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Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class, Instant Related Disclosures) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 21,955 $ 21,794
Impaired loans with no related allowance, Unpaid Principal Balance 23,864 23,445
Impaired loans with related allowance, Recorded Investment 1,771 0
Impaired loans with related allowance, Unpaid Principal Balance 1,770 0
Impaired loans, Recorded Investment 23,726 21,794
Impaired loans, Unpaid Principal Balance 25,634 23,445
Impaired loans, Related ACL 240 0
One- to Four-Family Segment [Member] | Originated [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 13,306 14,683
Impaired loans with no related allowance, Unpaid Principal Balance 13,781 15,241
Impaired loans with related allowance, Recorded Investment 0 0
Impaired loans with related allowance, Unpaid Principal Balance 0 0
Impaired loans, Recorded Investment 13,306 14,683
Impaired loans, Unpaid Principal Balance 13,781 15,241
Impaired loans, Related ACL 0 0
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 1,951 1,763
Impaired loans with no related allowance, Unpaid Principal Balance 2,054 1,868
Impaired loans with related allowance, Recorded Investment 0 0
Impaired loans with related allowance, Unpaid Principal Balance 0 0
Impaired loans, Recorded Investment 1,951 1,763
Impaired loans, Unpaid Principal Balance 2,054 1,868
Impaired loans, Related ACL 0 0
One- to Four-Family Segment [Member] | Bulk Purchased [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 4,573 4,943
Impaired loans with no related allowance, Unpaid Principal Balance 5,293 5,661
Impaired loans with related allowance, Recorded Investment 0 0
Impaired loans with related allowance, Unpaid Principal Balance 0 0
Impaired loans, Recorded Investment 4,573 4,943
Impaired loans, Unpaid Principal Balance 5,293 5,661
Impaired loans, Related ACL 0 0
Commercial Segment [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 1,733 0
Impaired loans with no related allowance, Unpaid Principal Balance 2,060 0
Impaired loans with related allowance, Recorded Investment 0 0
Impaired loans with related allowance, Unpaid Principal Balance 0 0
Impaired loans, Recorded Investment 1,733 0
Impaired loans, Unpaid Principal Balance 2,060 0
Impaired loans, Related ACL 0 0
Commercial Segment [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 103 60
Impaired loans with no related allowance, Unpaid Principal Balance 248 184
Impaired loans with related allowance, Recorded Investment 1,771 0
Impaired loans with related allowance, Unpaid Principal Balance 1,770 0
Impaired loans, Recorded Investment 1,874 60
Impaired loans, Unpaid Principal Balance 2,018 184
Impaired loans, Related ACL 240 0
Consumer Segment [Member] | Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 289 345
Impaired loans with no related allowance, Unpaid Principal Balance 393 462
Impaired loans with related allowance, Recorded Investment 0 0
Impaired loans with related allowance, Unpaid Principal Balance 0 0
Impaired loans, Recorded Investment 289 345
Impaired loans, Unpaid Principal Balance 393 462
Impaired loans, Related ACL 0 0
Consumer Segment [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 0 0
Impaired loans with no related allowance, Unpaid Principal Balance 35 29
Impaired loans with related allowance, Recorded Investment 0 0
Impaired loans with related allowance, Unpaid Principal Balance 0 0
Impaired loans, Recorded Investment 0 0
Impaired loans, Unpaid Principal Balance 35 29
Impaired loans, Related ACL $ 0 $ 0