Employee and Director Benefits - Retiree accrued liability expected to be reversed (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Employee and Director Benefits
One year or less	$ 30,000	$ 30,000
Over one year to two years	30,000	30,000
Over two years to three years	30,000	30,000
Over three years to four years	30,000	30,000
Over four years to five years	15,000	30,000
Thereafter	135,000	126,000
Defined Benefit Plan, Accrued Liability	$ 270,000	$ 276,000