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Investment Securities (Investment Securities Pledged To Secure Borrowings And Public Deposits) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Investment Securities [Abstract]
To Federal Home Loan Bank to secure borrowings, Amortized Cost	$ 158,984
To Federal Home Loan Bank to secure borrowings, Fair Value	164,620
To state and local governments to secure public deposits, Amortized Cost	716,942
To state and local governments to secure public deposits, Fair Value	738,353
Other securities pledged principally to secure deposits, Amortized Cost	175,226
Other securities pledged principally to secure deposits, Fair Value	178,204
Total pledged securities, Amortized Cost	1,051,152
Total pledged securities, Fair Value	$ 1,081,177

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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