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v3.25.3

ACQUISITIONS AND DISPOSITIONS - Narrative (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 15, 2025 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) | Sep. 24, 2025 | Dec. 06, 2024 bankBranch
Business Combination [Line Items] |  |  |  |
Gain on branch sale | $ |  | $ 20.0 |  |
Subsequent Event |  |  |  |
Business Combination [Line Items] |  |  |  |
Share price (in dollars per share) | $ / shares | $ 37.00 |  |  |
Sale | Old Second Bancorp, Inc. Branch Sale |  |  |  |
Business Combination [Line Items] |  |  |  |
Number of branches | bankBranch |  |  |  | 5
First Savings Financial Group, Inc. |  |  |  |
Business Combination [Line Items] |  |  |  |
Exchange ratio |  |  | 0.85 |
First Savings Financial Group, Inc. | Subsequent Event |  |  |  |
Business Combination [Line Items] |  |  |  |
Business combination, share price (in dollars per share) | $ / shares | $ 31.45 |  |  |
Consideration to be paid | $ | $ 225.6 |  |  |
First Savings Financial Group, Inc. | Common Stock | Subsequent Event |  |  |  |
Business Combination [Line Items] |  |  |  |
Common stock outstanding acquired (in shares) | 7,010,008 |  |  |
Issuance of common stock related to acquisitions (in shares) | 5,960,000 |  |  |
First Savings Financial Group, Inc. | Restricted Stock | Subsequent Event |  |  |  |
Business Combination [Line Items] |  |  |  |
Common stock outstanding acquired (in shares) | 24,000 |  |  |

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