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SHORT-TERM AND LONG-TERM BORROWINGS - Short Term Debt (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Debt Disclosure [Abstract]    
Pledged securities against specific FHLB advances, fair value $ 644,700,000 $ 673,800,000
Loans pledged as collateral 0 333,800,000
Securities sold under agreements to repurchase, total 0  
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]    
Highest month-end balance 0 2,550,000
Average balance $ 0 $ 328,000
Weighted average interest rate for the fiscal year 0.00% 2.00%
Weighted average interest rate at fiscal year end 0.00% 0.00%
Securities pledged as collateral for securities sold under agreement to repurchase, fair value $ 0