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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period $ 9,334 $ 8,107 $ 9,279 $ 8,671
Charge-Offs (119) (98) (273) (304)
Recoveries 34 93 68 135
Provision (Credit) 450 0 625 (400)
Balance at End of Period 9,699 8,102 9,699 8,102
Allocation for General Risk [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 925 782 924 863
Charge-Offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) 36 15 37 (66)
Balance at End of Period 961 797 961 797
Commercial | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 3,860 2,614 3,951 3,057
Charge-Offs 0 0 0 0
Recoveries 0 0 0 5
Provision (Credit) (76) (76) (167) (524)
Balance at End of Period 3,784 2,538 3,784 2,538
Commercial | Commercial loans secured by non-owner occupied real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 3,288 3,373 3,119 3,389
Charge-Offs 0 0 0 (63)
Recoveries 7 13 21 24
Provision (Credit) 324 39 479 75
Balance at End of Period 3,619 3,425 3,619 3,425
Consumer | Real estate-residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 1,141 1,213 1,159 1,235
Charge-Offs (90) (10) (182) (71)
Recoveries 16 68 22 76
Provision (Credit) 149 (53) 217 (22)
Balance at End of Period 1,216 1,218 1,216 1,218
Consumer | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 120 125 126 127
Charge-Offs (29) (88) (91) (170)
Recoveries 11 12 25 30
Provision (Credit) 17 75 59 137
Balance at End of Period $ 119 $ 124 $ 119 $ 124