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Employee Benefits - Summary of Equity-Based Awards for Employees (Details)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Common Stock Awards  
Awards  
Nonvested common stock awards, Beginning balance (in shares) | shares 231,280
Granted (in shares) | shares 5,190
Forfeited/Cancelled (in shares) | shares (274)
Nonvested common stock awards, Ending balance (in shares) | shares 236,196
Weighted Average Grant Date Fair Value Per Share  
Nonvested performance-based stock awards, Beginning balance (in USD per share) | $ / shares $ 48.05
Granted (in USD per share) | $ / shares 123.32
Forfeited/Cancelled (in USD per share) | $ / shares 36.51
Nonvested performance-based stock awards, Ending balance (in USD per share) | $ / shares $ 49.72
Performance-Based Stock Awards  
Awards  
Nonvested performance-based stock awards/units, Beginning balance (in shares) | shares 166,961
Share-based awards granted (in shares) | shares 42,449
Forfeited/Cancelled (in shares) | shares 0
Nonvested performance-based stock awards/units, Ending balance (in shares) | shares 209,410
Weighted Average Grant Date Fair Value Per Share  
Nonvested performance-based stock awards/units, Beginning balance (in USD per share) | $ / shares $ 59.97
Granted (in USD per share) | $ / shares 123.32
Forfeited/Cancelled (in USD per share) | $ / shares 0
Nonvested performance-based stock awards/units, Ending balance (in USD per share) | $ / shares $ 72.81
Performance-Based Restricted Stock Units  
Awards  
Nonvested performance-based stock awards/units, Beginning balance (in shares) | shares 13,273
Share-based awards granted (in shares) | shares 0
Forfeited/Cancelled (in shares) | shares (99)
Nonvested performance-based stock awards/units, Ending balance (in shares) | shares 13,174
Weighted Average Grant Date Fair Value Per Share  
Nonvested performance-based stock awards/units, Beginning balance (in USD per share) | $ / shares $ 36.51
Granted (in USD per share) | $ / shares 0
Forfeited/Cancelled (in USD per share) | $ / shares 36.51
Nonvested performance-based stock awards/units, Ending balance (in USD per share) | $ / shares $ 36.51