Employee Benefits (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined contribution employee automatic contribution, percent			6.00%
Administrative expense			$ 0	$ 0
Contributions, net of forfeitures, made to the defined contribution plan	$ 2,118,000	$ 2,099,000	$ 4,398,000	4,549,000
Profit sharing, percent of pre-tax profit paid to eligible employees on quarterly basis			10.00%
Profit sharing bonus plan expense	2,919,000	2,524,000	$ 5,051,000	5,691,000
Medical claim payments	2,033,000	1,983,000	3,846,000	3,858,000
Health saving account contributions	$ 876,000	$ 899,000	$ 1,733,000	$ 1,773,000
Effective January 1, 2016
Defined Benefit Plan Disclosure [Line Items]
Percent of match			175.00%
Defined contribution employer, maximum match percent			6.00%