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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Summary of the activity in the Option Plan
Below is a summary of the stock option activity in the Plans for the year ended December 31, 2018:
 
2018
 
Number of Stock Options Outstanding
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic value
 
 
 
 
 
(in years)
 
(dollars in thousands)
Outstanding at January 1, 2018
954,523

 
$
13.89

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(255,178
)
 
9.71

 
 
 
 
Forfeited and Expired
(17,412
)
 
21.53

 
 
 
 
Outstanding at December 31, 2018
681,933

 
$
15.26

 
5.26
 
$
6,962

Vested and Exercisable at December 31, 2018
635,396

 
$
15.11

 
5.04
 
$
6,715
Schedule of Other Share-based Compensation, Activity
Below is a summary of the restricted stock activity in the Plans for the years ended December 31, 2018:
 
2018
 
Shares
 
Weighted Average Grant-Date Fair Value per share
Unvested at the beginning of the year
446,843

 
$
29.61

Granted
328,358

 
41.92

Vested
(125,038
)
 
28.53

Forfeited
(14,086
)
 
38.18

Unvested at the end of the year
636,077

 
$
35.98