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Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period $ 10,391 $ 9,746 $ 9,932 $ 9,921
Charge-Offs (379) (469) (643) (4,113)
Recoveries 134 149 307 268
Provision (Credit) 200 300 750 3,650
Balance at End of Period 10,346 9,726 10,346 9,726
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 3,825 4,322 4,041 4,244
Charge-Offs (228) (295) (228) (3,648)
Recoveries 9 115 22 126
Provision (Credit) 561 92 332 3,512
Balance at End of Period 4,167 4,234 4,167 4,234
Commercial loans secured by real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 4,487 3,274 3,584 3,449
Charge-Offs 0 (13) (14) (13)
Recoveries 3 2 8 38
Provision (Credit) (644) 85 268 (126)
Balance at End of Period 3,846 3,348 3,846 3,348
Real estate-mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 1,151 1,075 1,169 1,173
Charge-Offs (109) (104) (263) (150)
Recoveries 72 24 165 86
Provision (Credit) 50 77 93 (37)
Balance at End of Period 1,164 1,072 1,164 1,072
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 138 135 151 151
Charge-Offs (42) (57) (138) (302)
Recoveries 50 8 112 18
Provision (Credit) (7) 53 14 272
Balance at End of Period 139 139 139 139
Allocation for general risk [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 790 940 987 904
Charge-Offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) 240 (7) 43 29
Balance at End of Period $ 1,030 $ 933 $ 1,030 $ 933