Loans Receivable and the Allowance for Loan Losses - Aged analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 76,273	$ 75,431
Loans over 90 days past due and still accruing	0	0
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	76,273	75,431
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	76,273	75,431
Mortgage - 1-4 Family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	65,686	66,356
Mortgage - 1-4 Family | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	65,686	66,356
Mortgage - 1-4 Family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	65,686	66,356
Mortgage - Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,390	2,780
Mortgage - Multifamily | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,390	2,780
Mortgage - Multifamily | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,390	2,780
Mortgage - Construction and Land
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	6,499	4,576
Mortgage - Construction and Land | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	6,499	4,576
Mortgage - Construction and Land | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	6,499	4,576
Mortgage - Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,468	1,480
Mortgage - Commercial real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,468	1,480
Mortgage - Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,468	1,480
Consumer Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	230	239
Consumer Loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	230	239
Consumer Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 230	$ 239