Columbia Financial (CLBK) 10-Q 9 Nov 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Nov. 04, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 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)		106,281,020
Entity Central Index Key	0001723596
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period	Q3
Amendment Flag	false

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 298,359	$ 422,787
Short-term investments	129	170
Total cash and cash equivalents	298,488	422,957
Debt securities available for sale, at fair value	1,764,866	1,316,952
Debt securities held to maturity, at amortized cost (fair value of $417,268 and $277,091 at September 30, 2021 and December 31, 2020, respectively)	408,088	262,720
Equity securities, at fair value	2,785	5,418
Federal Home Loan Bank stock	40,891	43,759
Loans held-for-sale, at fair value	0	4,146
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	6,084,294	6,181,770
Less: allowance for loan losses	70,326	74,676
Loans receivable	6,013,968	6,107,094
Accrued interest receivable	27,857	29,456
Office properties and equipment, net	74,426	75,974
Bank-owned life insurance ("BOLI")	237,294	232,824
Goodwill and intangible assets	85,864	87,384
Other assets	245,593	209,852
Total assets	9,200,120	8,798,536
Liabilities:
Deposits	7,222,358	6,778,624
Borrowings	749,631	799,364
Advance payments by borrowers for taxes and insurance	36,039	32,570
Accrued expenses and other liabilities	161,216	176,691
Total liabilities	8,169,244	7,787,249
Stockholders' equity:
Preferred stock, $0.01 par value. 10,000,000 shares authorized; none issued and outstanding at September 30, 2021 and December 31, 2020	0	0
Common stock, $0.01 par value. 500,000,000 shares authorized; 122,039,731 shares issued and 106,297,899 shares outstanding at September 30, 2021 and 122,037,793 shares issued and 110,939,753 shares outstanding at December 31, 2020	1,220	1,220
Additional paid-in capital	617,548	609,531
Retained earnings	741,799	673,084
Accumulated other comprehensive loss	(48,855)	(69,625)
Treasury stock, at cost; 15,741,832 shares at September 30, 2021 and 11,098,040 shares at December 31, 2020	(242,447)	(163,015)
Common stock held by the Employee Stock Ownership Plan	(37,597)	(39,293)
Stock held by Rabbi Trust	(2,299)	(1,875)
Deferred compensation obligations	1,507	1,260
Total stockholders' equity	1,030,876	1,011,287
Total liabilities and stockholders' equity	$ 9,200,120	$ 8,798,536
Common stock, shares issued (in shares)	122,039,731	122,037,793

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Debt securities held to maturity	$ 417,268	$ 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)	122,039,731	122,037,793
Common stock, shares outstanding (in shares)	106,297,899	110,939,753
Treasury stock, shares (in shares)	15,741,832	11,098,040

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income:
Loans receivable	$ 55,451	$ 63,258	$ 171,902	$ 192,511
Debt securities available for sale and equity securities	7,622	7,034	21,521	21,654
Debt securities held to maturity	2,353	1,749	6,256	5,807
Federal funds and interest earning deposits	167	71	310	287
Federal Home Loan Bank stock dividends	460	821	1,582	2,951
Total interest income	66,053	72,933	201,571	223,210
Interest expense:
Deposits	6,673	12,826	23,403	44,569
Borrowings	2,028	3,783	5,996	15,744
Total interest expense	8,701	16,609	29,399	60,313
Net interest income	57,352	56,324	172,172	162,897
Provision for (reversal of) loan losses	480	2,516	(2,561)	17,820
Net interest income after provision for (reversal of) loan losses	56,872	53,808	174,733	145,077
Non-interest income:
Bank-owned life insurance	1,504	1,531	4,475	4,467
Loan fees and service charges	844	565	2,209	1,826
Gain on securities transactions	2,296	0	2,015	370
Change in fair value of equity securities	(443)	(4)	(1,809)	55
Gain on sale of loans	140	1,873	10,814	3,422
Other non-interest income	2,116	1,939	6,920	5,017
Total non-interest income	8,874	7,909	31,860	21,308
Non-interest expense:
Compensation and employee benefits	24,512	26,666	71,506	76,349
Occupancy	4,846	4,823	14,912	14,319
Federal deposit insurance premiums	604	614	1,751	1,350
Advertising	662	484	1,860	2,075
Professional fees	1,766	1,680	5,207	4,129
Data processing and software expenses	2,798	2,825	8,181	7,419
Merger-related expenses	55	424	130	1,931
Loss on extinguishment of debt	0	0	742	0
Other non-interest expense	1,809	3,862	8,076	9,757
Total non-interest expense	37,052	41,378	112,365	117,329
Income before income tax expense	28,694	20,339	94,228	49,056
Income tax expense	7,712	5,252	25,513	12,107
Net income	$ 20,982	$ 15,087	$ 68,715	$ 36,949
Earnings per share - basic (in dollars per share)	$ 0.20	$ 0.14	$ 0.66	$ 0.34
Earnings per share - diluted (in dollars per share)	$ 0.20	$ 0.14	$ 0.66	$ 0.34
Weighted average shares outstanding - basic (in shares)	102,977,254	110,983,871	104,486,520	110,177,736
Weighted average shares outstanding - diluted (in shares)	102,977,254	110,983,871	104,486,520	110,177,736
Demand deposit account fees
Non-interest income:
Revenue from contract with customer	$ 986	$ 787	$ 2,682	$ 2,706
Title insurance fees
Non-interest income:
Revenue from contract with customer	$ 1,431	$ 1,218	$ 4,554	$ 3,445

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 20,982	$ 15,087	$ 68,715	$ 36,949
Other comprehensive gain (loss) income, net of tax:
Unrealized (loss) on debt securities available for sale	(9,943)	(2,913)	(22,189)	22,705
Accretion of unrealized (loss) on debt securities reclassified as held to maturity	(2)	(4)	0	1
Reclassification adjustment for gain included in net income	1,791	0	1,589	289
Total other comprehensive (loss) income, net of tax	(8,154)	(2,917)	(20,600)	22,995
Derivatives, net of tax:
Unrealized gain (loss) on swap contracts accounted for as cash flow hedges	1,467	1,785	8,098	(10,314)
Total derivative, net of tax	1,467	1,785	8,098	(10,314)
Employee benefit plans, net of tax:
Amortization of prior service cost included in net income	(10)	(11)	(31)	(32)
Reclassification adjustment of actuarial net (loss) included in net income	(1,089)	(846)	(3,267)	(2,539)
Change in funded status of retirement obligations	2,198	(32,733)	36,570	(29,304)
Total employee benefit plans, net of tax	1,099	(33,590)	33,272	(31,875)
Total other comprehensive (loss) income	(5,588)	(34,722)	20,770	(19,194)
Total comprehensive income (loss), net of tax	$ 15,394	$ (19,635)	$ 89,485	$ 17,755

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholder's Equity - 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	36,949			36,949
Other comprehensive income (loss)	(19,194)				(19,194)
Issuance of common stock to Columbia Bank MHC	68,530	47	68,483
Stock based compensation	6,585		6,585
Purchase of treasury stock	(60,286)					(60,286)
Restricted stock forfeitures	(16)		173			(189)
Repurchase shares for taxes	0		155			(155)
Employee Stock Ownership Plan shares committed to be released	2,374		672				1,702
Funding of deferred compensation obligations	(129)							(294)	165
Balance at end of year at Sep. 30, 2020	$ 1,017,330	1,220	607,735	652,430	(87,929)	(115,580)	(39,862)	(1,814)	1,130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchased shares for taxes (in shares)	11,782
Balance at beginning of period at Jun. 30, 2020	$ 1,040,988	1,220	605,124	637,343	(53,207)	(108,327)	(40,434)	(1,767)	1,036
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,087			15,087
Other comprehensive income (loss)	(34,722)				(34,722)
Stock based compensation	2,176		2,176
Purchase of treasury stock	(6,925)					(6,925)
Restricted stock forfeitures	0		173			(173)
Repurchase shares for taxes	0		155			(155)
Employee Stock Ownership Plan shares committed to be released	679		107				572
Funding of deferred compensation obligations	47							(47)	94
Balance at end of year at Sep. 30, 2020	$ 1,017,330	1,220	607,735	652,430	(87,929)	(115,580)	(39,862)	(1,814)	1,130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchased shares for taxes (in shares)	11,782
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	68,715			68,715
Other comprehensive income (loss)	20,770				20,770
Treasury stock allocated to restricted stock award grants	0		(733)			733
Stock based compensation	6,743		6,743
Purchase of treasury stock	(79,090)					(79,090)
Exercise of stock options	(25)		(25)
Restricted stock forfeitures	0		783			(783)
Repurchase shares for taxes	(292)					(292)
Employee Stock Ownership Plan shares committed to be released	2,945		1,249				1,696
Funding of deferred compensation obligations	(177)							(424)	247
Balance at end of year at Sep. 30, 2021	$ 1,030,876	1,220	617,548	741,799	(48,855)	(242,447)	(37,597)	(2,299)	1,507
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchased shares for taxes (in shares)	16,599
Balance at beginning of period at Jun. 30, 2021	$ 1,033,046	1,220	614,381	720,817	(43,267)	(221,072)	(38,169)	(2,205)	1,341
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,982			20,982
Other comprehensive income (loss)	(5,588)				(5,588)
Stock based compensation	2,203		2,203
Purchase of treasury stock	(20,544)					(20,544)
Exercise of stock options	(26)		(26)
Restricted stock forfeitures	0		539			(539)
Repurchase shares for taxes	(292)					(292)
Employee Stock Ownership Plan shares committed to be released	1,023		451				572
Funding of deferred compensation obligations	72							(94)	166
Balance at end of year at Sep. 30, 2021	$ 1,030,876	$ 1,220	$ 617,548	$ 741,799	$ (48,855)	$ (242,447)	$ (37,597)	$ (2,299)	$ 1,507
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchased shares for taxes (in shares)	16,599

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholder's Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Treasury stock, shares purchased (in shares)	1,163,500	624,932	4,633,540	4,081,132
Restricted stock, shares forfeited (in shares)	29,882	15,390	43,856	16,511
Repurchased shares for taxes (in shares)	16,599	11,782	16,599	11,782
Repurchase shares for taxes	$ (292)	$ 0	$ (292)	$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 68,715,000	$ 36,949,000
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	16,000	818,000
Net amortization of premiums and discounts on securities	3,497,000	1,573,000
Net amortization of mortgage servicing rights	200,000	85,000
Amortization of intangible assets	774,000	783,000
Depreciation and amortization of office properties and equipment	5,019,000	4,947,000
Amortization of operating lease right-of-use assets	2,720,000	2,641,000
Loss on extinguishment of debt	742,000	0
Provision for (reversal of) loan losses	(2,561,000)	17,820,000
Gain on securities transactions	(2,015,000)	(370,000)
Change in fair value of equity securities	1,809,000	(55,000)
Gain on securitizations	(2,259,000)	(1,523,000)
Gain on sale of loans	(8,555,000)	(1,899,000)
Loss on disposal of office properties and equipment	61,000	691,000
Loss on write-down of mortgage servicing rights	0	75,000
Deferred tax expense (benefit)	10,515,000	(3,864,000)
Decrease (increase) in accrued interest receivable	1,599,000	(8,481,000)
(Increase) in other assets	(12,891,000)	(80,110,000)
(Increase) decrease in accrued expenses and other liabilities	(4,941,000)	33,687,000
Income on bank-owned life insurance	(4,475,000)	(4,467,000)
Employee stock ownership plan expense	2,945,000	2,374,000
Stock based compensation	6,743,000	6,585,000
Increase in deferred compensation obligations under Rabbi Trust	(177,000)	(129,000)
Net cash provided by operating activities	67,481,000	8,130,000
Cash flows from investing activities:
Proceeds from sales of debt securities available for sale	27,249,000	20,761,000
Proceeds from sales of equity securities	1,260,000	0
Proceeds from paydowns/maturities/calls of debt securities available for sale	257,347,000	162,161,000
Proceeds from paydowns/maturities/calls of debt securities held to maturity	29,616,000	30,988,000
Purchases of debt securities available for sale	(659,015,000)	(201,504,000)
Purchases of debt securities held to maturity	(175,491,000)	(5,000,000)
Purchases of equity securities	(91,000)	0
Proceeds from sales of loans held-for-sale	293,005,000	111,764,000
Proceeds from sales of loans receivable	0	28,923,000
Purchases of loans receivable	(74,232,000)	0
Net increase in loans receivable	(208,260,000)	(294,040,000)
Proceeds from bank-owned life insurance death benefits	5,000	0
Proceeds from redemptions of Federal Home Loan Bank stock	7,661,000	40,717,000
Purchases of Federal Home Loan Bank stock	(4,793,000)	(22,544,000)
Proceeds from sales of office properties and equipment	685,000	0
Additions to office properties and equipment	(4,217,000)	(3,750,000)
Net cash acquired in acquisition	0	155,248,000
Net cash (used in) provided by investing activities	(509,271,000)	23,724,000
Cash flows from financing activities:
Net increase in deposits	443,734,000	650,572,000
Proceeds from long-term borrowings	37,120,000	90,000,000
Payments on long-term borrowings	(54,168,000)	(181,345,000)
Net decrease in short-term borrowings	(33,427,000)	(321,595,000)
Payment of subordinated debt	0	(16,600,000)
Increase in advance payments by borrowers for taxes and insurance	3,469,000	(2,235,000)
Exercise of stock options	(25,000)	0
Purchase of treasury stock	(79,090,000)	(60,286,000)
Repurchase of shares for taxes	(292,000)	0
Restricted stock forfeitures	0	(16,000)
Net cash provided by financing activities	317,321,000	158,495,000
Net (decrease) increase in cash and cash equivalents	(124,469,000)	190,349,000
Cash and cash equivalents at beginning of year	422,957,000	75,547,000
Cash and cash equivalents at end of period	298,488,000	265,896,000
Cash paid during the period for:
Interest on deposits and borrowings	29,544,000	60,772,000
Income tax payments, net of refunds	13,203,000	12,249,000
Non-cash investing and financing activities:
Transfer of loans receivable to loans held-for-sale	280,304,000	114,171,000
Securitization of loans	99,603,000	48,526,000
Initial recognition of operating lease right-of-use assets	0	22,218,000
Initial recognition of operating lease liabilities	0	23,290,000
Non-cash assets acquired:
Debt securities available for sale	0	51,479,000
Debt securities held to maturity	0	13,418,000
Equity securities	0	1,796,000
Federal Home Loan Bank stock	0	2,010,000
Loans receivable	0	171,593,000
Accrued interest receivable	0	679,000
Office properties and equipment, net	0	5,774,000
Bank-owned life insurance	0	17,245,000
Other assets	0	2,823,000
Total non-cash assets acquired	0	266,817,000
Liabilities assumed:
Deposits	0	333,234,000
Borrowings	0	37,728,000
Advance payments by borrowers for taxes and insurance	0	982,000
Accrued expenses and other liabilities	0	5,400,000
Total liabilities assumed	0	377,344,000
Net non-cash liabilities assumed	0	(110,527,000)
Noncash Investing and Financing Activities Disclosure
Net cash and cash equivalents acquired in acquisition	$ 0	$ 155,248,000

Basis of Financial Statement Pr

Basis of Financial Statement Presentation	9 Months Ended
	Sep. 30, 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 and nine month periods ended September 30, 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. 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	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [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 aggregate merger 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 nine months ended September 30, 2020, four of these branches were closed, and the Bank recorded a loss of $770,000 related to these branch closures. During the nine months ended September 30, 2021, the Bank recorded additional losses of $301,000 related to these branches. A credit of $14,000 related to one of these branches was recorded for the three months ended September 30, 2021. 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 $248,000 and $1.3 million during the three and nine months ended September 30, 2020, respectively. There were no merger expenses recorded for the three and nine months ended September 30, 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 $175,000 and $618,000 during the three and nine months ended September 30, 2020. There were no merger expenses recorded for the three and nine months ended September 30, 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 (continued) 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. 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 September 30, 2021, goodwill related to the Roselle acquisition totaled $17.6 million. Freehold Bank As previously disclosed, on June 17, 2021, the MHC, Columbia Financial, Inc. and the Bank (collectively, “Columbia”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Freehold MHC, Freehold Bancorp and Freehold Bank (collectively, “Freehold”), pursuant to which Columbia will acquire Freehold, with Freehold MHC and Freehold Bancorp merging into the MHC and Columbia Financial, respectively. At the effective time of these mergers, Freehold Bank will convert to a federal savings bank and operate as a wholly-owned subsidiary of Columbia Financial. As a subsidiary of Columbia Financial, current depositors of Freehold Bank will become members of, and will have the same rights and privileges in the MHC, the mutual holding company parent of Columbia Bank, as if their accounts had been established in Columbia Bank on the date established at Freehold. As part of the transaction, Columbia Financial will issue additional shares of its common stock to the MHC in an amount equal to the fair value of Freehold as determined by an independent appraiser. These shares are expected to be issued immediately prior to completion of the mergers. The Merger Agreement has been unanimously approved by the Boards of Directors of each of Columbia Financial, the MHC and the Bank and the Boards of Directors of each of Freehold MHC, Freehold Bancorp and Freehold Bank. Subject to the receipt of all required regulatory and other approvals, and the satisfaction or waiver of other customary closing conditions, the parties anticipate that the transactions contemplated by the Merger Agreement is anticipated to close in the fourth quarter of 2021. 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 pending Freehold acquisition totaled $55,000 and $130,000 during the three and nine months ended September 30, 2021. There were no merger expenses recorded for the three and nine months ended September 30, 2020.

