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FAIR VALUE MEASUREMENTS - Schedule of Non-Recurring Basis Assets (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Mortgage Servicing Rights |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | $ 85.5 | $ 84.8 | $ 86.3 | $ 78.0 | $ 75.2 | $ 71.8
Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 0.0 |  | 0.0 |  |  |
Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 0.0 |  | 0.0 |  |  |
Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 87.0 |  | 88.0 |  |  |
Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Collateral dependent loans | 98.0 |  | 105.0 |  |  |
Other real estate owned |  |  | 2.0 |  |  |
Fair Value, Nonrecurring | Mortgage Servicing Rights |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 1.0 |  | 1.0 |  |  |
Fair Value, Nonrecurring | SBA-Guaranteed Loan Servicing |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 1.0 |  | 1.0 |  |  |
Fair Value, Nonrecurring | Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Collateral dependent loans | 0.0 |  | 0.0 |  |  |
Other real estate owned |  |  | 0.0 |  |  |
Fair Value, Nonrecurring | Level 1 | Mortgage Servicing Rights |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 0.0 |  | 0.0 |  |  |
Fair Value, Nonrecurring | Level 1 | SBA-Guaranteed Loan Servicing |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 0.0 |  | 0.0 |  |  |
Fair Value, Nonrecurring | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Collateral dependent loans | 0.0 |  | 0.0 |  |  |
Other real estate owned |  |  | 0.0 |  |  |
Fair Value, Nonrecurring | Level 2 | Mortgage Servicing Rights |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 0.0 |  | 0.0 |  |  |
Fair Value, Nonrecurring | Level 2 | SBA-Guaranteed Loan Servicing |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 0.0 |  | 0.0 |  |  |
Fair Value, Nonrecurring | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Collateral dependent loans | 98.0 |  | 105.0 |  |  |
Other real estate owned |  |  | 2.0 |  |  |
Fair Value, Nonrecurring | Level 3 | Mortgage Servicing Rights |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 1.0 |  | 1.0 |  |  |
Fair Value, Nonrecurring | Level 3 | SBA-Guaranteed Loan Servicing |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | $ 1.0 |  | $ 1.0 |  |  |

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