Loans Receivable, Net and Allowance for Credit Losses - Summary of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	$ 2,482,206		$ 2,308,020	$ 2,045,089
Net deferred loan origination costs	606		1,081
Allowance for Credit Losses	(24,100)	$ (22,974)	(22,502)	(24,061)	$ (24,664)	$ (26,154)
Loans receivable, net	2,458,712		2,286,599
1-4 Family Residential Investor Owned
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	317,488		330,053	337,292
Allowance for Credit Losses	(2,601)	(3,307)	(4,148)	(4,188)	(4,257)	(4,415)
1-4 Family Residential Owner-Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	134,862		142,363	147,485
Allowance for Credit Losses	(1,082)	(1,194)	(1,784)	(1,946)	(1,963)	(2,012)
Multifamily Residential
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	693,670		670,159	545,323
Allowance for Credit Losses	(8,863)	(7,840)	(5,004)	(4,185)	(4,214)	(4,365)
Nonresidential Properties
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	404,512		389,898	337,583
Allowance for Credit Losses	(3,294)	(2,997)	(2,697)	(2,297)	(2,236)	(3,176)
Construction and Land
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	883,462		733,660	641,879
Allowance for Credit Losses	(6,895)	(6,646)	(7,710)	(6,796)	(6,403)	(4,807)
Business Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	47,372		40,849	30,222
Allowance for Credit Losses	(1,345)	(947)	(1,113)	(987)	(561)	(531)
Consumer Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	840		1,038	5,305
Allowance for Credit Losses	(20)	$ (43)	(46)	$ (3,662)	$ (5,030)	$ (6,848)
Mortgage Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	2,433,994		2,266,133
Mortgage Loans | 1-4 Family Residential Investor Owned
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	317,488		330,053
Mortgage Loans | 1-4 Family Residential Owner-Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	134,862		142,363
Mortgage Loans | Multifamily Residential
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	693,670		670,159
Mortgage Loans | Nonresidential Properties
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	404,512		389,898
Mortgage Loans | Construction and Land
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	883,462		733,660
Non-mortgage Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	48,212		41,887
Non-mortgage Loans | Business Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	47,372		40,849
Non-mortgage Loans | Consumer Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans, gross	$ 840		$ 1,038