Northfield Bancorp, Inc. (NFBK) 10-Q 9 Nov 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Oct. 29, 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	001-35791
Entity Registrant Name	Northfield Bancorp, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	80-0882592
Entity Address, Address Line One	581 Main Street,
Entity Address, City or Town	Woodbridge,
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07095
City Area Code	732
Local Phone Number	499-7200
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	NFBK
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		49,619,086
Entity Central Index Key	0001493225
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
ASSETS:
Cash and due from banks	$ 15,899	$ 16,115
Interest-bearing deposits in other financial institutions	157,795	71,429
Total cash and cash equivalents	173,694	87,544
Trading securities	12,761	12,291
Debt securities available-for-sale	1,084,811	1,264,805
Debt securities held-to-maturity, at amortized cost (estimated fair value of $6,083 at September 30, 2021, and $7,574 at December 31, 2020, and no allowance for credit losses at September 30, 2021)	5,811	7,234
Equity securities	5,219	253
Loans held-for-sale	0	19,895
Total Loans held-for-investment, net	3,816,959	3,823,238
Less: allowance for credit losses	(38,862)	(37,607)
Net loans held-for-investment	3,778,097	3,785,631
Accrued interest receivable	13,826	14,690
Bank-owned life insurance	164,490	161,924
Federal Home Loan Bank (“FHLB”) of New York stock, at cost	22,336	28,641
Operating lease right-of-use assets	35,063	36,741
Premises and equipment, net	26,562	28,188
Goodwill	41,012	41,320
Other assets	34,403	25,387
Total assets	5,398,085	5,514,544
LIABILITIES:
Deposits	4,141,380	4,076,551
Securities sold under agreements to repurchase	50,000	75,000
FHLB advances and other borrowings	371,804	516,789
Operating lease liabilities	41,090	42,734
Advance payments by borrowers for taxes and insurance	23,496	19,677
Accrued expenses and other liabilities	31,109	29,812
Total liabilities	4,658,879	4,760,563
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.01 par value: 25,000,000 shares authorized, none issued or outstanding	0	0
Common stock, $0.01 par value: 150,000,000 shares authorized, 64,770,875 shares issued at September 30, 2021 and December 31, 2020, 50,843,651 and 52,209,897 outstanding at September 30, 2021 and December 31, 2020, respectively	648	648
Additional paid-in-capital	589,280	590,506
Unallocated common stock held by employee stock ownership plan	(17,792)	(18,529)
Retained earnings	371,408	338,093
Accumulated other comprehensive income	7,633	13,160
Treasury stock at cost: 15,215,189 and 12,560,978 shares at September 30, 2021 and December 31, 2020, respectively	(211,971)	(169,897)
Total stockholders’ equity	739,206	753,981
Total liabilities and stockholders’ equity	$ 5,398,085	$ 5,514,544

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Debt securities available-for-sale, allowance for credit loss	$ 0
Debt securities held-to-maturity	6,083	$ 7,574
Debt securities held-to-maturity, allowance for credit loss	$ 0
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	25,000,000	25,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	150,000,000	150,000,000
Common stock, shares issued (shares)	64,770,875	64,770,875
Common stock, shares outstanding (shares)	49,555,686	52,209,897
Treasury stock, shares (shares)	15,215,189	12,560,978

Consolidated Statements of Comp

Consolidated Statements of Comprehensive 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	$ 38,539	$ 37,025	$ 119,515	$ 107,705
Mortgage-backed securities	2,738	3,422	8,379	13,348
Other securities	494	541	1,402	2,342
FHLB of New York dividends	318	410	1,024	1,443
Deposits in other financial institutions	57	59	129	262
Total interest income	42,146	41,457	130,449	125,100
Interest expense:
Deposits	1,420	5,643	4,961	22,395
Borrowings	2,309	3,206	8,208	9,934
Total interest expense	3,729	8,849	13,169	32,329
Net interest income	38,417	32,608	117,280	92,771
(Benefit)/provision for credit losses	(148)	165	(6,223)	10,269
Net interest income after (benefit)/provision for credit losses	38,565	32,443	123,503	82,502
Non-interest income:
Fees and service charges for customer services	1,370	1,009	3,894	2,795
Income on bank-owned life insurance	862	894	2,567	2,635
Gains on available-for-sale debt securities, net	370	45	976	105
(Losses)/gains on trading securities, net	(75)	763	1,096	397
Gains on sales of loans	0	0	1,401	665
Other	101	311	246	772
Total non-interest income	2,628	3,022	10,180	7,369
Non-interest expense:
Compensation and employee benefits	10,334	13,306	31,672	31,039
Occupancy	3,425	3,540	10,626	9,618
Furniture and equipment	431	425	1,310	1,107
Data processing	1,538	3,058	4,968	6,130
Professional fees	826	1,216	2,564	3,370
Advertising	576	424	1,725	1,585
Federal Deposit Insurance Corporation insurance	336	360	1,057	576
Other	1,569	1,459	4,547	3,901
Total non-interest expense	19,035	23,788	58,469	57,326
Income before income tax expense	22,158	11,677	75,214	32,545
Income tax expense	6,078	3,095	20,663	8,619
Net income	$ 16,080	$ 8,582	$ 54,551	$ 23,926
Net income per common share:
Basic (usd per share)	$ 0.33	$ 0.17	$ 1.12	$ 0.50
Diluted (usd per share)	$ 0.33	$ 0.17	$ 1.11	$ 0.50
Unrealized (losses) gains on debt securities available-for-sale:
Net unrealized holding (losses) gains	$ (3,550)	$ (328)	$ (6,700)	$ 13,585
Less: reclassification adjustment for net gains included in net income	(370)	(45)	(976)	(105)
Net unrealized (losses) gains	(3,920)	(373)	(7,676)	13,480
Income tax benefit (expense) related to net unrealized holding (losses) gains on debt securities available-for-sale	995	92	1,876	(3,802)
Income tax expense related to reclassification adjustment for gains included in net income	103	13	273	30
Other comprehensive (loss) income, net of tax	(2,822)	(268)	(5,527)	9,708
Comprehensive income	$ 13,258	$ 8,314	$ 49,024	$ 33,634

Consolidated Statements of Chan

Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common StockCumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital	Additional Paid-in CapitalCumulative Effect, Period of Adoption, Adjusted Balance	Unallocated Common Stock Held by the Employee Stock Ownership Plan	Unallocated Common Stock Held by the Employee Stock Ownership PlanCumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Retained EarningsCumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (loss) Net of tax	Accumulated Other Comprehensive Income (loss) Net of taxCumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury StockCumulative Effect, Period of Adoption, Adjusted Balance
Beginning Balance (in shares) at Dec. 31, 2019				49,175,347
Beginning Balance at Dec. 31, 2019	$ 695,853			$ 609		$ 548,486		$ (19,740)		$ 322,581			$ 4,699		$ (160,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,926									23,926
Other comprehensive income (loss), net of tax	9,708												9,708
ESOP shares allocated or committed to be released	1,074					327		747
Stock compensation expense	1,227					1,227
Restricted stock issuance (in shares)				83,744
Restricted stock issuance	0					(1,145)									1,145
Restricted stock forfeitures (in shares)				(1,225)
Restricted stock forfeitures	0					17									(17)
Exercise of stock options, net (in shares)				13,000
Exercise of stock options, net	175					(4)									179
Cash dividends declared and paid										(15,905)
Repurchase of treasury stock (in shares)				(8,714)
Repurchase of treasury stock	(107)														(107)
Issuance of stock VSB Bancorp, Inc. acquisition (in shares)				3,862,746
Issuance of stock for VSB Bancorp, Inc. acquisition	41,447			$ 39		41,408
Ending Balance (in shares) at Sep. 30, 2020				53,124,898
Ending Balance at Sep. 30, 2020	757,398			$ 648		590,316		(18,993)		330,602			14,407		(159,582)
Beginning Balance (in shares) at Dec. 31, 2019				49,175,347
Beginning Balance at Dec. 31, 2019	$ 695,853			$ 609		548,486		(19,740)		322,581			4,699		(160,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Ending Balance (in shares) at Dec. 31, 2020				52,209,897	52,209,897
Ending Balance at Dec. 31, 2020	$ 753,981	$ (3,087)	$ 750,894	$ 648	$ 648	590,506	$ 590,506	(18,529)	$ (18,529)	338,093	$ (3,087)	$ 335,006	13,160	$ 13,160	(169,897)	$ (169,897)
Beginning Balance (in shares) at Jun. 30, 2020				49,263,377
Beginning Balance at Jun. 30, 2020	712,576			$ 609		548,495		(19,244)		327,606			14,675		(159,565)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,582									8,582
Other comprehensive income (loss), net of tax	(268)												(268)
ESOP shares allocated or committed to be released	301					50		251
Stock compensation expense	346					346
Restricted stock forfeitures (in shares)				(1,225)
Restricted stock forfeitures	0					17									(17)
Cash dividends declared and paid	(5,586)									(5,586)
Issuance of stock VSB Bancorp, Inc. acquisition (in shares)				3,862,746
Issuance of stock for VSB Bancorp, Inc. acquisition	41,447			$ 39		41,408
Ending Balance (in shares) at Sep. 30, 2020				53,124,898
Ending Balance at Sep. 30, 2020	757,398			$ 648		590,316		(18,993)		330,602			14,407		(159,582)
Beginning Balance (in shares) at Dec. 31, 2020				52,209,897	52,209,897
Beginning Balance at Dec. 31, 2020	753,981	$ (3,087)	$ 750,894	$ 648	$ 648	590,506	$ 590,506	(18,529)	$ (18,529)	338,093	$ (3,087)	$ 335,006	13,160	$ 13,160	(169,897)	$ (169,897)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	54,551									54,551
Other comprehensive income (loss), net of tax	(5,527)												(5,527)
ESOP shares allocated or committed to be released	1,398					661		737
Stock compensation expense	750					750
Restricted stock issuance (in shares)				147,315
Restricted stock issuance	0					(1,821)									1,821
Restricted stock forfeitures (in shares)				(11,791)
Restricted stock forfeitures	$ 0					159									(159)
Exercise of stock options, net (in shares)	262,801			176,966
Exercise of stock options, net						(975)				2,262					3,237
Cash dividends declared and paid										(18,149)
Repurchase of treasury stock (in shares)				(2,966,701)
Repurchase of treasury stock										(46,973)					(46,973)
Ending Balance (in shares) at Sep. 30, 2021				49,555,686
Ending Balance at Sep. 30, 2021	$ 739,206			$ 648		589,280		(17,792)		371,408			7,633		(211,971)
Beginning Balance (in shares) at Jun. 30, 2021				50,843,651
Beginning Balance at Jun. 30, 2021	753,210			$ 648		589,664		(18,040)		361,638			10,455		(191,155)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,080									16,080
Other comprehensive income (loss), net of tax	(2,822)												(2,822)
ESOP shares allocated or committed to be released	495					247		248
Stock compensation expense	246					246
Restricted stock forfeitures (in shares)				(8,554)
Restricted stock forfeitures	0					111									(111)
Exercise of stock options, net (in shares)				44,196
Exercise of stock options, net	447					(988)									1,435
Cash dividends declared and paid	(6,310)									(6,310)
Repurchase of treasury stock (in shares)				(1,323,607)
Repurchase of treasury stock	(22,140)														(22,140)
Ending Balance (in shares) at Sep. 30, 2021				49,555,686
Ending Balance at Sep. 30, 2021	$ 739,206			$ 648		$ 589,280		$ (17,792)		$ 371,408			$ 7,633		$ (211,971)

Consolidated Statements of Ch_2

Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (usd per share)	$ 0.13	$ 0.11	$ 0.37	$ 0.33
Dividends paid per share (usd per share)	0.13	$ 0.11	0.37	0.33
Treasury stock repurchased cost per share (usd per share)	$ 16.63		$ 15.79	$ 12.24

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Statement of Cash Flows [Abstract]
Net income	$ 54,551	$ 23,926
Adjustments to reconcile net income to net cash provided by operating activities:
(Benefit)/provision for credit losses	(6,223)	10,269
ESOP and stock compensation expense	2,148	2,301
Depreciation	2,919	2,603
Amortization of premiums, and deferred loan costs, net of (accretion) discounts, and deferred loan fees	807	3,450
Amortization of intangible assets	150	165
Amortization of operating lease right-of-use assets	3,274	3,665
Income on bank-owned life insurance	(2,567)	(2,635)
Net gain on sale of loans held-for-sale	(1,401)	(665)
Gains on available-for-sale debt securities, net	(976)	(105)
Gains on trading securities, net	(1,096)	(397)
Net sales of trading securities	626	626
Decrease in accrued interest receivable	864	1,963
Increase in other assets	(10,970)	(6,632)
Increase (decrease) in accrued expenses and other liabilities	1,297	(9,117)
Net cash provided by operating activities	43,403	29,417
Cash flows from investing activities:
Net increase in loans receivable	(116,535)	(162,384)
Proceeds from sale of loans held-for-sale	151,559	48,165
Purchases of FHLB of New York stock	(220)	(10,497)
Redemptions of FHLB of New York stock	6,525	20,610
Purchases of debt securities available-for-sale	(409,506)	(302,378)
Purchases of equity securities	(5,000)	(4,276)
Principal payments and maturities on debt securities available-for-sale	370,992	389,799
Principal payments and maturities on debt securities held-to-maturity	1,376	627
Proceeds from sale of debt securities available-for-sale	207,991	17,121
Proceeds from sale of equity securities	34	3,115
Proceeds from bank-owned life insurance	1,021	2,716
Purchases and improvements of premises and equipment	(1,293)	(1,576)
Net cash acquired in business combination	0	72,875
Net cash provided by investing activities	206,944	73,917
Cash flows from financing activities:
Net increase in deposits	64,829	358,339
Dividends paid	(18,149)	(15,905)
Exercise of stock options	2,262	175
Purchase of treasury stock	(46,973)	(107)
Increase (decrease) in advance payments by borrowers for taxes and insurance	3,819	(2,716)
Proceeds from securities sold under agreements to repurchase and other borrowings	15	370,901
Repayments related to securities sold under agreements to repurchase and other borrowings	(170,000)	(611,000)
Net cash (used in) provided by financing activities	(164,197)	99,687
Net increase in cash and cash equivalents	86,150	203,021
Cash and cash equivalents at beginning of period	87,544	147,818
Cash and cash equivalents at end of period	173,694	350,839
Cash paid during the period for:
Interest	13,665	33,468
Income taxes	27,090	11,910
Non-cash transactions:
Loan charge-offs, net	2,875	260
Transfer of loans held-for-investment to loans-held-for-sale at fair value	131,883	47,500
Transfer of loans held-for-sale at fair value to loans held-for-investment	1,612	0
Transfer of loans held-for-investment to other real estate owned	100	0
Right-of-use assets obtained in exchange for new lease liabilities	1,596	3,028
Non-cash assets acquired, at fair value:
Debt securities available for sale	0	126,931
Loans	0	180,431
Accrued interest receivable	0	1,415
Bank-owned life insurance	0	5,714
Premises and equipment	0	7,789
Goodwill	0	3,183
Other assets	0	4,702
Total non-cash assets acquired	0	330,165
Non-cash liabilities assumed at fair value:
Deposits	0	354,592
Other liabilities	0	7,001
Total non-cash liabilities assumed	0	361,593
Net non-cash liabilities assumed	0	(31,428)
Net cash and cash equivalents acquired	0	72,875
Common stock issued in acquisition	$ 0	$ 41,447

Consolidated Financial Statemen

Consolidated Financial Statements	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidated Financial Statements	Consolidated Financial Statements Basis of Presentation The consolidated financial statements are comprised of the accounts of Northfield Bancorp, Inc. (and its wholly owned subsidiaries, Northfield Investments, Inc. and Northfield Bank (the “ Bank ” ), and the Bank’s wholly-owned subsidiaries, NSB Services Corp. and NSB Realty Trust, collectively the “ Company ” ). All significant intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting solely of normal and recurring adjustments) necessary for the fair presentation of the consolidated balance sheets and the consolidated statements of comprehensive income for the unaudited periods presented have been included. The results of operations and other data presented for the three and nine months ended September 30, 2021 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2021 or for any other period. Whenever necessary, certain prior year amounts are reclassified to conform to the current year presentation. In preparing the unaudited consolidated financial statements in conformity with U.S. generally accepted accounting principles ( “ U.S. GAAP ” ), management has made estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated balance sheets and for the periods indicated in the consolidated statements of comprehensive income. Material estimates that are particularly susceptible to change are: the allowance for credit losses, estimated cash flows of our purchased credit-deteriorated (“PCD”, or, previously, purchased credit-impaired “PCI”) loans and the valuation allowance against deferred tax assets. Estimates and assumptions are reviewed periodically and the effects of revisions are reflected in the consolidated financial statements in the period they are deemed necessary. While management uses its best judgment, actual amounts or results could differ significantly from those estimates. Certain information and note disclosures usually included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission ( “ SEC ” ) for the preparation of interim financial statements. The consolidated financial statements presented should be read in conjunction with the audited consolidated financial statements and notes to consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2020, as filed with the SEC. Loans and Allowance for Credit Losses On January 1, 2021, the Company adopted ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): “Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”) which replaces the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss (“CECL”) methodology. The Company used the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. The adoption of the new standard resulted in the Company recording an increase in the allowance for credit losses of $11.1 million, comprised of $10.4 million and $737,000 for loans and unfunded commitments, respectively, including $6.8 million related to PCD loans. For PCD loans, the allowance for credit losses recorded is recognized through a gross-up that increases the amortized cost basis of loans with a corresponding increase to the allowance for credit losses, and therefore results in no impact to shareholders' equity. The remaining increase to the allowance for credit losses of $4.3 million was offset in stockholders' equity and deferred taxes. As a result of adopting CECL, the Company's prior distinction between the originated loan portfolio and the non-PCD acquired loan portfolio is no longer necessary. Results for reporting periods beginning after January 1, 2021 are presented under CECL, while prior period amounts continue to be recorded with previously applicable U.S. GAAP. Further information regarding the impact of CECL can be found in Note 6 - Loans Note 7 – Allowance for Credit Losses on Loans Note 15 - Recent Accounting Pronouncements Adopted COVID-19 The Coronavirus Disease ("COVID-19") pandemic has negatively impacted the national and local economy, disrupted supply chains and increased unemployment levels. While vaccination rollouts, government stimulus, continued business re-openings and increased consumer activity (as social restrictions have eased) led to a sharp rebound in economic activity during the first nine months of 2021, there are substantial variations in the pace of recovery across and within corporate sectors, and economic activity both on a national level and in the markets we serve has not yet returned to pre-pandemic levels. In addition, the rise in cases of the new COVID-19 delta variant may threaten to undermine the economic recovery. The Company is committed to supporting its customers, employees and communities and continues to update protocols to adapt to the changing environment. The Company's bank branches offer drive through services without interruption, while lobbies are fully open or accessible to clients via appointment. The Company continues to provide secure and efficient remote and in-person work options for back office employees. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security (“CARES”) Act was signed into law. It contains substantial tax and spending provisions intended to address the impact of the COVID-19 pandemic. The CARES Act includes a range of other provisions designed to support the U.S. economy and mitigate the impact of COVID-19 on financial institutions and their customers, including through the authorization of various relief programs and measures that the U.S. Department of the Treasury, the Small Business Administration (“SBA”), the Board of Governors of the Federal Reserve System, and other federal banking agencies have implemented or may implement. The CARES Act includes a provision that permits a financial institution to elect to suspend temporarily troubled debt restructures (“TDR”) accounting under current U.S. GAAP in certain circumstances. To be eligible, a loan modification must be: (1) related to COVID-19; (2) executed on a loan that was not more than 30 days past due as of December 31, 2019; and (3) executed between March 1, 2020, and the earlier of (a) 60 days after the date of termination of the national emergency or (b) December 31, 2020. This relief was further extended by the Consolidated Appropriations Act to the earlier of January 1, 2022 or 60 days after the date of termination of the national emergency. The relief provided includes short-term (e.g., up to six months) modifications such as payment deferrals, fee waivers, extensions of repayment terms, or delays in payment that are insignificant. Borrowers considered current are those that are less than 30 days past due on their contractual payments at the time a modification program is implemented. The banking regulators issued similar guidance, which also clarified that a COVID-19-related modification should not be considered a TDR if the borrower was current on payments at the time the underlying loan modification program was implemented and if the modification is considered to be short-term. In response to the COVID-19 pandemic and its economic impact to customers, the Company introduced a short-term modification program in March 2020 that provided temporary payment relief to those borrowers directly impacted by COVID-19. The program allows for a deferral of payments typically for 90 days, which may be extended for additional 90 day periods. See Note 6 - Loans A provision in the CARES Act provided for a loan guarantee program called the Paycheck Protection Program (“PPP”), which provided 100% federally guaranteed loans for small businesses to cover payroll, utilities, rent and interest. These small business loans are fully guaranteed by the SBA and may be forgiven if borrowers maintain their payrolls and satisfy certain other conditions for a period of time during the COVID-19 pandemic. As of September 30, 2021, the Company had originated over 2,300 PPP loans to new and existing customers, totaling approximately $232.2 million. The PPP provides for lender processing fees that range from 1% to 5% of the final disbursement made to individual borrowers. As of September 30, 2021, we have received cumulative loan processing fees of $9.5 million, of which $6.2 million has been recognized in earnings through September 30, 2021, including $4.3 million recognized in the nine months ended September 30, 2021. The remaining unearned fees will be recognized in income over the remaining term of the loans. PPP loans are fully guaranteed by the SBA and are therefore excluded from the allowance for credit and lease losses calculation. There were 733 PPP loans totaling $72.9 million in our loan portfolio at September 30, 2021. The Company continues to maintain a strong liquidity and capital position as a buffer to protect against the economic uncertainties presented by the COVID-19 pandemic. As of September 30, 2021, both the Company and the Bank's capital ratios were in excess of regulatory requirements and are both currently classified as well capitalized. The Company maintains access to multiple sources of liquidity and expects to have sufficient funds available to meet current commitments in the normal course of business.

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Business Combinations	Business Combinations On July 1, 2020, the Company completed its acquisition of VSB Bancorp, Inc. (“Victory”), parent company of Victory State Bank, in a stock transaction, which after purchase accounting adjustments, added $402.8 million to total assets, including $180.4 million to loans, and $354.6 million to deposits, and six branch offices in Staten Island, New York. Under the terms of the merger agreement, each share of Victory common stock was exchanged for 2.0463 shares of Northfield common stock with fractional shares paid out in cash. The transaction was accounted for under the acquisition method of accounting. Under this method of accounting, the purchase price has been allocated to the respective assets acquired and liabilities assumed based upon their estimated fair values, net of tax, as of July 1, 2020, and results of operations have been included in the Company's consolidated statements of income from that date forward. The excess of consideration paid over the fair value of the net assets acquired has been recorded as goodwill. The following table summarizes the estimated fair values of the assets acquired and the liabilities assumed at the date of acquisition for Victory (in thousands): July 1, 2020 Fair Value Total Purchase Price $ 41,173 Assets acquired: Cash and cash equivalents $ 72,875 Debt securities available for sale 126,931 Loans 180,431 Accrued interest receivable 1,415 Bank-owned life insurance 5,714 Premises and equipment 7,789 Other assets 5,010 Total assets acquired 400,165 Liabilities assumed: Deposits 354,592 Other liabilities 7,001 Total liabilities assumed 361,593 Net assets acquired $ 38,572 Goodwill recorded in the merger $ 2,601 The calculation of goodwill is subject to change for up to one year after the date of acquisition as additional information that existed as of the acquisition date estimates and uncertainties become available. As of September 30, 2021, the Company finalized its review of the acquired assets and liabilities and recorded an adjustment to the carrying value of goodwill and a corresponding adjustment to deferred tax assets of $304,000. Fair Value Measurement of Assets Assumed and Liabilities Assumed Described below are the methods used to determine the fair value of the significant assets acquired and liabilities assumed in the Victory acquisition. Cash and Cash Equivalents. The estimated fair values of cash and cash equivalents approximate their stated face amounts, as these financial instruments are either due on demand or have short-term maturities. Debt Securities Available-for-Sale. The estimated fair values of the securities were calculated utilizing Level 2 inputs. Prices for the securities were obtained from an independent nationally recognized third-party pricing service. Loans. The acquired loan portfolio was valued based on current guidance which defines fair value as the price that would be received to sell an asset or transfer a liability in an orderly transaction between market participants at the measurement date. Level 3 inputs were utilized to value the portfolio and included the use of present value techniques employing cash flow estimates and the incorporated assumptions that marketplace participants would use in estimating fair values. In instances where reliable market information was not available, the Company used its own assumptions in an effort to determine reasonable fair value. Specifically, management utilized three separate fair value analyses which a market participant would employ in estimating the total fair value adjustment. The three separate fair valuation methodologies used were: 1) interest rate loan fair value analysis; 2) general credit fair value adjustment; and 3) specific credit fair value adjustment. To prepare the interest rate fair value analysis, loans were grouped by characteristics such as loan type, term, collateral and rate. Market rates for similar loans were obtained from various external data sources and reviewed by Company management for reasonableness. The average of these rates was used as the fair value interest rate a market participant would utilize. A present value approach was utilized to calculate the interest rate fair value adjustment. The general credit fair value adjustment was calculated using a two-part general credit fair value analysis: 1) expected credit losses; and 2) estimated fair value adjustment for qualitative factors. The expected credit losses were calculated using an average of historical losses of the acquired bank and industry bench mark loss rates observed for loans with similar underlying characteristics. The adjustment related to qualitative factors was impacted by general economic conditions and the risk related to lack of familiarity with the originator's underwriting process. To calculate the specific credit fair value adjustment, management reviewed the acquired loan portfolio for loans meeting the definition of an impaired loan with deteriorated credit quality. Loans meeting this definition were reviewed by comparing the contractual cash flows to expected collectible cash flows. The aggregate expected cash flows less the acquisition date fair value resulted in an accretable yield amount. The accretable yield amount will be recognized over the life of the loans on a level yield basis as an adjustment to yield. The following is a summary of the credit impaired loans acquired in the Victory acquisition as of the closing date (in thousands): July 1, 2020 Contractually required principal and interest $ 7,809 Contractual cash flows not expected to be collected (non-accretable discount) 3,315 Expected cash flows to be collected at acquisition 4,494 Interest component of expected cash flows (accretable yield) (599) Fair value of acquired loans $ 3,895 Leases. Five lease obligations were added as part of the acquisition, and the Company recorded a $2.5 million operating lease right-of-use asset and operating lease liability for these lease obligations.

