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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 | Sep. 30, 2013 | Dec. 31, 2012
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Maturity in: |  |
Amortized Cost, 2013 | $ 62,361 |
Amortized Cost, 2014-2017 | 130,860 |
Amortized Cost, 2018-2022 | 30,677 |
Amortized Cost, Thereafter | 23,333 |
Mortgage-backed securities, Amortized Cost | 2,385 |
Total fixed-maturity securities, Amortized Cost | 249,616 | 272,895
Estimated Fair Value, 2013 | 62,356 |
Estimated Fair Value, 2014-2017 | 132,576 |
Estimated Fair Value, 2018-2022 | 29,964 |
Estimated Fair Value, Thereafter | 23,072 |
Mortgage-backed securities, Estimated Fair Value | 2,332 |
Total fixed-maturity securities, Estimated Fair Value | $ 250,300 | $ 277,469

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