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Investment Securities (Investment Securities Pledged To Secure Borrowings And Public Deposits) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Investment Securities [Abstract]
To Federal Home Loan Bank to secure borrowings, Amortized Cost	$ 183,909
To Federal Home Loan Bank to secure borrowings, Fair Value	190,176
To state and local governments to secure public deposits, Amortized Cost	738,780
To state and local governments to secure public deposits, Fair Value	759,019
Other securities pledged, Amortized Cost	191,740
Other securities pledged, Fair Value	194,200
Total pledged securities, Amortized Cost	1,114,429
Total pledged securities, Fair Value	$ 1,143,395

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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