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Investment Securities (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments Debt And Equity Securities [Abstract]      
Gains realized on sales $ 38 $ 623 $ 8
Losses realized on sales (33) (21) 0
Other-than-temporary impairment recognized 0 0 0
Investment securities gains $ 5 $ 602 $ 8