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Financial instruments with off-balance sheet credit risk (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Letters of credit $ 4,800,000 $ 4,700,000
Performing Financial Instruments [Member]    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Residential 11,661,000 5,815,000
Home equity lines of credit 28,919,000 28,160,000
Commercial 10,103,000 14,858,000
Land 566,000 1,014,000
Real estate secured 51,249,000 49,847,000
Commercial and industrial 94,854,000 78,286,000
Municipal 1,804,000 2,499,000
Consumer 2,077,000 2,148,000
Unadvanced portions of loans 149,984,000 132,780,000
Commitments to originate loans 49,753,000 33,781,000
Letters of credit 4,758,000 4,657,000
Total $ 204,495,000 $ 171,218,000