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Loans and Allowance for Loan Losses - Additional Information (Detail)
6 Months Ended
Jun. 30, 2017
USD ($)
SecurityLoan
Jun. 30, 2016
USD ($)
SecurityLoan
Dec. 31, 2016
USD ($)
May 01, 2016
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]        
Commercial real estate $ 3,259,998,000 $ 2,943,525,000 $ 3,130,853,000  
Total loans $ 9,232,040,000 8,830,158,000 9,010,512,000  
Loan placed on nonaccrual when past due, number of days 90 days      
Loan participations $ 512,800,000      
Loan participations sold 265,500,000      
Loan participations retained $ 247,300,000      
Troubled debt restructuring term 6 months      
Minimum number of days for loan charge off to be recorded 120 days      
Maximum number of days for loan charge off to be recorded 180 days      
Nonaccrual period for loans 90 days      
Financing receivable TDR's included with non-accrual loans $ 46,200,000   26,300,000  
Financing receivable troubled debt restructurings specific reserves 7,300,000   4,000,000  
Unfunded commitments on TDRs 1,000,000      
Increase (decrease) in allowance for loan losses 3,400,000 (1,200,000)    
Allowance for loan losses charge-offs $ 0 600,000    
Number of days for a loan to be considered to be in payment default 90 days      
Number of loans modified as TDRs | SecurityLoan 0      
Troubled debt restructurings which was a payment default   800,000    
Outstanding loans including principal, interest, fees and penalties $ 249,400,000   268,000,000  
Accretion recorded as loan interest income 7,300,000 $ 13,000,000    
Financing receivable allowance for loan losses related to purchased loans 400,000   300,000  
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 1,871,047,000   1,875,030,000  
Commercial Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 3,259,998,000   3,130,853,000  
Anchor BanCorp Wisconsin Inc [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Commercial real estate       $ 926,200,000
Anchor BanCorp Wisconsin Inc [Member] | Consumer [Member] | Student Loan [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans $ 72,200,000      
Anchor BanCorp Wisconsin Inc [Member] | Commercial Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Percentage of risk-based capital 188.00%      
Regulatory guideline limit 300.00%      
Credit Concentration Risk [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Concentration Risk Percentage 10.00%      
Maximum [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Value of small commercial loans on nonaccrual status or 90 days or more delinquent $ 250,000      
Maximum [Member] | Anchor BanCorp Wisconsin Inc [Member] | Consumer [Member] | Student Loan [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loan guarantee percentage 100.00%      
Minimum [Member] | Anchor BanCorp Wisconsin Inc [Member] | Consumer [Member] | Student Loan [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loan guarantee percentage 97.00%      
Commercial Loan [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans $ 2,001,621,000   $ 1,917,099,000  
Number of loans modified as TDRs | SecurityLoan   10    
Commercial Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Number of loans modified as TDRs | SecurityLoan   3