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Investment securities available for sale (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Gross realized gains $ 162 $ 13 $ 218
Gross realized losses 0 (7) (428)
Available-for-sale Securities, Gross Realized Gain (Loss) $ 162 $ 6 $ (210)