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Composition of Loans Held-In-Portfolio (Parenthetical) (Detail) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]   
Loans held-in-portfolio, unearned income$ 101,351$ 106,241$ 106,685
Loans held-for-sale$ 368,777$ 893,938$ 115,088