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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity Under the Plan
The following is a summary of stock option activity under the 2016 Plan for the year ended December 31, 2018:
 
 
Number of
Shares
 
Weighted-
Average
Exercise
Price Per
Share
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
Outstanding - January 1, 2018
1,075,423

 
$
15.06

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(57,198
)
 
7.88

 
 
 
$
576,396

Expired
(11,594
)
 
16.11

 
 
 
 
Forfeited
(24,000
)
 
17.18

 
 
 
 
Outstanding - December 31, 2018
982,631

 
$
15.41

 
6.48
 
$
720,633

Options exercisable - December 31, 2018
777,621

 
$
15.01

 
6.21
 
$
720,633
Summary of Restricted and Performance Unit Activity Under the Plan
The following is a summary of restricted and performance unit activity under the 2016 Plan for the year ended December 31, 2018:
 
Number of
Shares
 
Weighted-
Average
Grant
Date Fair
Value
Outstanding - January 1, 2018
379,419

 
$
16.50

Granted
277,725

 
16.25

Vested
(152,887
)
 
16.48

Forfeited
(25,366
)
 
16.43

Outstanding - December 31, 2018
478,891

 
$
16.37
Estimated Annual Stock-Based Compensation Expense
The estimated annual stock-based compensation expense as of December 31, 2018 for each of the succeeding years is indicated in the table below:
 
 
Stock Based
Compensation Expense
 
(Dollars in thousands)
For the year ended December 31:
 
2019
$
5,605

2020
5,929

2021
1,569

2022
175

2023
59

Total
$
13,337