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Available-for-sale securities (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Available-for-sale securities [Abstract]      
Cost $ 9,882 $ 10,443 $ 10,167
Gross unrealized gains 43 19 33
Gross unrealized losses (17) (55) (22)
Fair value 9,908 10,407 10,178
Mortgage backed securities [Member]      
Available-for-sale securities [Abstract]      
Cost 9,882 9,128 7,843
Gross unrealized gains 43 19 29
Gross unrealized losses (17) (49) (18)
Fair value $ 9,908 9,098 7,854
US Treasury securities [Member]      
Available-for-sale securities [Abstract]      
Cost   1,315 2,324
Gross unrealized gains   0 4
Gross unrealized losses   (6) (4)
Fair value   $ 1,309 $ 2,324