Employee and Director Benefits - Plan's funded status and pension cost (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Change in benefit obligation:
Beginning of year	$ 559,295	$ 487,077
Service cost	12,389	10,114
Interest cost	18,860	22,557
Loss/(gain)	97,340	69,547
Benefits paid	(75,000)	(30,000)
End of year	$ 612,884	$ 559,295