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Securities (Schedule Of Amortized Cost And Estimated Fair Value Of Securities Pledged As Collateral) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Amortized Cost [Member]
Securities pledged as collateral	$ 664,320	$ 670,212
Estimated Fair Value [Member]
Securities pledged as collateral	702,582	712,500
Repurchase Agreements [Member] \| Amortized Cost [Member]
Securities pledged as collateral	400,529	400,827
Repurchase Agreements [Member] \| Estimated Fair Value [Member]
Securities pledged as collateral	426,106	427,864
Public Unit Deposits [Member] \| Amortized Cost [Member]
Securities pledged as collateral	217,839	219,913
Public Unit Deposits [Member] \| Estimated Fair Value [Member]
Securities pledged as collateral	228,423	232,514
Federal Reserve Bank [Member] \| Amortized Cost [Member]
Securities pledged as collateral	45,952	49,472
Federal Reserve Bank [Member] \| Estimated Fair Value [Member]
Securities pledged as collateral	$ 48,053	$ 52,122

Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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