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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 ($)
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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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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