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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 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
—

 
—

 
 
 
 
Expired
(18,962
)
 
16.67

 
 
 
 
Forfeited
(18,000
)
 
17.18

 
 
 
 
Outstanding - June 30, 2019
945,669

 
$
15.35

 
5.99
 
$
926

Options exercisable - June 30, 2019
799,669

 
$
15.02

 
5.78
 
$
926
Summary of Restricted and Performance Unit Activity Under the Plan
The following is a summary of restricted stock and performance unit activity under the 2016 Plan and 2019 Plan for the six months ended June 30, 2019:
 
Number of
Shares
 
Weighted-
Average Grant Date
Fair Value
Outstanding (unvested) - January 1, 2019
478,891

 
$
16.37

Granted
756,153

 
13.16

Vested
(84,755
)
 
16.79

Forfeited
(40,986
)
 
15.60

Outstanding (unvested) - June 30, 2019
1,109,303

 
$
14.18