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Available-for-sale securities (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Available-for-sale securities [Abstract]      
Cost $ 10,982 $ 11,032 $ 10,951
Gross Unrealized Gains 246 88 94
Gross Unrealized Losses 6 10 35
Fair Value 11,222 11,110 11,010
Mortgage-backed securities      
Available-for-sale securities [Abstract]      
Cost 9,812 9,804 10,771
Gross Unrealized Gains 239 87 94
Gross Unrealized Losses 6 10 35
Fair Value 10,045 9,881 10,830
U.S. Treasury securities      
Available-for-sale securities [Abstract]      
Cost 1,170 1,228 180
Gross Unrealized Gains 7 1 0
Gross Unrealized Losses 0 0 0
Fair Value $ 1,177 $ 1,229 $ 180