Loans - Schedule of Internally Assigned Grades by Type of Loan (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 145,597	$ 123,321
Prior year	100,659	92,473
Two years prior	82,110	218,805
Three years prior	176,983	252,107
Four years prior	223,102	51,822
Prior	153,789	140,028
Revolving Loans Amortized Cost Basis	26,441	20,480
Revolving Loans Amortized Cost Basis Converted to Term	1,034	1,135
Total	909,715	900,171
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	145,597	123,283
Prior year	100,659	92,046
Two years prior	80,809	198,777
Three years prior	176,330	246,227
Four years prior	216,908	49,657
Prior	148,557	123,000
Revolving Loans Amortized Cost Basis	26,369	20,058
Revolving Loans Amortized Cost Basis Converted to Term	903	1,069
Total	896,132	854,117
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0
Prior year		0
Two years prior		17,349
Three years prior		0
Four years prior		0
Prior		1,375
Revolving Loans Amortized Cost Basis		0
Revolving Loans Amortized Cost Basis Converted to Term		0
Total		18,724
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	38
Prior year	0	427
Two years prior	1,301	2,679
Three years prior	653	5,880
Four years prior	6,194	2,165
Prior	5,232	15,653
Revolving Loans Amortized Cost Basis	72	422
Revolving Loans Amortized Cost Basis Converted to Term	131	66
Total	13,583	27,330
Real estate loans: | One-to-four family:
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	18,003	26,327
Prior year	18,174	22,470
Two years prior	18,909	78,686
Three years prior	68,263	98,483
Four years prior	94,495	14,095
Prior	40,006	29,748
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	257,850	269,809
Real estate loans: | One-to-four family: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	18,003	26,327
Prior year	18,174	22,470
Two years prior	17,792	78,427
Three years prior	68,038	98,379
Four years prior	94,401	14,095
Prior	39,678	29,534
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	256,086	269,232
Real estate loans: | One-to-four family: | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Prior year	0	0
Two years prior	1,117	259
Three years prior	225	104
Four years prior	94	0
Prior	328	214
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	1,764	577
Real estate loans: | Home equity:
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	663	3,084
Prior year	2,403	2,951
Two years prior	2,630	2,420
Three years prior	2,131	908
Four years prior	818	210
Prior	866	1,376
Revolving Loans Amortized Cost Basis	19,581	14,812
Revolving Loans Amortized Cost Basis Converted to Term	1,034	1,135
Total	30,126	26,896
Real estate loans: | Home equity: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	663	3,084
Prior year	2,403	2,951
Two years prior	2,630	2,420
Three years prior	2,131	908
Four years prior	818	210
Prior	815	1,320
Revolving Loans Amortized Cost Basis	19,509	14,578
Revolving Loans Amortized Cost Basis Converted to Term	903	1,069
Total	29,872	26,540
Real estate loans: | Home equity: | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Prior year	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Prior	51	56
Revolving Loans Amortized Cost Basis	72	234
Revolving Loans Amortized Cost Basis Converted to Term	131	66
Total	254	356
Real estate loans: | Commercial and multifamily:
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	91,875	34,844
Prior year	31,486	20,736
Two years prior	24,771	90,067
Three years prior	83,595	117,376
Four years prior	95,449	23,405
Prior	79,956	83,854
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	407,132	370,282
Real estate loans: | Commercial and multifamily: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	91,875	34,844
Prior year	31,486	20,736
Two years prior	24,771	90,067
Three years prior	83,595	111,601
Four years prior	89,355	21,240
Prior	75,334	67,336
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	396,416	345,824
Real estate loans: | Commercial and multifamily: | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0
Prior year		0
Two years prior		0
Three years prior		0
Four years prior		0
Prior		1,375
Revolving Loans Amortized Cost Basis		0
Revolving Loans Amortized Cost Basis Converted to Term		0
Total		1,375
Real estate loans: | Commercial and multifamily: | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Prior year	0	0
Two years prior	0	0
Three years prior	0	5,775
Four years prior	6,094	2,165
Prior	4,622	15,143
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	10,716	23,083
Real estate loans: | Construction and land:
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	14,934	26,458
