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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity Under the Plan
The following is a summary of stock option activity under the 2016 Plan and 2019 Plan for the year ended December 31, 2019:
 
Number of
Shares
 
Weighted-
Average
Exercise
Price Per
Share
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
(Dollars in thousands)
Outstanding - January 1, 2019
982,631

 
$
15.41

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(702
)
 
13.10

 
 
 

Expired
(20,718
)
 
16.37

 
 
 
 
Forfeited
(26,000
)
 
17.18

 
 
 
 
Outstanding - December 31, 2019
935,211

 
$
15.34

 
5.41
 
$
1,040

Options exercisable - December 31, 2019
847,211

 
$
15.15

 
5.27
 
$
1,040
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 and 2019 Plan for the year ended December 31, 2019:
 
Number of
Shares
 
Weighted-
Average
Grant
Date Fair
Value
Outstanding - January 1, 2019
478,891

 
$
16.37

Granted
784,728

 
13.20

Vested
(119,147
)
 
16.91

Forfeited
(108,728
)
 
14.70

Outstanding - December 31, 2019
1,035,744

 
$
14.08
Estimated Annual Stock-Based Compensation Expense
The estimated annual stock-based compensation expense as of December 31, 2019 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:
 
2020
$
7,069

2021
4,623

2022
1,019

2023
167

2024
55

Total
$
12,933