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TIME CERTIFICATES OF DEPOSIT (Details) - USD ($)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
IRA deposit accounts permanently insured by DIF under management of FDIC $ 250,000  
Time certificates of deposits in denominations of $250,000 or more 231,000,000.0 $ 51,400,000
Time Deposits, Fiscal Year Maturity [Abstract]    
2021 247,971,000  
2022 25,663,000  
2023 538,000  
2024 0  
2025 0  
Total 274,172,000  
Wholesale deposits 348,416,000 $ 1,557,268,000
Non-IRA deposits accounts permanently insured under Dodd-Frank act by DIF under management of FDIC 250,000  
Wholesale Deposits    
Time Deposits, Fiscal Year Maturity [Abstract]    
Wholesale deposits $ 253,900,000