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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance $ 61,676 $ 75,166 $ 61,234 $ 71,229  
Charge-offs (4,670) (10,346) (13,411) (30,148)  
Recoveries 354 322 1,453 1,132  
Provision 6,754 6,975 14,838 29,904  
Ending Balance 64,114 72,117 64,114 72,117  
Ending balance: individually evaluated for impaired 12,914 34,899 12,914 34,899  
Ending balance: collectively evaluated for impaired 51,200 37,218 51,200 37,218  
Ending balance 4,214,299 3,973,723 4,214,299 3,973,723 4,043,643
Ending balance: individually evaluated for impaired 88,853 157,360 88,853 157,360  
Ending balance: collectively evaluated for impaired 4,125,446 3,816,363 4,125,446 3,816,363  
Commercial, financial, agricultural and other [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 19,302 23,175 18,200 21,700  
Charge-offs (1,271) (685) (4,939) (3,642)  
Recoveries 74 74 349 335  
Provision (25) (3,975) 4,470 196  
Ending Balance 18,080 18,589 18,080 18,589  
Ending balance: individually evaluated for impaired 7,306 10,503 7,306 10,503  
Ending balance: collectively evaluated for impaired 10,774 8,086 10,774 8,086  
Ending balance 1,087,019 950,547 1,087,019 950,547  
Ending balance: individually evaluated for impaired 32,833 37,738 32,833 37,738  
Ending balance: collectively evaluated for impaired 1,054,186 912,809 1,054,186 912,809  
Real estate construction [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 8,001 17,701 6,756 18,002  
Charge-offs (2,016) (6,522) (2,356) (14,570)  
Recoveries 29 0 121 0  
Provision 2,848 4,237 4,341 11,984  
Ending Balance 8,862 15,416 8,862 15,416  
Ending balance: individually evaluated for impaired 973 12,551 973 12,551  
Ending balance: collectively evaluated for impaired 7,889 2,865 7,889 2,865  
Ending balance 95,425 97,354 95,425 97,354  
Ending balance: individually evaluated for impaired 11,427 35,957 11,427 35,957  
Ending balance: collectively evaluated for impaired 83,998 61,397 83,998 61,397  
Residential real estate [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 6,619 6,870 8,237 5,454  
Charge-offs (530) (986) (2,984) (2,686)  
Recoveries 49 22 331 118  
Provision 566 750 1,120 3,770  
Ending Balance 6,704 6,656 6,704 6,656  
Ending balance: individually evaluated for impaired 719 171 719 171  
Ending balance: collectively evaluated for impaired 5,985 6,485 5,985 6,485  
Ending balance 1,228,328 1,096,339 1,228,328 1,096,339  
Ending balance: individually evaluated for impaired 7,224 2,290 7,224 2,290  
Ending balance: collectively evaluated for impaired 1,221,104 1,094,049 1,221,104 1,094,049  
Commercial real estate portfolio segment [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 17,638 18,780 18,961 16,913  
Charge-offs (97) (1,343) (638) (6,918)  
Recoveries 70 75 256 239  
Provision 2,823 5,165 1,855 12,443  
Ending Balance 20,434 22,677 20,434 22,677  
Ending balance: individually evaluated for impaired 3,916 11,674 3,916 11,674  
Ending balance: collectively evaluated for impaired 16,518 11,003 16,518 11,003  
Ending balance 1,217,249 1,284,720 1,217,249 1,284,720  
Ending balance: individually evaluated for impaired 37,369 81,375 37,369 81,375  
Ending balance: collectively evaluated for impaired 1,179,880 1,203,345 1,179,880 1,203,345  
Loans to individuals [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 4,209 3,870 4,244 4,215  
Charge-offs (756) (810) (2,494) (2,332)  
Recoveries 132 151 396 440  
Provision 635 820 2,074 1,708  
Ending Balance 4,220 4,031 4,220 4,031  
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 4,220 4,031 4,220 4,031  
Ending balance 586,278 544,763 586,278 544,763  
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 586,278 544,763 586,278 544,763  
Unallocated [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning Balance 5,907 4,770 4,836 4,945  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (93) (22) 978 (197)  
Ending Balance 5,814 4,748 5,814 4,748  
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired $ 5,814 $ 4,748 $ 5,814 $ 4,748