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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, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, No Related Allowance $ 37,725 $ 22,645
Average Recorded Investment, Allowance Recorded 17,571 32,327
Average Recorded Investment 55,296 54,972
Interest Income Recognized, No Related Allowance 305 172
Interest Income Recognized, Allowance Recorded 166 283
Interest Income Recognized 471 455
One- to Four-Family Segment [Member] | Originated [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, No Related Allowance 22,687 10,843
Average Recorded Investment, Allowance Recorded 13,289 26,779
Average Recorded Investment 35,976 37,622
Interest Income Recognized, No Related Allowance 205 110
Interest Income Recognized, Allowance Recorded 125 252
Interest Income Recognized 330 362
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, No Related Allowance 3,138 129
Average Recorded Investment, Allowance Recorded 2,254 1,335
Average Recorded Investment 5,392 1,464
Interest Income Recognized, No Related Allowance 24 3
Interest Income Recognized, Allowance Recorded 20 13
Interest Income Recognized 44 16
One- to Four-Family Segment [Member] | Bulk Purchased [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, No Related Allowance 10,898 11,090
Average Recorded Investment, Allowance Recorded 1,428 3,246
Average Recorded Investment 12,326 14,336
Interest Income Recognized, No Related Allowance 46 51
Interest Income Recognized, Allowance Recorded 6 7
Interest Income Recognized 52 58
Commercial Real Estate Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, No Related Allowance 0 0
Average Recorded Investment, Allowance Recorded 0 0
Average Recorded Investment 0 0
Interest Income Recognized, No Related Allowance 0 0
Interest Income Recognized, Allowance Recorded 0 0
Interest Income Recognized 0 0
Consumer Segment [Member] | Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, No Related Allowance 991 574
Average Recorded Investment, Allowance Recorded 587 954
Average Recorded Investment 1,578 1,528
Interest Income Recognized, No Related Allowance 30 8
Interest Income Recognized, Allowance Recorded 15 11
Interest Income Recognized 45 19
Consumer Segment [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, No Related Allowance 11 9
Average Recorded Investment, Allowance Recorded 13 13
Average Recorded Investment 24 22
Interest Income Recognized, No Related Allowance 0 0
Interest Income Recognized, Allowance Recorded 0 0
Interest Income Recognized $ 0 $ 0