Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts recognized in balance sheets [Abstract]
Current liabilities	$ (406)	$ (366)
Noncurrent liabilities	(7,893)	(7,028)
Total amount recognized in balance sheet	(8,299)	(7,394)
Net actuarial loss recognized in accumulated other comprehensive income (loss)	$ 1,923	1,063
SERP [Member]
Defined Benefit Plan [Abstract]
Percentage of final average earnings to annual benefits	55.00%
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of the year	$ 7,394	8,199
Interest cost	315	290	$ 321
Actuarial losses (gains)	906	(769)
Benefits paid	(316)	(326)
Benefit obligation at end of year	8,299	7,394	8,199
Change in plan assets [Roll Forward]
Employer contribution	316	326
Benefits paid	(316)	(326)
Fair value of plan assets at end of year	0	0
Funded status of the plan - (underfunded)	(8,299)	(7,394)
Accumulated benefit obligations	8,299	7,394
Net pension cost [Abstract]
Interest cost on projected benefit obligation	315	290	321
Amortization of actuarial loss	46	136	90
Net pension costs	361	$ 426	$ 411
SERP [Member] | Maximum [Member]
Defined Benefit Plan [Abstract]
Annual retirement benefits	$ 125