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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 | Dec. 31, 2012 | Dec. 31, 2011
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Maturity in: |  |
Amortized Cost, 2013 | $ 82,371 |
Amortized Cost, 2014-2017 | 99,575 |
Amortized Cost, 2018-2022 | 39,888 |
Amortized Cost, Thereafter | 40,520 |
Mortgage-backed securities, Amortized Cost | 10,541 |
Total fixed-maturity securities, Amortized Cost | 272,895 | 298,978
Estimated Fair Value, 2013 | 82,577 |
Estimated Fair Value, 2014-2017 | 103,196 |
Estimated Fair Value, 2018-2022 | 40,136 |
Estimated Fair Value, Thereafter | 41,042 |
Mortgage-backed securities, Estimated Fair Value | 10,518 |
Total fixed-maturity securities, Estimated Fair Value | $ 277,469 | $ 304,045

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