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Employee Benefit Plans - Other (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 22, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan Disclosure          
401(k) plan, percentage of employer match       3.00%  
401(k) plan, maximum percentage contribution by employer       6.00%  
Employer contribution $ 1,000,000.0        
SERP          
Defined Benefit Plan Disclosure          
SERP, accrued liability   $ 1,200,000   $ 1,200,000  
SERP, accrued expense   $ 97,000 $ 80,000 $ 193,000 $ 160,000