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Borrowings - Additional information (Details)
3 Months Ended 12 Months Ended
Feb. 24, 2020
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2016
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Dec. 31, 2018
USD ($)
Borrowings              
Securities available-for-sale, at fair value         $ 1,539,359,000 $ 1,693,632,000  
Threshold percentage of stockholders' equity         10.00%    
Borrowings at FHLBC as percentage of total assets         35.00%    
FHLBC stock         $ 5,600,000 7,100,000  
Federal Home Loan Bank Chicago ("FHLBC") and Federal Reserve Bank Chicago ("FRBC") stock         20,530,000 13,257,000  
Proceeds from term note $ 30,000,000.0            
Cash distribution rate of trust preferred securities (as a percent) 7.80%            
Senior notes         44,585,000 44,480,000  
Basis points added to reference rate (as a percent) 175.00%            
Outstanding, net of deferred issuance costs         59,300,000 59,200,000  
Debt issuance costs         1,000 1,000  
Total borrowings         260,811,000 198,876,000  
Asset Pledged as Collateral with Right | Securities sold under repurchase agreements              
Borrowings              
Investment securities pledged with financial institutions, dollars         71,400,000 113,000,000.0  
GCFC/ABC Bank              
Borrowings              
Debt assumed             $ 23,400,000
Balance of borrowings paid off   $ 5,900,000          
Securities sold under repurchase agreements              
Borrowings              
Investment securities pledged with financial institutions, dollars         $ 32,200,000 50,300,000  
Number of customers having secured balances exceeding specified percentage of stockholders equity | item         0    
Total borrowings         $ 32,156,000 50,337,000  
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              
Borrowings at FHLBC as percentage of book value of certain mortgage loans         60.00%    
FHLBC advance amount         $ 90,000,000.0 0  
FHLBC stock         5,600,000 7,100,000  
Principal balance of loans collateralized         969,100,000 572,600,000  
Maximum borrowing capacity           603,100,000  
Amount available for additional borrowings         513,100,000    
Subordinated debentures              
Borrowings              
Total borrowings         59,297,000 59,212,000  
Notes Payable to Banks [Member]              
Borrowings              
Total borrowings         9,000,000 19,074,000  
Junior subordinated debentures              
Borrowings              
Total borrowings         $ 25,773,000 25,773,000  
Senior Notes [Member]              
Borrowings              
Interest rate (as a percent)         5.75%    
Senior notes         $ 44,600,000 44,500,000  
Debt Instrument, Term       10 years      
Interest rate term         5 years    
Effective interest rate         8.62%    
Debt issuance costs         $ 415,000 520,000  
Amortization period for deferred financing costs         10 years    
Total borrowings         $ 44,585,000 $ 44,480,000  
Debt instrument redemption price, percentage         100.00%    
Senior Notes [Member] | 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 $ 20,000,000.0       $ 9,000,000.0    
Effective interest rate         6.14%    
Debt term         3 years    
Subordinated Notes Due 2031              
Borrowings              
Interest rate (as a percent)     3.50%        
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%