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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, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Total $ 80,332   $ 71,265      
Allowance for Loan Losses, LHFI [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually 7,421   3,260      
Collectively 72,911   68,005      
Total 80,332 $ 76,184 71,265 $ 70,871 $ 71,796 $ 67,619
Allowance for Loan Losses, LHFI [Member] | Commercial and Industrial Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually 101   1,976      
Collectively 19,679   20,035      
Total 19,780   22,011 20,908   15,815
Allowance for Loan Losses, LHFI [Member] | Consumer Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Collectively 4,456   3,241      
Total 4,456   3,241 3,027   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 811   859      
Total 811   859 877   809
Allowance for Loan Losses, LHFI [Member] | Other Loans [Member]            
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Individually 657          
Collectively 3,547   2,492      
Total 4,204   2,492 1,998   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 70   103      
Collectively 8,578   8,982      
Total 8,648   9,085 9,198   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 1,243   960      
Collectively 9,037   9,387      
Total 10,280   10,347 10,401   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 5,350   221      
Collectively 23,398   20,746      
Total 28,748   20,967 22,203   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 3,405   2,263      
Total $ 3,405   $ 2,263 $ 2,259   $ 2,467