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Loans and Allowance for Loan Losses - Summary of Breakdown of Allowance for Loan Losses and Loan Portfolio by Loan Category (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Allowance for Loan Losses:            
Collectively evaluated for impairment $ 13,622   $ 11,134      
Individually evaluated for impairment 500   500      
Allowance for Loan Losses, Ending Balance 14,122 $ 12,454 11,634 $ 11,510 $ 10,454 $ 10,132
Loans:            
Collectively evaluated for impairment 971,724   932,599      
Individually evaluated for impairment 3,165   3,619      
Total 974,889   936,218      
Commercial real estate            
Allowance for Loan Losses:            
Collectively evaluated for impairment 3,294   2,655      
Individually evaluated for impairment 0          
Allowance for Loan Losses, Ending Balance 3,294 3,533 2,655 2,420 2,596 2,879
Loans:            
Collectively evaluated for impairment 365,545   301,012      
Individually evaluated for impairment 1,233   1,310      
Total 366,778   302,322      
Consumer real estate            
Allowance for Loan Losses:            
Collectively evaluated for impairment 984   1,013      
Individually evaluated for impairment 0          
Allowance for Loan Losses, Ending Balance 984 1,081 1,013 972 968 968
Loans:            
Collectively evaluated for impairment 100,811   97,015      
Individually evaluated for impairment     0      
Total 100,811   97,015      
Construction and land development            
Allowance for Loan Losses:            
Collectively evaluated for impairment 1,487   1,574      
Individually evaluated for impairment 0          
Allowance for Loan Losses, Ending Balance 1,487 911 1,574 1,664 943 914
Loans:            
Collectively evaluated for impairment 79,951   94,491      
Individually evaluated for impairment     0      
Total 79,951   94,491      
Commercial and industrial            
Allowance for Loan Losses:            
Collectively evaluated for impairment 7,449   5,118      
Individually evaluated for impairment 500   500      
Allowance for Loan Losses, Ending Balance 7,949 6,395 5,618 5,568 5,037 4,693
Loans:            
Collectively evaluated for impairment 392,668   377,311      
Individually evaluated for impairment 1,932   2,309      
Total 394,600   379,620      
Consumer            
Allowance for Loan Losses:            
Collectively evaluated for impairment 79   76      
Individually evaluated for impairment 0          
Allowance for Loan Losses, Ending Balance 79 57 76 86 104 103
Loans:            
Collectively evaluated for impairment 6,289   5,974      
Individually evaluated for impairment     0      
Total 6,289   5,974      
Other            
Allowance for Loan Losses:            
Collectively evaluated for impairment 329   698      
Individually evaluated for impairment 0          
Allowance for Loan Losses, Ending Balance 329 $ 477 698 $ 800 $ 806 $ 575
Loans:            
Collectively evaluated for impairment 26,460   56,796      
Individually evaluated for impairment     0      
Total $ 26,460   $ 56,796