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Investment Securities (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Contractual maturity of amortized cost and fair value of debt securities |  |
Amortized cost, Due in one year or less | $ 4,925 |
Amortized cost, Due after one year through five years | 62,579 |
Amortized cost, Due after five years through ten years | 36,614 |
Amortized cost, Due after ten years | 1,147 |
Amortized cost, Maturity period | 105,265 |
Amortized cost, Asset-backed securities | 122,624 |
Amortized cost, Total | 227,889 |
Fair value, Due in one year or less | 4,992 |
Fair value, Due after one year through five years | 63,740 |
Fair value, Due after five years through ten years | 37,214 |
Fair value, Due after ten years | 1,127 |
Fair value, Maturity period | 107,073 |
Fair value, Asset-backed securities | 124,918 |
Fair value, Total | $ 231,991 | $ 200,246

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