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Earnings per Share (Tables)
 6 Months Ended
Jun. 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 
 June 30,
 
Six Months Ended 
 June 30,
(Dollars and shares in thousands, except per share data)
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net income
$
11,778

 
$
5,240

 
$
22,634

 
$
12,529

Net income allocated to unvested restricted stock
(122
)
 
(40
)
 
(234
)
 
(98
)
Net income allocated to common shares
$
11,656

 
$
5,200

 
$
22,400

 
$
12,431

Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share—weighted-average shares outstanding
26,380

 
19,434

 
26,363

 
19,418

Effect of dilutive securities—employee stock options
97

 
35

 
100

 
33

Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
26,477

 
19,469

 
26,463

 
19,451

Basic earnings per share
$
0.44

 
$
0.27

 
$
0.85

 
$
0.64

Diluted earnings per share
$
0.44

 
$
0.27

 
$
0.85

 
$
0.64

Average anti-dilutive options and awards excluded from computation of diluted earnings per share
302

 
619

 
272

 
603