Stock-Based Compensation and Other Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding

The following tables present the activity during the three months ended March 31, 2018 related to restricted stock units from the 2016 Plan:

	2016 Stock Incentive Plan
	Restricted Stock Awards			Restricted Stock Unit Awards				Performance Restricted Stock Unit Awards
	Shares	Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value		Shares	Weighted Average Grant Date Fair Value
	(Dollars in thousands, except per share data)
Outstanding at January 1, 2018	96,133	$	42.23	88,015		$	50.34	73,144	$	47.85
Granted	—	—		60,635		56.11		84,836	56.10
Vested	—	—		(10,953	)	49.77		—	—
Outstanding at March 31, 2018	96,133	$	42.23	137,697		$	50.34	157,980	$	52.28

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

A summary of selected data related to stock-based compensation expense for the three months ended March 31, 2018 and 2017 are as follows:

	Restricted Stock Awards				Restricted Stock Unit Awards				Performance Restricted Stock Unit Awards
	March 31,				March 31,				March 31,
	2018		2017		2018		2017		2018		2017
	(Dollars in thousands)
Stock-based compensation expense	$	649	$	376	$	496	$	277	$	364	$	14
Unrecognized compensation expense related to stock-based compensation	$	2,464	$	6,409	$	6,957	$	851	$	6,928	$	3,486
Weighted-average life over which expense is expected to be recognized (years)	1.10		1.76		4.30		0.76		2.43		2.75

2009 Stock Option Plan

Schedule of Option Activity

Option grant activity for the period indicated is summarized as follows:

	2009 Stock Option Plan
	Options		Weighted Average Exercise Price
Outstanding at January 1, 2018	1,314,924		$	20.65
Granted	—		—
Exercised	(116,865	)	21.07
Forfeited	—		—
Expired	—		—
Outstanding at March 31, 2018	1,198,059		$	20.60
Exercisable at March 31, 2018	1,198,059		$	20.60
Vested at March 31, 2018	1,198,059		$	20.60
Vested and expected to vest at March 31, 2018	1,198,059		$	20.60

2013 Stock Incentive Plan

Schedule of Option Activity

Option grant activity for the period indicated is summarized as follows:

	2013 Stock Incentive Plan Options
	Options		Weighted Average Exercise Price
Outstanding at January 1, 2018	1,424,953		$	20.79
Granted	—		—
Exercised	(224,894	)	20.55
Forfeited	—		—
Expired	—		—
Outstanding at March 31, 2018	1,200,059		$	20.83
Exercisable at March 31, 2018	1,196,725		$	20.81
Vested at March 31, 2018	1,196,725		$	20.81
Vested and expected to vest at March 31, 2018	1,200,059		$	20.83

2016 Stock Incentive Plan

Schedule of Option Activity

Option grant activity for the period indicated is summarized as follows:

	2016 Stock Incentive Plan Options
	Options		Weighted Average Exercise Price
Outstanding at January 1, 2018	762,500		$	36.64
Granted	—		—
Exercised	—		—
Forfeited	(5,000	)	36.11
Expired	—		—
Outstanding at March 31, 2018	757,500		$	36.64
Exercisable at March 31, 2018	—		$	—
Vested at March 31, 2018	—		$	—
Vested and expected to vest at March 31, 2018	757,500		$	36.64