Loans and Allowance for Credit Losses - Risk Category of Mortgage and Non-mortgage Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
2022	$ 1,248,767
2021	779,882
2020	606,642
2019	807,955
2018	866,649
Prior	2,283,871
Revolving Loans Amortized Cost Basis	326,506
Revolving Loans converted to term loans	14,497
Total	6,934,769
Pass [Member]
2022	1,240,231
2021	772,654
2020	598,931
2019	731,423
2018	827,361
Prior	2,153,145
Revolving Loans Amortized Cost Basis	307,681
Revolving Loans converted to term loans	13,190
Total	6,644,616
Watch [Member]
2022	5,592
2021	4,783
2020	2,968
2019	61,258
2018	33,887
Prior	111,135
Revolving Loans Amortized Cost Basis	1,753
Revolving Loans converted to term loans	863
Total	222,239
Special Mention [Member]
2021	2,445
2020	4,743
2019	15,243
2018	2,219
Prior	7,501
Total	32,151
Substandard [Member]
2022	2,944
2019	31
2018	3,182
Prior	12,090
Revolving Loans Amortized Cost Basis	7,030
Revolving Loans converted to term loans	444
Total	25,721
Doubtful [Member]
Revolving Loans Amortized Cost Basis	10,042
Total	10,042
One-To-Four Family - Residential Portfolio Segment [Member]
2022	24,207
2021	8,983
2020	18,657
2019	42,554
2018	24,962
Prior	100,550
Revolving Loans Amortized Cost Basis	8,070
Revolving Loans converted to term loans	14,497
Total	242,480
One-To-Four Family - Residential Portfolio Segment [Member] | Pass [Member]
2022	24,207
2021	8,697
2020	18,657
2019	41,820
2018	24,962
Prior	94,270
Revolving Loans Amortized Cost Basis	8,007
Revolving Loans converted to term loans	13,190
Total	233,810
One-To-Four Family - Residential Portfolio Segment [Member] | Watch [Member]
2021	286
2019	734
Prior	2,419
Revolving Loans Amortized Cost Basis	63
Revolving Loans converted to term loans	863
Total	4,365
One-To-Four Family - Residential Portfolio Segment [Member] | Substandard [Member]
Prior	3,861
Revolving Loans converted to term loans	444
Total	4,305
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
2022	44,988
2021	43,157
2020	33,548
2019	64,706
2018	64,904
Prior	305,992
Total	557,295
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Pass [Member]
2022	44,988
2021	43,157
2020	32,663
2019	63,973
2018	64,904
Prior	297,053
Total	546,738
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Watch [Member]
2020	885
2019	733
Prior	7,246
Total	8,864
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Special Mention [Member]
Prior	719
Total	719
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Substandard [Member]
Prior	974
Total	974
Commercial Real Estate [Member]
2022	330,255
2021	183,460
2020	152,526
2019	241,592
2018	247,423
Prior	759,642
Total	1,914,898
Commercial Real Estate [Member] | Pass [Member]
2022	328,284
2021	181,881
2020	152,526
2019	230,995
2018	240,622
Prior	744,503
Total	1,878,811
Commercial Real Estate [Member] | Watch [Member]
2022	1,971
2021	1,579
2019	10,597
2018	6,801
Prior	10,836
Total	31,784
Commercial Real Estate [Member] | Special Mention [Member]
Prior	4,041
Total	4,041
Commercial Real Estate [Member] | Substandard [Member]
Prior	262
Total	262
Construction Portfolio Segment
2022	1,984
2021	17,555
2020	14,385
2018	6,450
Prior	2,600
Revolving Loans Amortized Cost Basis	27,850
Total	70,824
Construction Portfolio Segment | Pass [Member]
2022	1,984
2021	17,555
2020	14,385
Revolving Loans Amortized Cost Basis	27,850
Total	61,774
Construction Portfolio Segment | Watch [Member]
2018	6,450
