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Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans and Commitments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Impaired [Line Items]      
Accrual status $ 13,037 $ 20,276 $ 1,336
Nonaccrual status 50,979 44,841 31,410
Total 64,016 65,117 32,746
Letters of credit 1,574 12,580 11,321
Unused lines of credit 0 42 1,095
Total $ 1,574 $ 12,622 $ 12,416