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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 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Financing Receivable, Impaired [Line Items]        
Impaired loans with no related allowance, Average Recorded Investment $ 22,139 $ 23,771 $ 21,971 $ 25,145
Impaired loans with no related allowance, Interest Income Recognized 239 240 476 499
Impaired loans with related allowance, Average Recorded Investment 2,244 0 1,282 0
Impaired loans with related allowance, Interest Income Recognized 42 0 54 0
Impaired loans, Average Recorded Investment 24,383 23,771 23,253 25,145
Impaired loans, Interest Income Recognized 281 240 530 499
One- to Four-Family Segment [Member] | Originated [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired loans with no related allowance, Average Recorded Investment 14,441 15,928 14,526 16,980
Impaired loans with no related allowance, Interest Income Recognized 161 167 322 352
Impaired loans with related allowance, Average Recorded Investment 0 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0 0
Impaired loans, Average Recorded Investment 14,441 15,928 14,526 16,980
Impaired loans, Interest Income Recognized 161 167 322 352
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired loans with no related allowance, Average Recorded Investment 1,854 2,177 1,814 2,251
Impaired loans with no related allowance, Interest Income Recognized 19 23 37 45
Impaired loans with related allowance, Average Recorded Investment 0 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0 0
Impaired loans, Average Recorded Investment 1,854 2,177 1,814 2,251
Impaired loans, Interest Income Recognized 19 23 37 45
One- to Four-Family Segment [Member] | Bulk Purchased [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired loans with no related allowance, Average Recorded Investment 4,965 5,230 4,965 5,453
Impaired loans with no related allowance, Interest Income Recognized 50 43 102 86
Impaired loans with related allowance, Average Recorded Investment 0 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0 0
Impaired loans, Average Recorded Investment 4,965 5,230 4,965 5,453
Impaired loans, Interest Income Recognized 50 43 102 86
Commercial Segment [Member] | Commercial Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired loans with no related allowance, Average Recorded Investment 547 0 312 0
Impaired loans with no related allowance, Interest Income Recognized 4 0 4 0
Impaired loans with related allowance, Average Recorded Investment 0 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0 0
Impaired loans, Average Recorded Investment 547 0 312 0
Impaired loans, Interest Income Recognized 4 0 4 0
Commercial Segment [Member] | Commercial and Industrial [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired loans with no related allowance, Average Recorded Investment 0 0 19 0
Impaired loans with no related allowance, Interest Income Recognized 0 0 0 0
Impaired loans with related allowance, Average Recorded Investment 2,244 0 1,282 0
Impaired loans with related allowance, Interest Income Recognized 42 0 54 0
Impaired loans, Average Recorded Investment 2,244 0 1,301 0
Impaired loans, Interest Income Recognized 42 0 54 0
Consumer Segment [Member] | Home Equity [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired loans with no related allowance, Average Recorded Investment 332 436 335 461
Impaired loans with no related allowance, Interest Income Recognized 5 7 11 16
Impaired loans with related allowance, Average Recorded Investment 0 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0 0
Impaired loans, Average Recorded Investment 332 436 335 461
Impaired loans, Interest Income Recognized 5 7 11 16
Consumer Segment [Member] | Other [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired loans with no related allowance, Average Recorded Investment 0 0 0 0
Impaired loans with no related allowance, Interest Income Recognized 0 0 0 0
Impaired loans with related allowance, Average Recorded Investment 0 0 0 0
Impaired loans with related allowance, Interest Income Recognized 0 0 0 0
Impaired loans, Average Recorded Investment 0 0 0 0
Impaired loans, Interest Income Recognized $ 0 $ 0 $ 0 $ 0