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OTHER BORROWINGS - Narrative (Details) - USD ($) | Sep. 30, 2025 | Sep. 01, 2025
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Subordinated Borrowing [Line Items] |  |
Federal home loan bank, advances, general debt obligations, amount of available, unused funds | $ 3,370,000,000 |
Credit arrangements for federal funds purchase | 92,000,000.0 |
Pledged assets separately reported, loans pledged for federal reserve bank, at fair value | 2,610,000,000 |
Loans pledged at federal reserve discount window available for borrowing | $ 2,100,000,000 |
Subordinated Debt |  |
Subordinated Borrowing [Line Items] |  |
Debt instrument, interest rate, stated percentage | 3.875% | 5.875%
Debt instrument, face amount | $ 110,000,000 | $ 74,000,000
Debt instrument, interest rate, effective percentage |  | 8.22%

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