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Financial instruments with off-balance sheet credit risk (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Commitments to originate loans $ 800,000  
Letters of credit 2,800,000 $ 4,800,000
Performing Financial Instruments [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Residential 16,288,000 11,661,000
Home equity lines of credit 31,490,000 28,919,000
Commercial 41,544,000 10,103,000
Land 839,000 566,000
Real estate secured 90,161,000 51,249,000
Commercial and industrial 112,262,000 94,854,000
Municipal 541,000 1,804,000
Consumer 4,349,000 2,077,000
Unadvanced portions of loans 207,313,000 149,984,000
Commitments to originate loans 43,689,000 49,753,000
Letters of credit 2,835,000 4,758,000
Total $ 253,837,000 $ 204,495,000