Loans - Age Analysis of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Total Loans	$ 6,906,713	$ 6,934,769
30 to 59 Days Past Due
Total Loans	10,118	18,456
60 to 89 Days Past Due
Total Loans	4,551	1,803
Greater than 90 Days Past Due
Total Loans	17,252	22,425
Total Past Due
Total Loans	31,921	42,684
Current
Total Loans	6,874,792	6,892,085
Multi-family Residential Portfolio Segment [Member]
Total Loans	2,617,629	2,605,172
Multi-family Residential Portfolio Segment [Member] | 30 to 59 Days Past Due
Total Loans	1,131	1,475
Multi-family Residential Portfolio Segment [Member] | 60 to 89 Days Past Due
Total Loans	599	1,787
Multi-family Residential Portfolio Segment [Member] | Greater than 90 Days Past Due
Total Loans	3,600	3,547
Multi-family Residential Portfolio Segment [Member] | Total Past Due
Total Loans	5,330	6,809
Multi-family Residential Portfolio Segment [Member] | Current
Total Loans	2,612,299	2,598,363
Commercial Real Estate [Member]
Total Loans	1,954,462	1,914,898
Commercial Real Estate [Member] | 30 to 59 Days Past Due
Total Loans	3,994	2,561
Commercial Real Estate [Member] | 60 to 89 Days Past Due
Total Loans	0	0
Commercial Real Estate [Member] | Greater than 90 Days Past Due
Total Loans	0	254
Commercial Real Estate [Member] | Total Past Due
Total Loans	3,994	2,815
Commercial Real Estate [Member] | Current
Total Loans	1,950,468	1,912,083
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Total Loans	540,519	557,295
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | 30 to 59 Days Past Due
Total Loans	1,537	3,721
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | 60 to 89 Days Past Due
Total Loans	195	0
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Greater than 90 Days Past Due
Total Loans	1,090	797
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Total Past Due
Total Loans	2,822	4,518
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Current
Total Loans	537,697	552,777
One-To-Four Family - Residential Portfolio Segment [Member]
Total Loans	224,127	242,480
One-To-Four Family - Residential Portfolio Segment [Member] | 30 to 59 Days Past Due
Total Loans	3,367	2,734
One-To-Four Family - Residential Portfolio Segment [Member] | 60 to 89 Days Past Due
Total Loans	26	0
One-To-Four Family - Residential Portfolio Segment [Member] | Greater than 90 Days Past Due
Total Loans	3,643	3,953
One-To-Four Family - Residential Portfolio Segment [Member] | Total Past Due
Total Loans	7,036	6,687
One-To-Four Family - Residential Portfolio Segment [Member] | Current
Total Loans	217,091	235,793
Construction Portfolio Segment
Total Loans	59,775	70,824
Construction Portfolio Segment | 30 to 59 Days Past Due
Total Loans	0	0
Construction Portfolio Segment | 60 to 89 Days Past Due
Total Loans	0	0
Construction Portfolio Segment | Greater than 90 Days Past Due
Total Loans	0	2,600
Construction Portfolio Segment | Total Past Due
Total Loans	0	2,600
Construction Portfolio Segment | Current
Total Loans	59,775	68,224
Small Business Administration Portfolio Segment [Member]
Total Loans	21,836	23,193
Small Business Administration Portfolio Segment [Member] | 30 to 59 Days Past Due
Total Loans	0	329
Small Business Administration Portfolio Segment [Member] | 60 to 89 Days Past Due
Total Loans	1,494	0
Small Business Administration Portfolio Segment [Member] | Greater than 90 Days Past Due
Total Loans	1,265	950
Small Business Administration Portfolio Segment [Member] | Total Past Due
Total Loans	2,759	1,279
Small Business Administration Portfolio Segment [Member] | Current
Total Loans	19,077	21,914
Commercial Business and Other Portfolio Segment [Member]
Total Loans	1,488,365	1,520,907
Commercial Business and Other Portfolio Segment [Member] | 30 to 59 Days Past Due
Total Loans	89	7,636
Commercial Business and Other Portfolio Segment [Member] | 60 to 89 Days Past Due
Total Loans	2,237	16
Commercial Business and Other Portfolio Segment [Member] | Greater than 90 Days Past Due
Total Loans	7,654	10,324
Commercial Business and Other Portfolio Segment [Member] | Total Past Due
Total Loans	9,980	17,976
Commercial Business and Other Portfolio Segment [Member] | Current
Total Loans	$ 1,478,385	$ 1,502,931