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Investments in Securities and Fair Value (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |
Number of securities with unrealized losses | 51 | 31 |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | $ 0 | $ 26 | $ 234

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- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References No definition available. + Details
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