Earnings per Share

Earnings per Share	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2021 and 2020: 3. Earnings per Share (continued) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands, except per share data) Net income $ 20,982 $ 15,087 $ 68,715 $ 36,949 Shares: Weighted average shares outstanding - basic 102,977,254 110,983,871 104,486,520 110,177,736 Weighted average dilutive shares outstanding — — — — Weighted average shares outstanding - diluted 102,977,254 110,983,871 104,486,520 110,177,736 Earnings per share: Basic $ 0.20 $ 0.14 $ 0.66 $ 0.34 Diluted $ 0.20 $ 0.14 $ 0.66 $ 0.34 During the three and nine months ended September 30, 2021, the average number of stock options which could potentially dilute basic earnings per share in the future that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive totaled 3,731,901 and 3,741,138, respectively. During the three and nine months ended September 30, 2020, the average number of stock options which could potentially dilute basic earnings per share in the future that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive totaled 3,771,082 and 3,769,793, respectively.

Stock Repurchase Program

Stock Repurchase Program	9 Months Ended
	Sep. 30, 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 5, 2021, the Company completed the repurchases under the second stock repurchase program. 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	9 Months Ended
	Sep. 30, 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 5. Summary of Significant Accounting Policies Accounting Pronouncement Adopted in 2021 (continued) 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 this 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: • 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 September 30, 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 5. Summary of Significant Accounting Policies Accounting Pronouncements Not Yet Adopted (continued) 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	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Debt Securities Available for Sale	Debt Securities Available for Sale D ebt securities available for sale at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 38,651 $ 749 $ (97) $ 39,303 Mortgage-backed securities and collateralized mortgage obligations 1,638,630 21,077 (9,095) 1,650,612 Municipal obligations 10,190 20 — 10,210 Corporate debt securities 62,743 2,227 (229) 64,741 $ 1,750,214 $ 24,073 $ (9,421) $ 1,764,866 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 September 30, 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. 6. Debt Securities Available for Sale (continued) September 30, 2021 Amortized Cost Fair Value (In thousands) One year or less $ 6,944 $ 6,944 More than one year to five years 68,415 70,837 More than five years to ten years 36,225 36,473 $ 111,584 $ 114,254 Mortgage-backed securities and collateralized mortgage obligations 1,638,630 1,650,612 $ 1,750,214 $ 1,764,866 Mortgage-backed securities and collateralized mortgage obligations totaling $1.6 billion at amortized cost, and $1.7 billion at fair value, are not classified by maturity in the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. During the three months ended September 30, 2021, the sales of debt securities available for sale totaled $22.5 million, resulting in a gross gains of $2.0 million and no gross losses. Proceeds from called debt securities available for sale totaled $9.0 million, resulting in no gross gains or losses. No debt securities available for sale matured during the quarter. During the nine months ended September 30, 2021, the sale of debt securities available for sale totaled $27.2 million, resulting in a gross gains of $2.0 million and gross losses of $281,000. Proceeds from called debt securities available for sale totaled $14.0 million, resulting in no gross gains or losses. Proceeds from matured debt securities available for sale totaled $210,000. During the three months ended September 30, 2020, there were no sales, calls or matured debt securities available for sale. During the nine months ended September 30, 2020, the sale of debt securities available for sale totaled $20.8 million, resulting in gross gains of $369,000. Proceeds from called debt securities available for sale totaled $6.6 million, resulting in $1,000 of gross gains. Proceeds from matured debt securities available for sale totaled $5.8 million. Debt securities available for sale having a carrying value of $567.8 million and $822.2 million, at September 30, 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 September 30, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: 6. Debt Securities Available for Sale (continued) September 30, 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 $ 9,804 $ (97) $ — $ — $ 9,804 $ (97) Mortgage-backed securities and collateralized mortgage obligations 694,865 (8,178) 61,308 (917) 756,173 (9,095) Corporate debt securities 4,996 (4) 4,775 (225) 9,771 (229) $ 709,665 $ (8,279) $ 66,083 $ (1,142) $ 775,748 $ (9,421) 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 September 30, 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 September 30, 2021 totaled 83, compared with 40 at December 31, 2020. All temporarily impaired securities were investment grade as of September 30, 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 and nine months ended September 30, 2021 and 2020. Debt securities held to maturity at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 44,870 $ — $ (489) $ 44,381 Mortgage-backed securities and collateralized mortgage obligations 363,218 10,088 (419) 372,887 $ 408,088 $ 10,088 $ (908) $ 417,268 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 securities held to maturity at September 30, 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. September 30, 2021 Amortized Cost Fair Value (In thousands) More than one year to five years $ 14,875 $ 14,857 More than five years to ten years 19,995 19,685 More than ten years 10,000 9,839 44,870 44,381 Mortgage-backed securities and collateralized mortgage obligations 363,218 372,887 $ 408,088 $ 417,268 Mortgage-backed securities and collateralized mortgage obligations totaling $363.2 million at amortized cost, and $372.9 million at fair value at September 30, 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 and nine months ended September 30, 2021, there were no sales or maturities of debt securities held to maturity. During the nine months ended September 30, 2021, proceeds from called debt securities held to maturity totaled $5.1 million, resulting in no gross gains or losses. During the three and nine months ended September 30, 2020, there were no sales or maturities of debt securities held to maturity. During the three and nine months ended September 30, 2020, proceeds from called debt securities held to maturity totaled $20.0 million, resulting in no gross gains or losses. 7. Debt Securities Held to Maturity (continued) Debt securities held to maturity having a carrying value of $256.9 million and $220.5 million, at September 30, 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 September 30, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: September 30, 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 $ 44,381 $ (489) $ — $ — $ 44,381 $ (489) Mortgage-backed securities and collateralized mortgage obligations 18,804 (419) — — 18,804 (419) $ 63,185 $ (908) $ — $ — $ 63,185 $ (908) 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 September 30, 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 September 30, 2021 totaled ten, compared with two at December 31, 2020. All temporarily impaired securities were investment grade as of September 30, 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 nine months ended September 30, 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 September 30, 2021 and December 31, 2020 was $2.8 million and $5.4 million, respectively. The Company recorded a net (decrease) in the fair value of equity securities of $(443,000) and $(1.8) million, during the three and nine months ended September 30, 2021, respectively, as a component of non-interest income. During the three and nine months ended September 30, 2020, the Company recorded a net (decrease) increase in the fair value of equity securities of $(4,000) and $55,000, respectively, as a component of non-interest income.

Debt Securities Held to Maturit

Debt Securities Held to Maturity	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Debt Securities Held to Maturity	Debt Securities Available for Sale D ebt securities available for sale at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 38,651 $ 749 $ (97) $ 39,303 Mortgage-backed securities and collateralized mortgage obligations 1,638,630 21,077 (9,095) 1,650,612 Municipal obligations 10,190 20 — 10,210 Corporate debt securities 62,743 2,227 (229) 64,741 $ 1,750,214 $ 24,073 $ (9,421) $ 1,764,866 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 September 30, 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. 6. Debt Securities Available for Sale (continued) September 30, 2021 Amortized Cost Fair Value (In thousands) One year or less $ 6,944 $ 6,944 More than one year to five years 68,415 70,837 More than five years to ten years 36,225 36,473 $ 111,584 $ 114,254 Mortgage-backed securities and collateralized mortgage obligations 1,638,630 1,650,612 $ 1,750,214 $ 1,764,866 Mortgage-backed securities and collateralized mortgage obligations totaling $1.6 billion at amortized cost, and $1.7 billion at fair value, are not classified by maturity in the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. During the three months ended September 30, 2021, the sales of debt securities available for sale totaled $22.5 million, resulting in a gross gains of $2.0 million and no gross losses. Proceeds from called debt securities available for sale totaled $9.0 million, resulting in no gross gains or losses. No debt securities available for sale matured during the quarter. During the nine months ended September 30, 2021, the sale of debt securities available for sale totaled $27.2 million, resulting in a gross gains of $2.0 million and gross losses of $281,000. Proceeds from called debt securities available for sale totaled $14.0 million, resulting in no gross gains or losses. Proceeds from matured debt securities available for sale totaled $210,000. During the three months ended September 30, 2020, there were no sales, calls or matured debt securities available for sale. During the nine months ended September 30, 2020, the sale of debt securities available for sale totaled $20.8 million, resulting in gross gains of $369,000. Proceeds from called debt securities available for sale totaled $6.6 million, resulting in $1,000 of gross gains. Proceeds from matured debt securities available for sale totaled $5.8 million. Debt securities available for sale having a carrying value of $567.8 million and $822.2 million, at September 30, 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 September 30, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: 6. Debt Securities Available for Sale (continued) September 30, 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 $ 9,804 $ (97) $ — $ — $ 9,804 $ (97) Mortgage-backed securities and collateralized mortgage obligations 694,865 (8,178) 61,308 (917) 756,173 (9,095) Corporate debt securities 4,996 (4) 4,775 (225) 9,771 (229) $ 709,665 $ (8,279) $ 66,083 $ (1,142) $ 775,748 $ (9,421) 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 September 30, 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 September 30, 2021 totaled 83, compared with 40 at December 31, 2020. All temporarily impaired securities were investment grade as of September 30, 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 and nine months ended September 30, 2021 and 2020. Debt securities held to maturity at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 44,870 $ — $ (489) $ 44,381 Mortgage-backed securities and collateralized mortgage obligations 363,218 10,088 (419) 372,887 $ 408,088 $ 10,088 $ (908) $ 417,268 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 securities held to maturity at September 30, 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. September 30, 2021 Amortized Cost Fair Value (In thousands) More than one year to five years $ 14,875 $ 14,857 More than five years to ten years 19,995 19,685 More than ten years 10,000 9,839 44,870 44,381 Mortgage-backed securities and collateralized mortgage obligations 363,218 372,887 $ 408,088 $ 417,268 Mortgage-backed securities and collateralized mortgage obligations totaling $363.2 million at amortized cost, and $372.9 million at fair value at September 30, 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 and nine months ended September 30, 2021, there were no sales or maturities of debt securities held to maturity. During the nine months ended September 30, 2021, proceeds from called debt securities held to maturity totaled $5.1 million, resulting in no gross gains or losses. During the three and nine months ended September 30, 2020, there were no sales or maturities of debt securities held to maturity. During the three and nine months ended September 30, 2020, proceeds from called debt securities held to maturity totaled $20.0 million, resulting in no gross gains or losses. 7. Debt Securities Held to Maturity (continued) Debt securities held to maturity having a carrying value of $256.9 million and $220.5 million, at September 30, 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 September 30, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: September 30, 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 $ 44,381 $ (489) $ — $ — $ 44,381 $ (489) Mortgage-backed securities and collateralized mortgage obligations 18,804 (419) — — 18,804 (419) $ 63,185 $ (908) $ — $ — $ 63,185 $ (908) 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 September 30, 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 September 30, 2021 totaled ten, compared with two at December 31, 2020. All temporarily impaired securities were investment grade as of September 30, 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 nine months ended September 30, 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 September 30, 2021 and December 31, 2020 was $2.8 million and $5.4 million, respectively. The Company recorded a net (decrease) in the fair value of equity securities of $(443,000) and $(1.8) million, during the three and nine months ended September 30, 2021, respectively, as a component of non-interest income. During the three and nine months ended September 30, 2020, the Company recorded a net (decrease) increase in the fair value of equity securities of $(4,000) and $55,000, respectively, as a component of non-interest income.

Equity Securities at Fair Value

Equity Securities at Fair Value	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Equity Securities at Fair Value	Debt Securities Available for Sale D ebt securities available for sale at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 38,651 $ 749 $ (97) $ 39,303 Mortgage-backed securities and collateralized mortgage obligations 1,638,630 21,077 (9,095) 1,650,612 Municipal obligations 10,190 20 — 10,210 Corporate debt securities 62,743 2,227 (229) 64,741 $ 1,750,214 $ 24,073 $ (9,421) $ 1,764,866 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 September 30, 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. 6. Debt Securities Available for Sale (continued) September 30, 2021 Amortized Cost Fair Value (In thousands) One year or less $ 6,944 $ 6,944 More than one year to five years 68,415 70,837 More than five years to ten years 36,225 36,473 $ 111,584 $ 114,254 Mortgage-backed securities and collateralized mortgage obligations 1,638,630 1,650,612 $ 1,750,214 $ 1,764,866 Mortgage-backed securities and collateralized mortgage obligations totaling $1.6 billion at amortized cost, and $1.7 billion at fair value, are not classified by maturity in the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. During the three months ended September 30, 2021, the sales of debt securities available for sale totaled $22.5 million, resulting in a gross gains of $2.0 million and no gross losses. Proceeds from called debt securities available for sale totaled $9.0 million, resulting in no gross gains or losses. No debt securities available for sale matured during the quarter. During the nine months ended September 30, 2021, the sale of debt securities available for sale totaled $27.2 million, resulting in a gross gains of $2.0 million and gross losses of $281,000. Proceeds from called debt securities available for sale totaled $14.0 million, resulting in no gross gains or losses. Proceeds from matured debt securities available for sale totaled $210,000. During the three months ended September 30, 2020, there were no sales, calls or matured debt securities available for sale. During the nine months ended September 30, 2020, the sale of debt securities available for sale totaled $20.8 million, resulting in gross gains of $369,000. Proceeds from called debt securities available for sale totaled $6.6 million, resulting in $1,000 of gross gains. Proceeds from matured debt securities available for sale totaled $5.8 million. Debt securities available for sale having a carrying value of $567.8 million and $822.2 million, at September 30, 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 September 30, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: 6. Debt Securities Available for Sale (continued) September 30, 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 $ 9,804 $ (97) $ — $ — $ 9,804 $ (97) Mortgage-backed securities and collateralized mortgage obligations 694,865 (8,178) 61,308 (917) 756,173 (9,095) Corporate debt securities 4,996 (4) 4,775 (225) 9,771 (229) $ 709,665 $ (8,279) $ 66,083 $ (1,142) $ 775,748 $ (9,421) 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 September 30, 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 September 30, 2021 totaled 83, compared with 40 at December 31, 2020. All temporarily impaired securities were investment grade as of September 30, 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 and nine months ended September 30, 2021 and 2020. Debt securities held to maturity at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 44,870 $ — $ (489) $ 44,381 Mortgage-backed securities and collateralized mortgage obligations 363,218 10,088 (419) 372,887 $ 408,088 $ 10,088 $ (908) $ 417,268 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 securities held to maturity at September 30, 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. September 30, 2021 Amortized Cost Fair Value (In thousands) More than one year to five years $ 14,875 $ 14,857 More than five years to ten years 19,995 19,685 More than ten years 10,000 9,839 44,870 44,381 Mortgage-backed securities and collateralized mortgage obligations 363,218 372,887 $ 408,088 $ 417,268 Mortgage-backed securities and collateralized mortgage obligations totaling $363.2 million at amortized cost, and $372.9 million at fair value at September 30, 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 and nine months ended September 30, 2021, there were no sales or maturities of debt securities held to maturity. During the nine months ended September 30, 2021, proceeds from called debt securities held to maturity totaled $5.1 million, resulting in no gross gains or losses. During the three and nine months ended September 30, 2020, there were no sales or maturities of debt securities held to maturity. During the three and nine months ended September 30, 2020, proceeds from called debt securities held to maturity totaled $20.0 million, resulting in no gross gains or losses. 7. Debt Securities Held to Maturity (continued) Debt securities held to maturity having a carrying value of $256.9 million and $220.5 million, at September 30, 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 September 30, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: September 30, 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 $ 44,381 $ (489) $ — $ — $ 44,381 $ (489) Mortgage-backed securities and collateralized mortgage obligations 18,804 (419) — — 18,804 (419) $ 63,185 $ (908) $ — $ — $ 63,185 $ (908) 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 September 30, 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 September 30, 2021 totaled ten, compared with two at December 31, 2020. All temporarily impaired securities were investment grade as of September 30, 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 nine months ended September 30, 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 September 30, 2021 and December 31, 2020 was $2.8 million and $5.4 million, respectively. The Company recorded a net (decrease) in the fair value of equity securities of $(443,000) and $(1.8) million, during the three and nine months ended September 30, 2021, respectively, as a component of non-interest income. During the three and nine months ended September 30, 2020, the Company recorded a net (decrease) increase in the fair value of equity securities of $(4,000) and $55,000, respectively, as a component of non-interest income.

