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Investments, Securities with Continuous Unrealized Loss Position (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) Securities | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) Securities
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |
Less than 12 months | $ 85,665 |  | $ 29,783
12 months or longer | 0 |  | 6,037
Total | 85,665 |  | 35,820
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |
Less than 12 months | 8,139 |  | 220
12 months or longer | 0 |  | 127
Total | 8,139 |  | $ 347
Gross OTTI losses charged to realized gains | $ 0 | $ 0 |
Number of securities in unrealized loss position | Securities | 69 |  | 30
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 | $ 1,858 |  | $ 3,432
12 months or longer | 0 |  | 3,533
Total | 1,858 |  | 6,965
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |
Less than 12 months | 61 |  | 22
12 months or longer | 0 |  | 31
Total | 61 |  | 53
Obligations of States and Political Subdivisions [Member] |  |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |
Less than 12 months | 4,153 |  | 3,106
12 months or longer | 0 |  | 0
Total | 4,153 |  | 3,106
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |
Less than 12 months | 10 |  | 53
12 months or longer | 0 |  | 0
Total | 10 |  | 53
Corporate Securities [Member] |  |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |
Less than 12 months | 79,654 |  | 23,245
12 months or longer | 0 |  | 2,504
Total | 79,654 |  | 25,749
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |
Less than 12 months | 8,068 |  | 145
12 months or longer | 0 |  | 96
Total | $ 8,068 |  | $ 241

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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=118939692&loc=d3e27337-111563 + Details
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