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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 | Mar. 31, 2018 | Dec. 31, 2017
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Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | $ 473,458 | $ 469,739
Available-for-Sale, Gross Unrealized Gains | 3,735 | 7,851
Available-for-Sale, Gross Unrealized Losses | (6,504) | (2,714)
Available-for-Sale, Fair Value | 470,689 | 474,876
Total Fixed Maturity [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 462,033 | 461,236
Available-for-Sale, Gross Unrealized Gains | 3,735 | 7,072
Available-for-Sale, Gross Unrealized Losses | (6,504) | (2,714)
Available-for-Sale, Fair Value | 459,264 | 465,594
States and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 232,778 | 244,898
Available-for-Sale, Gross Unrealized Gains | 3,730 | 6,819
Available-for-Sale, Gross Unrealized Losses | (2,410) | (577)
Available-for-Sale, Fair Value | 234,098 | 251,140
Corporate Bonds [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 143,712 | 130,210
Available-for-Sale, Gross Unrealized Gains | 5 | 224
Available-for-Sale, Gross Unrealized Losses | (943) | (212)
Available-for-Sale, Fair Value | 142,774 | 130,222
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 18,260 | 18,813
Available-for-Sale, Gross Unrealized Losses | (1,275) | (799)
Available-for-Sale, Fair Value | 16,985 | 18,014
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 67,283 | 67,315
Available-for-Sale, Gross Unrealized Gains |  | 29
Available-for-Sale, Gross Unrealized Losses | (1,876) | (1,126)
Available-for-Sale, Fair Value | 65,407 | 66,218
Equity Securities [Member] |  |
Investment [Line Items] |  |
Available-for-Sale, Cost or Amortized Cost | 11,425 | 8,503
Available-for-Sale, Gross Unrealized Gains |  | 779
Available-for-Sale, Fair Value | $ 11,425 | $ 9,282

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- Definition 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) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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