Retirement Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Redemption fees for mutual fund's net asset value		$ 0
Executive Officer [Member] | SERP [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Plan expense recognized		$ 174	$ 33	$ 128
Discount rate for benefit obligations		3.10%	4.20%
Accrued compensation		$ 2,200	$ 2,449
401K Plan [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Recognized expense		2,500	2,216	$ 2,302
Mutual Funds [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Fair value of plan assets		2,829	2,352
Pooled Separate Accounts [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Fair value of plan assets		$ 2,554	$ 2,385
Scenario Forecast [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Contribution to plan	$ 150