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LHFI and Allowance for Loan Losses, LHFI - Change in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Balance at beginning of period $ 69,616        
Provision for loan losses, LHFI 8,375 $ 1,211 $ (13,421)    
Balance at end of period 67,619 69,616      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Total 67,619 69,616   $ 67,619 $ 69,616
Allowance for Loan Losses, LHFI [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Balance at beginning of period 69,616 66,448 78,738    
Loans charged-off (22,469) (13,226) (13,478)    
Recoveries 12,097 15,183 14,609    
Net (charge-offs) recoveries (10,372) 1,957 1,131    
Provision for loan losses, LHFI 8,375 1,211 (13,421)    
Balance at end of period 67,619 69,616 66,448    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually       8,988 12,764
Collectively       58,631 69,616
Total 69,616 69,616 66,448 67,619 69,616
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 13,073 13,165      
Loans charged-off (2,435) (1,100)      
Recoveries 1,773 3,608      
Provision for loan losses, LHFI (824) (2,600)      
Balance at end of period 11,587 13,073 13,165    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually       909 2,767
Collectively       10,678 13,073
Total 13,073 13,073 13,165 11,587 13,073
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 9,677 9,633      
Loans charged-off (2,473) (2,505)      
Recoveries 920 922      
Provision for loan losses, LHFI 2,554 1,627      
Balance at end of period 10,678 9,677 9,633    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually       1,230 450
Collectively       9,448 9,677
Total 9,677 9,677 9,633 10,678 9,677
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 18,523 19,672      
Loans charged-off (1,439) (390)      
Recoveries 605 944      
Provision for loan losses, LHFI 3,874 (1,703)      
Balance at end of period 21,563 18,523 19,672    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually       3,402 2,787
Collectively       18,161 18,523
Total 18,523 18,523 19,672 21,563 18,523
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 2,141 2,080      
Loans charged-off (24) (277)      
Recoveries 136        
Provision for loan losses, LHFI 214 338      
Balance at end of period 2,467 2,141 2,080    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually       15 52
Collectively       2,452 2,141
Total 2,141 2,141 2,080 2,467 2,141
Allowance for Loan Losses, LHFI [Member] | Commercial and Industrial Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Balance at beginning of period 19,917 15,522      
Loans charged-off (8,081) (2,092)      
Recoveries 1,761 2,657      
Provision for loan losses, LHFI 2,218 3,830      
Balance at end of period 15,815 19,917 15,522    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually       3,304 6,449
Collectively       12,511 19,917
Total 19,917 19,917 15,522 15,815 19,917
Allowance for Loan Losses, LHFI [Member] | Consumer Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Balance at beginning of period 2,149 2,405      
Loans charged-off (2,171) (1,965)      
Recoveries 3,289 3,883      
Provision for loan losses, LHFI (388) (2,174)      
Balance at end of period 2,879 2,149 2,405    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Collectively       2,879 2,149
Total 2,149 2,149 2,405 2,879 2,149
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 1,314 1,205      
Provision for loan losses, LHFI (505) 109      
Balance at end of period 809 1,314 1,205    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Collectively       809 1,314
Total 1,314 1,314 1,205 809 1,314
Allowance for Loan Losses, LHFI [Member] | Other Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Balance at beginning of period 2,822 2,766      
Loans charged-off (5,846) (4,897)      
Recoveries 3,613 3,169      
Provision for loan losses, LHFI 1,232 1,784      
Balance at end of period 1,821 2,822 2,766    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]          
Individually       128 259
Collectively       1,693 2,822
Total $ 2,822 $ 2,822 $ 2,766 $ 1,821 $ 2,822