OTHER BORROWINGS, Schedule of Other Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2025	Sep. 30, 2025
Other Borrowings [Line Items]
Total FHLB advances	$ 700	$ 700
FHLB Advance Maturing March 2026 - September 2026
Other Borrowings [Line Items]
Weighted-average interest rate	3.98%
Total FHLB advances	$ 450
FHLB Advance Maturing December 2027 - December 2028
Other Borrowings [Line Items]
Weighted-average interest rate	3.99%
Total FHLB advances	$ 250
FHLB Advance Maturing December 2025 - December 2026
Other Borrowings [Line Items]
Weighted-average interest rate		4.44%
Total FHLB advances		$ 500
FHLB Advance Maturing December 2028
Other Borrowings [Line Items]
Weighted-average interest rate		4.10%
Total FHLB advances		$ 200