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Covered Assets and FDIC Loss Sharing Asset - Summary of Covered Loans by Internal Risk Ratings (Detail) (Covered Loans [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross covered loans $ 173,104 $ 220,559
Pass [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross covered loans 38,961 52,637
Watch List [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross covered loans 74,369 72,803
Special Mention [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross covered loans 15,492 31,689
Substandard [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross covered loans 44,241 63,354
Doubtful & Loss [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross covered loans $ 41 $ 76