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 The following is a comparative summary of mortgage-backed and other debt securities available-for-sale at September 30, 2021, and December 31, 2020 (in thousands): September 30, 2021 Gross Gross Estimated Amortized unrealized unrealized fair cost gains losses value U.S. Government agency securities $ 2,344 $ — $ (17) $ 2,327 Mortgage-backed securities: Pass-through certificates: Government sponsored enterprises ("GSEs") 356,687 7,341 (928) 363,100 Real estate mortgage investment conduits ("REMICs"): GSE 556,639 4,406 (832) 560,213 913,326 11,747 (1,760) 923,313 Other debt securities: Municipal bonds 77 1 — 78 Corporate bonds 158,608 579 (94) 159,093 158,685 580 (94) 159,171 Total debt securities available-for-sale $ 1,074,355 $ 12,327 $ (1,871) $ 1,084,811 December 31, 2020 Gross Gross Estimated Amortized unrealized unrealized fair cost gains losses value U.S. Government agency securities $ 3,168 $ — $ (10) $ 3,158 Mortgage-backed securities: Pass-through certificates: GSE 270,867 10,720 (244) 281,343 REMICs: GSE 884,414 7,027 (476) 890,965 Non-GSE 4 — — 4 1,155,285 17,747 (720) 1,172,312 Other debt securities: Municipal bonds 122 1 — 123 Corporate bonds 87,319 1,099 — 88,418 Asset-backed securities 779 15 — 794 88,220 1,115 — 89,335 Total debt securities available-for-sale $ 1,246,673 $ 18,862 $ (730) $ 1,264,805 The following is a summary of the expected maturity distribution of debt securities available-for-sale, other than mortgage-backed securities, at September 30, 2021 (in thousands): Available-for-sale Amortized cost Estimated fair value Due in one year or less $ 45,327 $ 45,587 Due after one year through five years 98,348 98,631 Due after five years through ten years 17,354 17,280 $ 161,029 $ 161,498 Contractual maturities for mortgage-backed securities are not included above, as expected maturities on mortgage-backed securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without penalties. Certain debt securities available-for-sale are pledged or encumbered to secure borrowings under Pledge Agreements and Repurchase Agreements and for other purposes required by law. At September 30, 2021, the fair value of debt securities available-for-sale that were pledged to secure borrowings and deposits was $498.2 million. For the three months ended September 30, 2021, the Company had gross proceeds of $112.5 million on sales of debt securities available-for-sale, with gross realized gains of $370,000 and no gross realized losses. For the nine months ended September 30, 2021, the Company had gross proceeds of $208.0 million on sales and calls of debt securities available-for-sale, with gross realized gains of $976,000 and no gross realized losses. For the three months ended September 30, 2020, the Company had gross proceeds of $4.5 million on sales and calls of debt securities available-for-sale, with gross realized gains of $48,000 related to sales of securities and gross realized losses of $3,000 related to calls of securities. For the nine months ended September 30, 2020, the Company had gross proceeds of $17.1 million on sales and calls of debt securities available-for-sale, with gross realized gains of $122,000 related to sales of securities and gross realized losses of $17,000 related to calls of securities. The Company recognized net losses of $75,000 and net gains of $1.1 million on its trading securities portfolio during the three and nine months ended September 30, 2021, respectively. During the three and nine months ended September 30, 2020, the Company recognized net gains of $763,000 and $397,000, respectively, on its trading securities portfolio. Gross unrealized losses on mortgage-backed and other debt securities available-for-sale, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2021, and December 31, 2020, were as follows (in thousands): September 30, 2021 Less than 12 months 12 months or more Total Unrealized Estimated Unrealized Estimated Unrealized Estimated losses fair value losses fair value losses fair value U.S. Government agency securities $ (17) $ 2,327 $ — $ — $ (17) $ 2,327 Mortgage-backed securities: Pass-through certificates: GSE (684) 151,998 (244) 15,056 (928) 167,054 REMICs: GSE (783) 126,493 (49) 4,049 (832) 130,542 Other debt securities: Corporate bonds (94) 49,905 — — (94) 49,905 Total $ (1,578) $ 330,723 $ (293) $ 19,105 $ (1,871) $ 349,828 December 31, 2020 Less than 12 months 12 months or more Total Unrealized Estimated Unrealized Estimated Unrealized Estimated losses fair value losses fair value losses fair value U.S. Government agency securities $ (10) $ 3,158 $ — $ — $ (10) $ 3,158 Mortgage-backed securities: Pass-through certificates: GSE (233) 28,419 (11) 459 (244) 28,878 REMICs: GSE (476) 210,569 — — (476) 210,569 Total $ (719) $ 242,146 $ (11) $ 459 $ (730) $ 242,605 The Company held 15 pass-through mortgage-backed securities issued or guaranteed by GSEs and 18 REMIC mortgage-backed securities issued or guaranteed by GSEs that were in a continuous unrealized loss position of twelve months or greater at September 30, 2021. There were 14 pass-through mortgage-backed securities issued or guaranteed by GSEs, 19 REMIC mortgage-backed securities issued or guaranteed by GSEs, six corporate bonds and one U.S. Government agency security that were in an unrealized loss position of less than twelve months at September 30, 2021. All securities referred to above were rated investment grade at September 30, 2021. Available for sale debt securities in unrealized loss positions are evaluated for impairment related to credit losses on a quarterly basis. In performing an assessment of whether any decline in fair value is due to a credit loss, the Company considers the extent to which the fair value is less than the amortized cost, changes in credit ratings, any adverse economic conditions, as well as all relevant information at the individual security level such as credit deterioration of the issuer or collateral underlying the security. In assessing the impairment, the Company compares the present value of cash flows expected to be collected with the amortized cost basis of the security. If it is determined that the decline in fair value was due to credit losses, an allowance for credit losses is recorded, limited to the amount the fair value is less than amortized cost basis. The Company did not recognize any allowance for credit losses on its available-for-sale debt securities during the three and nine months ended September 30, 2021. The non-credit related decrease in the fair value, such as a decline due to changes in market interest rates, is recorded in other comprehensive income, net of tax. The Company also assesses the intent to sell the securities (as well as the likelihood of a near-term recovery). If the Company intends to sell an available for sale debt security or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis, the debt security is written down to its fair value and the write down is charged to the debt security’s fair value at the reporting date with any incremental impairment reported in earnings. The Company has made the accounting policy election to exclude accrued interest receivable on available-for-sale securities from the estimate of credit losses. Accrued interest receivable associated with debt securities available-for-sale totaling $1.7 million at September 30, 2021 was reported in accrued interest receivable on the consolidated balance sheet.

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 Held-to-Maturity The following is a summary of mortgage-backed securities held-to-maturity at September 30, 2021 and December 31, 2020 (in thousands): September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Mortgage-backed securities: Pass-through certificates: GSE $ 5,811 $ 272 $ — $ 6,083 Total securities held-to-maturity $ 5,811 $ 272 $ — $ 6,083 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Mortgage-backed securities: Pass-through certificates: GSE $ 7,234 $ 340 $ — $ 7,574 Total securities held-to-maturity $ 7,234 $ 340 $ — $ 7,574 Contractual maturities for mortgage-backed securities are not presented, as expected maturities on mortgage-backed securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without penalties. There were no sales of held-to-maturity securities for the nine months ended September 30, 2021 or September 30, 2020. At September 30, 2021, debt securities held-to-maturity with a carrying value of $736,000 were pledged to secure borrowings and deposits. At September 30, 2021 and December 31, 2020, there were no debt securities held-to-maturity in an unrealized loss position. The Company's held-to-maturity securities are residential mortgage-backed securities issued by Ginnie Mae, Freddie Mac and Fannie Mae, and it is expected that the securities will not be settled at prices less than the amortized cost bases of the securities as such securities are backed by the full faith and credit of and/or guaranteed by the U.S. Government. Accordingly, no allowance for credit losses has been recorded for these securities. The Company has made the accounting policy election to exclude accrued interest receivable on held-to-maturity securities from the estimate of credit losses. Accrued interest receivable associated with held-to-maturity securities totaling $18,000 at September 30, 2021 was reported in accrued interest receivable on the consolidated balance sheet.

Equity Securities

Equity Securities	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Equity Securities	Debt Securities Available-for-Sale The following is a comparative summary of mortgage-backed and other debt securities available-for-sale at September 30, 2021, and December 31, 2020 (in thousands): September 30, 2021 Gross Gross Estimated Amortized unrealized unrealized fair cost gains losses value U.S. Government agency securities $ 2,344 $ — $ (17) $ 2,327 Mortgage-backed securities: Pass-through certificates: Government sponsored enterprises ("GSEs") 356,687 7,341 (928) 363,100 Real estate mortgage investment conduits ("REMICs"): GSE 556,639 4,406 (832) 560,213 913,326 11,747 (1,760) 923,313 Other debt securities: Municipal bonds 77 1 — 78 Corporate bonds 158,608 579 (94) 159,093 158,685 580 (94) 159,171 Total debt securities available-for-sale $ 1,074,355 $ 12,327 $ (1,871) $ 1,084,811 December 31, 2020 Gross Gross Estimated Amortized unrealized unrealized fair cost gains losses value U.S. Government agency securities $ 3,168 $ — $ (10) $ 3,158 Mortgage-backed securities: Pass-through certificates: GSE 270,867 10,720 (244) 281,343 REMICs: GSE 884,414 7,027 (476) 890,965 Non-GSE 4 — — 4 1,155,285 17,747 (720) 1,172,312 Other debt securities: Municipal bonds 122 1 — 123 Corporate bonds 87,319 1,099 — 88,418 Asset-backed securities 779 15 — 794 88,220 1,115 — 89,335 Total debt securities available-for-sale $ 1,246,673 $ 18,862 $ (730) $ 1,264,805 The following is a summary of the expected maturity distribution of debt securities available-for-sale, other than mortgage-backed securities, at September 30, 2021 (in thousands): Available-for-sale Amortized cost Estimated fair value Due in one year or less $ 45,327 $ 45,587 Due after one year through five years 98,348 98,631 Due after five years through ten years 17,354 17,280 $ 161,029 $ 161,498 Contractual maturities for mortgage-backed securities are not included above, as expected maturities on mortgage-backed securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without penalties. Certain debt securities available-for-sale are pledged or encumbered to secure borrowings under Pledge Agreements and Repurchase Agreements and for other purposes required by law. At September 30, 2021, the fair value of debt securities available-for-sale that were pledged to secure borrowings and deposits was $498.2 million. For the three months ended September 30, 2021, the Company had gross proceeds of $112.5 million on sales of debt securities available-for-sale, with gross realized gains of $370,000 and no gross realized losses. For the nine months ended September 30, 2021, the Company had gross proceeds of $208.0 million on sales and calls of debt securities available-for-sale, with gross realized gains of $976,000 and no gross realized losses. For the three months ended September 30, 2020, the Company had gross proceeds of $4.5 million on sales and calls of debt securities available-for-sale, with gross realized gains of $48,000 related to sales of securities and gross realized losses of $3,000 related to calls of securities. For the nine months ended September 30, 2020, the Company had gross proceeds of $17.1 million on sales and calls of debt securities available-for-sale, with gross realized gains of $122,000 related to sales of securities and gross realized losses of $17,000 related to calls of securities. The Company recognized net losses of $75,000 and net gains of $1.1 million on its trading securities portfolio during the three and nine months ended September 30, 2021, respectively. During the three and nine months ended September 30, 2020, the Company recognized net gains of $763,000 and $397,000, respectively, on its trading securities portfolio. Gross unrealized losses on mortgage-backed and other debt securities available-for-sale, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2021, and December 31, 2020, were as follows (in thousands): September 30, 2021 Less than 12 months 12 months or more Total Unrealized Estimated Unrealized Estimated Unrealized Estimated losses fair value losses fair value losses fair value U.S. Government agency securities $ (17) $ 2,327 $ — $ — $ (17) $ 2,327 Mortgage-backed securities: Pass-through certificates: GSE (684) 151,998 (244) 15,056 (928) 167,054 REMICs: GSE (783) 126,493 (49) 4,049 (832) 130,542 Other debt securities: Corporate bonds (94) 49,905 — — (94) 49,905 Total $ (1,578) $ 330,723 $ (293) $ 19,105 $ (1,871) $ 349,828 December 31, 2020 Less than 12 months 12 months or more Total Unrealized Estimated Unrealized Estimated Unrealized Estimated losses fair value losses fair value losses fair value U.S. Government agency securities $ (10) $ 3,158 $ — $ — $ (10) $ 3,158 Mortgage-backed securities: Pass-through certificates: GSE (233) 28,419 (11) 459 (244) 28,878 REMICs: GSE (476) 210,569 — — (476) 210,569 Total $ (719) $ 242,146 $ (11) $ 459 $ (730) $ 242,605 The Company held 15 pass-through mortgage-backed securities issued or guaranteed by GSEs and 18 REMIC mortgage-backed securities issued or guaranteed by GSEs that were in a continuous unrealized loss position of twelve months or greater at September 30, 2021. There were 14 pass-through mortgage-backed securities issued or guaranteed by GSEs, 19 REMIC mortgage-backed securities issued or guaranteed by GSEs, six corporate bonds and one U.S. Government agency security that were in an unrealized loss position of less than twelve months at September 30, 2021. All securities referred to above were rated investment grade at September 30, 2021. Available for sale debt securities in unrealized loss positions are evaluated for impairment related to credit losses on a quarterly basis. In performing an assessment of whether any decline in fair value is due to a credit loss, the Company considers the extent to which the fair value is less than the amortized cost, changes in credit ratings, any adverse economic conditions, as well as all relevant information at the individual security level such as credit deterioration of the issuer or collateral underlying the security. In assessing the impairment, the Company compares the present value of cash flows expected to be collected with the amortized cost basis of the security. If it is determined that the decline in fair value was due to credit losses, an allowance for credit losses is recorded, limited to the amount the fair value is less than amortized cost basis. The Company did not recognize any allowance for credit losses on its available-for-sale debt securities during the three and nine months ended September 30, 2021. The non-credit related decrease in the fair value, such as a decline due to changes in market interest rates, is recorded in other comprehensive income, net of tax. The Company also assesses the intent to sell the securities (as well as the likelihood of a near-term recovery). If the Company intends to sell an available for sale debt security or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis, the debt security is written down to its fair value and the write down is charged to the debt security’s fair value at the reporting date with any incremental impairment reported in earnings. The Company has made the accounting policy election to exclude accrued interest receivable on available-for-sale securities from the estimate of credit losses. Accrued interest receivable associated with debt securities available-for-sale totaling $1.7 million at September 30, 2021 was reported in accrued interest receivable on the consolidated balance sheet.

Loans

Loans	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Loans	Loans On January 1, 2021, the Company adopted the CECL standard for measuring credit losses, which replaced the incurred loss methodology. As a result of adopting CECL, the Company combined its originated loan portfolio and the acquired loan portfolio into the respective portfolio segments. Other than to combine the originated and non-PCD acquired loan portfolios, the Company's portfolio segments and loan classes remain unchanged following the adoption of the CECL standard. Prior period disclosures have been revised to conform to current period presentation (by combining originated and acquired portfolio segments), however, the Company did not recast comparative financial information and that is still presented in accordance with previous applicable provisions of U.S. GAAP. The following table summarizes the Company’s loans held-for-investment (in thousands): September 30, December 31, 2021 2020 Real estate loans: Multifamily $ 2,546,296 $ 2,509,310 Commercial mortgage 783,355 716,973 One-to-four family residential mortgage 187,051 210,817 Home equity and lines of credit 102,023 91,126 Construction and land 26,205 74,318 Total real estate loans 3,644,930 3,602,544 Commercial and industrial loans (1) 153,720 194,352 Other loans 2,255 3,029 Total commercial and industrial and other loans 155,975 197,381 Deferred origination loan costs, net (2) — 4,795 Loans held-for-investment, net (excluding PCD/PCI) 3,800,905 3,804,720 PCD/PCI loans 16,054 18,518 Total Loans held-for-investment, net 3,816,959 3,823,238 Allowance for credit losses (38,862) (37,607) Net loans held-for-investment $ 3,778,097 $ 3,785,631 (1) Included in commercial and industrial loans at September 30, 2021 and December 31, 2020 are PPP loans totaling $72.9 million and $126.5 million, respectively. (2) Under CECL, origination deferred fees, deferred fees on acquired loans, and purchase accounting adjustments in connection with loans acquired are included in loans by respective portfolio. The Company had no loans held-for-sale at September 30, 2021. At December 31, 2020, loans held-for-sale totaled $19.9 million. In addition to originating loans, the Company may acquire loans through portfolio purchases or acquisitions of other companies. Purchased loans that have evidence of more than insignificant credit deterioration since origination are deemed purchased credit deteriorated (“PCD”) loans. In accordance with ASU 2016-13, with its adoption of the CECL standard, the Company did not reassess whether previously recognized PCI loans accounted for under prior accounting guidance met the criteria of a PCD loan as of the date of adoption. All loans considered to be PCI prior to the adoption of CECL were converted to PCD upon adoption. For PCD loans, each loan pool is accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. PCD loans totaled $16.1 million at September 30, 2021, as compared to $18.5 million of PCI loans at December 31, 2020. The majority of the PCD loan balance is attributable to those loans acquired as part of a Federal Deposit Insurance Corporation-assisted transaction. At September 30, 2021, PCD loans consisted of approximately 16% one-to-four family residential loans, 25% commercial real estate loans and 47% commercial and industrial loans, with the remaining balance in construction and home equity loans. At December 31, 2020, PCI loans consisted of approximately 22% one-to-four family residential loans, 23% commercial real estate loans and 40% commercial and industrial loans, with the remaining balance in home equity loans. Credit Quality Indicators The Company monitors the credit quality of its loan portfolio on a regular basis. Credit quality is monitored by reviewing certain credit quality indicators. Management has determined that loan-to-value ratios (at period end) and internally assigned credit risk ratings by loan type are the key credit quality indicators that best measure the credit quality of the Company’s loan receivables. Loan-to-value ( “LTV” ) ratios used by management in monitoring credit quality are based on current period loan balances and original appraised values at the time of origination (unless a current appraisal has been obtained as a result of the loan being deemed impaired). The Company maintains a credit risk rating system as part of the risk assessment of its loan portfolio. The Company’s lending officers are required to assign a credit risk rating to each loan in their portfolio at origination. This risk rating is reviewed periodically and adjusted if necessary. Monthly, management presents monitored assets to the loan committee. In addition, the Company engages a third-party independent loan reviewer that performs semi-annual reviews of a sample of loans, validating the credit risk ratings assigned to such loans. The credit risk ratings play an important role in the establishment of the provision for credit losses on loans and the allowance for credit losses for loans held-for-investment. After determining the loss factor for each portfolio segment held-for-investment, the collectively evaluated for impairment balance of the held-for-investment portfolio is multiplied by the collectively evaluated for impairment loss factor for the respective portfolio segment in order to determine the allowance for loans collectively evaluated for impairment. When assigning a risk rating to a loan, management utilizes the Bank’s internal nine-point credit risk rating system. 1. Strong 2. Good 3. Acceptable 4. Adequate 5. Watch 6. Special Mention 7. Substandard 8. Doubtful 9. Loss Loans rated 1 to 5 are considered pass ratings. An asset is classified substandard if it is inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Substandard assets have well defined weaknesses based on objective evidence, and are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Assets classified as doubtful have all of the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses present make collection or liquidation in full highly questionable and improbable based on current circumstances. Assets classified as loss are those considered uncollectible and of such little value that their continuance as assets is not warranted. Assets which do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories, but possess weaknesses, are required to be designated special mention. The following table presents the Company’s loans held-for-investment, excluding PCD loans, by loan class, credit risk ratings and year of origination, at September 30, 2021 (in thousands): September 30, 2021 2021 2020 2019 2018 2017 Prior Revolving Loans Total Real Estate: Multifamily Pass $ 531,300 $ 545,674 $ 355,399 $ 276,368 $ 244,623 $ 575,489 $ 489 $ 2,529,342 Special Mention — — — — — 429 — 429 Substandard — — 4,660 3,803 — 8,062 — 16,525 Total multifamily 531,300 545,674 360,059 280,171 244,623 583,980 489 2,546,296 Commercial Pass 89,850 73,551 98,944 100,274 67,806 288,266 36,596 755,287 Special Mention — — 508 — 500 4,742 — 5,750 Substandard — — 7,884 — 2,372 8,718 3,344 22,318 Total commercial 89,850 73,551 107,336 100,274 70,678 301,726 39,940 783,355 One-to-four family residential Pass 4,784 9,342 12,089 13,530 12,359 128,149 603 180,856 Special Mention — — 529 — — 2,368 — 2,897 Substandard — — 524 — — 2,774 — 3,298 Total one-to-four family residential 4,784 9,342 13,142 13,530 12,359 133,291 603 187,051 Construction and land Pass — 1,556 1,377 525 2,068 3,523 17,156 26,205 Total construction and land — 1,556 1,377 525 2,068 3,523 17,156 26,205 Home equity and lines of credit Pass 31,485 18,195 12,156 9,063 4,142 26,323 — 101,364 Special Mention — — — — — 301 — 301 Substandard — — 97 87 — 174 — 358 Total home equity and lines of credit 31,485 18,195 12,253 9,150 4,142 26,798 — 102,023 Total real estate loans 657,419 648,318 494,167 403,650 333,870 1,049,318 58,188 3,644,930 Commercial and industrial Pass 95,854 25,987 7,399 4,089 1,027 14,882 1,876 151,114 Special Mention — — 279 235 138 253 — 905 Substandard — 395 116 397 — 793 — 1,701 Total commercial and industrial 95,854 26,382 7,794 4,721 1,165 15,928 1,876 153,720 Other Pass 1,929 165 25 33 4 99 — 2,255 Total other 1,929 165 25 33 4 99 — 2,255 Total loans held-for-investment, net $ 755,202 $ 674,865 $ 501,986 $ 408,404 $ 335,039 $ 1,065,345 $ 60,064 $ 3,800,905 The following table details the recorded investment of loans held-for-investment, excluding PCI loans, net of deferred fees and costs, by loan type and credit quality indicator at December 31, 2020 (in thousands): December 31, 2020 Real Estate Multifamily Commercial One-to-Four Family Construction and Land Home Equity and Lines of Credit Commercial and Industrial Other Total Internal Risk Rating Pass $ 2,497,556 $ 667,568 $ 207,633 $ 74,351 $ 92,385 $ 189,372 $ 3,026 $ 3,731,891 Special Mention 458 20,422 2,456 — 311 498 — 24,145 Substandard 14,920 29,576 2,133 — 441 1,611 3 48,684 Total loans held-for-investment, net $ 2,512,934 $ 717,566 $ 212,222 $ 74,351 $ 93,137 $ 191,481 $ 3,029 $ 3,804,720 Past Due and Non-Accrual Loans Included in loans receivable held-for-investment are loans for which the accrual of interest income has been discontinued due to deterioration in the financial condition of the borrowers. The recorded investment of these non-accrual loans was $7.2 million and $8.5 million at September 30, 2021, and December 31, 2020, respectively. Generally, loans are placed on non-accrual status when they become 90 days or more delinquent, or sooner if considered appropriate by management, and remain on non-accrual status until they are brought current, have six consecutive months of performance under the loan terms, and factors indicating reasonable doubt about the timely collection of payments no longer exist. Therefore, loans may be current in accordance with their loan terms, or may be less than 90 days delinquent and still be on a non-accruing status. When an individual loan no longer demonstrates the similar credit risk characteristics as other loans within its current segment, the Company evaluates each for expected credit losses on an individual basis. All non-accrual loans $500,000 and above and all loans designated as TDRs are individually evaluated. The non-accrual amounts included in loans individually evaluated for impairment were $4.3 million and $5.5 million at September 30, 2021, and December 31, 2020, respectively. Loans on non-accrual status with principal balances less than $500,000, and therefore not individually evaluated for impairment, amounted to $2.9 million at September 30, 2021, and $3.0 million at December 31, 2020. Loans past due 90 days or more and still accruing interest were $272,000 at September 30, 2021, and $1.1 million at December 31, 2020, and consisted of loans that are considered well-secured and in the process of collection. The Company had no loans held-for-sale at September 30, 2021. At December 31, 2020, the Company had $19.9 million in loans held-for-sale. At December 31, 2020, the loans held-for-sale were comprised of commercial real estate and multifamily loans, primarily accommodation (hotel or motel) loans that were modified in the form of interest and/or principal payment deferrals due to COVID-19 related hardships, and had not returned to contractual payments after 180 days of relief. The sale of these loans was completed in March 2021. The following tables set forth the detail, and delinquency status, of non-performing loans (non-accrual loans and loans past due 90 days or more and still accruing), net of deferred fees and costs, at September 30, 2021, and December 31, 2020, excluding PCD/PCI loans (in thousands): September 30, 2021 Total Non-Performing Loans Non-Accruing Loans Current 30-89 Days Past Due 90 Days or More Past Due Total 90 Days or More Past Due and Accruing Total Non-Performing Loans Loans held-for-investment: Real estate loans: Commercial Substandard $ 2,907 $ 73 $ 1,887 $ 4,867 $ 206 $ 5,073 Total commercial 2,907 73 1,887 4,867 206 5,073 One-to-four family residential Substandard — — 314 314 60 374 Total one-to-four family residential — — 314 314 60 374 Multifamily Substandard — — 1,903 1,903 — 1,903 Total multifamily — — 1,903 1,903 — 1,903 Home equity and lines of credit Pass — — — — 6 6 Substandard — — 126 126 — 126 Total home equity and lines of credit — — 126 126 6 132 Total real estate 2,907 73 4,230 7,210 272 7,482 Commercial and industrial loans Substandard — 35 — 35 — 35 Total commercial and industrial loans — 35 — 35 — 35 Total non-performing loans $ 2,907 $ 108 $ 4,230 $ 7,245 $ 272 $ 7,517 December 31, 2020 Total Non-Performing Loans Non-Accruing Loans Current 30-89 Days Past Due 90 Days or More Past Due Total 90 Days or More Past Due and Accruing Total Non-Performing Loans Loans held-for-investment: Real estate loans: Commercial Pass $ — $ — $ — $ — $ 500 $ 500 Substandard 2,829 537 2,863 6,229 — 6,229 Total commercial 2,829 537 2,863 6,229 500 6,729 One-to-four family residential Substandard 413 — 493 906 174 1,080 Total one-to-four family residential 413 — 493 906 174 1,080 Multifamily Substandard — — 1,153 1,153 — 1,153 Total multifamily — — 1,153 1,153 — 1,153 Home equity and lines of credit Substandard 60 — 131 191 — 191 Total home equity and lines of credit 60 — 131 191 — 191 Total real estate 3,302 537 4,640 8,479 674 9,153 Commercial and industrial loans Pass — — — — 101 101 Special Mention — — — — 85 85 Substandard — — 37 37 250 287 Total commercial and industrial loans — — 37 37 436 473 Other loans Pass — — — — 3 3 Total other — — — — 3 3 Total non-performing loans $ 3,302 $ 537 $ 4,677 $ 8,516 $ 1,113 $ 9,629 The following tables set forth the detail and delinquency status of loans held-for-investment, excluding PCD/PCI loans, net of deferred fees and costs, at September 30, 2021, and December 31, 2020 (in thousands): September 30, 2021 Past Due Loans 30-89 Days Past Due 90 Days or More Past Due 90 Days or More Past Due and Accruing Total Past Due Current Total Loans Receivable, net Loans held-for-investment: Real estate loans: Commercial Pass $ 346 $ — $ — $ 346 $ 754,941 $ 755,287 Special Mention — — — — 5,750 5,750 Substandard 1,458 1,887 206 3,551 18,767 22,318 Total commercial 1,804 1,887 206 3,897 779,458 783,355 One-to-four family residential Pass 374 — — 374 180,482 180,856 Special Mention 560 — — 560 2,337 2,897 Substandard 160 314 60 534 2,764 3,298 Total one-to-four family residential 1,094 314 60 1,468 185,583 187,051 Construction and land Pass — — — — 26,205 26,205 Total construction and land — — — — 26,205 26,205 Multifamily Pass 1,109 — — 1,109 2,528,233 2,529,342 Special Mention — — — — 429 429 Substandard 2,201 1,903 — 4,104 12,421 16,525 Total multifamily 3,310 1,903 — 5,213 2,541,083 2,546,296 Home equity and lines of credit Pass 64 — 6 70 101,294 101,364 Special Mention 196 — — 196 105 301 Substandard 97 126 — 223 135 358 Total home equity and lines of credit 357 126 6 489 101,534 102,023 Total real estate 6,565 4,230 272 11,067 3,633,863 3,644,930 Commercial and industrial Pass 1,702 — — 1,702 149,412 151,114 Special Mention 94 — — 94 811 905 Substandard 35 — — 35 1,666 1,701 Total commercial and industrial 1,831 — — 1,831 151,889 153,720 Other loans Pass 6 — — 6 2,249 2,255 Total other loans 6 — — 6 2,249 2,255 Total loans held-for-investment $ 8,402 $ 4,230 $ 272 $ 12,904 $ 3,788,001 $ 3,800,905 December 31, 2020 Past Due Loans 30-89 Days Past Due 90 Days or More Past Due 90 Days or More Past Due and Accruing Total Past Due Current Total Loans Receivable, net Loans held-for-investment: Real estate loans: Commercial Pass $ 6,072 $ — $ 500 $ 6,572 $ 660,996 $ 667,568 Special Mention 72 — — 72 20,350 20,422 Substandard 3,185 2,863 — 6,048 23,528 29,576 Total commercial 9,329 2,863 500 12,692 704,874 717,566 One-to-four family residential Pass 282 — — 282 207,351 207,633 Special Mention 870 — — 870 1,586 2,456 Substandard — 493 174 667 1,466 2,133 Total one-to-four family residential 1,152 493 174 1,819 210,403 212,222 Construction and land Pass 994 — — 994 73,357 74,351 Total construction and land 994 — — 994 73,357 74,351 Multifamily Pass 1,283 — — 1,283 2,496,273 2,497,556 Special Mention — — — — 458 458 Substandard 610 1,153 — 1,763 13,157 14,920 Total multifamily 1,893 1,153 — 3,046 2,509,888 2,512,934 Home equity and lines of credit Pass 80 — — 80 92,305 92,385 Special Mention 200 — — 200 111 311 Substandard 100 131 — 231 210 441 Total home equity and lines of credit 380 131 — 511 92,626 93,137 Total real estate 13,748 4,640 674 19,062 3,591,148 3,610,210 Commercial and industrial Pass 632 — 101 733 188,639 189,372 Special Mention 61 — 85 146 352 498 Substandard 67 37 250 354 1,257 1,611 Total commercial and industrial 760 37 436 1,233 190,248 191,481 Other loans Pass 11 — 3 14 3,012 3,026 Substandard — — — — 3 3 Total other loans 11 — 3 14 3,015 3,029 Total loans held-for-investment $ 14,519 $ 4,677 $ 1,113 $ 20,309 $ 3,784,411 $ 3,804,720 The following tables summarize information on non-accrual loans, excluding PCD loans, at September 30, 2021 (in thousands): For the Three Months Ended For the Nine Months Ended September 30, 2021 Recorded Investment Unpaid Principal Balance With No Related Allowance Interest Income Interest Income Real estate loans: Commercial $ 4,867 $ 5,377 $ 3,759 $ 17 $ 67 One-to-four family residential 314 346 — 4 10 Multifamily 1,903 1,912 516 27 60 Home equity and lines of credit 126 375 — — 2 Commercial and industrial 35 357 2 3 7 Total non-accrual loans $ 7,245 $ 8,367 $ 4,277 $ 51 $ 146 The following table summarizes impaired loans, excluding PCI loans, at December 31, 2020 (in thousands): December 31, 2020 Recorded Investment Unpaid Principal Balance Related Allowance With No Allowance Recorded: Real estate loans: Commercial $ 8,838 $ 10,076 $ — One-to-four family residential 1,903 2,032 — Multifamily 626 1,097 — Home equity and lines of credit 15 15 — Total Real Estate 11,382 13,220 — With a Related Allowance Recorded: Real estate loans: Commercial 1,812 2,244 (66) Home equity and lines of credit 32 32 (3) Total Real Estate 1,844 2,276 (69) Commercial and industrial loans 16 16 (4) Total: Real estate loans Commercial 10,650 12,320 (66) One-to-four family residential 1,903 2,032 — Multifamily 626 1,097 — Home equity and lines of credit 47 47 (3) Commercial and industrial loans 16 16 (4) $ 13,242 $ 15,512 $ (73) Included in the table above at December 31, 2020, are impaired loans with carrying balances of $7.8 million that were not written down by charge-offs or for which there are no specific reserves in our allowance for credit losses. Loans not written down by charge-offs or specific reserves at December 31, 2020, are considered to have sufficient collateral values, less costs to sell, to support the carrying balances of the loans. The following table summarizes the average recorded investment in impaired loans, excluding PCI loans, and interest income recognized as of, and for, the three and nine months ended September 30, 2020 (in thousands): For the Three Months Ended For the Nine Months Ended September 30, 2020 September 30, 2020 Average Recorded Investment Interest Income Average Recorded Investment Interest Income With No Allowance Recorded: Real estate loans: Commercial $ 12,633 $ 50 $ 14,415 $ 336 One-to-four family residential 1,920 23 2,192 85 Multifamily 672 10 853 40 Home equity and lines of credit 18 1 19 1 Commercial and industrial loans 37 — 38 — With a Related Allowance Recorded: Real estate loans: Commercial 4,097 26 2,514 83 One-to-four family residential 261 — 131 — Home equity and lines of credit 32 — 32 1 Commercial and industrial loans 17 — 17 — Total: Real estate loans Commercial 16,730 76 16,929 419 One-to-four family residential 2,181 23 2,323 85 Multifamily 672 10 853 40 Home equity and lines of credit 50 1 51 2 Commercial and industrial loans 54 — 55 — $ 19,687 $ 110 $ 20,211 $ 546 Collateral-Dependent Loans Loans for which the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral are considered to be collateral-dependent loans. Collateral can have a significant financial effect in mitigating exposure to credit risk and, where there is sufficient collateral, an allowance for credit losses is not recognized or is minimal. For collateral-dependent loans, the allowance for credit losses is individually assessed based on the fair value of the collateral less estimated costs of sale. The Company's collateral-dependent loans are secured by real estate. Collateral values are generally based on appraisals which are adjusted for changes in market indices. As of September 30, 2021, and December 31, 2020, the Company had $9.1 million and $10.2 million of collateral-dependent impaired loans, respectively. The collateral-dependent loans at September 30, 2021 consisted of $7.6 million of commercial real estate loans, $1.1 million of multifamily loans, and $373,000 of one-to-four family residential loans. For the nine months ended September 30, 2021, there was no significant deterioration or changes in the collateral securing these loans. Troubled Debt Restructured Loans The following tables summarize loans that were modified in a troubled debt restructuring (“TDR”) during the nine months ended September 30, 2021 and September 30, 2020: Nine Months Ended September 30, 2021 Number of Relationships Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (1) (in thousands) Troubled Debt Restructurings Commercial and industrial 1 $ 75 75 Total Troubled Debt Restructurings 1 $ 75 $ 75 (1) Amounts are at time of modification Nine Months Ended September 30, 2020 Number of Relationships Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (1) (in thousands) Troubled Debt Restructurings Residential 1 $ 187 $ 187 Commercial real estate 2 544 544 Total Troubled Debt Restructurings 3 $ 731 $ 731 (1) Amounts are at time of modification There were three commercial and industrial loans to one borrower modified as a TDR during the three and nine months ended September 30, 2021, which were modified to reduce the interest rate, extend the maturity date, and restructure payment terms of the loans. There were four loans (to three borrowers) in the second table above, that requested COVID-19 relief and were modified as TDRs during the nine months ended September 30, 2020, all of which were modified to restructure payment terms. All four of the loans were delinquent and on non-accrual status prior to the implementation of our COVID-19 customer relief program (discussed further below) and were therefore considered to be TDRs. In response to the COVID-19 pandemic and its economic impact to customers, a short-term modification program that complied with Section 4013 of the CARES Act and the Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus was implemented to provide temporary payment relief to those borrowers directly impacted by COVID-19. The program allows for deferral of payments for 90 days, which may extend for an additional 90 day period, with modifications in the form of payment deferrals, fee waivers, extensions of repayment terms, or other delays in payment. As of September 30, 2021, substantially all of the borrowers who had requested relief have returned to contractual payments. Three borrowers, with loans totaling $798,000, did not return to their contractual status; however, they are making partial payments. Loans in deferment status (“COVID-19 Modified Loans”) have continued to accrue interest during the deferment period unless otherwise classified as non-performing. COVID-19 Modified Loans are required to make escrow payments for real estate taxes and insurance, if applicable. The COVID-19 Modified Loan agreements also require loans to be brought back to their fully contractual terms within 12 to 18 months and include covenants that prohibit distributions, bonuses, or payments of management fees to related entities until all deferred payments are made. Consistent with industry regulatory guidance, borrowers who were otherwise current on loan payments and were granted COVID-19 related financial hardship payment deferrals will continue to be reported as current loans throughout the agreed upon deferral period. Borrowers who were delinquent in their payments to the Bank prior to requesting a COVID-19 related financial hardship payment deferral are reviewed on a case by case basis for TDR classification and non-performing loan status. At September 30, 2021 and December 31, 2020, the Company had TDRs of $10.8 million and $12.1 million, respectively.

