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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	Sep. 30, 2016	Dec. 31, 2015
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	$ 470,497	$ 386,109
Available-for-Sale, Gross Unrealized Gains	13,787	9,447
Available-for-Sale, Gross Unrealized Losses	(1,458)	(3,286)
Available-for-Sale, Fair Value	482,826	392,270
Other Investments [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	10,000	10,000
Available-for-Sale, Gross Unrealized Gains	2,174	2,217
Available-for-Sale, Fair Value	12,174	12,217
Total Fixed Maturity [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	460,497	376,109
Available-for-Sale, Gross Unrealized Gains	11,581	7,199
Available-for-Sale, Gross Unrealized Losses	(1,458)	(3,286)
Available-for-Sale, Fair Value	470,620	380,022
States and Political Subdivisions [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	188,689	164,684
Available-for-Sale, Gross Unrealized Gains	8,450	6,942
Available-for-Sale, Gross Unrealized Losses	(359)	(207)
Available-for-Sale, Fair Value	196,780	171,419
Corporate Bonds [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	197,167	202,537
Available-for-Sale, Gross Unrealized Gains	2,259	253
Available-for-Sale, Gross Unrealized Losses	(214)	(1,486)
Available-for-Sale, Fair Value	199,212	201,304
U.S. Agency-Based Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	12,026	8,888
Available-for-Sale, Gross Unrealized Gains	51	4
Available-for-Sale, Gross Unrealized Losses	(797)	(1,593)
Available-for-Sale, Fair Value	11,280	7,299
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	62,615
Available-for-Sale, Gross Unrealized Gains	821
Available-for-Sale, Gross Unrealized Losses	(88)
Available-for-Sale, Fair Value	63,348
Equity Securities [Member]
Investment [Line Items]
Available-for-Sale, Gross Unrealized Gains	32	31
Available-for-Sale, Fair Value	$ 32	$ 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
-Subparagraph (b)
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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
-Topic 320
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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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