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Employee Benefits (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 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 $ 2,280,000 2,450,000
Profit sharing, percent of pre-tax profit paid to eligible employees on quarterly basis 10.00%  
Profit sharing bonus plan expense $ 2,132,000 3,167,000
Medical claim payments 1,813,000 1,875,000
Health saving account contributions $ 857,000 $ 874,000
Effective January 1, 2016    
Defined Benefit Plan Disclosure [Line Items]    
Percent of match 175.00%  
Defined contribution employer, maximum match percent 6.00%