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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 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | $ 645,164 | $ 639,631
Held-to-Maturity, Gross Unrealized Gains | 18,063 | 25,404
Held-to-Maturity, Gross Unrealized Losses | (951) | (664)
Held-to-Maturity, Fair Value | 662,276 | 664,371
States and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 408,447 | 385,623
Held-to-Maturity, Gross Unrealized Gains | 15,352 | 20,100
Held-to-Maturity, Gross Unrealized Losses | (45) | (58)
Held-to-Maturity, Fair Value | 423,754 | 405,665
Corporate Bonds [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 171,224 | 176,880
Held-to-Maturity, Gross Unrealized Gains | 159 | 374
Held-to-Maturity, Gross Unrealized Losses | (810) | (520)
Held-to-Maturity, Fair Value | 170,573 | 176,734
Commercial Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 37,494 | 46,662
Held-to-Maturity, Gross Unrealized Gains | 204 | 1,867
Held-to-Maturity, Gross Unrealized Losses | (15) |
Held-to-Maturity, Fair Value | 37,683 | 48,529
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 13,223 | 16,972
Held-to-Maturity, Gross Unrealized Gains | 1,249 | 1,702
Held-to-Maturity, Gross Unrealized Losses | (1) | (2)
Held-to-Maturity, Fair Value | 14,471 | 18,672
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 12,487 | 10,697
Held-to-Maturity, Gross Unrealized Gains | 897 | 1,097
Held-to-Maturity, Gross Unrealized Losses | (4) | (2)
Held-to-Maturity, Fair Value | 13,380 | 11,792
Asset-Backed Securities [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 2,289 | 2,797
Held-to-Maturity, Gross Unrealized Gains | 202 | 264
Held-to-Maturity, Gross Unrealized Losses | (76) | (82)
Held-to-Maturity, Fair Value | $ 2,415 | $ 2,979

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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=27724398&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=51813488&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=27724398&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=27724398&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=27724398&loc=d3e27232-111563 + Details
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