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Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross $ 4,252,213 $ 4,283,833
Commercial, financial, agricultural and other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,017,412 1,021,056
Real estate construction [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 95,110 93,289
Residential real estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,240,169 1,262,718
Commercial Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,290,852 1,296,472
Loans to individuals [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross $ 608,670 $ 610,298