Employee and Director Benefits - Plan's funded status and pension cost (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Change in benefit obligation:
Beginning of year	$ 487,077	$ 440,630
Service cost	10,114	11,965
Interest cost	22,557	12,687
Loss/(gain)	69,547	36,795
Benefits paid	(30,000)	(15,000)
End of year	$ 559,295	$ 487,077