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LHFI and Allowance for Loan Losses, LHFI - Change in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period $ 67,619      
Provision for loan losses, LHFI 2,243 $ 1,785    
Balance at end of period 69,668      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Total 69,668   $ 69,668  
Allowance for Loan Losses, LHFI [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 67,619 69,616    
Loans charged-off (3,363) (3,004)    
Recoveries 3,169 2,924    
Net charge-offs (194) (80)    
Provision for loan losses, LHFI 2,243 1,785    
Balance at end of period 69,668 71,321    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually     11,413 $ 14,016
Collectively     58,255 57,305
Total 67,619 69,616 69,668 71,321
Allowance for Loan Losses, LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 11,587 13,073    
Loans charged-off   (9)    
Recoveries 492 240    
Provision for loan losses, LHFI (1,937) 2,969    
Balance at end of period 10,142 16,273    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually     736 4,097
Collectively     9,406 12,176
Total 11,587 13,073 10,142 16,273
Allowance for Loan Losses, LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 10,678 9,677    
Loans charged-off (692) (434)    
Recoveries 457 43    
Provision for loan losses, LHFI 30 (402)    
Balance at end of period 10,473 8,884    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually     1,219 429
Collectively     9,254 8,455
Total 10,678 9,677 10,473 8,884
Allowance for Loan Losses, LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 21,563 18,523    
Loans charged-off (27)      
Recoveries 119 315    
Provision for loan losses, LHFI 2,052 15    
Balance at end of period 23,707 18,853    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually     4,374 2,728
Collectively     19,333 16,125
Total 21,563 18,523 23,707 18,853
Allowance for Loan Losses, LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 2,467 2,141    
Loans charged-off   (24)    
Recoveries 1 3    
Provision for loan losses, LHFI (395) (42)    
Balance at end of period 2,073 2,078    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually     14 51
Collectively     2,059 2,027
Total 2,467 2,141 2,073 2,078
Allowance for Loan Losses, LHFI [Member] | Commercial and Industrial Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 15,815 19,917    
Loans charged-off (770) (669)    
Recoveries 123 342    
Provision for loan losses, LHFI 2,481 487    
Balance at end of period 17,649 20,077    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually     4,890 6,502
Collectively     12,759 13,575
Total 15,815 19,917 17,649 20,077
Allowance for Loan Losses, LHFI [Member] | Consumer Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 2,879 2,149    
Loans charged-off (484) (498)    
Recoveries 1,010 937    
Provision for loan losses, LHFI (601) (627)    
Balance at end of period 2,804 1,961    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually     1  
Collectively     2,803 1,961
Total 2,879 2,149 2,804 1,961
Allowance for Loan Losses, LHFI [Member] | State and Other Political Subdivision Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 809 1,314    
Provision for loan losses, LHFI 7 (627)    
Balance at end of period 816 687    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Collectively     816 687
Total 809 1,314 816 687
Allowance for Loan Losses, LHFI [Member] | Other Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,821 2,822    
Loans charged-off (1,390) (1,370)    
Recoveries 967 1,044    
Provision for loan losses, LHFI 606 12    
Balance at end of period 2,004 2,508    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually     179 209
Collectively     1,825 2,299
Total $ 1,821 $ 2,822 $ 2,004 $ 2,508