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Acquisition and Divestiture Activity - Schedule of Preliminary Purchase Price Allocation (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]        
Loans $ 5,024,728 $ 5,035,819 $ 5,058,561  
Deposits (7,258,162) (7,210,903) (7,066,319)  
Goodwill 352,729 352,729 338,820 338,820
Bank of America [Member]
       
Business Acquisition [Line Items]        
Cash and equivalents 562,906      
Loans 5,638      
Premises and equipment 12,559      
Accrued interest receivable 15      
Other assets 331      
Deposits (565,106)      
Accrued expenses and other liabilities (246)      
Net tangible assets acquired 16,097      
Definite-lived intangible assets acquired 3,462      
Goodwill 13,347      
Purchase price $ 32,906