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Investment Securities (Investment Securities Pledged To Secure Borrowings And Public Deposits) (Details) (USD $) In Thousands	Sep. 30, 2011
Investment Securities [Abstract]
To Federal Home Loan Bank to secure borrowings, Amortized Cost	$ 199,008
To Federal Home Loan Bank to secure borrowings, Fair Value	207,574
To state and local governments to secure public deposits, Amortized Cost	560,043
To state and local governments to secure public deposits, Fair Value	583,556
Other securities pledged, Amortized Cost	201,504
Other securities pledged, Fair Value	205,411
Total pledged securities, Amortized Cost	960,555
Total pledged securities, Fair Value	$ 996,541

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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- Definition

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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