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Available-for-sale securities (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract]    
Cost $ 11,536 $ 11,109
Gross Unrealized Gains 2 51
Gross Unrealized Losses 708 58
Fair Value 10,830 11,102
Mortgage-backed securities    
Debt Securities, Available-for-sale [Abstract]    
Cost 8,928 8,702
Gross Unrealized Gains 2 51
Gross Unrealized Losses 636 47
Fair Value 8,294 8,706
U.S. Treasury securities    
Debt Securities, Available-for-sale [Abstract]    
Cost 2,608 2,407
Gross Unrealized Gains 0 0
Gross Unrealized Losses 72 11
Fair Value $ 2,536 $ 2,396