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Loans Receivable And Allowance For Credit Losses (Summary Of Loans Receivable) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Loans Receivable [Line Items]          
Loans receivable, gross $ 7,245,751   $ 7,096,073    
ACL 16,283 $ 15,312 19,823 $ 20,724 $ 23,397
Deferred loan fees/discounts 29,470   29,556    
Premiums/deferred costs (36,198)   (34,448)    
Loans receivable, net 7,236,196   7,081,142    
One- to Four-Family Segment [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 6,246,317   6,172,345    
ACL 4,565 4,079 3,978 3,948 3,988
One- to Four-Family Segment [Member] | Originated [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 3,963,608   3,956,064    
ACL 1,904 1,709 1,612 1,535 1,536
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 2,070,822   2,003,477    
ACL 2,437 2,129 2,062 1,739 1,705
One- to Four-Family Segment [Member] | Bulk Purchased [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 151,461   173,662    
ACL 224 241 304 674 747
One- to Four-Family Segment [Member] | Construction [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 60,426   39,142    
Commercial Segment [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 903,910   829,368    
ACL 11,490 11,031 15,652 16,533 19,157
Commercial Segment [Member] | Construction [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 115,031   85,963    
Commercial Segment [Member] | Commercial Real Estate [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 717,947   676,908    
Commercial Segment [Member] | Commercial and Industrial [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 70,932   66,497    
Consumer Segment [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 95,524   94,360    
ACL 228 $ 202 193 $ 243 $ 252
Consumer Segment [Member] | Home Equity [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross 87,235   86,274    
Consumer Segment [Member] | Other [Member]          
Loans Receivable [Line Items]          
Loans receivable, gross $ 8,289   $ 8,086