivable and Allowance for Loan Losses (continued) The following tables present the number of loans modified as TDRs during the three months ended March 31, 2021 and 2020, 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. Three Months Ended March 31, 2021 2020 No. of Loans Pre-modification Recorded Investment Post-modification Recorded Investment No. of Loans Pre-modification Recorded Investment Post-modification Recorded Investment (Dollars in thousands) Troubled Debt Restructurings Real Estate loans: Multifamily and commercial — $ — $ — 1 $ 10,212 $ 11,507 Total restructured loans — $ — $ — 1 $ 10,212 $ 11,507 The activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2021 and 2020 are as follows: Three Months Ended March 31, One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) 2021 Balance at beginning of period $ 13,586 $ 30,681 $ 11,271 $ 17,384 $ 1,748 $ 6 $ 74,676 Provision charged (credited) 6,477 (6,672) 192 (1,509) 230 2 (1,280) Recoveries 3 6 1 16 11 — 37 Charge-offs (216) (166) — (1,087) (58) (2) (1,529) Balance at end of period $ 19,850 $ 23,849 $ 11,464 $ 14,804 $ 1,931 $ 6 $ 71,904 2020 Balance at beginning of period $ 13,780 $ 22,980 $ 7,435 $ 15,836 $ 1,669 $ 9 $ 61,709 Provision charged 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 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, 2021 and December 31, 2020: At March 31, 2021 Recorded Investment Unpaid Principal Balance Specific Allowance (In thousands) With no allowance recorded: Real estate loans: One-to-four family $ 2,845 $ 3,385 $ — Multifamily and commercial 14,879 15,694 — Commercial business loans 643 643 — Consumer loans: Home equity loans and advances 611 743 — 18,978 20,465 — With a specific allowance recorded: Real estate loans: One-to-four family 3,785 3,803 290 Multifamily and commercial 17,654 17,657 78 Commercial business loans 1,824 2,780 360 Consumer loans: Home equity loans and advances 959 959 12 24,222 25,199 740 Total: Real estate loans: One-to-four family 6,630 7,188 290 Multifamily and commercial 32,533 33,351 78 Commercial business loans 2,467 3,423 360 Consumer loans: Home equity loans and advances 1,570 1,702 12 Total loans $ 43,200 $ 45,664 $ 740 9. Loans Receivable and Allowance for Loan Losses (continued) At December 31, 2020 Recorded Investment Unpaid Principal Balance Specific Allowance (In thousands) With no allowance recorded: Real estate loans: One-to-four family $ 3,344 $ 3,898 $ — Multifamily and commercial 13,058 13,094 — Commercial business loans 1,945 1,945 — Consumer loans: Home equity loans and advances 714 851 — 19,061 19,788 — With a specific allowance recorded: Real estate loans: One-to-four family 3,913 3,919 391 Multifamily and commercial 19,734 20,350 601 Commercial business loans 1,502 1,502 84 Consumer loans: Home equity loans and advances 937 937 12 26,086 26,708 1,088 Total: Real estate loans: One-to-four family 7,257 7,817 391 Multifamily and commercial 32,792 33,444 601 Commercial business loans 3,447 3,447 84 Consumer loans: Home equity loans and advances 1,651 1,788 12 $ 45,147 $ 46,496 $ 1,088 Specific allocations of the allowance for loan losses attributable to impaired loans totaled $740,000 and $1.1 million at March 31, 2021 and December 31, 2020, respectively. At March 31, 2021 and December 31, 2020, impaired loans for which there was no related allowance for loan losses totaled $19.0 million and $19.1 million, respectively. The recorded investment in TDRs totaled $44.5 million at March 31, 2021, of which two loans totaling $124,000 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 March 31, 2021. The recorded investment in TDRs totaled $45.4 million at December 31, 2020, of which one loan totaling $91,000 was over 90 days past due, and three loans totaling $11.9 million 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, 2020. 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, 2021 and 2020: Three Months Ended March 31, 2021 2020 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (In thousands) Real estate loans: One-to-four family $ 6,944 $ 74 $ 8,688 $ 99 Multifamily and commercial 32,663 425 8,780 166 Commercial business loans 2,957 29 5,814 72 Consumer loans: Home equity loans and advances 1,611 22 2,130 30 Total loans $ 44,175 $ 550 $ 25,412 $ 367 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, 2021 and December 31, 2020: March 31, 2021 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Pass $ 1,870,683 $ 2,803,914 $ 338,001 $ 814,629 $ 293,534 $ 1,181 $ 6,121,942 Special mention 399 51,121 — 6,192 — — 57,712 Substandard 6,049 18,551 — 4,648 696 — 29,944 Doubtful — — — — — — — Loss — — — — — — — Total $ 1,877,131 $ 2,873,586 $ 338,001 $ 825,469 $ 294,230 $ 1,181 $ 6,209,598 9. Loans Receivable and Allowance for Loan Losses (continued) December 31, 2020 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Pass $ 1,935,032 $ 2,758,905 $ 328,711 $ 740,010 $ 320,092 $ 1,497 $ 6,084,247 Special mention 404 40,392 — 6,718 — — 47,514 Substandard 4,891 18,668 — 6,142 1,085 — 30,786 Doubtful — — — — — — — Loss — — — — — — — Total $ 1,940,327 $ 2,817,965 $ 328,711 $ 752,870 $ 321,177 $ 1,497 $ 6,162,547

Leases

Leases	3 Months Ended
	Mar. 31, 2021
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 . The Company's leases primarily relate to real estate property for branches and office space. At March 31, 2021 and December 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 3 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. At March 31, 2021 and December 31, 2020, the weighted average remaining lease term for operating leases was 7.3 years and 7.5 years, respectively, and the weighted average discount rate used in the measurement of operating lease liabilities was 2.22%, and 2.26%, respectively. 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, 2021 and 2020, operating and variable lease expenses totaled approximately $681,000 and $694,000, respectively. There were no sale and leaseback transactions, leveraged leases or lease transactions with related parties during the three months ended March 31, 2021 and 2020. At March 31, 2021, 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, 2021 Lease Payment Obligations (In thousands) 2021 $ 3,081 2022 3,827 2023 3,437 2024 2,712 2025 2,041 Thereafter 6,709 Total undiscounted cash flows 21,807 Discount on cash flows (1,903) Total lease liability $ 19,904

Deposits

Deposits	3 Months Ended
	Mar. 31, 2021
Deposits [Abstract]
Deposits	Deposits Deposits at March 31, 2021 and December 31, 2020 are summarized as follows: March 31, December 31, 2021 2020 (In thousands) Non-interest-bearing demand $ 1,489,511 $ 1,354,605 Interest-bearing demand 2,276,501 2,189,164 Money market accounts 621,064 588,180 Savings and club deposits 732,598 688,309 Certificates of deposit 1,876,656 1,958,366 Total deposits $ 6,996,330 $ 6,778,624 Included in the above balances at March 31, 2021 and December 31, 2020 are certificates of deposit obtained through brokers, totaling $16.3 million and $26.3 million, respectively, that were acquired from Stewardship. The aggregate amount of certificates of deposit that meet or exceed $100,000 totaled approximately $974.7 million and $1.0 billion at March 31, 2021 and December 31, 2020, respectively. Interest expense on deposits for the three months ended March 31, 2021 and 2020 totaled $8.9 million and $16.8 million, respectively. 11. Deposits (continued) Scheduled maturities of certificates of deposit accounts at March 31, 2021 and December 31, 2020 are summarized as follows: March 31, December 31, 2021 2020 (In thousands) One year or less $ 1,457,641 $ 1,494,129 After one year to two years 286,269 337,579 After two years to three years 56,623 52,809 After three years to four years 27,548 23,018 After four years 48,575 50,831 $ 1,876,656 $ 1,958,366

Stock Based Compensation

Stock Based Compensation	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock Based Compensation	Stock Based Compensation At the Company's annual meeting of stockholders 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 common stock. On July 23, 2019, 1,389,570 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 but 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. On December 14, 2020, 33,160 shares of restricted stock were awarded, with a grant date fair value of $15.08 per share. To fund the grant of restricted common stock, the Company reissued shares from treasury stock. On March 21, 2021, 50,203 shares of restricted stock were awarded, with a grant date fair value of $17.86 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 performance or service periods ranging from 1 year to 5 years, beginning 1 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 both the three months ended March 31, 2021 and 2020, approximately $1.4 million in expense was recognized in regard to these awards. The expected future compensation expense related to the 1,299,526 non-vested restricted shares outstanding at March 31, 2021 is approximately $13.8 million over a weighted average period of 2.7 years. The following is a summary of the Company's restricted stock activity during the three months ended March 31, 2021 and 2020: Number of Restricted Shares Weighted Average Grant Date Fair Value Non-vested at January 1, 2021 1,263,169 $ 15.66 Grants 50,203 17.86 Forfeited (13,846) 15.60 Non-vested at March 31, 2021 1,299,526 $ 15.74 12. Stock Based Compensation (continued) Number of Restricted Shares Weighted Average Grant Date Fair Value Non-vested at January 1, 2020 1,420,012 $ 15.67 Forfeited (881) 15.60 Non-vested at March 31, 2020 1,419,131 $ 15.67 On July 23, 2019, options to purchase 3,707,901 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%. 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%. On March 22, 2021, options to purchase 109,654 shares of Company common stock were awarded with a grant date fair value of $4.91 per option. Stock options granted under the 2019 Plan vest in equal installments over the service period of three years beginning one year from the date of grant. Stock options were granted at an exercise price of $17.86, 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 ten years. The fair value of stock options granted was estimated utilizing the Black-Scholes option pricing model using the following assumptions: expected life of 6.0 years, risk-free rate of return of 1.11%, volatility of 25.98%, 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 became a public company and does not have sufficient historical price data, the expected volatility is based on the historical daily stock prices of Company stock plus 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, 2021 and 2020, approximately $761,000 and $798,500 in expense was recognized in regard to these awards. The expected future compensation expense related to the 3,044,866 non-vested options outstanding at March 31, 2021 is $10.9 million over a weighted average period of 3.4 years. 12. Stock Based Compensation (continued) The following is a summary of the Company's option activity during the three months ended March 31, 2021 and 2020: Number of Stock Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding, January 1, 2021 3,708,628 $ 15.66 8.6 $ — Granted 109,654 17.86 — — Expired (2,029) 15.60 — — Forfeited (30,118) 15.60 — — Outstanding, March 31, 2021 3,786,135 $ 15.73 8.4 $ 6,673,328 Options exercisable at March 31, 2021 741,269 $ 15.66 8.2 $ 1,345,897 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 Forfeited (9,707) $ 15.60 — — Outstanding, March 31, 2020 3,774,337 $ 15.67 9.3 $ — 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, 2021 and 2020.

