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Securities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011
--- | --- | --- | ---
Securities Held for Investment and Securities Available for Sale |  |  |
Held for investment, at cost (market value: $17080) | $ 16,769 |  |
Available for sale, at market value | 523,706 |  |
Total | $ 540,475 | $ 614,977 | $ 607,046

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