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Condensed Consolidated Statement of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Unrealized gain (loss) on securities arising during period, tax $ 1 $ 3 $ (4,000) $ 1,000