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Investment Securities (Details 4) (Available for sale investments, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Available for sale investments |  |  |
Reconciliation of credit-related impairment charges on investments recognized in earnings |  |  |
Balance at the beginning | $ 9,393 | $ 8,416 |
Impairment charges recognized in earnings during period | 1,039 | 977 | 8,416
Balance at the end | $ 10,432 | $ 9,393 | $ 8,416

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