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Securities - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2024
USD ($)
Security
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Security
Debt Securities, Available-for-Sale [Line Items]      
Proceeds from sale of debt securities available-for-sale $ 0 $ 0  
Gross realized gains 0 0  
Gross realized losses 0 $ 0  
Carrying value of pledged securities $ 210,563,000   $ 211,616,000
Number of securities in portfolio with unrealized losses | Security 387   394
Available for sale term 3 years    
Equity securities $ 2,300,000   $ 2,200,000
FHLBC stock 20,800,000   18,200,000
FRBC stock 11,500,000   11,500,000
Other securities 32,633,000   29,998,000
United Bankers Bancorp [Member]      
Debt Securities, Available-for-Sale [Line Items]      
Other securities 225,000   225,000
Farmer Mac [Member]      
Debt Securities, Available-for-Sale [Line Items]      
Other securities 42,000   42,000
Norwalk Community Development Corp [Member]      
Debt Securities, Available-for-Sale [Line Items]      
Other securities $ 2,000   $ 2,000