Components of Net Periodic Bene

Components of Net Periodic Benefit Costs	3 Months Ended
	Mar. 31, 2021
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 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. Net periodic benefit (income) cost for Pension Plan, RIM Plan, Post-retirement Plan and Split-dollar Life Insurance plan benefits for the three months ended March 31, 2021 and 2020, includes the following components: 13. Components of Net Periodic Benefit Cost (continued) Three Months Ended March 31, Pension Plan RIM Plan Post-retirement Plan Split-Dollar Life Insurance 2021 2020 2021 2020 2021 2020 2021 2020 Affected Line Item in the Consolidated Statements of Income (In thousands) Service cost $ 2,150 $ 1,937 $ 100 $ 67 $ 130 $ 99 $ 141 $ 106 Compensation and employee benefits Interest cost 1,756 2,031 86 102 141 171 125 114 Other non-interest expense Expected return on plan assets (6,318) (5,737) — — — — — — Other non-interest expense Amortization: Prior service cost — — — — — — 14 14 Other non-interest expense Net loss 1,000 781 166 99 153 77 191 113 Other non-interest expense Net periodic (income) benefit cost $ (1,412) $ (988) $ 352 $ 268 $ 424 $ 347 $ 471 $ 347 For the three months ended March 31, 2021, no contribution was 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, 2021 were calculated using the most recent available benefit valuations. Through the acquisition of the Roselle entities, the Company acquired a non-contributory defined benefit supplemental executive retirement plan with the only participant being a former president of Roselle Bank. For the three months ended March 31, 2021, the Company recorded a net periodic benefit cost of $2,000 in connection with this plan.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2021
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. 14. Fair Value Measurements (continued) 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. 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 at March 31, 2021 and December 31, 2020. 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 and Federal Home Loan Mortgage Corporation ("FHLMC") and Federal National Mortgage Association ("FNMA") preferred stock are considered Level 2 instruments. In addition, Level 2 instruments include 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 stock. 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. 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 at March 31, 2021 and December 31, 2020, by level within the fair value hierarchy: March 31, 2021 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 $ 39,795 $ 39,795 $ — $ — Mortgage-backed securities and collateralized mortgage obligations 1,348,541 — 1,348,541 — Municipal obligations 16,649 — 16,649 — Corporate debt securities 64,565 — 64,565 — Trust preferred securities 4,696 — 4,696 — Total debt securities available for sale 1,474,246 39,795 1,434,451 — Equity securities 4,830 4,484 346 — Derivative assets 10,136 — 10,136 — $ 1,489,212 $ 44,279 $ 1,444,933 $ — Derivative liabilities $ 26,843 $ — $ 26,843 $ — December 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 $ 25,549 $ 25,549 $ — $ — Mortgage-backed securities and collateralized mortgage obligations 1,200,394 — 1,200,394 — Municipal obligations 16,862 — 16,862 — Corporate debt securities 69,477 — 69,477 — Trust preferred securities 4,670 — 4,670 — Total debt securities available for sale 1,316,952 25,549 1,291,403 — Equity securities 5,418 5,072 346 Derivative assets 19,425 — 19,425 — $ 1,341,795 $ 30,621 $ 1,311,174 $ — Derivative liabilities $ 42,384 $ — $ 42,384 $ — 14. Fair Value Measurements (continued) There were no Level 3 assets measured at fair value on a recurring basis at March 31, 2021 and December 31, 2020. 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 at March 31, 2021 and December 31, 2020. Impaired Loans Loans which meet certain criteria are evaluated individually for impairment. Loan impairment is measured based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral if the loan is collateral dependent. 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 on a non-recurring basis at March 31, 2021 and December 31, 2020, by level within the fair value hierarchy: March 31, 2021 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 $ 1,580 $ — $ — $ 1,580 Mortgage servicing rights 1,985 — — 1,985 $ 3,565 $ — $ — $ 3,565 December 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 1,338 — — 1,338 $ 1,338 $ — $ — $ 1,338 14. Fair Value Measurements (continued) The following table presents information for Level 3 assets measured at fair value on a non-recurring basis at March 31, 2021 and December 31, 2020: March 31, 2021 Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Weighted Average (Dollars in thousands) Impaired loans $ 1,580 Discounted cash flow Expected value of future cash flows (1) —% —% Mortgage servicing rights 1,985 Discounted cash flow Prepayment speeds and discount rates (2) 8.6% - 24.8% 13.1% December 31, 2020 Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Weighted Average (Dollars in thousands) Mortgage servicing rights 1,338 Discounted cash flow Prepayment speeds and discount rates (2) 9.7% - 26.2% 16.7% (1) Value based on management's estimate of expected future cash flows. (2) Value of SBA servicing rights based on a discount rate of 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 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. 14. Fair Value Measurements (continued) 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. 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 at March 31, 2021 and December 31, 2020: March 31, 2021 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 $ 359,716 $ 359,716 $ 359,716 $ — $ — Debt securities available for sale 1,474,246 1,474,246 39,795 1,434,451 — Debt securities held to maturity 391,264 398,906 34,502 364,404 — Equity securities 4,830 4,830 4,484 346 — Federal Home Loan Bank stock 40,280 40,280 — 40,280 — Loans receivable, net 6,152,961 6,372,104 — — 6,372,104 Derivative assets 10,136 10,136 — 10,136 — Financial liabilities: Deposits $ 6,996,330 $ 7,004,371 $ — $ 7,004,371 $ — Borrowings 722,615 729,280 — 729,280 — Derivative liabilities 26,843 26,843 — 26,843 — December 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 $ 422,957 $ 422,957 $ 422,957 $ — $ — Debt securities available for sale 1,316,952 1,316,952 25,549 1,291,403 — Debt securities held to maturity 262,720 277,091 5,001 272,090 — Equity securities 5,418 5,418 5,072 346 — Federal Home Loan Bank stock 43,759 43,759 — 43,759 — Loans receivable, net 6,107,094 6,394,524 — — 6,394,524 Derivative assets 19,425 19,425 — 19,425 — Financial liabilities: Deposits $ 6,778,624 $ 6,793,034 $ — $ 6,793,034 $ — Borrowings 799,364 808,853 — 808,853 — Derivative liabilities 42,384 42,384 — 42,384 — 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, 2021
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The following tables present the components of other comprehensive (loss) income, both gross and net of tax, for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 2020 Before Tax Tax Effect After Tax Before Tax Tax Effect After Tax (In thousands) Components of other comprehensive (loss) income: Unrealized (loss) gains on debt securities available for sale: $ (19,840) $ 2,806 $ (17,034) $ 24,383 $ (5,116) $ 19,267 Accretion of unrealized gain on debt securities reclassified as held to maturity (4) 18 14 8 (2) 6 Reclassification adjustment for gain included in net income — — — 370 (81) 289 (19,844) 2,824 (17,020) 24,761 (5,199) 19,562 Derivatives: Unrealized gain (loss) on swap contracts accounted for as cash flow hedges 5,832 (149) 5,683 (14,360) 3,011 (11,349) 5,832 (149) 5,683 (14,360) 3,011 (11,349) Employee benefit plans: Amortization of prior service cost included in net income (14) 4 (10) 42 (9) 33 Reclassification adjustment of actuarial net (loss) gain included in net income (1,511) 422 (1,089) 2,638 (554) 2,084 Change in funded status of retirement obligations 3,050 6,504 9,554 (1,595) 335 (1,260) 1,525 6,930 8,455 1,085 (228) 857 Total other comprehensive (loss) income $ (12,487) $ 9,605 $ (2,882) $ 11,486 $ (2,416) $ 9,070 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, 2021 and 2020: Three Months Ended March 31, 2021 2020 Unrealized Gains on Debt Securities Available for Sale Unrealized (Losses) on Swaps Employee Benefit Plans Accumulated Other Comprehensive (Loss) Unrealized Gains on Debt Securities Available for Sale Unrealized (Losses) on Swaps Employee Benefit Plans Accumulated Other Comprehensive (Loss) (In thousands) Balance at beginning of period $ 31,028 $ (16,856) $ (83,797) $ (69,625) $ 9,377 $ (8,474) $ (69,638) $ (68,735) Current period changes in other comprehensive income (loss) (17,020) 5,683 8,455 (2,882) 19,562 (11,349) 857 9,070 Total other comprehensive income (loss) $ 14,008 $ (11,173) $ (75,342) $ (72,507) $ 28,939 $ (19,823) $ (68,781) $ (59,665) 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, 2021 and 2020: Accumulated Other Comprehensive Income (Loss) Components Three Months Ended March 31, Affected Line Items in the Consolidated Statements of Income 2021 2020 (In thousands) Reclassification adjustment for gains included in net income $ — $ 370 Gain on securities transactions Reclassification adjustment of actuarial net (loss) gain included in net income (1,511) 2,638 Other non-interest expense Total before tax (1,511) 3,008 Income (tax) benefit 422 (635) Net of tax $ (1,089) $ 2,373

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2021
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, 2021 and December 31, 2020, the Company had no currency forward contracts in place with commercial banking customers. Interest Rate Swaps. At both March 31, 2021 and December 31, 2020, the Company had interest rate swaps in place with 48 commercial banking customers executed by offsetting interest rate swaps with third parties, with an aggregated notional amount of $175.1 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, 2021 and December 31, 2020, the Company had 29 and 31 interest rate swaps with notional amounts of $410.0 million and $430.0 million, respectively, hedging certain FHLB advances. These interest rate swaps meet the cash flow 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, 2021 and 2020, 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, 2021 and December 31, 2020: March 31, 2021 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 $ 10,136 Other Liabilities $ 26,843 Total derivative instruments $ 10,136 $ 26,843 December 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 $ 19,425 Other Liabilities $ 42,384 Total derivative instruments $ 19,425 $ 42,384 For the three months ended March 31, 2021 and 2020, (gains)/losses of $(368,000) and $426,000, respectively, were recorded for changes in fair value of interest rate swaps with third parties. At March 31, 2021 and December 31, 2020, accrued interest was $971,000 and $1.0 million, 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.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2021
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. 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, 2021 and 2020. Three Months Ended March 31, 2021 2020 (In thousands) Non-interest income In-scope of Topic 606: Demand deposit account fees $ 838 $ 1,299 Title insurance fees 1,620 1,231 Other non-interest income 1,744 1,417 Total in-scope non-interest income 4,202 3,947 Total out-of-scope non-interest income 4,393 2,444 Total non-interest income $ 8,595 $ 6,391 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.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events    The Company has evaluated events subsequent to March 31, 2021 and through the financial statement issuance date of May 10, 2021. The Company has not identified any material subsequent events that would require adjustment or disclosure in the consolidated financial statements.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements	Accounting Pronouncement Adopted in 2021 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. The amendments in this update modify the disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans by removing disclosures that no longer are considered cost beneficial, clarifying the specific requirements of disclosures, and adding disclosure requirements identified as relevant. Among other changes, the ASU adds disclosure requirements to Topic 715-20 for the weighted-average interest crediting rates for cash balance plans and other plans with promised interest crediting rates and an explanation of the reasons for significant gains and losses related to changes in benefit obligation for the period. The amendments remove disclosure requirements for the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year, the amount and timing of plan assets expected to be returned to the employer, and the effects of a one-percentage-point change in assumed health care cost trend rates on the (a) aggregate of the service and interest cost components of net periodic benefit costs and (b) benefit obligation for post-retirement health care benefits. ASU 2018-14 is effective for fiscal years beginning after December 15, 2020, including interim reporting periods within that reporting period, with early adoption permitted. The Company adopted this ASU effective January 1, 2021. The update will be applied on a retrospective basis to disclosures with regard to employee benefit plans. The adoption of this update did not have a significant impact on the Company's consolidated financial statements. 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 until December 31, 2020 as permitted by the enacted Coronavirus Aid, Relief and Economic Security Act ("CARES Act"). In late December 2020, the Consolidated Appropriations Act, 2021 was enacted, and extended certain provisions of the CARES Act, which allowed the Company to extend the adoption of CECL until January 1, 2022. The Company elected to extend its adoption of CECL in accordance with recent legislation, and 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: 5. Summary of Significant Accounting Policies Accounting Pronouncements Not Yet Adopted (continued) • 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, 2021, we currently expect the adoption of ASU 2016-13 will result in a decrease between 15% and 25% 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 decrease 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.
Fair Value Measurements	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 and Federal Home Loan Mortgage Corporation ("FHLMC") and Federal National Mortgage Association ("FNMA") preferred stock are considered Level 2 instruments. In addition, Level 2 instruments include 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 stock. 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. Impaired Loans Loans which meet certain criteria are evaluated individually for impairment. Loan impairment is measured based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral if the loan is collateral dependent. 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. 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 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. 14. Fair Value Measurements (continued) 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. 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 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.