Loans Receivable and Allowance

Loans Receivable and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Loans Receivable and Allowance for Loan Losses	Loans Receivable and Allowance for Loan Losses Loans receivable at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, December 31, 2021 2020 (In thousands) Real estate loans: One-to-four family $ 1,933,876 $ 1,940,327 Multifamily and commercial 3,137,461 2,817,965 Construction 272,004 328,711 Commercial business loans 450,021 752,870 Consumer loans: Home equity loans and advances 264,111 321,177 Other consumer loans 1,772 1,497 Total gross loans 6,059,245 6,162,547 Purchased credit-impaired ("PCI") loans 2,994 6,345 Net deferred loan costs, fees and purchased premiums and discounts 22,055 12,878 Loans receivable $ 6,084,294 $ 6,181,770 The Company had no loans held-for-sale at September 30, 2021. The Company had $4.1 million of SBA loans held-for-sale at December 31, 2020. During the three months ended September 30, 2021, the Company sold $1.8 million, $15.0 million, and $1.2 million of one-to-four family real estate loans and home equity loans, multifamily and commercial real estate loans, and SBA loans held-for-sale included in commercial business loans, respectively, resulting in gross gains of $140,000 and no gross losses. During the nine months ended September 30, 2021, the Company sold $17.4 million, $19.1 million, $250.1 million, and $6.4 million of one-to-four family real estate loans and home equity loans, multifamily and commercial real estate loans, commercial business and SBA loans, and construction loans held-for-sale, respectively, resulting in gross gains of $8.6 million and no gross losses. During the three months ended September 30, 2020, the Company sold $7.8 million of one-to-four family real estate loans held-for-sale, resulting in gross gains of $327,000 and no gross losses. During the nine months ended September 30, 2020, the Company sold $111.8 million of one-to-four family real estate loans held-for-sale resulting in gross gains of $1.7 million and no gross losses. During the three and nine months ended September 30, 2021, no loans included in loans receivable were sold by the Company. During the three months ended September 30, 2020, the Company sold a construction loan totaling $5.8 million included in loans receivable, resulting in no gross gain or loss. During the three months ended September 30, 2020, the Company sold an SBA loan totaling $274,000 included in loans receivable, resulting in a gross gain of $23,000. During the nine months ended September 30, 2020, the Company sold $8.8 million, $12.5 million, and $7.6 million of one-to-four family real estate and home equity loans, construction loans, and commercial business and SBA loans, respectively, included in loans receivable, resulting in gross gains of $82,000, $0, and $78,000, respectively, and no gross losses. During the three months ended September 30, 2021, the Company purchased $678,000 of one-to-four family real estate loans and $2.0 million of multifamily and commercial real estate loans from third parties. During the nine months ended September 30, 2021, the Company purchased $678,000 of one-to-four family real estate loans and $73.6 million of multifamily and commercial real estate loans from third parties. During the three and nine months ended September 30, 2020, no loans were purchased by the Company. At September 30, 2021 and December 31, 2020, commercial business loans included $69.2 million and $344.4 million, respectively, in SBA Payroll Protection Program ("PPP") loans and net deferred fees related to these loans totaling $1.9 million and $6.6 million, respectively. 9. Loans Receivable and Allowance for Loan Losses (continued) The Company has entered into guarantor swaps with Freddie Mac which results in improved liquidity. During the three months ended September 30, 2021, no loans were exchanged for Freddie Mac mortgage participation certificates. During the nine months ended September 30, 2021, the Company exchanged $99.6 million of loans for Freddie Mac mortgage participation certificates, resulting in gross gains of $2.3 million and no gross losses. During the three and nine months ended September 30, 2020, $48.5 million of loans were exchanged for Freddie Mac mortgage participation certificates, resulting in gross gains of $1.5 million and no gross losses. The Company retained the servicing of these loans. At September 30, 2021 and December 31, 2020, the carrying value of loans serviced by the Company for investors was $551.1 million and $598.0 million, respectively. These loans are not included in the Consolidated Statements of Financial Condition. The following tables summarize the aging of loans receivable by portfolio segment, including non-accrual loans and excluding PCI loans at September 30, 2021 and December 31, 2020: September 30, 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 $ 1,274 $ 1,370 $ 968 $ 3,612 $ 1,991 $ 1,930,264 $ 1,933,876 Multifamily and commercial 486 1,740 2,433 4,659 2,433 3,132,802 3,137,461 Construction 107 — — 107 — 271,897 272,004 Commercial business loans 225 400 493 1,118 523 448,903 450,021 Consumer loans: Home equity loans and advances 174 125 59 358 319 263,753 264,111 Other consumer loans — — — — — 1,772 1,772 Total loans $ 2,266 $ 3,635 $ 3,953 $ 9,854 $ 5,266 $ 6,049,391 $ 6,059,245 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 $ 1,934,446 $ 1,940,327 Multifamily and commercial 15,645 — 1,238 16,883 1,873 2,801,082 2,817,965 Construction 550 — — 550 — 328,161 328,711 Commercial business loans 2,343 1,056 2,453 5,852 2,968 747,018 752,870 Consumer loans: Home equity loans and advances 1,156 696 394 2,246 678 318,931 321,177 Other consumer loans 4 — — 4 — 1,493 1,497 Total loans $ 22,766 $ 2,664 $ 5,986 $ 31,416 $ 8,156 $ 6,131,131 $ 6,162,547 9. Loans Receivable and Allowance for Loan Losses (continued) 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 September 30, 2021 and December 31, 2020, non-accrual loans totaled $5.3 million and $8.2 million, respectively. Included in non-accrual loans at September 30, 2021, are thirteen loans totaling $1.3 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 September 30, 2021 and December 31, 2020, there were no loans past due 90 days or more still accruing interest other than COVID-19 related loan forbearance 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. 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 $2.8 million at September 30, 2021 and $6.1 million at December 31, 2020. PCI loans acquired in the Roselle acquisition totaled $184,000 at September 30, 2021 and $246,000 at December 31, 2020. The following table presents changes in accretable yield for PCI loans for the three and nine months ended September 30, 2021 and 2020. Three Months Ended Nine Months Ended 2021 2020 2021 2020 (In thousands) Balance at beginning of period $ 375 $ 471 $ 418 $ 511 Acquisition — — — 58 Accretion (27) (58) (91) (156) Net change in expected cash flows 4 1 25 1 Balance at end of period $ 352 $ 414 $ 352 $ 414 We may obtain physical possession of real estate collateralizing a residential mortgage loan via foreclosure or through an in-substance repossession. At September 30, 2021 and December 31, 2020, the Company had no real estate owned. At September 30, 2021 we had one residential mortgage loan with a carrying value of $86,000 collateralized by residential real estate which was in the process of 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. In March 2020, the Company temporarily suspended residential property foreclosure sales and evictions in the primary states in which we lend, as the federal government and various states issued executive orders which declared moratoriums on removing individuals from a residential property until at least two months after the COVID-19 health crisis ended. Many of these moratoriums expired in the second and third quarters of 2021. In New Jersey and New York the moratoriums will expire on November 15, 2021 and January 15, 2022, respectively. 9. Loans Receivable and Allowance for Loan Losses (continued) The following tables summarize loans receivable (including PCI loans) and allowance for loan losses by portfolio segment and impairment method at September 30, 2021 and December 31, 2020: September 30, 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 $ 264 $ 96 $ — $ 14 $ 5 $ — $ 379 Collectively evaluated for impairment 14,524 26,137 9,482 18,711 1,087 6 69,947 Loans acquired with deteriorated credit quality — — — — — — — Total $ 14,788 $ 26,233 $ 9,482 $ 18,725 $ 1,092 $ 6 $ 70,326 Total loans: Individually evaluated for impairment $ 5,471 $ 18,210 $ — $ 2,089 $ 727 $ — $ 26,497 Collectively evaluated for impairment 1,928,405 3,119,251 272,004 447,932 263,384 1,772 6,032,748 Loans acquired with deteriorated credit quality 233 1,779 — 982 — — 2,994 Total loans $ 1,934,109 $ 3,139,240 $ 272,004 $ 451,003 $ 264,111 $ 1,772 $ 6,062,239 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 were 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. The following tables present the number of loans modified as TDRs during the three and nine months ended September 30, 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. 9. Loans Receivable and Allowance for Loan Losses (continued) For the Three Months Ended September 30, 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: One-to-four family 1 $ 64 $ 66 — $ — $ — Multifamily and commercial — — — 4 16,387 16,387 Commercial business loans — — — 1 1,295 1,295 Total restructured loans 1 $ 64 $ 66 5 $ 17,682 $ 17,682 For the Nine Months Ended September 30, 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: One-to-four family 2 $ 285 $ 388 — $ — $ — Multifamily and commercial 1 192 211 4 16,387 16,387 Commercial business loans — — — 2 11,507 12,802 Total restructured loans 3 $ 477 $ 599 6 $ 27,894 $ 29,189 9. Loans Receivable and Allowance for Loan Losses (continued) The activity in the allowance for loan losses by portfolio segment for the three and nine months ended September 30, 2021 and 2020 are as follows: For the Three Months Ended September 30, 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 $ 17,108 $ 26,256 $ 9,160 $ 15,898 $ 1,471 $ 5 $ 69,898 Provision charged (credited) (2,218) (317) 322 2,854 (165) 4 480 Recoveries 4 294 — 42 7 — 347 Charge-offs (106) — — (69) (221) (3) (399) Balance at end of period $ 14,788 $ 26,233 $ 9,482 $ 18,725 $ 1,092 $ 6 $ 70,326 2020 Balance at beginning of period $ 16,633 $ 27,330 $ 10,217 $ 18,314 $ 1,514 $ 7 $ 74,015 Provision charged (credited) (758) 3,659 317 (573) (129) — 2,516 Recoveries 87 — — 128 32 — 247 Charge-offs (187) — — (367) (91) — (645) Balance at end of period $ 15,775 $ 30,989 $ 10,534 $ 17,502 $ 1,326 $ 7 $ 76,133 For the Nine Months Ended September 30, 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) 1,796 (5,117) (1,790) 2,945 (400) 5 (2,561) Recoveries 18 1,231 1 169 52 — 1,471 Charge-offs (612) (562) — (1,773) (308) (5) (3,260) Balance at end of period $ 14,788 $ 26,233 $ 9,482 $ 18,725 $ 1,092 $ 6 $ 70,326 2020 Balance at beginning of period $ 13,780 $ 22,980 $ 7,435 $ 15,836 $ 1,669 $ 9 $ 61,709 Provision charged (credited) 2,292 7,998 3,098 4,685 (253) — 17,820 Recoveries 329 12 1 211 55 — 608 Charge-offs (626) (1) — (3,230) (145) (2) (4,004) Balance at end of period $ 15,775 $ 30,989 $ 10,534 $ 17,502 $ 1,326 $ 7 $ 76,133 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 September 30, 2021 and December 31, 2020: At September 30, 2021 Recorded Investment Unpaid Principal Balance Specific Allowance (In thousands) With no allowance recorded: Real estate loans: One-to-four family $ 2,533 $ 2,533 $ — Multifamily and commercial 16,223 16,223 — Commercial business loans 591 591 — Consumer loans: Home equity loans and advances 521 521 — 19,868 19,868 — With a specific allowance recorded: Real estate loans: One-to-four family 2,938 2,938 264 Multifamily and commercial 1,987 1,987 96 Commercial business loans 1,498 1,497 14 Consumer loans: Home equity loans and advances 206 206 5 6,629 6,628 379 Total: Real estate loans: One-to-four family 5,471 5,471 264 Multifamily and commercial 18,210 18,210 96 Commercial business loans 2,089 2,088 14 Consumer loans: Home equity loans and advances 727 727 5 Total loans $ 26,497 $ 26,496 $ 379 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 $379,000 and $1.1 million at September 30, 2021 and December 31, 2020, respectively. At September 30, 2021 and December 31, 2020, impaired loans for which there was no related allowance for loan losses totaled $19.9 million and $19.1 million, respectively. The recorded investment in TDRs totaled $23.5 million at September 30, 2021, of which one loan with a balance of $45,000 was 30-59 days past due, and one loan with a balance of $400,000 was 60-89 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 September 30, 2021. The recorded investment in TDRs totaled $45.4 million at December 31, 2020, of which one loan with a balance of $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 and nine months ended September 30, 2021 and 2020: For the Three Months Ended September 30, 2021 2020 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (In thousands) Real estate loans: One-to-four family $ 5,569 $ 64 $ 8,020 $ 74 Multifamily and commercial 26,103 227 23,525 227 Commercial business loans 2,106 36 4,979 52 Consumer loans: Home equity loans and advances 1,101 11 1,935 28 Total loans $ 34,879 $ 338 $ 38,459 $ 381 For the Nine Months Ended September 30, 2021 2020 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (In thousands) Real estate loans: One-to-four family $ 5,923 $ 229 $ 8,175 $ 226 Multifamily and commercial 28,246 688 20,670 653 Commercial business loans 2,226 106 5,468 196 Consumer loans: Home equity loans and advances 1,257 32 1,995 85 Total loans $ 37,652 $ 1,055 $ 36,308 $ 1,160 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. 9. Loans Receivable and Allowance for Loan Losses (continued) The following tables present loans receivable by credit quality risk indicator and by loan segment, excluding PCI loans at September 30, 2021 and December 31, 2020: September 30, 2021 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Pass $ 1,927,870 $ 3,052,850 $ 271,897 $ 427,793 $ 263,650 $ 1,772 $ 5,945,832 Special mention 388 52,562 107 9,787 — — 62,844 Substandard 5,618 32,049 — 12,441 461 — 50,569 Doubtful — — — — — — — Loss — — — — — — — Total $ 1,933,876 $ 3,137,461 $ 272,004 $ 450,021 $ 264,111 $ 1,772 $ 6,059,245 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	9 Months Ended
	Sep. 30, 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 September 30, 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 September 30, 2021 and December 31, 2020, the weighted average remaining lease term for operating leases was 6.9 years and 7.5 years, respectively, and the weighted average discount rate used in the measurement of operating lease liabilities was 2.14%, and 2.26%, respectively. 10. Leases (continued) 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 September 30, 2021 and 2020, operating and variable lease expenses totaled approximately $504,000 and $603,000, respectively. During the nine months ended September 30, 2021 and 2020, operating and variable lease expenses totaled approximately $1.7 million and $1.9 million, respectively. There were no sale and leaseback transactions, leveraged leases or lease transactions with related parties during the three and nine months ended September 30, 2021 and 2020. At September 30, 2021, the Company had no leases that had not yet commenced. The following table summarizes lease payment obligations for each of the next five years and thereafter as follows: At September 30, 2021 Lease Payment Obligations (In thousands) One year or less $ 1,026 After one year to two years 4,008 After two years to three years 3,739 After three years to four years 3,014 After four years to five years 2,342 Thereafter 6,662 Total undiscounted cash flows 20,791 Discount on cash flows (1,663) Total lease liability $ 19,128

Deposits

Deposits	9 Months Ended
	Sep. 30, 2021
Deposits [Abstract]
Deposits	Deposits Deposits at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, December 31, 2021 2020 (In thousands) Non-interest-bearing demand $ 1,567,112 $ 1,354,605 Interest-bearing demand 2,451,718 2,189,164 Money market accounts 636,392 588,180 Savings and club deposits 775,681 688,309 Certificates of deposit 1,791,455 1,958,366 Total deposits $ 7,222,358 $ 6,778,624 Included in the above balances at September 30, 2021 and December 31, 2020 are certificates of deposit obtained through brokers, totaling $16.2 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 $934.9 million and $1.0 billion at September 30, 2021 and December 31, 2020, respectively. Interest expense on deposits for the three months ended September 30, 2021 and 2020 totaled $6.7 million and $12.8 million, respectively. Interest expense on deposits for the nine months ended September 30, 2021 and 2020 totaled $23.4 million and $44.6 million, respectively. 11. Deposits (continued) Scheduled maturities of certificates of deposit accounts at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, December 31, 2021 2020 (In thousands) One year or less $ 1,193,342 $ 1,494,129 After one year to two years 365,668 337,579 After two years to three years 120,496 52,809 After three years to four years 29,925 23,018 After four years 82,024 50,831 $ 1,791,455 $ 1,958,366

Stock Based Compensation

Stock Based Compensation	9 Months Ended
	Sep. 30, 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 22, 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 September 30, 2021 and 2020, approximately $1.4 million in expense was recognized in regard to these awards. The expected future compensation expense related to the 1,105,634 non-vested restricted shares outstanding at September 30, 2021 is approximately $9.7 million over a weighted average period of 2.1 years. During the nine months ended September 30, 2021 and 2020, approximately $4.3 million and $4.2 million in expense was recognized in regard to these awards. 12. Stock Based Compensation (continued) The following is a summary of the Company's restricted stock activity during the three and nine months ended September 30, 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 Forfeited (128) 15.60 Non-vested at June 30, 2021 1,299,398 $ 15.74 Vested (163,882) 15.61 Forfeited (29,882) 15.63 Non-vested at September 30, 2021 1,105,634 $ 15.76 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 Forfeited (240) 15.60 Non-vested at June 30, 2020 1,418,891 $ 15.67 Vested (167,427) 15.62 Forfeited (15,390) 16.07 Non-vested at September 30, 2020 1,236,074 $ 15.68 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%. 12. Stock Based Compensation (continued) 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 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 6.0 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 September 30, 2021 and 2020, approximately $822,000 and $808,000 in expense was recognized in regard to these awards. During the nine months ended September 30, 2021 and 2020, approximately $2.4 million and $2.4 million in expense was recognized in regard to these awards. The expected future compensation expense related to the 2,278,056 non-vested options outstanding at September 30, 2021 is $9.0 million over a weighted average period of 2.8 years. The following is a summary of the Company's option activity during the three and nine months ended September 30, 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 Exercised (1,661) 15.60 — — Expired (7,529) 15.60 — — Forfeited (1,412) 15.60 — — Outstanding, June 30, 2021 3,775,533 $ 15.73 8.1 $ 5,700,258 Exercised (26,861) 15.60 — — Expired (353) 15.60 — — Forfeited (58,287) 15.73 — — Outstanding, September 30, 2021 3,690,032 $ 15.73 7.9 $ 10,222,527 Options exercisable at September 30, 2021 1,411,976 $ 15.64 7.8 $ 4,036,196 12. Stock Based Compensation (continued) 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 $ — Forfeited (2,647) 15.60 — — Outstanding, June 30, 2020 3,771,690 $ 15.67 9.1 $ — Forfeited (44,485) 15.95 — — Outstanding, September 30, 2020 3,727,205 $ 15.67 8.8 $ — Options exercisable at September 30, 2020 727,438 $ 15.62 8.7 $ — 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. During the three and nine months ended September 30, 2021, the aggregate intrinsic value of options exercised was $56,186 and $59,991, respectively. There were no stock option exercises during the three and nine months ended September 30, 2020.

