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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance $ 52,051 $ 54,225 $ 67,187
Charge-offs (18,868) (17,472) (35,178)
Recoveries 2,681 4,102 2,989
Provision for credit losses 14,948 11,196 19,227
Ending Balance 50,812 52,051 54,225
Ending balance: individually evaluated for impaired 7,045 9,461 8,824
Ending balance: collectively evaluated for impaired 43,767 42,590 45,401
Ending balance 4,683,750 4,457,308 4,283,833
Ending balance: individually evaluated for impaired 44,009 48,442 52,595
Ending balance: collectively evaluated for impaired 4,639,741 4,408,866 4,231,238
Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 29,627 22,663 19,852
Charge-offs (11,429) (8,911) (18,399)
Recoveries 1,097 734 455
Provision for credit losses 11,740 15,141 20,755
Ending Balance 31,035 29,627 22,663
Ending balance: individually evaluated for impaired 6,952 9,304 7,364
Ending balance: collectively evaluated for impaired 24,083 20,323 15,299
Ending balance 1,150,906 1,052,109 1,021,056
Ending balance: individually evaluated for impaired 30,767 33,332 27,251
Ending balance: collectively evaluated for impaired 1,120,139 1,018,777 993,805
Real estate construction [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 2,063 6,600 8,928
Charge-offs (8) (296) (773)
Recoveries 84 1,340 501
Provision for credit losses (1,252) (5,581) (2,056)
Ending Balance 887 2,063 6,600
Ending balance: individually evaluated for impaired 0 0 94
Ending balance: collectively evaluated for impaired 887 2,063 6,506
Ending balance 220,736 120,785 93,289
Ending balance: individually evaluated for impaired 0 193 3,844
Ending balance: collectively evaluated for impaired 220,736 120,592 89,445
Residential real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 3,664 7,727 5,908
Charge-offs (1,539) (3,153) (1,814)
Recoveries 587 650 1,264
Provision for credit losses (106) (1,560) 2,369
Ending Balance 2,606 3,664 7,727
Ending balance: individually evaluated for impaired 51 56 1,282
Ending balance: collectively evaluated for impaired 2,555 3,608 6,445
Ending balance 1,224,465 1,226,344 1,262,718
Ending balance: individually evaluated for impaired 6,099 7,127 9,349
Ending balance: collectively evaluated for impaired 1,218,366 1,219,217 1,253,369
Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 11,881 11,778 22,441
Charge-offs (1,538) (1,148) (10,513)
Recoveries 229 612 136
Provision for credit losses 1,352 639 (286)
Ending Balance 11,924 11,881 11,778
Ending balance: individually evaluated for impaired 42 101 84
Ending balance: collectively evaluated for impaired 11,882 11,780 11,694
Ending balance 1,479,000 1,405,256 1,296,472
Ending balance: individually evaluated for impaired 7,143 7,790 12,151
Ending balance: collectively evaluated for impaired 1,471,857 1,397,466 1,284,321
Loans to individuals [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 4,816 5,457 4,132
Charge-offs (4,354) (3,964) (3,679)
Recoveries 684 766 633
Provision for credit losses 3,214 2,557 4,371
Ending Balance 4,360 4,816 5,457
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 4,360 4,816 5,457
Ending balance 608,643 652,814 610,298
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired $ 608,643 652,814 610,298
Unallocated [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance   $ 0 5,926
Charge-offs     0
Recoveries     0
Provision for credit losses     (5,926)
Ending Balance     0
Ending balance: individually evaluated for impaired     0
Ending balance: collectively evaluated for impaired     $ 0