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SHORT-TERM DEBT AND LONG-TERM BORROWINGS SHORT-TERM DEBT AND LONG-TERM BORROWINGS - Short Term Debt (Details) - USD ($)
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Short-term Debt [Line Items]    
Short-term borrowings $ 646,019,000 $ 425,759,000
Pledged securities against specific FHLB advances, fair value 812,200,000 1,060,000,000.00
Loans pledged as collateral 928,800,000 756,000,000.0
Securities sold under agreements to repurchase, total 4,000,000.0 3,700,000
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]    
Highest month-end balance 4,306,000 3,740,000
Average balance $ 3,542,000 $ 2,557,000
Weighted average interest rate for the fiscal year 2.67% 2.05%
Weighted average interest rate at fiscal year end 2.41% 2.48%
Securities pledged as collateral for securities sold under agreement to repurchase, fair value $ 4,900,000 $ 13,900,000
Line of credit facility, maximum borrowing capacity 25,000,000.0  
Overnight federal funds purchased    
Short-term Debt [Line Items]    
Short-term borrowings 642,000,000 422,000,000.0
Short-term FHLB advances    
Short-term Debt [Line Items]    
Short-term borrowings 0  
Short-term capital lease    
Short-term Debt [Line Items]    
Short-term borrowings 0 65,000
Repurchase agreements    
Short-term Debt [Line Items]    
Short-term borrowings 4,019,000 $ 3,694,000
FHLB | Overnight federal funds purchased    
Short-term Debt [Line Items]    
Short-term borrowings 477,000,000.0  
Other Financial Institutions | Overnight federal funds purchased    
Short-term Debt [Line Items]    
Short-term borrowings $ 165,000,000.0