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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due $ 14,069 $ 19,200  
60 - 89 days past due 5,319 5,307  
90 days and greater and still accruing 2,447 11,015  
Nonaccrual 94,518 78,476  
Total past due and nonaccrual 116,353 113,998  
Current 4,088,351 3,929,645  
Loans 4,204,704 4,043,643 4,218,083
Commercial, financial, agricultural and other [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 991 5,433  
60 - 89 days past due 620 824  
90 days and greater and still accruing 288 287  
Nonaccrual 29,258 33,459  
Total past due and nonaccrual 31,157 40,003  
Current 988,665 956,736  
Loans 1,019,822 996,739  
Real estate construction [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 2 0  
60 - 89 days past due 19 180  
90 days and greater and still accruing 15 0  
Nonaccrual 9,778 14,911  
Total past due and nonaccrual 9,814 15,091  
Current 77,624 61,473  
Loans 87,438 76,564  
Residential real estate [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 6,597 7,144  
60 - 89 days past due 2,357 2,100  
90 days and greater and still accruing 730 8,767  
Nonaccrual 9,283 3,153  
Total past due and nonaccrual 18,967 21,164  
Current 1,222,598 1,115,895  
Loans 1,241,565 1,137,059  
Commercial real estate [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 3,339 3,671  
60 - 89 days past due 1,389 1,241  
90 days and greater and still accruing 195 157  
Nonaccrual 46,023 26,953  
Total past due and nonaccrual 50,946 32,022  
Current 1,222,715 1,235,410  
Loans 1,273,661 1,267,432  
Loans to individuals [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 3,140 2,952  
60 - 89 days past due 934 962  
90 days and greater and still accruing 1,219 1,804  
Nonaccrual 176 0  
Total past due and nonaccrual 5,469 5,718  
Current 576,749 560,131  
Loans $ 582,218 $ 565,849