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Schedule of recognized identified assets acquired and liabilities assumed	The following table sets forth assets acquired and liabilities assumed in the Roselle acquisition, at their estimated fair values as of the closing date of the transaction: April 1, 2020 (In thousands) Assets acquired: Cash and cash equivalents $ 155,248 Debt securities available for sale 51,479 Debt securities held to maturity 13,418 Equity securities 1,796 Federal Home Loan Bank stock 2,010 Loans receivable 171,593 Accrued interest receivable 679 Office properties and equipment, net 5,774 Bank-owned life insurance 17,245 Deferred tax asset, net 1,334 Other assets 1,489 Total assets acquired $ 422,065 Liabilities assumed: Deposits $ 333,234 Borrowings 37,728 Advance payments by borrowers for taxes and insurance 982 Accrued expenses and other liabilities 5,400 Total liabilities assumed $ 377,344 Net assets acquired 44,721 Fair market value of stock issued to Columbia Bank MHC for purchase 68,530 Goodwill recorded at merger $ 23,809

Earnings per Share (Tables)

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and 2020: Three Months Ended March 31, 2021 2020 (Dollars in thousands, except per share data) Net income $ 21,045 $ 6,765 Shares: Weighted average shares outstanding - basic 105,977,621 108,438,173 Weighted average dilutive shares outstanding — — Weighted average shares outstanding - diluted 105,977,621 108,438,173 Earnings per share: Basic $ 0.20 $ 0.06 Diluted $ 0.20 $ 0.06

Debt Securities Available for_2

Debt Securities Available for Sale (Tables)	3 Months Ended
	Mar. 31, 2021
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	Debt securities available for sale at March 31, 2021 and December 31, 2020 are summarized as follows: March 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 39,008 $ 942 $ (155) $ 39,795 Mortgage-backed securities and collateralized mortgage obligations 1,331,338 26,471 (9,268) 1,348,541 Municipal obligations 16,633 16 — 16,649 Corporate debt securities 62,667 2,212 (314) 64,565 Trust preferred securities 5,000 — (304) 4,696 $ 1,454,646 $ 29,641 $ (10,041) $ 1,474,246 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 24,425 $ 1,124 $ — $ 25,549 Mortgage-backed securities and collateralized mortgage obligations 1,163,613 37,343 (562) 1,200,394 Municipal obligations 16,845 17 — 16,862 Corporate debt securities 67,628 2,264 (415) 69,477 Trust preferred securities 5,000 — (330) 4,670 $ 1,277,511 $ 40,748 $ (1,307) $ 1,316,952
Schedule of securities by contractual maturity	The amortized cost and fair value of debt securities available for sale at March 31, 2021, 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, 2021 Amortized Cost Fair Value (In thousands) One year or less $ 16,168 $ 16,168 More than one year to five years 60,123 61,736 More than five years to ten years 47,017 47,801 $ 123,308 $ 125,705 Mortgage-backed securities and collateralized mortgage obligations 1,331,338 1,348,541 $ 1,454,646 $ 1,474,246 The amortized cost and fair value of debt held to maturity at March 31, 2021, 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, 2021 Amortized Cost Fair Value (In thousands) More than one year to five years $ 15,000 $ 14,969 More than five years to ten years 19,995 19,533 34,995 34,502 Mortgage-backed securities and collateralized mortgage obligations 356,269 364,404 $ 391,264 $ 398,906
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, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2021 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 $ 14,530 $ (155) $ — $ — $ 14,530 $ (155) Mortgage-backed securities and collateralized mortgage obligations 431,061 (9,241) 9,898 (27) 440,959 (9,268) Corporate debt securities 4,846 (154) 4,840 (160) 9,686 (314) Trust preferred securities — — 4,697 (304) 4,697 (304) $ 450,437 $ (9,550) $ 19,435 $ (491) $ 469,872 $ (10,041) December 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 $ 117,978 $ (481) $ 24,018 $ (81) $ 141,996 $ (562) Corporate debt securities 9,845 (155) 5,740 (260) 15,585 (415) Trust preferred securities — — 4,670 (330) 4,670 (330) $ 127,823 $ (636) $ 34,428 $ (671) $ 162,251 $ (1,307)

Debt Securities Held to Matur_2

Debt Securities Held to Maturity (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and December 31, 2020 are summarized as follows: March 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 34,995 $ — $ (493) $ 34,502 Mortgage-backed securities and collateralized mortgage obligations 356,269 8,899 (764) 364,404 $ 391,264 $ 8,899 $ (1,257) $ 398,906 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 5,000 $ 1 $ — $ 5,001 Mortgage-backed securities and collateralized mortgage obligations 257,720 14,372 (2) 272,090 $ 262,720 $ 14,373 $ (2) $ 277,091
Schedule of securities by contractual maturity	The amortized cost and fair value of debt securities available for sale at March 31, 2021, 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, 2021 Amortized Cost Fair Value (In thousands) One year or less $ 16,168 $ 16,168 More than one year to five years 60,123 61,736 More than five years to ten years 47,017 47,801 $ 123,308 $ 125,705 Mortgage-backed securities and collateralized mortgage obligations 1,331,338 1,348,541 $ 1,454,646 $ 1,474,246 The amortized cost and fair value of debt held to maturity at March 31, 2021, 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, 2021 Amortized Cost Fair Value (In thousands) More than one year to five years $ 15,000 $ 14,969 More than five years to ten years 19,995 19,533 34,995 34,502 Mortgage-backed securities and collateralized mortgage obligations 356,269 364,404 $ 391,264 $ 398,906
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, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: March 31, 2021 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 $ 34,502 $ (493) $ — $ — $ 34,502 $ (493) Mortgage-backed securities and collateralized mortgage obligations 77,010 (764) — — 77,010 (764) $ 111,512 $ (1,257) $ — $ — $ 111,512 $ (1,257) December 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 $ 2,176 $ (2) $ — $ — $ 2,176 $ (2)

Loans Receivable and Allowanc_2

Loans Receivable and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Schedule of loans receivable	Loans receivable at March 31, 2021 and December 31, 2020 are summarized as follows: March 31, December 31, 2021 2020 (In thousands) Real estate loans: One-to-four family $ 1,877,131 $ 1,940,327 Multifamily and commercial 2,873,586 2,817,965 Construction 338,001 328,711 Commercial business loans 825,469 752,870 Consumer loans: Home equity loans and advances 294,230 321,177 Other consumer loans 1,181 1,497 Total gross loans 6,209,598 6,162,547 Purchased credit-impaired loans 6,230 6,345 Net deferred loan costs, fees and purchased premiums and discounts 9,037 12,878 Loans receivable $ 6,224,865 $ 6,181,770
Schedule of aging of loans receivable by portfolio segment	The following tables summarize the aging of loans receivable by portfolio segment, including non-accrual loans and excluding PCI loans at March 31, 2021 and December 31, 2020: March 31, 2021 30-59 Days 60-89 Days 90 Days or More Total Past Due Non-accrual Current Total (In thousands) Real estate loans: One-to-four family $ 1,542 $ 367 $ 1,204 $ 3,113 $ 2,097 $ 1,871,921 $ 1,877,131 Multifamily and commercial 4,027 — 1,238 5,265 1,864 2,866,457 2,873,586 Construction — — — — — 338,001 338,001 Commercial business loans 1,836 — 1,292 3,128 1,790 820,551 825,469 Consumer loans: Home equity loans and advances 520 132 253 905 403 292,922 294,230 Other consumer loans 4 — — 4 — 1,177 1,181 Total loans $ 7,929 $ 499 $ 3,987 $ 12,415 $ 6,154 $ 6,191,029 $ 6,209,598 December 31, 2020 30-59 Days 60-89 Days 90 Days or More Total Past Due Non-accrual Current Total (In thousands) Real estate loans: One-to-four family $ 3,068 $ 912 $ 1,901 $ 5,881 $ 2,637 $ 1,931,809 $ 1,940,327 Multifamily and commercial 15,645 — 1,238 16,883 1,873 2,799,209 2,817,965 Construction 550 — — 550 — 328,161 328,711 Commercial business loans 2,343 1,056 2,453 5,852 2,968 744,050 752,870 Consumer loans: Home equity loans and advances 1,156 696 394 2,246 678 318,253 321,177 Other consumer loans 4 — — 4 — 1,493 1,497 Total loans $ 22,766 $ 2,664 $ 5,986 $ 31,416 $ 8,156 $ 6,122,975 $ 6,162,547
Schedule of PCI Loans Acquired	The following table presents changes in accretable yield for PCI loans for the three months ended March 31, 2021 and 2020. March 31, 2021 2020 (In thousands) Balance at beginning of period $ 418 $ 511 Accretion (32) (49) Net change in expected cash flows 22 1 Balance at end of period $ 408 $ 463
Schedule of loans receivable by portfolio segment and impairment method	The following tables summarize loans receivable (including PCI loans) and allowance for loan losses by portfolio segment and impairment method at March 31, 2021 and December 31, 2020: March 31, 2021 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 $ 290 $ 78 $ — $ 360 $ 12 $ — $ 740 Collectively evaluated for impairment 19,560 23,771 11,464 14,444 1,919 6 71,164 Loans acquired with deteriorated credit quality — — — — — — — Total $ 19,850 $ 23,849 $ 11,464 $ 14,804 $ 1,931 $ 6 $ 71,904 Total loans: Individually evaluated for impairment $ 6,630 $ 32,533 $ — $ 2,467 $ 1,570 $ — $ 43,200 Collectively evaluated for impairment 1,870,501 2,841,053 338,001 823,002 292,660 1,181 6,166,398 Loans acquired with deteriorated credit quality 301 4,852 — 1,077 — — 6,230 Total loans $ 1,877,432 $ 2,878,438 $ 338,001 $ 826,546 $ 294,230 $ 1,181 $ 6,215,828 9. Loans Receivable and Allowance for Loan Losses (continued) December 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 $ 391 $ 601 $ — $ 84 $ 12 $ — $ 1,088 Collectively evaluated for impairment 13,195 30,080 11,271 17,300 1,736 6 73,588 Loans acquired with deteriorated credit quality — — — — — — — Total $ 13,586 $ 30,681 $ 11,271 $ 17,384 $ 1,748 $ 6 $ 74,676 Total loans: Individually evaluated for impairment $ 7,257 $ 32,792 $ — $ 3,447 $ 1,651 $ — $ 45,147 Collectively evaluated for impairment 1,933,070 2,785,173 328,711 749,423 319,526 1,497 6,117,400 Loans acquired with deteriorated credit quality 309 4,893 — 1,143 — — 6,345 Total loans $ 1,940,636 $ 2,822,858 $ 328,711 $ 754,013 $ 321,177 $ 1,497 $ 6,168,892 The activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2021 and 2020 are as follows: Three Months Ended March 31, One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) 2021 Balance at beginning of period $ 13,586 $ 30,681 $ 11,271 $ 17,384 $ 1,748 $ 6 $ 74,676 Provision charged (credited) 6,477 (6,672) 192 (1,509) 230 2 (1,280) Recoveries 3 6 1 16 11 — 37 Charge-offs (216) (166) — (1,087) (58) (2) (1,529) Balance at end of period $ 19,850 $ 23,849 $ 11,464 $ 14,804 $ 1,931 $ 6 $ 71,904 2020 Balance at beginning of period $ 13,780 $ 22,980 $ 7,435 $ 15,836 $ 1,669 $ 9 $ 61,709 Provision charged 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
Schedule of troubled debt restructuring	The following tables present the number of loans modified as TDRs during the three months ended March 31, 2021 and 2020, 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. Three Months Ended March 31, 2021 2020 No. of Loans Pre-modification Recorded Investment Post-modification Recorded Investment No. of Loans Pre-modification Recorded Investment Post-modification Recorded Investment (Dollars in thousands) Troubled Debt Restructurings Real Estate loans: Multifamily and commercial — $ — $ — 1 $ 10,212 $ 11,507 Total restructured loans — $ — $ — 1 $ 10,212 $ 11,507
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, 2021 and December 31, 2020: At March 31, 2021 Recorded Investment Unpaid Principal Balance Specific Allowance (In thousands) With no allowance recorded: Real estate loans: One-to-four family $ 2,845 $ 3,385 $ — Multifamily and commercial 14,879 15,694 — Commercial business loans 643 643 — Consumer loans: Home equity loans and advances 611 743 — 18,978 20,465 — With a specific allowance recorded: Real estate loans: One-to-four family 3,785 3,803 290 Multifamily and commercial 17,654 17,657 78 Commercial business loans 1,824 2,780 360 Consumer loans: Home equity loans and advances 959 959 12 24,222 25,199 740 Total: Real estate loans: One-to-four family 6,630 7,188 290 Multifamily and commercial 32,533 33,351 78 Commercial business loans 2,467 3,423 360 Consumer loans: Home equity loans and advances 1,570 1,702 12 Total loans $ 43,200 $ 45,664 $ 740 9. Loans Receivable and Allowance for Loan Losses (continued) At December 31, 2020 Recorded Investment Unpaid Principal Balance Specific Allowance (In thousands) With no allowance recorded: Real estate loans: One-to-four family $ 3,344 $ 3,898 $ — Multifamily and commercial 13,058 13,094 — Commercial business loans 1,945 1,945 — Consumer loans: Home equity loans and advances 714 851 — 19,061 19,788 — With a specific allowance recorded: Real estate loans: One-to-four family 3,913 3,919 391 Multifamily and commercial 19,734 20,350 601 Commercial business loans 1,502 1,502 84 Consumer loans: Home equity loans and advances 937 937 12 26,086 26,708 1,088 Total: Real estate loans: One-to-four family 7,257 7,817 391 Multifamily and commercial 32,792 33,444 601 Commercial business loans 3,447 3,447 84 Consumer loans: Home equity loans and advances 1,651 1,788 12 $ 45,147 $ 46,496 $ 1,088 Three Months Ended March 31, 2021 2020 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (In thousands) Real estate loans: One-to-four family $ 6,944 $ 74 $ 8,688 $ 99 Multifamily and commercial 32,663 425 8,780 166 Commercial business loans 2,957 29 5,814 72 Consumer loans: Home equity loans and advances 1,611 22 2,130 30 Total loans $ 44,175 $ 550 $ 25,412 $ 367
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, 2021 and December 31, 2020: March 31, 2021 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Pass $ 1,870,683 $ 2,803,914 $ 338,001 $ 814,629 $ 293,534 $ 1,181 $ 6,121,942 Special mention 399 51,121 — 6,192 — — 57,712 Substandard 6,049 18,551 — 4,648 696 — 29,944 Doubtful — — — — — — — Loss — — — — — — — Total $ 1,877,131 $ 2,873,586 $ 338,001 $ 825,469 $ 294,230 $ 1,181 $ 6,209,598 9. Loans Receivable and Allowance for Loan Losses (continued) December 31, 2020 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Pass $ 1,935,032 $ 2,758,905 $ 328,711 $ 740,010 $ 320,092 $ 1,497 $ 6,084,247 Special mention 404 40,392 — 6,718 — — 47,514 Substandard 4,891 18,668 — 6,142 1,085 — 30,786 Doubtful — — — — — — — Loss — — — — — — — Total $ 1,940,327 $ 2,817,965 $ 328,711 $ 752,870 $ 321,177 $ 1,497 $ 6,162,547

