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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2020

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, 2019 and 2018.

									2019						2018
Weighted-average risk-free interest rate									1.69		%				2.87		%
Expected dividend yield									—		%				—		%
Weighted-average expected volatility									29.92		%				25.47		%
Weighted-average expected life (in years)									7.00						7.00
Weighted-average fair value of each option granted									$	5.56					$	10.05

Summary of Stock Option Activity

The following table summarizes stock option activity for the year ended December 31, 2020:

			Number of Options						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term in Years						Aggregate Intrinsic Value
(dollars in thousands, except weighted-average exercise price)
Outstanding, December 31, 2019			2,830,248						$	21.59											$	9
Granted			—						—												—
Exercised			(12,834)						10.32												74
Expired			(1,834)						9.54												4
Forfeited			(509,241)						23.16												—
Outstanding, December 31, 2020			2,306,339						$	21.32					4.86						$	2,059
Exercisable at December 31, 2020			907,045						$	16.35					2.97						$	2,059

Summary of Non-Vested Options

A summary of the status of Customers' non-vested options at December 31, 2020, and changes during the year ended December 31, 2020 was as follows:

			Options						Weighted- Average exercise price
Non-vested at December 31, 2019			2,063,509						$	23.85
Granted			—						—
Vested			(405,751)						21.93
Forfeited			(258,464)						23.12
Non-vested at December 31, 2020			1,399,294						24.55

Status of Restricted Stock

The table below presents the status of the restricted stock units at December 31, 2020, and changes during the year ended December 31, 2020:

			Restricted Stock Units						Weighted- Average Grant- Date Fair Value
Outstanding and unvested at December 31, 2019			717,681						$	23.43
Granted			903,581						18.99
Vested			(363,647)						22.99
Forfeited			(23,702)						21.87
Outstanding and unvested at December 31, 2020			1,233,913						20.35

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Tabular disclosure of the changes in outstanding nonvested shares.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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