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Investments - Net Effect on Stockholders' Equity of Unrealized Gains and Losses on AFS Securities (Parenthetical) (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |
Net unrealized gains for equity securities recognized in accumulated other comprehensive income (loss) prior to adoption of ASU 2016-01 | $ 9,796
Prior to adoption of ASU 2016-01 [Member] |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |
Net unrealized gains for equity securities recognized in accumulated other comprehensive income (loss) prior to adoption of ASU 2016-01 | $ 9,800

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References No definition available. + Details
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