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Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Basis - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate $ 298,158 $ 332,879
U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 18,905 24,128
U.S. government-sponsored enterprises state and municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 65,188 87,110
State and Municipals, Taxable    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 55,366 34,898
State and Municipals, Tax-exempt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 56,994 60,163
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 1,000  
Mortgage-backed Securities, U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 3,707 8,470
Mortgage-backed Securities, U.S. government-sponsored enterprises    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 94,751 115,709
Common equity securities.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 138 423
Loan held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 837 986
Interest rate floor - other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 1,678 944
Interest rate swap-other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 13,693 4,728
Interest rate swap-other liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities measured at fair value (14,099) (4,680)
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 19,043 24,551
Level 1 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 18,905 24,128
Level 1 | Common equity securities.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 138 423
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 279,115 308,328
Level 2 | U.S. government-sponsored enterprises state and municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 65,188 87,110
Level 2 | State and Municipals, Taxable    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 55,366 34,898
Level 2 | State and Municipals, Tax-exempt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 56,994 60,163
Level 2 | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 1,000  
Level 2 | Mortgage-backed Securities, U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 3,707 8,470
Level 2 | Mortgage-backed Securities, U.S. government-sponsored enterprises    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 94,751 115,709
Level 2 | Loan held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 837 986
Level 2 | Interest rate floor - other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 1,678 944
Level 2 | Interest rate swap-other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 13,693 4,728
Level 2 | Interest rate swap-other liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities measured at fair value $ (14,099) (4,680)
Level 3 | Common equity securities.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate  
Level 3 | Loan held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate  
Level 3 | Interest rate floor - other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate  
Level 3 | Interest rate swap-other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate  
Level 3 | Interest rate swap-other liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities measured at fair value