Securities (Schedule Of Carrying Value Of Securities Pledged As Collateral) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Marketable Securities [Line Items]
AFS Securities	$ 956,229	$ 856,266
Asset Pledged as Collateral [Member]
Marketable Securities [Line Items]
AFS Securities	250,109	220,029
Asset Pledged as Collateral [Member] | FRB of Kansas City borrowings [Member]
Marketable Securities [Line Items]
AFS Securities	95,307	111,281
Asset Pledged as Collateral [Member] | Public unit deposits [Member]
Marketable Securities [Line Items]
AFS Securities	$ 154,802	$ 108,748