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Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 4,240,004	$ 4,204,704	$ 4,214,299
Commercial, financial, agricultural and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,008,316	1,019,822	1,087,019
Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	74,025	87,438	95,425
Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,280,990	1,241,565	1,228,328
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,272,366	1,273,661	1,217,249
Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 604,307	$ 582,218	$ 586,278

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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