Loans Receivable and Allowance for Credit Losses - Financing Receivables, Summary of loans by type and payment activity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,183,385	$ 1,182,310
Deferred loan fee (costs)		151
Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		1,182,159
Previously Reported | One-to-four family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		475,836
Previously Reported | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		126,895
Previously Reported | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		407,882
Previously Reported | Construction/land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		78,120
Previously Reported | Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		31,371
Previously Reported | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		62,055
Pass, grade 1-4
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,126,453
Pass, grade 1-4 | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		1,110,622
Pass, grade 1-4 | Previously Reported | One-to-four family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		473,700
Pass, grade 1-4 | Previously Reported | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		122,972
Pass, grade 1-4 | Previously Reported | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		342,827
Pass, grade 1-4 | Previously Reported | Construction/land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		78,120
Pass, grade 1-4 | Previously Reported | Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		31,371
Pass, grade 1-4 | Previously Reported | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		61,632
Property total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,183,385
Property total | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		1,182,159
Property total | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,183,184
Property total | Performing | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		1,181,966
Property total | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	201
Property total | Nonperforming | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		193
One-to-four family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	493,208
One-to-four family residential | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		475,836
One-to-four family residential | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	493,208
One-to-four family residential | Performing | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		475,836
One-to-four family residential | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0
One-to-four family residential | Nonperforming | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		0
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	140,022	126,866
Multifamily | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		126,895
Multifamily | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	140,022
Multifamily | Performing | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		126,895
Multifamily | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0
Multifamily | Nonperforming | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	394,691	407,904
Commercial | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		407,882
Commercial | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	394,691
Commercial | Performing | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		407,882
Commercial | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0
Commercial | Nonperforming | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		0
Construction Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	55,341	77,644
Construction Land Development | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		78,120
Construction Land Development | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	55,341
Construction Land Development | Performing | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		78,120
Construction Land Development | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0
Construction Land Development | Nonperforming | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		0
Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	27,975	31,363
Business | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		31,371
Business | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	27,975
Business | Performing | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		31,371
Business | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0
Business | Nonperforming | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	72,148
Consumer | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		62,055
Consumer | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	71,947
Consumer | Performing | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		61,862
Consumer | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	201
Consumer | Nonperforming | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		193
Permanent owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	260,970	232,869
Permanent owner occupied | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		233,785
Permanent owner occupied | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	261,000	233,800
Permanent non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	232,238	241,311
Permanent non-owner occupied | Previously Reported
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		242,051
Permanent non-owner occupied | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 232,200	$ 242,100