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Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class, Instant Related Disclosures) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 22,109 $ 21,794
Impaired loans with no related allowance, Unpaid Principal Balance 24,159 23,445
Impaired loans with related allowance, Recorded Investment 2,076 0
Impaired loans with related allowance, Unpaid Principal Balance 2,074 0
Impaired loans, Recorded Investment 24,185 21,794
Impaired loans, Unpaid Principal Balance 26,233 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 14,406 14,683
Impaired loans with no related allowance, Unpaid Principal Balance 15,013 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 14,406 14,683
Impaired loans, Unpaid Principal Balance 15,013 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 1,946 1,763
Impaired loans with no related allowance, Unpaid Principal Balance 2,049 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 1,946 1,763
Impaired loans, Unpaid Principal Balance 2,049 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 4,909 4,943
Impaired loans with no related allowance, Unpaid Principal Balance 5,630 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 4,909 4,943
Impaired loans, Unpaid Principal Balance 5,630 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 512 0
Impaired loans with no related allowance, Unpaid Principal Balance 840 0
Impaired loans with related allowance, Recorded Investment 0 0
Impaired loans with related allowance, Unpaid Principal Balance 0 0
Impaired loans, Recorded Investment 512 0
Impaired loans, Unpaid Principal Balance 840 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 0 60
Impaired loans with no related allowance, Unpaid Principal Balance 148 184
Impaired loans with related allowance, Recorded Investment 2,076 0
Impaired loans with related allowance, Unpaid Principal Balance 2,074 0
Impaired loans, Recorded Investment 2,076 60
Impaired loans, Unpaid Principal Balance 2,222 184
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 336 345
Impaired loans with no related allowance, Unpaid Principal Balance 446 462
Impaired loans with related allowance, Recorded Investment 0 0
Impaired loans with related allowance, Unpaid Principal Balance 0 0
Impaired loans, Recorded Investment 336 345
Impaired loans, Unpaid Principal Balance 446 462
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 33 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 33 29
Impaired loans, Related ACL $ 0 $ 0