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Loans in Non-Performing Status and Accruing Loans Past-Due 90 Days or More by Loan Class (Parenthetical) (Detail) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Financing Receivable, Recorded Investment, Past Due [Line Items]   
Loans held-for-sale$ 368,777$ 893,938$ 115,088
Credit Impaired Loans
   
Financing Receivable, Recorded Investment, Past Due [Line Items]   
Loans held-for-sale260672 
Credit Impaired Loans | Non Covered Loans [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]   
Loans held-for-sale$ 0