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Allowance for Loan Losses - Loan losses by portfolio segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period $ 9,279 $ 8,671
Charge-Offs (154) (206)
Recoveries 34 42
Provision (Credit) 175 (400)
Balance at End of Period 9,334 8,107
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period 3,951 3,057
Charge-Offs 0 0
Recoveries 0 5
Provision (Credit) (91) (448)
Balance at End of Period 3,860 2,614
Commercial loans secured by non-owner occupied real estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period 3,119 3,389
Charge-Offs 0 (63)
Recoveries 14 11
Provision (Credit) 155 36
Balance at End of Period 3,288 3,373
Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period 1,159 1,235
Charge-Offs (92) (61)
Recoveries 6 8
Provision (Credit) 68 31
Balance at End of Period 1,141 1,213
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period 126 127
Charge-Offs (62) (82)
Recoveries 14 18
Provision (Credit) 42 62
Balance at End of Period 120 125
Allocation for General Risk [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at Beginning of Period 924 863
Charge-Offs 0 0
Recoveries 0 0
Provision (Credit) 1 (81)
Balance at End of Period $ 925 $ 782