Loans - Summary of Internal Risk Ratings of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 269,985	$ 254,612
Real estate loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	236,953	223,969
Real estate loans [Member] | One To Four Family [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	133,719	127,755
Real estate loans [Member] | Multifamily [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,261	3,729
Real estate loans [Member] | Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	83,672	76,967
Real estate loans [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	16,301	15,518
Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	25,418	24,212
Consumer Loans [Member] | Home Equity Loans And Lines Of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	4,020	3,717
Consumer Loans [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,594	2,714
Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	264,214	248,789
Pass [Member] | Real estate loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	231,493	218,534
Pass [Member] | Real estate loans [Member] | One To Four Family [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	133,476	127,513
Pass [Member] | Real estate loans [Member] | Multifamily [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,261	3,729
Pass [Member] | Real estate loans [Member] | Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	78,549	71,774
Pass [Member] | Real estate loans [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	16,207	15,518
Pass [Member] | Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	25,107	23,824
Pass [Member] | Consumer Loans [Member] | Home Equity Loans And Lines Of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	4,020	3,717
Pass [Member] | Consumer Loans [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,594	2,714
Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,016	2,073
Special Mention [Member] | Real estate loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,914	1,969
Special Mention [Member] | Real estate loans [Member] | One To Four Family [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Special Mention [Member] | Real estate loans [Member] | Multifamily [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Special Mention [Member] | Real estate loans [Member] | Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,914	1,969
Special Mention [Member] | Real estate loans [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Special Mention [Member] | Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	102	104
Special Mention [Member] | Consumer Loans [Member] | Home Equity Loans And Lines Of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Special Mention [Member] | Consumer Loans [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,755	3,750
Substandard [Member] | Real estate loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,546	3,466
Substandard [Member] | Real estate loans [Member] | One To Four Family [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	243	242
Substandard [Member] | Real estate loans [Member] | Multifamily [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Substandard [Member] | Real estate loans [Member] | Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,209	3,224
Substandard [Member] | Real estate loans [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	94	0
Substandard [Member] | Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	209	284
Substandard [Member] | Consumer Loans [Member] | Home Equity Loans And Lines Of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Substandard [Member] | Consumer Loans [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member] | Real estate loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member] | Real estate loans [Member] | One To Four Family [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member] | Real estate loans [Member] | Multifamily [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member] | Real estate loans [Member] | Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member] | Real estate loans [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member] | Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member] | Consumer Loans [Member] | Home Equity Loans And Lines Of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member] | Consumer Loans [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 0	$ 0