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 Lease Payment Obligations (In thousands) 2021 $ 3,081 2022 3,827 2023 3,437 2024 2,712 2025 2,041 Thereafter 6,709 Total undiscounted cash flows 21,807 Discount on cash flows (1,903) Total lease liability $ 19,904

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2021
Deposits [Abstract]
Schedule of Deposits	Deposits at March 31, 2021 and December 31, 2020 are summarized as follows: March 31, December 31, 2021 2020 (In thousands) Non-interest-bearing demand $ 1,489,511 $ 1,354,605 Interest-bearing demand 2,276,501 2,189,164 Money market accounts 621,064 588,180 Savings and club deposits 732,598 688,309 Certificates of deposit 1,876,656 1,958,366 Total deposits $ 6,996,330 $ 6,778,624
Schedule of Certificate Accounts by Maturity	Scheduled maturities of certificates of deposit accounts at March 31, 2021 and December 31, 2020 are summarized as follows: March 31, December 31, 2021 2020 (In thousands) One year or less $ 1,457,641 $ 1,494,129 After one year to two years 286,269 337,579 After two years to three years 56,623 52,809 After three years to four years 27,548 23,018 After four years 48,575 50,831 $ 1,876,656 $ 1,958,366

Stock Based Compensation (Table

Stock Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and 2020: Number of Restricted Shares Weighted Average Grant Date Fair Value Non-vested at January 1, 2021 1,263,169 $ 15.66 Grants 50,203 17.86 Forfeited (13,846) 15.60 Non-vested at March 31, 2021 1,299,526 $ 15.74 12. Stock Based Compensation (continued) Number of Restricted Shares Weighted Average Grant Date Fair Value Non-vested at January 1, 2020 1,420,012 $ 15.67 Forfeited (881) 15.60 Non-vested at 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 during the three months ended March 31, 2021 and 2020: Number of Stock Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding, January 1, 2021 3,708,628 $ 15.66 8.6 $ — Granted 109,654 17.86 — — Expired (2,029) 15.60 — — Forfeited (30,118) 15.60 — — Outstanding, March 31, 2021 3,786,135 $ 15.73 8.4 $ 6,673,328 Options exercisable at March 31, 2021 741,269 $ 15.66 8.2 $ 1,345,897 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 Forfeited (9,707) $ 15.60 — — Outstanding, March 31, 2020 3,774,337 $ 15.67 9.3 $ — Options exercisable at March 31, 2020 — $ — — $ —

Components of Net Periodic Be_2

Components of Net Periodic Benefit Costs (Tables)	3 Months Ended
	Mar. 31, 2021
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 plan benefits for the three months ended March 31, 2021 and 2020, includes the following components: 13. Components of Net Periodic Benefit Cost (continued) Three Months Ended March 31, Pension Plan RIM Plan Post-retirement Plan Split-Dollar Life Insurance 2021 2020 2021 2020 2021 2020 2021 2020 Affected Line Item in the Consolidated Statements of Income (In thousands) Service cost $ 2,150 $ 1,937 $ 100 $ 67 $ 130 $ 99 $ 141 $ 106 Compensation and employee benefits Interest cost 1,756 2,031 86 102 141 171 125 114 Other non-interest expense Expected return on plan assets (6,318) (5,737) — — — — — — Other non-interest expense Amortization: Prior service cost — — — — — — 14 14 Other non-interest expense Net loss 1,000 781 166 99 153 77 191 113 Other non-interest expense Net periodic (income) benefit cost $ (1,412) $ (988) $ 352 $ 268 $ 424 $ 347 $ 471 $ 347

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
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 at March 31, 2021 and December 31, 2020, by level within the fair value hierarchy: March 31, 2021 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 $ 39,795 $ 39,795 $ — $ — Mortgage-backed securities and collateralized mortgage obligations 1,348,541 — 1,348,541 — Municipal obligations 16,649 — 16,649 — Corporate debt securities 64,565 — 64,565 — Trust preferred securities 4,696 — 4,696 — Total debt securities available for sale 1,474,246 39,795 1,434,451 — Equity securities 4,830 4,484 346 — Derivative assets 10,136 — 10,136 — $ 1,489,212 $ 44,279 $ 1,444,933 $ — Derivative liabilities $ 26,843 $ — $ 26,843 $ — December 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 $ 25,549 $ 25,549 $ — $ — Mortgage-backed securities and collateralized mortgage obligations 1,200,394 — 1,200,394 — Municipal obligations 16,862 — 16,862 — Corporate debt securities 69,477 — 69,477 — Trust preferred securities 4,670 — 4,670 — Total debt securities available for sale 1,316,952 25,549 1,291,403 — Equity securities 5,418 5,072 346 Derivative assets 19,425 — 19,425 — $ 1,341,795 $ 30,621 $ 1,311,174 $ — Derivative liabilities $ 42,384 $ — $ 42,384 $ —
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 on a non-recurring basis at March 31, 2021 and December 31, 2020, by level within the fair value hierarchy: March 31, 2021 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 $ 1,580 $ — $ — $ 1,580 Mortgage servicing rights 1,985 — — 1,985 $ 3,565 $ — $ — $ 3,565 December 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 1,338 — — 1,338 $ 1,338 $ — $ — $ 1,338
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 at March 31, 2021 and December 31, 2020: March 31, 2021 Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Weighted Average (Dollars in thousands) Impaired loans $ 1,580 Discounted cash flow Expected value of future cash flows (1) —% —% Mortgage servicing rights 1,985 Discounted cash flow Prepayment speeds and discount rates (2) 8.6% - 24.8% 13.1% December 31, 2020 Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Weighted Average (Dollars in thousands) Mortgage servicing rights 1,338 Discounted cash flow Prepayment speeds and discount rates (2) 9.7% - 26.2% 16.7% (1) Value based on management's estimate of expected future cash flows. (2) Value of SBA servicing rights based on a discount rate of 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 at March 31, 2021 and December 31, 2020: March 31, 2021 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 $ 359,716 $ 359,716 $ 359,716 $ — $ — Debt securities available for sale 1,474,246 1,474,246 39,795 1,434,451 — Debt securities held to maturity 391,264 398,906 34,502 364,404 — Equity securities 4,830 4,830 4,484 346 — Federal Home Loan Bank stock 40,280 40,280 — 40,280 — Loans receivable, net 6,152,961 6,372,104 — — 6,372,104 Derivative assets 10,136 10,136 — 10,136 — Financial liabilities: Deposits $ 6,996,330 $ 7,004,371 $ — $ 7,004,371 $ — Borrowings 722,615 729,280 — 729,280 — Derivative liabilities 26,843 26,843 — 26,843 — December 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 $ 422,957 $ 422,957 $ 422,957 $ — $ — Debt securities available for sale 1,316,952 1,316,952 25,549 1,291,403 — Debt securities held to maturity 262,720 277,091 5,001 272,090 — Equity securities 5,418 5,418 5,072 346 — Federal Home Loan Bank stock 43,759 43,759 — 43,759 — Loans receivable, net 6,107,094 6,394,524 — — 6,394,524 Derivative assets 19,425 19,425 — 19,425 — Financial liabilities: Deposits $ 6,778,624 $ 6,793,034 $ — $ 6,793,034 $ — Borrowings 799,364 808,853 — 808,853 — Derivative liabilities 42,384 42,384 — 42,384 —

