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Loan Participations and Servicing - Amounts of Loans Participated (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Loans Receivable [Line Items]    
Total principal amount outstanding $ 42,020 $ 30,069
less: principal amount derecognized (20,901) (13,898)
Principal amount included in loans on the balance sheet $ 21,119 $ 16,171