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OTHER BORROWINGS (Details) - USD ($)		9 Months Ended
OTHER BORROWINGS (Details) - USD ($)	Jul. 03, 2023	Jun. 30, 2023	Apr. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Total FHLB advances		$ 1,000,000,000		$ 1,190,000,000
Subordinated notes - fixed-to-floating		100,000,000		100,000,000
Other		0		1,000,000
Total other borrowings		$ 1,100,000,000		$ 1,291,000,000
Subordinated Debt
Debt Instrument [Line Items]
Weighted average interest rate		5.75%		5.75%
Unaccreted premium		$ 2,000,000		$ 2,000,000
Subordinated Debt \| Subsequent Event
Debt Instrument [Line Items]
Stated interest rate	5.75%
Subordinated Debt \| Secured Overnight Financing Rate (SOFR) \| Subsequent Event
Debt Instrument [Line Items]
Spread on variable interest rate	5.62%
FHLB Advance Maturing December 2023 - March 2025
Debt Instrument [Line Items]
Weighted average interest rate		5.36%
Total FHLB advances		$ 850,000,000
FHLB Advance Maturing December 2023
Debt Instrument [Line Items]
Weighted average interest rate				3.32%
Total FHLB advances				$ 850,000,000
FHLB Advance Maturing Overnight
Debt Instrument [Line Items]
Weighted average interest rate		0.00%		3.11%
Total FHLB advances		$ 0		$ 140,000,000
FHLB Advance Maturing September 2023
Debt Instrument [Line Items]
Weighted average interest rate		5.59%
Total FHLB advances		$ 150,000,000
FHLB Advance Maturing December 2022
Debt Instrument [Line Items]
Weighted average interest rate				3.45%
Total FHLB advances				$ 200,000,000
The Credit Facility \| Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Revolving credit agreement maximum borrowing capacity			$ 750,000,000
Revolving credit agreement, outstanding		$ 0		$ 0
Revolving credit agreement commitment fee percentage		0.125%