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Investments - Gross Unrealized Gains and Losses and Cost or Amortized Cost and Fair Value of Investments Classified as Available-for-Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	$ 489,871	$ 386,109
Available-for-Sale, Fair Value	492,460	392,270
Available-for-Sale, Gross Unrealized Gains	8,156	9,447
Available-for-Sale, Gross Unrealized Losses	(5,567)	(3,286)
Other Investments [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	10,000	10,000
Available-for-Sale, Fair Value	13,330	12,217
Available-for-Sale, Gross Unrealized Gains	3,330	2,217
Total Fixed Maturity [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	479,871	376,109
Available-for-Sale, Gross Unrealized Gains	4,793	7,199
Available-for-Sale, Gross Unrealized Losses	(5,567)	(3,286)
Available-for-Sale, Fair Value	479,097	380,022
States and Political Subdivisions [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	231,168	164,684
Available-for-Sale, Gross Unrealized Gains	4,340	6,942
Available-for-Sale, Gross Unrealized Losses	(3,215)	(207)
Available-for-Sale, Fair Value	232,293	171,419
Corporate Bonds [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	182,350	202,537
Available-for-Sale, Gross Unrealized Gains	436	253
Available-for-Sale, Gross Unrealized Losses	(271)	(1,486)
Available-for-Sale, Fair Value	182,515	201,304
U.S. Agency-Based Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	10,428	8,888
Available-for-Sale, Gross Unrealized Gains	17	4
Available-for-Sale, Gross Unrealized Losses	(1,103)	(1,593)
Available-for-Sale, Fair Value	9,342	7,299
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	55,925
Available-for-Sale, Gross Unrealized Losses	(978)
Available-for-Sale, Fair Value	54,947
Equity Securities [Member]
Investment [Line Items]
Available-for-Sale, Fair Value	33	31
Available-for-Sale, Gross Unrealized Gains	$ 33	$ 31

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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