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Other Comprehensive (Loss) Income - Activity in Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Beginning balance, accumulated other comprehensive income $ 1,411 $ 2,040 $ 3,729
Other comprehensive loss (1,524) (629) (1,689)
Ending balance, accumulated other comprehensive income (113) 1,411 2,040
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Beginning balance, accumulated other comprehensive income 1,411 2,040 3,729
Other comprehensive loss (1,524) (629) (1,689)
Ending balance, accumulated other comprehensive income $ (113) $ 1,411 $ 2,040