Components of Net Periodic Bene

Components of Net Periodic Benefit Costs	9 Months Ended
	Sep. 30, 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. 13. Components of Net Periodic Benefit Cost (continued) Net periodic benefit (income) cost for Pension Plan, RIM Plan, Post-retirement Plan and Split-dollar Life Insurance plan benefits for the three and nine months ended September 30, 2021 and 2020, includes the following components: For the Three Months Ended September 30, 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 $ 1,872 $ 2,032 $ 100 $ 67 $ 130 $ 99 $ 141 $ 120 Compensation and employee benefits Interest cost 1,902 1,824 86 102 141 171 125 135 Other non-interest expense Expected return on plan assets (6,661) (5,908) — — — — — — Other non-interest expense Amortization: Prior service cost — — — — — — 14 14 Other non-interest expense Net loss — 1,492 166 99 153 77 191 113 Other non-interest expense Net periodic (income) benefit cost $ (2,887) $ (560) $ 352 $ 268 $ 424 $ 347 $ 471 $ 382 For the Nine Months Ended September 30, 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 $ 6,172 $ 5,906 $ 300 $ 201 $ 390 $ 297 $ 423 $ 346 Compensation and employee benefits Interest cost 5,414 5,887 258 306 423 513 375 384 Other non-interest expense Expected return on plan assets (19,297) (17,383) — — — — — — Other non-interest expense Amortization: Prior service cost — — — — — — 42 42 Other non-interest expense Net loss 2,000 3,054 498 297 459 231 573 339 Other non-interest expense Net periodic (income) benefit cost $ (5,711) $ (2,536) $ 1,056 $ 804 $ 1,272 $ 1,041 $ 1,413 $ 1,111 For the three and nine months ended September 30, 2021, a $35.0 million contribution was made to the Pension Plan. The net periodic (income) cost for pension benefits, other post-retirement and split dollar life insurance benefits for the three and nine months ended September 30, 2021 were calculated using the most recent available benefit valuations. 13. Components of Net Periodic Benefit Cost (continued) 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 and nine months ended September 30, 2021 and 2020, the Company recorded a net periodic benefit cost of $2,000 and $4,000, and $6,000 and $8,000, respectively, in connection with this plan.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 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. 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 September 30, 2021 and December 31, 2020. 14. Fair Value Measurements (continued) 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 September 30, 2021 and December 31, 2020, by level within the fair value hierarchy: September 30, 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 $ 39,303 $ 35,194 $ 4,109 $ — Mortgage-backed securities and collateralized mortgage obligations 1,650,612 — 1,650,612 — Municipal obligations 10,210 — 10,210 — Corporate debt securities 64,741 — 64,741 — Trust preferred securities — — — — Total debt securities available for sale 1,764,866 35,194 1,729,672 — Equity securities 2,785 2,439 346 — Derivative assets 11,464 — 11,464 — $ 1,779,115 $ 37,633 $ 1,741,482 $ — Derivative liabilities $ 25,068 $ — $ 25,068 $ — 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 September 30, 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 September 30, 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 September 30, 2021 and December 31, 2020, by level within the fair value hierarchy: September 30, 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 $ 1,213 $ — $ — $ 1,213 Mortgage servicing rights 2,057 — — 2,057 $ 3,270 $ — $ — $ 3,270 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 September 30, 2021 and December 31, 2020: September 30, 2021 Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Weighted Average (Dollars in thousands) Impaired loans $ 1,213 Other Contracted sale price of collateral — % — % Mortgage servicing rights 2,057 Discounted cash flow Prepayment speeds and discount rates (1) 7.5% - 25.0% 12.3 % 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 (1) 9.7% - 26.2% 16.7 % (1) 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 September 30, 2021 and December 31, 2020: September 30, 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 $ 298,488 $ 298,488 $ 298,488 $ — $ — Debt securities available for sale 1,764,866 1,764,866 35,194 1,729,672 — Debt securities held to maturity 408,088 417,268 — 417,268 — Equity securities 2,785 2,785 2,439 346 — Federal Home Loan Bank stock 40,891 40,891 — 40,891 — Loans receivable, net 6,013,968 6,230,842 — — 6,230,842 Derivative assets 11,464 11,464 — 11,464 — Financial liabilities: Deposits $ 7,222,358 $ 7,224,770 $ — $ 7,224,770 $ — Borrowings 749,631 753,800 — 753,800 — Derivative liabilities 25,068 25,068 — 25,068 — 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)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The following tables present the components of other comprehensive income (loss), both gross and net of tax, for the three and nine months ended September 30, 2021 and 2020: For the Three Months Ended September 30, 2021 2020 Before Tax Tax Effect After Tax Before Tax Tax Effect After Tax (In thousands) Components of other comprehensive income (loss): Unrealized (loss) on debt securities available for sale: $ (13,609) $ 3,666 $ (9,943) $ (3,688) $ 775 $ (2,913) Accretion of unrealized (loss) on debt securities reclassified as held to maturity (3) 1 (2) (4) — (4) Reclassification adjustment for gain included in net income 2,296 (505) 1,791 — — — (11,316) 3,162 (8,154) (3,692) 775 (2,917) Derivatives: Unrealized gain on swap contracts accounted for as cash flow hedges 2,035 (568) 1,467 2,256 (471) 1,785 2,035 (568) 1,467 2,256 (471) 1,785 Employee benefit plans: Amortization of prior service cost included in net income (14) 4 (10) (14) 3 (11) Reclassification adjustment of actuarial net (loss) included in net income (1,511) 422 (1,089) (1,071) 225 (846) Change in funded status of retirement obligations 3,050 (852) 2,198 (41,434) 8,701 (32,733) 1,525 (426) 1,099 (42,519) 8,929 (33,590) Total other comprehensive income (loss) $ (7,756) $ 2,168 $ (5,588) $ (43,955) $ 9,233 $ (34,722) 15. Other Comprehensive Income (Loss) (continued) For the Nine Months Ended September 30, 2021 2020 Before Tax Tax Effect After Tax Before Tax Tax Effect After Tax (In thousands) Components of other comprehensive income (loss): Unrealized (loss) gain on debt securities available for sale: $ (26,804) $ 4,615 $ (22,189) $ 28,736 $ (6,031) $ 22,705 Accretion of unrealized (loss) gain on debt securities reclassified as held to maturity (24) 24 — 1 — 1 Reclassification adjustment for (loss) gain included in net income 2,015 (426) 1,589 370 (81) 289 (24,813) 4,213 (20,600) 29,107 (6,112) 22,995 Derivatives: Unrealized gain (loss) on swap contracts accounted for as cash flow hedges 9,182 (1,084) 8,098 (13,050) 2,736 (10,314) 9,182 (1,084) 8,098 (13,050) 2,736 (10,314) Employee benefit plans: Amortization of prior service cost included in net income (42) 11 (31) (42) 10 (32) Reclassification adjustment of actuarial net (loss) included in net income (4,533) 1,266 (3,267) (3,213) 674 (2,539) Change in funded status of retirement obligations 40,541 (3,971) 36,570 (37,093) 7,789 (29,304) 35,966 (2,694) 33,272 (40,348) 8,473 (31,875) Total other comprehensive income (loss) $ 20,335 $ 435 $ 20,770 $ (24,291) $ 5,097 $ (19,194) 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 and nine months ended September 30, 2021 and 2020: For the Three Months Ended September 30, 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 $ 18,582 $ (10,225) $ (51,624) $ (43,267) $ 35,225 $ (20,573) $ (67,859) $ (53,207) Current period changes in other comprehensive income (loss) (8,154) 1,467 1,099 (5,588) (2,917) 1,785 (33,590) (34,722) Total other comprehensive income (loss) $ 10,428 $ (8,758) $ (50,525) $ (48,855) $ 32,308 $ (18,788) $ (101,449) $ (87,929) For the Nine Months Ended September 30, 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) $ 9,313 $ (8,474) $ (69,574) $ (68,735) Current period changes in other comprehensive income (loss) (20,600) 8,098 33,272 20,770 22,995 (10,314) (31,875) (19,194) Total other comprehensive income (loss) $ 10,428 $ (8,758) $ (50,525) $ (48,855) $ 32,308 $ (18,788) $ (101,449) $ (87,929) 15. Other Comprehensive Income (Loss) (continued) 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 and nine months ended September 30, 2021 and 2020: Accumulated Other Comprehensive Income (Loss) Components For the Three Months Ended September 30, Affected Line Items in the Consolidated Statements of Income 2021 2020 (In thousands) Reclassification adjustment for gain included in net income $ 2,296 $ — Gain on securities transactions Reclassification adjustment of actuarial net (loss) included in net income (1,511) (1,071) Other non-interest expense Total before tax 785 (1,071) Income (tax) benefit (83) 225 Net of tax $ 702 $ (846) Accumulated Other Comprehensive Income (Loss) Components For the Nine Months Ended September 30, Affected Line Items in the Consolidated Statements of Income 2021 2020 (In thousands) Reclassification adjustment for gain included in net income $ 2,015 $ 370 Gain on securities transactions Reclassification adjustment of actuarial net (loss) included in net income (4,533) (3,213) Other non-interest expense Total before tax (2,518) (2,843) Income (tax) benefit 840 593 Net of tax $ (1,678) $ (2,250)

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
	Sep. 30, 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 September 30, 2021 and December 31, 2020, the Company had no currency forward contracts in place with commercial banking customers. Interest Rate Swaps. At both September 30, 2021 and December 31, 2020, the Company had interest rate swaps in place with 50 commercial banking customers executed by offsetting interest rate swaps with third parties, with an aggregated notional amount of $180.1 million. These derivatives are not designated as hedges and are not speculative. These interest rate swaps do not meet hedge accounting requirements. At September 30, 2021 and December 31, 2020, the Company had 28 and 31 interest rate swaps with notional amounts of $400.0 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 and nine months ended September 30, 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 September 30, 2021 and December 31, 2020: September 30, 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 $ 11,464 Other Liabilities $ 25,068 Total derivative instruments $ 11,464 $ 25,068 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 September 30, 2021 and 2020, losses/(gains) of $12,000 and $(44,000), respectively, were recorded for changes in fair value of interest rate swaps with third parties. For the nine months ended September 30, 2021 and 2020, (gains)/losses of $(189,000) and $406,000, respectively, were recorded for changes in fair value of interest rate swaps with third parties. At both September 30, 2021 and December 31, 2020, accrued interest was $1.0 million. 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	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2021 and 2020. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Non-interest income In-scope of Topic 606: Demand deposit account fees $ 986 $ 787 $ 2,682 $ 2,706 Title insurance fees 1,431 1,218 4,554 3,445 Other non-interest income 1,934 1,749 5,633 4,688 Total in-scope non-interest income 4,351 3,754 12,869 10,839 Total out-of-scope non-interest income 4,523 4,155 18,991 10,469 Total non-interest income $ 8,874 $ 7,909 $ 31,860 $ 21,308 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	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events    The Company has evaluated events subsequent to September 30, 2021 and through the financial statement issuance date of November 9, 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)	9 Months Ended
	Sep. 30, 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 5. Summary of Significant Accounting Policies Accounting Pronouncement Adopted in 2021 (continued) 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 this 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: • 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 September 30, 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 5. Summary of Significant Accounting Policies Accounting Pronouncements Not Yet Adopted (continued) 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 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. 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)	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [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)	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2021 and 2020: 3. Earnings per Share (continued) For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands, except per share data) Net income $ 20,982 $ 15,087 $ 68,715 $ 36,949 Shares: Weighted average shares outstanding - basic 102,977,254 110,983,871 104,486,520 110,177,736 Weighted average dilutive shares outstanding — — — — Weighted average shares outstanding - diluted 102,977,254 110,983,871 104,486,520 110,177,736 Earnings per share: Basic $ 0.20 $ 0.14 $ 0.66 $ 0.34 Diluted $ 0.20 $ 0.14 $ 0.66 $ 0.34

