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Employee Stock Ownership and 401(k) Plan: Schedule of Shares held by the ESOP (Details) - shares
shares in Thousands
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Retirement Benefits [Abstract]      
Unallocated shares (shares) 0 0 17,639
Shares released for allocation (shares) 415,698 425,281 451,644
Total ESOP shares (shares) 415,698 425,281 469,283