Securities (Schedule Of Amortized Cost And Estimated Fair Value Of Securities Pledged As Collateral) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 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	$ 648,891	$ 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	661,614	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	345,697	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	356,488	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	273,769	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	274,775	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	29,425	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	$ 30,351	$ 35,477