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Securities (Schedule Of Carrying Value Of Securities Pledged As Collateral) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Marketable Securities [Abstract]    
Public unit deposits $ 340,751 $ 381,143
Federal Reserve Bank of Kansas City ("FRB of Kansas City") 315,149 6,636
Repurchase agreements 106,625 108,271
Total securities pledged as collateral $ 762,525 $ 496,050