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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance $ 54,225 $ 67,187  
Charge-offs (3,646) (10,476)  
Recoveries 696 1,054  
Provision for Loan, Lease, and Other Losses 3,231 4,497  
Ending Balance 54,506 62,262  
Ending balance: individually evaluated for impaired 10,503 12,689  
Ending balance: collectively evaluated for impaired 44,003 49,573  
Loans and Leases Receivable, Gross 4,252,213   4,283,833
Total 4,252,213 4,218,810 4,283,833
Ending balance: individually evaluated for impaired 49,403 71,421  
Ending balance: collectively evaluated for impaired 4,202,810 4,147,389  
Commercial, financial, agricultural and other [Member]
      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance 22,663 19,852  
Charge-offs (1,601) (538)  
Recoveries 85 128  
Provision for Loan, Lease, and Other Losses 4,978 833  
Ending Balance 26,125 20,275  
Ending balance: individually evaluated for impaired 9,886 9,846  
Ending balance: collectively evaluated for impaired 16,239 10,429  
Loans and Leases Receivable, Gross 1,017,412   1,021,056
Total   1,057,663  
Ending balance: individually evaluated for impaired 31,730 33,322  
Ending balance: collectively evaluated for impaired 985,682 1,024,341  
Real estate construction [Member]
      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance 6,600 8,928  
Charge-offs 0 (84)  
Recoveries 169 12  
Provision for Loan, Lease, and Other Losses (555) (1,123)  
Ending Balance 6,214 7,733  
Ending balance: individually evaluated for impaired 74 503  
Ending balance: collectively evaluated for impaired 6,140 7,230  
Loans and Leases Receivable, Gross 95,110   93,289
Total   70,461  
Ending balance: individually evaluated for impaired 2,797 8,917  
Ending balance: collectively evaluated for impaired 92,313 61,544  
Residential real estate [Member]
      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance 7,727 5,908  
Charge-offs (1,095) (322)  
Recoveries 244 723  
Provision for Loan, Lease, and Other Losses (850) (560)  
Ending Balance 6,026 5,749  
Ending balance: individually evaluated for impaired 496 1,091  
Ending balance: collectively evaluated for impaired 5,530 4,658  
Loans and Leases Receivable, Gross 1,240,169   1,262,718
Total   1,255,515  
Ending balance: individually evaluated for impaired 9,103 7,813  
Ending balance: collectively evaluated for impaired 1,231,066 1,247,702  
Commercial Real Estate [Member]
      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance 11,778 22,441  
Charge-offs (140) (8,544)  
Recoveries 20 97  
Provision for Loan, Lease, and Other Losses (539) 4,476  
Ending Balance 11,119 18,470  
Ending balance: individually evaluated for impaired 47 1,249  
Ending balance: collectively evaluated for impaired 11,072 17,221  
Loans and Leases Receivable, Gross 1,290,852   1,296,472
Total   1,243,676  
Ending balance: individually evaluated for impaired 5,773 21,369  
Ending balance: collectively evaluated for impaired 1,285,079 1,222,307  
Loans to individuals [Member]
      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance 5,457 4,132  
Charge-offs (810) (988)  
Recoveries 178 94  
Provision for Loan, Lease, and Other Losses 197 901  
Ending Balance 5,022 4,139  
Ending balance: individually evaluated for impaired 0 0  
Ending balance: collectively evaluated for impaired 5,022 4,139  
Loans and Leases Receivable, Gross 608,670   610,298
Total   591,495  
Ending balance: individually evaluated for impaired 0 0  
Ending balance: collectively evaluated for impaired 608,670 591,495  
Unallocated [Member]
      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance 0 5,926  
Charge-offs 0 0  
Recoveries 0 0  
Provision for Loan, Lease, and Other Losses 0 (30)  
Ending Balance 0 5,896  
Ending balance: individually evaluated for impaired 0 0  
Ending balance: collectively evaluated for impaired $ 0 $ 5,896