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Acquisition of a Business - Additional Information (Details) - USD ($)
 12 Months Ended
May 15, 2019
Apr. 30, 2019
May 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]              
Goodwill       $ 148,353,000 $ 128,177,000 $ 54,562,000 $ 51,975,000
Oak Park River Forest Bankshares, Inc.              
Business Acquisition [Line Items]              
Business acquisition date of agreement       Apr. 30, 2019      
Right to receive common stock upon conversion   7.9321          
Consideration paid in cash $ 4,200,000 $ 6,163,000          
Common stock outstanding value per share   $ 33.375          
Common stock issued price per share   $ 20.02          
Issuance of common shares   1,464,558          
Value of common stock consideration   $ 29,300,000          
Options to acquire common stock shares   35,870          
Option to acquire common stock value   $ 4,200,000          
Total merger consideration   35,483,000          
Stock issuance costs   585,000          
Goodwill   $ 20,176,000          
Fair value estimate of loans       $ 3,700,000      
Fair value estimate of other assets       25,000      
Increase in deferred tax asset       1,000,000      
Increase in goodwill       2,700,000      
Oak Park River Forest Bankshares, Inc. | Non-interest Expense              
Business Acquisition [Line Items]              
Acquisition advisory expenses       2,300,000      
Core system conversion expenses       $ 2,000,000 335,000    
First Evanston Bancorp, Inc.              
Business Acquisition [Line Items]              
Business acquisition date of agreement       May 31, 2018      
Right to receive common stock upon conversion     3.994        
Consideration paid in cash     $ 27,004,000        
Common stock outstanding value per share     $ 16.136        
Common stock issued price per share     $ 21.62        
Issuance of common shares     6,682,850        
Value of common stock consideration     $ 144,500,000        
Options to acquire common stock shares     144,090        
Option to acquire common stock value     $ 7,600,000        
Total merger consideration     179,131,000        
Stock issuance costs     852,000        
Goodwill     $ 73,615,000        
Options to acquire conversion of common stock shares     680,787        
First Evanston Bancorp, Inc. | Non-interest Expense              
Business Acquisition [Line Items]              
Acquisition advisory expenses         1,700,000 $ 1,300,000  
Core system conversion expenses       $ 2,000,000 $ 9,800,000