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Share-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Statement of Weighted-Average Assumptions Used and Resulting Weighted-Average Fair Value of Option
The following table presents the weighted-average assumptions used and the resulting weighted-average fair value of each option granted for the years ended December 31, 2021, 2020 and 2019.
For the Years Ended December 31,
202120202019
Weighted-average risk-free interest rate1.09 %— %1.69 %
Expected dividend yield— %— %— %
Weighted-average expected volatility41.78 %— %29.92 %
Weighted-average expected life (in years)7.000.007.00
Weighted-average fair value of each option granted$13.24 $— $5.56 
Summary of Stock Option Activity
The following table summarizes stock option activity for the year ended December 31, 2021:
(dollars in thousands, except weighted-average exercise price)Number
of Options
Weighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term
in Years
Aggregate
Intrinsic
Value
Outstanding, December 31, 20202,306,339 $21.32 
Granted720,000 29.90 
Exercised(1,361,626)19.52 $39,293 
Expired(896)19.28 
Forfeited(140,336)28.02 
Outstanding, December 31, 20211,523,481 $26.37 7.0$59,411 
Exercisable at December 31, 2021194,356 $17.35 3.70$9,332 
Summary of Non-Vested Options
A summary of the status of Customers' non-vested options at December 31, 2021, and changes during the year ended December 31, 2021 was as follows:
Options
Weighted-
Average
exercise price
Non-vested at December 31, 20201,399,294 $24.55 
Granted720,000 29.90 
Vested(650,062)23.30 
Expired(896)19.28 
Forfeited(139,211)28.02 
Non-vested at December 31, 20211,329,125 27.69 
Status of Restricted Stock
The table below presents the status of the restricted stock units at December 31, 2021, and changes during the year ended December 31, 2021:
Restricted
Stock Units
Weighted-
Average Grant-
Date Fair Value
Outstanding and unvested at December 31, 20201,233,913 $20.35 
Granted201,648 29.96 
Vested(478,402)20.95 
Forfeited(30,915)19.04 
Outstanding and unvested at December 31, 2021926,244 22.16