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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Fixed-Maturity Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Maturity in: |  |
Amortized Cost, 2013 | $ 89,942 |
Amortized Cost, 2014-2017 | 106,563 |
Amortized Cost, 2018-2022 | 43,180 |
Amortized Cost, Thereafter | 29,076 |
Mortgage-backed securities, Amortized Cost | 8,893 |
Total fixed-maturity securities, Amortized Cost | 277,654 | 272,895
Estimated Fair Value, 2013 | 90,034 |
Estimated Fair Value, 2014-2017 | 109,789 |
Estimated Fair Value, 2018-2022 | 43,405 |
Estimated Fair Value, Thereafter | 29,471 |
Mortgage-backed securities, Estimated Fair Value | 8,848 |
Total fixed-maturity securities, Estimated Fair Value | $ 281,547 | $ 277,469

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