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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Unrealized gain (loss) on available for sale securities $ (1,108) $ 169
Unrecognized gains on post-retirement benefits 181 132
Tax effect 195 (64)
Accumulated other comprehensive income (loss) $ (732) $ 237