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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Unrealized holding gains on available for sale securities, tax $ (229) $ 196
Pension liability adjustment, tax $ (27) $ 0