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Loans and allowance for loan losses - Aging of the Banks loan portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Non-accrual | $ 105 | $ 280
Total Past Due and Non-Accrual | 148 | 454
Total Loan Balance | 96,182 | 98,659
31-89 Days Past Due and Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance |  | 99
Greater than 90 Days Past Due and Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance | 43 | 75
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance | 96,034 | 98,205
First mortgage loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance | 95,858 | 98,274
First mortgage loans | 1-4 family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Non-accrual | 105 | 280
Total Past Due and Non-Accrual | 148 | 355
Total Loan Balance | 87,184 | 87,197
First mortgage loans | 1-4 family residential | Greater than 90 Days Past Due and Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance | 43 | 75
First mortgage loans | 1-4 family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance | 87,036 | 86,842
First mortgage loans | Multi-family |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance | 4,221 | 5,737
First mortgage loans | Multi-family | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance | 4,221 | 5,737
First mortgage loans | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance | 4,453 | 5,340
First mortgage loans | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance | 4,453 | 5,340
Consumer loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-Accrual |  | 99
Total Loan Balance | 324 | 385
Consumer loans | 31-89 Days Past Due and Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance |  | 99
Consumer loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loan Balance | $ 324 | $ 286

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