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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance $ 61,234,000 $ 71,229,000 $ 81,639,000
Charge-offs (16,969,000) (68,293,000) (75,309,000)
Recoveries 2,378,000 2,482,000 3,347,000
Provision 20,544,000 55,816,000 61,552,000
Ending Balance 67,187,000 61,234,000 71,229,000
Ending balance: individually evaluated for impaired 17,778,000 13,236,000 23,907,000
Ending balance: collectively evaluated for impaired 49,409,000 47,998,000 47,322,000
Ending balance 4,204,704,000 4,043,643,000 4,218,083,000
Ending balance: individually evaluated for impaired 100,187,000 94,744,000 113,874,000
Ending balance: collectively evaluated for impaired 4,104,517,000 3,948,899,000 4,104,209,000
Commercial, financial, agricultural and other [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 18,200,000 21,700,000 31,369,000
Charge-offs (5,207,000) (7,114,000) (22,293,000)
Recoveries 443,000 473,000 2,409,000
Provision 6,416,000 3,141,000 10,215,000
Ending Balance 19,852,000 18,200,000 21,700,000
Ending balance: individually evaluated for impaired 10,331,000 9,069,000 6,709,000
Ending balance: collectively evaluated for impaired 9,521,000 9,131,000 14,991,000
Ending balance 1,019,822,000 996,739,000 913,814,000
Ending balance: individually evaluated for impaired 33,443,000 37,639,000 25,694,000
Ending balance: collectively evaluated for impaired 986,379,000 959,100,000 888,120,000
Real estate construction [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 6,756,000 18,002,000 18,224,000
Charge-offs (3,601,000) (28,886,000) (41,483,000)
Recoveries 582,000 955,000 0
Provision 5,191,000 16,685,000 41,261,000
Ending Balance 8,928,000 6,756,000 18,002,000
Ending balance: individually evaluated for impaired 300,000 2,960,000 11,855,000
Ending balance: collectively evaluated for impaired 8,628,000 3,796,000 6,147,000
Ending balance 87,438,000 76,564,000 261,482,000
Ending balance: individually evaluated for impaired 11,177,000 14,667,000 44,485,000
Ending balance: collectively evaluated for impaired 76,261,000 61,897,000 216,997,000
Residential real estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 8,237,000 5,454,000 5,847,000
Charge-offs (3,828,000) (4,107,000) (5,226,000)
Recoveries 422,000 132,000 252,000
Provision 1,077,000 6,758,000 4,581,000
Ending Balance 5,908,000 8,237,000 5,454,000
Ending balance: individually evaluated for impaired 780,000 93,000 56,000
Ending balance: collectively evaluated for impaired 5,128,000 8,144,000 5,398,000
Ending balance 1,241,565,000 1,137,059,000 1,127,273,000
Ending balance: individually evaluated for impaired 6,444,000 2,606,000 832,000
Ending balance: collectively evaluated for impaired 1,235,121,000 1,134,453,000 1,126,441,000
Commercial real estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 18,961,000 16,913,000 17,526,000
Charge-offs (851,000) (24,861,000) (2,466,000)
Recoveries 410,000 349,000 163,000
Provision 3,921,000 26,560,000 1,690,000
Ending Balance 22,441,000 18,961,000 16,913,000
Ending balance: individually evaluated for impaired 6,367,000 1,114,000 5,287,000
Ending balance: collectively evaluated for impaired 16,074,000 17,847,000 11,626,000
Ending balance 1,273,661,000 1,267,432,000 1,354,074,000
Ending balance: individually evaluated for impaired 49,123,000 39,832,000 42,863,000
Ending balance: collectively evaluated for impaired 1,224,538,000 1,227,600,000 1,311,211,000
Loans to individuals [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 4,244,000 4,215,000 4,731,000
Charge-offs (3,482,000) (3,325,000) (3,841,000)
Recoveries 521,000 573,000 523,000
Provision 2,849,000 2,781,000 2,802,000
Ending Balance 4,132,000 4,244,000 4,215,000
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 4,132,000 4,244,000 4,215,000
Ending balance 582,218,000 565,849,000 561,440,000
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 582,218,000 565,849,000 561,440,000
Unallocated [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 4,836,000 4,945,000 3,942,000
Charge-offs 0 0 0
Recoveries 0 0 0
Provision 1,090,000 (109,000) 1,003,000
Ending Balance 5,926,000 4,836,000 4,945,000
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired $ 5,926,000 $ 4,836,000 $ 4,945,000