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Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class, Duration Related Disclosures) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment $ 21,729 $ 26,479
Impaired loans with no related allowance, Interest Income Recognized 237 259
Impaired loans with related allowance, Average Recorded Investment 608 0
Impaired loans with related allowance, Interest Income Recognized 12 0
Impaired loans, Average Recorded Investment 22,337 26,479
Impaired loans, Interest Income Recognized 249 259
One- to Four-Family Segment [Member] | Originated [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 14,621 18,049
Impaired loans with no related allowance, Interest Income Recognized 161 185
Impaired loans with related allowance, Average Recorded Investment 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0
Impaired loans, Average Recorded Investment 14,621 18,049
Impaired loans, Interest Income Recognized 161 185
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 1,760 2,309
Impaired loans with no related allowance, Interest Income Recognized 18 22
Impaired loans with related allowance, Average Recorded Investment 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0
Impaired loans, Average Recorded Investment 1,760 2,309
Impaired loans, Interest Income Recognized 18 22
One- to Four-Family Segment [Member] | Bulk Purchased [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 4,978 5,632
Impaired loans with no related allowance, Interest Income Recognized 52 43
Impaired loans with related allowance, Average Recorded Investment 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0
Impaired loans, Average Recorded Investment 4,978 5,632
Impaired loans, Interest Income Recognized 52 43
Commercial Segment [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 0 0
Impaired loans with no related allowance, Interest Income Recognized 0 0
Impaired loans with related allowance, Average Recorded Investment 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0
Impaired loans, Average Recorded Investment 0 0
Impaired loans, Interest Income Recognized 0 0
Commercial Segment [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 33 0
Impaired loans with no related allowance, Interest Income Recognized 0 0
Impaired loans with related allowance, Average Recorded Investment 608 0
Impaired loans with related allowance, Interest Income Recognized 12 0
Impaired loans, Average Recorded Investment 641 0
Impaired loans, Interest Income Recognized 12 0
Consumer Segment [Member] | Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 337 489
Impaired loans with no related allowance, Interest Income Recognized 6 9
Impaired loans with related allowance, Average Recorded Investment 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0
Impaired loans, Average Recorded Investment 337 489
Impaired loans, Interest Income Recognized 6 9
Consumer Segment [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 0 0
Impaired loans with no related allowance, Interest Income Recognized 0 0
Impaired loans with related allowance, Average Recorded Investment 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0
Impaired loans, Average Recorded Investment 0 0
Impaired loans, Interest Income Recognized $ 0 $ 0