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Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class, Duration Related Disclosures) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Average Recorded Investment $ 21,600 $ 23,780 $ 34,077
Impaired loans with no related allowance, Interest Income Recognized 893 961 1,332
Impaired loans with related allowance, Average Recorded Investment 1,464 0 0
Impaired loans with related allowance, Interest Income Recognized 91 0 0
Impaired loans, Average Recorded Investment 23,064 23,780 34,077
Impaired loans, Interest Income Recognized 984 961 1,332
One- to Four-Family Segment [Member] | Originated [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Average Recorded Investment 13,918 16,030 23,847
Impaired loans with no related allowance, Interest Income Recognized 606 671 990
Impaired loans with related allowance, Average Recorded Investment 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0
Impaired loans, Average Recorded Investment 13,918 16,030 23,847
Impaired loans, Interest Income Recognized 606 671 990
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Average Recorded Investment 1,878 2,071 3,204
Impaired loans with no related allowance, Interest Income Recognized 73 82 112
Impaired loans with related allowance, Average Recorded Investment 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0
Impaired loans, Average Recorded Investment 1,878 2,071 3,204
Impaired loans, Interest Income Recognized 73 82 112
One- to Four-Family Segment [Member] | Bulk Purchased [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Average Recorded Investment 4,720 5,257 6,438
Impaired loans with no related allowance, Interest Income Recognized 179 180 191
Impaired loans with related allowance, Average Recorded Investment 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0
Impaired loans, Average Recorded Investment 4,720 5,257 6,438
Impaired loans, Interest Income Recognized 179 180 191
Commercial Segment [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Average Recorded Investment 725 0 0
Impaired loans with no related allowance, Interest Income Recognized 15 0 0
Impaired loans with related allowance, Average Recorded Investment 51 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0
Impaired loans, Average Recorded Investment 776 0 0
Impaired loans, Interest Income Recognized 15 0 0
Commercial Segment [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Average Recorded Investment 41 5 0
Impaired loans with no related allowance, Interest Income Recognized 0 0 0
Impaired loans with related allowance, Average Recorded Investment 1,413 0 0
Impaired loans with related allowance, Interest Income Recognized 91 0 0
Impaired loans, Average Recorded Investment 1,454 5 0
Impaired loans, Interest Income Recognized 91 0 0
Consumer Segment [Member] | Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Average Recorded Investment 318 417 588
Impaired loans with no related allowance, Interest Income Recognized 20 28 39
Impaired loans with related allowance, Average Recorded Investment 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0
Impaired loans, Average Recorded Investment 318 417 588
Impaired loans, Interest Income Recognized 20 28 39
Consumer Segment [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Average Recorded Investment 0 0 0
Impaired loans with no related allowance, Interest Income Recognized 0 0 0
Impaired loans with related allowance, Average Recorded Investment 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0
Impaired loans, Average Recorded Investment 0 0 0
Impaired loans, Interest Income Recognized $ 0 $ 0 $ 0