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Income Taxes - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 01, 2017
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax [Line Items]            
Corporate federal income tax rate       21.00% 21.00% 35.00%
Net income tax expense (benefit)     $ 7,200,000   $ (760,000)  
Reclassification of certain income tax effects from accumulated other comprehensive income (loss)         (763,000)  
Deferred tax assets, net       $ 38,300,000 35,600,000  
Operating loss carryforwards, limitations on use       Pursuant to Sections 382 and 383 of the Internal Revenue Code, annual use of net operating loss and credit carryforwards may be limited in the event a cumulative change in ownership of more than 50 percent occurs within a threeyear period.    
Cumulative change in ownership Percentage       50.00%    
Period for cumulative change in ownership       3 years    
Estimated net operating losses available each year       $ 756,000    
Oak Park River Forest Bankshares, Inc.            
Income Tax [Line Items]            
Increase in deferred tax assets, net       5,900,000    
Estimated net operating losses available each year       781,000    
Net operating loss carryforwards       4,300,000    
ASU 2018-02            
Income Tax [Line Items]            
Reclassification of certain income tax effects from accumulated other comprehensive income (loss)       763,000    
State            
Income Tax [Line Items]            
Net operating loss carryforwards       $ 307,705,000 $ 340,999,000  
Illinois | State            
Income Tax [Line Items]            
Corporate income tax rate 7.00% 5.25%        
State income tax benefit due to increased value of deferred tax asset related to net loss deduction           $ 4,800,000