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Borrowings - Additional information (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Feb. 24, 2020
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Borrowings            
Threshold percentage of stockholders' equity       10.00%    
Borrowings at FHLBC as percentage of total assets       35.00%    
FHLBC stock $ 3,700,000     $ 7,100,000 $ 3,700,000  
Federal Home Loan Bank Chicago ("FHLBC") and Federal Reserve Bank Chicago ("FRBC") stock 9,917,000     13,257,000 9,917,000  
Fair value of securities collateralized       7,100,000    
Proceeds from term note 20,000,000.0 $ 20,000,000.0        
Cash distribution rate of trust preferred securities (as a percent)   7.80%        
Senior notes 44,375,000     44,480,000 44,375,000  
Basis points added to reference rate (as a percent)   175.00%        
Debt issuance costs 1,000     1,000 1,000  
Total borrowings 160,521,000     198,876,000 160,521,000  
GCFC/ABC Bank            
Borrowings            
FHLBC advance amount $ 6,400,000     $ 6,100,000 $ 6,400,000  
Debt Instrument, Term       4 years 3 months 5 years 3 months  
Debt assumed           $ 23,400,000
GCFC/ABC Bank | Maximum            
Borrowings            
Interest rate (as a percent) 2.83%     2.83% 2.83%  
Securities sold under repurchase agreements            
Borrowings            
Carrying amount of securities secured $ 67,000,000.0     $ 50,300,000 $ 67,000,000.0  
Fair value of the pledged collateral 94,400,000     $ 113,000,000.0 94,400,000  
Number of customers having secured balances exceeding specified percentage of stockholders equity | item       0    
Total borrowings 66,980,000     $ 50,337,000 66,980,000  
Securities sold under repurchase agreements | Minimum            
Borrowings            
Maturity       1 day    
Securities sold under repurchase agreements | Maximum            
Borrowings            
Maturity       90 days    
Federal Home Loan Bank Advances            
Borrowings            
FHLBC advance amount       $ 0    
FHLBC stock 3,700,000     7,100,000 3,700,000  
Fair value of securities collateralized 54,700,000       54,700,000  
Principal balance of loans collateralized 625,800,000     536,900,000 625,800,000  
Maximum borrowing capacity 390,400,000       390,400,000  
Amount available for additional borrowings       313,100,000    
Subordinated debentures            
Borrowings            
Total borrowings       59,212,000    
Notes payable and other borrowings            
Borrowings            
Total borrowings 23,393,000     19,074,000 23,393,000  
Junior subordinated debentures            
Borrowings            
Total borrowings 25,773,000     $ 25,773,000 25,773,000  
Senior notes            
Borrowings            
Interest rate (as a percent)       5.75%    
Senior notes 44,400,000     $ 44,500,000 44,400,000  
Debt Instrument, Term       10 years    
Interest rate term       5 years    
Effective interest rate       6.06%    
Debt issuance costs 625,000     $ 520,000 625,000  
Amortization period for deferred financing costs       10 years    
Total borrowings 44,375,000     $ 44,480,000 $ 44,375,000  
Debt instrument redemption price, percentage       100.00%    
Senior notes | Debt Instrument, Variable Rate Base LIBOR [Member]            
Borrowings            
Basis points added to reference rate (as a percent)       385.00%    
Term Debt            
Borrowings            
Proceeds from term note $ 13,000,000.0 $ 20,000,000.0        
Effective interest rate       1.85%    
Debt term       3 years    
Subordinated Notes Due 2031            
Borrowings            
Interest rate (as a percent)     3.50%      
Outstanding, net of deferred issuance costs       $ 59,200,000    
Face amount     $ 60,000,000.0      
Subordinated Notes Due 2031 | Three Months Secured Overnight Financing Rate            
Borrowings            
Basis points added to reference rate (as a percent)     2.73%