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Schedule of Other Comprehensive Income (Loss)	The following tables present the components of other comprehensive (loss) income, both gross and net of tax, for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 2020 Before Tax Tax Effect After Tax Before Tax Tax Effect After Tax (In thousands) Components of other comprehensive (loss) income: Unrealized (loss) gains on debt securities available for sale: $ (19,840) $ 2,806 $ (17,034) $ 24,383 $ (5,116) $ 19,267 Accretion of unrealized gain on debt securities reclassified as held to maturity (4) 18 14 8 (2) 6 Reclassification adjustment for gain included in net income — — — 370 (81) 289 (19,844) 2,824 (17,020) 24,761 (5,199) 19,562 Derivatives: Unrealized gain (loss) on swap contracts accounted for as cash flow hedges 5,832 (149) 5,683 (14,360) 3,011 (11,349) 5,832 (149) 5,683 (14,360) 3,011 (11,349) Employee benefit plans: Amortization of prior service cost included in net income (14) 4 (10) 42 (9) 33 Reclassification adjustment of actuarial net (loss) gain included in net income (1,511) 422 (1,089) 2,638 (554) 2,084 Change in funded status of retirement obligations 3,050 6,504 9,554 (1,595) 335 (1,260) 1,525 6,930 8,455 1,085 (228) 857 Total other comprehensive (loss) income $ (12,487) $ 9,605 $ (2,882) $ 11,486 $ (2,416) $ 9,070
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, 2021 and 2020: Three Months Ended March 31, 2021 2020 Unrealized Gains on Debt Securities Available for Sale Unrealized (Losses) on Swaps Employee Benefit Plans Accumulated Other Comprehensive (Loss) Unrealized Gains on Debt Securities Available for Sale Unrealized (Losses) on Swaps Employee Benefit Plans Accumulated Other Comprehensive (Loss) (In thousands) Balance at beginning of period $ 31,028 $ (16,856) $ (83,797) $ (69,625) $ 9,377 $ (8,474) $ (69,638) $ (68,735) Current period changes in other comprehensive income (loss) (17,020) 5,683 8,455 (2,882) 19,562 (11,349) 857 9,070 Total other comprehensive income (loss) $ 14,008 $ (11,173) $ (75,342) $ (72,507) $ 28,939 $ (19,823) $ (68,781) $ (59,665)
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, 2021 and 2020: Accumulated Other Comprehensive Income (Loss) Components Three Months Ended March 31, Affected Line Items in the Consolidated Statements of Income 2021 2020 (In thousands) Reclassification adjustment for gains included in net income $ — $ 370 Gain on securities transactions Reclassification adjustment of actuarial net (loss) gain included in net income (1,511) 2,638 Other non-interest expense Total before tax (1,511) 3,008 Income (tax) benefit 422 (635) Net of tax $ (1,089) $ 2,373

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and December 31, 2020: March 31, 2021 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 $ 10,136 Other Liabilities $ 26,843 Total derivative instruments $ 10,136 $ 26,843 December 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 $ 19,425 Other Liabilities $ 42,384 Total derivative instruments $ 19,425 $ 42,384

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and 2020. Three Months Ended March 31, 2021 2020 (In thousands) Non-interest income In-scope of Topic 606: Demand deposit account fees $ 838 $ 1,299 Title insurance fees 1,620 1,231 Other non-interest income 1,744 1,417 Total in-scope non-interest income 4,202 3,947 Total out-of-scope non-interest income 4,393 2,444 Total non-interest income $ 8,595 $ 6,391

Basis of Financial Statement _2

Basis of Financial Statement Presentation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash (used in) investing activities	$ (343,486)	$ (36,149)
Net cash provided by (used in) operating activities	$ (172,335)	8,454
Revision of Prior Period, Reclassification, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash (used in) investing activities		51,600
Net cash provided by (used in) operating activities		$ 51,600

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details)	Apr. 01, 2020USD ($)shares	Nov. 01, 2019USD ($)branch$ / shares	Mar. 31, 2021USD ($)branch	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)
Business Acquisition [Line Items]
Merger-related expenses			$ 0		$ 1,075,000
Branch closures
Business Acquisition [Line Items]
Number of branches closed | branch			4
Loss on branch closures			$ 770,000
Stewardship Financial Corporation
Business Acquisition [Line Items]
Number of stores | branch		12
Stewardship Financial Corporation
Business Acquisition [Line Items]
Business acquisition, share price (in dollars per share) | $ / shares		$ 15.75
Payments to acquire businesses, gross		$ 136,300,000
Merger-related expenses			0		962,000
Roselle Entities
Business Acquisition [Line Items]
Merger-related expenses			0		$ 112,000
Business acquisition, equity interest issued or issuable (in shares) | shares	4,759,048
Goodwill	$ 23,809,000		17,600,000
Business combination, provisional information, initial accounting incomplete, adjustment, deferred tax assets			$ 1,100,000	$ 5,100,000

Acquisitions - Assets Acquired

Acquisitions - Assets Acquired and Liabilities Assumed in Roselle Acquisition (Details) - Roselle Entities - USD ($) $ in Thousands	Apr. 01, 2020	Mar. 31, 2021
Assets acquired:
Cash and cash equivalents	$ 155,248
Debt securities available for sale	51,479
Debt securities held to maturity	13,418
Equity securities	1,796
Federal Home Loan Bank stock	2,010
Loans receivable	171,593
Accrued interest receivable	679
Office properties and equipment, net	5,774
Bank-owned life insurance	17,245
Deferred tax asset, net	1,334
Other assets	1,489
Total assets acquired	422,065
Liabilities assumed:
Deposits	333,234
Borrowings	37,728
Advance payments by borrowers for taxes and insurance	982
Accrued expenses and other liabilities	5,400
Total liabilities assumed	377,344
Net assets acquired	44,721
Fair market value of stock issued to Columbia Bank MHC for purchase	68,530
Goodwill	$ 23,809	$ 17,600

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 21,045	$ 6,765
Shares:
Weighted average shares outstanding - basic (in shares)	105,977,621	108,438,173
Effect of dilutive common stock equivalents (in shares)	0	0
Weighted average shares outstanding - diluted (in shares)	105,977,621	108,438,173
Earnings per share:
Basic (in dollars per share)	$ 0.20	$ 0.06
Diluted (in dollars per share)	$ 0.20	$ 0.06
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	468,156	811,853

Stock Repurchase Program (Detai

Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 01, 2021	Sep. 10, 2020	Dec. 05, 2019	Jun. 13, 2019	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Stock repurchase program, number of shares authorized to be repurchased (in shares)	5,000,000	5,000,000		4,000,000
Stock repurchase program, percent of common stock	4.50%	4.30%		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)					1,998,539	2,557,126
Shares repurchased, value					$ 32,837	$ 40,363
Shares repurchased, price per share (in dollars per share)					$ 16.43	$ 15.78

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Narrative (Details) - ASU 2016-13 - Forecast	9 Months Ended
	Jan. 01, 2022
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing receivable, allowance for credit loss, period increase (decrease), percent	15.00%
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing receivable, allowance for credit loss, period increase (decrease), percent	25.00%

Debt Securities Available for_3

Debt Securities Available for Sale - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,454,646	$ 1,277,511
Gross Unrealized Gains	29,641	40,748
Gross Unrealized (Losses)	(10,041)	(1,307)
Debt securities available for sale, at fair value	1,474,246	1,316,952
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	39,008	24,425
Gross Unrealized Gains	942	1,124
Gross Unrealized (Losses)	(155)	0
Debt securities available for sale, at fair value	39,795	25,549
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,331,338	1,163,613
Gross Unrealized Gains	26,471	37,343
Gross Unrealized (Losses)	(9,268)	(562)
Debt securities available for sale, at fair value	1,348,541	1,200,394
Municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,633	16,845
Gross Unrealized Gains	16	17
Gross Unrealized (Losses)	0	0
Debt securities available for sale, at fair value	16,649	16,862
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	62,667	67,628
Gross Unrealized Gains	2,212	2,264
Gross Unrealized (Losses)	(314)	(415)
Debt securities available for sale, at fair value	64,565	69,477
Trust preferred securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,000	5,000
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(304)	(330)
Debt securities available for sale, at fair value	$ 4,696	$ 4,670

Debt Securities Available for_4

Debt Securities Available for Sale - Expected Maturities of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Amortized Cost	$ 1,454,646	$ 1,277,511
Fair Value
Fair Value	1,474,246	1,316,952
Debt Securities excluding Mortgage-based securities and CMOs
Amortized Cost
One year or less	16,168
More than one year to five years	60,123
More than five years to ten years	47,017
Amortized Cost	123,308
Fair Value
One year or less	16,168
More than one year to five years	61,736
More than five years to ten years	47,801
Fair Value	125,705
Mortgage-backed securities and collateralized mortgage obligations
Amortized Cost
Amortized Cost	1,331,338	1,163,613
Fair Value
Fair Value	$ 1,348,541	$ 1,200,394

Debt Securities Available for_5

Debt Securities Available for Sale - Narrative (Details)	3 Months Ended
	Mar. 31, 2021USD ($)security	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)security
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,454,646,000		$ 1,277,511,000
Debt securities available for sale, at fair value	1,474,246,000		1,316,952,000
Proceeds from sales of debt securities available for sale	$ 0	$ 20,761,000
Number of debt securities called | security	1
Proceeds from calls of debt securities available for sale	$ 5,000,000	1,100,000
Gross gains on sale of available-for-sale securities	$ 0	369,000
Debt securities, available-for-sale, number of mature debt securities | security	2
Sale and maturity of debt securities, available-for-sale	$ 210,000	635,000
Gross losses on sale of available-for-sale securities		0
Calls of debt securities, available-for-sale, realized gain		1,000
Calls of debt securities, available-for-sale, unrealized loss		0
Debt securities, available-for-sale, restricted	$ 788,000,000		$ 822,200,000
Number of securities in unrealized loss position | security	72		40
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	1,331,338,000		$ 1,163,613,000
Debt securities available for sale, at fair value	$ 1,348,541,000		$ 1,200,394,000

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, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 450,437	$ 127,823
Less than 12 months, gross unrealized (losses)	(9,550)	(636)
12 months or longer, fair value	19,435	34,428
12 months or longer, gross unrealized (losses)	(491)	(671)
Fair value	469,872	162,251
Gross unrealized (losses)	(10,041)	(1,307)
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	14,530
Less than 12 months, gross unrealized (losses)	(155)
12 months or longer, fair value	0
12 months or longer, gross unrealized (losses)	0
Fair value	14,530
Gross unrealized (losses)	(155)
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	431,061	117,978
Less than 12 months, gross unrealized (losses)	(9,241)	(481)
12 months or longer, fair value	9,898	24,018
12 months or longer, gross unrealized (losses)	(27)	(81)
Fair value	440,959	141,996
Gross unrealized (losses)	(9,268)	(562)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	4,846	9,845
Less than 12 months, gross unrealized (losses)	(154)	(155)
12 months or longer, fair value	4,840	5,740
12 months or longer, gross unrealized (losses)	(160)	(260)
Fair value	9,686	15,585
Gross unrealized (losses)	(314)	(415)
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	4,697	4,670
12 months or longer, gross unrealized (losses)	(304)	(330)
Fair value	4,697	4,670
Gross unrealized (losses)	$ (304)	$ (330)

