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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
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Total $ 76,184   $ 71,265      
Allowance for Loan Losses, LHFI [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually 6,169   3,260      
Collectively 70,015   68,005      
Total 76,184 $ 72,445 71,265 $ 71,796 $ 69,668 $ 67,619
Allowance for Loan Losses, LHFI [Member] | Commercial and Industrial Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually 1,652   1,976      
Collectively 20,228   20,035      
Total 21,880   22,011 17,951   15,815
Allowance for Loan Losses, LHFI [Member] | Consumer Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Collectively 3,314   3,241      
Total 3,314   3,241 3,032   2,879
Allowance for Loan Losses, LHFI [Member] | State and Other Political Subdivision Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually     0      
Collectively 759   859      
Total 759   859 913   809
Allowance for Loan Losses, LHFI [Member] | Other Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Collectively 3,169   2,492      
Total 3,169   2,492 2,263   1,821
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]            
Individually 112   103      
Collectively 8,612   8,982      
Total 8,724   9,085 10,718   11,587
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 1,320   960      
Collectively 9,174   9,387      
Total 10,494   10,347 9,815   10,678
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 3,085   221      
Collectively 21,565   20,746      
Total 24,650   20,967 24,350   21,563
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 3,194   2,263      
Total $ 3,194   $ 2,263 $ 2,754   $ 2,467