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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, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Allowance for Loan Losses:            
Collectively evaluated for impairment $ 12,518   $ 13,621      
Individually evaluated for impairment 2,700   100      
Allowance for Loan Losses, Ending Balance 15,218 $ 14,705 13,721 $ 14,122 $ 12,454 $ 11,634
Loans:            
Collectively evaluated for impairment 1,067,445   945,187      
Individually evaluated for impairment 6,757   2,695      
Total 1,074,202   947,882      
Commercial real estate            
Allowance for Loan Losses:            
Collectively evaluated for impairment 3,145   3,324      
Allowance for Loan Losses, Ending Balance 3,145 3,551 3,324 3,294 3,533 2,655
Loans:            
Collectively evaluated for impairment 403,607   349,415      
Individually evaluated for impairment 1,146   1,207      
Total 404,753   350,622      
Consumer real estate            
Allowance for Loan Losses:            
Collectively evaluated for impairment 983   1,063      
Allowance for Loan Losses, Ending Balance 983 1,057 1,063 984 1,081 1,013
Loans:            
Collectively evaluated for impairment 112,865   102,581      
Individually evaluated for impairment 92          
Total 112,957   102,581      
Construction and land development            
Allowance for Loan Losses:            
Collectively evaluated for impairment 2,213   1,628      
Allowance for Loan Losses, Ending Balance 2,213 1,764 1,628 1,487 911 1,574
Loans:            
Collectively evaluated for impairment 129,799   82,586      
Total 129,799   82,586      
Commercial and industrial            
Allowance for Loan Losses:            
Collectively evaluated for impairment 5,868   7,109      
Individually evaluated for impairment 2,700   100      
Allowance for Loan Losses, Ending Balance 8,568 7,779 7,209 7,949 6,395 5,618
Loans:            
Collectively evaluated for impairment 393,207   371,760      
Individually evaluated for impairment 5,419   1,488      
Total 398,626   373,248      
Consumer            
Allowance for Loan Losses:            
Collectively evaluated for impairment 93   91      
Allowance for Loan Losses, Ending Balance 93 120 91 79 57 76
Loans:            
Collectively evaluated for impairment 8,174   6,862      
Individually evaluated for impairment 100          
Total 8,274   6,862      
Other            
Allowance for Loan Losses:            
Collectively evaluated for impairment 216   406      
Allowance for Loan Losses, Ending Balance 216 $ 434 406 $ 329 $ 477 $ 698
Loans:            
Collectively evaluated for impairment 19,793   31,983      
Total $ 19,793   $ 31,983