Debt Securities Available for_2

Debt Securities Available for Sale (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2021 and December 31, 2020 are summarized as follows: September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 38,651 $ 749 $ (97) $ 39,303 Mortgage-backed securities and collateralized mortgage obligations 1,638,630 21,077 (9,095) 1,650,612 Municipal obligations 10,190 20 — 10,210 Corporate debt securities 62,743 2,227 (229) 64,741 $ 1,750,214 $ 24,073 $ (9,421) $ 1,764,866 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 September 30, 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. 6. Debt Securities Available for Sale (continued) September 30, 2021 Amortized Cost Fair Value (In thousands) One year or less $ 6,944 $ 6,944 More than one year to five years 68,415 70,837 More than five years to ten years 36,225 36,473 $ 111,584 $ 114,254 Mortgage-backed securities and collateralized mortgage obligations 1,638,630 1,650,612 $ 1,750,214 $ 1,764,866 The amortized cost and fair value of debt securities held to maturity at September 30, 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. September 30, 2021 Amortized Cost Fair Value (In thousands) More than one year to five years $ 14,875 $ 14,857 More than five years to ten years 19,995 19,685 More than ten years 10,000 9,839 44,870 44,381 Mortgage-backed securities and collateralized mortgage obligations 363,218 372,887 $ 408,088 $ 417,268
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 September 30, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: 6. Debt Securities Available for Sale (continued) September 30, 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 $ 9,804 $ (97) $ — $ — $ 9,804 $ (97) Mortgage-backed securities and collateralized mortgage obligations 694,865 (8,178) 61,308 (917) 756,173 (9,095) Corporate debt securities 4,996 (4) 4,775 (225) 9,771 (229) $ 709,665 $ (8,279) $ 66,083 $ (1,142) $ 775,748 $ (9,421) 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)	9 Months Ended
	Sep. 30, 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 September 30, 2021 and December 31, 2020 are summarized as follows: September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (In thousands) U.S. government and agency obligations $ 44,870 $ — $ (489) $ 44,381 Mortgage-backed securities and collateralized mortgage obligations 363,218 10,088 (419) 372,887 $ 408,088 $ 10,088 $ (908) $ 417,268 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 September 30, 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. 6. Debt Securities Available for Sale (continued) September 30, 2021 Amortized Cost Fair Value (In thousands) One year or less $ 6,944 $ 6,944 More than one year to five years 68,415 70,837 More than five years to ten years 36,225 36,473 $ 111,584 $ 114,254 Mortgage-backed securities and collateralized mortgage obligations 1,638,630 1,650,612 $ 1,750,214 $ 1,764,866 The amortized cost and fair value of debt securities held to maturity at September 30, 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. September 30, 2021 Amortized Cost Fair Value (In thousands) More than one year to five years $ 14,875 $ 14,857 More than five years to ten years 19,995 19,685 More than ten years 10,000 9,839 44,870 44,381 Mortgage-backed securities and collateralized mortgage obligations 363,218 372,887 $ 408,088 $ 417,268
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 September 30, 2021 and December 31, 2020 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: September 30, 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 $ 44,381 $ (489) $ — $ — $ 44,381 $ (489) Mortgage-backed securities and collateralized mortgage obligations 18,804 (419) — — 18,804 (419) $ 63,185 $ (908) $ — $ — $ 63,185 $ (908) 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)	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Schedule of loans receivable	Loans receivable at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, December 31, 2021 2020 (In thousands) Real estate loans: One-to-four family $ 1,933,876 $ 1,940,327 Multifamily and commercial 3,137,461 2,817,965 Construction 272,004 328,711 Commercial business loans 450,021 752,870 Consumer loans: Home equity loans and advances 264,111 321,177 Other consumer loans 1,772 1,497 Total gross loans 6,059,245 6,162,547 Purchased credit-impaired ("PCI") loans 2,994 6,345 Net deferred loan costs, fees and purchased premiums and discounts 22,055 12,878 Loans receivable $ 6,084,294 $ 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 September 30, 2021 and December 31, 2020: September 30, 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 $ 1,274 $ 1,370 $ 968 $ 3,612 $ 1,991 $ 1,930,264 $ 1,933,876 Multifamily and commercial 486 1,740 2,433 4,659 2,433 3,132,802 3,137,461 Construction 107 — — 107 — 271,897 272,004 Commercial business loans 225 400 493 1,118 523 448,903 450,021 Consumer loans: Home equity loans and advances 174 125 59 358 319 263,753 264,111 Other consumer loans — — — — — 1,772 1,772 Total loans $ 2,266 $ 3,635 $ 3,953 $ 9,854 $ 5,266 $ 6,049,391 $ 6,059,245 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 $ 1,934,446 $ 1,940,327 Multifamily and commercial 15,645 — 1,238 16,883 1,873 2,801,082 2,817,965 Construction 550 — — 550 — 328,161 328,711 Commercial business loans 2,343 1,056 2,453 5,852 2,968 747,018 752,870 Consumer loans: Home equity loans and advances 1,156 696 394 2,246 678 318,931 321,177 Other consumer loans 4 — — 4 — 1,493 1,497 Total loans $ 22,766 $ 2,664 $ 5,986 $ 31,416 $ 8,156 $ 6,131,131 $ 6,162,547
Schedule of PCI Loans Acquired	The following table presents changes in accretable yield for PCI loans for the three and nine months ended September 30, 2021 and 2020. Three Months Ended Nine Months Ended 2021 2020 2021 2020 (In thousands) Balance at beginning of period $ 375 $ 471 $ 418 $ 511 Acquisition — — — 58 Accretion (27) (58) (91) (156) Net change in expected cash flows 4 1 25 1 Balance at end of period $ 352 $ 414 $ 352 $ 414
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 September 30, 2021 and December 31, 2020: September 30, 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 $ 264 $ 96 $ — $ 14 $ 5 $ — $ 379 Collectively evaluated for impairment 14,524 26,137 9,482 18,711 1,087 6 69,947 Loans acquired with deteriorated credit quality — — — — — — — Total $ 14,788 $ 26,233 $ 9,482 $ 18,725 $ 1,092 $ 6 $ 70,326 Total loans: Individually evaluated for impairment $ 5,471 $ 18,210 $ — $ 2,089 $ 727 $ — $ 26,497 Collectively evaluated for impairment 1,928,405 3,119,251 272,004 447,932 263,384 1,772 6,032,748 Loans acquired with deteriorated credit quality 233 1,779 — 982 — — 2,994 Total loans $ 1,934,109 $ 3,139,240 $ 272,004 $ 451,003 $ 264,111 $ 1,772 $ 6,062,239 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 and nine months ended September 30, 2021 and 2020 are as follows: For the Three Months Ended September 30, 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 $ 17,108 $ 26,256 $ 9,160 $ 15,898 $ 1,471 $ 5 $ 69,898 Provision charged (credited) (2,218) (317) 322 2,854 (165) 4 480 Recoveries 4 294 — 42 7 — 347 Charge-offs (106) — — (69) (221) (3) (399) Balance at end of period $ 14,788 $ 26,233 $ 9,482 $ 18,725 $ 1,092 $ 6 $ 70,326 2020 Balance at beginning of period $ 16,633 $ 27,330 $ 10,217 $ 18,314 $ 1,514 $ 7 $ 74,015 Provision charged (credited) (758) 3,659 317 (573) (129) — 2,516 Recoveries 87 — — 128 32 — 247 Charge-offs (187) — — (367) (91) — (645) Balance at end of period $ 15,775 $ 30,989 $ 10,534 $ 17,502 $ 1,326 $ 7 $ 76,133 For the Nine Months Ended September 30, 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) 1,796 (5,117) (1,790) 2,945 (400) 5 (2,561) Recoveries 18 1,231 1 169 52 — 1,471 Charge-offs (612) (562) — (1,773) (308) (5) (3,260) Balance at end of period $ 14,788 $ 26,233 $ 9,482 $ 18,725 $ 1,092 $ 6 $ 70,326 2020 Balance at beginning of period $ 13,780 $ 22,980 $ 7,435 $ 15,836 $ 1,669 $ 9 $ 61,709 Provision charged (credited) 2,292 7,998 3,098 4,685 (253) — 17,820 Recoveries 329 12 1 211 55 — 608 Charge-offs (626) (1) — (3,230) (145) (2) (4,004) Balance at end of period $ 15,775 $ 30,989 $ 10,534 $ 17,502 $ 1,326 $ 7 $ 76,133
Schedule of troubled debt restructuring	The following tables present the number of loans modified as TDRs during the three and nine months ended September 30, 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. 9. Loans Receivable and Allowance for Loan Losses (continued) For the Three Months Ended September 30, 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: One-to-four family 1 $ 64 $ 66 — $ — $ — Multifamily and commercial — — — 4 16,387 16,387 Commercial business loans — — — 1 1,295 1,295 Total restructured loans 1 $ 64 $ 66 5 $ 17,682 $ 17,682 For the Nine Months Ended September 30, 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: One-to-four family 2 $ 285 $ 388 — $ — $ — Multifamily and commercial 1 192 211 4 16,387 16,387 Commercial business loans — — — 2 11,507 12,802 Total restructured loans 3 $ 477 $ 599 6 $ 27,894 $ 29,189
Schedule of loans individually evaluated for impairment	The following tables present loans individually evaluated for impairment by loan segment, excluding PCI loans, at September 30, 2021 and December 31, 2020: At September 30, 2021 Recorded Investment Unpaid Principal Balance Specific Allowance (In thousands) With no allowance recorded: Real estate loans: One-to-four family $ 2,533 $ 2,533 $ — Multifamily and commercial 16,223 16,223 — Commercial business loans 591 591 — Consumer loans: Home equity loans and advances 521 521 — 19,868 19,868 — With a specific allowance recorded: Real estate loans: One-to-four family 2,938 2,938 264 Multifamily and commercial 1,987 1,987 96 Commercial business loans 1,498 1,497 14 Consumer loans: Home equity loans and advances 206 206 5 6,629 6,628 379 Total: Real estate loans: One-to-four family 5,471 5,471 264 Multifamily and commercial 18,210 18,210 96 Commercial business loans 2,089 2,088 14 Consumer loans: Home equity loans and advances 727 727 5 Total loans $ 26,497 $ 26,496 $ 379 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 For the Three Months Ended September 30, 2021 2020 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (In thousands) Real estate loans: One-to-four family $ 5,569 $ 64 $ 8,020 $ 74 Multifamily and commercial 26,103 227 23,525 227 Commercial business loans 2,106 36 4,979 52 Consumer loans: Home equity loans and advances 1,101 11 1,935 28 Total loans $ 34,879 $ 338 $ 38,459 $ 381 For the Nine Months Ended September 30, 2021 2020 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized (In thousands) Real estate loans: One-to-four family $ 5,923 $ 229 $ 8,175 $ 226 Multifamily and commercial 28,246 688 20,670 653 Commercial business loans 2,226 106 5,468 196 Consumer loans: Home equity loans and advances 1,257 32 1,995 85 Total loans $ 37,652 $ 1,055 $ 36,308 $ 1,160
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 September 30, 2021 and December 31, 2020: September 30, 2021 One-to-Four Family Multifamily and Commercial Construction Commercial Business Home Equity Loans and Advances Other Consumer Loans Total (In thousands) Pass $ 1,927,870 $ 3,052,850 $ 271,897 $ 427,793 $ 263,650 $ 1,772 $ 5,945,832 Special mention 388 52,562 107 9,787 — — 62,844 Substandard 5,618 32,049 — 12,441 461 — 50,569 Doubtful — — — — — — — Loss — — — — — — — Total $ 1,933,876 $ 3,137,461 $ 272,004 $ 450,021 $ 264,111 $ 1,772 $ 6,059,245 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)	9 Months Ended
	Sep. 30, 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 September 30, 2021 Lease Payment Obligations (In thousands) One year or less $ 1,026 After one year to two years 4,008 After two years to three years 3,739 After three years to four years 3,014 After four years to five years 2,342 Thereafter 6,662 Total undiscounted cash flows 20,791 Discount on cash flows (1,663) Total lease liability $ 19,128

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2021
Deposits [Abstract]
Schedule of Deposits	Deposits at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, December 31, 2021 2020 (In thousands) Non-interest-bearing demand $ 1,567,112 $ 1,354,605 Interest-bearing demand 2,451,718 2,189,164 Money market accounts 636,392 588,180 Savings and club deposits 775,681 688,309 Certificates of deposit 1,791,455 1,958,366 Total deposits $ 7,222,358 $ 6,778,624
Schedule of Certificate Accounts by Maturity	Scheduled maturities of certificates of deposit accounts at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, December 31, 2021 2020 (In thousands) One year or less $ 1,193,342 $ 1,494,129 After one year to two years 365,668 337,579 After two years to three years 120,496 52,809 After three years to four years 29,925 23,018 After four years 82,024 50,831 $ 1,791,455 $ 1,958,366

Stock Based Compensation (Table

Stock Based Compensation (Tables)	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 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 Forfeited (128) 15.60 Non-vested at June 30, 2021 1,299,398 $ 15.74 Vested (163,882) 15.61 Forfeited (29,882) 15.63 Non-vested at September 30, 2021 1,105,634 $ 15.76 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 Forfeited (240) 15.60 Non-vested at June 30, 2020 1,418,891 $ 15.67 Vested (167,427) 15.62 Forfeited (15,390) 16.07 Non-vested at September 30, 2020 1,236,074 $ 15.68
Share-based Payment Arrangement, Option, Activity	The following is a summary of the Company's option activity during the three and nine months ended September 30, 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 Exercised (1,661) 15.60 — — Expired (7,529) 15.60 — — Forfeited (1,412) 15.60 — — Outstanding, June 30, 2021 3,775,533 $ 15.73 8.1 $ 5,700,258 Exercised (26,861) 15.60 — — Expired (353) 15.60 — — Forfeited (58,287) 15.73 — — Outstanding, September 30, 2021 3,690,032 $ 15.73 7.9 $ 10,222,527 Options exercisable at September 30, 2021 1,411,976 $ 15.64 7.8 $ 4,036,196 12. Stock Based Compensation (continued) 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 $ — Forfeited (2,647) 15.60 — — Outstanding, June 30, 2020 3,771,690 $ 15.67 9.1 $ — Forfeited (44,485) 15.95 — — Outstanding, September 30, 2020 3,727,205 $ 15.67 8.8 $ — Options exercisable at September 30, 2020 727,438 $ 15.62 8.7 $ —

Components of Net Periodic Be_2

Components of Net Periodic Benefit Costs (Tables)	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2021 and 2020, includes the following components: For the Three Months Ended September 30, 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 $ 1,872 $ 2,032 $ 100 $ 67 $ 130 $ 99 $ 141 $ 120 Compensation and employee benefits Interest cost 1,902 1,824 86 102 141 171 125 135 Other non-interest expense Expected return on plan assets (6,661) (5,908) — — — — — — Other non-interest expense Amortization: Prior service cost — — — — — — 14 14 Other non-interest expense Net loss — 1,492 166 99 153 77 191 113 Other non-interest expense Net periodic (income) benefit cost $ (2,887) $ (560) $ 352 $ 268 $ 424 $ 347 $ 471 $ 382 For the Nine Months Ended September 30, 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 $ 6,172 $ 5,906 $ 300 $ 201 $ 390 $ 297 $ 423 $ 346 Compensation and employee benefits Interest cost 5,414 5,887 258 306 423 513 375 384 Other non-interest expense Expected return on plan assets (19,297) (17,383) — — — — — — Other non-interest expense Amortization: Prior service cost — — — — — — 42 42 Other non-interest expense Net loss 2,000 3,054 498 297 459 231 573 339 Other non-interest expense Net periodic (income) benefit cost $ (5,711) $ (2,536) $ 1,056 $ 804 $ 1,272 $ 1,041 $ 1,413 $ 1,111

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2021 and December 31, 2020, by level within the fair value hierarchy: September 30, 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 $ 39,303 $ 35,194 $ 4,109 $ — Mortgage-backed securities and collateralized mortgage obligations 1,650,612 — 1,650,612 — Municipal obligations 10,210 — 10,210 — Corporate debt securities 64,741 — 64,741 — Trust preferred securities — — — — Total debt securities available for sale 1,764,866 35,194 1,729,672 — Equity securities 2,785 2,439 346 — Derivative assets 11,464 — 11,464 — $ 1,779,115 $ 37,633 $ 1,741,482 $ — Derivative liabilities $ 25,068 $ — $ 25,068 $ — 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 September 30, 2021 and December 31, 2020, by level within the fair value hierarchy: September 30, 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 $ 1,213 $ — $ — $ 1,213 Mortgage servicing rights 2,057 — — 2,057 $ 3,270 $ — $ — $ 3,270 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 September 30, 2021 and December 31, 2020: September 30, 2021 Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Weighted Average (Dollars in thousands) Impaired loans $ 1,213 Other Contracted sale price of collateral — % — % Mortgage servicing rights 2,057 Discounted cash flow Prepayment speeds and discount rates (1) 7.5% - 25.0% 12.3 % 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 (1) 9.7% - 26.2% 16.7 % (1) 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 September 30, 2021 and December 31, 2020: September 30, 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 $ 298,488 $ 298,488 $ 298,488 $ — $ — Debt securities available for sale 1,764,866 1,764,866 35,194 1,729,672 — Debt securities held to maturity 408,088 417,268 — 417,268 — Equity securities 2,785 2,785 2,439 346 — Federal Home Loan Bank stock 40,891 40,891 — 40,891 — Loans receivable, net 6,013,968 6,230,842 — — 6,230,842 Derivative assets 11,464 11,464 — 11,464 — Financial liabilities: Deposits $ 7,222,358 $ 7,224,770 $ — $ 7,224,770 $ — Borrowings 749,631 753,800 — 753,800 — Derivative liabilities 25,068 25,068 — 25,068 — 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)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Schedule of Other Comprehensive Income (Loss)	The following tables present the components of other comprehensive income (loss), both gross and net of tax, for the three and nine months ended September 30, 2021 and 2020: For the Three Months Ended September 30, 2021 2020 Before Tax Tax Effect After Tax Before Tax Tax Effect After Tax (In thousands) Components of other comprehensive income (loss): Unrealized (loss) on debt securities available for sale: $ (13,609) $ 3,666 $ (9,943) $ (3,688) $ 775 $ (2,913) Accretion of unrealized (loss) on debt securities reclassified as held to maturity (3) 1 (2) (4) — (4) Reclassification adjustment for gain included in net income 2,296 (505) 1,791 — — — (11,316) 3,162 (8,154) (3,692) 775 (2,917) Derivatives: Unrealized gain on swap contracts accounted for as cash flow hedges 2,035 (568) 1,467 2,256 (471) 1,785 2,035 (568) 1,467 2,256 (471) 1,785 Employee benefit plans: Amortization of prior service cost included in net income (14) 4 (10) (14) 3 (11) Reclassification adjustment of actuarial net (loss) included in net income (1,511) 422 (1,089) (1,071) 225 (846) Change in funded status of retirement obligations 3,050 (852) 2,198 (41,434) 8,701 (32,733) 1,525 (426) 1,099 (42,519) 8,929 (33,590) Total other comprehensive income (loss) $ (7,756) $ 2,168 $ (5,588) $ (43,955) $ 9,233 $ (34,722) 15. Other Comprehensive Income (Loss) (continued) For the Nine Months Ended September 30, 2021 2020 Before Tax Tax Effect After Tax Before Tax Tax Effect After Tax (In thousands) Components of other comprehensive income (loss): Unrealized (loss) gain on debt securities available for sale: $ (26,804) $ 4,615 $ (22,189) $ 28,736 $ (6,031) $ 22,705 Accretion of unrealized (loss) gain on debt securities reclassified as held to maturity (24) 24 — 1 — 1 Reclassification adjustment for (loss) gain included in net income 2,015 (426) 1,589 370 (81) 289 (24,813) 4,213 (20,600) 29,107 (6,112) 22,995 Derivatives: Unrealized gain (loss) on swap contracts accounted for as cash flow hedges 9,182 (1,084) 8,098 (13,050) 2,736 (10,314) 9,182 (1,084) 8,098 (13,050) 2,736 (10,314) Employee benefit plans: Amortization of prior service cost included in net income (42) 11 (31) (42) 10 (32) Reclassification adjustment of actuarial net (loss) included in net income (4,533) 1,266 (3,267) (3,213) 674 (2,539) Change in funded status of retirement obligations 40,541 (3,971) 36,570 (37,093) 7,789 (29,304) 35,966 (2,694) 33,272 (40,348) 8,473 (31,875) Total other comprehensive income (loss) $ 20,335 $ 435 $ 20,770 $ (24,291) $ 5,097 $ (19,194)
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 and nine months ended September 30, 2021 and 2020: For the Three Months Ended September 30, 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 $ 18,582 $ (10,225) $ (51,624) $ (43,267) $ 35,225 $ (20,573) $ (67,859) $ (53,207) Current period changes in other comprehensive income (loss) (8,154) 1,467 1,099 (5,588) (2,917) 1,785 (33,590) (34,722) Total other comprehensive income (loss) $ 10,428 $ (8,758) $ (50,525) $ (48,855) $ 32,308 $ (18,788) $ (101,449) $ (87,929) For the Nine Months Ended September 30, 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) $ 9,313 $ (8,474) $ (69,574) $ (68,735) Current period changes in other comprehensive income (loss) (20,600) 8,098 33,272 20,770 22,995 (10,314) (31,875) (19,194) Total other comprehensive income (loss) $ 10,428 $ (8,758) $ (50,525) $ (48,855) $ 32,308 $ (18,788) $ (101,449) $ (87,929)
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 and nine months ended September 30, 2021 and 2020: Accumulated Other Comprehensive Income (Loss) Components For the Three Months Ended September 30, Affected Line Items in the Consolidated Statements of Income 2021 2020 (In thousands) Reclassification adjustment for gain included in net income $ 2,296 $ — Gain on securities transactions Reclassification adjustment of actuarial net (loss) included in net income (1,511) (1,071) Other non-interest expense Total before tax 785 (1,071) Income (tax) benefit (83) 225 Net of tax $ 702 $ (846) Accumulated Other Comprehensive Income (Loss) Components For the Nine Months Ended September 30, Affected Line Items in the Consolidated Statements of Income 2021 2020 (In thousands) Reclassification adjustment for gain included in net income $ 2,015 $ 370 Gain on securities transactions Reclassification adjustment of actuarial net (loss) included in net income (4,533) (3,213) Other non-interest expense Total before tax (2,518) (2,843) Income (tax) benefit 840 593 Net of tax $ (1,678) $ (2,250)

