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EMPLOYEE BENEFIT PLANS - ESOP shares (Details) - shares
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Retirement Benefits [Abstract]      
Allocated shares 3,938,384 3,311,660  
Unallocated shares 1,024,642 1,863,181 2,058,000
Employee stock ownership plan (ESOP), shares in ESOP 4,963,026 5,174,841