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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
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate $ 270,270 $ 270,496
U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 24,066 25,592
U.S. Government-sponsored enterprises state and municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 91,990 92,818
State and Municipals, Taxable    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 21,500 13,853
State and Municipals, Tax-exempt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 61,683 85,954
Mortgage-backed Securities, U.S. Government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 9,613 12,629
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 59,971 38,836
Common equity securities.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 297 291
Interest rate floor - other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 1,170 553
Interest rate swap-other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 6,065 108
Interest rate swap-other liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities measured at fair value (6,085) (138)
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 24,363 25,883
Level 1 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 24,066 25,592
Level 1 | Common equity securities.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 297 291
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 245,907 244,613
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 91,990 92,818
Level 2 | State and Municipals, Taxable    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 21,500 13,853
Level 2 | State and Municipals, Tax-exempt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 61,683 85,954
Level 2 | Mortgage-backed Securities, U.S. Government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 9,613 12,629
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 59,971 38,836
Level 2 | Interest rate floor - other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 1,170 553
Level 2 | Interest rate swap-other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, Fair Value Estimate 6,065 108
Level 2 | Interest rate swap-other liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities measured at fair value $ (6,085) $ (138)