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Available-for-sale securities (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale securities [Line Items]    
Available-for-sale securities, amortized cost basis $ 10,546 $ 10,443
Available-for-sale securities, gross unrealized gains 8 19
Available-for-sale securities, gross unrealized losses (105) (55)
Available-for-sale securities 10,449 10,407
Mortgage-backed securities    
Available-for-sale securities [Line Items]    
Available-for-sale securities, amortized cost basis 10,546 9,128
Available-for-sale securities, gross unrealized gains 8 19
Available-for-sale securities, gross unrealized losses (105) (49)
Available-for-sale securities $ 10,449 9,098
U.S. Treasury securities    
Available-for-sale securities [Line Items]    
Available-for-sale securities, amortized cost basis   1,315
Available-for-sale securities, gross unrealized gains   0
Available-for-sale securities, gross unrealized losses   (6)
Available-for-sale securities   $ 1,309