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Loans Receivable And Allowance For Credit Losses (Impaired Loans) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Sep. 30, 2020
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment     $ 19,614
Impaired loans with no related allowance, Unpaid Principal Balance     21,201
Impaired loans with related allowance, Recorded Investment     1,929
Impaired loans with related allowance, Unpaid Principal Balance     1,928
Impaired loans, Recorded Investment     21,543
Impaired loans, Unpaid Principal Balance     23,129
Impaired loans, Related ACL     323
Impaired loans with no related allowance, Average Recorded Investment $ 22,139 $ 21,971  
Impaired loans with no related allowance, Interest Income Recognized 239 476  
Impaired loans with related allowance, Average Recorded Investment 2,244 1,282  
Impaired loans with related allowance, Interest Income Recognized 42 54  
Impaired loans, Average Recorded Investment 24,383 23,253  
Impaired loans, Interest Income Recognized 281 530  
One- to Four-Family Segment [Member] | Originated [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment     12,385
Impaired loans with no related allowance, Unpaid Principal Balance     12,813
Impaired loans with related allowance, Recorded Investment     0
Impaired loans with related allowance, Unpaid Principal Balance     0
Impaired loans, Recorded Investment     12,385
Impaired loans, Unpaid Principal Balance     12,813
Impaired loans, Related ACL     0
Impaired loans with no related allowance, Average Recorded Investment 14,441 14,526  
Impaired loans with no related allowance, Interest Income Recognized 161 322  
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 14,441 14,526  
Impaired loans, Interest Income Recognized 161 322  
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment     1,955
Impaired loans with no related allowance, Unpaid Principal Balance     2,058
Impaired loans with related allowance, Recorded Investment     0
Impaired loans with related allowance, Unpaid Principal Balance     0
Impaired loans, Recorded Investment     1,955
Impaired loans, Unpaid Principal Balance     2,058
Impaired loans, Related ACL     0
Impaired loans with no related allowance, Average Recorded Investment 1,854 1,814  
Impaired loans with no related allowance, Interest Income Recognized 19 37  
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 1,854 1,814  
Impaired loans, Interest Income Recognized 19 37  
One- to Four-Family Segment [Member] | Bulk Purchased [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment     3,843
Impaired loans with no related allowance, Unpaid Principal Balance     4,302
Impaired loans with related allowance, Recorded Investment     0
Impaired loans with related allowance, Unpaid Principal Balance     0
Impaired loans, Recorded Investment     3,843
Impaired loans, Unpaid Principal Balance     4,302
Impaired loans, Related ACL     0
Impaired loans with no related allowance, Average Recorded Investment 4,965 4,965  
Impaired loans with no related allowance, Interest Income Recognized 50 102  
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 4,965 4,965  
Impaired loans, Interest Income Recognized 50 102  
Commercial Segment [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment     1,052
Impaired loans with no related allowance, Unpaid Principal Balance     1,379
Impaired loans with related allowance, Recorded Investment     660
Impaired loans with related allowance, Unpaid Principal Balance     660
Impaired loans, Recorded Investment     1,712
Impaired loans, Unpaid Principal Balance     2,039
Impaired loans, Related ACL     83
Impaired loans with no related allowance, Average Recorded Investment 547 312  
Impaired loans with no related allowance, Interest Income Recognized 4 4  
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 547 312  
Impaired loans, Interest Income Recognized 4 4  
Commercial Segment [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment     99
Impaired loans with no related allowance, Unpaid Principal Balance     244
Impaired loans with related allowance, Recorded Investment     1,269
Impaired loans with related allowance, Unpaid Principal Balance     1,268
Impaired loans, Recorded Investment     1,368
Impaired loans, Unpaid Principal Balance     1,512
Impaired loans, Related ACL     240
Impaired loans with no related allowance, Average Recorded Investment 0 19  
Impaired loans with no related allowance, Interest Income Recognized 0 0  
Impaired loans with related allowance, Average Recorded Investment 2,244 1,282  
Impaired loans with related allowance, Interest Income Recognized 42 54  
Impaired loans, Average Recorded Investment 2,244 1,301  
Impaired loans, Interest Income Recognized 42 54  
Consumer Segment [Member] | Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment     280
Impaired loans with no related allowance, Unpaid Principal Balance     360
Impaired loans with related allowance, Recorded Investment     0
Impaired loans with related allowance, Unpaid Principal Balance     0
Impaired loans, Recorded Investment     280
Impaired loans, Unpaid Principal Balance     360
Impaired loans, Related ACL     0
Impaired loans with no related allowance, Average Recorded Investment 332 335  
Impaired loans with no related allowance, Interest Income Recognized 5 11  
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 332 335  
Impaired loans, Interest Income Recognized 5 11  
Consumer Segment [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment     0
Impaired loans with no related allowance, Unpaid Principal Balance     45
Impaired loans with related allowance, Recorded Investment     0
Impaired loans with related allowance, Unpaid Principal Balance     0
Impaired loans, Recorded Investment     0
Impaired loans, Unpaid Principal Balance     45
Impaired loans, Related ACL     $ 0
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