Loans and Allowance for Credit Losses - Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loans and Allowance for Credit Losses
Balance at beginning of period	$ 60,754	$ 67,338
Provision (credit) charged to expense	3,000	(6,700)	$ 15,871
Losses charged off	(2,169)	(2,621)
Recoveries	1,895	2,737
Balance at end of period	63,480	60,754	67,338
Loans Receivable
Loans and Allowance for Credit Losses
Individually evaluated for impairment			713
Collectively evaluated for impairment			54,350
Loans acquired and accounted for under ASC 310-30			680
Individually evaluated for impairment			9,048
Collectively evaluated for impairment			5,117,838
Loans acquired and accounted for under ASC 310-30			98,643
Loans Receivable | Allowance For Credit Losses
Loans and Allowance for Credit Losses
Balance at beginning of period		55,743	40,294
Provision (credit) charged to expense			15,871
Losses charged off			(3,294)
Recoveries			2,872
Balance at end of period			55,743
Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period	9,629	8,690
Provision (credit) charged to expense	3,187	939
Balance at end of period	12,816	9,629	8,690
CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		11,595
Balance at end of period			11,595
CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			8,690
Before CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		55,743
Balance at end of period			55,743
Before CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			0
One- To Four-Family Residential
Loans and Allowance for Credit Losses
Balance at beginning of period	9,364	9,069
Provision (credit) charged to expense	1,652
Losses charged off	(40)	(190)
Recoveries	195	485
Balance at end of period	11,171	9,364	9,069
Individually evaluated for impairment			90
Collectively evaluated for impairment			4,382
Loans acquired and accounted for under ASC 310-30			64
Individually evaluated for impairment			3,546
Collectively evaluated for impairment			655,146
Loans acquired and accounted for under ASC 310-30			57,113
One- To Four-Family Residential | Allowance For Credit Losses
Loans and Allowance for Credit Losses
Balance at beginning of period		4,536	4,339
Provision (credit) charged to expense			84
Losses charged off			(70)
Recoveries			183
Balance at end of period			4,536
One- To Four-Family Residential | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period	687	917
Provision (credit) charged to expense	49	(230)
Balance at end of period	736	687	917
One- To Four-Family Residential | CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		4,533
Balance at end of period			4,533
One- To Four-Family Residential | CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			917
One- To Four-Family Residential | Before CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		4,536
Balance at end of period			4,536
One- To Four-Family Residential | Before CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			0
Other Residential
Loans and Allowance for Credit Losses
Balance at beginning of period	10,502	15,207
Provision (credit) charged to expense	1,498	(4,797)
Recoveries	110	92
Balance at end of period	12,110	10,502	15,207
Collectively evaluated for impairment			9,282
Loans acquired and accounted for under ASC 310-30			93
Collectively evaluated for impairment			1,021,145
Loans acquired and accounted for under ASC 310-30			6,150
Other Residential | Allowance For Credit Losses
Loans and Allowance for Credit Losses
Balance at beginning of period		9,375	5,153
Provision (credit) charged to expense			4,042
Recoveries			180
Balance at end of period			9,375
Other Residential | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period	5,703	5,227
Provision (credit) charged to expense	2,921	476
Balance at end of period	8,624	5,703	5,227
Other Residential | CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		5,832
Balance at end of period			5,832
Other Residential | CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			5,227
Other Residential | Before CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		9,375
Balance at end of period			9,375
Other Residential | Before CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			0
Commercial Real Estate
Loans and Allowance for Credit Losses
Balance at beginning of period	28,604	31,176
Provision (credit) charged to expense	(1,465)	(2,478)
Losses charged off	(44)	(142)
Recoveries	1	48
Balance at end of period	27,096	28,604	31,176
Individually evaluated for impairment			445
Collectively evaluated for impairment			32,937
Loans acquired and accounted for under ASC 310-30			325
Individually evaluated for impairment			3,438
Collectively evaluated for impairment			1,550,239
Loans acquired and accounted for under ASC 310-30			24,613
Commercial Real Estate | Allowance For Credit Losses
Loans and Allowance for Credit Losses
Balance at beginning of period		33,707	24,334
