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Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 4,218,810 $ 4,204,704 $ 4,128,588
Commercial, financial, agricultural and other [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,057,663 1,019,822  
Real estate construction [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 70,461 87,438  
Residential real estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,255,515 1,241,565  
Commercial real estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,243,676 1,273,661  
Loans to individuals [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 591,495 $ 582,218