Pension Plan (Details) - The funded status of the plan - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan (Details) - The funded status of the plan [Line Items]
Projected benefit obligation at beginning of year	$ 12,965,000	$ 14,320,000
Interest cost	501,000	455,000
Actuarial loss (gain)	1,565,000	(908,000)
Benefits paid	(773,000)	(902,000)
Projected benefit obligation at end of year	14,258,000	12,965,000
Fair value of plan assets at beginning of year	8,647,000	10,130,000
Actual return on plan assets	1,645,000	(1,002,000)
Company contributions	629,000	421,000
Benefits paid	(773,000)	(902,000)
Fair value of plan assets at end of year	10,148,000	8,647,000
Funded status (underfunded)	(4,110,000)	(4,318,000)
Net actuarial loss	$ 8,296,000	$ 7,954,000	$ 7,301,000
Discount rate:
Components of cost	4.30%	3.65%
Benefit obligations	3.20%	4.30%
Expected return on plan assets	8.00%	8.00%
Rate of compensation increase