Allowance for Credit Losses (_A

Allowance for Credit Losses (“ACL”) on Loans	9 Months Ended
	Sep. 30, 2021
Credit Loss [Abstract]
Allowance for Credit Losses (“ACL”) on Loans	Allowance for Credit Losses (“ACL”) on Loans On January 1, 2021, the Company adopted the CECL standard, which requires the measurement of expected credit losses for financial assets measured at amortized cost, including loans, and certain off-balance-sheet credit exposures. As a result of the adoption of CECL, the Company recorded a $10.4 million increase to its allowance for credit losses on loans, including $6.8 million related to PCD loans. For PCD loans, the allowance for credit losses recorded is recognized through a gross-up that increases the amortized cost basis of loans with a corresponding increase to the allowance for credit losses, and therefore results in no impact to shareholders' equity. Under the CECL standard, the Company determines the ACL on loans based upon a consideration of its historical portfolio loss experience, current borrower-specific risk characteristics, forecasts of future economic conditions, reversion period, prepayments, and qualitative adjustments. The allowance is measured on a collective (loan segment) basis when similar risk characteristics exist. Loans that do not share common risk characteristics are evaluated on an individual basis and are excluded from the collective evaluation. Accrued interest on loans is excluded from the calculation of the ACL due to the Company's non-accrual policy which results in the reversal of uncollectible accrued interest on non-accrual loans against interest income in a timely manner. Accrued interest receivable on loans held-for-investment totaled $9.5 million at September 30, 2021, and is reported in accrued interest receivable on the consolidated balance sheet. The Company’s loan portfolio segmentation includes: multifamily, commercial real estate, one-to-four family residential mortgage, home equity and lines of credit, commercial and industrial, construction and other consumer loans. Allowance for Collectively Evaluated Loans Held-for-Investment In estimating the quantitative component of the allowance on a collective basis, the Company uses a risk rating migration model which calculates an expected life of loan loss percentage for each loan by generating probability of default and loss given default metrics. The metrics are based on the migration of loans from performing to loss by credit quality rating or delinquency categories using historical life-of-loan analysis periods for each loan portfolio pool, and the severity of loss, based on the aggregate net lifetime losses incurred using the Company's own historical loss experience and comparable peer data loss history. The model's expected losses based on loss history are adjusted for qualitative factors. Among other things, these adjustments include and account for differences in: (i) changes in lending policies and procedures; (ii) changes in local, regional, national, and international economic and business conditions and developments that affect the collectability of our portfolio, including the condition of various market segments; (iii) changes in the experience, ability and depth of lending management and other relevant staff; (iv) changes in the quality of our loan review system; (v) the existence and effect of any concentrations of credit, and changes in the level of such concentrations; and (vi) the effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in our existing portfolio. The Company utilizes a two-year reasonable and supportable forecast period after which estimated losses revert to historical loss experience immediately for the remaining life of the loan. In establishing its estimate of expected credit losses, the Company utilizes five externally-sourced forward-looking economic scenarios developed by Moody's Analytics (“Moody's”). Management utilizes five different Moody's scenarios so as to incorporate uncertainties related to the unprecedented economic environment arising from the COVID-19 pandemic. These scenarios, which range from more benign to more severe economic outlooks, include a ‘most likely outcome’ (the “Baseline” scenario) and four less likely scenarios referred to as the “Upside” and “Downside” scenarios. Each scenario is assigned a weighting with a majority of the weighting placed on the Baseline scenario and lower weights placed on both the Upside and Downside scenarios. The weighting assigned by management is based on the economic outlook and available information at the reporting date. The model projects economic variables under each scenario based on detailed statistical analyses. The Company has identified and selected key variables that most closely correlated to its historical credit performance, which include: Gross domestic product, unemployment, and three collateral indices: the Commercial Property Price Index, the Commercial Property Price Apartment Index and the Case-Shiller Home Price Index. Allowance for Individually Evaluated Loans The Company measures specific reserves for individual loans that do not share common risk characteristics with other loans, consisting of all TDRs and non-accrual loans with an outstanding balance of $500,000 or greater. Loans individually evaluated for impairment are assessed to determine that the loan’s carrying value is not in excess of the estimated fair value of the collateral less cost to sell, if the loan is collateral-dependent, or the present value of the expected future cash flows, if the loan is not collateral-dependent. Management performs an evaluation of each impaired loan and generally obtains updated appraisals as part of the evaluation. In addition, management adjusts estimated fair values down to appropriately consider recent market conditions, our willingness to accept a lower sales price to effect a quick sale, and costs to dispose of any supporting collateral. Determining the estimated fair value of underlying collateral (and related costs to sell) can be difficult in illiquid real estate markets and is subject to significant assumptions and estimates. Management employs an independent third-party management firm that specializes in appraisal preparation and review to ascertain the reasonableness of updated appraisals. Projecting the expected cash flows under troubled debt restructurings which are not collateral-dependent is inherently subjective and requires, among other things, an evaluation of the borrower’s current and projected financial condition. Actual results may be significantly different than our projections and our established allowance for credit losses on these loans, which could have a material effect on our financial results. Individually impaired loans that have no impairment losses are not considered for collective allowances described earlier. At September 30, 2021 and December 31, 2020, the ACL for loans individually evaluated for impairment was $32,000 and $73,000, respectively. Allowance for Credit Losses – Off-Balance Sheet Exposures An ACL for off-balance-sheet exposures represents an estimate of expected credit losses arising from off-balance sheet exposures such as loan commitments, standby letters of credit and unused lines of credit (loans on books already). Commitments to fund unused lines of credit are agreements to lend additional funds to customers as long as there have been no violations of any of the conditions established in the agreements (original or restructured). Commitments to originate loans generally have a fixed expiration or other termination clauses, which may require payment of a fee. Since some of these loan commitments are expected to expire without being drawn upon, total commitments do not necessarily represent future cash requirements. The reserve for off-balance sheet exposures is determined using the CECL reserve factor in the related funded loan segment, adjusted for an average historical funding rate. The allowance for credit losses for off-balance sheet credit exposures is recorded in other liabilities on the consolidated balance sheets and the corresponding provision is included in other non-interest expense. The table below summarizes the allowance for credit losses for off-balance sheet credit exposures (in thousands): Three Months Ended Nine Months Ended Balance at beginning of period $ 1,808 $ 808 Impact of CECL adoption — 737 Balance at beginning of period 1,808 1,545 Provision for credit losses 265 528 Balance at end of period $ 2,073 $ 2,073 The following tables set forth activity in our allowance for credit losses on loans, by loan type, as of, and for the three and nine months ended September 30, 2021, and September 30, 2020 (in thousands): Three Months Ended September 30, 2021 Real Estate Commercial (1) One-to-Four Family Construction and Land Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCD) PCD Total Allowance for credit losses: Beginning balance $ 26,540 $ 4,610 $ 259 $ 663 $ 2,594 $ 7 $ 34,673 $ 4,820 $ 39,493 Charge-offs — — — — (541) (3) (544) — (544) Recoveries — 27 — 25 6 3 61 — 61 Provisions (credit) (297) (230) (69) (46) 542 (1) (101) (47) (148) Ending balance $ 26,243 $ 4,407 $ 190 $ 642 $ 2,601 $ 6 $ 34,089 $ 4,773 $ 38,862 (1) Commercial includes commercial real estate loans collateralized by owner-occupied, non-owner occupied, and multifamily properties. Three Months Ended September 30, 2020 Real Estate Commercial One-to-Four Family Construction and Land Multifamily Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCI) PCI Total Allowance for loan losses: Beginning balance $ 6,699 $ 272 $ 937 $ 27,243 $ 558 $ 1,846 $ 176 $ 37,731 $ 789 $ 38,520 Charge-offs (12) — — — — — — (12) — (12) Recoveries 16 — — — 26 1 — 43 — 43 Provisions (credit) 890 (50) 198 (596) (157) (73) (47) 165 — 165 Ending balance $ 7,593 $ 222 $ 1,135 $ 26,647 $ 427 $ 1,774 $ 129 $ 37,927 $ 789 $ 38,716 Nine Months Ended September 30, 2021 Real Estate Commercial (1) One-to-Four Family Construction and Land Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCD) PCD Total Allowance for credit losses: Beginning balance $ 33,005 $ 207 $ 1,214 $ 260 $ 1,842 $ 198 $ 36,726 $ 881 $ 37,607 Impact of CECL adoption (1,949) 5,233 (921) 419 947 (188) 3,541 6,812 10,353 Balance at January 1, 2021 31,056 5,440 293 679 2,789 10 40,267 7,693 47,960 Charge-offs — (21) — — (553) (3) (577) (2,411) (2,988) Recoveries 19 29 — 26 34 5 113 — 113 Provisions (credit) (4,832) (1,041) (103) (63) 331 (6) (5,714) (509) (6,223) Ending balance $ 26,243 $ 4,407 $ 190 $ 642 $ 2,601 $ 6 $ 34,089 $ 4,773 $ 38,862 (1) Commercial includes commercial real estate loans collateralized by owner-occupied, non-owner occupied, and multifamily properties. Nine Months Ended September 30, 2020 Real Estate Commercial One-to-Four Family Construction and Land Multifamily Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCI) PCI Total Allowance for loan losses: Beginning balance $ 4,891 $ 180 $ 536 $ 20,203 $ 317 $ 1,640 $ 151 $ 27,918 $ 789 $ 28,707 Charge-offs (609) — — — — (94) — (703) — (703) Recoveries 411 — — — 26 6 — 443 — 443 Provisions (credit) 2,900 42 599 6,444 84 222 (22) 10,269 — 10,269 Ending balance $ 7,593 $ 222 $ 1,135 $ 26,647 $ 427 $ 1,774 $ 129 $ 37,927 $ 789 $ 38,716 The following tables detail the amount of loans receivable held-for-investment, net of deferred loan fees and costs, that are evaluated, individually and collectively, for impairment, and the related portion of the allowance for credit losses that is allocated to each loan portfolio segment, at September 30, 2021 and December 31, 2020 (in thousands): September 30, 2021 Real Estate Commercial (1) One-to-Four Family Construction and Land Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCD) PCD Total Allowance for credit losses on loans: Ending balance: individually evaluated for impairment $ 26 $ 3 $ — $ 3 $ — $ — $ 32 $ — $ 32 Ending balance: collectively evaluated for impairment 26,217 4,404 190 639 2,601 6 34,057 4,773 38,830 Loans, net: Ending balance 3,329,651 187,051 26,205 102,023 153,720 2,255 3,800,905 16,054 3,816,959 Ending balance: individually evaluated for impairment 10,091 1,586 — 41 13 — 11,731 — 11,731 Ending balance: collectively evaluated for impairment 3,319,560 185,465 26,205 101,982 80,760 2,255 3,716,227 16,054 3,732,281 PPP loans not evaluated for impairment (2) — — — — 72,947 — 72,947 — 72,947 December 31, 2020 Real Estate Commercial One-to-Four Family Construction and Land Multifamily Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCI) PCI Total Allowance for loan losses: Ending balance: individually evaluated for impairment $ 66 $ — $ — $ — $ 3 $ 4 $ — $ 73 $ — $ 73 Ending balance: collectively evaluated for impairment 5,944 207 1,214 26,995 257 1,838 198 36,653 881 37,534 Loans, net: Ending balance 717,566 212,222 74,351 2,512,934 93,137 191,481 3,029 3,804,720 18,518 3,823,238 Ending balance: individually evaluated for impairment 10,650 1,903 — 626 47 16 — 13,242 — 13,242 Ending balance: collectively evaluated for impairment 706,916 210,319 74,351 2,512,308 93,090 64,930 3,029 3,664,943 18,518 3,683,461 PPP loans not evaluated for impairment (2) — — — — — 126,535 — 126,535 — 126,535 (1) Commercial includes commercial real estate loans collateralized by owner-occupied, non-owner occupied, and multifamily properties. (2) PPP loans are guaranteed by the SBA and therefore excluded from the allowance for credit losses.

Deposits

Deposits	9 Months Ended
	Sep. 30, 2021
Deposits [Abstract]
Deposits	Deposits Deposit account balances are summarized as follows (in thousands): September 30, 2021 December 31, 2020 Non-interest-bearing checking $ 869,008 $ 695,831 NOW and interest-bearing checking 1,056,876 905,208 Savings and money market 1,807,529 1,953,885 Certificates of deposit 407,967 521,627 Total deposits $ 4,141,380 $ 4,076,551 Interest expense on deposit accounts is summarized for the periods indicated (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 NOW and interest-bearing checking, savings, and money market $ 671 $ 2,023 $ 2,448 $ 8,990 Certificates of deposit 749 3,620 2,513 13,405 Total interest expense on deposit accounts $ 1,420 $ 5,643 $ 4,961 $ 22,395