Provision (credit) charged to expense			9,343
Losses charged off			(43)
Recoveries			73
Balance at end of period			33,707
Commercial Real Estate | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period	367	354
Provision (credit) charged to expense	49	13
Balance at end of period	416	367	354
Commercial Real Estate | CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		(2,531)
Balance at end of period			(2,531)
Commercial Real Estate | CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			354
Commercial Real Estate | Before CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		33,707
Balance at end of period			33,707
Commercial Real Estate | Before CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			0
Commercial Construction
Loans and Allowance for Credit Losses
Balance at beginning of period	2,797	2,356
Provision (credit) charged to expense	152	575
Losses charged off	(84)	(154)
Recoveries		20
Balance at end of period	2,865	2,797	2,356
Collectively evaluated for impairment			3,378
Loans acquired and accounted for under ASC 310-30			143
Collectively evaluated for impairment			1,266,847
Loans acquired and accounted for under ASC 310-30			2,551
Commercial Construction | Allowance For Credit Losses
Loans and Allowance for Credit Losses
Balance at beginning of period		3,521	3,076
Provision (credit) charged to expense			242
Losses charged off			(1)
Recoveries			204
Balance at end of period			3,521
Commercial Construction | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period	908	910
Provision (credit) charged to expense	(106)	(2)
Balance at end of period	802	908	910
Commercial Construction | CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		(1,165)
Balance at end of period			(1,165)
Commercial Construction | CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			910
Commercial Construction | Before CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		3,521
Balance at end of period			3,521
Commercial Construction | Before CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			0
Commercial Business
Loans and Allowance for Credit Losses
Balance at beginning of period	4,142	3,889
Provision (credit) charged to expense	1,491
Losses charged off	(51)	(81)
Recoveries	240	334
Balance at end of period	5,822	4,142	3,889
Individually evaluated for impairment			14
Collectively evaluated for impairment			2,331
Loans acquired and accounted for under ASC 310-30			45
Individually evaluated for impairment			167
Collectively evaluated for impairment			384,734
Loans acquired and accounted for under ASC 310-30			2,549
Commercial Business | Allowance For Credit Losses
Loans and Allowance for Credit Losses
Balance at beginning of period		2,390	1,355
Provision (credit) charged to expense			914
Losses charged off			(28)
Recoveries			149
Balance at end of period			2,390
Commercial Business | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period	1,582	935
Provision (credit) charged to expense	152	647
Balance at end of period	1,734	1,582	935
Commercial Business | CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		1,499
Balance at end of period			1,499
Commercial Business | CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			935
Commercial Business | Before CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		2,390
Balance at end of period			2,390
Commercial Business | Before CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			0
Consumer
Loans and Allowance for Credit Losses
Balance at beginning of period	5,345	5,641
Provision (credit) charged to expense	(328)
Losses charged off	(1,950)	(2,054)
Recoveries	1,349	1,758
Balance at end of period	4,416	5,345	5,641
Individually evaluated for impairment			164
Collectively evaluated for impairment			2,040
Loans acquired and accounted for under ASC 310-30			10
Individually evaluated for impairment			1,897
Collectively evaluated for impairment			239,727
Loans acquired and accounted for under ASC 310-30			5,667
Consumer | Allowance For Credit Losses
Loans and Allowance for Credit Losses
Balance at beginning of period		2,214	2,037
Provision (credit) charged to expense			1,246
Losses charged off			(3,152)
Recoveries			2,083
Balance at end of period			2,214
Consumer | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period	382	347
Provision (credit) charged to expense	122	35
Balance at end of period	$ 504	382	347
Consumer | CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		3,427
Balance at end of period			3,427
Consumer | CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			347
Consumer | Before CECL adoption
Loans and Allowance for Credit Losses
Balance at beginning of period		$ 2,214
Balance at end of period			2,214
Consumer | Before CECL adoption | Allowance for unfunded commitment
Loans and Allowance for Credit Losses
Balance at beginning of period			$ 0