Securities (Schedule Of Carrying Value Of Securities Pledged As Collateral) (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Marketable Securities [Line Items] | ||
| AFS securities | $ 809,566 | $ 867,216 |
| Asset Pledged as Collateral [Member] | ||
| Marketable Securities [Line Items] | ||
| AFS securities | 202,770 | 242,046 |
| Asset Pledged as Collateral [Member] | FRB of Kansas City borrowings [Member] | ||
| Marketable Securities [Line Items] | ||
| AFS securities | 99,018 | 150,916 |
| Asset Pledged as Collateral [Member] | Public Unit Deposits [Member] | ||
| Marketable Securities [Line Items] | ||
| AFS securities | $ 103,752 | $ 91,130 |