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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Unrealized Gains (Losses) on Available-for-Sale Securities, Beginning balance $ (183) $ (165)
Unrealized Gains (Losses) on Available-for-Sale Securities, Other comprehensive (loss) income 69 (92)
Unrealized Gains (Losses) on Available-for-Sale Securities, Ending balance (114) (257)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance (183) (165)
Other comprehensive (loss) income 69 (92)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance $ (114) $ (257)