Equity Incentive Plans

Equity Incentive Plans	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Equity Incentive Plans	Equity Incentive Plans The following table is a summary of the Company’s stock options outstanding as of September 30, 2021, and changes therein during the nine months then ended. Number of Stock Options Weighted Average Grant Date Fair Value Weighted Average Exercise Price Weighted Average Contractual Life (years) Outstanding - December 31, 2020 2,214,193 $ 4.01 $ 13.94 3.96 Forfeited (41,090) 3.96 13.62 — Exercised (262,801) 3.93 13.56 — Outstanding - September 30, 2021 1,910,302 4.02 14.00 3.25 Exercisable - September 30, 2021 1,893,223 4.02 13.98 3.25 Expected future stock option expense related to the non-vested options outstanding as of September 30, 2021, is $5,000 over a weighted average period of 0.13 years. On January 29, 2021, the Company granted to directors and employees, under the 2019 Equity Incentive Plan, 147,315 restricted stock units with a total grant-date fair value of $1.8 million. Of these grants, 32,769 vest one year from the date of grant and 114,546 vest in equal installments over a five-year period beginning one year from the date of grant. The Company also issued 29,615 performance-based restricted stock units to its executive officers with a total grant date fair value of $366,041. Vesting of the performance-based restricted stock units will be based on achievement of certain levels of Core Return on Average Assets and will cliff-vest after a three-year measurement period ended January 29, 2024, based on the Company's performance relative to a peer group as determined by the Compensation Committee of the Board. At the end of the performance period, the number of actual shares to be awarded may vary between 0% and 225% of target amounts. The following is a summary of the status of the Company’s restricted stock awards at September 30, 2021, and changes therein during the nine months then ended. Number of Shares Awarded Weighted Average Grant Date Fair Value Non-vested at December 31, 2020 104,010 $ 15.91 Granted 176,930 12.59 Vested (38,470) 15.81 Forfeited (14,138) 13.86 Non-vested at September 30, 2021 228,332 13.48 Expected future stock award expense related to the non-vested restricted share awards as of September 30, 2021, is $2.0 million over a weighted average period of 3.5 years. During the three months ended September 30, 2021 and September 30, 2020, the Company recorded $248,000 and $217,000, respectively, of stock-based compensation related to the above plan. During the nine months ended September 30, 2021 and September 30, 2020, the Company recorded $752,000 and $1.1 million, respectively, of stock-based compensation related to the above plan.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following tables present the assets reported on the consolidated balance sheets at their estimated fair value as of September 30, 2021, and December 31, 2020, by level within the fair value hierarchy as required by the Fair Value Measurements and Disclosures Topic of the FASB ASC. Financial assets and liabilities are classified in their entirety based on the level of input that is significant to the fair value measurement. The fair value hierarchy is as follows: • Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. • Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (for example, interest rates, volatilities, prepayment speeds, loss severities, credit risks and default rates) or inputs that are derived principally from or corroborated by observable market data by correlations or other means. • Level 3 Inputs – Significant unobservable inputs that reflect the Company’s own assumptions that market participants would use in pricing the assets or liabilities. The methods of determining the fair value of assets and liabilities presented in this note are consistent with our methodologies disclosed in Note 15 to the Consolidated Financial Statements of the Company’s 2020 Annual Report on Form 10-K. Fair Value Measurements at September 30, 2021 Using: Carrying Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (in thousands) Measured on a recurring basis: Assets: Investment securities: Debt securities available-for-sale: U.S. Government agency $ 2,327 $ — $ 2,327 $ — Mortgage-backed securities: Pass-through certificates: GSE 363,100 — 363,100 — REMICs: GSE 560,213 — 560,213 — 923,313 — 923,313 — Other debt securities: Municipal bonds 78 — 78 — Corporate bonds 159,093 — 159,093 — 159,171 — 159,171 — Total debt securities available-for-sale 1,084,811 — 1,084,811 — Trading securities 12,761 12,761 — — Equity securities (1) 215 215 — — Total $ 1,097,787 $ 12,976 $ 1,084,811 $ — Measured on a non-recurring basis: Assets: Loans individually evaluated for impairment: Real estate loans: Commercial real estate $ 3,745 $ — $ — $ 3,745 One-to-four family residential mortgage 488 — — 488 Multifamily 6 — — 6 Home equity and lines of credit 28 — — 28 Total individually evaluated real estate loans 4,267 — — 4,267 Commercial and industrial loans 13 — — 13 Other real estate owned 100 — — 100 Total $ 4,380 $ — $ — $ 4,380 (1) Excludes investment measured at net asset value of $5.0 million at September 30, 2021, which has not been classified in the fair value hierarchy. Fair Value Measurements at December 31, 2020 Using: Carrying Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (in thousands) Measured on a recurring basis: Assets: Investment securities: Debt securities available-for-sale: U.S. Government agency securities $ 3,158 $ — $ 3,158 $ — Mortgage-backed securities: Pass-through certificates: GSE 281,343 — 281,343 — REMICs: GSE 890,965 — 890,965 — Non-GSE 4 — 4 — 1,172,312 — 1,172,312 — Other debt securities: Municipal bonds 123 — 123 — Corporate bonds 88,418 — 88,418 — Asset-backed securities 794 — 794 — 89,335 — 89,335 — Total debt securities available-for-sale 1,264,805 — 1,264,805 — Trading securities 12,291 12,291 — — Equity securities 253 253 — — Total $ 1,277,349 $ 12,544 $ 1,264,805 $ — Measured on a non-recurring basis: Assets: Impaired loans: Real estate loans: Commercial real estate $ 5,268 $ — $ — $ 5,268 Multifamily 16 — — 16 Home equity and lines of credit 28 — — 28 Total impaired real estate loans 5,312 — — 5,312 Commercial and industrial loans 13 — — 13 Total $ 5,325 $ — $ — $ 5,325 The following table presents qualitative information for Level 3 assets measured at fair value on a non-recurring basis at September 30, 2021 and December 31, 2020 (dollars in thousands): Fair Value Valuation Methodology Unobservable Range of Inputs September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Individually evaluated loans $ 4,280 $ 5,325 Appraisals Discount for costs to sell 7.0% 7.0% Discount for quick sale 10.0% 10.0% Discounted cash flows Interest rates 4.88% to 6.25% 4.88% to 6.25% Other real estate owned 100 — Appraisals Discount for costs to sell 7.0% N/A The valuation techniques described below were used to measure fair value of financial instruments in the tables below on a recurring basis and a non-recurring basis at September 30, 2021, and December 31, 2020. Debt Securities Available for Sale: The estimated fair values for mortgage-backed securities, corporate, and other debt securities are obtained from an independent nationally recognized third-party pricing service. The estimated fair values are derived primarily from cash flow models, which include assumptions for interest rates, credit losses, and prepayment speeds. Broker/dealer quotes are utilized as well, when such quotes are available and deemed representative of the market. The significant inputs utilized in the cash flow models are based on market data obtained from sources independent of the Company (Observable Inputs), and are therefore classified as Level 2 within the fair value hierarchy. There were no transfers of securities between Level 1 and Level 2 during the nine months ended September 30, 2021 or September 30, 2020. Trading Securities: Fair values are derived from quoted market prices in active markets. The assets consist of publicly traded mutual funds. Equity Securities: Fair values of equity securities consisting of publicly traded mutual funds are derived from quoted market prices in active markets. Loans individually evaluated for impairment: At September 30, 2021 and December 31, 2020, the Company had loans individually evaluated for impairment (excluding PCD/PCI loans) with outstanding principal balances of $6.3 million and $7.4 million, respectively, which were recorded at their estimated fair value of $4.3 million and $5.3 million, respectively. The Company recorded a net decrease in the specific reserve for impaired loans of $42,000 and a net increase of $166,000 for the nine months ended September 30, 2021 and September 30, 2020, respectively. Net charge-offs of $2.9 million and $260,000 were recorded for the nine months ended September 30, 2021 and September 30, 2020, respectively, utilizing Level 3 inputs. For purposes of estimating the fair value of impaired loans, management utilizes independent appraisals, if the loan is collateral-dependent, adjusted downward by management, as necessary, for changes in relevant valuation factors subsequent to the appraisal date, or the present value of expected future cash flows for non-collateral dependent loans and TDRs. Other Real Estate Owned: At September 30, 2021, the Company had assets acquired through foreclosure of $100,000, recorded at estimated fair value, less estimated selling costs when acquired, thus establishing a new cost basis. Estimated fair value is generally based on independent appraisals. These appraisals include adjustments to comparable assets based on the appraisers’ market knowledge and experience, and are considered Level 3 inputs. When an asset is acquired, the excess of the loan balance over fair value, less estimated selling costs, is charged to the allowance for credit losses. If the estimated fair value of the asset declines, a write-down is recorded through non-interest expense. The valuation of foreclosed assets is subjective in nature and may be adjusted in the future because of changes in the economic conditions. In addition, the Company may be required, from time to time, to measure the fair value of certain other financial assets on a nonrecurring basis in accordance with U.S. GAAP. The adjustments to fair value usually result from the application of lower-of-cost-or-market accounting or write downs of individual assets. Fair Value of Financial Instruments: The FASB ASC Topic for Financial Instruments requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring or non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above. The following methods and assumptions were used to estimate the fair value of other financial assets and financial liabilities not already discussed above: (a) Cash and Cash Equivalents Cash and cash equivalents are short-term in nature with original maturities of three months or less; the carrying amount approximates fair value. Certificates of deposit having original terms of six-months or less; the carrying value generally approximates fair value. Certificates of deposit with an original maturity of six months or greater; the fair value is derived from discounted cash flows. (b) Debt Securities (Held-to-Maturity) The estimated fair values for substantially all of our securities are obtained from an independent nationally recognized pricing service. The independent pricing service utilizes market prices of same or similar securities whenever such prices are available. Prices involving distressed sellers are not utilized in determining fair value. Where necessary, the independent third-party pricing service estimates fair value using models employing techniques such as discounted cash flow analysis. The assumptions used in these models typically include assumptions for interest rates, credit losses, and prepayments, utilizing market observable data where available. (c) Investments in Equity Securities at Net Asset Value Per Share The Company uses net asset value as a practical expedient to record its investment in a private SBA Loan Fund since the shares in the fund are not publicly traded, do not have a readily determinable fair value and the net asset value per share is calculated in a manner consistent with the measurement principles of an investment company. (d) Federal Home Loan Bank of New York Stock The fair value for Federal Home Loan Bank of New York ("FHLBNY") stock is its carrying value, since this is the amount for which it could be redeemed and there is no active market for this stock. (e) Loans (Held-for-Investment) Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as originated and purchased, and further segregated by residential mortgage, construction, land, multifamily, commercial and consumer. Each loan category is further segmented into amortizing and non-amortizing and fixed and adjustable rate interest terms and by performing and nonperforming categories. The fair value of loans is estimated using a discounted cash flow analysis. The discount rates used to determine fair value use interest rate spreads that reflect factors such as liquidity, credit, and nonperformance risk of the loans. (f) Loans (Held-for-Sale) Held-for-sale loans are carried at the lower of aggregate cost or estimated fair value, less costs to sell, and therefore fair value is equal to carrying value. (g) Deposits The fair value of deposits with no stated maturity, such as non-interest bearing demand deposits, savings, NOW and money market accounts, is equal to the amount payable on demand. The fair value of certificates of deposit is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities. (h) Commitments to Extend Credit and Standby Letters of Credit The fair value of commitments to extend credit and standby letters of credit is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties. For fixed-rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value of off-balance sheet commitments is insignificant and therefore not included in the following table. (i) Borrowings The fair value of borrowed funds is estimated by discounting future cash flows based on rates currently available for debt with similar terms and remaining maturity. (j) Advance Payments by Borrowers for Taxes and Insurance Advance payments by borrowers for taxes and insurance have no stated maturity; the fair value is equal to the amount currently payable. (k) Derivatives The fair value of the Company's derivatives is determined using discounted cash flow analysis using observable market-based inputs, which are considered Level 2 inputs. The estimated fair value of the Company’s financial instruments at September 30, 2021 and December 31, 2020, is presented in the following tables (in thousands): September 30, 2021 Estimated Fair Value Carrying Value Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 173,694 $ 173,694 $ — $ — $ 173,694 Trading securities 12,761 12,761 — — 12,761 Debt securities available-for-sale 1,084,811 — 1,084,811 — 1,084,811 Debt securities held-to-maturity 5,811 — 6,083 — 6,083 Equity securities (1) 215 215 — — 215 FHLBNY stock, at cost 22,336 — 22,336 — 22,336 Net loans held-for-investment 3,778,097 — — 3,893,911 3,893,911 Derivative assets 865 — 865 — 865 Financial liabilities: Deposits $ 4,141,380 $ — $ 4,144,981 $ — $ 4,144,981 Borrowed funds 421,804 — 430,730 — 430,730 Advance payments by borrowers for taxes and insurance 23,496 — 23,496 — 23,496 Derivative liabilities 867 — 867 — 867 (1) Excludes investment measured at net asset value of $5.0 million at September 30, 2021, which has not been classified in the fair value hierarchy. December 31, 2020 Estimated Fair Value Carrying Value Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 87,544 $ 87,544 $ — $ — $ 87,544 Trading securities 12,291 12,291 — — 12,291 Debt securities available-for-sale 1,264,805 — 1,264,805 — 1,264,805 Debt securities held-to-maturity 7,234 — 7,574 — 7,574 Equity securities 253 253 — — 253 FHLBNY stock, at cost 28,641 — 28,641 — 28,641 Loans held-for-sale 19,895 — — 19,895 19,895 Net loans held-for-investment 3,785,631 — — 3,842,054 3,842,054 Derivative assets 1,498 — 1,498 — 1,498 Financial liabilities: Deposits $ 4,076,551 $ — $ 4,082,538 $ — $ 4,082,538 Borrowed funds 591,789 — 609,900 — 609,900 Advance payments by borrowers for taxes and insurance 19,677 — 19,677 — 19,677 Derivative liabilities 1,502 — 1,502 — 1,502 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 no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected losses, 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. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates.

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 is computed by dividing net income available to common stockholders by the weighted average number of shares outstanding during the period. For purposes of calculating basic earnings per share, weighted average common shares outstanding excludes unallocated employee stock ownership plan (“ESOP”) shares that have not been committed for release and unvested restricted stock. Diluted earnings per share is computed using the same method as basic earnings per share, but reflects the potential dilution that could occur if stock options were exercised and converted into common stock and unvested shares of restricted stock vested. These potentially dilutive shares would then be included in the weighted average number of shares outstanding for the period using the treasury stock method. When applying the treasury stock method we added the assumed proceeds from option exercises and the average unamortized compensation costs related to unvested shares of restricted stock and stock options. We then divided this sum by our average stock price for the period to calculate assumed shares repurchased. The excess of the number of shares issuable over the number of shares assumed to be repurchased is added to basic weighted average common shares to calculate diluted earnings per share. The following is a summary of the Company’s earnings per share calculations and reconciliation of basic to diluted earnings per share for the periods indicated (in thousands, except per share data): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net income available to common stockholders $ 16,080 $ 8,582 $ 54,551 $ 23,926 Weighted average shares outstanding-basic 48,095,473 50,707,691 48,838,396 48,131,005 Effect of non-vested restricted stock and stock options outstanding 390,623 12,112 298,641 79,276 Weighted average shares outstanding-diluted 48,486,096 50,719,803 49,137,037 48,210,281 Earnings per share-basic $ 0.33 $ 0.17 $ 1.12 $ 0.50 Earnings per share-diluted $ 0.33 $ 0.17 $ 1.11 $ 0.50 Anti-dilutive shares 125,744 2,287,010 417,955 1,868,511

Leases

Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases	Leases The Company’s leases primarily relate to real estate property for branches and office space with terms extending from three months up to 33.75 years. At September 30, 2021, all of the Company's leases are classified as operating leases, which are required to be recognized on the consolidated balance sheets as a right-of-use asset and a corresponding lease liability. The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use assets and operating lease liabilities on the consolidated balance sheets. Right-of-use assets represent the right to use an underlying asset for the lease term and lease liabilities represent the obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recorded at the present value of lease payments over the lease term. As the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate, at lease inception, over a similar term in determining the present value of lease payments. Certain leases include options to renew, with one or more renewal terms ranging from five At September 30, 2021, the Company’s operating lease right-of-use assets and operating lease liabilities included on the consolidated balance sheet were $35.1 million and $41.1 million, respectively. At December 31, 2020, the Company’s operating lease right-of-use assets and operating lease liabilities included on the consolidated balance sheet were $36.7 million and $42.7 million, respectively. 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 on the consolidated statements of comprehensive income. Supplemental lease information at or for the nine months ended September 30, 2021, and September 30, 2020 is as follows (dollars in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Operating lease cost $ 1,409 $ 2,073 $ 4,317 $ 4,935 Variable lease cost 974 878 3,219 2,378 Net lease cost $ 2,383 $ 2,951 $ 7,536 $ 7,313 Cash paid for amounts included in measurement of operating lease liabilities $ 1,568 $ 2,111 $ 4,967 $ 5,180 Right-of-use assets obtained in exchange for new operating lease liabilities $ 1,596 $ — $ 1,596 $ 3,028 Weighted average remaining lease term 11.89 years 12.39 years Weighted average discount rate 3.55 % 3.55 % The following table summarizes lease payment obligations for each of the next five years and thereafter in addition to a reconcilement to the Company's current lease liability (in thousands): Year Amount 2021 $ 1,571 2022 5,923 2023 5,802 2024 5,372 2025 5,024 Thereafter 28,382 Total lease payments 52,074 Less: imputed interest 10,984 Present value of lease liabilities $ 41,090

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The Company records revenue from contracts with customers in accordance with ASU 2014-09, Revenue from Contracts with Customers (“Topic 606”) . The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities, which comprise the majority of the Company’s revenue. The Company’s revenue streams that are within the scope of Topic 606 include service charges on deposit accounts, ATM and card interchange fees, investment services fees, and other miscellaneous income. Fees and service charges for customer services include: (i) service charges on deposit accounts, including account maintenance fees, overdraft fees, insufficient funds fees, wire fees, and other deposit related fees; (ii) ATM and card interchange fees, which include fees generated when a Bank cardholder uses a non-Bank ATM or a non-Bank cardholder uses a Bank ATM, and fees earned whenever the Bank's debit cards are processed through card payment networks such as Visa; and (iii) investment services fees earned through partnering with a third-party investment and brokerage service firm to provide insurance and investment products to customers. The Company's performance obligation for fees and service charges is satisfied and related revenue recognized immediately or in the month of performance of services. For the three and nine months ended September 30, 2021 and 2020, other income primarily includes rental income from subleasing one of the Company's branches to a third party and loan servicing fees. Other income is recognized at the time the transaction occurs. The following table summarizes non-interest income for the periods indicated (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Fees and service charges for customer services: Service charges $ 763 $ 565 $ 2,173 $ 1,674 ATM and card interchange fees 515 351 1,397 930 Investment fees 92 93 324 191 Total fees and service charges for customer services 1,370 1,009 3,894 2,795 Income on bank-owned life insurance (1) 862 894 2,567 2,635 Gains on available-for-sale debt securities, net (1) 370 45 976 105 (Losses)/gains on trading securities, net (1) (75) 763 1,096 397 Gains on sales of loans (1) — — 1,401 665 Swap income (1) — 307 — 691 Other 101 4 246 81 Total non-interest income $ 2,628 $ 3,022 $ 10,180 $ 7,369 (1) Not in scope of Topic 606

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives The Company has interest rate derivatives resulting from a service provided to certain qualified borrowers in a loan-related transaction and, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. The interest rate swap agreement which the Company executes with the commercial borrower is collateralized by the borrower’s commercial real estate financed by the Company. The collateral exceeds the maximum potential amount of future payments under the credit derivative. As these interest rate swaps do not meet the hedge accounting requirements, changes in the fair value of both the customer swaps and the offsetting swaps are recognized directly in earnings. At September 30, 2021, the Company had seven interest rate swaps with a notional amount of $38.4 million. At December 31, 2020, the Company had seven interest rate swaps with a notional amount of $39.2 million. For both the three and nine months ended September 30, 2021, the Company recorded net fee income of $0. For the three and nine months ended September 30, 2020, the Company recorded net fee income of $307,000 and $691,000, respectively. The table below presents the fair value of the derivatives as well as their location on the consolidated balance sheets (in thousands): Fair Value Balance Sheet Location September 30, 2021 December 31, 2020 Other assets $ 865 $ 1,498 Other liabilities 867 1,502

Recent Accounting Pronouncement

Recent Accounting Pronouncements Adopted	9 Months Ended
	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements Adopted	Recent Accounting Pronouncements Adopted ASU No. 2016-13. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): “Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”). This guidance was subsequently amended by ASU No. 2019-04, “Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments”; ASU No. 2019-05, “Financial Instruments-Credit Losses (Topic 326): Targeted Transition Relief”; and ASU No. 2019-11, “Codification Improvements to Topic 326, Financial Instruments-Credit Losses”. ASU No. 2016-13 and its subsequent updates are collectively known as “CECL”. CECL replaces the current incurred loss impairment model that recognizes losses when a probable threshold is met with a requirement to recognize lifetime expected credit losses immediately when a financial asset is originated or purchased. For available-for-sale debt securities where fair value is less than cost, credit-related impairment would be recognized in an allowance for credit losses and adjusted in each subsequent period for changes in credit risk. CECL also expands the disclosure requirements regarding an entity’s assumptions, models, and methods for estimating the allowance for credit losses. ASU 2016-13 and its related amendments were initially effective for financial statements for fiscal years and interim periods beginning after December 15, 2019. The Company elected to defer the adoption of the CECL methodology permitted by the CARES Act, signed into law on March 27, 2020, which provided financial institutions with the option to defer adoption of ASU 2016-13 until the earlier of the end of the pandemic or December 31, 2020. This relief was further extended by the Consolidations Appropriations Act enacted on December 27, 2020, to the earlier of the first day of an entity's fiscal year after the date the national emergency terminates or January 1, 2022. The Company adopted ASU 2016-13 and its related amendments on January 1, 2021, using a modified retrospective approach. Our implementation process included: assessment and documentation of governance and reporting processes and related internal controls; model development, documentation and validation; and the incorporation of qualitative adjustments for model limitations, among other things. ASU 2016-13 lists several credit loss methods that are acceptable such as a discounted cash flow method, loss-rate method and probability of default/loss given default (“PD/LGD”) method. The Company utilizes the PD/LGD methodology to estimate its allowance for credit losses. At adoption, the Company recorded an $11.1 million increase to its allowance for credit losses, including reserves of $10.4 million related to loans and $737,000 related to unfunded credit commitments. Of the $10.4 million increase in loan reserves, $6.8 million represents PCD loan-related reserves which were recognized through a gross-up that increases the amortized cost basis of loans with a corresponding increase to the allowance for credit losses, and therefore results in no impact to shareholders' equity. The non-PCD loan related increase to the allowance for credit losses of $4.3 million, including the reserves for unfunded loan commitments, was offset in shareholders' equity and deferred tax assets. For further details on the adoption of CECL see Note 6 - Loans Note 7 - Allowance for Credit Losses on Loans ASU No. 2019-12. In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” ASU No. 2019-12 simplifies accounting for income taxes by removing specific technical exceptions in ASC 740 related to the incremental approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period and the recognition for deferred tax liabilities for outside basis differences. ASU No. 2019-12 also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. The amendments in this update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The Company adopted ASU 2019-12 on January 1, 2021, which did not have a material impact on the Company's financial condition or results of operations.

Consolidated Financial Statem_2

Consolidated Financial Statements (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The consolidated financial statements are comprised of the accounts of Northfield Bancorp, Inc. (and its wholly owned subsidiaries, Northfield Investments, Inc. and Northfield Bank (the “ Bank ” ), and the Bank’s wholly-owned subsidiaries, NSB Services Corp. and NSB Realty Trust, collectively the “ Company ” ). All significant intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting solely of normal and recurring adjustments) necessary for the fair presentation of the consolidated balance sheets and the consolidated statements of comprehensive income for the unaudited periods presented have been included. The results of operations and other data presented for the three and nine months ended September 30, 2021 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2021 or for any other period. Whenever necessary, certain prior year amounts are reclassified to conform to the current year presentation. In preparing the unaudited consolidated financial statements in conformity with U.S. generally accepted accounting principles ( “ U.S. GAAP ” ), management has made estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated balance sheets and for the periods indicated in the consolidated statements of comprehensive income. Material estimates that are particularly susceptible to change are: the allowance for credit losses, estimated cash flows of our purchased credit-deteriorated (“PCD”, or, previously, purchased credit-impaired “PCI”) loans and the valuation allowance against deferred tax assets. Estimates and assumptions are reviewed periodically and the effects of revisions are reflected in the consolidated financial statements in the period they are deemed necessary. While management uses its best judgment, actual amounts or results could differ significantly from those estimates. Certain information and note disclosures usually included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission ( “ SEC ”
Loans and Allowance for Credit Losses	On January 1, 2021, the Company adopted ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): “Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”) which replaces the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss (“CECL”) methodology. The Company used the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. The adoption of the new standard resulted in the Company recording an increase in the allowance for credit losses of $11.1 million, comprised of $10.4 million and $737,000 for loans and unfunded commitments, respectively, including $6.8 million related to PCD loans. For PCD loans, the allowance for credit losses recorded is recognized through a gross-up that increases the amortized cost basis of loans with a corresponding increase to the allowance for credit losses, and therefore results in no impact to shareholders' equity. The remaining increase to the allowance for credit losses of $4.3 million was offset in stockholders' equity and deferred taxes. As a result of adopting CECL, the Company's prior distinction between the originated loan portfolio and the non-PCD acquired loan portfolio is no longer necessary. Results for reporting periods beginning after January 1, 2021 are presented under CECL, while prior period amounts continue to be recorded with previously applicable U.S. GAAP. Further information regarding the impact of CECL can be found in Note 6 - Loans Note 7 – Allowance for Credit Losses on Loans Note 15 - Recent Accounting Pronouncements Adopted
Fair Value Measurements	The following tables present the assets reported on the consolidated balance sheets at their estimated fair value as of September 30, 2021, and December 31, 2020, by level within the fair value hierarchy as required by the Fair Value Measurements and Disclosures Topic of the FASB ASC. Financial assets and liabilities are classified in their entirety based on the level of input that is significant to the fair value measurement. The fair value hierarchy is as follows: • Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. • Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (for example, interest rates, volatilities, prepayment speeds, loss severities, credit risks and default rates) or inputs that are derived principally from or corroborated by observable market data by correlations or other means. • Level 3 Inputs – Significant unobservable inputs that reflect the Company’s own assumptions that market participants would use in pricing the assets or liabilities.
Fair Value of Financial Instruments	The FASB ASC Topic for Financial Instruments requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring or non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above. The following methods and assumptions were used to estimate the fair value of other financial assets and financial liabilities not already discussed above: (a) Cash and Cash Equivalents Cash and cash equivalents are short-term in nature with original maturities of three months or less; the carrying amount approximates fair value. Certificates of deposit having original terms of six-months or less; the carrying value generally approximates fair value. Certificates of deposit with an original maturity of six months or greater; the fair value is derived from discounted cash flows. (b) Debt Securities (Held-to-Maturity) The estimated fair values for substantially all of our securities are obtained from an independent nationally recognized pricing service. The independent pricing service utilizes market prices of same or similar securities whenever such prices are available. Prices involving distressed sellers are not utilized in determining fair value. Where necessary, the independent third-party pricing service estimates fair value using models employing techniques such as discounted cash flow analysis. The assumptions used in these models typically include assumptions for interest rates, credit losses, and prepayments, utilizing market observable data where available. (c) Investments in Equity Securities at Net Asset Value Per Share The Company uses net asset value as a practical expedient to record its investment in a private SBA Loan Fund since the shares in the fund are not publicly traded, do not have a readily determinable fair value and the net asset value per share is calculated in a manner consistent with the measurement principles of an investment company. (d) Federal Home Loan Bank of New York Stock The fair value for Federal Home Loan Bank of New York ("FHLBNY") stock is its carrying value, since this is the amount for which it could be redeemed and there is no active market for this stock. (e) Loans (Held-for-Investment) Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as originated and purchased, and further segregated by residential mortgage, construction, land, multifamily, commercial and consumer. Each loan category is further segmented into amortizing and non-amortizing and fixed and adjustable rate interest terms and by performing and nonperforming categories. The fair value of loans is estimated using a discounted cash flow analysis. The discount rates used to determine fair value use interest rate spreads that reflect factors such as liquidity, credit, and nonperformance risk of the loans. (f) Loans (Held-for-Sale) Held-for-sale loans are carried at the lower of aggregate cost or estimated fair value, less costs to sell, and therefore fair value is equal to carrying value. (g) Deposits The fair value of deposits with no stated maturity, such as non-interest bearing demand deposits, savings, NOW and money market accounts, is equal to the amount payable on demand. The fair value of certificates of deposit is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities. (h) Commitments to Extend Credit and Standby Letters of Credit The fair value of commitments to extend credit and standby letters of credit is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties. For fixed-rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value of off-balance sheet commitments is insignificant and therefore not included in the following table. (i) Borrowings The fair value of borrowed funds is estimated by discounting future cash flows based on rates currently available for debt with similar terms and remaining maturity. (j) Advance Payments by Borrowers for Taxes and Insurance Advance payments by borrowers for taxes and insurance have no stated maturity; the fair value is equal to the amount currently payable. (k) 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.
Earnings Per Share	Basic earnings per share is computed by dividing net income available to common stockholders by the weighted average number of shares outstanding during the period. For purposes of calculating basic earnings per share, weighted average common shares outstanding excludes unallocated employee stock ownership plan (“ESOP”) shares that have not been committed for release and unvested restricted stock.Diluted earnings per share is computed using the same method as basic earnings per share, but reflects the potential dilution that could occur if stock options were exercised and converted into common stock and unvested shares of restricted stock vested. These potentially dilutive shares would then be included in the weighted average number of shares outstanding for the period using the treasury stock method. When applying the treasury stock method we added the assumed proceeds from option exercises and the average unamortized compensation costs related to unvested shares of restricted stock and stock options. We then divided this sum by our average stock price for the period to calculate assumed shares repurchased. The excess of the number of shares issuable over the number of shares assumed to be repurchased is added to basic weighted average common shares to calculate diluted earnings per share.
Recently Issued and Adopted Accounting Pronouncements	ASU No. 2016-13. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): “Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”). This guidance was subsequently amended by ASU No. 2019-04, “Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments”; ASU No. 2019-05, “Financial Instruments-Credit Losses (Topic 326): Targeted Transition Relief”; and ASU No. 2019-11, “Codification Improvements to Topic 326, Financial Instruments-Credit Losses”. ASU No. 2016-13 and its subsequent updates are collectively known as “CECL”. CECL replaces the current incurred loss impairment model that recognizes losses when a probable threshold is met with a requirement to recognize lifetime expected credit losses immediately when a financial asset is originated or purchased. For available-for-sale debt securities where fair value is less than cost, credit-related impairment would be recognized in an allowance for credit losses and adjusted in each subsequent period for changes in credit risk. CECL also expands the disclosure requirements regarding an entity’s assumptions, models, and methods for estimating the allowance for credit losses. ASU 2016-13 and its related amendments were initially effective for financial statements for fiscal years and interim periods beginning after December 15, 2019. The Company elected to defer the adoption of the CECL methodology permitted by the CARES Act, signed into law on March 27, 2020, which provided financial institutions with the option to defer adoption of ASU 2016-13 until the earlier of the end of the pandemic or December 31, 2020. This relief was further extended by the Consolidations Appropriations Act enacted on December 27, 2020, to the earlier of the first day of an entity's fiscal year after the date the national emergency terminates or January 1, 2022. The Company adopted ASU 2016-13 and its related amendments on January 1, 2021, using a modified retrospective approach. Our implementation process included: assessment and documentation of governance and reporting processes and related internal controls; model development, documentation and validation; and the incorporation of qualitative adjustments for model limitations, among other things. ASU 2016-13 lists several credit loss methods that are acceptable such as a discounted cash flow method, loss-rate method and probability of default/loss given default (“PD/LGD”) method. The Company utilizes the PD/LGD methodology to estimate its allowance for credit losses. At adoption, the Company recorded an $11.1 million increase to its allowance for credit losses, including reserves of $10.4 million related to loans and $737,000 related to unfunded credit commitments. Of the $10.4 million increase in loan reserves, $6.8 million represents PCD loan-related reserves which were recognized through a gross-up that increases the amortized cost basis of loans with a corresponding increase to the allowance for credit losses, and therefore results in no impact to shareholders' equity. The non-PCD loan related increase to the allowance for credit losses of $4.3 million, including the reserves for unfunded loan commitments, was offset in shareholders' equity and deferred tax assets. For further details on the adoption of CECL see Note 6 - Loans Note 7 - Allowance for Credit Losses on Loans ASU No. 2019-12. In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” ASU No. 2019-12 simplifies accounting for income taxes by removing specific technical exceptions in ASC 740 related to the incremental approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period and the recognition for deferred tax liabilities for outside basis differences. ASU No. 2019-12 also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. The amendments in this update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The Company adopted ASU 2019-12 on January 1, 2021, which did not have a material impact on the Company's financial condition or results of operations.

