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Share-Based Compensation Plans - Company's stock option activity (Details) - Employee Stock Option
 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding at beginning of period | shares 1,125,383
Shares, Granted | shares 186,900
Shares, Exercised | shares (1,200)
Shares, Forfeited or expired | shares (27,015)
Shares, Outstanding at end of period | shares 1,284,068
Shares, Exercisable at end of period | shares 769,857
Weighted Average Exercise Price, Outstanding at beginning of period (in dollars per share) | $ / shares $ 25.62
Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares 24.00
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares 18.00
Weighted Average Exercise Price, Forfeited or expired (in dollars per share) | $ / shares 24.22
Weighted Average Exercise Price, Outstanding at end of period (in dollars per share) | $ / shares 25.43
Weighted Average Exercise Price, Exercisable at end of period (in dollars per share) | $ / shares $ 26.58
Weighted Average Remaining Contractual Term (Years), Outstanding - September 30, 2021 5 years 4 months 24 days
Weighted Average Remaining Contractual Term (Years), Exercisable, Outstanding - September 30, 2021 4 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding at September 30, 2021 | $ $ 829,000
Aggregate Intrinsic Value, Exercisable at September 30, 2021 | $ $ 171,000