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Investments - Gross Unrealized Gains and Losses and Amortized Cost and Fair Value of Investments Classified as Held-to-Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | $ 601,314 | $ 645,164
Held-to-Maturity, Gross Unrealized Gains | 19,710 | 18,063
Held-to-Maturity, Gross Unrealized Losses | (243) | (951)
Held-to-Maturity, Fair Value | 620,781 | 662,276
States and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 418,155 | 408,447
Held-to-Maturity, Gross Unrealized Gains | 15,675 | 15,352
Held-to-Maturity, Gross Unrealized Losses | (96) | (45)
Held-to-Maturity, Fair Value | 433,734 | 423,754
Corporate Bonds [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 158,042 | 171,224
Held-to-Maturity, Gross Unrealized Gains | 1,698 | 159
Held-to-Maturity, Gross Unrealized Losses | (81) | (810)
Held-to-Maturity, Fair Value | 159,659 | 170,573
Commercial Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 290 | 37,494
Held-to-Maturity, Gross Unrealized Gains |  | 204
Held-to-Maturity, Gross Unrealized Losses |  | (15)
Held-to-Maturity, Fair Value | 290 | 37,683
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 10,943 | 13,223
Held-to-Maturity, Gross Unrealized Gains | 1,193 | 1,249
Held-to-Maturity, Gross Unrealized Losses |  | (1)
Held-to-Maturity, Fair Value | 12,136 | 14,471
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 11,863 | 12,487
Held-to-Maturity, Gross Unrealized Gains | 986 | 897
Held-to-Maturity, Gross Unrealized Losses | (1) | (4)
Held-to-Maturity, Fair Value | 12,848 | 13,380
Asset-Backed Securities [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 2,021 | 2,289
Held-to-Maturity, Gross Unrealized Gains | 158 | 202
Held-to-Maturity, Gross Unrealized Losses | (65) | (76)
Held-to-Maturity, Fair Value | $ 2,114 | $ 2,415

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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: 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=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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