Securities (Schedule Of Carrying Value Of Securities Pledged As Collateral) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Marketable Securities [Line Items]
AFS securities	$ 1,563,307	$ 2,014,608
Asset Pledged as Collateral [Member]
Marketable Securities [Line Items]
AFS securities	744,692	395,848
Asset Pledged as Collateral [Member] | FHLB advances [Member]
Marketable Securities [Line Items]
AFS securities	572,913	0
Asset Pledged as Collateral [Member] | Public Unit Deposits [Member]
Marketable Securities [Line Items]
AFS securities	125,496	264,885
Asset Pledged as Collateral [Member] | FRB of Kansas City borrowings [Member]
Marketable Securities [Line Items]
AFS securities	46,283	64,707
Asset Pledged as Collateral [Member] | Commercial Deposits [Member]
Marketable Securities [Line Items]
AFS securities	$ 0	$ 66,256