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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period $ 9,699 $ 8,102 $ 9,279 $ 8,671
Charge-Offs (144) (37) (417) (341)
Recoveries 54 55 122 190
Provision (Credit) 675 225 1,300 (175)
Balance at End of Period 10,284 8,345 10,284 8,345
Allocation for General Risk [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 961 797 924 863
Charge-Offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) 52 (140) 89 (206)
Balance at End of Period 1,013 657 1,013 657
Commercial | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 3,784 2,538 3,951 3,057
Charge-Offs (111) (1) (111) (1)
Recoveries 1 8 1 13
Provision (Credit) (638) 464 (805) (60)
Balance at End of Period 3,036 3,009 3,036 3,009
Commercial | Commercial loans secured by non-owner occupied real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 3,619 3,425 3,119 3,389
Charge-Offs 0 0 0 (63)
Recoveries 10 12 31 36
Provision (Credit) 1,261 (81) 1,740 (6)
Balance at End of Period 4,890 3,356 4,890 3,356
Consumer | Real estate-residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 1,216 1,218 1,159 1,235
Charge-Offs (19) 0 (201) (71)
Recoveries 24 25 46 101
Provision (Credit) 4 (46) 221 (68)
Balance at End of Period 1,225 1,197 1,225 1,197
Consumer | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 119 124 126 127
Charge-Offs (14) (36) (105) (206)
Recoveries 19 10 44 40
Provision (Credit) (4) 28 55 165
Balance at End of Period $ 120 $ 126 $ 120 $ 126