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Loans Receivable And Allowance For Credit Losses (Summary Of Loans Receivable) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Loans Receivable [Line Items]    
Loans receivable, gross $ 7,407,442 $ 7,412,473
ACL 31,215 9,226
Discounts/unearned loan fees 30,312 31,058
Premiums/deferred costs (42,175) (44,558)
Loans receivable, net 7,388,090 7,416,747
One- to Four-Family Segment [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 6,477,946 6,512,833
One- to Four-Family Segment [Member] | Originated [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 3,955,668 3,873,851
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 2,268,031 2,349,877
One- to Four-Family Segment [Member] | Bulk Purchased [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 217,652 252,347
One- to Four-Family Segment [Member] | Construction [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 36,595 36,758
Commercial Segment [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 812,289 767,870
Commercial Segment [Member] | Construction [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 87,448 123,159
Commercial Segment [Member] | Commercial Real Estate [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 625,106 583,617
Commercial Segment [Member] | Commercial and Industrial [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 99,735 61,094
Consumer Segment [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 117,207 131,770
Consumer Segment [Member] | Home Equity [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross 107,174 120,587
Consumer Segment [Member] | Other [Member]    
Loans Receivable [Line Items]    
Loans receivable, gross $ 10,033 $ 11,183