Securities (Schedule Of Carrying Value Of Securities Pledged As Collateral) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Marketable Securities [Line Items]
AFS Securities	$ 1,444,867	$ 1,563,307
Asset Pledged as Collateral [Member]
Marketable Securities [Line Items]
AFS Securities	898,539	744,692
Asset Pledged as Collateral [Member] | FRB of Kansas City borrowings [Member]
Marketable Securities [Line Items]
AFS Securities	693,853	46,283
Asset Pledged as Collateral [Member] | Public unit deposits [Member]
Marketable Securities [Line Items]
AFS Securities	204,686	125,496
Asset Pledged as Collateral [Member] | FHLB advances [Member]
Marketable Securities [Line Items]
AFS Securities	$ 0	$ 572,913