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2021 and December 31, 2020: September 30, 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 $ 11,464 Other Liabilities $ 25,068 Total derivative instruments $ 11,464 $ 25,068 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)	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2021 and 2020. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Non-interest income In-scope of Topic 606: Demand deposit account fees $ 986 $ 787 $ 2,682 $ 2,706 Title insurance fees 1,431 1,218 4,554 3,445 Other non-interest income 1,934 1,749 5,633 4,688 Total in-scope non-interest income 4,351 3,754 12,869 10,839 Total out-of-scope non-interest income 4,523 4,155 18,991 10,469 Total non-interest income $ 8,874 $ 7,909 $ 31,860 $ 21,308

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details)	Apr. 01, 2020USD ($)shares	Nov. 01, 2019USD ($)branch$ / shares	Sep. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)branch	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)branch
Business Acquisition [Line Items]
Merger-related expenses			$ 55,000			$ 424,000	$ 130,000	$ 1,931,000
Branch closures
Business Acquisition [Line Items]
Number of branches closed | branch						4		4
Gain (loss) on branch closures			14,000				(301,000)	$ (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						$ 248,000		1,300,000
Roselle Entities
Business Acquisition [Line Items]
Merger-related expenses			0			175,000	0	618,000
Business acquisition, equity interest issued or issuable (in shares) | shares	4,759,048
Goodwill	$ 23,809,000		17,600,000				17,600,000
Business combination, provisional information, initial accounting incomplete, adjustment, deferred tax assets				$ 1,100,000	$ 5,100,000
Freehold
Business Acquisition [Line Items]
Merger-related expenses			$ 55,000			$ 0	$ 130,000	$ 0

Acquisitions - Assets Acquired

Acquisitions - Assets Acquired and Liabilities Assumed in Roselle Acquisition (Details) - Roselle Entities - USD ($) $ in Thousands	Apr. 01, 2020	Sep. 30, 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 recorded at merger	$ 23,809	$ 17,600

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 20,982	$ 15,087	$ 68,715	$ 36,949
Shares:
Weighted average shares outstanding - basic (in shares)	102,977,254	110,983,871	104,486,520	110,177,736
Effect of dilutive common stock equivalents (in shares)	0	0	0	0
Weighted average shares outstanding - diluted (in shares)	102,977,254	110,983,871	104,486,520	110,177,736
Earnings per share:
Earnings per share - basic (in dollars per share)	$ 0.20	$ 0.14	$ 0.66	$ 0.34
Earnings per share - diluted (in dollars per share)	$ 0.20	$ 0.14	$ 0.66	$ 0.34
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	3,731,901	3,771,082	3,741,138	3,769,793

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	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 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)					1,163,500	624,932	4,633,540	4,081,132
Shares repurchased, value					$ 20,544	$ 6,925	$ 79,090	$ 60,286
Shares repurchased, price per share (in dollars per share)					$ 17.66	$ 11.08	$ 17.07	$ 14.78

Summary of Significant Accoun_3

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

Debt Securities Available for_3

Debt Securities Available for Sale - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,750,214	$ 1,277,511
Gross Unrealized Gains	24,073	40,748
Gross Unrealized (Losses)	(9,421)	(1,307)
Fair Value	1,764,866	1,316,952
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	38,651	24,425
Gross Unrealized Gains	749	1,124
Gross Unrealized (Losses)	(97)	0
Fair Value	39,303	25,549
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,638,630	1,163,613
Gross Unrealized Gains	21,077	37,343
Gross Unrealized (Losses)	(9,095)	(562)
Fair Value	1,650,612	1,200,394
Municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,190	16,845
Gross Unrealized Gains	20	17
Gross Unrealized (Losses)	0	0
Fair Value	10,210	16,862
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	62,743	67,628
Gross Unrealized Gains	2,227	2,264
Gross Unrealized (Losses)	(229)	(415)
Fair Value	$ 64,741	69,477
Trust preferred securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		5,000
Gross Unrealized Gains		0
Gross Unrealized (Losses)		(330)
Fair Value		$ 4,670

Debt Securities Available for_4

Debt Securities Available for Sale - Expected Maturities of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
One year or less	$ 6,944
More than one year to five years	68,415
More than five years to ten years	36,225
Available-for-sale debt securities, allocated and single maturity date, total	111,584
Mortgage-backed securities and collateralized mortgage obligations	1,638,630
Amortized Cost	1,750,214	$ 1,277,511
Fair Value
One year or less	6,944
More than one year to five years	70,837
More than five years to ten years	36,473
Available-for-sale debt securities, allocated and single maturity date, total	114,254
Mortgage-backed securities and collateralized mortgage obligations	1,650,612
Debt securities available for sale, at fair value	$ 1,764,866	$ 1,316,952

Debt Securities Available for_5

Debt Securities Available for Sale - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)security
Investments, Debt and Equity Securities [Abstract]
Mortgage-backed securities and collateralized mortgage obligations	$ 1,638,630,000		$ 1,638,630,000
Mortgage-backed securities and collateralized mortgage obligations	1,650,612,000		1,650,612,000
Proceeds from sales of debt securities available for sale	22,500,000	$ 0	27,249,000	$ 20,761,000
Gross gains on sale of available-for-sale securities	2,000,000		2,000,000	369,000
Gross losses on sale of available-for-sale securities	0		281,000
Sale and maturity of debt securities, available-for-sale	0		210,000	5,800,000
Proceeds from calls of debt securities available for sale	9,000,000		14,000,000	6,600,000
Gross gains or losses on debt securities available-for-sale	0		0
Calls of debt securities, available-for-sale, realized gain				1,000
Debt securities, available-for-sale, restricted	$ 567,800,000		$ 567,800,000		$ 822,200,000
Number of securities in unrealized loss position | security	83		83		40
Other-than-temporary impairments charge on debt securities available for sale	$ 0	$ 0	$ 0	$ 0

Debt Securities Available for_6

Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 709,665	$ 127,823
Less than 12 months, gross unrealized (losses)	(8,279)	(636)
12 months or longer, fair value	66,083	34,428
12 months or longer, gross unrealized (losses)	(1,142)	(671)
Fair value	775,748	162,251
Gross unrealized (losses)	(9,421)	(1,307)
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	9,804
Less than 12 months, gross unrealized (losses)	(97)
12 months or longer, fair value	0
12 months or longer, gross unrealized (losses)	0
Fair value	9,804
Gross unrealized (losses)	(97)
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	694,865	117,978
Less than 12 months, gross unrealized (losses)	(8,178)	(481)
12 months or longer, fair value	61,308	24,018
12 months or longer, gross unrealized (losses)	(917)	(81)
Fair value	756,173	141,996
Gross unrealized (losses)	(9,095)	(562)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	4,996	9,845
Less than 12 months, gross unrealized (losses)	(4)	(155)
12 months or longer, fair value	4,775	5,740
12 months or longer, gross unrealized (losses)	(225)	(260)
Fair value	9,771	15,585
Gross unrealized (losses)	$ (229)	(415)
Trust preferred securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value		0
Less than 12 months, gross unrealized (losses)		0
12 months or longer, fair value		4,670
12 months or longer, gross unrealized (losses)		(330)
Fair value		4,670
Gross unrealized (losses)		$ (330)

Debt Securities Held to Matur_3

Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 408,088	$ 262,720
Gross unrealized gains	10,088	14,373
Gross unrealized (losses)	(908)	(2)
Fair value	417,268	277,091
U.S. government and agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	44,870	5,000
Gross unrealized gains	0	1
Gross unrealized (losses)	(489)	0
Fair value	44,381	5,001
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	363,218	257,720
Gross unrealized gains	10,088	14,372
Gross unrealized (losses)	(419)	(2)
Fair value	$ 372,887	$ 272,090

Debt Securities Held to Matur_4

Debt Securities Held to Maturity - Expected Maturities of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
More than one year to five years	$ 14,875
More than five years to ten years	19,995
More than ten years	10,000
Held-to-maturity debt securities, allocated and single maturity date, total	44,870
Mortgage-backed securities and collateralized mortgage obligations	363,218
Amortized Cost	408,088	$ 262,720
Fair Value
More than one year to five years	14,857
More than five years to ten years	19,685
More than ten years	9,839
Held-to-maturity debt securities, allocated and single maturity date, total	44,381
Mortgage-backed securities and collateralized mortgage obligations	372,887
Debt securities held to maturity	$ 417,268	$ 277,091

Debt Securities Held to Matur_5

Debt Securities Held to Maturity - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)security
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	$ 408,088,000		$ 408,088,000		$ 262,720,000
Fair value	417,268,000		417,268,000		277,091,000
Proceeds from sale of held-to-maturity securities	0	$ 0	0	$ 0
Proceeds from sale and maturity of held-to-maturity securities		20,000,000	5,100,000	20,000,000
Debt securities, held-to-maturity, sold, realized gain (loss)		0	0	0
Fair value of securities sold under agreements to repurchase	$ 256,900,000		$ 256,900,000		$ 220,500,000
Number of positions | security	10		10		2
Other-than-temporary impairment loss, held-to-maturity, before tax	$ 0	$ 0	$ 0	$ 0
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	363,218,000		363,218,000		$ 257,720,000
Fair value	$ 372,887,000		$ 372,887,000		$ 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	Sep. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	$ 63,185
Less than 12 months, Gross unrealized (losses)	(908)
12 months or longer, Fair value	0
12 months or longer, Gross unrealized (losses)	0
Total, Fair value	63,185
Total, Gross unrealized (losses)	(908)
U.S. government and agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	44,381
Less than 12 months, Gross unrealized (losses)	(489)
12 months or longer, Fair value	0
12 months or longer, Gross unrealized (losses)	0
Total, Fair value	44,381
Total, Gross unrealized (losses)	(489)
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	18,804	$ 2,176
Less than 12 months, Gross unrealized (losses)	(419)	(2)
12 months or longer, Fair value	0	0
12 months or longer, Gross unrealized (losses)	0	0
Total, Fair value	18,804	2,176
Total, Gross unrealized (losses)	$ (419)	$ (2)

Equity Securities at Fair Val_2

Equity Securities at Fair Value (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 2,785,000		$ 2,785,000		$ 5,418,000
Change in fair value of equity securities	(443,000)	$ (4,000)	(1,809,000)	$ 55,000
Proceeds from sale of equity securities	1,300,000	$ 0	1,300,000	$ 0
Equity securities, realized gain	344,000		344,000
Equity securities, realized loss	$ 0		$ 0

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Loan Losses - Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 6,062,239	$ 6,168,892
Net deferred loan costs, fees and purchased premiums and discounts	22,055	12,878
Loans receivable	6,084,294	6,181,770
Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,934,109	1,940,636
Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	3,139,240	2,822,858
Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	272,004	328,711
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	451,003	754,013
Consumer loans | Home equity loans and advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	264,111	321,177
Consumer loans | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,772	1,497
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	6,059,245	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	1,933,876	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	3,137,461	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	272,004	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	450,021	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	264,111	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	1,772	1,497
Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	2,994	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	233	309
Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,779	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	982	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		9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Dec. 31, 2020USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale	$ 0		$ 0		$ 4,100,000
Proceeds from sales of loans held-for-sale			293,005,000	$ 111,764,000
Gain on sale of loans held-for-sale	140,000		8,600,000
Loss on sale of loans held-for-sale	0		0
Proceeds from sales of loans receivable	0		0	28,923,000
Purchases of loans receivable		$ 0	74,232,000	$ 0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	6,084,294,000		6,084,294,000		6,181,770,000
Carrying value of servicing liability	551,100,000		$ 551,100,000		$ 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	5,300,000		$ 5,300,000		$ 8,200,000
Financing receivable, 90 days or more past due, still accruing	0		0		0
Real estate owned	$ 0		$ 0		$ 0
Mortgage loans in process of foreclosure, number of loans | loan	1		1		2
Mortgage loans in process of foreclosure, amount	$ 86,000		$ 86,000		$ 398,000
Specific allowance for loan losses attributable to impaired loans	379,000		379,000		1,088,000
Impaired loans for which there are no related allowance for loan losses	19,868,000		19,868,000		19,061,000
Financing receivable, modifications, recorded investment	$ 23,500,000		$ 23,500,000		45,400,000
Number of loans | loan	1	5	3	6
Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans receivable		$ 274,000
Gain on sale of loans held-for-investment		23,000
Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale	$ 1,800,000	7,800,000	$ 17,400,000	$ 111,800,000
Gain on sale of loans held-for-sale		327,000		1,700,000
Loss on sale of loans held-for-sale		$ 0		0
Proceeds from sale of loans held-for-investment				8,800,000
Gain on sale of loans held-for-investment				82,000
Loss on sale of loans held-for-investment				$ 0
Purchases of loans receivable	678,000		678,000
Specific allowance for loan losses attributable to impaired loans	264,000		264,000		391,000
Impaired loans for which there are no related allowance for loan losses	$ 2,533,000		$ 2,533,000		3,344,000
Number of loans | loan	1	0	2	0
Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale	$ 15,000,000		$ 19,100,000
Purchases of loans receivable	2,000,000		73,600,000
Specific allowance for loan losses attributable to impaired loans	96,000		96,000		601,000
Impaired loans for which there are no related allowance for loan losses	$ 16,223,000		$ 16,223,000		13,058,000
Number of loans | loan	0	4	1	4
Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale			$ 6,400,000
Proceeds from sale of loans held-for-investment		$ 5,800,000		$ 12,500,000
Gain on sale of loans held-for-investment		$ 0		0
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale	$ 1,200,000		250,100,000
Proceeds from sale of loans held-for-investment				7,600,000
Gain on sale of loans held-for-investment				78,000
Loss on sale of loans held-for-investment				$ 0
Specific allowance for loan losses attributable to impaired loans	14,000		14,000		84,000
Impaired loans for which there are no related allowance for loan losses	$ 591,000		$ 591,000		1,945,000
Number of loans | loan	0	1	0	2
Less Than 90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	$ 1,300,000		$ 1,300,000		$ 2,200,000
Financial receivable, number of loans in nonaccrual status | loan			13		19
60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, recorded investment	400,000		$ 400,000
Number of loans | loan			1
90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, recorded investment					$ 91,000
Number of loans | loan					1
30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, recorded investment	45,000		$ 45,000		$ 11,900,000
Number of loans | loan					3
Freddie Mac
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans receivable	0		99,600,000
Gain on sale of loans receivable		$ 1,500,000	2,300,000	$ 1,500,000
Loss on sale of loans receivable		0	0	0
Proceeds from securitizations of loans held-for-investment		$ 48,500,000		$ 48,500,000
Stewardship Financial Corporation | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,800,000		2,800,000		$ 6,100,000
Roselle Entities | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	184,000		184,000		246,000
Paycheck Protection Program | Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	69,200,000		69,200,000		344,400,000
Financing receivable, unamortized loan fee	$ 1,900,000		$ 1,900,000		$ 6,600,000

