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Available-for-sale securities (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Available-for-sale securities [Line Items]    
Cost $ 11,185 $ 11,032
Gross Unrealized Gains 156 88
Gross Unrealized Losses 14 10
Fair Value 11,327 11,110
Mortgage-backed securities    
Available-for-sale securities [Line Items]    
Cost 9,799 9,804
Gross Unrealized Gains 156 87
Gross Unrealized Losses 9 10
Fair Value 9,946 9,881
U.S. Treasury securities    
Available-for-sale securities [Line Items]    
Cost 1,386 1,228
Gross Unrealized Gains 0 1
Gross Unrealized Losses 5 0
Fair Value $ 1,381 $ 1,229