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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
Sep. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total covered gross loans $ 140,604 $ 173,104
Pass [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total covered gross loans 26,503 38,961
Watch List [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total covered gross loans 79,635 74,369
Special Mention [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total covered gross loans 6,542 15,492
Substandard [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total covered gross loans 27,924 44,241
Doubtful & Loss [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total covered gross loans $ 0 $ 41