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Allowance for Loan Losses - Loan losses by portfolio segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period $ 11,345 $ 9,279
Charge-Offs (163) (154)
Recoveries 49 34
Provision (Credit) 400 175
Balance at End of Period 11,631 9,334
Allocation for General Risk [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period 1,093 924
Charge-Offs 0 0
Recoveries 0 0
Provision (Credit) 68 1
Balance at End of Period 1,161 925
Commercial | Commercial.    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period 3,472 3,951
Charge-Offs (122) 0
Recoveries 17 0
Provision (Credit) 205 (91)
Balance at End of Period 3,572 3,860
Commercial | Commercial loans secured by non-owner occupied real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period 5,373 3,119
Charge-Offs 0 0
Recoveries 13 14
Provision (Credit) 62 155
Balance at End of Period 5,448 3,288
Consumer | Real estate-residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period 1,292 1,159
Charge-Offs (17) (92)
Recoveries 5 6
Provision (Credit) 49 68
Balance at End of Period 1,329 1,141
Consumer | Consumer.    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period 115 126
Charge-Offs (24) (62)
Recoveries 14 14
Provision (Credit) 16 42
Balance at End of Period $ 121 $ 120