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ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2022 USD ($) banking_center $ / shares shares | Dec. 31, 2024 USD ($) bankBranch $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) | Dec. 06, 2024 bankBranch | Mar. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |  |
Gain on branch sale |  | $ 19,983 | $ 0 | $ 0 |  |
Cash paid in acquisition |  | $ 0 | 0 | 79,324 |  |
Demand and savings deposits |  |  | $ 299,800 |  |  |
Series A Preferred Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Preferred Stock, issued (in shares) | shares |  | 10,000 | 10,000 |  |  |
Liquidation value per share (in dollars per share) | $ / shares |  | $ 2,500 | $ 2,500 |  |  |
Entity listing, depository receipt ratio | 0.01 |  |  |  |  |
Preferred Class B |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Entity listing, depository receipt ratio | 0.01 |  |  |  |  |
Preferred Class B | Level One |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Entity listing, depository receipt ratio |  |  |  |  |  | 0.01
Level One |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired interest | 100.00% |  |  |  |  |
Number of banking centers | banking_center | 17 |  |  |  |  |
Exchange ratio | 0.7167 |  |  |  |  |
Cash payment per share (in dollars per share) | $ / shares | $ 10.17 |  |  |  |  |
Cash paid in acquisition | $ 79,300 |  |  |  |  |
Other intangibles | $ 18,642 |  |  |  |  |
Operating revenue |  |  |  | 56,900 |  |
Provision expense related to CECL Day 1 adjustments |  |  |  | 16,800 |  |
Acquisition-related expenses, net of tax |  |  |  | $ 16,500 |  |
Level One | Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Issuance of common stock related to acquisitions (in shares) | shares | 5,600,000 |  |  |  |  |
Level One | Series A Preferred Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Preferred Stock, issued (in shares) | shares | 10,000 |  |  |  |  |
Dividend rate, percentage | 7.50% |  |  |  |  |
Liquidation value per share (in dollars per share) | $ / shares | $ 2,500 |  |  |  |  |
Level One | Other Intangible Assets |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Other intangibles | $ 18,600 |  |  |  |  |
Level One | Core deposit intangible acquired |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Other intangibles | $ 17,200 |  |  |  |  |
Estimated life | 10 years |  |  |  |  |
Level One | Noncompete Agreements |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Other intangibles | $ 1,400 |  |  |  |  |
Estimated life | 2 years |  |  |  |  |
Sale |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Demand and savings deposits |  | $ (267,400) |  |  |  |
Sale | Old Second National Bank Branch |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of branches sold | bankBranch |  | 5 |  |  | 5 |

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