Securities (Schedule Of Amortized Cost And Estimated Fair Value Of Securities Pledged As Collateral) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Amortized Cost [Member]
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]
Securities pledged as collateral	$ 687,607	$ 659,925
Estimated Fair Value [Member]
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]
Securities pledged as collateral	706,695	674,987
Repurchase Agreements [Member] | Amortized Cost [Member]
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]
Securities pledged as collateral	347,536	353,648
Repurchase Agreements [Member] | Estimated Fair Value [Member]
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]
Securities pledged as collateral	361,377	364,593
Public Unit Deposits [Member] | Amortized Cost [Member]
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]
Securities pledged as collateral	312,142	272,016
Public Unit Deposits [Member] | Estimated Fair Value [Member]
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]
Securities pledged as collateral	316,412	274,917
Federal Reserve Bank [Member] | Amortized Cost [Member]
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]
Securities pledged as collateral	27,929	34,261
Federal Reserve Bank [Member] | Estimated Fair Value [Member]
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]
Securities pledged as collateral	$ 28,906	$ 35,477