Securities - Securities available-for-sale and held-to-maturity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Securities available-for-sale:
Amortized Cost	$ 38,051	$ 36,703
Gross Unrealized Gains	681	1,154
Gross Unrealized Losses	(2,654)	(882)
Debt Securities, Available-for-sale, Total	36,078	36,975
Securities held-to-maturity:
Held-to-maturity securities Amortized Cost	1,064	1,128
Held-to-maturity securities Gross Unrealized Gains	15	25
Held-to-maturity securities Gross Unrealized Losses	(4)	(3)
Held-to-maturity securities Fair Value	1,075	1,150
Equity securities:
Equity securities amortized Cost	338	350
Equity securities	338	350
Residential mortgage-backed - US agency and GSEs
Securities available-for-sale:
Amortized Cost	30	33
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(1)	(1)
Debt Securities, Available-for-sale, Total	30	33
Securities held-to-maturity:
Held-to-maturity securities Amortized Cost	1,064	1,128
Held-to-maturity securities Gross Unrealized Gains	15	25
Held-to-maturity securities Gross Unrealized Losses	(4)	(3)
Held-to-maturity securities Fair Value	1,075	1,150
Corporate bonds
Securities available-for-sale:
Amortized Cost	20,780	18,589
Gross Unrealized Gains	51	266
Gross Unrealized Losses	(1,742)	(812)
Debt Securities, Available-for-sale, Total	19,089	18,043
State and political subdivisions
Securities available-for-sale:
Amortized Cost	17,241	18,081
Gross Unrealized Gains	629	887
Gross Unrealized Losses	(911)	(69)
Debt Securities, Available-for-sale, Total	16,959	18,899
Large cap equity mutual fund
Equity securities:
Equity securities amortized Cost	44	45
Equity securities	44	45
Other mutual funds
Equity securities:
Equity securities amortized Cost	294	305
Equity securities	$ 294	$ 305