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Stock-Based Compensation Plans - Summary of Stock Option Activity (Details)
 6 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Number of Shares  
Outstanding, beginning balance (in shares) | shares 2,186,511
Exercised (in shares) | shares (369,103)
Outstanding, ending balance (in shares) | shares 1,817,408
Exercisable, ending balance (in shares) | shares 1,817,408
Weighted Average Exercise Price  
Beginning balance (in dollars per share) | $ / shares $ 17.87
Exercised (in dollars per share) | $ / shares 19.09
Ending balance (in dollars per share) | $ / shares 17.63
Weighted average exercise price, exercisable, ending balance (in dollars per share) | $ / shares $ 17.63
Weighted Average Remaining Contractual Term (Years)  
Weighted average remaining contractual term, outstanding, end of period (in years) 3 years 6 months 25 days
Weighted average remaining contractual term, exercisable, end of period (in years) 3 years 6 months 25 days
Aggregate Intrinsic Value of In-the-Money Options  
Aggregate intrinsic value of in-the-money options, outstanding, end of period | $ $ 35,460,553
Aggregate intrinsic value of in-the-money options, exercisable, end of period | $ $ 35,460,553