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SHORT-TERM AND LONG-TERM BORROWINGS - Short Term Debt (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024
Short-Term Debt [Abstract]
Short-term borrowings	$ 9,000,000	$ 377,000,000
Total loans and leases, net	4,611,589,000	4,003,430,000
Securities sold under agreements to repurchase, total	0	0
Asset Pledged as Collateral
Short-Term Debt [Abstract]
Total loans and leases, net	223,000,000.0	136,900,000
Estimated Fair Value
Short-Term Debt [Abstract]
Fair value	4,599,269,000	4,036,490,000
Estimated Fair Value | Asset Pledged as Collateral with Right | Federal Home Loan Bank Advances
Short-Term Debt [Abstract]
Fair value	955,300,000	1,040,000,000.00
Overnight fed funds purchased
Short-Term Debt [Abstract]
Short-term borrowings	9,000,000	377,000,000
Overnight fed funds purchased | FHLB
Short-Term Debt [Abstract]
Short-term borrowings	9,000,000	257,000,000.0
Overnight fed funds purchased | Other Financial Institutions
Short-Term Debt [Abstract]
Short-term borrowings	$ 0	$ 120,000,000

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