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Allowance for Loan Losses - Loan losses by portfolio segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period $ 11,752 $ 9,699 $ 11,345 $ 9,279
Charge-Offs (50) (144) (249) (417)
Recoveries 72 54 178 122
Provision (Credit) 350 675 850 1,300
Balance at End of Period 12,124 10,284 12,124 10,284
Allocation for general risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 1,172 961 1,093 924
Charge-Offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) 36 52 115 89
Balance at End of Period 1,208 1,013 1,208 1,013
Commercial | Commercial.        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 3,534 3,784 3,472 3,951
Charge-Offs 0 (111) (147) (111)
Recoveries 35 1 52 1
Provision (Credit) (445) (638) (253) (805)
Balance at End of Period 3,124 3,036 3,124 3,036
Commercial | Commercial loans secured by non-owner occupied real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 5,535 3,619 5,373 3,119
Charge-Offs 0 0 0 0
Recoveries 13 10 37 31
Provision (Credit) 670 1,261 808 1,740
Balance at End of Period 6,218 4,890 6,218 4,890
Consumer | Real estate-residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 1,388 1,216 1,292 1,159
Charge-Offs 0 (19) (17) (201)
Recoveries 8 24 42 46
Provision (Credit) 61 4 140 221
Balance at End of Period 1,457 1,225 1,457 1,225
Consumer | Consumer.        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 123 119 115 126
Charge-Offs (50) (14) (85) (105)
Recoveries 16 19 47 44
Provision (Credit) 28 (4) 40 55
Balance at End of Period $ 117 $ 120 $ 117 $ 120