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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, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | $ 599,087 | $ 536,583
Held-to-Maturity, Gross Unrealized Gains | 27,020 | 25,934
Held-to-Maturity, Gross Unrealized Losses | (324) | (1,338)
Held-to-Maturity, Fair Value | 625,783 | 561,179
States and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 374,869 | 381,674
Held-to-Maturity, Gross Unrealized Gains | 21,092 | 18,634
Held-to-Maturity, Gross Unrealized Losses | (34) | (1,153)
Held-to-Maturity, Fair Value | 395,927 | 399,155
Corporate Bonds [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 144,898 | 67,423
Held-to-Maturity, Gross Unrealized Gains | 579 | 861
Held-to-Maturity, Gross Unrealized Losses | (204) | (41)
Held-to-Maturity, Fair Value | 145,273 | 68,243
Commercial Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 47,657 | 50,813
Held-to-Maturity, Gross Unrealized Gains | 2,371 | 3,431
Held-to-Maturity, Fair Value | 50,028 | 54,244
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 18,012 | 21,775
Held-to-Maturity, Gross Unrealized Gains | 1,735 | 1,790
Held-to-Maturity, Fair Value | 19,747 | 23,565
U.S. Treasury securities and obligations of U.S. Government agencies [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 10,703 | 11,514
Held-to-Maturity, Gross Unrealized Gains | 1,016 | 1,002
Held-to-Maturity, Gross Unrealized Losses | (1) |
Held-to-Maturity, Fair Value | 11,718 | 12,516
Asset-Backed Securities [Member] |  |
Investment [Line Items] |  |
Held-to-Maturity, Amortized Cost | 2,948 | 3,384
Held-to-Maturity, Gross Unrealized Gains | 227 | 216
Held-to-Maturity, Gross Unrealized Losses | (85) | (144)
Held-to-Maturity, Fair Value | $ 3,090 | $ 3,456

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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 (f) -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=28360136&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 (a) -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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- 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=27724398&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=27724398&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=27724398&loc=d3e27232-111563 + Details
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