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Investments, Securities with Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | $ 125,291 | $ 53,282
12 months or longer | 44,324 | 45,404
Total | 169,615 | 98,686
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 6,509 | 816
12 months or longer | 4,491 | 3,105
Total | 11,000 | 3,921
U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member] |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | 11,636 | 12,175
12 months or longer | 14,630 | 12,737
Total | 26,266 | 24,912
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 359 | 162
12 months or longer | 730 | 349
Total | 1,089 | 511
Obligations of States and Political Subdivisions [Member] |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | 3,982 | 999
12 months or longer | 0 | 0
Total | 3,982 | 999
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 88 | 1
12 months or longer | 0 | 0
Total | 88 | 1
Corporate Securities [Member] |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | 109,673 | 40,108
12 months or longer | 29,694 | 32,667
Total | 139,367 | 72,775
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 6,062 | 653
12 months or longer | 3,761 | 2,756
Total | $ 9,823 | $ 3,409

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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