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Loans and Allowance for Credit Losses - Outstanding Balances of Loan (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 4,229,752	$ 4,204,704	$ 4,159,531
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,012,315	1,019,822	1,059,675
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	66,243	87,438	77,442
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,269,830	1,241,565	1,213,610
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,280,784	1,273,661	1,232,270
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 600,580	$ 582,218	$ 576,534

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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