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Acquisition and Divestiture Activity - Schedule of Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
May 01, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Deposits $ (10,451,602)   $ (8,400,860) $ (8,809,570)  
Goodwill $ 655,523   584,634 $ 588,464 $ 530,845
Founders Financial Corporation [Member]          
Business Acquisition [Line Items]          
Cash and cash equivalents     3,978    
Investment securities     75,383    
Federal Home Loan Bank stock     1,810    
Loans held for sale     3,473    
Loans     339,569    
Premises and equipment     3,604    
Accrued interest receivable     1,260    
Other real estate owned     674    
Company-owned life insurance     8,297    
Other assets     8,804    
Deposits     (376,656)    
Other borrowings     (39,380)    
Accrued expenses and other liabilities     (1,307)    
Net tangible assets acquired     29,509    
Definite-lived intangible assets acquired     5,515    
Loan servicing rights     664    
Goodwill     56,014    
Purchase price     $ 91,702    
Anchor BanCorp Wisconsin Inc [Member]          
Business Acquisition [Line Items]          
Cash and cash equivalents   $ 123,657      
Investment securities   235,240      
Federal Home Loan Bank stock   4,596      
Loans held for sale   9,334      
Loans   1,636,605      
Premises and equipment   35,721      
Accrued interest receivable   7,308      
Other real estate owned   18,243      
Company-owned life insurance   7,278      
Other assets   126,013      
Deposits   (1,852,713)      
Other borrowings   (3,255)      
Accrued expenses and other liabilities   (36,958)      
Net tangible assets acquired   311,069      
Definite-lived intangible assets acquired   21,559      
Loan servicing rights   15,274      
Goodwill   111,852      
Purchase price   $ 459,754