Total	6,450
Construction Portfolio Segment | Substandard [Member]
Prior	2,600
Total	2,600
Multi-family Residential Portfolio Segment [Member]
2022	483,513
2021	287,889
2020	226,560
2019	312,681
2018	400,704
Prior	887,710
Revolving Loans Amortized Cost Basis	6,115
Total	2,605,172
Multi-family Residential Portfolio Segment [Member] | Pass [Member]
2022	482,600
2021	287,889
2020	225,106
2019	312,681
2018	393,590
Prior	869,566
Revolving Loans Amortized Cost Basis	6,115
Total	2,577,547
Multi-family Residential Portfolio Segment [Member] | Watch [Member]
2022	913
2020	1,454
2018	3,770
Prior	14,439
Total	20,576
Multi-family Residential Portfolio Segment [Member] | Special Mention [Member]
2018	446
Prior	2,286
Total	2,732
Multi-family Residential Portfolio Segment [Member] | Substandard [Member]
2018	2,898
Prior	1,419
Total	4,317
Commercial Business Secured By Portfolio Segment [member]
2022	185,658
2021	139,748
2020	109,921
2019	83,600
2018	66,857
Prior	145,163
Total	730,947
Commercial Business Secured By Portfolio Segment [member] | Pass [Member]
2022	182,805
2021	139,748
2020	109,292
2019	40,175
2018	66,436
Prior	89,663
Total	628,119
Commercial Business Secured By Portfolio Segment [member] | Watch [Member]
2020	629
2019	28,217
2018	421
Prior	55,500
Total	84,767
Commercial Business Secured By Portfolio Segment [member] | Special Mention [Member]
2019	15,208
Total	15,208
Commercial Business Secured By Portfolio Segment [member] | Substandard [Member]
2022	2,853
Total	2,853
Commercial Business Portfolio Segment [Member]
2022	174,810
2021	93,444
2020	46,741
2019	62,117
2018	52,032
Prior	76,302
Revolving Loans Amortized Cost Basis	284,386
Total	789,832
Commercial Business Portfolio Segment [Member] | Pass [Member]
2022	172,011
2021	88,081
2020	41,998
2019	41,125
2018	35,555
Prior	56,281
Revolving Loans Amortized Cost Basis	265,624
Total	700,675
Commercial Business Portfolio Segment [Member] | Watch [Member]
2022	2,708
2021	2,918
2019	20,926
2018	14,420
Prior	17,823
Revolving Loans Amortized Cost Basis	1,690
Total	60,485
Commercial Business Portfolio Segment [Member] | Special Mention [Member]
2021	2,445
2020	4,743
2019	35
2018	1,773
Prior	416
Total	9,412
Commercial Business Portfolio Segment [Member] | Substandard [Member]
2022	91
2019	31
2018	284
Prior	1,782
Revolving Loans Amortized Cost Basis	7,030
Total	9,218
Commercial Business Portfolio Segment [Member] | Doubtful [Member]
Revolving Loans Amortized Cost Basis	10,042
Total	10,042
Small Business Administration Portfolio Segment [Member]
2022	3,352
2021	5,646
2020	4,304
2019	705
2018	3,317
Prior	5,869
Total	23,193
Small Business Administration Portfolio Segment [Member] | Pass [Member]
2022	3,352
2021	5,646
2020	4,304
2019	654
2018	1,292
Prior	1,766
Total	17,014
Small Business Administration Portfolio Segment [Member] | Watch [Member]
2019	51
2018	2,025
Prior	2,872
Total	4,948
Small Business Administration Portfolio Segment [Member] | Special Mention [Member]
Prior	39
Total	39
Small Business Administration Portfolio Segment [Member] | Substandard [Member]
Prior	1,192
Total	1,192
Other Portfolio Segment [Member]
Prior	43
Revolving Loans Amortized Cost Basis	85
Total	128
Other Portfolio Segment [Member] | Pass [Member]
Prior	43
Revolving Loans Amortized Cost Basis	85
Total	128
Consumer Portfolio Segment [Member]
Mortgage Loans in Process of Foreclosure, Amount	$ 5,200	$ 8,700