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Employee Stock Ownership and 401(k) Plan (Tables)
12 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Shares Held by the ESOP
Shares held by the ESOP as of September 30, 2020, 2019 and 2018 were classified as follows:
 202020192018
Unallocated shares— — 17,639 
Shares released for allocation415,698 425,281 451,644 
Total ESOP shares415,698 425,281 469,283