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Allowance for Loan Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Losses $ 4,588 $ 4,774 $ 4,643 $ 4,289
Financing Receivable, Allowance for Credit Losses, Charge-offs (5) (316) (84) (460)
Financing Receivable, Allowance for Credit Losses, Recoveries 282 70 306 1,299
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries 277 (246) 222 839
Provision for loan losses 100 0 100 (600)
Financing Receivable, Allowance for Credit Losses 4,965 4,528 4,965 4,528
Commercial and Industrial Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Losses 524 517 540 523
Financing Receivable, Allowance for Credit Losses, Charge-offs 0 (83) 0 (83)
Financing Receivable, Allowance for Credit Losses, Recoveries 4 3 6 23
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries 4 (80) 6 (60)
Provision for loan losses 149 69 131 43
Financing Receivable, Allowance for Credit Losses 677 506 677 506
Construction And Land Development Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Losses 845 695 812 669
Financing Receivable, Allowance for Credit Losses, Charge-offs 0 0 0 0
Financing Receivable, Allowance for Credit Losses, Recoveries 209 5 214 1,203
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries 209 5 214 1,203
Provision for loan losses (180) 44 (152) (1,128)
Financing Receivable, Allowance for Credit Losses 874 744 874 744
Commercial Real Estate Loans, Total [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Losses 2,004 2,403 2,071 1,879
Financing Receivable, Allowance for Credit Losses, Charge-offs 0 (194) 0 (194)
Financing Receivable, Allowance for Credit Losses, Recoveries 0 0 0 0
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries 0 (194) 0 (194)
Provision for loan losses 117 (117) 50 407
Financing Receivable, Allowance for Credit Losses 2,121 2,092 2,121 2,092
Residential Real Estate Loans, Total [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Losses 1,064 1,026 1,107 1,059
Financing Receivable, Allowance for Credit Losses, Charge-offs 0 (37) (78) (155)
Financing Receivable, Allowance for Credit Losses, Recoveries 63 58 77 65
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries 63 21 (1) (90)
Provision for loan losses (8) 14 13 92
Financing Receivable, Allowance for Credit Losses 1,119 1,061 1,119 1,061
Consumer Installment and Revolving Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Losses 151 133 113 159
Financing Receivable, Allowance for Credit Losses, Charge-offs (5) (2) (6) (28)
Financing Receivable, Allowance for Credit Losses, Recoveries 6 4 9 8
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries 1 2 3 (20)
Provision for loan losses 22 (10) 58 (14)
Financing Receivable, Allowance for Credit Losses $ 174 $ 125 $ 174 $ 125