Investment Securities - Contractual maturity (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
After Five Years through Ten Years	$ 1,920,000
After Ten Years	2,778,000
Amortized Cost	4,698,000
Fair Value
After Five Years through Ten Years	1,931,000
After Ten Years	2,660,000
Fair value	4,591,000
Securities pledged to secure advances from the FHLB	0	$ 0
Sales and calls of available-for-sale investment securities	$ 0	$ 0