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Available-for-sale securities (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Available-for-sale securities [Abstract]      
Cost $ 11,171 $ 11,185 $ 10,982
Gross Unrealized Gains 127 156 246
Gross Unrealized Losses 30 14 6
Fair Value 11,268 11,327 11,222
Mortgage-backed securities      
Available-for-sale securities [Abstract]      
Cost 8,278 9,799 9,812
Gross Unrealized Gains 127 156 239
Gross Unrealized Losses 9 9 6
Fair Value 8,396 9,946 10,045
U.S. Treasury securities      
Available-for-sale securities [Abstract]      
Cost 2,893 1,386 1,170
Gross Unrealized Gains 0 0 7
Gross Unrealized Losses 21 5 0
Fair Value $ 2,872 $ 1,381 $ 1,177