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OTHER BORROWINGS - Narrative (Details) - USD ($)	Sep. 30, 2025	Sep. 01, 2025
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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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