v3.25.4
Loans And Allowance For Credit Losses (Schedule Of Recorded Investment In Loan Receivables That Are Past Due) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Sep. 30, 2025
Financing Receivable, Past Due [Line Items]    
Total $ 15,816,672 $ 15,737,556
30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 14,996 12,548
60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 4,586 4,842
Equal to Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 17,322 17,261
Past Due    
Financing Receivable, Past Due [Line Items]    
Total 36,904 34,651
Current    
Financing Receivable, Past Due [Line Items]    
Total 15,779,768 15,702,905
Other Loans    
Financing Receivable, Past Due [Line Items]    
Total 8,515 8,153
Other Loans | 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 0 0
Other Loans | 60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 0 0
Other Loans | Equal to Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 0 0
Other Loans | Past Due    
Financing Receivable, Past Due [Line Items]    
Total 0 0
Other Loans | Current    
Financing Receivable, Past Due [Line Items]    
Total 8,515 8,153
Real Estate Loans    
Financing Receivable, Past Due [Line Items]    
Total 15,808,157 15,729,403
Real Estate Loans | 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 14,996 12,548
Real Estate Loans | 60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 4,586 4,842
Real Estate Loans | Equal to Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 17,322 17,261
Real Estate Loans | Past Due    
Financing Receivable, Past Due [Line Items]    
Total 36,904 34,651
Real Estate Loans | Current    
Financing Receivable, Past Due [Line Items]    
Total 15,771,253 15,694,752
Real Estate Loans | Residential Core    
Financing Receivable, Past Due [Line Items]    
Total 10,676,463 10,830,505
Real Estate Loans | Residential Core | 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 7,841 6,494
Real Estate Loans | Residential Core | 60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 2,339 2,855
Real Estate Loans | Residential Core | Equal to Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 10,461 10,470
Real Estate Loans | Residential Core | Past Due    
Financing Receivable, Past Due [Line Items]    
Total 20,641 19,819
Real Estate Loans | Residential Core | Current    
Financing Receivable, Past Due [Line Items]    
Total 10,655,822 10,810,686
Real Estate Loans | Residential Home Today    
Financing Receivable, Past Due [Line Items]    
Total 34,323 35,471
Real Estate Loans | Residential Home Today | 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 845 752
Real Estate Loans | Residential Home Today | 60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 354 266
Real Estate Loans | Residential Home Today | Equal to Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 714 560
Real Estate Loans | Residential Home Today | Past Due    
Financing Receivable, Past Due [Line Items]    
Total 1,913 1,578
Real Estate Loans | Residential Home Today | Current    
Financing Receivable, Past Due [Line Items]    
Total 32,410 33,893
Real Estate Loans | Construction    
Financing Receivable, Past Due [Line Items]    
Total 4,747 7,272
Real Estate Loans | Construction | 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 0 0
Real Estate Loans | Construction | 60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 0 0
Real Estate Loans | Construction | Equal to Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 0 0
Real Estate Loans | Construction | Past Due    
Financing Receivable, Past Due [Line Items]    
Total 0 0
Real Estate Loans | Construction | Current    
Financing Receivable, Past Due [Line Items]    
Total 4,747 7,272
Real Estate Loans | Home Equity Line of Credit    
Financing Receivable, Past Due [Line Items]    
Total 4,276,940 4,100,665
Real Estate Loans | Home Equity Line of Credit | 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 5,406 4,791
Real Estate Loans | Home Equity Line of Credit | 60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 1,406 1,382
Real Estate Loans | Home Equity Line of Credit | Equal to Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 5,075 5,296
Real Estate Loans | Home Equity Line of Credit | Past Due    
Financing Receivable, Past Due [Line Items]    
Total 11,887 11,469
Real Estate Loans | Home Equity Line of Credit | Current    
Financing Receivable, Past Due [Line Items]    
Total 4,265,053 4,089,196
Real Estate Loans | Home Equity Loan    
Financing Receivable, Past Due [Line Items]    
Total 815,684 755,490
Real Estate Loans | Home Equity Loan | 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 904 511
Real Estate Loans | Home Equity Loan | 60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 487 339
Real Estate Loans | Home Equity Loan | Equal to Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total 1,072 935
Real Estate Loans | Home Equity Loan | Past Due    
Financing Receivable, Past Due [Line Items]    
Total 2,463 1,785
Real Estate Loans | Home Equity Loan | Current    
Financing Receivable, Past Due [Line Items]    
Total $ 813,221 $ 753,705