Loans Receivable and Allowanc_5

Loans Receivable and Allowance for Loan Losses - Aging of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Non-accrual	$ 5,300	$ 8,200
Total gross loans	6,062,239	6,168,892
Real estate loans | One-to-four family
Financing Receivable, Past Due [Line Items]
Total gross loans	1,934,109	1,940,636
Real estate loans | Multifamily and commercial
Financing Receivable, Past Due [Line Items]
Total gross loans	3,139,240	2,822,858
Real estate loans | Construction
Financing Receivable, Past Due [Line Items]
Total gross loans	272,004	328,711
Commercial business loans
Financing Receivable, Past Due [Line Items]
Total gross loans	451,003	754,013
Consumer loans | Home equity loans and advances
Financing Receivable, Past Due [Line Items]
Total gross loans	264,111	321,177
Consumer loans | Other consumer loans
Financing Receivable, Past Due [Line Items]
Total gross loans	1,772	1,497
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Past Due [Line Items]
Non-accrual	5,266	8,156
Total gross loans	6,059,245	6,162,547
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	9,854	31,416
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total gross loans	2,266	22,766
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 60-89 Days
Financing Receivable, Past Due [Line Items]
Total gross loans	3,635	2,664
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 90 Days or More
Financing Receivable, Past Due [Line Items]
Total gross loans	3,953	5,986
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	6,049,391	6,131,131
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family
Financing Receivable, Past Due [Line Items]
Non-accrual	1,991	2,637
Total gross loans	1,933,876	1,940,327
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	3,612	5,881
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 gross loans	1,274	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 gross loans	1,370	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 gross loans	968	1,901
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	1,930,264	1,934,446
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Financing Receivable, Past Due [Line Items]
Non-accrual	2,433	1,873
Total gross loans	3,137,461	2,817,965
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	4,659	16,883
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 gross loans	486	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 gross loans	1,740	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 gross loans	2,433	1,238
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	3,132,802	2,801,082
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Total gross loans	272,004	328,711
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	107	550
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total gross loans	107	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 gross loans	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 gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	271,897	328,161
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans
Financing Receivable, Past Due [Line Items]
Non-accrual	523	2,968
Total gross loans	450,021	752,870
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	1,118	5,852
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | 30-59 Days
Financing Receivable, Past Due [Line Items]
Total gross loans	225	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 gross loans	400	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 gross loans	493	2,453
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	448,903	747,018
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances
Financing Receivable, Past Due [Line Items]
Non-accrual	319	678
Total gross loans	264,111	321,177
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	358	2,246
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 gross loans	174	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 gross loans	125	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 gross loans	59	394
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	263,753	318,931
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Total gross loans	1,772	1,497
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	0	4
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 gross loans	0	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 gross loans	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 gross loans	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total gross loans	$ 1,772	$ 1,493

Loans Receivable and Allowanc_6

Loans Receivable and Allowance for Loan Losses - Accretable Yield For PCI Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 375	$ 471	$ 418	$ 511
Acquisition	0	0	0	58
Accretion	(27)	(58)	(91)	(156)
Net change in expected cash flows	4	1	25	1
Balance at end of period	$ 352	$ 414	$ 352	$ 414

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Allowance for loan losses:
Total	$ 70,326	$ 69,898	$ 74,676	$ 76,133	$ 74,015	$ 61,709
Total loans:
Total	6,062,239		6,168,892
Real estate loans | One-to-four family
Allowance for loan losses:
Total	14,788	17,108	13,586	15,775	16,633	13,780
Total loans:
Total	1,934,109		1,940,636
Real estate loans | Multifamily and commercial
Allowance for loan losses:
Total	26,233	26,256	30,681	30,989	27,330	22,980
Total loans:
Total	3,139,240		2,822,858
Real estate loans | Construction
Allowance for loan losses:
Total	9,482	9,160	11,271	10,534	10,217	7,435
Total loans:
Total	272,004		328,711
Commercial business loans
Allowance for loan losses:
Total	18,725	15,898	17,384	17,502	18,314	15,836
Total loans:
Total	451,003		754,013
Consumer loans | Home equity loans and advances
Allowance for loan losses:
Total	1,092	1,471	1,748	1,326	1,514	1,669
Total loans:
Total	264,111		321,177
Consumer loans | Other consumer loans
Allowance for loan losses:
Total	6	$ 5	6	$ 7	$ 7	$ 9
Total loans:
Total	1,772		1,497
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Allowance for loan losses:
Individually evaluated for impairment	379		1,088
Collectively evaluated for impairment	69,947		73,588
Total loans:
Individually evaluated for impairment	26,497		45,147
Collectively evaluated for impairment	6,032,748		6,117,400
Total	6,059,245		6,162,547
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | One-to-four family
Allowance for loan losses:
Individually evaluated for impairment	264		391
Collectively evaluated for impairment	14,524		13,195
Total loans:
Individually evaluated for impairment	5,471		7,257
Collectively evaluated for impairment	1,928,405		1,933,070
Total	1,933,876		1,940,327
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Allowance for loan losses:
Individually evaluated for impairment	96		601
Collectively evaluated for impairment	26,137		30,080
Total loans:
Individually evaluated for impairment	18,210		32,792
Collectively evaluated for impairment	3,119,251		2,785,173
Total	3,137,461		2,817,965
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans | Construction
Allowance for loan losses:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	9,482		11,271
Total loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	272,004		328,711
Total	272,004		328,711
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business loans
Allowance for loan losses:
Individually evaluated for impairment	14		84
Collectively evaluated for impairment	18,711		17,300
Total loans:
Individually evaluated for impairment	2,089		3,447
Collectively evaluated for impairment	447,932		749,423
Total	450,021		752,870
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans and advances
Allowance for loan losses:
Individually evaluated for impairment	5		12
Collectively evaluated for impairment	1,087		1,736
Total loans:
Individually evaluated for impairment	727		1,651
Collectively evaluated for impairment	263,384		319,526
Total	264,111		321,177
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer loans
Allowance for loan losses:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	6		6
Total loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,772		1,497
Total	1,772		1,497
Financial Asset Acquired with Credit Deterioration
Allowance for loan losses:
Total	0		0
Total loans:
Total	2,994		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	233		309
Financial Asset Acquired with Credit Deterioration | Real estate loans | Multifamily and commercial
Allowance for loan losses:
Total	0		0
Total loans:
Total	1,779		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	982		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		9 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
No. of Loans | loan	1	5	3	6
Pre-modification Recorded Investment	$ 64	$ 17,682	$ 477	$ 27,894
Post-modification Recorded Investment	$ 66	$ 17,682	$ 599	$ 29,189
Real estate loans | One-to-four family
Financing Receivable, Troubled Debt Restructuring [Line Items]
No. of Loans | loan	1	0	2	0
Pre-modification Recorded Investment	$ 64	$ 0	$ 285	$ 0
Post-modification Recorded Investment	$ 66	$ 0	$ 388	$ 0
Real estate loans | Multifamily and commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
No. of Loans | loan	0	4	1	4
Pre-modification Recorded Investment	$ 0	$ 16,387	$ 192	$ 16,387
Post-modification Recorded Investment	$ 0	$ 16,387	$ 211	$ 16,387
Commercial business loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
No. of Loans | loan	0	1	0	2
Pre-modification Recorded Investment	$ 0	$ 1,295	$ 0	$ 11,507
Post-modification Recorded Investment	$ 0	$ 1,295	$ 0	$ 12,802

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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Allowance for loan losses:
Balance at beginning of period	$ 69,898	$ 74,015	$ 74,676	$ 61,709
Provision charged (credited)	480	2,516	(2,561)	17,820
Recoveries	347	247	1,471	608
Charge-offs	(399)	(645)	(3,260)	(4,004)
Balance at end of period	70,326	76,133	70,326	76,133
Real estate loans | One-to-four family
Allowance for loan losses:
Balance at beginning of period	17,108	16,633	13,586	13,780
Provision charged (credited)	(2,218)	(758)	1,796	2,292
Recoveries	4	87	18	329
Charge-offs	(106)	(187)	(612)	(626)
Balance at end of period	14,788	15,775	14,788	15,775
Real estate loans | Multifamily and commercial
Allowance for loan losses:
Balance at beginning of period	26,256	27,330	30,681	22,980
Provision charged (credited)	(317)	3,659	(5,117)	7,998
Recoveries	294	0	1,231	12
Charge-offs	0	0	(562)	(1)
Balance at end of period	26,233	30,989	26,233	30,989
Real estate loans | Construction
Allowance for loan losses:
Balance at beginning of period	9,160	10,217	11,271	7,435
Provision charged (credited)	322	317	(1,790)	3,098
Recoveries	0	0	1	1
Charge-offs	0	0	0	0
Balance at end of period	9,482	10,534	9,482	10,534
Commercial business loans
Allowance for loan losses:
Balance at beginning of period	15,898	18,314	17,384	15,836
Provision charged (credited)	2,854	(573)	2,945	4,685
Recoveries	42	128	169	211
Charge-offs	(69)	(367)	(1,773)	(3,230)
Balance at end of period	18,725	17,502	18,725	17,502
Consumer loans | Home equity loans and advances
Allowance for loan losses:
Balance at beginning of period	1,471	1,514	1,748	1,669
Provision charged (credited)	(165)	(129)	(400)	(253)
Recoveries	7	32	52	55
Charge-offs	(221)	(91)	(308)	(145)
Balance at end of period	1,092	1,326	1,092	1,326
Consumer loans | Other consumer loans
Allowance for loan losses:
Balance at beginning of period	5	7	6	9
Provision charged (credited)	4	0	5	0
Recoveries	0	0	0	0
Charge-offs	(3)	0	(5)	(2)
Balance at end of period	$ 6	$ 7	$ 6	$ 7

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	$ 19,868	$ 19,061
With no allowance recorded: Unpaid principal balance	19,868	19,788
With a specific allowance recorded: Recorded investment	6,629	26,086
With a specific allowance recorded: Unpaid principal balance	6,628	26,708
Recorded Investment	26,497	45,147
Unpaid Principal Balance	26,496	46,496
Specific Allowance	379	1,088
Real estate loans | One-to-four family
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	2,533	3,344
With no allowance recorded: Unpaid principal balance	2,533	3,898
With a specific allowance recorded: Recorded investment	2,938	3,913
With a specific allowance recorded: Unpaid principal balance	2,938	3,919
Recorded Investment	5,471	7,257
Unpaid Principal Balance	5,471	7,817
Specific Allowance	264	391
Real estate loans | Multifamily and commercial
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	16,223	13,058
With no allowance recorded: Unpaid principal balance	16,223	13,094
With a specific allowance recorded: Recorded investment	1,987	19,734
With a specific allowance recorded: Unpaid principal balance	1,987	20,350
Recorded Investment	18,210	32,792
Unpaid Principal Balance	18,210	33,444
Specific Allowance	96	601
Commercial business loans
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	591	1,945
With no allowance recorded: Unpaid principal balance	591	1,945
With a specific allowance recorded: Recorded investment	1,498	1,502
With a specific allowance recorded: Unpaid principal balance	1,497	1,502
Recorded Investment	2,089	3,447
Unpaid Principal Balance	2,088	3,447
Specific Allowance	14	84
Consumer loans | Home equity loans and advances
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	521	714
With no allowance recorded: Unpaid principal balance	521	851
With a specific allowance recorded: Recorded investment	206	937
With a specific allowance recorded: Unpaid principal balance	206	937
Recorded Investment	727	1,651
Unpaid Principal Balance	727	1,788
Specific Allowance	$ 5	$ 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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 34,879	$ 38,459	$ 37,652	$ 36,308
Interest Income Recognized	338	381	1,055	1,160
Real estate loans | One-to-four family
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	5,569	8,020	5,923	8,175
Interest Income Recognized	64	74	229	226
Real estate loans | Multifamily and commercial
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	26,103	23,525	28,246	20,670
Interest Income Recognized	227	227	688	653
Commercial business loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	2,106	4,979	2,226	5,468
Interest Income Recognized	36	52	106	196
Consumer loans | Home equity loans and advances
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,101	1,935	1,257	1,995
Interest Income Recognized	$ 11	$ 28	$ 32	$ 85

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	$ 6,062,239	$ 6,168,892
Real estate loans | One-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	1,934,109	1,940,636
Real estate loans | Multifamily and commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	3,139,240	2,822,858
Real estate loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	272,004	328,711
Commercial business loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	451,003	754,013
Consumer loans | Home equity loans and advances
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	264,111	321,177
Consumer loans | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	1,772	1,497
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	6,059,245	6,162,547
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	5,945,832	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	62,844	47,514
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans	50,569	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	1,933,876	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	1,927,870	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	388	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	5,618	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	3,137,461	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	3,052,850	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	52,562	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	32,049	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	272,004	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	271,897	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	107	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	450,021	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	427,793	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	9,787	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	12,441	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	264,111	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	263,650	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	461	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	1,772	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	1,772	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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jan. 01, 2020
Lessee, Lease, Description [Line Items]
Total lease liability	$ 19,128		$ 19,128
Operating lease, weighted average remaining lease term	6 years 10 months 24 days		6 years 10 months 24 days		7 years 6 months
Operating lease, weighted average discount rate	2.14%		2.14%		2.26%
Lease, cost	$ 504	$ 603	$ 1,700	$ 1,900
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term	3 years		3 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term	10 years		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	Sep. 30, 2021USD ($)
Leases [Abstract]
One year or less	$ 1,026
After one year to two years	4,008
After two years to three years	3,739
After three years to four years	3,014
After four years to five years	2,342
Thereafter	6,662
Total undiscounted cash flows	20,791
Discount on cash flows	(1,663)
Total lease liability	$ 19,128

Deposits - Schedule of Deposits

Deposits - Schedule of Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deposits [Abstract]
Non-interest-bearing demand	$ 1,567,112	$ 1,354,605
Interest-bearing demand	2,451,718	2,189,164
Money market accounts	636,392	588,180
Savings and club deposits	775,681	688,309
Certificates of deposit	1,791,455	1,958,366
Total deposits	$ 7,222,358	$ 6,778,624

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Interest-bearing demand	$ 2,451,718		$ 2,451,718		$ 2,189,164
Aggregate amount of certificates of deposit exceeding threshold amount	934,900		934,900		1,000,000
Interest expense on deposits	6,673	$ 12,826	23,403	$ 44,569
Stewardship Financial Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Interest-bearing demand	$ 16,200		$ 16,200		$ 26,300

Deposits - Schedule of Deposit

Deposits - Schedule of Deposit Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deposits [Abstract]
One year or less	$ 1,193,342	$ 1,494,129
After one year to two years	365,668	337,579
After two years to three years	120,496	52,809
After three years to four years	29,925	23,018
After four years	82,024	50,831
Total term certificate accounts	$ 1,791,455	$ 1,958,366

