Employee Benefits (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined contribution employee automatic contribution, percent			6.00%
Administrative expense			$ 0	$ 0
Award vesting period			6 years
Contributions, net of forfeitures, made to the defined contribution plan	$ 2,526,000	$ 2,242,000	$ 6,924,000	6,791,000
Profit sharing, percent of pre-tax profit paid to eligible employees on quarterly basis			10.00%
Profit sharing bonus plan expense	2,358,000	3,000,000	$ 7,409,000	8,691,000
Medical claim payments	2,342,000	2,985,000	6,188,000	6,843,000
Health saving account contributions	$ 888,000	$ 890,000	$ 2,621,000	$ 2,663,000
Each Year After Two Years of Service
Defined Benefit Plan Disclosure [Line Items]
Award vesting rights, percentage			20.00%
Effective January 1, 2016
Defined Benefit Plan Disclosure [Line Items]
Percent of match			175.00%
Defined contribution employer, maximum match percent			6.00%