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SHORT-TERM AND LONG-TERM BORROWINGS - Short Term Debt (Details) - USD ($)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Short-term Debt [Line Items]    
Short-term borrowings $ 0 $ 646,019,000
Pledged securities against specific FHLB advances, fair value 673,800,000 812,200,000
Loans pledged as collateral 333,800,000 928,800,000
Securities sold under agreements to repurchase, total 0 4,000,000.0
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]    
Highest month-end balance 2,550,000 4,306,000
Average balance $ 328,000 $ 3,542,000
Weighted average interest rate for the fiscal year 2.00% 2.67%
Weighted average interest rate at fiscal year end 0.00% 2.41%
Securities pledged as collateral for securities sold under agreement to repurchase, fair value $ 0 $ 4,900,000
Line of credit facility, maximum borrowing capacity 25,000,000.0  
Overnight federal funds purchased    
Short-term Debt [Line Items]    
Short-term borrowings 0 642,000,000
Repurchase agreements    
Short-term Debt [Line Items]    
Short-term borrowings 0 4,019,000
Federal home loan bank advances    
Short-term Debt [Line Items]    
Short-term borrowings 0 0
FHLB | Overnight federal funds purchased    
Short-term Debt [Line Items]    
Short-term borrowings $ 0 477,000,000.0
Other Financial Institutions | Overnight federal funds purchased    
Short-term Debt [Line Items]    
Short-term borrowings   $ 165,000,000.0