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Schedule of Business Acquisitions, by Acquisition	The following table summarizes the estimated fair values of the assets acquired and the liabilities assumed at the date of acquisition for Victory (in thousands): July 1, 2020 Fair Value Total Purchase Price $ 41,173 Assets acquired: Cash and cash equivalents $ 72,875 Debt securities available for sale 126,931 Loans 180,431 Accrued interest receivable 1,415 Bank-owned life insurance 5,714 Premises and equipment 7,789 Other assets 5,010 Total assets acquired 400,165 Liabilities assumed: Deposits 354,592 Other liabilities 7,001 Total liabilities assumed 361,593 Net assets acquired $ 38,572 Goodwill recorded in the merger $ 2,601
Schedule of Credit Impaired Loans Acquired in Acquisition	The following is a summary of the credit impaired loans acquired in the Victory acquisition as of the closing date (in thousands): July 1, 2020 Contractually required principal and interest $ 7,809 Contractual cash flows not expected to be collected (non-accretable discount) 3,315 Expected cash flows to be collected at acquisition 4,494 Interest component of expected cash flows (accretable yield) (599) Fair value of acquired loans $ 3,895

Debt Securities Available-for_2

Debt Securities Available-for-Sale (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Comparative Summary of Mortgage-Backed Securities and Other Securities Available-for-Sale	The following is a comparative summary of mortgage-backed and other debt securities available-for-sale at September 30, 2021, and December 31, 2020 (in thousands): September 30, 2021 Gross Gross Estimated Amortized unrealized unrealized fair cost gains losses value U.S. Government agency securities $ 2,344 $ — $ (17) $ 2,327 Mortgage-backed securities: Pass-through certificates: Government sponsored enterprises ("GSEs") 356,687 7,341 (928) 363,100 Real estate mortgage investment conduits ("REMICs"): GSE 556,639 4,406 (832) 560,213 913,326 11,747 (1,760) 923,313 Other debt securities: Municipal bonds 77 1 — 78 Corporate bonds 158,608 579 (94) 159,093 158,685 580 (94) 159,171 Total debt securities available-for-sale $ 1,074,355 $ 12,327 $ (1,871) $ 1,084,811 December 31, 2020 Gross Gross Estimated Amortized unrealized unrealized fair cost gains losses value U.S. Government agency securities $ 3,168 $ — $ (10) $ 3,158 Mortgage-backed securities: Pass-through certificates: GSE 270,867 10,720 (244) 281,343 REMICs: GSE 884,414 7,027 (476) 890,965 Non-GSE 4 — — 4 1,155,285 17,747 (720) 1,172,312 Other debt securities: Municipal bonds 122 1 — 123 Corporate bonds 87,319 1,099 — 88,418 Asset-backed securities 779 15 — 794 88,220 1,115 — 89,335 Total debt securities available-for-sale $ 1,246,673 $ 18,862 $ (730) $ 1,264,805
Summary of Expected Maturity Distribution of Debt Securities Available-for-Sale, Other Than Mortgage-Backed Securities	The following is a summary of the expected maturity distribution of debt securities available-for-sale, other than mortgage-backed securities, at September 30, 2021 (in thousands): Available-for-sale Amortized cost Estimated fair value Due in one year or less $ 45,327 $ 45,587 Due after one year through five years 98,348 98,631 Due after five years through ten years 17,354 17,280 $ 161,029 $ 161,498
Gross Unrealized Losses on Mortgage-Backed Securities	Gross unrealized losses on mortgage-backed and other debt securities available-for-sale, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2021, and December 31, 2020, were as follows (in thousands): September 30, 2021 Less than 12 months 12 months or more Total Unrealized Estimated Unrealized Estimated Unrealized Estimated losses fair value losses fair value losses fair value U.S. Government agency securities $ (17) $ 2,327 $ — $ — $ (17) $ 2,327 Mortgage-backed securities: Pass-through certificates: GSE (684) 151,998 (244) 15,056 (928) 167,054 REMICs: GSE (783) 126,493 (49) 4,049 (832) 130,542 Other debt securities: Corporate bonds (94) 49,905 — — (94) 49,905 Total $ (1,578) $ 330,723 $ (293) $ 19,105 $ (1,871) $ 349,828 December 31, 2020 Less than 12 months 12 months or more Total Unrealized Estimated Unrealized Estimated Unrealized Estimated losses fair value losses fair value losses fair value U.S. Government agency securities $ (10) $ 3,158 $ — $ — $ (10) $ 3,158 Mortgage-backed securities: Pass-through certificates: GSE (233) 28,419 (11) 459 (244) 28,878 REMICs: GSE (476) 210,569 — — (476) 210,569 Total $ (719) $ 242,146 $ (11) $ 459 $ (730) $ 242,605

Debt Securities Held-to-Matur_2

Debt Securities Held-to-Maturity (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Securities Held-to-Maturity	The following is a summary of mortgage-backed securities held-to-maturity at September 30, 2021 and December 31, 2020 (in thousands): September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Mortgage-backed securities: Pass-through certificates: GSE $ 5,811 $ 272 $ — $ 6,083 Total securities held-to-maturity $ 5,811 $ 272 $ — $ 6,083 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Mortgage-backed securities: Pass-through certificates: GSE $ 7,234 $ 340 $ — $ 7,574 Total securities held-to-maturity $ 7,234 $ 340 $ — $ 7,574

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Net Loans Held-for-Investment	The following table summarizes the Company’s loans held-for-investment (in thousands): September 30, December 31, 2021 2020 Real estate loans: Multifamily $ 2,546,296 $ 2,509,310 Commercial mortgage 783,355 716,973 One-to-four family residential mortgage 187,051 210,817 Home equity and lines of credit 102,023 91,126 Construction and land 26,205 74,318 Total real estate loans 3,644,930 3,602,544 Commercial and industrial loans (1) 153,720 194,352 Other loans 2,255 3,029 Total commercial and industrial and other loans 155,975 197,381 Deferred origination loan costs, net (2) — 4,795 Loans held-for-investment, net (excluding PCD/PCI) 3,800,905 3,804,720 PCD/PCI loans 16,054 18,518 Total Loans held-for-investment, net 3,816,959 3,823,238 Allowance for credit losses (38,862) (37,607) Net loans held-for-investment $ 3,778,097 $ 3,785,631 (1) Included in commercial and industrial loans at September 30, 2021 and December 31, 2020 are PPP loans totaling $72.9 million and $126.5 million, respectively.
Schedule of Loans Held-for-Investment, Excluding PCD Loans, Net of Deferred Fees and Costs	The following table presents the Company’s loans held-for-investment, excluding PCD loans, by loan class, credit risk ratings and year of origination, at September 30, 2021 (in thousands): September 30, 2021 2021 2020 2019 2018 2017 Prior Revolving Loans Total Real Estate: Multifamily Pass $ 531,300 $ 545,674 $ 355,399 $ 276,368 $ 244,623 $ 575,489 $ 489 $ 2,529,342 Special Mention — — — — — 429 — 429 Substandard — — 4,660 3,803 — 8,062 — 16,525 Total multifamily 531,300 545,674 360,059 280,171 244,623 583,980 489 2,546,296 Commercial Pass 89,850 73,551 98,944 100,274 67,806 288,266 36,596 755,287 Special Mention — — 508 — 500 4,742 — 5,750 Substandard — — 7,884 — 2,372 8,718 3,344 22,318 Total commercial 89,850 73,551 107,336 100,274 70,678 301,726 39,940 783,355 One-to-four family residential Pass 4,784 9,342 12,089 13,530 12,359 128,149 603 180,856 Special Mention — — 529 — — 2,368 — 2,897 Substandard — — 524 — — 2,774 — 3,298 Total one-to-four family residential 4,784 9,342 13,142 13,530 12,359 133,291 603 187,051 Construction and land Pass — 1,556 1,377 525 2,068 3,523 17,156 26,205 Total construction and land — 1,556 1,377 525 2,068 3,523 17,156 26,205 Home equity and lines of credit Pass 31,485 18,195 12,156 9,063 4,142 26,323 — 101,364 Special Mention — — — — — 301 — 301 Substandard — — 97 87 — 174 — 358 Total home equity and lines of credit 31,485 18,195 12,253 9,150 4,142 26,798 — 102,023 Total real estate loans 657,419 648,318 494,167 403,650 333,870 1,049,318 58,188 3,644,930 Commercial and industrial Pass 95,854 25,987 7,399 4,089 1,027 14,882 1,876 151,114 Special Mention — — 279 235 138 253 — 905 Substandard — 395 116 397 — 793 — 1,701 Total commercial and industrial 95,854 26,382 7,794 4,721 1,165 15,928 1,876 153,720 Other Pass 1,929 165 25 33 4 99 — 2,255 Total other 1,929 165 25 33 4 99 — 2,255 Total loans held-for-investment, net $ 755,202 $ 674,865 $ 501,986 $ 408,404 $ 335,039 $ 1,065,345 $ 60,064 $ 3,800,905 The following table details the recorded investment of loans held-for-investment, excluding PCI loans, net of deferred fees and costs, by loan type and credit quality indicator at December 31, 2020 (in thousands): December 31, 2020 Real Estate Multifamily Commercial One-to-Four Family Construction and Land Home Equity and Lines of Credit Commercial and Industrial Other Total Internal Risk Rating Pass $ 2,497,556 $ 667,568 $ 207,633 $ 74,351 $ 92,385 $ 189,372 $ 3,026 $ 3,731,891 Special Mention 458 20,422 2,456 — 311 498 — 24,145 Substandard 14,920 29,576 2,133 — 441 1,611 3 48,684 Total loans held-for-investment, net $ 2,512,934 $ 717,566 $ 212,222 $ 74,351 $ 93,137 $ 191,481 $ 3,029 $ 3,804,720
Estimated Expected Future Cash Flows of Each PCI Loan Pool	The following tables set forth the detail, and delinquency status, of non-performing loans (non-accrual loans and loans past due 90 days or more and still accruing), net of deferred fees and costs, at September 30, 2021, and December 31, 2020, excluding PCD/PCI loans (in thousands): September 30, 2021 Total Non-Performing Loans Non-Accruing Loans Current 30-89 Days Past Due 90 Days or More Past Due Total 90 Days or More Past Due and Accruing Total Non-Performing Loans Loans held-for-investment: Real estate loans: Commercial Substandard $ 2,907 $ 73 $ 1,887 $ 4,867 $ 206 $ 5,073 Total commercial 2,907 73 1,887 4,867 206 5,073 One-to-four family residential Substandard — — 314 314 60 374 Total one-to-four family residential — — 314 314 60 374 Multifamily Substandard — — 1,903 1,903 — 1,903 Total multifamily — — 1,903 1,903 — 1,903 Home equity and lines of credit Pass — — — — 6 6 Substandard — — 126 126 — 126 Total home equity and lines of credit — — 126 126 6 132 Total real estate 2,907 73 4,230 7,210 272 7,482 Commercial and industrial loans Substandard — 35 — 35 — 35 Total commercial and industrial loans — 35 — 35 — 35 Total non-performing loans $ 2,907 $ 108 $ 4,230 $ 7,245 $ 272 $ 7,517 December 31, 2020 Total Non-Performing Loans Non-Accruing Loans Current 30-89 Days Past Due 90 Days or More Past Due Total 90 Days or More Past Due and Accruing Total Non-Performing Loans Loans held-for-investment: Real estate loans: Commercial Pass $ — $ — $ — $ — $ 500 $ 500 Substandard 2,829 537 2,863 6,229 — 6,229 Total commercial 2,829 537 2,863 6,229 500 6,729 One-to-four family residential Substandard 413 — 493 906 174 1,080 Total one-to-four family residential 413 — 493 906 174 1,080 Multifamily Substandard — — 1,153 1,153 — 1,153 Total multifamily — — 1,153 1,153 — 1,153 Home equity and lines of credit Substandard 60 — 131 191 — 191 Total home equity and lines of credit 60 — 131 191 — 191 Total real estate 3,302 537 4,640 8,479 674 9,153 Commercial and industrial loans Pass — — — — 101 101 Special Mention — — — — 85 85 Substandard — — 37 37 250 287 Total commercial and industrial loans — — 37 37 436 473 Other loans Pass — — — — 3 3 Total other — — — — 3 3 Total non-performing loans $ 3,302 $ 537 $ 4,677 $ 8,516 $ 1,113 $ 9,629
Detail and Delinquency Status of Originated Loans Held-for-Investment, Net of Deferred Fees and Costs, by Performing and Non-Performing Loans	The following tables set forth the detail and delinquency status of loans held-for-investment, excluding PCD/PCI loans, net of deferred fees and costs, at September 30, 2021, and December 31, 2020 (in thousands): September 30, 2021 Past Due Loans 30-89 Days Past Due 90 Days or More Past Due 90 Days or More Past Due and Accruing Total Past Due Current Total Loans Receivable, net Loans held-for-investment: Real estate loans: Commercial Pass $ 346 $ — $ — $ 346 $ 754,941 $ 755,287 Special Mention — — — — 5,750 5,750 Substandard 1,458 1,887 206 3,551 18,767 22,318 Total commercial 1,804 1,887 206 3,897 779,458 783,355 One-to-four family residential Pass 374 — — 374 180,482 180,856 Special Mention 560 — — 560 2,337 2,897 Substandard 160 314 60 534 2,764 3,298 Total one-to-four family residential 1,094 314 60 1,468 185,583 187,051 Construction and land Pass — — — — 26,205 26,205 Total construction and land — — — — 26,205 26,205 Multifamily Pass 1,109 — — 1,109 2,528,233 2,529,342 Special Mention — — — — 429 429 Substandard 2,201 1,903 — 4,104 12,421 16,525 Total multifamily 3,310 1,903 — 5,213 2,541,083 2,546,296 Home equity and lines of credit Pass 64 — 6 70 101,294 101,364 Special Mention 196 — — 196 105 301 Substandard 97 126 — 223 135 358 Total home equity and lines of credit 357 126 6 489 101,534 102,023 Total real estate 6,565 4,230 272 11,067 3,633,863 3,644,930 Commercial and industrial Pass 1,702 — — 1,702 149,412 151,114 Special Mention 94 — — 94 811 905 Substandard 35 — — 35 1,666 1,701 Total commercial and industrial 1,831 — — 1,831 151,889 153,720 Other loans Pass 6 — — 6 2,249 2,255 Total other loans 6 — — 6 2,249 2,255 Total loans held-for-investment $ 8,402 $ 4,230 $ 272 $ 12,904 $ 3,788,001 $ 3,800,905 December 31, 2020 Past Due Loans 30-89 Days Past Due 90 Days or More Past Due 90 Days or More Past Due and Accruing Total Past Due Current Total Loans Receivable, net Loans held-for-investment: Real estate loans: Commercial Pass $ 6,072 $ — $ 500 $ 6,572 $ 660,996 $ 667,568 Special Mention 72 — — 72 20,350 20,422 Substandard 3,185 2,863 — 6,048 23,528 29,576 Total commercial 9,329 2,863 500 12,692 704,874 717,566 One-to-four family residential Pass 282 — — 282 207,351 207,633 Special Mention 870 — — 870 1,586 2,456 Substandard — 493 174 667 1,466 2,133 Total one-to-four family residential 1,152 493 174 1,819 210,403 212,222 Construction and land Pass 994 — — 994 73,357 74,351 Total construction and land 994 — — 994 73,357 74,351 Multifamily Pass 1,283 — — 1,283 2,496,273 2,497,556 Special Mention — — — — 458 458 Substandard 610 1,153 — 1,763 13,157 14,920 Total multifamily 1,893 1,153 — 3,046 2,509,888 2,512,934 Home equity and lines of credit Pass 80 — — 80 92,305 92,385 Special Mention 200 — — 200 111 311 Substandard 100 131 — 231 210 441 Total home equity and lines of credit 380 131 — 511 92,626 93,137 Total real estate 13,748 4,640 674 19,062 3,591,148 3,610,210 Commercial and industrial Pass 632 — 101 733 188,639 189,372 Special Mention 61 — 85 146 352 498 Substandard 67 37 250 354 1,257 1,611 Total commercial and industrial 760 37 436 1,233 190,248 191,481 Other loans Pass 11 — 3 14 3,012 3,026 Substandard — — — — 3 3 Total other loans 11 — 3 14 3,015 3,029 Total loans held-for-investment $ 14,519 $ 4,677 $ 1,113 $ 20,309 $ 3,784,411 $ 3,804,720
Schedule of Non-accrual Loans, Excluding PCD Loans	The following tables summarize information on non-accrual loans, excluding PCD loans, at September 30, 2021 (in thousands): For the Three Months Ended For the Nine Months Ended September 30, 2021 Recorded Investment Unpaid Principal Balance With No Related Allowance Interest Income Interest Income Real estate loans: Commercial $ 4,867 $ 5,377 $ 3,759 $ 17 $ 67 One-to-four family residential 314 346 — 4 10 Multifamily 1,903 1,912 516 27 60 Home equity and lines of credit 126 375 — — 2 Commercial and industrial 35 357 2 3 7 Total non-accrual loans $ 7,245 $ 8,367 $ 4,277 $ 51 $ 146
Summary of Impaired Loans	The following table summarizes impaired loans, excluding PCI loans, at December 31, 2020 (in thousands): December 31, 2020 Recorded Investment Unpaid Principal Balance Related Allowance With No Allowance Recorded: Real estate loans: Commercial $ 8,838 $ 10,076 $ — One-to-four family residential 1,903 2,032 — Multifamily 626 1,097 — Home equity and lines of credit 15 15 — Total Real Estate 11,382 13,220 — With a Related Allowance Recorded: Real estate loans: Commercial 1,812 2,244 (66) Home equity and lines of credit 32 32 (3) Total Real Estate 1,844 2,276 (69) Commercial and industrial loans 16 16 (4) Total: Real estate loans Commercial 10,650 12,320 (66) One-to-four family residential 1,903 2,032 — Multifamily 626 1,097 — Home equity and lines of credit 47 47 (3) Commercial and industrial loans 16 16 (4) $ 13,242 $ 15,512 $ (73) The following table summarizes the average recorded investment in impaired loans, excluding PCI loans, and interest income recognized as of, and for, the three and nine months ended September 30, 2020 (in thousands): For the Three Months Ended For the Nine Months Ended September 30, 2020 September 30, 2020 Average Recorded Investment Interest Income Average Recorded Investment Interest Income With No Allowance Recorded: Real estate loans: Commercial $ 12,633 $ 50 $ 14,415 $ 336 One-to-four family residential 1,920 23 2,192 85 Multifamily 672 10 853 40 Home equity and lines of credit 18 1 19 1 Commercial and industrial loans 37 — 38 — With a Related Allowance Recorded: Real estate loans: Commercial 4,097 26 2,514 83 One-to-four family residential 261 — 131 — Home equity and lines of credit 32 — 32 1 Commercial and industrial loans 17 — 17 — Total: Real estate loans Commercial 16,730 76 16,929 419 One-to-four family residential 2,181 23 2,323 85 Multifamily 672 10 853 40 Home equity and lines of credit 50 1 51 2 Commercial and industrial loans 54 — 55 — $ 19,687 $ 110 $ 20,211 $ 546
Troubled Debt Restructurings on Financing Receivables	The following tables summarize loans that were modified in a troubled debt restructuring (“TDR”) during the nine months ended September 30, 2021 and September 30, 2020: Nine Months Ended September 30, 2021 Number of Relationships Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (1) (in thousands) Troubled Debt Restructurings Commercial and industrial 1 $ 75 75 Total Troubled Debt Restructurings 1 $ 75 $ 75 (1) Amounts are at time of modification Nine Months Ended September 30, 2020 Number of Relationships Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment (1) (in thousands) Troubled Debt Restructurings Residential 1 $ 187 $ 187 Commercial real estate 2 544 544 Total Troubled Debt Restructurings 3 $ 731 $ 731 (1) Amounts are at time of modification

Allowance for Credit Losses (_2

Allowance for Credit Losses (“ACL”) on Loans (Tables)	9 Months Ended
	Sep. 30, 2021
Credit Loss [Abstract]
Schedule of Allowance for Credit Losses for Off-Balance Sheet credit Exposures	The table below summarizes the allowance for credit losses for off-balance sheet credit exposures (in thousands): Three Months Ended Nine Months Ended Balance at beginning of period $ 1,808 $ 808 Impact of CECL adoption — 737 Balance at beginning of period 1,808 1,545 Provision for credit losses 265 528 Balance at end of period $ 2,073 $ 2,073
Allowance For Loan Losses And Loans Receivable By Portfolio Segment Table	The following tables set forth activity in our allowance for credit losses on loans, by loan type, as of, and for the three and nine months ended September 30, 2021, and September 30, 2020 (in thousands): Three Months Ended September 30, 2021 Real Estate Commercial (1) One-to-Four Family Construction and Land Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCD) PCD Total Allowance for credit losses: Beginning balance $ 26,540 $ 4,610 $ 259 $ 663 $ 2,594 $ 7 $ 34,673 $ 4,820 $ 39,493 Charge-offs — — — — (541) (3) (544) — (544) Recoveries — 27 — 25 6 3 61 — 61 Provisions (credit) (297) (230) (69) (46) 542 (1) (101) (47) (148) Ending balance $ 26,243 $ 4,407 $ 190 $ 642 $ 2,601 $ 6 $ 34,089 $ 4,773 $ 38,862 (1) Commercial includes commercial real estate loans collateralized by owner-occupied, non-owner occupied, and multifamily properties. Three Months Ended September 30, 2020 Real Estate Commercial One-to-Four Family Construction and Land Multifamily Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCI) PCI Total Allowance for loan losses: Beginning balance $ 6,699 $ 272 $ 937 $ 27,243 $ 558 $ 1,846 $ 176 $ 37,731 $ 789 $ 38,520 Charge-offs (12) — — — — — — (12) — (12) Recoveries 16 — — — 26 1 — 43 — 43 Provisions (credit) 890 (50) 198 (596) (157) (73) (47) 165 — 165 Ending balance $ 7,593 $ 222 $ 1,135 $ 26,647 $ 427 $ 1,774 $ 129 $ 37,927 $ 789 $ 38,716 Nine Months Ended September 30, 2021 Real Estate Commercial (1) One-to-Four Family Construction and Land Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCD) PCD Total Allowance for credit losses: Beginning balance $ 33,005 $ 207 $ 1,214 $ 260 $ 1,842 $ 198 $ 36,726 $ 881 $ 37,607 Impact of CECL adoption (1,949) 5,233 (921) 419 947 (188) 3,541 6,812 10,353 Balance at January 1, 2021 31,056 5,440 293 679 2,789 10 40,267 7,693 47,960 Charge-offs — (21) — — (553) (3) (577) (2,411) (2,988) Recoveries 19 29 — 26 34 5 113 — 113 Provisions (credit) (4,832) (1,041) (103) (63) 331 (6) (5,714) (509) (6,223) Ending balance $ 26,243 $ 4,407 $ 190 $ 642 $ 2,601 $ 6 $ 34,089 $ 4,773 $ 38,862 (1) Commercial includes commercial real estate loans collateralized by owner-occupied, non-owner occupied, and multifamily properties. Nine Months Ended September 30, 2020 Real Estate Commercial One-to-Four Family Construction and Land Multifamily Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCI) PCI Total Allowance for loan losses: Beginning balance $ 4,891 $ 180 $ 536 $ 20,203 $ 317 $ 1,640 $ 151 $ 27,918 $ 789 $ 28,707 Charge-offs (609) — — — — (94) — (703) — (703) Recoveries 411 — — — 26 6 — 443 — 443 Provisions (credit) 2,900 42 599 6,444 84 222 (22) 10,269 — 10,269 Ending balance $ 7,593 $ 222 $ 1,135 $ 26,647 $ 427 $ 1,774 $ 129 $ 37,927 $ 789 $ 38,716 The following tables detail the amount of loans receivable held-for-investment, net of deferred loan fees and costs, that are evaluated, individually and collectively, for impairment, and the related portion of the allowance for credit losses that is allocated to each loan portfolio segment, at September 30, 2021 and December 31, 2020 (in thousands): September 30, 2021 Real Estate Commercial (1) One-to-Four Family Construction and Land Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCD) PCD Total Allowance for credit losses on loans: Ending balance: individually evaluated for impairment $ 26 $ 3 $ — $ 3 $ — $ — $ 32 $ — $ 32 Ending balance: collectively evaluated for impairment 26,217 4,404 190 639 2,601 6 34,057 4,773 38,830 Loans, net: Ending balance 3,329,651 187,051 26,205 102,023 153,720 2,255 3,800,905 16,054 3,816,959 Ending balance: individually evaluated for impairment 10,091 1,586 — 41 13 — 11,731 — 11,731 Ending balance: collectively evaluated for impairment 3,319,560 185,465 26,205 101,982 80,760 2,255 3,716,227 16,054 3,732,281 PPP loans not evaluated for impairment (2) — — — — 72,947 — 72,947 — 72,947 December 31, 2020 Real Estate Commercial One-to-Four Family Construction and Land Multifamily Home Equity and Lines of Credit Commercial and Industrial Other Total Loans (excluding PCI) PCI Total Allowance for loan losses: Ending balance: individually evaluated for impairment $ 66 $ — $ — $ — $ 3 $ 4 $ — $ 73 $ — $ 73 Ending balance: collectively evaluated for impairment 5,944 207 1,214 26,995 257 1,838 198 36,653 881 37,534 Loans, net: Ending balance 717,566 212,222 74,351 2,512,934 93,137 191,481 3,029 3,804,720 18,518 3,823,238 Ending balance: individually evaluated for impairment 10,650 1,903 — 626 47 16 — 13,242 — 13,242 Ending balance: collectively evaluated for impairment 706,916 210,319 74,351 2,512,308 93,090 64,930 3,029 3,664,943 18,518 3,683,461 PPP loans not evaluated for impairment (2) — — — — — 126,535 — 126,535 — 126,535 (1) Commercial includes commercial real estate loans collateralized by owner-occupied, non-owner occupied, and multifamily properties. (2) PPP loans are guaranteed by the SBA and therefore excluded from the allowance for credit losses.

