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Loans Receivable And Allowance For Credit Losses (Summary Of Loans Receivable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Loans Receivable [Line Items]        
Loans receivable, gross $ 7,961,689 $ 7,984,381    
ACL 24,178 23,759 $ 19,189 $ 16,371
Deferred loan fees/discounts 30,653 31,335    
Premiums/deferred costs (40,652) (41,662)    
Loans receivable, net 7,947,510 7,970,949    
One- to Four-Family Segment [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 6,525,457 6,591,915    
ACL 5,248 5,328 5,362 5,006
One- to Four-Family Segment [Member] | Originated [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 3,986,479 3,978,837    
ACL 2,094 2,149 2,159 2,066
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 2,360,843 2,405,911    
ACL 2,948 2,972 2,987 2,734
One- to Four-Family Segment [Member] | Bulk Purchased [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 134,504 137,193    
ACL 206 207 216 206
One- to Four-Family Segment [Member] | Construction [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 43,631 69,974    
Commercial Segment [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 1,329,610 1,287,487    
ACL 18,678 18,180 13,584 11,120
Commercial Segment [Member] | Construction [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 196,493 178,746    
Commercial Segment [Member] | Commercial Real Estate [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 1,019,431 995,788    
Commercial Segment [Member] | Commercial and Industrial [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 113,686 112,953    
Consumer Segment [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 106,622 104,979    
ACL 252 251 $ 243 $ 245
Consumer Segment [Member] | Home Equity [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross 96,952 95,723    
Consumer Segment [Member] | Other [Member]        
Loans Receivable [Line Items]        
Loans receivable, gross $ 9,670 $ 9,256