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Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class, Instant Related Disclosures) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 21,671 $ 21,794
Impaired loans with no related allowance, Unpaid Principal Balance 23,352 23,445
Impaired loans with related allowance, Recorded Investment 2,432 0
Impaired loans with related allowance, Unpaid Principal Balance 2,432 0
Impaired loans, Recorded Investment 24,103 21,794
Impaired loans, Unpaid Principal Balance 25,784 23,445
Impaired loans, Related ACL 225 0
One- to Four-Family Segment [Member] | Originated [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 14,568 14,683
Impaired loans with no related allowance, Unpaid Principal Balance 15,135 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 14,568 14,683
Impaired loans, Unpaid Principal Balance 15,135 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 1,756 1,763
Impaired loans with no related allowance, Unpaid Principal Balance 1,861 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 1,756 1,763
Impaired loans, Unpaid Principal Balance 1,861 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 5,020 4,943
Impaired loans with no related allowance, Unpaid Principal Balance 5,737 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 5,020 4,943
Impaired loans, Unpaid Principal Balance 5,737 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 0 0
Impaired loans with no related allowance, Unpaid Principal Balance 0 0
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 0 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 2,432 0
Impaired loans with related allowance, Unpaid Principal Balance 2,432 0
Impaired loans, Recorded Investment 2,432 60
Impaired loans, Unpaid Principal Balance 2,580 184
Impaired loans, Related ACL 225 0
Consumer Segment [Member] | Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 327 345
Impaired loans with no related allowance, Unpaid Principal Balance 440 462
Impaired loans with related allowance, Recorded Investment 0 0
Impaired loans with related allowance, Unpaid Principal Balance 0 0
Impaired loans, Recorded Investment 327 345
Impaired loans, Unpaid Principal Balance 440 462
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 31 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 31 29
Impaired loans, Related ACL $ 0 $ 0