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2021
Deposits [Abstract]
Deposit Account Balances	Deposit account balances are summarized as follows (in thousands): September 30, 2021 December 31, 2020 Non-interest-bearing checking $ 869,008 $ 695,831 NOW and interest-bearing checking 1,056,876 905,208 Savings and money market 1,807,529 1,953,885 Certificates of deposit 407,967 521,627 Total deposits $ 4,141,380 $ 4,076,551
Interest Expense on Deposits	Interest expense on deposit accounts is summarized for the periods indicated (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 NOW and interest-bearing checking, savings, and money market $ 671 $ 2,023 $ 2,448 $ 8,990 Certificates of deposit 749 3,620 2,513 13,405 Total interest expense on deposit accounts $ 1,420 $ 5,643 $ 4,961 $ 22,395

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock Options Outstanding	The following table is a summary of the Company’s stock options outstanding as of September 30, 2021, and changes therein during the nine months then ended. Number of Stock Options Weighted Average Grant Date Fair Value Weighted Average Exercise Price Weighted Average Contractual Life (years) Outstanding - December 31, 2020 2,214,193 $ 4.01 $ 13.94 3.96 Forfeited (41,090) 3.96 13.62 — Exercised (262,801) 3.93 13.56 — Outstanding - September 30, 2021 1,910,302 4.02 14.00 3.25 Exercisable - September 30, 2021 1,893,223 4.02 13.98 3.25
Status of the Company's Restricted Share Awards	The following is a summary of the status of the Company’s restricted stock awards at September 30, 2021, and changes therein during the nine months then ended. Number of Shares Awarded Weighted Average Grant Date Fair Value Non-vested at December 31, 2020 104,010 $ 15.91 Granted 176,930 12.59 Vested (38,470) 15.81 Forfeited (14,138) 13.86 Non-vested at September 30, 2021 228,332 13.48

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Significant Fair Value of Assets and Liabilities Measured on Recurring and Non Recurring Basis	Fair Value Measurements at September 30, 2021 Using: Carrying Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (in thousands) Measured on a recurring basis: Assets: Investment securities: Debt securities available-for-sale: U.S. Government agency $ 2,327 $ — $ 2,327 $ — Mortgage-backed securities: Pass-through certificates: GSE 363,100 — 363,100 — REMICs: GSE 560,213 — 560,213 — 923,313 — 923,313 — Other debt securities: Municipal bonds 78 — 78 — Corporate bonds 159,093 — 159,093 — 159,171 — 159,171 — Total debt securities available-for-sale 1,084,811 — 1,084,811 — Trading securities 12,761 12,761 — — Equity securities (1) 215 215 — — Total $ 1,097,787 $ 12,976 $ 1,084,811 $ — Measured on a non-recurring basis: Assets: Loans individually evaluated for impairment: Real estate loans: Commercial real estate $ 3,745 $ — $ — $ 3,745 One-to-four family residential mortgage 488 — — 488 Multifamily 6 — — 6 Home equity and lines of credit 28 — — 28 Total individually evaluated real estate loans 4,267 — — 4,267 Commercial and industrial loans 13 — — 13 Other real estate owned 100 — — 100 Total $ 4,380 $ — $ — $ 4,380 (1) Excludes investment measured at net asset value of $5.0 million at September 30, 2021, which has not been classified in the fair value hierarchy. Fair Value Measurements at December 31, 2020 Using: Carrying Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (in thousands) Measured on a recurring basis: Assets: Investment securities: Debt securities available-for-sale: U.S. Government agency securities $ 3,158 $ — $ 3,158 $ — Mortgage-backed securities: Pass-through certificates: GSE 281,343 — 281,343 — REMICs: GSE 890,965 — 890,965 — Non-GSE 4 — 4 — 1,172,312 — 1,172,312 — Other debt securities: Municipal bonds 123 — 123 — Corporate bonds 88,418 — 88,418 — Asset-backed securities 794 — 794 — 89,335 — 89,335 — Total debt securities available-for-sale 1,264,805 — 1,264,805 — Trading securities 12,291 12,291 — — Equity securities 253 253 — — Total $ 1,277,349 $ 12,544 $ 1,264,805 $ — Measured on a non-recurring basis: Assets: Impaired loans: Real estate loans: Commercial real estate $ 5,268 $ — $ — $ 5,268 Multifamily 16 — — 16 Home equity and lines of credit 28 — — 28 Total impaired real estate loans 5,312 — — 5,312 Commercial and industrial loans 13 — — 13 Total $ 5,325 $ — $ — $ 5,325
Level 3 Assets Measured at Fair Value on a Non-Recurring Basis	The following table presents qualitative information for Level 3 assets measured at fair value on a non-recurring basis at September 30, 2021 and December 31, 2020 (dollars in thousands): Fair Value Valuation Methodology Unobservable Range of Inputs September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Individually evaluated loans $ 4,280 $ 5,325 Appraisals Discount for costs to sell 7.0% 7.0% Discount for quick sale 10.0% 10.0% Discounted cash flows Interest rates 4.88% to 6.25% 4.88% to 6.25% Other real estate owned 100 — Appraisals Discount for costs to sell 7.0% N/A
Estimated Fair Values of Significant Financial Instruments	The estimated fair value of the Company’s financial instruments at September 30, 2021 and December 31, 2020, is presented in the following tables (in thousands): September 30, 2021 Estimated Fair Value Carrying Value Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 173,694 $ 173,694 $ — $ — $ 173,694 Trading securities 12,761 12,761 — — 12,761 Debt securities available-for-sale 1,084,811 — 1,084,811 — 1,084,811 Debt securities held-to-maturity 5,811 — 6,083 — 6,083 Equity securities (1) 215 215 — — 215 FHLBNY stock, at cost 22,336 — 22,336 — 22,336 Net loans held-for-investment 3,778,097 — — 3,893,911 3,893,911 Derivative assets 865 — 865 — 865 Financial liabilities: Deposits $ 4,141,380 $ — $ 4,144,981 $ — $ 4,144,981 Borrowed funds 421,804 — 430,730 — 430,730 Advance payments by borrowers for taxes and insurance 23,496 — 23,496 — 23,496 Derivative liabilities 867 — 867 — 867 (1) Excludes investment measured at net asset value of $5.0 million at September 30, 2021, which has not been classified in the fair value hierarchy. December 31, 2020 Estimated Fair Value Carrying Value Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 87,544 $ 87,544 $ — $ — $ 87,544 Trading securities 12,291 12,291 — — 12,291 Debt securities available-for-sale 1,264,805 — 1,264,805 — 1,264,805 Debt securities held-to-maturity 7,234 — 7,574 — 7,574 Equity securities 253 253 — — 253 FHLBNY stock, at cost 28,641 — 28,641 — 28,641 Loans held-for-sale 19,895 — — 19,895 19,895 Net loans held-for-investment 3,785,631 — — 3,842,054 3,842,054 Derivative assets 1,498 — 1,498 — 1,498 Financial liabilities: Deposits $ 4,076,551 $ — $ 4,082,538 $ — $ 4,082,538 Borrowed funds 591,789 — 609,900 — 609,900 Advance payments by borrowers for taxes and insurance 19,677 — 19,677 — 19,677 Derivative liabilities 1,502 — 1,502 — 1,502

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share Calculations and Reconciliation	The following is a summary of the Company’s earnings per share calculations and reconciliation of basic to diluted earnings per share for the periods indicated (in thousands, except per share data): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net income available to common stockholders $ 16,080 $ 8,582 $ 54,551 $ 23,926 Weighted average shares outstanding-basic 48,095,473 50,707,691 48,838,396 48,131,005 Effect of non-vested restricted stock and stock options outstanding 390,623 12,112 298,641 79,276 Weighted average shares outstanding-diluted 48,486,096 50,719,803 49,137,037 48,210,281 Earnings per share-basic $ 0.33 $ 0.17 $ 1.12 $ 0.50 Earnings per share-diluted $ 0.33 $ 0.17 $ 1.11 $ 0.50 Anti-dilutive shares 125,744 2,287,010 417,955 1,868,511

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Lease, Cost	Supplemental lease information at or for the nine months ended September 30, 2021, and September 30, 2020 is as follows (dollars in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Operating lease cost $ 1,409 $ 2,073 $ 4,317 $ 4,935 Variable lease cost 974 878 3,219 2,378 Net lease cost $ 2,383 $ 2,951 $ 7,536 $ 7,313 Cash paid for amounts included in measurement of operating lease liabilities $ 1,568 $ 2,111 $ 4,967 $ 5,180 Right-of-use assets obtained in exchange for new operating lease liabilities $ 1,596 $ — $ 1,596 $ 3,028 Weighted average remaining lease term 11.89 years 12.39 years Weighted average discount rate 3.55 % 3.55 %
Lessee, Operating Lease, Liability, Maturity	The following table summarizes lease payment obligations for each of the next five years and thereafter in addition to a reconcilement to the Company's current lease liability (in thousands): Year Amount 2021 $ 1,571 2022 5,923 2023 5,802 2024 5,372 2025 5,024 Thereafter 28,382 Total lease payments 52,074 Less: imputed interest 10,984 Present value of lease liabilities $ 41,090

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Schedule of Non-Interest Income	The following table summarizes non-interest income for the periods indicated (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Fees and service charges for customer services: Service charges $ 763 $ 565 $ 2,173 $ 1,674 ATM and card interchange fees 515 351 1,397 930 Investment fees 92 93 324 191 Total fees and service charges for customer services 1,370 1,009 3,894 2,795 Income on bank-owned life insurance (1) 862 894 2,567 2,635 Gains on available-for-sale debt securities, net (1) 370 45 976 105 (Losses)/gains on trading securities, net (1) (75) 763 1,096 397 Gains on sales of loans (1) — — 1,401 665 Swap income (1) — 307 — 691 Other 101 4 246 81 Total non-interest income $ 2,628 $ 3,022 $ 10,180 $ 7,369 (1) Not in scope of Topic 606

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Liabilities at Fair Value	The table below presents the fair value of the derivatives as well as their location on the consolidated balance sheets (in thousands): Fair Value Balance Sheet Location September 30, 2021 December 31, 2020 Other assets $ 865 $ 1,498 Other liabilities 867 1,502
Schedule of Derivative Assets at Fair Value	The table below presents the fair value of the derivatives as well as their location on the consolidated balance sheets (in thousands): Fair Value Balance Sheet Location September 30, 2021 December 31, 2020 Other assets $ 865 $ 1,498 Other liabilities 867 1,502

Consolidated Financial Statem_3

Consolidated Financial Statements - Narrative (Details) $ in Thousands	Dec. 31, 2020USD ($)	Sep. 30, 2021USD ($)loan	Sep. 30, 2021USD ($)loan	Jun. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Allowance for credit loss	$ 37,607	$ 38,862	$ 38,862	$ 39,493	$ 38,716	$ 38,520	$ 28,707
Unfounded credit commitment	808	2,073	2,073	1,808
Financing receivable	3,823,238	3,816,959	3,816,959
Net loans held-for-investment	3,785,631	$ 3,778,097	3,778,097
Cumulative Effect, Period of Adoption, Adjustment
Unusual or Infrequent Item, or Both [Line Items]
Increase in allowance for credit losses	11,100
Allowance for credit loss	10,353
Unfounded credit commitment	737			$ 0
PCD loan related reserves	6,800
Non-PCD loan related reserves	$ 4,300
COVID-19
Unusual or Infrequent Item, or Both [Line Items]
Loan modification program, payment deferral period		90 days
Loan modification program, extension for payment deferral period		90 days
Net loans held-for-investment		$ 798	798
COVID-19
Unusual or Infrequent Item, or Both [Line Items]
Financing receivable		$ 232,200	$ 232,200
Number of loans approved | loan		2,300	2,300
Loan processing fee		$ 9,500	$ 9,500
Loan processing fee recognized as earnings		$ 4,300	$ 6,200
Number of loans outstanding | loan		733	733
Net loans held-for-investment		$ 72,900	$ 72,900

Business Combinations - Additio

Business Combinations - Additional Information (Details) $ in Thousands	Jul. 01, 2020USD ($)lease_obligationloanshares	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Business Acquisition [Line Items]
Total assets		$ 5,398,085	$ 5,514,544
Net loans held-for-investment		3,778,097	3,785,631
Deposits		4,141,380	4,076,551
Operating lease liabilities		41,090	42,734
Operating lease right-of-use assets		35,063	$ 36,741
Victory
Business Acquisition [Line Items]
Total assets	$ 402,800
Net loans held-for-investment	180,400
Deposits	$ 354,600
Number of branches | loan	6
Victory
Business Acquisition [Line Items]
Common stock exchange rate (shares) | shares	2.0463
Adjustment to the carrying value of goodwill		304
Adjustment to deferred tax assets		$ 304
Number of lease obligations | lease_obligation	5
Operating lease liabilities	$ 2,500
Operating lease right-of-use assets	$ 2,500

Business Combinations - Fair Va

Business Combinations - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Jul. 01, 2020
Liabilities assumed:
Goodwill recorded in the merger	$ 41,012	$ 41,320
Victory
Business Acquisition [Line Items]
Total Purchase Price			$ 41,173
Assets acquired:
Cash and cash equivalents			72,875
Debt securities available for sale			126,931
Loans			180,431
Accrued interest receivable			1,415
Bank-owned life insurance			5,714
Premises and equipment			7,789
Other assets			5,010
Total assets acquired			400,165
Liabilities assumed:
Deposits			354,592
Other liabilities			7,001
Total liabilities assumed			361,593
Net assets acquired			38,572
Goodwill recorded in the merger			$ 2,601

Business Combinations - Summary

Business Combinations - Summary of Credit Impaired Loans Acquired (Details) - Victory $ in Thousands	Jul. 01, 2020USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest	$ 7,809
Contractual cash flows not expected to be collected (non-accretable discount)	3,315
Expected cash flows to be collected at acquisition	4,494
Interest component of expected cash flows (accretable yield)	(599)
Fair value of acquired loans	$ 3,895

Debt Securities Available-for_3

Debt Securities Available-for-Sale - Comparative Summary of Mortgage-Backed Securities and Other Securities Available-for-Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,074,355	$ 1,246,673
Gross unrealized gains	12,327	18,862
Gross unrealized losses	(1,871)	(730)
Estimated fair value	1,084,811	1,264,805
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,344	3,168
Gross unrealized gains	0	0
Gross unrealized losses	(17)	(10)
Estimated fair value	2,327	3,158
Real estate mortgage investment conduits (REMICs)
Debt Securities, Available-for-sale [Line Items]
Amortized cost	913,326	1,155,285
Gross unrealized gains	11,747	17,747
Gross unrealized losses	(1,760)	(720)
Estimated fair value	923,313	1,172,312
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	158,685	88,220
Gross unrealized gains	580	1,115
Gross unrealized losses	(94)	0
Estimated fair value	159,171	89,335
GSE | Pass-through Certificates
Debt Securities, Available-for-sale [Line Items]
Amortized cost	356,687	270,867
Gross unrealized gains	7,341	10,720
Gross unrealized losses	(928)	(244)
Estimated fair value	363,100	281,343
GSE | Real estate mortgage investment conduits (REMICs)
Debt Securities, Available-for-sale [Line Items]
Amortized cost	556,639	884,414
Gross unrealized gains	4,406	7,027
Gross unrealized losses	(832)	(476)
Estimated fair value	560,213	890,965
Non-GSE | Real estate mortgage investment conduits (REMICs)
Debt Securities, Available-for-sale [Line Items]
Amortized cost		4
Gross unrealized gains		0
Gross unrealized losses		0
Estimated fair value		4
Municipal bonds | Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	77	122
Gross unrealized gains	1	1
Gross unrealized losses	0	0
Estimated fair value	78	123
Corporate bonds | Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	158,608	87,319
Gross unrealized gains	579	1,099
Gross unrealized losses	(94)	0
Estimated fair value	$ 159,093	88,418
Asset-backed securities | Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost		779
Gross unrealized gains		15
Gross unrealized losses		0
Estimated fair value		$ 794

Debt Securities Available-for_4

Debt Securities Available-for-Sale - Summary of Expected Maturity Distribution of Debt Securities Available-for-Sale, Other than Mortgage-Backed Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized cost
Amortized cost	$ 1,074,355	$ 1,246,673
Estimated fair value
Estimated fair value	1,084,811	$ 1,264,805
Other Than Mortgage Backed Securities
Amortized cost
Due in one year or less	45,327
Due after one year through five years	98,348
Due after five years through ten years	17,354
Amortized cost	161,029
Estimated fair value
Due in one year or less	45,587
Due after one year through five years	98,631
Due after five years through ten years	17,280
Estimated fair value	$ 161,498

Debt Securities Available-for_5

Debt Securities Available-for-Sale - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)securityloan	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)securityloan	Sep. 30, 2020USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, restricted	$ 498,200		$ 498,200
Proceeds from sales and calls of debt securities available-for-sale	112,500	$ 4,500	207,991	$ 17,121
Debt securities, available-for-sale, realized gain	370	48	976	122
Debt securities, available-for-sale, realized loss	0	3	0	17
Debt securities, trading, realized gain (loss)	(75)	$ 763	1,100	$ 397
Accrued interest receivable associated with debt securities available-for-sale	$ 1,700		$ 1,700
Real Estate Mortgage Investment Conduits (REMICs) | GSE
Debt Securities, Available-for-sale [Line Items]
Number of debt securities, unrealized loss position longer than 12 months | loan	18		18
Number of debt securities, unrealized loss position less than 12 months | security	1		1
Real Estate Mortgage Investment Conduits (REMICs) | GSE | Pass Through
Debt Securities, Available-for-sale [Line Items]
Number of debt securities, unrealized loss position longer than 12 months | security	15		15
Number of debt securities, unrealized loss position less than 12 months | security	14		14
Real Estate Mortgage Investment Conduits (REMICs) | GSE | Non Pass Through
Debt Securities, Available-for-sale [Line Items]
Number of debt securities, unrealized loss position less than 12 months | security	19		19
Real Estate Mortgage Investment Conduits (REMICs) | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Number of debt securities, unrealized loss position less than 12 months | security	6		6

Debt Securities Available-for_6

Debt Securities Available-for-Sale - Gross Unrealized Losses on Mortgage-Backed Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Unrealized losses, less than 12 months	$ (1,578)	$ (719)
Estimated fair value, less than 12 months	330,723	242,146
Unrealized losses, 12 months or more	(293)	(11)
Estimated fair value, 12 months or more	19,105	459
Unrealized losses, total	(1,871)	(730)
Estimated fair value, total	349,828	242,605
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses, less than 12 months	(17)	(10)
Estimated fair value, less than 12 months	2,327	3,158
Unrealized losses, 12 months or more	0	0
Estimated fair value, 12 months or more	0	0
Unrealized losses, total	(17)	(10)
Estimated fair value, total	2,327	3,158
GSE | Pass-through Certificates
Debt Securities, Available-for-sale [Line Items]
Unrealized losses, less than 12 months	(684)	(233)
Estimated fair value, less than 12 months	151,998	28,419
Unrealized losses, 12 months or more	(244)	(11)
Estimated fair value, 12 months or more	15,056	459
Unrealized losses, total	(928)	(244)
Estimated fair value, total	167,054	28,878
GSE | Real estate mortgage investment conduits (REMICs)
Debt Securities, Available-for-sale [Line Items]
Unrealized losses, less than 12 months	(783)	(476)
Estimated fair value, less than 12 months	126,493	210,569
Unrealized losses, 12 months or more	(49)	0
Estimated fair value, 12 months or more	4,049	0
Unrealized losses, total	(832)	(476)
Estimated fair value, total	130,542	$ 210,569
Corporate bonds | Other debt securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses, less than 12 months	(94)
Estimated fair value, less than 12 months	49,905
Unrealized losses, 12 months or more	0
Estimated fair value, 12 months or more	0
Unrealized losses, total	(94)
Estimated fair value, total	$ 49,905

Debt Securities Held-to-Matur_3

Debt Securities Held-to-Maturity - Mortgage Backed Securities Held-to-Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 5,811	$ 7,234
Gross Unrealized Gains	272	340
Gross Unrealized Losses	0	0
Estimated Fair Value	6,083	7,574
Mortgage Backed Securities Pass Through Certificates
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	5,811	7,234
Gross Unrealized Gains	272	340
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 6,083	$ 7,574

Debt Securities Held-to-Matur_4

Debt Securities Held-to-Maturity - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Dec. 31, 2020security
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity securities sold	$ 0	$ 0
Held-to-maturity securities pledged to secure borrowings and deposits	$ 736,000
Held-to-maturity securities unrealized loss position | security	0		0
Allowance for credit losses	$ 0
Accrued interest receivable associated with held-to-maturity securities	$ 18,000

Equity Securities (Details)

Equity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Equity securities	$ 5,219	$ 253
Money Market Funds
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, fair value	215	253
Small Business Administration Loan Fund
Debt and Equity Securities, FV-NI [Line Items]
Equity securities not been classified in the fair value	$ 5,000	$ 0

Loans - Net Loans Held-for-Inve

Loans - Net Loans Held-for-Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Loans held-for-investment, net	$ 3,816,959		$ 3,823,238
Less: allowance for credit losses	(38,862)	$ (39,493)	(37,607)	$ (38,716)	$ (38,520)	$ (28,707)
Net loans held-for-investment	3,778,097		3,785,631
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Deferred origination loan costs, net	0		4,795
Loans held-for-investment, net	3,800,905		3,804,720
Less: allowance for credit losses	(34,089)	(34,673)	(36,726)	(37,927)	(37,731)	(27,918)
PCD/PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Loans held-for-investment, net	16,054		18,518
Less: allowance for credit losses	(4,773)	(4,820)	(881)	(789)	(789)	(789)
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	3,644,930		3,602,544
Loans held-for-investment, net	3,644,930		3,610,210
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,546,296		2,509,310
Loans held-for-investment, net	2,546,296		2,512,934
Less: allowance for credit losses				(26,647)	(27,243)	(20,203)
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	783,355		716,973
Loans held-for-investment, net	783,355		717,566
Less: allowance for credit losses				(7,593)	(6,699)	(4,891)
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | One-to-four family residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	187,051		210,817
Loans held-for-investment, net	187,051		212,222
Less: allowance for credit losses	(4,407)	(4,610)	(207)	(222)	(272)	(180)
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Home equity and lines of credit
Loans and Leases Receivable Disclosure [Line Items]
Loans	102,023		91,126
Loans held-for-investment, net	102,023		93,137
Less: allowance for credit losses	(642)	(663)	(260)	(427)	(558)	(317)
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Construction and land
Loans and Leases Receivable Disclosure [Line Items]
Loans	26,205		74,318
Loans held-for-investment, net	26,205		74,351
Less: allowance for credit losses	(190)	(259)	(1,214)	(1,135)	(937)	(536)
Commercial and industrial and other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	155,975		197,381
Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	153,720		194,352
Loans held-for-investment, net	153,720		191,481
Less: allowance for credit losses	(2,601)	(2,594)	(1,842)	(1,774)	(1,846)	(1,640)
Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,255		3,029
Loans held-for-investment, net	2,255		3,029
Less: allowance for credit losses	(6)	$ (7)	(198)	$ (129)	$ (176)	$ (151)
Paycheck Protection Program | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 72,900		$ 126,500

Loans - Narrative, Loans Held-f

Loans - Narrative, Loans Held-for-Investment (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale	$ 0	$ 19,895
PCI loans	$ 3,816,959	$ 3,823,238
One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of PCI loans	16.00%	22.00%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of PCI loans	25.00%	23.00%
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of PCI loans	47.00%	40.00%
PCD/PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	$ 16,054	$ 18,518

