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Business Combinations (Narrative) (Details)
12 Months Ended 72 Months Ended
Jul. 24, 2015
USD ($)
locations
Jul. 17, 2015
USD ($)
locations
Jul. 02, 2015
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Jan. 16, 2015
USD ($)
locations
Aug. 08, 2014
USD ($)
locations
Jul. 11, 2014
USD ($)
May. 16, 2014
USD ($)
Apr. 28, 2014
USD ($)
Oct. 18, 2013
USD ($)
locations
Oct. 02, 2013
USD ($)
May. 01, 2013
USD ($)
locations
Feb. 01, 2013
USD ($)
Dec. 31, 2015
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Sep. 30, 2013
USD ($)
locations
Dec. 31, 2015
locations
Jul. 01, 2015
USD ($)
locations
Business Acquisition [Line Items]                                
Additional goodwill recorded on acquisition                         $ 69,860,000      
FDIC loss sharing percentage on purchased loans, OREO, and certain other assets                         80.00%      
Second Federal                                
Business Acquisition [Line Items]                                
Disposal Date                       Feb. 01, 2013        
Divestiture of Businesses, Deposits Disposed                       $ 149,000,000        
Community Financial Shares Inc.                                
Business Acquisition [Line Items]                                
Date of acquisition Jul. 24, 2015                              
Number of locations | locations 4                              
Fair value of assets acquired, at the acquisition date $ 350,500,000                              
Fair value of loans acquired, at the acquisition date 159,500,000                              
Fair value of deposits 290,000,000                              
Additional goodwill recorded on acquisition $ 27,600,000                              
Suburban Illinois Bancorp                                
Business Acquisition [Line Items]                                
Date of acquisition   Jul. 17, 2015                            
Number of locations | locations   10                            
Fair value of assets acquired, at the acquisition date   $ 494,700,000                            
Fair value of loans acquired, at the acquisition date   257,800,000                            
Fair value of deposits   416,700,000                            
Additional goodwill recorded on acquisition   $ 18,800,000                            
North Bank                                
Business Acquisition [Line Items]                                
Date of acquisition     Jul. 01, 2015                          
Number of locations | locations                               2
Fair value of assets acquired, at the acquisition date                               $ 117,900,000
Fair value of loans acquired, at the acquisition date                               51,600,000
Fair value of deposits                               $ 101,000,000
Additional goodwill recorded on acquisition     $ 6,700,000                          
Delavan Bancshares                                
Business Acquisition [Line Items]                                
Date of acquisition       Jan. 16, 2015                        
Number of locations | locations       4                        
Fair value of assets acquired, at the acquisition date       $ 224,100,000                        
Fair value of loans acquired, at the acquisition date       128,000,000                        
Fair value of liabilities assumed, at the acquisition date       186,400,000                        
Fair value of deposits       170,200,000                        
Additional goodwill recorded on acquisition       $ 16,800,000                        
THE National Bank                                
Business Acquisition [Line Items]                                
Date of acquisition           Jul. 11, 2014                    
Fair value of assets acquired, at the acquisition date           $ 94,100,000                    
Fair value of loans acquired, at the acquisition date           75,000,000                    
Fair value of deposits           36,200,000                    
Additional goodwill recorded on acquisition           $ 16,300,000                    
Urban Partnership Bank, Stone Park Branch                                
Business Acquisition [Line Items]                                
Date of acquisition             May 16, 2014                  
Fair value of liabilities assumed, at the acquisition date             $ 5,500,000                  
Fair value of deposits             5,400,000                  
Additional goodwill recorded on acquisition             $ 678,000                  
Diamond Bancorp, Inc.                                
Business Acquisition [Line Items]                                
Date of acquisition                 Oct. 18, 2013              
Number of locations | locations                 4              
Fair value of assets acquired, at the acquisition date                 $ 172,500,000              
Fair value of loans acquired, at the acquisition date                 91,700,000              
Fair value of liabilities assumed, at the acquisition date                 169,100,000              
Fair value of deposits                 140,200,000              
Additional goodwill recorded on acquisition                 $ 8,400,000              
First Lansing Bancorp, Inc.                                
Business Acquisition [Line Items]                                
Date of acquisition                     May 01, 2013          
Fair value of assets acquired, at the acquisition date                     $ 373,400,000          
Fair value of loans acquired, at the acquisition date                     123,000,000          
Fair value of liabilities assumed, at the acquisition date                     334,700,000          
Fair value of deposits                     331,400,000          
Additional goodwill recorded on acquisition                     $ 14,000,000          
First Lansing Bancorp, Inc. | South and Southwest Suburbs of Chicago, Illinois                                
Business Acquisition [Line Items]                                
Number of locations | locations                     7          
First Lansing Bancorp, Inc. | Northwest Indiana                                
Business Acquisition [Line Items]                                
Number of locations | locations                     1          
FDIC Assisted                                
Business Acquisition [Line Items]                                
Number of FDIC-assisted banks acquired | locations                             9  
Policy Billing Services Inc. And Equity Premium Finance Inc.                                
Business Acquisition [Line Items]                                
Date of acquisition               Apr. 28, 2014                
Fair value of loans acquired, at the acquisition date               $ 7,400,000                
Additional goodwill recorded on acquisition               $ 6,500,000                
Number of Affiliated Companies Acquired               2                
Surety Financial Services                                
Business Acquisition [Line Items]                                
Date of acquisition                   Oct. 01, 2013            
Number of locations | locations                           5    
Additional goodwill recorded on acquisition                   $ 9,500,000            
Mortgage Loan Originations                           $ 1,000,000,000    
Community Banking                                
Business Acquisition [Line Items]                                
Additional goodwill recorded on acquisition                         $ 69,860,000      
Community Banking | Talmer Bank & Trust                                
Business Acquisition [Line Items]                                
Date of acquisition         Aug. 08, 2014                      
Number of locations | locations         11                      
Fair value of assets acquired, at the acquisition date         $ 361,300,000                      
Fair value of loans acquired, at the acquisition date         41,500,000                      
Fair value of liabilities assumed, at the acquisition date         361,300,000                      
Fair value of deposits         354,900,000                      
Additional goodwill recorded on acquisition         $ 9,700,000                      
Wealth Management                                
Business Acquisition [Line Items]                                
Additional goodwill recorded on acquisition                         $ 0      
Wealth Management | Talmer Bank & Trust                                
Business Acquisition [Line Items]                                
Date of acquisition         Aug. 08, 2014                      
Additional goodwill recorded on acquisition         $ 250,000