Securities (Schedule Of Carrying Value Of Securities Pledged As Collateral) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Marketable Securities [Line Items]
AFS Securities	$ 740,462	$ 1,384,482
Asset Pledged as Collateral [Member]
Marketable Securities [Line Items]
AFS Securities	272,622	697,591
Asset Pledged as Collateral [Member] | FRB of Kansas City borrowings [Member]
Marketable Securities [Line Items]
AFS Securities	124,292	519,195
Asset Pledged as Collateral [Member] | Public unit deposits [Member]
Marketable Securities [Line Items]
AFS Securities	$ 148,330	$ 178,396