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Non-Covered Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Activity Related to Non-Covered Loans Held-for-Sale (Detail) (Non-Covered Loans Held-for-Sale Activity [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Non-Covered Loans Held-for-Sale Activity [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period   $ 348
Originations of mortgage loans 485 25,489
Sales of mortgage loans (485) (22,250)
Transfer of mortgage loans to held for investment   (3,587)
Sales of other loans      
Transfers of other loans to held for sale 3,667  
Write-down of loans held for sale      
Balance, end of period $ 3,667