Debt Securities Held to Matur_3

Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 391,264	$ 262,720
Gross unrealized gains	8,899	14,373
Gross unrealized (losses)	(1,257)	(2)
Fair value	398,906	277,091
U.S. government and agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	34,995	5,000
Gross unrealized gains	0	1
Gross unrealized (losses)	(493)	0
Fair value	34,502	5,001
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	356,269	257,720
Gross unrealized gains	8,899	14,372
Gross unrealized (losses)	(764)	(2)
Fair value	$ 364,404	$ 272,090

Debt Securities Held to Matur_4

Debt Securities Held to Maturity - Expected Maturities of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Amortized cost	$ 391,264	$ 262,720
Fair Value
Fair Value	398,906	277,091
Debt Securities excluding Mortgage-based securities and CMOs
Amortized Cost
More than one year to five years	15,000
More than five years to ten years	19,995
Amortized cost	34,995
Fair Value
More than one year to five years	14,969
More than five years to ten years	19,533
Fair Value	34,502
Mortgage-backed securities and collateralized mortgage obligations
Amortized Cost
Amortized cost	356,269	257,720
Fair Value
Fair Value	$ 364,404	$ 272,090

Debt Securities Held to Matur_5

Debt Securities Held to Maturity - Narrative (Details)	3 Months Ended
	Mar. 31, 2021USD ($)security	Mar. 31, 2020USD ($)security	Dec. 31, 2020USD ($)security
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	$ 391,264,000		$ 262,720,000
Fair value	398,906,000		277,091,000
Proceeds from sale of held-to-maturity securities	$ 0	$ 0
Debt securities, held-to-maturity, number of debt securities called | security	1	1
Proceeds from sale and maturity of held-to-maturity securities	$ 5,000,000	$ 10,000,000
Debt securities, held-to-maturity, sold, realized gain (loss)	0	0
Fair value of securities sold under agreements to repurchase	$ 212,600,000		$ 220,500,000
Number of positions | security	15		2
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	356,269,000		$ 257,720,000
Fair value	$ 364,404,000		$ 272,090,000

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, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	$ 111,512
Less than 12 months, Gross unrealized (losses)	(1,257)
12 months or longer, Fair value	0
12 months or longer, Gross unrealized (losses)	0
Total, Fair value	111,512
Total, Gross unrealized (losses)	(1,257)
U.S. government and agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	34,502
Less than 12 months, Gross unrealized (losses)	(493)
12 months or longer, Fair value	0
12 months or longer, Gross unrealized (losses)	0
Total, Fair value	34,502
Total, Gross unrealized (losses)	(493)
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	77,010	$ 2,176
Less than 12 months, Gross unrealized (losses)	(764)	(2)
12 months or longer, Fair value	0	0
12 months or longer, Gross unrealized (losses)	0	0
Total, Fair value	77,010	2,176
Total, Gross unrealized (losses)	$ (764)	$ (2)

Equity Securities at Fair Val_2

Equity Securities at Fair Value (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 4,830,000		$ 5,418,000
Change in fair value of equity securities	(588,000)	$ (584,000)
Proceeds from sales of equity securities	$ 0	$ 0

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Loan Losses - Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 6,215,828	$ 6,168,892
Net deferred loan costs, fees and purchased premiums and discounts	9,037	12,878
Loans receivable	6,224,865	6,181,770
Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,877,432	1,940,636
Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	2,878,438	2,822,858
Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	338,001	328,711
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	826,546	754,013
Consumer loans | Home equity loans and advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	294,230	321,177
Consumer loans | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,181	1,497
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	6,209,598	6,162,547
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	1,877,131	1,940,327
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	2,873,586	2,817,965
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	338,001	328,711
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	825,469	752,870
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	294,230	321,177
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	1,181	1,497
Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	6,230	6,345
Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	301	309
Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	4,852	4,893
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	1,077	1,143
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, 2021USD ($)loan	Mar. 31, 2020USD ($)loan	Dec. 31, 2020USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale	$ 0		$ 4,100,000
Proceeds from sales of loans held-for-sale	15,822,000	$ 51,621,000
Gain (loss) on sale of loans held-for-sale	0
Proceeds from sales of loans receivable	0	15,555,000
Purchases of loans receivable	0	$ 0
Carrying value of servicing liability	$ 601,600,000		$ 598,000,000
Threshold period, past due status of financial receivables	30 days
Threshold period, past due for nonperforming status of financial receivables	90 days		90 days
Non-accrual	$ 6,200,000		$ 8,200,000
Financing receivable, 90 days or more past due, still accruing	0		0
Financing receivable, before allowance for credit loss	6,224,865,000		6,181,770,000
Real estate owned	0		$ 0
Mortgage loans in process of foreclosure, number of loans | loan			2
Mortgage loans in process of foreclosure, amount			$ 398,000
Specific allowance for loan losses attributable to impaired loans	740,000		1,088,000
Impaired loans for which there are no related allowance for loan losses	18,978,000		19,061,000
Financing receivable, modifications, recorded investment	$ 44,500,000		45,400,000
Number of loans | loan	0	1
Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans receivable		$ 6,700,000
Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale	$ 1,200,000	51,600,000
Gain on sale of loans held-for-sale		672,000
Loss on sale of loans held-for-sale		0
Proceeds from sales of loans receivable		$ 8,800,000
Specific allowance for loan losses attributable to impaired loans	290,000		391,000
Impaired loans for which there are no related allowance for loan losses	2,845,000		3,344,000
Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale	4,100,000
Specific allowance for loan losses attributable to impaired loans	78,000		601,000
Impaired loans for which there are no related allowance for loan losses	$ 14,879,000		13,058,000
Number of loans | loan	0	1
Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale	$ 6,400,000
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale	4,200,000
Gain on sale of loans held-for-sale	435,000
Loss on sale of loans held-for-sale	0
Number of loans receivable | loan		1
Gain on sale of loans receivable		$ 82,000
Loss on sale of loans receivable		0
Specific allowance for loan losses attributable to impaired loans	360,000		84,000
Impaired loans for which there are no related allowance for loan losses	643,000		1,945,000
Less Than 90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	$ 2,200,000		$ 2,200,000
Financial receivable, number of loans in nonaccrual status | loan	18		19
30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, recorded investment	$ 124,000		$ 11,900,000
Number of loans | loan	2		3
90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, recorded investment			$ 91,000
Number of loans | loan			1
Freddie Mac
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans receivable	$ 64,000,000
Gain on sale of loans receivable	1,700,000
Loss on sale of loans receivable	0
Proceeds from securitizations of loans held-for-investment		$ 0
Stewardship Financial Corporation | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss	6,000,000		$ 6,100,000
Roselle Entities | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit loss	244,000		246,000
Paycheck Protection Program | Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, unamortized loan fee	11,300,000		6,600,000
Financing receivable, before allowance for credit loss	$ 446,200,000		$ 344,400,000

Loans Receivable and Allowanc_5

Loans Receivable and Allowance for Loan Losses - Aging of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Non-accrual	$ 6,200	$ 8,200
Total	6,215,828	6,168,892
Real estate loans | One-to-four family
Financing Receivable, Past Due [Line Items]
Total	1,877,432	1,940,636
Real estate loans | Multifamily and commercial
Financing Receivable, Past Due [Line Items]
Total	2,878,438	2,822,858
Real estate loans | Construction
Financing Receivable, Past Due [Line Items]
Total	338,001	328,711
Commercial business loans
Financing Receivable, Past Due [Line Items]
Total	826,546	754,013
Consumer loans | Home equity loans and advances
Financing Receivable, Past Due [Line Items]
Total	294,230	321,177
Consumer loans | Other consumer loans
Financing Receivable, Past Due [Line Items]
Total	1,181	1,497
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Past Due [Line Items]
Total Past Due	12,415	31,416
Non-accrual	6,154	8,156
Current	6,191,029	6,122,975
Total	6,209,598	6,162,547
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	7,929	22,766
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	499	2,664
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 90 Days or More
Financing Receivable, Past Due [Line Items]
Total Past Due	3,987	5,986
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	3,113	5,881
Non-accrual	2,097	2,637
Current	1,871,921	1,931,809
Total	1,877,131	1,940,327
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	1,542	3,068
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	367	912
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	1,204	1,901
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	5,265	16,883
Non-accrual	1,864	1,873
Current	2,866,457	2,799,209
Total	2,873,586	2,817,965
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	4,027	15,645
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	0
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	1,238	1,238
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	550
Non-accrual	0	0
Current	338,001	328,161
Total	338,001	328,711
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	0	550
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	3,128	5,852
Non-accrual	1,790	2,968
Current	820,551	744,050
Total	825,469	752,870
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	1,836	2,343
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	0	1,056
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	1,292	2,453
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	905	2,246
Non-accrual	403	678
Current	292,922	318,253
Total	294,230	321,177
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	520	1,156
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	132	696
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	253	394
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans
Financing Receivable, Past Due [Line Items]
Total Past Due	4	4
Non-accrual	0	0
Current	1,177	1,493
Total	1,181	1,497
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	4	4
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) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 418	$ 511
Accretion	(32)	(49)
Net change in expected cash flows	22	1
Balance at end of period	$ 408	$ 463

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Allowance for loan losses:
Total	$ 71,904	$ 74,676	$ 71,200	$ 61,709
Total loans:
Total	6,215,828	6,168,892
Real estate loans | One-to-four family
Allowance for loan losses:
Total	19,850	13,586	16,798	13,780
Total loans:
Total	1,877,432	1,940,636
Real estate loans | Multifamily and commercial
Allowance for loan losses:
Total	23,849	30,681	26,085	22,980
Total loans:
Total	2,878,438	2,822,858
Real estate loans | Construction
Allowance for loan losses:
Total	11,464	11,271	9,399	7,435
Total loans:
Total	338,001	328,711
Commercial business loans
Allowance for loan losses:
Total	14,804	17,384	17,191	15,836
Total loans:
Total	826,546	754,013
Consumer loans | Home equity loans and advances
Allowance for loan losses:
Total	1,931	1,748	1,718	1,669
Total loans:
Total	294,230	321,177
Consumer loans | Other consumer loans
Allowance for loan losses:
Total	6	6	$ 9	$ 9
Total loans:
Total	1,181	1,497
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	740	1,088
Allowance for loan losses, Collectively evaluated for impairment	71,164	73,588
Total loans:
Total loans, individually evaluated for impairment	43,200	45,147
Total loans, collectively evaluated for impairment	6,166,398	6,117,400
Total	6,209,598	6,162,547
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	290	391
Allowance for loan losses, Collectively evaluated for impairment	19,560	13,195
Total loans:
Total loans, individually evaluated for impairment	6,630	7,257
Total loans, collectively evaluated for impairment	1,870,501	1,933,070
Total	1,877,131	1,940,327
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	78	601
Allowance for loan losses, Collectively evaluated for impairment	23,771	30,080
Total loans:
Total loans, individually evaluated for impairment	32,533	32,792
Total loans, collectively evaluated for impairment	2,841,053	2,785,173
Total	2,873,586	2,817,965
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	11,464	11,271
Total loans:
Total loans, individually evaluated for impairment	0	0
Total loans, collectively evaluated for impairment	338,001	328,711
Total	338,001	328,711
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	360	84
Allowance for loan losses, Collectively evaluated for impairment	14,444	17,300
Total loans:
Total loans, individually evaluated for impairment	2,467	3,447
Total loans, collectively evaluated for impairment	823,002	749,423
Total	825,469	752,870
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	12	12
Allowance for loan losses, Collectively evaluated for impairment	1,919	1,736
Total loans:
Total loans, individually evaluated for impairment	1,570	1,651
Total loans, collectively evaluated for impairment	292,660	319,526
Total	294,230	321,177
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	6	6
Total loans:
Total loans, individually evaluated for impairment	0	0
Total loans, collectively evaluated for impairment	1,181	1,497
Total	1,181	1,497
Financial Asset Acquired with Credit Deterioration
Allowance for loan losses:
Total	0	0
Total loans:
Total	6,230	6,345
Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family
Allowance for loan losses:
Total	0	0
Total loans:
Total	301	309
Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Allowance for loan losses:
Total	0	0
Total loans:
Total	4,852	4,893
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	1,077	1,143
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_8

