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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually $ 4,400   $ 6,400      
Total 83,226   79,290      
Allowance for Loan Losses, LHFI [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually 4,377   6,354      
Collectively 78,849   72,936      
Total 83,226 $ 80,399 79,290 $ 88,874 $ 83,566 $ 76,733
Allowance for Loan Losses, LHFI [Member] | Commercial and Industrial Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually 3,435   4,334      
Collectively 25,432   23,025      
Total 28,867   27,359 33,317   22,851
Allowance for Loan Losses, LHFI [Member] | Consumer Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Collectively 3,312   2,890      
Total 3,312   2,890 3,394   3,470
Allowance for Loan Losses, LHFI [Member] | State and Other Political Subdivision Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually     516      
Collectively 472   474      
Total 472   990 1,193   789
Allowance for Loan Losses, LHFI [Member] | Other Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually 685   1,052      
Collectively 4,989   5,142      
Total 5,674   6,194 5,440   4,666
Allowance for Loan Losses, LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Collectively 7,701   7,390      
Total 7,701   7,390 8,414   7,865
Allowance for Loan Losses, LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually 29   39      
Collectively 8,415   8,602      
Total 8,444   8,641 9,308   10,874
Allowance for Loan Losses, LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually 228   413      
Collectively 24,974   21,963      
Total 25,202   22,376 24,859   23,428
Allowance for Loan Losses, LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Collectively 3,554   3,450      
Total $ 3,554   $ 3,450 $ 2,949   $ 2,790