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Allowance for Loan Losses - Loan losses by portfolio segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period $ 11,631 $ 9,334 $ 11,345 $ 9,279
Charge-Offs (36) (119) (199) (273)
Recoveries 57 34 106 68
Provision (Credit) 100 450 500 625
Balance at End of Period 11,752 9,699 11,752 9,699
Allocation for General Risk [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 1,161 925 1,093 924
Charge-Offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) 11 36 79 37
Balance at End of Period 1,172 961 1,172 961
Commercial | Commercial.        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 3,572 3,860 3,472 3,951
Charge-Offs (25) 0 (147) 0
Recoveries 0 0 17 0
Provision (Credit) (13) (76) 192 (167)
Balance at End of Period 3,534 3,784 3,534 3,784
Commercial | Commercial loans secured by non-owner occupied real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 5,448 3,288 5,373 3,119
Charge-Offs 0 0 0 0
Recoveries 11 7 24 21
Provision (Credit) 76 324 138 479
Balance at End of Period 5,535 3,619 5,535 3,619
Consumer | Real estate-residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 1,329 1,141 1,292 1,159
Charge-Offs 0 (90) (17) (182)
Recoveries 29 16 34 22
Provision (Credit) 30 149 79 217
Balance at End of Period 1,388 1,216 1,388 1,216
Consumer | Consumer.        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 121 120 115 126
Charge-Offs (11) (29) (35) (91)
Recoveries 17 11 31 25
Provision (Credit) (4) 17 12 59
Balance at End of Period $ 123 $ 119 $ 123 $ 119