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Employee Compensation and Benefit Plans - Schedule of Equity-based Compensation Expense Related to Stock Options and Stock Awards and Related Excess Tax Benefit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity-based compensation expense:      
Awards $ 2,401 $ 2,697 $ 2,366
(Tax deficiency) excess tax benefit related to share-based awards (424) (381) 294
Stock Options      
Equity-based compensation expense:      
Awards (431) (121) (368)
Stock Awards      
Equity-based compensation expense:      
Awards 2,832 2,818 2,734
Liability Awards      
Equity-based compensation expense:      
Awards $ 5,642 $ 1,082 $ 0