Loans - Loans Held-for-Investme

Loans - Loans Held-for-Investment, Excluding PCD Loans, Net of Deferred Fees and Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment, net	$ 3,816,959	$ 3,823,238
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	755,202
2020	674,865
2019	501,986
2018	408,404
2017	335,039
Prior	1,065,345
Revolving Loans	60,064
Loans held-for-investment, net	3,800,905	3,804,720
Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment, net		3,731,891
Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment, net		24,145
Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment, net		48,684
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	657,419
2020	648,318
2019	494,167
2018	403,650
2017	333,870
Prior	1,049,318
Revolving Loans	58,188
Loans held-for-investment, net	3,644,930	3,610,210
Real estate loans: | Multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	531,300
2020	545,674
2019	360,059
2018	280,171
2017	244,623
Prior	583,980
Revolving Loans	489
Loans held-for-investment, net	2,546,296	2,512,934
Real estate loans: | Multifamily | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	531,300
2020	545,674
2019	355,399
2018	276,368
2017	244,623
Prior	575,489
Revolving Loans	489
Loans held-for-investment, net	2,529,342	2,497,556
Real estate loans: | Multifamily | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	429
Revolving Loans	0
Loans held-for-investment, net	429	458
Real estate loans: | Multifamily | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	4,660
2018	3,803
2017	0
Prior	8,062
Revolving Loans	0
Loans held-for-investment, net	16,525	14,920
Real estate loans: | Commercial mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	89,850
2020	73,551
2019	107,336
2018	100,274
2017	70,678
Prior	301,726
Revolving Loans	39,940
Loans held-for-investment, net	783,355	717,566
Real estate loans: | Commercial mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	89,850
2020	73,551
2019	98,944
2018	100,274
2017	67,806
Prior	288,266
Revolving Loans	36,596
Loans held-for-investment, net	755,287	667,568
Real estate loans: | Commercial mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	508
2018	0
2017	500
Prior	4,742
Revolving Loans	0
Loans held-for-investment, net	5,750	20,422
Real estate loans: | Commercial mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	7,884
2018	0
2017	2,372
Prior	8,718
Revolving Loans	3,344
Loans held-for-investment, net	22,318	29,576
Real estate loans: | One-to-four family residential mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	4,784
2020	9,342
2019	13,142
2018	13,530
2017	12,359
Prior	133,291
Revolving Loans	603
Loans held-for-investment, net	187,051	212,222
Real estate loans: | One-to-four family residential mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	4,784
2020	9,342
2019	12,089
2018	13,530
2017	12,359
Prior	128,149
Revolving Loans	603
Loans held-for-investment, net	180,856	207,633
Real estate loans: | One-to-four family residential mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	529
2018	0
2017	0
Prior	2,368
Revolving Loans	0
Loans held-for-investment, net	2,897	2,456
Real estate loans: | One-to-four family residential mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	524
2018	0
2017	0
Prior	2,774
Revolving Loans	0
Loans held-for-investment, net	3,298	2,133
Real estate loans: | Construction and land | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	1,556
2019	1,377
2018	525
2017	2,068
Prior	3,523
Revolving Loans	17,156
Loans held-for-investment, net	26,205	74,351
Real estate loans: | Construction and land | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	1,556
2019	1,377
2018	525
2017	2,068
Prior	3,523
Revolving Loans	17,156
Loans held-for-investment, net	26,205	74,351
Real estate loans: | Construction and land | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment, net		0
Real estate loans: | Construction and land | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment, net		0
Real estate loans: | Home equity and lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	31,485
2020	18,195
2019	12,253
2018	9,150
2017	4,142
Prior	26,798
Revolving Loans	0
Loans held-for-investment, net	102,023	93,137
Real estate loans: | Home equity and lines of credit | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	31,485
2020	18,195
2019	12,156
2018	9,063
2017	4,142
Prior	26,323
Revolving Loans	0
Loans held-for-investment, net	101,364	92,385
Real estate loans: | Home equity and lines of credit | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	301
Revolving Loans	0
Loans held-for-investment, net	301	311
Real estate loans: | Home equity and lines of credit | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	97
2018	87
2017	0
Prior	174
Revolving Loans	0
Loans held-for-investment, net	358	441
Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	95,854
2020	26,382
2019	7,794
2018	4,721
2017	1,165
Prior	15,928
Revolving Loans	1,876
Loans held-for-investment, net	153,720	191,481
Commercial and industrial loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	95,854
2020	25,987
2019	7,399
2018	4,089
2017	1,027
Prior	14,882
Revolving Loans	1,876
Loans held-for-investment, net	151,114	189,372
Commercial and industrial loans | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	279
2018	235
2017	138
Prior	253
Revolving Loans	0
Loans held-for-investment, net	905	498
Commercial and industrial loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	395
2019	116
2018	397
2017	0
Prior	793
Revolving Loans	0
Loans held-for-investment, net	1,701	1,611
Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	1,929
2020	165
2019	25
2018	33
2017	4
Prior	99
Revolving Loans	0
Loans held-for-investment, net	2,255	3,029
Other loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	1,929
2020	165
2019	25
2018	33
2017	4
Prior	99
Revolving Loans	0
Loans held-for-investment, net	$ 2,255	3,026
Other loans | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment, net		0
Other loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment, net		$ 3

Loans - Investment of Originate

Loans - Investment of Originated Loans Held-for-Investment by Loan Type and Credit Quality Indicator (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	$ 3,816,959	$ 3,823,238
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	3,800,905	3,804,720
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	3,644,930	3,610,210
Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	153,720	191,481
Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	2,255	3,029
Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net		3,731,891
Pass | Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	151,114	189,372
Pass | Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	2,255	3,026
Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net		24,145
Special Mention | Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	905	498
Special Mention | Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net		0
Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net		48,684
Substandard | Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	1,701	1,611
Substandard | Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net		3
Multifamily | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	2,546,296	2,512,934
Multifamily | Pass | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	2,529,342	2,497,556
Multifamily | Special Mention | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	429	458
Multifamily | Substandard | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	16,525	14,920
Commercial mortgage | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	783,355	717,566
Commercial mortgage | Pass | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	755,287	667,568
Commercial mortgage | Special Mention | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	5,750	20,422
Commercial mortgage | Substandard | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	22,318	29,576
One-to-Four Family | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	187,051	212,222
One-to-Four Family | Pass | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	180,856	207,633
One-to-Four Family | Special Mention | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	2,897	2,456
One-to-Four Family | Substandard | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	3,298	2,133
Construction and land | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	26,205	74,351
Construction and land | Pass | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	26,205	74,351
Construction and land | Special Mention | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net		0
Construction and land | Substandard | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net		0
Home equity and lines of credit | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	102,023	93,137
Home equity and lines of credit | Pass | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	101,364	92,385
Home equity and lines of credit | Special Mention | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	301	311
Home equity and lines of credit | Substandard | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans held-for-investment, net	$ 358	$ 441

Loans - Narrative, Past Due and

Loans - Narrative, Past Due and Non-Accrual Loans (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Receivables [Abstract]
Non-accrual loans	$ 7,245,000	$ 8,500,000
Criteria days for delinquent status	90 days	90 days
Principal balance of loans on non accrual status, less then	$ 500,000
Impairment of loans	4,300,000	$ 5,500,000
Loans on non accrual status with principal balances below threshold definition of an impaired loan	2,900,000	3,000,000
90 days or more past due and accruing	272,000	1,100,000
Loans held-for-sale	$ 0	$ 19,895,000

Loans - Details and Delinquency

Loans - Details and Delinquency Status Of Nonperforming Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	$ 3,816,959	$ 3,823,238
Non-accrual loans	7,245	8,500
90 Days or More Past Due and Accruing	272	1,100
Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	4,867
Real estate loans: | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	314
Real estate loans: | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	1,903
Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	126
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	35
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	7,517	9,629
Non-accrual loans	7,245	8,516
90 Days or More Past Due and Accruing	272	1,113
Non-Performing Loans | Real estate loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	7,482	9,153
Non-accrual loans	7,210	8,479
90 Days or More Past Due and Accruing	272	674
Non-Performing Loans | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	5,073	6,729
Non-accrual loans	4,867	6,229
90 Days or More Past Due and Accruing	206	500
Non-Performing Loans | Real estate loans: | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	374	1,080
Non-accrual loans	314	906
90 Days or More Past Due and Accruing	60	174
Non-Performing Loans | Real estate loans: | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,903	1,153
Non-accrual loans	1,903	1,153
90 Days or More Past Due and Accruing	0	0
Non-Performing Loans | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	132	191
Non-accrual loans	126	191
90 Days or More Past Due and Accruing	6	0
Non-Performing Loans | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	35	473
Non-accrual loans	35	37
90 Days or More Past Due and Accruing	0	436
Non-Performing Loans | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		3
Non-accrual loans		0
90 Days or More Past Due and Accruing		3
Non-Performing Loans | Substandard | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	5,073	6,229
Non-accrual loans	4,867	6,229
90 Days or More Past Due and Accruing	206	0
Non-Performing Loans | Substandard | Real estate loans: | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	374	1,080
Non-accrual loans	314	906
90 Days or More Past Due and Accruing	60	174
Non-Performing Loans | Substandard | Real estate loans: | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,903	1,153
Non-accrual loans	1,903	1,153
90 Days or More Past Due and Accruing	0	0
Non-Performing Loans | Substandard | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	126	191
Non-accrual loans	126	191
90 Days or More Past Due and Accruing	0	0
Non-Performing Loans | Substandard | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	35	287
Non-accrual loans	35	37
90 Days or More Past Due and Accruing	0	250
Non-Performing Loans | Pass | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		500
Non-accrual loans		0
90 Days or More Past Due and Accruing		500
Non-Performing Loans | Pass | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	6
Non-accrual loans	0
90 Days or More Past Due and Accruing	6
Non-Performing Loans | Pass | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		101
Non-accrual loans		0
90 Days or More Past Due and Accruing		101
Non-Performing Loans | Pass | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		3
Non-accrual loans		0
90 Days or More Past Due and Accruing		3
Non-Performing Loans | Special Mention | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		85
Non-accrual loans		0
90 Days or More Past Due and Accruing		85
Non-Performing Loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,907	3,302
Non-Performing Loans | Current | Real estate loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,907	3,302
Non-Performing Loans | Current | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,907	2,829
Non-Performing Loans | Current | Real estate loans: | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	413
Non-Performing Loans | Current | Real estate loans: | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Non-Performing Loans | Current | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	60
Non-Performing Loans | Current | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Non-Performing Loans | Current | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | Current | Substandard | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,907	2,829
Non-Performing Loans | Current | Substandard | Real estate loans: | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	413
Non-Performing Loans | Current | Substandard | Real estate loans: | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Non-Performing Loans | Current | Substandard | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	60
Non-Performing Loans | Current | Substandard | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Non-Performing Loans | Current | Pass | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | Current | Pass | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0
Non-Performing Loans | Current | Pass | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | Current | Pass | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | Current | Special Mention | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	108	537
Non-Performing Loans | 30-89 Days Past Due | Real estate loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	73	537
Non-Performing Loans | 30-89 Days Past Due | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	73	537
Non-Performing Loans | 30-89 Days Past Due | Real estate loans: | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Real estate loans: | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	35	0
Non-Performing Loans | 30-89 Days Past Due | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | 30-89 Days Past Due | Substandard | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	73	537
Non-Performing Loans | 30-89 Days Past Due | Substandard | Real estate loans: | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Substandard | Real estate loans: | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Substandard | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Non-Performing Loans | 30-89 Days Past Due | Substandard | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	35	0
Non-Performing Loans | 30-89 Days Past Due | Pass | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | 30-89 Days Past Due | Pass | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0
Non-Performing Loans | 30-89 Days Past Due | Pass | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | 30-89 Days Past Due | Pass | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | 30-89 Days Past Due | Special Mention | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	4,230	4,677
Non-Performing Loans | 90 Days or More Past Due | Real estate loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	4,230	4,640
Non-Performing Loans | 90 Days or More Past Due | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,887	2,863
Non-Performing Loans | 90 Days or More Past Due | Real estate loans: | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	314	493
Non-Performing Loans | 90 Days or More Past Due | Real estate loans: | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,903	1,153
Non-Performing Loans | 90 Days or More Past Due | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	126	131
Non-Performing Loans | 90 Days or More Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	37
Non-Performing Loans | 90 Days or More Past Due | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | 90 Days or More Past Due | Substandard | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,887	2,863
Non-Performing Loans | 90 Days or More Past Due | Substandard | Real estate loans: | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	314	493
Non-Performing Loans | 90 Days or More Past Due | Substandard | Real estate loans: | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,903	1,153
Non-Performing Loans | 90 Days or More Past Due | Substandard | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	126	131
Non-Performing Loans | 90 Days or More Past Due | Substandard | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	37
Non-Performing Loans | 90 Days or More Past Due | Pass | Real estate loans: | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | 90 Days or More Past Due | Pass | Real estate loans: | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	$ 0
Non-Performing Loans | 90 Days or More Past Due | Pass | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | 90 Days or More Past Due | Pass | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Non-Performing Loans | 90 Days or More Past Due | Special Mention | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		$ 0

Loans - Loans Held-for-Invest_2

Loans - Loans Held-for-Investment by Performing and Non-Performing Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	$ 3,816,959	$ 3,823,238
90 Days or More Past Due and Accruing	272	1,100
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	3,800,905	3,804,720
90 Days or More Past Due and Accruing	272	1,113
Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		3,731,891
Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		24,145
Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		48,684
Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	3,644,930	3,610,210
90 Days or More Past Due and Accruing	272	674
Real estate loans: | Commercial mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	783,355	717,566
90 Days or More Past Due and Accruing	206	500
Real estate loans: | Commercial mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	755,287	667,568
90 Days or More Past Due and Accruing	0	500
Real estate loans: | Commercial mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	5,750	20,422
90 Days or More Past Due and Accruing	0	0
Real estate loans: | Commercial mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	22,318	29,576
90 Days or More Past Due and Accruing	206	0
Real estate loans: | One-to-four family residential mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	187,051	212,222
90 Days or More Past Due and Accruing	60	174
Real estate loans: | One-to-four family residential mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	180,856	207,633
90 Days or More Past Due and Accruing	0	0
Real estate loans: | One-to-four family residential mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,897	2,456
90 Days or More Past Due and Accruing	0	0
Real estate loans: | One-to-four family residential mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	3,298	2,133
90 Days or More Past Due and Accruing	60	174
Real estate loans: | Construction and land | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	26,205	74,351
90 Days or More Past Due and Accruing	0	0
Real estate loans: | Construction and land | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	26,205	74,351
90 Days or More Past Due and Accruing	0	0
Real estate loans: | Construction and land | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Real estate loans: | Construction and land | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Real estate loans: | Multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,546,296	2,512,934
90 Days or More Past Due and Accruing	0	0
Real estate loans: | Multifamily | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,529,342	2,497,556
90 Days or More Past Due and Accruing	0	0
Real estate loans: | Multifamily | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	429	458
90 Days or More Past Due and Accruing	0	0
Real estate loans: | Multifamily | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	16,525	14,920
90 Days or More Past Due and Accruing	0	0
Real estate loans: | Home equity and lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	102,023	93,137
90 Days or More Past Due and Accruing	6	0
Real estate loans: | Home equity and lines of credit | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	101,364	92,385
90 Days or More Past Due and Accruing	6	0
Real estate loans: | Home equity and lines of credit | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	301	311
90 Days or More Past Due and Accruing	0	0
Real estate loans: | Home equity and lines of credit | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	358	441
90 Days or More Past Due and Accruing	0	0
Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	153,720	191,481
90 Days or More Past Due and Accruing	0	436
Commercial and industrial loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	151,114	189,372
90 Days or More Past Due and Accruing	0	101
Commercial and industrial loans | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	905	498
90 Days or More Past Due and Accruing	0	85
Commercial and industrial loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,701	1,611
90 Days or More Past Due and Accruing	0	250
Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,255	3,029
90 Days or More Past Due and Accruing	0	3
Other loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,255	3,026
90 Days or More Past Due and Accruing	0	3
Other loans | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Other loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		3
90 Days or More Past Due and Accruing		0
30-89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	8,402	14,519
30-89 Days Past Due | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	6,565	13,748
30-89 Days Past Due | Real estate loans: | Commercial mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,804	9,329
30-89 Days Past Due | Real estate loans: | Commercial mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	346	6,072
30-89 Days Past Due | Real estate loans: | Commercial mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	72
30-89 Days Past Due | Real estate loans: | Commercial mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,458	3,185
30-89 Days Past Due | Real estate loans: | One-to-four family residential mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,094	1,152
30-89 Days Past Due | Real estate loans: | One-to-four family residential mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	374	282
30-89 Days Past Due | Real estate loans: | One-to-four family residential mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	560	870
30-89 Days Past Due | Real estate loans: | One-to-four family residential mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	160	0
30-89 Days Past Due | Real estate loans: | Construction and land | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	994
30-89 Days Past Due | Real estate loans: | Construction and land | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	994
30-89 Days Past Due | Real estate loans: | Multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	3,310	1,893
30-89 Days Past Due | Real estate loans: | Multifamily | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,109	1,283
30-89 Days Past Due | Real estate loans: | Multifamily | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
30-89 Days Past Due | Real estate loans: | Multifamily | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,201	610
30-89 Days Past Due | Real estate loans: | Home equity and lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	357	380
30-89 Days Past Due | Real estate loans: | Home equity and lines of credit | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	64	80
30-89 Days Past Due | Real estate loans: | Home equity and lines of credit | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	196	200
30-89 Days Past Due | Real estate loans: | Home equity and lines of credit | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	97	100
30-89 Days Past Due | Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,831	760
30-89 Days Past Due | Commercial and industrial loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,702	632
30-89 Days Past Due | Commercial and industrial loans | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	94	61
30-89 Days Past Due | Commercial and industrial loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	35	67
30-89 Days Past Due | Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	6	11
30-89 Days Past Due | Other loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	6	11
30-89 Days Past Due | Other loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
90 Days or More Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	4,230	4,677
90 Days or More Past Due | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	4,230	4,640
90 Days or More Past Due | Real estate loans: | Commercial mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,887	2,863
90 Days or More Past Due | Real estate loans: | Commercial mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Real estate loans: | Commercial mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Real estate loans: | Commercial mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,887	2,863
90 Days or More Past Due | Real estate loans: | One-to-four family residential mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	314	493
90 Days or More Past Due | Real estate loans: | One-to-four family residential mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Real estate loans: | One-to-four family residential mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Real estate loans: | One-to-four family residential mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	314	493
90 Days or More Past Due | Real estate loans: | Construction and land | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Real estate loans: | Construction and land | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Real estate loans: | Multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,903	1,153
90 Days or More Past Due | Real estate loans: | Multifamily | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Real estate loans: | Multifamily | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Real estate loans: | Multifamily | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,903	1,153
90 Days or More Past Due | Real estate loans: | Home equity and lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	126	131
90 Days or More Past Due | Real estate loans: | Home equity and lines of credit | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Real estate loans: | Home equity and lines of credit | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Real estate loans: | Home equity and lines of credit | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	126	131
90 Days or More Past Due | Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	37
90 Days or More Past Due | Commercial and industrial loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Commercial and industrial loans | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Commercial and industrial loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	37
90 Days or More Past Due | Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Other loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
90 Days or More Past Due | Other loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Total Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	12,904	20,309
Total Past Due | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	11,067	19,062
Total Past Due | Real estate loans: | Commercial mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	3,897	12,692
Total Past Due | Real estate loans: | Commercial mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	346	6,572
Total Past Due | Real estate loans: | Commercial mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	72
Total Past Due | Real estate loans: | Commercial mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	3,551	6,048
Total Past Due | Real estate loans: | One-to-four family residential mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,468	1,819
Total Past Due | Real estate loans: | One-to-four family residential mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	374	282
Total Past Due | Real estate loans: | One-to-four family residential mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	560	870
Total Past Due | Real estate loans: | One-to-four family residential mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	534	667
Total Past Due | Real estate loans: | Construction and land | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	994
Total Past Due | Real estate loans: | Construction and land | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	994
Total Past Due | Real estate loans: | Multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	5,213	3,046
Total Past Due | Real estate loans: | Multifamily | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,109	1,283
Total Past Due | Real estate loans: | Multifamily | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	0	0
Total Past Due | Real estate loans: | Multifamily | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	4,104	1,763
Total Past Due | Real estate loans: | Home equity and lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	489	511
Total Past Due | Real estate loans: | Home equity and lines of credit | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	70	80
Total Past Due | Real estate loans: | Home equity and lines of credit | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	196	200
Total Past Due | Real estate loans: | Home equity and lines of credit | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	223	231
Total Past Due | Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,831	1,233
Total Past Due | Commercial and industrial loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,702	733
Total Past Due | Commercial and industrial loans | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	94	146
Total Past Due | Commercial and industrial loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	35	354
Total Past Due | Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	6	14
Total Past Due | Other loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	6	14
Total Past Due | Other loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		0
Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	3,788,001	3,784,411
Current | Real estate loans: | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	3,633,863	3,591,148
Current | Real estate loans: | Commercial mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	779,458	704,874
Current | Real estate loans: | Commercial mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	754,941	660,996
Current | Real estate loans: | Commercial mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	5,750	20,350
Current | Real estate loans: | Commercial mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	18,767	23,528
Current | Real estate loans: | One-to-four family residential mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	185,583	210,403
Current | Real estate loans: | One-to-four family residential mortgage | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	180,482	207,351
Current | Real estate loans: | One-to-four family residential mortgage | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,337	1,586
Current | Real estate loans: | One-to-four family residential mortgage | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,764	1,466
Current | Real estate loans: | Construction and land | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	26,205	73,357
Current | Real estate loans: | Construction and land | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	26,205	73,357
Current | Real estate loans: | Multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,541,083	2,509,888
Current | Real estate loans: | Multifamily | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,528,233	2,496,273
Current | Real estate loans: | Multifamily | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	429	458
Current | Real estate loans: | Multifamily | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	12,421	13,157
Current | Real estate loans: | Home equity and lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	101,534	92,626
Current | Real estate loans: | Home equity and lines of credit | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	101,294	92,305
Current | Real estate loans: | Home equity and lines of credit | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	105	111
Current | Real estate loans: | Home equity and lines of credit | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	135	210
Current | Commercial and industrial loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	151,889	190,248
Current | Commercial and industrial loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	149,412	188,639
Current | Commercial and industrial loans | Special Mention | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	811	352
Current | Commercial and industrial loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	1,666	1,257
Current | Other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	2,249	3,015
Current | Other loans | Pass | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net	$ 2,249	3,012
Current | Other loans | Substandard | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held-for-investment, net		$ 3

Loans - Non-Accrual Loans, Excl

Loans - Non-Accrual Loans, Excluding PCD Loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	$ 7,245	$ 7,245	$ 8,500
Unpaid Principal Balance	8,367	8,367
With No Related Allowance	4,277	4,277
Interest Income	51	146
Real estate loans: | Commercial mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	4,867	4,867
Unpaid Principal Balance	5,377	5,377
With No Related Allowance	3,759	3,759
Interest Income	17	67
Real estate loans: | One-to-Four Family
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	314	314
Unpaid Principal Balance	346	346
With No Related Allowance	0	0
Interest Income	4	10
Real estate loans: | Multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	1,903	1,903
Unpaid Principal Balance	1,912	1,912
With No Related Allowance	516	516
Interest Income	27	60
Real estate loans: | Home equity and lines of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	126	126
Unpaid Principal Balance	375	375
With No Related Allowance	0	0
Interest Income	0	2
Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	35	35
Unpaid Principal Balance	357	357
With No Related Allowance	2	2
Interest Income	$ 3	$ 7

Loans - Summary of Impaired Loa

Loans - Summary of Impaired Loans (Details) $ in Thousands	Dec. 31, 2020USD ($)
Recorded Investment
With No Allowance Recorded	$ 7,800
Total	13,242
Unpaid Principal Balance
Total	15,512
Related Allowance	(73)
Real estate loans:
Recorded Investment
With No Allowance Recorded	11,382
With a Related Allowance Recorded	1,844
Unpaid Principal Balance
With No Allowance Recorded	13,220
With a Related Allowance Recorded	2,276
Related Allowance	(69)
Real estate loans: | Commercial mortgage
Recorded Investment
With No Allowance Recorded	8,838
With a Related Allowance Recorded	1,812
Total	10,650
Unpaid Principal Balance
With No Allowance Recorded	10,076
With a Related Allowance Recorded	2,244
Total	12,320
Related Allowance	(66)
Real estate loans: | One-to-four family residential mortgage
Recorded Investment
With No Allowance Recorded	1,903
Total	1,903
Unpaid Principal Balance
With No Allowance Recorded	2,032
Total	2,032
Related Allowance	0
Real estate loans: | Multifamily
Recorded Investment
With No Allowance Recorded	626
Total	626
Unpaid Principal Balance
With No Allowance Recorded	1,097
Total	1,097
Related Allowance	0
Real estate loans: | Home equity and lines of credit
Recorded Investment
With No Allowance Recorded	15
With a Related Allowance Recorded	32
Total	47
Unpaid Principal Balance
With No Allowance Recorded	15
With a Related Allowance Recorded	32
Total	47
Related Allowance	(3)
Commercial and industrial loans
Recorded Investment
With a Related Allowance Recorded	16
Total	16
Unpaid Principal Balance
With a Related Allowance Recorded	16
Total	16
Related Allowance	$ (4)

Loans - Average Recorded Invest

Loans - Average Recorded Investment and Interest Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Average Recorded Investment
Total	$ 19,687	$ 20,211
Interest Income
Total	110	546
Real estate loans: | Commercial mortgage
Average Recorded Investment
With No Allowance Recorded	12,633	14,415
With a Related Allowance Recorded	4,097	2,514
Total	16,730	16,929
Interest Income
With No Allowance Recorded	50	336
With a Related Allowance Recorded	26	83
Total	76	419
Real estate loans: | One-to-four family residential mortgage
Average Recorded Investment
With No Allowance Recorded	1,920	2,192
With a Related Allowance Recorded	261	131
Total	2,181	2,323
Interest Income
With No Allowance Recorded	23	85
With a Related Allowance Recorded	0	0
Total	23	85
Real estate loans: | Multifamily
Average Recorded Investment
With No Allowance Recorded	672	853
Total	672	853
Interest Income
With No Allowance Recorded	10	40
Total	10	40
Real estate loans: | Home equity and lines of credit
Average Recorded Investment
With No Allowance Recorded	18	19
With a Related Allowance Recorded	32	32
Total	50	51
Interest Income
With No Allowance Recorded	1	1
With a Related Allowance Recorded	0	1
Total	1	2
Commercial and industrial loans
Average Recorded Investment
With No Allowance Recorded	37	38
With a Related Allowance Recorded	17	17
Total	54	55
Interest Income
With No Allowance Recorded	0	0
With a Related Allowance Recorded	0	0
Total	$ 0	$ 0

