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Loan and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in Non-Covered Past Due and Nonaccrual Loans and Loans Past Due by Class of Loans (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Nonaccruing loans, current $ 23,700 $ 40,100
Nonaccruing loans, 30-59 days past due 487,000 2,600
Nonaccruing loans, 90+ days past due $ 25,300 $ 15,300