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OTHER BORROWINGS, Schedule of Other Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Other Borrowings [Line Items]    
Total FHLB advances $ 700 $ 700
Total other borrowings $ 950 700
Secured and unsecured lines of credit    
Other Borrowings [Line Items]    
Weighted-average interest rate 4.30%  
Secured and unsecured lines of credit $ 250 $ 0
FHLB Advance Maturing December 2026 - September 2027    
Other Borrowings [Line Items]    
Weighted-average interest rate 3.89%  
Total FHLB advances $ 300  
FHLB Advance Maturing December 2027 - December 2028    
Other Borrowings [Line Items]    
Weighted-average interest rate 4.04%  
Total FHLB advances $ 400  
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