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Share-Based Compensation Plans - Company's stock option activity (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average fair market value of options granted (in dollars per share) $ 21.63
Employee Stock Option  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding at beginning of period | shares 1,125,383
Shares, Outstanding at end of period | shares 1,125,383
Shares, Exercisable at end of period | shares 640,512
Weighted Average Exercise Price, Outstanding at beginning of period (in dollars per share) $ 25.62
Weighted Average Exercise Price, Outstanding at end of period (in dollars per share) 25.62
Weighted Average Exercise Price, Exercisable at end of period (in dollars per share) $ 26.77
Weighted Average Remaining Contractual Life (Years), Outstanding - March 31, 2020 5 years 2 months 12 days
Weighted Average Remaining Contractual Life (Years), Exercisable - March 31, 2021 2 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding at March 31, 2021 | $ $ 685,000
Aggregate Intrinsic Value, Exercisable at March 31, 2021 | $ $ 0