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Investment Securities (Details 4) (Available for sale investments, USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Available for sale investments |  |  |  |
Reconciliation of credit-related impairment charges on investments recognized in earnings |  |  |  |
Balance at the beginning | $ 9,801 | $ 8,831 | $ 9,393 | $ 8,416
Impairment charges recognized in earnings during period | 239 | 286 | 647 | 701
Balance at the end | $ 10,040 | $ 9,117 | $ 10,040 | $ 9,117

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