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Income Taxes Reconciliation of the Change in Net Deferred Tax Assets to Deferred Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Change in net deferred tax assets | $ (1,468) | $ 1,419 | $ (970)
Deferred taxes allocated to other comprehensive income | (279) | (311) | (188)
Deferred Income Tax Expense (Benefit) | $ 1,747 | $ (1,108) | $ 1,158

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- Definition The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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