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Loans - Summary of Information Pertaining to Nonaccrual Noncovered Loans (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual non-covered acquired loans $ 24,759 $ 21,947
Non-Covered Acquired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual non-covered acquired loans 12,743 10,188
Non-Covered Acquired Loans [Member] | ASC 310-30 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual non-covered acquired loans $ 5,500 $ 3,400