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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [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 periods presented.

	2018				2017				2016
Weighted-average risk-free interest rate	2.87		%		2.35		%		1.84		%
Expected dividend yield	—		%		—		%		—		%
Weighted-average expected volatility	25.47		%		25.05		%		23.39		%
Weighted-average expected life (in years)	7.00				7.00				7.00
Weighted-average fair value of each option granted	$	10.05			$	8.68			$	7.61

Summary of Stock Option Activity

The following table summarizes stock option activity for the year ended December 31, 2018:

	Number of Shares			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, 2017	2,718,694			$	21.52
Granted	10,000			29.48
Exercised	(197,918	)		14.06						$	3,123
Forfeited	(10,250	)		21.96
Outstanding, December 31, 2018	2,520,526			$	22.13			6.40		$	2,311
Exercisable at December 31, 2018	849,303			$	16.29			3.68		$	2,276

Summary of Non-Vested Options

A summary of the status of Customers' non-vested options at December 31, 2018, and changes during the year ended December 31, 2018, is as follows:

	Options			Weighted- Average exercise price
Non-vested at December 31, 2017	2,621,731			$	21.85
Granted	10,000			29.48
Vested	(950,258	)		16.22
Forfeited	(10,250	)		21.96
Non-vested at December 31, 2018	1,671,223			25.10

Status of Restricted Stock

The table below presents the status of the restricted stock units at December 31, 2018, and changes during the year ended December 31, 2018:

	Restricted Stock Units			Weighted- Average Grant- Date Fair Value
Outstanding and unvested at December 31, 2017	590,036			$	24.74
Granted	433,614			23.63
Vested	(97,414	)		25.66
Forfeited	(41,577	)		27.05
Outstanding and unvested at December 31, 2018	884,659			23.99

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Tabular disclosure of the changes in outstanding nonvested shares.

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-Name Accounting Standards Codification
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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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