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OTHER BORROWINGS - Narrative (Details) - USD ($) $ in Millions | Oct. 01, 2025 | Jun. 01, 2025 | Dec. 15, 2024 | Mar. 15, 2022 | Jul. 01, 2019 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 28, 2020 | Dec. 06, 2019
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Federal home loan bank, advances, general debt obligations, amount of available, unused funds |  |  |  |  |  | $ 3,680.0 |  |  |
Credit arrangements for federal funds purchase |  |  |  |  |  | 92.0 |  |  |
Pledged assets separately reported, loans pledged for federal reserve bank, at fair value |  |  |  |  |  | 2,890.0 |  |  |
Loans pledged at federal reserve discount window available for borrowing |  |  |  |  |  | 2,280.0 |  |  |
Senior Subordinated Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Redemption price (as a percent) |  |  |  | 100.00% |  |  |  |  |
Subordinated notes payable due December 15, 2029 net of unamortized debt issuance cost of $0 and $1,296, respectively; fixed interest rate of 4.25% through December 14, 2024; variable interest rate thereafter at three-month SOFR plus 2.94% (2029 subordinated notes) | Senior Subordinated Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  | 2.3 | $ 12.0 | $ 110.0 | $ 120.0
Interest rate, stated (as a percent) |  |  |  |  |  |  |  | 3.875% | 4.25%
Basis spread on variable rate (as a percent) |  |  | 2.94% |  |  |  |  |  |
Redemption price (as a percent) |  |  | 100.00% |  |  |  |  |  |
Subordinated notes payable due December 15, 2029 net of unamortized debt issuance cost of $0 and $1,296, respectively; fixed interest rate of 4.25% through December 14, 2024; variable interest rate thereafter at three-month SOFR plus 2.94% (2029 subordinated notes) | Scenario, Forecast | Senior Subordinated Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 3.753% |  |  |  |  |  |  |  |
Redemption price (as a percent) | 100.00% |  |  |  |  |  |  |  |
Subordinated notes payable due May 31, 2030 net of unaccreted purchase accounting fair value adjustment of $653 and $784, respectively; fixed interest rate of 5.875% through May 31, 2025; variable interest rate thereafter at three-month SOFR plus 3.63% (Bank subordinated notes) (1) | Senior Subordinated Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 75.0 | $ 1.0 |  |  |
Interest rate, stated (as a percent) |  |  |  |  | 5.875% |  |  |  |
Unaccreted purchase accounting fair value adjustment |  |  |  |  | $ 1.3 |  |  |  |
Subordinated notes payable due May 31, 2030 net of unaccreted purchase accounting fair value adjustment of $653 and $784, respectively; fixed interest rate of 5.875% through May 31, 2025; variable interest rate thereafter at three-month SOFR plus 3.63% (Bank subordinated notes) (1) | Scenario, Forecast | Senior Subordinated Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 3.63% |  |  |  |  |  |  |
Redemption price (as a percent) |  | 100.00% |  |  |  |  |  |  |

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