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Investments (Narrative) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Investments
Investment securities, aggregate fair value, continuous unrealized losses of more than 12 months	$ 2,050
Investment securities, aggregate unrealized loss, continuous unrealized losses of more than 12 months	76
Number of investments in continuous unrealized loss position for more than twelve months	18
Investment securities, aggregate carrying value, pledged as collateral	$ 2,684,107	$ 2,096,850	$ 1,694,084

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