Pension Plan (Details) - The funded status of the plan - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Plan (Details) - The funded status of the plan [Line Items]
Projected benefit obligation at beginning of year	$ 14,320,000	$ 13,408,000
Interest cost	455,000	466,000
Actuarial (gain) loss	(908,000)	1,067,000
Benefits paid	(902,000)	(621,000)
Projected benefit obligation at end of year	12,965,000	14,320,000
Fair value of plan assets at beginning of year	10,130,000	8,984,000
Actual return on plan assets	(1,002,000)	1,469,000
Company contributions	421,000	298,000
Benefits paid	(902,000)	(621,000)
Fair value of plan assets at end of year	8,647,000	10,130,000
Funded status (underfunded)	(4,318,000)	(4,190,000)
Net actuarial loss	$ 7,954,000	$ 7,301,000	$ 7,206,000
Discount rate:
Components of cost	3.65%	4.17%
Benefit obligations	4.30%	3.66%
Expected return on plan assets	8.00%	8.00%
Rate of compensation increase