Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Mandatory 401(k) match	$ 1.00
Maximum annual employer 401(k) contribution	5.50%
Amount expensed for 401(k) contributions	$ 1,700,000	$ 1,400,000	$ 1,400,000
Accrued liability for plan	1,600,000	1,600,000
Increase (decrease) in non-qualified deferred compensation plan	78,000	36,000	52,000
Aggregate payout under profit sharing plan	3,700,000	2,900,000	1,300,000
Supplemental Employee Retirement Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Contributions to supplemental plan	290,000	262,000	247,000
Accrued liability for plan	2,100,000	2,100,000
RML
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Mandatory 401(k) match	$ 1.00
Maximum annual employer 401(k) contribution	2.00%
RML | Supplemental Employee Retirement Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Contributions to supplemental plan	$ 997,000	580,000	$ 489,000
Accrued liability for plan	$ 2,600,000	$ 2,800,000
Vesting period	10 years