Securities (Schedule Of Amortized Cost And Estimated Fair Value Of Securities Pledged As Collateral) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	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	$ 666,137	$ 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	673,854	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	347,507	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	354,409	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	286,953	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	286,896	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	31,677	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	$ 32,549	$ 35,477