Loans - Schedule of Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	$ 807,740	$ 687,868
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	803,231	682,316
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	4,509	5,552
Real estate loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	675,525	562,190
Real estate loans: | One-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	250,295	207,660
Real estate loans: | One-to-four family | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	248,626	205,453
Real estate loans: | One-to-four family | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	1,669	2,207
Real estate loans: | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	16,374	13,250
Real estate loans: | Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	16,222	13,110
Real estate loans: | Home equity | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	152	140
Real estate loans: | Commercial and multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	307,462	278,175
Real estate loans: | Commercial and multifamily | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	305,155	275,795
Real estate loans: | Commercial and multifamily | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	2,307	2,380
Real estate loans: | Construction and land
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	101,394	63,105
Real estate loans: | Construction and land | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	101,364	63,072
Real estate loans: | Construction and land | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	30	33
Consumer loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	107,913	97,652
Consumer loans: | Manufactured homes
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	23,264	21,636
Consumer loans: | Manufactured homes | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	23,147	21,514
Consumer loans: | Manufactured homes | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	117	122
Consumer loans: | Floating homes
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	66,573	59,268
Consumer loans: | Floating homes | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	66,573	58,775
Consumer loans: | Floating homes | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	0	493
Consumer loans: | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	18,076	16,748
Consumer loans: | Other consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	17,843	16,748
Consumer loans: | Other consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	233	0
Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	24,302	28,026
Commercial business | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	24,302	27,850
Commercial business | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-portfolio	$ 0	$ 176