OTHER BORROWINGS, Schedule of Other Borrowings (Details) - USD ($) $ in Millions	Jun. 30, 2025	Sep. 30, 2024
Other Borrowings [Abstract]
Total FHLB advances	$ 750	$ 950
Total other borrowings	$ 849	$ 1,049
FHLB Advance Maturing September 2025 - December 2026
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)	4.68%
Total FHLB advances	$ 550
FHLB Advance Maturing December 2028
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)	4.10%
Total FHLB advances	$ 200
FHLB Advance Maturing March 2025 - December 2025
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)		5.14%
Total FHLB advances		$ 650
FHLB Advance Maturing December 2024 - December 2028
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)		4.47%
Total FHLB advances		$ 300
Subordinated notes due 2030
Other Borrowings [Abstract]
Subordinated notes - fixed-to-floating	99	99
Subordinated Debt
Other Borrowings [Abstract]
Unaccreted premium	$ 1	$ 1
Subordinated Debt \| Subordinated notes due 2030
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)	9.95%	5.75%

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount, after accumulated amortization, of debt premium.

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