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v3.25.1

Securities - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) Security | Mar. 31, 2024 USD ($) | Dec. 31, 2024 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 | $ 211,288,000 |  | $ 206,600,000
Number of securities in portfolio with unrealized losses | Security | 512 |  | 508
Available for sale term | 3 years |  |
Equity securities | $ 2,400,000 |  | $ 2,400,000
FHLBC stock | 20,800,000 |  | 18,500,000
FRBC stock | 11,500,000 |  | 11,500,000
Other securities | 32,592,000 |  | 30,352,000
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

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