Quarterly report pursuant to Section 13 or 15(d)

Loans and allowance for loan losses (Details)

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Loans and allowance for loan losses (Details) - USD ($)
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loan Balance $ 96,182,000   $ 98,659,000      
Net deferred loan costs 752,000   666,000      
Allowance for loan losses (783,000) $ (792,000) (870,000) $ (709,000) $ (616,000) $ (388,000)
Loans, net 96,151,000   98,455,000      
Custodial escrow balances maintained in connection with the foregoing loan servicing 142,000   268,000      
Amount of loans made to directors and officers 687,000   928,000      
First mortgage loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loan Balance 95,858,000   98,274,000      
First mortgage loans | 1-4 family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loan Balance 87,184,000   87,197,000      
Allowance for loan losses (679,000) (695,000) (798,000) (559,000) (538,000) (361,000)
First mortgage loans | Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loan Balance 4,221,000   5,737,000      
Allowance for loan losses (39,000) (52,000) (29,000) (24,000) (24,000) (10,000)
First mortgage loans | Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loan Balance 4,453,000   5,340,000      
Allowance for loan losses (25,000) (25,000) (38,000) (12,000) (13,000) (9,000)
First mortgage loans | Others            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net 16,900,000   16,000,000.0      
Consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Loan Balance 324,000   385,000      
Allowance for loan losses $ (10,000) $ (10,000) $ (5,000) $ (1,000) $ (1,000) $ (8,000)