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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
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