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Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 4,283,833 $ 4,204,704 $ 4,043,643
Commercial, financial, agricultural and other [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,021,056 1,019,822  
Real estate construction [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 93,289 87,438  
Residential real estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,262,718 1,241,565  
Commercial real estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,296,472 1,273,661  
Loans to individuals [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 610,298 $ 582,218