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INTEREST RATE DERIVATIVES - Interest Rate Swap Agreements (Details) - Interest Rate Swap - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2024
Sep. 30, 2023
Dec. 29, 2023
Feb. 14, 2023
Dec. 09, 2022
Derivative [Line Items]          
Notional Amount     $ 2,500 $ 5,000 $ 6,000
FHLB Borrowings and Bank Deposits | Designated as hedging Instrument | Fair Value Hedge          
Derivative [Line Items]          
Notional Amount $ 3,000 $ 5,500      
Weighted Average Rate Contract Pay Rate 1.56% 2.04%      
Weighted Average Rate Received Rate 5.60% 5.35%      
Estimated Fair Value (Liability) Asset $ 68 $ 250