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Non-Covered Loans 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 $)
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]    
Nonaccruing loans, current $ 23,900,000 $ 40,100,000
Nonaccruing loans, 30-59 days past due 473,000 2,600,000
Nonaccruing loans, 60-89 days past due 854,000  
Nonaccruing loans, 90+ days past due $ 14,700,000 $ 15,300,000