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SHORT-TERM AND LONG-TERM BORROWINGS - Short Term Debt (Details) - USD ($)
Sep. 30, 2023
Sep. 30, 2022
Short-Term Debt [Abstract]    
Short-term borrowings $ 13,000,000 $ 0
Loans 4,316,411,000 3,490,358,000
Securities sold under agreements to repurchase, total 0 0
Overnight fed funds purchased    
Short-Term Debt [Abstract]    
Short-term borrowings 13,000,000 0
Estimated Fair Value    
Short-Term Debt [Abstract]    
Loans and leases 4,223,010,000 3,525,803,000
Asset Pledged as Collateral with Right | Estimated Fair Value | Federal Home Loan Bank Advances [Member]    
Short-Term Debt [Abstract]    
Loans and leases 996,900,000 804,000,000
Asset Pledged as Collateral    
Short-Term Debt [Abstract]    
Loans $ 21,300,000 $ 0