Employee Benefit Plan (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) ExecutiveOfficers	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Profit Sharing and Four Hundred One K Plan [Member]
Employee Benefit Plan (Textual)
Defined benefit plan, annual cost	$ 881,000	$ 693,000	$ 587,000
Supplemental Executive Retirement Plan [Member]
Employee Benefit Plan (Textual)
Defined benefit plan, annual cost	$ 1,600,000	657,000	$ 940,000
Number of executive officers | ExecutiveOfficers	26
Accrued benefit obligation	$ 8,200,000	$ 6,700,000