Prior year	18,426	22,846
Two years prior	15,393	19,585
Three years prior	1,548	968
Four years prior	801	593
Prior	1,353	2,362
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	52,455	72,812
Real estate loans: | Construction and land: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	14,934	26,458
Prior year	18,426	22,846
Two years prior	15,393	2,166
Three years prior	1,396	968
Four years prior	801	593
Prior	1,332	2,338
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	52,282	55,369
Real estate loans: | Construction and land: | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0
Prior year		0
Two years prior		17,349
Three years prior		0
Four years prior		0
Prior		0
Revolving Loans Amortized Cost Basis		0
Revolving Loans Amortized Cost Basis Converted to Term		0
Total		17,349
Real estate loans: | Construction and land: | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Prior year	0	0
Two years prior	0	70
Three years prior	152	0
Four years prior	0	0
Prior	21	24
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	173	94
Consumer loans: | Manufactured homes:
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	6,655	9,396
Prior year	8,389	12,522
Two years prior	11,250	7,039
Three years prior	6,073	3,822
Four years prior	3,333	1,816
Prior	6,901	6,385
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	42,601	40,980
Consumer loans: | Manufactured homes: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	6,655	9,396
Prior year	8,389	12,095
Two years prior	11,066	7,039
Three years prior	5,797	3,822
Four years prior	3,333	1,816
Prior	6,691	6,180
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	41,931	40,348
Consumer loans: | Manufactured homes: | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Prior year	0	427
Two years prior	184	0
Three years prior	276	0
Four years prior	0	0
Prior	210	205
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	670	632
Consumer loans: | Floating homes:
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	9,019	20,587
Prior year	19,720	6,395
Two years prior	6,316	18,575
Three years prior	14,715	23,902
Four years prior	23,402	6,059
Prior	15,075	10,472
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	88,247	85,990
Consumer loans: | Floating homes: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	9,019	20,587
Prior year	19,720	6,395
Two years prior	6,316	16,225
Three years prior	14,715	23,902
Four years prior	23,402	6,059
Prior	15,075	10,472
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	88,247	83,640
Consumer loans: | Floating homes: | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0
Prior year		0
Two years prior		2,350
Three years prior		0
Four years prior		0
Prior		0
Revolving Loans Amortized Cost Basis		0
Revolving Loans Amortized Cost Basis Converted to Term		0
Total		2,350
Consumer loans: | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,748	2,273
Prior year	1,783	3,297
Two years prior	2,497	622
Three years prior	354	3,616
Four years prior	3,410	5,387
Prior	6,630	1,925
Revolving Loans Amortized Cost Basis	636	618
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	17,058	17,738
Consumer loans: | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,748	2,273
Prior year	1,783	3,297
Two years prior	2,497	622
Three years prior	354	3,615
Four years prior	3,404	5,387
Prior	6,630	1,925
Revolving Loans Amortized Cost Basis	636	618
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	17,052	17,737
Consumer loans: | Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Prior year	0	0
Two years prior	0	0
Three years prior	0	1
Four years prior	6	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	6	1
Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,700	352
Prior year	278	1,256
Two years prior	344	1,811
Three years prior	304	3,032
Four years prior	1,394	257
Prior	3,002	3,906
Revolving Loans Amortized Cost Basis	6,224	5,050
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	14,246	15,664
Commercial business | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,700	314
Prior year	278	1,256
Two years prior	344	1,811
Three years prior	304	3,032
Four years prior	1,394	257
Prior	3,002	3,895
Revolving Loans Amortized Cost Basis	6,224	4,862
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	14,246	15,427
Commercial business | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	38
Prior year	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Prior	0	11
Revolving Loans Amortized Cost Basis	0	188
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	$ 0	$ 237