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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share, Basic and Diluted [Abstract]  
Summary of Computation for Basic and Diluted Earnings per Share
The following table sets forth the computation of basic and diluted earnings per share:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
(Dollars and shares in thousands, except per share data)
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net income
$
11,196

 
$
58

 
$
33,830

 
$
12,587

Net income allocated to unvested restricted stock
(96
)
 
—

 
(330
)
 
(102
)
Net income allocated to common shares
$
11,100

 
$
58

 
$
33,500

 
$
12,485

Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share—weighted-average shares outstanding
26,437

 
26,274

 
26,388

 
21,720

Effect of dilutive securities—employee stock options
105

 
67

 
102

 
41

Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
26,542

 
26,341

 
26,490

 
21,761

Basic earnings per share
$
0.42

 
$
—

 
$
1.27

 
$
0.58

Diluted earnings per share
$
0.42

 
$
—

 
$
1.27

 
$
0.57

Average anti-dilutive options excluded from computation of diluted earnings per share
185

 
201

 
166

 
550