Loans and Allowance for Credit Losses - Age Analysis of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Total	$ 6,934,769
Loans, net of fees and costs	6,934,769	$ 6,638,105
Financing Receivables, 30 to 59 Days Past Due [Member]
Total	18,456	11,978
Financing Receivables, 60 to 89 Days Past Due [Member]
Total	1,803	4,457
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total	22,425	14,434
Total Past Due [Member]
Total	42,684	30,869
Current [Member]
Total	6,892,085	6,607,236
Multi-family Residential Portfolio Segment [Member]
Total	2,605,172
Loans, net of fees and costs	2,605,172	2,519,227
Multi-family Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total	1,475	3,652
Multi-family Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total	1,787	4,193
Multi-family Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total	3,547	2,652
Multi-family Residential Portfolio Segment [Member] | Total Past Due [Member]
Total	6,809	10,497
Multi-family Residential Portfolio Segment [Member] | Current [Member]
Total	2,598,363	2,508,730
Commercial Real Estate [Member]
Total	1,914,898
Loans, net of fees and costs	1,914,898	1,777,375
Commercial Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total	2,561	5,743
Commercial Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total	0	0
Commercial Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total	254	640
Commercial Real Estate [Member] | Total Past Due [Member]
Total	2,815	6,383
Commercial Real Estate [Member] | Current [Member]
Total	1,912,083	1,770,992
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Total	557,295
Loans, net of fees and costs	557,295	574,936
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total	3,721	2,319
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total	0	0
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total	797	1,321
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Total Past Due [Member]
Total	4,518	3,640
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Current [Member]
Total	552,777	571,296
One-To-Four Family - Residential Portfolio Segment [Member]
Total	242,480
Loans, net of fees and costs	242,480	277,812
One-To-Four Family - Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total	2,734	163
One-To-Four Family - Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total	0	224
One-To-Four Family - Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total	3,953	7,483
One-To-Four Family - Residential Portfolio Segment [Member] | Total Past Due [Member]
Total	6,687	7,870
One-To-Four Family - Residential Portfolio Segment [Member] | Current [Member]
Total	235,793	269,942
Construction Portfolio Segment
Total	70,824
Loans, net of fees and costs	70,824	59,473
Construction Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due [Member]
Total	0	0
Construction Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due [Member]
Total	0	0
Construction Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total	2,600	0
Construction Portfolio Segment | Total Past Due [Member]
Total	2,600	0
Construction Portfolio Segment | Current [Member]
Total	68,224	59,473
Small Business Administration Portfolio Segment [Member]
Total	23,193
Loans, net of fees and costs	23,193	91,836
Small Business Administration Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total	329	0
Small Business Administration Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total	0	0
Small Business Administration Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total	950	952
Small Business Administration Portfolio Segment [Member] | Total Past Due [Member]
Total	1,279	952
Small Business Administration Portfolio Segment [Member] | Current [Member]
Total	21,914	90,884
Commercial Business and Other Portfolio Segment [Member]
Loans, net of fees and costs	1,520,907	1,337,446
Commercial Business and Other Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Total	7,636	101
Commercial Business and Other Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Total	16	40
Commercial Business and Other Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Total	10,324	1,386
Commercial Business and Other Portfolio Segment [Member] | Total Past Due [Member]
Total	17,976	1,527
Commercial Business and Other Portfolio Segment [Member] | Current [Member]
Total	$ 1,502,931	$ 1,335,919