Stock Based Compensation - Narr

Stock Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 22, 2021	Dec. 14, 2020	Dec. 16, 2019	Jul. 23, 2019	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 30, 2020	Mar. 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, aggregate intrinsic value					$ 56,186				$ 59,991
Exercises in period (in shares)					26,861	1,661		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			$ 1,400	$ 4,300	$ 4,200
Non-vested restricted shares outstanding (in shares)					1,105,634	1,299,398	1,299,526	1,236,074	1,105,634	1,236,074	1,263,169	1,418,891	1,419,131	1,420,012
Non-vested restricted shares outstanding, amount					$ 9,700				$ 9,700
Period for recognition (in years)									2 years 1 month 6 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					$ 822			$ 808	$ 2,400	$ 2,400
Non-vested restricted shares outstanding (in shares)					2,278,056				2,278,056
Non-vested restricted shares outstanding, amount					$ 9,000				$ 9,000
Period for recognition (in years)									2 years 9 months 18 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. 22, 2021	Dec. 14, 2020	Dec. 16, 2019	Jul. 23, 2019	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Number of Restricted Shares
Beginning balance (in shares)					1,299,398	1,299,526	1,263,169	1,418,891	1,419,131	1,420,012
Granted (in shares)	50,203	33,160	74,673	1,389,570			50,203
Vested (in shares)					(163,882)			(167,427)
Forfeited (in shares)					(29,882)	(128)	(13,846)	(15,390)	(240)	(881)
Ending balance (in shares)					1,105,634	1,299,398	1,299,526	1,236,074	1,418,891	1,419,131
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)					$ 15.74	$ 15.74	$ 15.66	$ 15.67	$ 15.67	$ 15.67
Granted (in dollars per share)	$ 17.86	$ 15.08	$ 17	$ 15.60			17.86
Vested (in dollars per share)					15.61			15.62
Forfeited (in dollars per share)					15.63	15.60	15.60	16.07	15.60	15.60
Ending balance (in dollars per share)					$ 15.76	$ 15.74	$ 15.74	$ 15.68	$ 15.67	$ 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	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Number of Stock Options
Beginning balance (in shares)				3,775,533	3,786,135	3,708,628	3,771,690	3,774,337	3,784,044	3,784,044	3,784,044
Granted (in shares)	109,654	184,378	3,707,901			109,654
Exercises (in shares)				(26,861)	(1,661)		0			0
Expired (in shares)				(353)	(7,529)	(2,029)
Forfeited (in shares)				(58,287)	(1,412)	(30,118)	(44,485)	(2,647)	(9,707)
Ending balance (in shares)				3,690,032	3,775,533	3,786,135	3,727,205	3,771,690	3,774,337	3,727,205	3,708,628	3,784,044
Options exercisable (in shares)				1,411,976			727,438			727,438
Weighted Average Exercise Price
Beginning balance (in dollars per share)				$ 15.73	$ 15.73	$ 15.66	$ 15.67		$ 15.67	$ 15.67	$ 15.67
Granted (in dollars per share)	$ 17.86	$ 17	$ 15.60			17.86
Exercised (in dollars per share)				15.60	15.60
Expired (in dollars per share)				15.60	15.60	15.60
Forfeited (in dollars per share)				15.73	15.60	15.60	15.95	$ 15.60	$ 15.60
Ending balance (in dollars per share)				15.73	$ 15.73	$ 15.73	15.67	$ 15.67		15.67	$ 15.66	$ 15.67
Options exercisable (in dollars per share)				$ 15.64			$ 15.62			$ 15.62
Weighted Average Remaining Contractual Term (in years)
Options outstanding				7 years 10 months 24 days	8 years 1 month 6 days	8 years 4 months 24 days	8 years 9 months 18 days	9 years 1 month 6 days	9 years 3 months 18 days		8 years 7 months 6 days	9 years 7 months 6 days
Options exercisable				7 years 9 months 18 days			8 years 8 months 12 days
Aggregate Intrinsic Value
Options outstanding				$ 10,222,527	$ 5,700,258	$ 6,673,328	$ 0	$ 0		$ 0	$ 0	$ 4,812,490
Options exercisable				$ 4,036,196

Components of Net Periodic Be_3

Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 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	$ 35,000		$ 35,000
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,872	$ 2,032	6,172	$ 5,906
Interest cost	1,902	1,824	5,414	5,887
Expected return on plan assets	(6,661)	(5,908)	(19,297)	(17,383)
Amortization of Prior service cost	0	0	0	0
Amortization of Net loss	0	1,492	2,000	3,054
Net periodic (income) benefit cost	(2,887)	(560)	(5,711)	(2,536)
RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	100	67	300	201
Interest cost	86	102	258	306
Expected return on plan assets	0	0	0	0
Amortization of Prior service cost	0	0	0	0
Amortization of Net loss	166	99	498	297
Net periodic (income) benefit cost	352	268	1,056	804
Post-retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	130	99	390	297
Interest cost	141	171	423	513
Expected return on plan assets	0	0	0	0
Amortization of Prior service cost	0	0	0	0
Amortization of Net loss	153	77	459	231
Net periodic (income) benefit cost	424	347	1,272	1,041
Split-Dollar Life Insurance
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	141	120	423	346
Interest cost	125	135	375	384
Expected return on plan assets	0	0	0	0
Amortization of Prior service cost	14	14	42	42
Amortization of Net loss	191	113	573	339
Net periodic (income) benefit cost	471	382	1,413	1,111
Former Bank President | RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic (income) benefit cost	$ 2	$ 6	$ 4	$ 8

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	$ 1,764,866	$ 1,316,952
Equity securities	2,785	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	39,303	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	1,650,612	1,200,394
Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	10,210	16,862
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale	64,741	69,477
Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities available for sale		4,670
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	35,194	25,549
Equity securities	2,439	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	1,729,672	1,291,403
Equity securities	346	346
Derivative assets	11,464	19,425
Derivative liabilities	25,068	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	1,764,866	1,316,952
Equity securities	2,785	5,418
Derivative assets	11,464	19,425
Assets	1,779,115	1,341,795
Derivative liabilities	25,068	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	39,303	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	1,650,612	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	10,210	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	64,741	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	0	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	35,194	25,549
Equity securities	2,439	5,072
Derivative assets	0	0
Assets	37,633	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	35,194	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	1,729,672	1,291,403
Equity securities	346	346
Derivative assets	11,464	19,425
Assets	1,741,482	1,311,174
Derivative liabilities	25,068	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	4,109	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	1,650,612	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	10,210	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	64,741	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	0	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)	9 Months Ended
	Sep. 30, 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	Sep. 30, 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]
Impaired loans	$ 0	$ 0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	6,230,842	6,394,524
Measured on non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	1,213
Mortgage servicing rights	2,057	1,338
Assets	3,270	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]
Impaired loans	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]
Impaired loans	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]
Impaired loans	1,213
Mortgage servicing rights	2,057	1,338
Assets	$ 3,270	$ 1,338

Fair Value Measurements - Quali

Fair Value Measurements - Qualitative Valuation (Details) $ in Thousands	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Measured on non-recurring basis
Fair Value
Impaired loans	$ 1,213
Mortgage servicing rights	2,057	$ 1,338
Significant Unobservable Inputs (Level 3)
Fair Value
Impaired loans	6,230,842	6,394,524
Significant Unobservable Inputs (Level 3) | Measured on non-recurring basis
Fair Value
Impaired loans	1,213
Mortgage servicing rights	$ 2,057	$ 1,338
Significant Unobservable Inputs (Level 3) | Contracted sale price of collateral | Measured on non-recurring basis | Other
Unobservable Inputs
Impaired loans	0
Significant Unobservable Inputs (Level 3) | Contracted sale price of collateral | Measured on non-recurring basis | Weighted Average | Other
Unobservable Inputs
Impaired loans	0
Significant Unobservable Inputs (Level 3) | Prepayment speeds and discount rates | Measured on non-recurring basis | Minimum | Discounted cash flow
Unobservable Inputs
Mortgage servicing rights	0.075	0.097
Significant Unobservable Inputs (Level 3) | Prepayment speeds and discount rates | Measured on non-recurring basis | Maximum | Discounted cash flow
Unobservable Inputs
Mortgage servicing rights	0.250	0.262
Significant Unobservable Inputs (Level 3) | Prepayment speeds and discount rates | Measured on non-recurring basis | Weighted Average | Discounted cash flow
Unobservable Inputs
Mortgage servicing rights	0.123	0.167
Significant Unobservable Inputs (Level 3) | Discount rate | Measured on non-recurring basis | Weighted Average | Discounted cash flow
Unobservable Inputs
Mortgage servicing rights	0.1025

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value on Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets:
Debt securities available for sale, at fair value	$ 1,764,866	$ 1,316,952
Debt securities held to maturity	417,268	277,091
Equity securities	2,785	5,418
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	298,488	422,957
Debt securities available for sale, at fair value	35,194	25,549
Debt securities held to maturity	0	5,001
Equity securities	2,439	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	1,729,672	1,291,403
Debt securities held to maturity	417,268	272,090
Equity securities	346	346
Federal Home Loan Bank stock	40,891	43,759
Loans receivable, net	0	0
Derivative assets	11,464	19,425
Financial liabilities:
Deposits	7,224,770	6,793,034
Borrowings	753,800	808,853
Derivative liabilities	25,068	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	6,230,842	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	298,488	422,957
Debt securities available for sale, at fair value	1,764,866	1,316,952
Debt securities held to maturity	408,088	262,720
Equity securities	2,785	5,418
Federal Home Loan Bank stock	40,891	43,759
Loans receivable, net	6,013,968	6,107,094
Derivative assets	11,464	19,425
Financial liabilities:
Deposits	7,222,358	6,778,624
Borrowings	749,631	799,364
Derivative liabilities	25,068	42,384
Total Fair Value
Financial assets:
Cash and cash equivalents	298,488	422,957
Debt securities available for sale, at fair value	1,764,866	1,316,952
Debt securities held to maturity	417,268	277,091
Equity securities	2,785	5,418
Federal Home Loan Bank stock	40,891	43,759
Loans receivable, net	6,230,842	6,394,524
Derivative assets	11,464	19,425
Financial liabilities:
Deposits	7,224,770	6,793,034
Borrowings	753,800	808,853
Derivative liabilities	$ 25,068	$ 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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Before Tax
Other comprehensive income (loss)	$ (7,756)	$ (43,955)	$ 20,335	$ (24,291)
Tax Effect
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	2,168	9,233	435	5,097
After Tax
Total other comprehensive (loss) income	(5,588)	(34,722)	20,770	(19,194)
Unrealized Gains on Debt Securities Available for Sale
Before Tax
Other comprehensive income (loss), before reclassifications	(13,609)	(3,688)	(26,804)	28,736
Other comprehensive income (loss)	(11,316)	(3,692)	(24,813)	29,107
Tax Effect
Other comprehensive income (loss), before reclassifications	3,666	775	4,615	(6,031)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	3,162	775	4,213	(6,112)
After Tax
Other comprehensive income (loss), before reclassifications	(9,943)	(2,913)	(22,189)	22,705
Total other comprehensive (loss) income	(8,154)	(2,917)	(20,600)	22,995
AOCI, Accumulated Gain (Loss), Debt Securities Available-for-sale, Accretion of Unrealized Gains (Losses), Parent
Before Tax
Reclassification from AOCI, current period	(3)	(4)	(24)	1
Tax Effect
Reclassification from AOCI, current period	1	0	24	0
After Tax
Reclassification from AOCI, current period	(2)	(4)	0	1
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Other Reclassifications, Parent
Before Tax
Reclassification from AOCI, current period	2,296	0	2,015	370
Tax Effect
Reclassification from AOCI, current period	(505)	0	(426)	(81)
After Tax
Reclassification from AOCI, current period	1,791	0	1,589	289
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Before Tax
Other comprehensive income (loss), before reclassifications	2,035	2,256	9,182	(13,050)
Tax Effect
Other comprehensive income (loss), before reclassifications	(568)	(471)	(1,084)	2,736
After Tax
Other comprehensive income (loss), before reclassifications	1,467	1,785	8,098	(10,314)
Total other comprehensive (loss) income	1,467	1,785	8,098	(10,314)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Before Tax
Reclassification from AOCI, current period	(14)	(14)	(42)	(42)
Tax Effect
Reclassification from AOCI, current period	4	3	11	10
After Tax
Reclassification from AOCI, current period	(10)	(11)	(31)	(32)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Before Tax
Reclassification from AOCI, current period	(1,511)	(1,071)	(4,533)	(3,213)
Tax Effect
Reclassification from AOCI, current period	422	225	1,266	674
After Tax
Reclassification from AOCI, current period	(1,089)	(846)	(3,267)	(2,539)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Before Tax
Other comprehensive income (loss), before reclassifications	3,050	(41,434)	40,541	(37,093)
Other comprehensive income (loss)	1,525	(42,519)	35,966	(40,348)
Tax Effect
Other comprehensive income (loss), before reclassifications	(852)	8,701	(3,971)	7,789
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(426)	8,929	(2,694)	8,473
After Tax
Other comprehensive income (loss), before reclassifications	2,198	(32,733)	36,570	(29,304)
Total other comprehensive (loss) income	$ 1,099	$ (33,590)	$ 33,272	$ (31,875)

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) - Changes in Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,033,046	$ 1,040,988	$ 1,011,287	$ 982,517
Current period changes in other comprehensive income (loss)	(5,588)	(34,722)	20,770	(19,194)
Balance at end of year	1,030,876	1,017,330	1,030,876	1,017,330
Accumulated Other Comprehensive (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(43,267)	(53,207)	(69,625)	(68,735)
Current period changes in other comprehensive income (loss)	(5,588)	(34,722)	20,770	(19,194)
Balance at end of year	(48,855)	(87,929)	(48,855)	(87,929)
Unrealized Gains on Debt Securities Available for Sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	18,582	35,225	31,028	9,313
Current period changes in other comprehensive income (loss)	(8,154)	(2,917)	(20,600)	22,995
Balance at end of year	10,428	32,308	10,428	32,308
Unrealized (Losses) on Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(10,225)	(20,573)	(16,856)	(8,474)
Current period changes in other comprehensive income (loss)	1,467	1,785	8,098	(10,314)
Balance at end of year	(8,758)	(18,788)	(8,758)	(18,788)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(51,624)	(67,859)	(83,797)	(69,574)
Current period changes in other comprehensive income (loss)	1,099	(33,590)	33,272	(31,875)
Balance at end of year	$ (50,525)	$ (101,449)	$ (50,525)	$ (101,449)

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain on securities transactions	$ 2,296	$ 0	$ 2,015	$ 370
Other non-interest expense	1,809	3,862	8,076	9,757
Total before tax	28,694	20,339	94,228	49,056
Income (tax) benefit	(7,712)	(5,252)	(25,513)	(12,107)
Net income	20,982	15,087	68,715	36,949
Accumulated Other Comprehensive Income (Loss) Components
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	785	(1,071)	(2,518)	(2,843)
Income (tax) benefit	(83)	225	840	593
Net income	702	(846)	(1,678)	(2,250)
Accumulated Other Comprehensive Income (Loss) Components | Reclassification adjustment for gain included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain on securities transactions	2,296	0	2,015	370
Accumulated Other Comprehensive Income (Loss) Components | Reclassification adjustment of actuarial net (loss) included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-interest expense	$ (1,511)	$ (1,071)	$ (4,533)	$ (3,213)

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)swap	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)swap	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)swap
Derivative [Line Items]
Accrued interest on derivatives, at fair value	$ 1,000,000		$ 1,000,000		$ 1,000,000
Derivative, net liability position, aggregate fair value	12,600,000		12,600,000
Derivative, collateral, right to reclaim cash	24,100,000		24,100,000
Currency forward contract - non-designated hedge | Not-designated hedge
Derivative [Line Items]
Notional amount of derivative	0		0		0
Interest Rate Swap
Derivative [Line Items]
Derivative loss (gain) on derivative, net	12,000	$ (44,000)	(189,000)	$ 406,000
Interest Rate Swap | Not-designated hedge
Derivative [Line Items]
Notional amount of derivative	$ 180,100,000		$ 180,100,000		$ 180,100,000
Number of commercial banking customers | swap	50		50		50
Interest Rate Swap | Designated as Hedging Instrument | Federal Home Loan Bank Advances
Derivative [Line Items]
Notional amount of derivative	$ 400,000,000		$ 400,000,000		$ 430,000,000
Number of interest rate derivatives held | swap	28		28		31

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Interest rate swaps | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 11,464	$ 19,425
Interest rate swaps | Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	25,068	42,384
Reported Value Measurement
Derivatives, Fair Value [Line Items]
Derivative assets	11,464	19,425
Derivative liabilities	$ 25,068	$ 42,384

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total out-of-scope non-interest income	$ 4,523	$ 4,155	$ 18,991	$ 10,469
Total non-interest income	8,874	7,909	31,860	21,308
Deposit Account, Title Insurance and Other Non-Interest Income
Disaggregation of Revenue [Line Items]
Revenue	4,351	3,754	12,869	10,839
Demand deposit account fees
Disaggregation of Revenue [Line Items]
Revenue	986	787	2,682	2,706
Title insurance fees
Disaggregation of Revenue [Line Items]
Revenue	1,431	1,218	4,554	3,445
Other non-interest income
Disaggregation of Revenue [Line Items]
Revenue	$ 1,934	$ 1,749	$ 5,633	$ 4,688