Loans Receivable and Allowance for Loan Losses - Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
No. of Loans | loan	0	1
Pre-modification Recorded Investment	$ 0	$ 10,212
Post-modification Recorded Investment	$ 0	$ 11,507
Real estate loans | Multifamily and commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
No. of Loans | loan	0	1
Pre-modification Recorded Investment	$ 0	$ 10,212
Post-modification Recorded Investment	$ 0	$ 11,507

Loans Receivable and Allowanc_9

Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Allowance for loan losses:
Balance at beginning of period	$ 74,676	$ 61,709
Provision charged (credited)	(1,280)	9,568
Recoveries	37	98
Charge-offs	(1,529)	(175)
Balance at end of period	71,904	71,200
Real estate loans | One-to-four family
Allowance for loan losses:
Balance at beginning of period	13,586	13,780
Provision charged (credited)	6,477	3,101
Recoveries	3	3
Charge-offs	(216)	(86)
Balance at end of period	19,850	16,798
Real estate loans | Multifamily and commercial
Allowance for loan losses:
Balance at beginning of period	30,681	22,980
Provision charged (credited)	(6,672)	3,096
Recoveries	6	10
Charge-offs	(166)	(1)
Balance at end of period	23,849	26,085
Real estate loans | Construction
Allowance for loan losses:
Balance at beginning of period	11,271	7,435
Provision charged (credited)	192	1,964
Recoveries	1	0
Charge-offs	0	0
Balance at end of period	11,464	9,399
Commercial business loans
Allowance for loan losses:
Balance at beginning of period	17,384	15,836
Provision charged (credited)	(1,509)	1,347
Recoveries	16	71
Charge-offs	(1,087)	(63)
Balance at end of period	14,804	17,191
Consumer loans | Home equity loans and advances
Allowance for loan losses:
Balance at beginning of period	1,748	1,669
Provision charged (credited)	230	59
Recoveries	11	14
Charge-offs	(58)	(24)
Balance at end of period	1,931	1,718
Consumer loans | Other consumer loans
Allowance for loan losses:
Balance at beginning of period	6	9
Provision charged (credited)	2	1
Recoveries	0	0
Charge-offs	(2)	(1)
Balance at end of period	$ 6	$ 9

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	$ 18,978	$ 19,061
With no allowance recorded: Unpaid principal balance	20,465	19,788
With a specific allowance recorded: Recorded investment	24,222	26,086
With a specific allowance recorded: Unpaid principal balance	25,199	26,708
Recorded Investment	43,200	45,147
Unpaid Principal Balance	45,664	46,496
Specific Allowance	740	1,088
Real estate loans | One-to-four family
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	2,845	3,344
With no allowance recorded: Unpaid principal balance	3,385	3,898
With a specific allowance recorded: Recorded investment	3,785	3,913
With a specific allowance recorded: Unpaid principal balance	3,803	3,919
Recorded Investment	6,630	7,257
Unpaid Principal Balance	7,188	7,817
Specific Allowance	290	391
Real estate loans | Multifamily and commercial
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	14,879	13,058
With no allowance recorded: Unpaid principal balance	15,694	13,094
With a specific allowance recorded: Recorded investment	17,654	19,734
With a specific allowance recorded: Unpaid principal balance	17,657	20,350
Recorded Investment	32,533	32,792
Unpaid Principal Balance	33,351	33,444
Specific Allowance	78	601
Commercial business loans
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	643	1,945
With no allowance recorded: Unpaid principal balance	643	1,945
With a specific allowance recorded: Recorded investment	1,824	1,502
With a specific allowance recorded: Unpaid principal balance	2,780	1,502
Recorded Investment	2,467	3,447
Unpaid Principal Balance	3,423	3,447
Specific Allowance	360	84
Consumer loans | Home equity loans and advances
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	611	714
With no allowance recorded: Unpaid principal balance	743	851
With a specific allowance recorded: Recorded investment	959	937
With a specific allowance recorded: Unpaid principal balance	959	937
Recorded Investment	1,570	1,651
Unpaid Principal Balance	1,702	1,788
Specific Allowance	$ 12	$ 12

Loans Receivable and Allowan_11

Loans Receivable and Allowance for Loan Losses - Interest Income on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 44,175	$ 25,412
Interest Income Recognized	550	367
Real estate loans | One-to-four family
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	6,944	8,688
Interest Income Recognized	74	99
Real estate loans | Multifamily and commercial
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	32,663	8,780
Interest Income Recognized	425	166
Commercial business loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	2,957	5,814
Interest Income Recognized	29	72
Consumer loans | Home equity loans and advances
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,611	2,130
Interest Income Recognized	$ 22	$ 30

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	$ 6,215,828	$ 6,168,892
Real estate loans | One-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	1,877,432	1,940,636
Real estate loans | Multifamily and commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	2,878,438	2,822,858
Real estate loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	338,001	328,711
Commercial business loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	826,546	754,013
Consumer loans | Home equity loans and advances
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	294,230	321,177
Consumer loans | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	1,181	1,497
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	6,209,598	6,162,547
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	6,121,942	6,084,247
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	57,712	47,514
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	29,944	30,786
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	1,877,131	1,940,327
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	1,870,683	1,935,032
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	399	404
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	6,049	4,891
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	2,873,586	2,817,965
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	2,803,914	2,758,905
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	51,121	40,392
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	18,551	18,668
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	338,001	328,711
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	338,001	328,711
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	825,469	752,870
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	814,629	740,010
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	6,192	6,718
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	4,648	6,142
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	294,230	321,177
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	293,534	320,092
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	696	1,085
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	1,181	1,497
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	1,181	1,497
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, 2021	Mar. 31, 2020	Dec. 31, 2020	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Total lease liability	$ 19,904
Operating lease, weighted average remaining lease term	7 years 3 months 18 days		7 years 6 months
Operating lease, weighted average discount rate	2.22%		2.26%
Lease, cost	$ 681	$ 694
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term	3 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
Total lease liability				$ 23,300

Leases - Operating Lease Paymen

Leases - Operating Lease Payment Obligations (Details) $ in Thousands	Mar. 31, 2021USD ($)
Leases [Abstract]
2021	$ 3,081
2022	3,827
2023	3,437
2024	2,712
2025	2,041
Thereafter	6,709
Total undiscounted cash flows	21,807
Discount on cash flows	(1,903)
Total lease liability	$ 19,904

Deposits - Schedule of Deposits

Deposits - Schedule of Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deposits [Abstract]
Non-interest-bearing demand	$ 1,489,511	$ 1,354,605
Interest-bearing demand	2,276,501	2,189,164
Money market accounts	621,064	588,180
Savings and club deposits	732,598	688,309
Certificates of deposit	1,876,656	1,958,366
Total deposits	$ 6,996,330	$ 6,778,624

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Interest-bearing demand	$ 2,276,501		$ 2,189,164
Aggregate amount of certificates of deposit exceeding threshold amount	974,700		1,000,000
Interest expense on deposits	8,875	$ 16,832
Stewardship Financial Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Interest-bearing demand	$ 16,300		$ 26,300

Deposits - Schedule of Deposit

Deposits - Schedule of Deposit Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deposits [Abstract]
One year or less	$ 1,457,641	$ 1,494,129
After one year to two years	286,269	337,579
After two years to three years	56,623	52,809
After three years to four years	27,548	23,018
After four years	48,575	50,831
Total term certificate accounts	$ 1,876,656	$ 1,958,366

Stock Based Compensation - Narr

Stock Based Compensation - Narrative (Details) - USD ($)	Mar. 22, 2021	Mar. 21, 2021	Dec. 14, 2020	Dec. 16, 2019	Jul. 23, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	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
Granted (in shares)	109,654			184,378	3,707,901	109,654
Grants in period (in dollars per share)	$ 4.91			$ 4.59	$ 4.25
Granted (in dollars per share)	$ 17.86			$ 17	$ 15.60	$ 17.86
Exercises in period (in shares)						0	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)		50,203	33,160	74,673	1,389,570	50,203
Granted (in dollars per share)		$ 17.86	$ 15.08	$ 17	$ 15.60	$ 17.86
Stock based compensation						$ 1,400,000	$ 1,400,000
Non-vested restricted shares outstanding (in shares)						1,299,526	1,419,131	1,263,169	1,420,012
Non-vested restricted shares outstanding, amount						$ 13,800,000
Period for recognition (in years)						2 years 8 months 12 days
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					1 year
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)	3 years			5 years	5 years
Stock based compensation						$ 761,000	$ 798,500
Non-vested restricted shares outstanding (in shares)						3,044,866
Non-vested restricted shares outstanding, amount						$ 10,900,000
Period for recognition (in years)						3 years 4 months 24 days
Expiration period (in years)	10 years			10 years	10 years
Expected term	6 years			6 years 6 months	6 years 6 months
Risk free interest rate	1.11%			1.79%	1.90%
Expected volatility rate	25.98%			22.23%	22.12%
Expected dividend rate	0.00%			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			1 year	1 year

Stock Based Compensation - Rest

Stock Based Compensation - Restricted Stock Activity (Details) - Restricted Stock - $ / shares	Mar. 21, 2021	Dec. 14, 2020	Dec. 16, 2019	Jul. 23, 2019	Mar. 31, 2021	Mar. 31, 2020
Number of Restricted Shares
Beginning balance (in shares)					1,263,169	1,420,012
Granted (in shares)	50,203	33,160	74,673	1,389,570	50,203
Forfeited (in shares)					(13,846)	(881)
Ending balance (in shares)					1,299,526	1,419,131
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)					$ 15.66	$ 15.67
Granted (in dollars per share)	$ 17.86	$ 15.08	$ 17	$ 15.60	17.86
Forfeited (in dollars per share)					15.60	15.60
Ending balance (in dollars per share)					$ 15.74	$ 15.67

Stock Based Compensation - Stoc

Stock Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 22, 2021	Dec. 16, 2019	Jul. 23, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Number of Stock Options
Beginning balance (in shares)				3,708,628	3,784,044	3,784,044
Granted (in shares)	109,654	184,378	3,707,901	109,654
Expired (in shares)				(2,029)
Forfeited (in shares)				(30,118)	(9,707)
Ending balance (in shares)				3,786,135	3,774,337	3,708,628	3,784,044
Options exercisable (in shares)				741,269	0
Weighted Average Exercise Price
Beginning balance (in dollars per share)				$ 15.66	$ 15.67	$ 15.67
Granted (in dollars per share)	$ 17.86	$ 17	$ 15.60	17.86
Expired (in dollars per share)				15.60
Forfeited (in dollars per share)				15.60	15.60
Ending balance (in dollars per share)				15.73	15.67	$ 15.66	$ 15.67
Options exercisable (in dollars per share)				$ 15.66	$ 0
Weighted Average Remaining Contractual Term (in years)
Options outstanding				8 years 4 months 24 days	9 years 3 months 18 days	8 years 7 months 6 days	9 years 7 months 6 days
Options exercisable				8 years 2 months 12 days
Aggregate Intrinsic Value
Options outstanding				$ 6,673,328	$ 0	$ 0	$ 4,812,490
Options exercisable				$ 1,345,897

