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Loans Receivable And Allowance For Credit Losses (Summary Of Loans Receivable) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Loans Receivable [Line Items]            
Loans receivable, gross $ 7,951,278   $ 7,984,381      
ACL 25,854 $ 24,634 23,759 $ 22,399 $ 19,889 $ 16,371
Deferred loan fees/discounts 30,777   31,335      
Premiums/deferred costs (38,396)   (41,662)      
Loans receivable, net 7,933,043   7,970,949      
One- to Four-Family Segment [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 6,377,522   6,591,915      
ACL 4,806 5,060 5,328 5,475 5,434 5,006
One- to Four-Family Segment [Member] | Originated [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 3,961,407   3,978,837      
ACL 2,010 2,072 2,149 2,155 2,139 2,066
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 2,262,371   2,405,911      
ACL 2,630 2,793 2,972 3,081 3,074 2,734
One- to Four-Family Segment [Member] | Bulk Purchased [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 129,102   137,193      
ACL 166 195 207 239 221 206
One- to Four-Family Segment [Member] | Construction [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 24,642   69,974      
Commercial Segment [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 1,465,383   1,287,487      
ACL 20,796 19,330 18,180 16,685 14,222 11,120
Commercial Segment [Member] | Construction [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 214,240   178,746      
Commercial Segment [Member] | Commercial Real Estate [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 1,119,295   995,788      
Commercial Segment [Member] | Commercial and Industrial [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 131,848   112,953      
Consumer Segment [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 108,373   104,979      
ACL 252 $ 244 251 $ 239 $ 233 $ 245
Consumer Segment [Member] | Home Equity [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross 98,736   95,723      
Consumer Segment [Member] | Other [Member]            
Loans Receivable [Line Items]            
Loans receivable, gross $ 9,637   $ 9,256