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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
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due $ 9,390 $ 8,690  
60 - 89 days past due 2,841 1,856  
90 days and greater and still accruing 2,450 2,505  
Nonaccrual 45,680 45,888  
Total past due and nonaccrual 60,361 58,939  
Current 4,191,852 4,224,894  
Total 4,252,213 4,283,833 4,218,810
Commercial, financial, agricultural and other [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 971 594  
60 - 89 days past due 490 319  
90 days and greater and still accruing 300 185  
Nonaccrual 28,268 23,631  
Total past due and nonaccrual 30,029 24,729  
Current 987,383 996,327  
Total 1,017,412 1,021,056  
Real estate construction [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 40 0  
60 - 89 days past due 0 0  
90 days and greater and still accruing 0 0  
Nonaccrual 1,698 2,567  
Total past due and nonaccrual 1,738 2,567  
Current 93,372 90,722  
Total 95,110 93,289  
Residential real estate [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 4,265 4,002  
60 - 89 days past due 1,004 524  
90 days and greater and still accruing 746 1,041  
Nonaccrual 10,011 10,520  
Total past due and nonaccrual 16,026 16,087  
Current 1,224,143 1,246,631  
Total 1,240,169 1,262,718  
Commercial Real Estate [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 2,020 1,199  
60 - 89 days past due 665 23  
90 days and greater and still accruing 21 13  
Nonaccrual 5,526 8,966  
Total past due and nonaccrual 8,232 10,201  
Current 1,282,620 1,286,271  
Total 1,290,852 1,296,472  
Loans to individuals [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30 - 59 days past due 2,094 2,895  
60 - 89 days past due 682 990  
90 days and greater and still accruing 1,383 1,266  
Nonaccrual 177 204  
Total past due and nonaccrual 4,336 5,355  
Current 604,334 604,943  
Total $ 608,670 $ 610,298