Components of Net Periodic Be_3

Components of Net Periodic Benefit Costs (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
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	2,150,000	$ 1,937,000
Interest cost	1,756,000	2,031,000
Expected return on plan assets	(6,318,000)	(5,737,000)
Amortization of Prior service cost	0	0
Amortization of Net loss	1,000,000	781,000
Net periodic (income) benefit cost	(1,412,000)	(988,000)
RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	100,000	67,000
Interest cost	86,000	102,000
Expected return on plan assets	0	0
Amortization of Prior service cost	0	0
Amortization of Net loss	166,000	99,000
Net periodic (income) benefit cost	352,000	268,000
Post-retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	130,000	99,000
Interest cost	141,000	171,000
Expected return on plan assets	0	0
Amortization of Prior service cost	0	0
Amortization of Net loss	153,000	77,000
Net periodic (income) benefit cost	424,000	347,000
Split-Dollar Life Insurance
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	141,000	106,000
Interest cost	125,000	114,000
Expected return on plan assets	0	0
Amortization of Prior service cost	14,000	14,000
Amortization of Net loss	191,000	113,000
Net periodic (income) benefit cost	471,000	$ 347,000
Former Bank President | RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic (income) benefit cost	$ 2,000

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	$ 1,474,246	$ 1,316,952
Equity securities	4,830	5,418
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	39,795	25,549
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	1,348,541	1,200,394
Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	16,649	16,862
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	64,565	69,477
Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	4,696	4,670
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	39,795	25,549
Equity securities	4,484	5,072
Derivative assets	0	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	1,434,451	1,291,403
Equity securities	346	346
Derivative assets	10,136	19,425
Derivative liabilities	26,843	42,384
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	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	1,474,246	1,316,952
Equity securities	4,830	5,418
Derivative assets	10,136	19,425
Assets	1,489,212	1,341,795
Derivative liabilities	26,843	42,384
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	39,795	25,549
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	1,348,541	1,200,394
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	16,649	16,862
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	64,565	69,477
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	4,696	4,670
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	39,795	25,549
Equity securities	4,484	5,072
Derivative assets	0	0
Assets	44,279	30,621
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	39,795	25,549
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	1,434,451	1,291,403
Equity securities	346	346
Derivative assets	10,136	19,425
Assets	1,444,933	1,311,174
Derivative liabilities	26,843	42,384
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	1,348,541	1,200,394
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	16,649	16,862
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	64,565	69,477
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	4,696	4,670
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, 2021
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, 2021	Dec. 31, 2020
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	6,372,104	6,394,524
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	1,580
Mortgage servicing rights	1,985	1,338
Assets	3,565	1,338
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	1,580
Mortgage servicing rights	1,985	1,338
Assets	$ 3,565	$ 1,338

Fair Value Measurements - Quali

Fair Value Measurements - Qualitative Valuation (Details) $ in Thousands	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Measured on non-recurring basis
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	$ 1,580
Mortgage servicing rights	1,985	$ 1,338
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	6,372,104	6,394,524
Significant Unobservable Inputs (Level 3) | Measured on non-recurring basis
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	1,580
Mortgage servicing rights	$ 1,985	$ 1,338
Significant Unobservable Inputs (Level 3) | Discount Rate | Measured on non-recurring basis | Discounted 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 | Discounted 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
Significant Unobservable Inputs (Level 3) | Prepayment Speeds and Discounts Rates | Measured on non-recurring basis | Minimum | Discounted cash flow
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing asset, measurement input	0.086	0.097
Significant Unobservable Inputs (Level 3) | Prepayment Speeds and Discounts Rates | Measured on non-recurring basis | Maximum | Discounted cash flow
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing asset, measurement input	0.248	0.262
Significant Unobservable Inputs (Level 3) | Prepayment Speeds and Discounts Rates | Measured on non-recurring basis | Weighted Average | Discounted cash flow
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing asset, measurement input	0.131	0.167

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value on Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial assets:
Debt securities available for sale, at fair value	$ 1,474,246	$ 1,316,952
Debt securities held to maturity	398,906	277,091
Equity securities	4,830	5,418
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	359,716	422,957
Debt securities available for sale, at fair value	39,795	25,549
Debt securities held to maturity	34,502	5,001
Equity securities	4,484	5,072
Federal Home Loan Bank stock	0	0
Loans receivable, net	0	0
Derivative assets	0	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	1,434,451	1,291,403
Debt securities held to maturity	364,404	272,090
Equity securities	346	346
Federal Home Loan Bank stock	40,280	43,759
Loans receivable, net	0	0
Derivative assets	10,136	19,425
Financial liabilities:
Deposits	7,004,371	6,793,034
Borrowings	729,280	808,853
Derivative liabilities	26,843	42,384
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	6,372,104	6,394,524
Derivative assets	0	0
Financial liabilities:
Deposits	0	0
Borrowings	0	0
Derivative liabilities	0	0
Carrying Value
Financial assets:
Cash and cash equivalents	359,716	422,957
Debt securities available for sale, at fair value	1,474,246	1,316,952
Debt securities held to maturity	391,264	262,720
Equity securities	4,830	5,418
Federal Home Loan Bank stock	40,280	43,759
Loans receivable, net	6,152,961	6,107,094
Derivative assets	10,136	19,425
Financial liabilities:
Deposits	6,996,330	6,778,624
Borrowings	722,615	799,364
Derivative liabilities	26,843	42,384
Total Fair Value
Financial assets:
Cash and cash equivalents	359,716	422,957
Debt securities available for sale, at fair value	1,474,246	1,316,952
Debt securities held to maturity	398,906	277,091
Equity securities	4,830	5,418
Federal Home Loan Bank stock	40,280	43,759
Loans receivable, net	6,372,104	6,394,524
Derivative assets	10,136	19,425
Financial liabilities:
Deposits	7,004,371	6,793,034
Borrowings	729,280	808,853
Derivative liabilities	$ 26,843	$ 42,384

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, 2021	Mar. 31, 2020
Before Tax
Other comprehensive income (loss)	$ (12,487)	$ 11,486
Tax Effect
Other comprehensive income (loss)	9,605	(2,416)
After Tax
Total other comprehensive (loss) income	(2,882)	9,070
Unrealized Gains on Debt Securities Available for Sale
Before Tax
Other comprehensive income (loss), before reclassifications	(19,840)	24,383
Other comprehensive income (loss)	(19,844)	24,761
Tax Effect
Other comprehensive income (loss), before reclassifications	2,806	(5,116)
Other comprehensive income (loss)	2,824	(5,199)
After Tax
Other comprehensive income (loss), before reclassifications	(17,034)	19,267
Total other comprehensive (loss) income	(17,020)	19,562
AOCI, Accumulated Gain (Loss), Debt Securities Available-for-sale, Accretion Of Unrealized Gains (Losses), Parent
Before Tax
Reclassification from AOCI, current period	(4)	8
Tax Effect
Reclassification from AOCI, current period	18	(2)
After Tax
Reclassification from AOCI, current period	14	6
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Other Reclassifications, Parent
Before Tax
Reclassification from AOCI, current period	0	370
Tax Effect
Reclassification from AOCI, current period	0	(81)
After Tax
Reclassification from AOCI, current period	0	289
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Before Tax
Other comprehensive income (loss), before reclassifications	5,832	(14,360)
Tax Effect
Other comprehensive income (loss), before reclassifications	(149)	3,011
After Tax
Other comprehensive income (loss), before reclassifications	5,683	(11,349)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Before Tax
Reclassification from AOCI, current period	(14)	42
Tax Effect
Reclassification from AOCI, current period	4	(9)
After Tax
Reclassification from AOCI, current period	(10)	33
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Before Tax
Reclassification from AOCI, current period	(1,511)	2,638
Tax Effect
Reclassification from AOCI, current period	422	(554)
After Tax
Reclassification from AOCI, current period	(1,089)	2,084
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Before Tax
Other comprehensive income (loss), before reclassifications	3,050	(1,595)
Other comprehensive income (loss)	1,525	1,085
Tax Effect
Other comprehensive income (loss), before reclassifications	6,504	335
Other comprehensive income (loss)	6,930	(228)
After Tax
Other comprehensive income (loss), before reclassifications	9,554	(1,260)
Total other comprehensive (loss) income	$ 8,455	$ 857

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, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,011,287	$ 982,517
Current period changes in other comprehensive income (loss)	(2,882)	9,070
Balance at end of year	999,649	961,126
Accumulated Other Comprehensive (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(69,625)	(68,735)
Current period changes in other comprehensive income (loss)	(2,882)	9,070
Balance at end of year	(72,507)	(59,665)
Unrealized Gains on Debt Securities Available for Sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	31,028	9,377
Current period changes in other comprehensive income (loss)	(17,020)	19,562
Balance at end of year	14,008	28,939
Unrealized (Losses) on Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(16,856)	(8,474)
Current period changes in other comprehensive income (loss)	5,683	(11,349)
Balance at end of year	(11,173)	(19,823)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(83,797)	(69,638)
Current period changes in other comprehensive income (loss)	8,455	857
Balance at end of year	$ (75,342)	$ (68,781)

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain on securities transactions	$ 0	$ 370
Other non-interest expense	2,640	3,323
Income before income tax expense	28,912	9,017
Income (tax) benefit	(7,867)	(2,252)
Net income	21,045	6,765
Accumulated Other Comprehensive Income (Loss) Components
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income before income tax expense	(1,511)	3,008
Income (tax) benefit	422	(635)
Net income	(1,089)	2,373
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	0	370
Accumulated Other Comprehensive Income (Loss) Components | Reclassification adjustment of actuarial net (loss) gain included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-interest expense	$ (1,511)	$ 2,638

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Narrative (Details)	3 Months Ended
	Mar. 31, 2021USD ($)swap	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)swap
Derivative [Line Items]
Accrued interest on derivatives, at fair value	$ 971,000		$ 1,000,000
Derivative, net liability position, aggregate fair value	15,700,000
Derivative, collateral, right to reclaim cash	27,000,000
Interest Rate Swap
Derivative [Line Items]
Derivative gain (loss) on derivative, net	(368,000)	$ 426,000
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	$ 175,100,000		$ 175,100,000
Number of commercial banking customers | swap	48		48
Federal Home Loan Bank Advances | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative	$ 410,000,000		$ 430,000,000
Number of interest rate derivatives held | swap	29		31

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Interest rate swaps | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 10,136	$ 19,425
Interest rate swaps | Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	26,843	42,384
Reported Value Measurement
Derivatives, Fair Value [Line Items]
Derivative assets	10,136	19,425
Derivative liabilities	$ 26,843	$ 42,384

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total out-of-scope non-interest income	$ 4,393	$ 2,444
Total non-interest income	8,595	6,391
Deposit Account, Title Insurance and Other Non-Interest Income
Disaggregation of Revenue [Line Items]
Revenue	4,202	3,947
Demand deposit account fees
Disaggregation of Revenue [Line Items]
Revenue	838	1,299
Title insurance fees
Disaggregation of Revenue [Line Items]
Revenue	1,620	1,231
Other non-interest income
Disaggregation of Revenue [Line Items]
Revenue	$ 1,744	$ 1,417