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Borrowed Funds (Schedule of Federal Home Loan Bank Advances (FHLB) Borrowings) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Debt Disclosure [Abstract]    
12 months or less $ 1,198,115  
13 to 24 months 1,025,000  
25 to 36 months 851,040  
37 to 48 months 776,739  
49 to 60 months 1,000,000  
over 60 months 1,644  
Line of Credit Facility, Increase, Accrued Interest 17,681  
Total $ 4,870,219 $ 4,792,847
Weighted Average Rate 12 months or less 3.32%  
Weighted Average Rate 13 to 24 months 3.27%  
Weighted Average Rate 25 to 36 months 3.84%  
Weighted Average Rate 37 to 48 months 3.48%  
Weighted Average Rate 49 to 60 months 3.47%  
Weighted Average Rate Over 60 months 1.39%  
Weighted Average Rate Total FHLB Advances 3.46%  
Line of Credit Facility, Current Borrowing Capacity $ 4,852,538