Securities (Schedule Of Carrying Value Of Securities Pledged As Collateral) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Marketable Securities [Line Items]
AFS Securities	$ 1,528,686	$ 1,563,307
Asset Pledged as Collateral [Member]
Marketable Securities [Line Items]
AFS Securities	754,128	744,692
Asset Pledged as Collateral [Member] | FHLB advances [Member]
Marketable Securities [Line Items]
AFS Securities	572,068	572,913
Asset Pledged as Collateral [Member] | Public unit deposits [Member]
Marketable Securities [Line Items]
AFS Securities	137,562	125,496
Asset Pledged as Collateral [Member] | FRB of Kansas City borrowings [Member]
Marketable Securities [Line Items]
AFS Securities	$ 44,498	$ 46,283