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Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Contractual maturity of amortized cost and fair value of debt securities |  |
Amortized cost, Due in one year or less | $ 3,459 |
Amortized cost, Due after one year through five years | 74,943 |
Amortized cost, Due after five years through ten years | 22,022 |
Amortized cost, Due after ten years | 863 |
Amortized cost, Maturity period | 101,287 |
Amortized cost, Asset-backed securities | 109,340 |
Amortized cost, Total | 210,627 |
Fair value, Due in one year or less | 3,484 |
Fair value, Due after one year through five years | 76,232 |
Fair value, Due after five years through ten years | 22,966 |
Fair value, Due after ten years | 900 |
Fair value, Maturity period | 103,582 |
Fair value, Asset-backed securities | 113,206 |
Fair value, Total | $ 216,788 | $ 213,806

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