Loans - Narrative, Collateral-D

Loans - Narrative, Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-dependent impaired loans	$ 9,100	$ 10,200
Real estate loans: | Commercial mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-dependent impaired loans	7,600
Real estate loans: | Multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-dependent impaired loans	1,100
Real estate loans: | One-to-Four Family
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-dependent impaired loans	$ 373

Loans - Narrative, Troubled Deb

Loans - Narrative, Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021USD ($)loanborrower	Sep. 30, 2021USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2021USD ($)loan	Sep. 30, 2021USD ($)borrower	Sep. 30, 2021USD ($)contract	Sep. 30, 2020USD ($)	Sep. 30, 2020loan	Sep. 30, 2020borrower	Sep. 30, 2020contract	Dec. 31, 2020USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Relationships	1			1	1			3	3
Pre-Modification Outstanding Recorded Investment			$ 75				$ 731
Post-Modification Outstanding Recorded Investment			75				731
Net loans held-for-investment	$ 3,778,097	$ 3,778,097	3,778,097	$ 3,778,097	$ 3,778,097	$ 3,778,097					$ 3,785,631
Troubled debt restructurings	$ 10,800	$ 10,800	10,800	$ 10,800	$ 10,800	$ 10,800					$ 12,100
Number of TDR loans restructured that subsequently defaulted (contract) | contract						0				0
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Relationships | loan								1
Pre-Modification Outstanding Recorded Investment							187
Post-Modification Outstanding Recorded Investment							187
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Relationships | loan				1				2
Pre-Modification Outstanding Recorded Investment			75				544
Post-Modification Outstanding Recorded Investment			75				$ 544
Number of contracts | loan	3			3
COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Relationships | borrower					3
Number of contracts | contract										4
Loan modification program, extension for payment deferral period		90 days
Loan modification program, payment deferral period		90 days
Net loans held-for-investment	$ 798	$ 798	$ 798	$ 798	$ 798	$ 798

Allowance for Credit Losses (_3

Allowance for Credit Losses (“ACL”) on Loans - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 37,607	$ 38,862	$ 39,493	$ 38,716	$ 38,520	$ 28,707
Financing receivable, accrued interest receivable		9,500
Individually evaluated for impairment threshold		500
Individually evaluated for impairment	73	$ 32
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	10,353
PCD loan related reserves	$ 6,800

Allowance for Credit Losses (_4

Allowance for Credit Losses (“ACL”) on Loans - Impact of CECL Adoption of Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 38,862	$ 39,493	$ 37,607	$ 38,716	$ 38,520	$ 28,707
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	34,089	34,673	36,726	37,927	37,731	27,918
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	2,601	2,594	1,842	1,774	1,846	1,640
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Other loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	6	7	198	129	176	151
PCD/PCI loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	4,773	4,820	881	789	789	789
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			47,960
Cumulative Effect, Period of Adoption, Adjusted Balance | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			40,267
Cumulative Effect, Period of Adoption, Adjusted Balance | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			2,789
Cumulative Effect, Period of Adoption, Adjusted Balance | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Other loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			10
Cumulative Effect, Period of Adoption, Adjusted Balance | PCD/PCI loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			7,693
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			10,353
Cumulative Effect, Period of Adoption, Adjustment | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			3,541
Cumulative Effect, Period of Adoption, Adjustment | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			947
Cumulative Effect, Period of Adoption, Adjustment | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Other loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			(188)
Cumulative Effect, Period of Adoption, Adjustment | PCD/PCI loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			6,812
Commercial mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss				7,593	6,699	4,891
One-to-Four Family | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	4,407	4,610	207	222	272	180
One-to-Four Family | Cumulative Effect, Period of Adoption, Adjusted Balance | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			5,440
One-to-Four Family | Cumulative Effect, Period of Adoption, Adjustment | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			5,233
Construction and land | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	190	259	1,214	1,135	937	536
Construction and land | Cumulative Effect, Period of Adoption, Adjusted Balance | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			293
Construction and land | Cumulative Effect, Period of Adoption, Adjustment | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			(921)
Multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss				26,647	27,243	20,203
Home equity and lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 642	$ 663	260	$ 427	$ 558	$ 317
Home equity and lines of credit | Cumulative Effect, Period of Adoption, Adjusted Balance | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			679
Home equity and lines of credit | Cumulative Effect, Period of Adoption, Adjustment | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss			$ 419

Allowance for Credit Losses (_5

Allowance for Credit Losses (“ACL”) on Loans - Allowance for Credit Losses for Off-Balance Sheet Credit (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	$ 1,808	$ 808
Provision for credit losses	265	528
Ending balance	2,073	2,073
Cumulative Effect, Period of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	0	737
Cumulative Effect, Period of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	$ 1,808	$ 1,545

Allowance for Credit Losses (_6

Allowance for Credit Losses (“ACL”) on Loans - Amount of Loans Receivable Held-for-Investment and Related Allowances Per Loan Portfolio Segment (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
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 39,493	$ 38,520	$ 37,607	$ 28,707
Charge-offs	(544)	(12)	(2,988)	(703)
Recoveries	61	43	113	443
Provisions (credit)	(148)	165	(6,223)	10,269
Ending balance	38,862	38,716	38,862	38,716
Originated Loans Net
Ending balance: individually evaluated for impairment	32		32		$ 73
Ending balance: collectively evaluated for impairment	38,830		38,830		37,534
Loans held-for-investment, net	3,816,959		3,816,959		3,823,238
Ending balance: individually evaluated for impairment	11,731		11,731		13,242
Ending balance: collectively evaluated for impairment	3,732,281		3,732,281		3,683,461
PPP loans not evaluated for impairment	72,947		72,947		126,535
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			10,353
Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			47,960
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	34,673	37,731	36,726	27,918
Charge-offs	(544)	(12)	(577)	(703)
Recoveries	61	43	113	443
Provisions (credit)	(101)	165	(5,714)	10,269
Ending balance	34,089	37,927	34,089	37,927
Originated Loans Net
Ending balance: individually evaluated for impairment	32		32		73
Ending balance: collectively evaluated for impairment	34,057		34,057		36,653
Loans held-for-investment, net	3,800,905		3,800,905		3,804,720
Ending balance: individually evaluated for impairment	11,731		11,731		13,242
Ending balance: collectively evaluated for impairment	3,716,227		3,716,227		3,664,943
PPP loans not evaluated for impairment	72,947		72,947		126,535
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Originated Loans Net
Loans held-for-investment, net	3,644,930		3,644,930		3,610,210
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial and industrial loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,594	1,846	1,842	1,640
Charge-offs	(541)	0	(553)	(94)
Recoveries	6	1	34	6
Provisions (credit)	542	(73)	331	222
Ending balance	2,601	1,774	2,601	1,774
Originated Loans Net
Ending balance: individually evaluated for impairment	0		0		4
Ending balance: collectively evaluated for impairment	2,601		2,601		1,838
Loans held-for-investment, net	153,720		153,720		191,481
Ending balance: individually evaluated for impairment	13		13		16
Ending balance: collectively evaluated for impairment	80,760		80,760		64,930
PPP loans not evaluated for impairment	72,947		72,947		126,535
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Other loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7	176	198	151
Charge-offs	(3)	0	(3)	0
Recoveries	3	0	5	0
Provisions (credit)	(1)	(47)	(6)	(22)
Ending balance	6	129	6	129
Originated Loans Net
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	6		6		198
Loans held-for-investment, net	2,255		2,255		3,029
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	2,255		2,255		3,029
PPP loans not evaluated for impairment	0		0		0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			3,541
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjustment | Commercial and industrial loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			947
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjustment | Other loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			(188)
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			40,267
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial and industrial loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			2,789
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjusted Balance | Other loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			10
PCD/PCI loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,820	789	881	789
Charge-offs	0	0	(2,411)	0
Recoveries	0	0	0	0
Provisions (credit)	(47)	0	(509)	0
Ending balance	4,773	789	4,773	789
Originated Loans Net
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	4,773		4,773		881
Loans held-for-investment, net	16,054		16,054		18,518
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	16,054		16,054		18,518
PPP loans not evaluated for impairment	0		0		0
PCD/PCI loans | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			6,812
PCD/PCI loans | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			7,693
Commercial and multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	26,540		33,005
Charge-offs	0		0
Recoveries	0		19
Provisions (credit)	(297)		(4,832)
Ending balance	26,243		26,243
Originated Loans Net
Ending balance: individually evaluated for impairment	26		26
Ending balance: collectively evaluated for impairment	26,217		26,217
Loans held-for-investment, net	3,329,651		3,329,651
Ending balance: individually evaluated for impairment	10,091		10,091
Ending balance: collectively evaluated for impairment	3,319,560		3,319,560
PPP loans not evaluated for impairment	0		0
Commercial and multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjustment | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			(1,949)
Commercial and multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjusted Balance | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			31,056
Commercial mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		6,699		4,891
Charge-offs		(12)		(609)
Recoveries		16		411
Provisions (credit)		890		2,900
Ending balance		7,593		7,593
Originated Loans Net
Ending balance: individually evaluated for impairment					66
Ending balance: collectively evaluated for impairment					5,944
Loans held-for-investment, net	783,355		783,355		717,566
Ending balance: individually evaluated for impairment					10,650
Ending balance: collectively evaluated for impairment					706,916
PPP loans not evaluated for impairment					0
Multifamily | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		27,243		20,203
Charge-offs		0		0
Recoveries		0		0
Provisions (credit)		(596)		6,444
Ending balance		26,647		26,647
Originated Loans Net
Ending balance: individually evaluated for impairment					0
Ending balance: collectively evaluated for impairment					26,995
Loans held-for-investment, net	2,546,296		2,546,296		2,512,934
Ending balance: individually evaluated for impairment					626
Ending balance: collectively evaluated for impairment					2,512,308
PPP loans not evaluated for impairment					0
One-to-four family residential mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,610	272	207	180
Charge-offs	0	0	(21)	0
Recoveries	27	0	29	0
Provisions (credit)	(230)	(50)	(1,041)	42
Ending balance	4,407	222	4,407	222
Originated Loans Net
Ending balance: individually evaluated for impairment	3		3		0
Ending balance: collectively evaluated for impairment	4,404		4,404		207
Loans held-for-investment, net	187,051		187,051		212,222
Ending balance: individually evaluated for impairment	1,586		1,586		1,903
Ending balance: collectively evaluated for impairment	185,465		185,465		210,319
PPP loans not evaluated for impairment	0		0		0
One-to-four family residential mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjustment | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			5,233
One-to-four family residential mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjusted Balance | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			5,440
Construction and land | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	259	937	1,214	536
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions (credit)	(69)	198	(103)	599
Ending balance	190	1,135	190	1,135
Originated Loans Net
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	190		190		1,214
Loans held-for-investment, net	26,205		26,205		74,351
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	26,205		26,205		74,351
PPP loans not evaluated for impairment	0		0		0
Construction and land | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjustment | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			(921)
Construction and land | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjusted Balance | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			293
Home equity and lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	663	558	260	317
Charge-offs	0	0	0	0
Recoveries	25	26	26	26
Provisions (credit)	(46)	(157)	(63)	84
Ending balance	642	$ 427	642	$ 427
Originated Loans Net
Ending balance: individually evaluated for impairment	3		3		3
Ending balance: collectively evaluated for impairment	639		639		257
Loans held-for-investment, net	102,023		102,023		93,137
Ending balance: individually evaluated for impairment	41		41		47
Ending balance: collectively evaluated for impairment	101,982		101,982		93,090
PPP loans not evaluated for impairment	$ 0		0		$ 0
Home equity and lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjustment | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			419
Home equity and lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Cumulative Effect, Period of Adoption, Adjusted Balance | Real estate loans:
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			$ 679

Deposits - Deposit Account Bala

Deposits - Deposit Account Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deposits [Abstract]
Non-interest-bearing checking	$ 869,008	$ 695,831
NOW and interest-bearing checking	1,056,876	905,208
Savings and money market	1,807,529	1,953,885
Certificates of deposit	407,967	521,627
Total deposits	$ 4,141,380	$ 4,076,551

Deposits - Interest Expense On

Deposits - Interest Expense On Deposits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Deposits [Abstract]
NOW and interest-bearing checking, savings, and money market	$ 671	$ 2,023	$ 2,448	$ 8,990
Certificates of deposit	749	3,620	2,513	13,405
Total interest expense on deposit accounts	$ 1,420	$ 5,643	$ 4,961	$ 22,395

Equity Incentive Plans - Stock

Equity Incentive Plans - Stock Options Outstanding (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021$ / sharesshares	Dec. 31, 2020$ / sharesshares
Number of Stock Options
Beginning Balance (shares) | shares	2,214,193
Forfeited (shares) | shares	(41,090)
Exercised (in shares) | shares	(262,801)
Ending Balance (shares) | shares	1,910,302	2,214,193
Exercisable (shares) | shares	1,893,223
Weighted Average Grant Date Fair Value
Beginning Balance (usd per share)	$ 4.01
Forfeited (usd per share)	3.96
Exercised (usd per share)	3.93
Ending Balance (usd per share)	4.02	$ 4.01
Exercisable (usd per share)	4.02
Weighted Average Exercise Price
Beginning Balance (usd per share)	13.94
Forfeited (usd per share)	13.62
Exercised (usd per share)	13.56
Ending Balance (usd per share)	14	$ 13.94
Exercisable (usd per share)	$ 13.98
Weighted Average Contractual Life (years)
Outstanding	3 years 3 months	3 years 11 months 15 days
Exercisable	3 years 3 months

Equity Incentive Plans - Narrat

Equity Incentive Plans - Narrative (Details) - USD ($)	Jan. 29, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)				176,930
Allocated share-based compensation expense		$ 248,000	$ 217,000	$ 752,000	$ 1,100,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected future stock-based compensation expense		5,000		$ 5,000
Average period of expected future stock option expense				1 month 17 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected future stock-based compensation expense		$ 2,000,000		$ 2,000,000
Average period of expected future stock option expense				3 years 6 months
Two Thousand Nineteen Equity Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	147,315
Grant date value	$ 1,800,000
Two Thousand Nineteen Equity Incentive Plan | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	29,615
Grant date value	$ 366,041
Award vesting period	3 years
Vesting Period One | Two Thousand Nineteen Equity Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	32,769
Award vesting period	1 year
Vesting Period Two | Two Thousand Nineteen Equity Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	114,546
Award vesting period	5 years
Period after grant date to begin vesting period	1 year
Minimum | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares issuable based on threshold performance	0.00%
Maximum | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares issuable based on threshold performance	225.00%

Equity Incentive Plans - Status

Equity Incentive Plans - Status of the Company's Restricted Share Awards (Details)	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Number of Shares Awarded
Beginning Balance (shares) | shares	104,010
Granted (shares) | shares	176,930
Vested (shares) | shares	(38,470)
Forfeited (shares) | shares	(14,138)
Ending Balance (shares) | shares	228,332
Weighted Average Grant Date Fair Value
Beginning Balance (in dollars per share) | $ / shares	$ 15.91
Granted (in dollars per share) | $ / shares	12.59
Vested (in dollars per share) | $ / shares	15.81
Forfeited (in dollars per share) | $ / shares	13.86
Ending Balance (in dollars per share) | $ / shares	$ 13.48

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	$ 1,084,811	$ 1,264,805
Trading securities	12,761	12,291
Individually evaluated loans	4,280	5,325
Investment measured at fair value	5,000
Measured on a recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	1,084,811	1,264,805
Trading securities	12,761	12,291
Equity securities	215	253
Total	1,097,787	1,277,349
Measured on a recurring basis | U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	2,327	3,158
Measured on a recurring basis | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	923,313	1,172,312
Measured on a recurring basis | Pass-through certificates, GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	363,100	281,343
Measured on a recurring basis | REMICs, GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	560,213	890,965
Measured on a recurring basis | Non-GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale		4
Measured on a recurring basis | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	78	123
Measured on a recurring basis | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	159,093	88,418
Measured on a recurring basis | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale		794
Measured on a recurring basis | Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	159,171	89,335
Measured on a 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]
Debt securities available-for-sale	0	0
Trading securities	12,761	12,291
Equity securities	215	253
Total	12,976	12,544
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pass-through certificates, GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | REMICs, GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale		0
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale		0
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	1,084,811	1,264,805
Trading securities	0	0
Equity securities	0	0
Total	1,084,811	1,264,805
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	2,327	3,158
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	923,313	1,172,312
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Pass-through certificates, GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	363,100	281,343
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | REMICs, GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	560,213	890,965
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Non-GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale		4
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	78	123
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	159,093	88,418
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale		794
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	159,171	89,335
Measured on a recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Trading securities	0	0
Equity securities	0	0
Total	0	0
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Pass-through certificates, GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | REMICs, GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Non-GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale		0
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale		0
Measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	0	0
Measured on a non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	4,380	5,325
Measured on a non-recurring basis | Real estate loans:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	4,267	5,312
Measured on a non-recurring basis | Real estate loans: | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	3,745	5,268
Measured on a non-recurring basis | Real estate loans: | One-to-Four Family
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	488
Measured on a non-recurring basis | Real estate loans: | Multifamily
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	6	16
Measured on a non-recurring basis | Real estate loans: | Home equity and lines of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	28	28
Measured on a non-recurring basis | Commercial and industrial loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	13	13
Measured on a non-recurring basis | Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	100
Measured on a 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]
Total	0	0
Measured on a non-recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate loans:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0	0
Measured on a non-recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate loans: | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0	0
Measured on a non-recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate loans: | One-to-Four Family
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0
Measured on a non-recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate loans: | Multifamily
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0	0
Measured on a non-recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate loans: | Home equity and lines of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0	0
Measured on a non-recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial and industrial loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0	0
Measured on a non-recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0
Measured on a non-recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	0	0
Measured on a non-recurring basis | Significant Other Observable Inputs (Level 2) | Real estate loans:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0	0
Measured on a non-recurring basis | Significant Other Observable Inputs (Level 2) | Real estate loans: | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0	0
Measured on a non-recurring basis | Significant Other Observable Inputs (Level 2) | Real estate loans: | One-to-Four Family
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0
Measured on a non-recurring basis | Significant Other Observable Inputs (Level 2) | Real estate loans: | Multifamily
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0	0
Measured on a non-recurring basis | Significant Other Observable Inputs (Level 2) | Real estate loans: | Home equity and lines of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0	0
Measured on a non-recurring basis | Significant Other Observable Inputs (Level 2) | Commercial and industrial loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0	0
Measured on a non-recurring basis | Significant Other Observable Inputs (Level 2) | Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	0
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	4,380	5,325
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3) | Real estate loans:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	4,267	5,312
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3) | Real estate loans: | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	3,745	5,268
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3) | Real estate loans: | One-to-Four Family
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	488
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3) | Real estate loans: | Multifamily
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	6	16
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3) | Real estate loans: | Home equity and lines of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	28	28
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3) | Commercial and industrial loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	13	$ 13
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3) | Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	$ 100

Fair Value Measurements - Quali

Fair Value Measurements - Qualitative Information for Level 3 Assets Measured at Fair Value on a Non-Recurring Basis (Details) $ in Thousands	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Individually evaluated loans	$ 4,280	$ 5,325
Other real estate owned	$ 100	$ 0
Appraisals | Discount for costs to sell
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	0.070	0.070
Other real estate owned inputs	0.070
Appraisals | Discount for quick sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	0.100	0.100
Discounted cash flows | Interest rates | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	0.0488	0.0488
Discounted cash flows | Interest rates | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	0.0625	0.0625

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Impaired loans held-for-investment and held-for-sale with outstanding principal balances	$ 6,300		$ 7,400
Estimated fair value of impaired loans held-for-investment and held-for-sale	4,300		$ 5,300
Increase (decrease) in net impairment charges	42	$ 166
Net recoveries (charge offs)	2,900	260
Assets acquired through foreclosure	$ 100	$ 0

Fair Value Measurements - Estim

Fair Value Measurements - Estimated Fair Values of the Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets:
Trading securities	$ 12,761	$ 12,291
Debt securities available-for-sale	1,084,811	1,264,805
Debt securities held-to-maturity	6,083	7,574
Loans held-for-sale		19,895
Carrying Value
Financial assets:
Cash and cash equivalents	173,694	87,544
Trading securities	12,761	12,291
Debt securities available-for-sale	1,084,811	1,264,805
Debt securities held-to-maturity	5,811	7,234
Equity securities	215	253
FHLBNY stock, at cost	22,336	28,641
Loans held-for-sale		19,895
Net loans held-for-investment	3,778,097	3,785,631
Derivative assets	865	1,498
Financial liabilities:
Deposits	4,141,380	4,076,551
Borrowed funds	421,804	591,789
Advance payments by borrowers for taxes and insurance	23,496	19,677
Derivative liabilities	865	1,502
Estimated Fair Value
Financial assets:
Cash and cash equivalents	173,694	87,544
Trading securities	12,761	12,291
Debt securities available-for-sale	1,084,811	1,264,805
Debt securities held-to-maturity	6,083	7,574
Equity securities	215	253
FHLBNY stock, at cost	22,336	28,641
Net loans held-for-investment	3,893,911	3,842,054
Derivative assets	865	1,498
Financial liabilities:
Deposits	4,144,981	4,082,538
Borrowed funds	430,730	609,900
Advance payments by borrowers for taxes and insurance	23,496	19,677
Derivative liabilities	867	1,502
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	173,694	87,544
Trading securities	12,761	12,291
Debt securities available-for-sale	0	0
Debt securities held-to-maturity	0	0
Equity securities	215	253
FHLBNY stock, at cost	0	0
Loans held-for-sale		0
Net loans held-for-investment	0	0
Derivative assets	0	0
Financial liabilities:
Deposits	0	0
Borrowed funds	0	0
Advance payments by borrowers for taxes and insurance	0	0
Derivative liabilities	0	0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Trading securities	0	0
Debt securities available-for-sale	1,084,811	1,264,805
Debt securities held-to-maturity	6,083	7,574
Equity securities	0	0
FHLBNY stock, at cost	22,336	28,641
Loans held-for-sale		0
Net loans held-for-investment	0	0
Derivative assets	865	1,498
Financial liabilities:
Deposits	4,144,981	4,082,538
Borrowed funds	430,730	609,900
Advance payments by borrowers for taxes and insurance	23,496	19,677
Derivative liabilities	867	1,502
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Trading securities	0	0
Debt securities available-for-sale	0	0
Debt securities held-to-maturity	0	0
Equity securities	0	0
FHLBNY stock, at cost	0	0
Loans held-for-sale		19,895
Net loans held-for-investment	3,893,911	3,842,054
Derivative assets	0	0
Financial liabilities:
Deposits	0	0
Borrowed funds	0	0
Advance payments by borrowers for taxes and insurance	0	0
Derivative liabilities	$ 0	$ 0

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 available to common stockholders	$ 16,080	$ 8,582	$ 54,551	$ 23,926
Weighted average shares outstanding-basic (shares)	48,095,473	50,707,691	48,838,396	48,131,005
Effect of non-vested restricted stock and stock options outstanding (shares)	390,623	12,112	298,641	79,276
Weighted average shares outstanding-diluted (shares)	48,486,096	50,719,803	49,137,037	48,210,281
Earnings per share-basic (usd per share)	$ 0.33	$ 0.17	$ 1.12	$ 0.50
Earnings per share-diluted (usd per share)	$ 0.33	$ 0.17	$ 1.11	$ 0.50
Anti-dilutive shares (shares)	125,744	2,287,010	417,955	1,868,511

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 35,063	$ 36,741
Operating lease liabilities	$ 41,090	$ 42,734
Minimum
Lessee, Lease, Description [Line Items]
Renewal term	5 years
Maximum
Lessee, Lease, Description [Line Items]
Term of lease	33 years 9 months
Renewal term	10 years

Leases - Supplemental Lease Inf

Leases - Supplemental Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease cost	$ 1,409	$ 2,073	$ 4,317	$ 4,935
Variable lease cost	974	878	3,219	2,378
Net lease cost	2,383	2,951	7,536	7,313
Cash paid for amounts included in measurement of operating lease liabilities	1,568	2,111	4,967	5,180
Right-of-use assets obtained in exchange for new lease liabilities	$ 1,596	$ 0	$ 1,596	$ 3,028
Weighted average remaining lease term	11 years 10 months 20 days	12 years 4 months 20 days	11 years 10 months 20 days	12 years 4 months 20 days
Weighted average discount rate	3.55%	3.55%	3.55%	3.55%

Leases - Lease Payments Obligat

Leases - Lease Payments Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
2021	$ 1,571
2022	5,923
2023	5,802
2024	5,372
2025	5,024
Thereafter	28,382
Total lease payments	52,074
Less: imputed interest	10,984
Present value of lease liabilities	$ 41,090	$ 42,734

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 fees and service charges for customer services	$ 1,370	$ 1,009	$ 3,894	$ 2,795
Income on bank-owned life insurance	862	894	2,567	2,635
Gains on available-for-sale debt securities, net	370	45	976	105
(Losses)/gains on trading securities, net	(75)	763	1,096	397
Gains on sales of loans	0	0	1,401	665
Swap income	0	307	0	691
Other	101	4	246	81
Total non-interest income	2,628	3,022	10,180	7,369
Service charges
Disaggregation of Revenue [Line Items]
Total fees and service charges for customer services	763	565	2,173	1,674
ATM and card interchange fees
Disaggregation of Revenue [Line Items]
Total fees and service charges for customer services	515	351	1,397	930
Investment fees
Disaggregation of Revenue [Line Items]
Total fees and service charges for customer services	$ 92	$ 93	$ 324	$ 191

Derivatives - Additional Inform

Derivatives - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)instrument	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)instrument	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)instrument
Derivative [Line Items]
Swap income	$ 0	$ 307	$ 0	$ 691
Interest Rate Swap
Derivative [Line Items]
Number of derivative instruments held | instrument	7		7		7
Derivative, notional amount	$ 38,400		$ 38,400		$ 39,200

Derivatives - Fair Value of Der

Derivatives - Fair Value of Derivatives (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other assets
Derivative [Line Items]
Fair value of derivative asset	$ 865	$ 1,498
Other liabilities
Derivative [Line Items]
Fair value of derivative liability	$ 867	$ 1,502

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements Adopted (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 37,607	$ 38,862	$ 39,493	$ 38,716	$ 38,520	$ 28,707
Unfounded credit commitment	808	$ 2,073	1,808
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Increase in allowance for credit losses	11,100
Allowance for credit loss	10,353
Unfounded credit commitment	737		$ 0
PCD loan related reserves	6,800
Non-PCD loan related reserves	$ 4,300