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Available-for-sale securities (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Available-for-sale securities [Abstract]      
Cost $ 10,383 $ 10,546 $ 10,467
Gross unrealized gains 9 8 46
Gross unrealized losses (94) (105) (14)
Fair value 10,298 10,449 10,499
Mortgage backed securities [Member]      
Available-for-sale securities [Abstract]      
Cost 9,971 10,546 10,467
Gross unrealized gains 8 8 46
Gross unrealized losses (94) (105) (14)
Fair value 9,885 $ 10,449 $ 10,499
US Treasury securities [Member]      
Available-for-sale securities [Abstract]      
Cost 412    
Gross unrealized gains 1    
Gross unrealized losses 0    
Fair value $ 413