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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 | Jun. 30, 2013 | Dec. 31, 2012
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Maturity in: |  |
Amortized Cost, 2013 | $ 73,418 |
Amortized Cost, 2014-2017 | 124,916 |
Amortized Cost, 2018-2022 | 42,272 |
Amortized Cost, Thereafter | 26,681 |
Mortgage-backed securities, Amortized Cost | 3,469 |
Total fixed-maturity securities, Amortized Cost | 270,486 | 272,895
Estimated Fair Value, 2013 | 73,167 |
Estimated Fair Value, 2014-2017 | 126,578 |
Estimated Fair Value, 2018-2022 | 40,983 |
Estimated Fair Value, Thereafter | 26,475 |
Mortgage-backed securities, Estimated Fair Value | 3,401 |
Total fixed-maturity securities, Estimated Fair Value | $ 270,604 | $ 281,547

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