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Borrowings - Additional information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 24, 2023
USD ($)
Dec. 31, 2016
Jun. 30, 2023
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2024
USD ($)
customer
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Borrowings              
Threshold percentage of stockholders' equity         10.00%    
Borrowings at FHLBC as percentage of total assets         35.00%    
FHLBC stock         $ 4,500 $ 18,500  
Proceeds from term note         30,000    
Repayment of term note           9,000 $ 4,000
Outstanding, net of deferred issuance costs         59,500 59,400  
Asset Pledged as Collateral with Right | Securities sold under repurchase agreements              
Borrowings              
Investment securities pledged with financial institutions, dollars         73,600 45,700  
Securities sold under repurchase agreements              
Borrowings              
Investment securities pledged with financial institutions, dollars         $ 36,700 26,500  
Number of customers having secured balances exceeding specified percentage of stockholders equity | customer         0    
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         $ 20,000 405,000  
FHLBC stock         4,500 18,500  
Principal balance of loans collateralized         1,410,000 $ 1,460,000  
Maximum borrowing capacity         942,800,000    
Combined collateral value         942,800    
Amount available for additional borrowings         $ 922,800    
Senior notes              
Borrowings              
Interest rate (as a percent)   5.75%          
Debt Instrument, Term   10 years          
Interest rate term   5 years          
Debt issuance costs     $ 362        
Debt instrument redemption price, percentage     12.85%        
Debt redeemed amount     $ 45,000        
Term Debt              
Borrowings              
Repayment of term note $ 9,000            
Face amount $ 20,000            
Subordinated Notes Due 2031              
Borrowings              
Interest rate (as a percent)       3.50%      
Face amount       $ 60,000      
Subordinated Notes Due 2031 | Three Months Secured Overnight Financing Rate              
Borrowings              
Basis points added to reference rate (as a percent)       2.73%