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Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in, and Aging of, Non-Covered Past Due and Nonaccrual Loans by Class of Loans (Parenthetical) (Detail) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Receivables [Abstract]    
Nonaccruing loans, current $ 22,700,000 $ 23,900,000
Nonaccruing loans, 30-59 days past due 3,200,000 473,000
Nonaccruing loans, 60-89 days past due 13,000 854,000
Nonaccruing loans, 90+ days past due $ 11,200,000 $ 14,700,000