v3.25.2
Derivative Instruments (Schedule Of Effect Of Derivative Instruments, Gain (Loss) In Statement Of Financial Performance) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Designated as Hedging Instrument | Cash Flow Hedge | Interest expense: Borrowed funds and Deposits        
Derivatives, Fair Value [Line Items]        
Amount of gain/(loss) reclassified from AOCI $ 10,114 $ 21,369 $ 36,087 $ 67,152
Designated as Hedging Instrument | Cash Flow Hedge | Other Comprehensive Income (Loss)        
Derivatives, Fair Value [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax $ (15,454) $ 21,433 $ 32,090 $ (858)
Not Designated as Hedging Instrument | Interest Rate Lock Commitments        
Derivatives, Fair Value [Line Items]        
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income, Other Operating Income Noninterest Income, Other Operating Income Noninterest Income, Other Operating Income Noninterest Income, Other Operating Income
Total $ 279 $ 154 $ 202 $ 513
Not Designated as Hedging Instrument | Forward Commitments For Sale Of Mortgage Loans        
Derivatives, Fair Value [Line Items]        
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net gain on the sale of loans Net gain on the sale of loans Net gain on the sale of loans Net gain on the sale of loans
Total $ (139) $ 132 $ (88) $ (19)