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Acquisitions - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
May 31, 2015
USD ($)
Branch
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
May 29, 2015
$ / shares
Business Acquisition [Line Items]            
Salaries and employee benefits   $ 108,897 $ 99,585 $ 216,047 $ 198,122  
Legal and consulting   $ 4,937 $ 5,917 9,736 $ 10,295  
Marquette [Member]            
Business Acquisition [Line Items]            
Percentage of outstanding common shares acquired in the acquisition 100.00%          
Conversion of Company's common stock due to merger | shares 9.2295          
Company's common shares issued | shares 3,470,000          
Market value common stock issued $ 179,700          
Closing stock price | $ / shares           $ 51.79
Loans purchased at fair value 980,400          
Long-term debt 89,971          
Fair value of acquired identifiable intangible assets 14,900          
Acquisition-related costs       4,000    
Salaries and employee benefits       880    
Legal and consulting       $ 1,600    
Marquette [Member] | Core deposit intangible assets [Member]            
Business Acquisition [Line Items]            
Fair value of acquired identifiable intangible assets 11,000          
Marquette [Member] | Customer Lists [Member]            
Business Acquisition [Line Items]            
Fair value of acquired identifiable intangible assets 2,900          
Marquette [Member] | Noncompete Agreements [Member]            
Business Acquisition [Line Items]            
Fair value of acquired identifiable intangible assets 1,000          
Marquette [Member] | Marquette Capital Trust I, Marquette Capital Trust II, Marquette Capital Trust III And Marquette Capital Trust IV [Member]            
Business Acquisition [Line Items]            
Long-term debt 103,100          
Long-term debt acquired at fair value $ 65,500          
Marquette [Member] | Trust Preferred Securities [Member] | Marquette Capital Trust I, Marquette Capital Trust III And Marquette Capital Trust IV [Member]            
Business Acquisition [Line Items]            
Interest rate description of trust preferred securities       LIBOR rate with spreads ranging from 133 basis points    
Minimum [Member] | Marquette [Member] | Trust Preferred Securities [Member] | Marquette Capital Trust I, Marquette Capital Trust III And Marquette Capital Trust IV [Member]            
Business Acquisition [Line Items]            
Interest rate of trust preferred securities 1.33%          
Maximum [Member] | Marquette [Member] | Trust Preferred Securities [Member] | Marquette Capital Trust I, Marquette Capital Trust III And Marquette Capital Trust IV [Member]            
Business Acquisition [Line Items]            
Interest rate of trust preferred securities 1.60%          
Commercial Specialty Lending Business [Member] | Marquette [Member]            
Business Acquisition [Line Items]            
Number of branches | Branch 2          
Arizona And Texas [Member] | Marquette [Member]            
Business Acquisition [Line Items]            
Number of branches | Branch 13