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Securities Gross Realized Gain Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]    
Available-for-sale Securities, Gross Realized Gains $ 51 $ 166
Available-for-sale Securities, Gross Realized Losses 0 (387)
Available-for-sale Securities, Gross Realized Gain (Loss), Net $ 51 $ (221)