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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2019
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)
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
Net income
$
16,468

 
$
4,357

 
$
32,547

 
$
17,207

Net income allocated to unvested restricted stock awards
(60
)
 
(33
)
 
(128
)
 
(132
)
Net income allocated to common shares
$
16,408

 
$
4,324

 
$
32,419

 
$
17,075

Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding
29,288

 
29,404

 
29,283

 
29,380

Average unvested restricted stock awards
(107
)
 
(228
)
 
(119
)
 
(221
)
Denominator for basic earnings per share—weighted-average shares outstanding
29,181

 
29,176

 
29,164

 
29,159

Effect of dilutive securities—employee stock options and restricted stock units
62

 
95

 
59

 
95

Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
29,243

 
29,271

 
29,223

 
29,254

Basic earnings per share
$
0.56

 
$
0.15

 
$
1.11

 
$
0.59

Diluted earnings per share
$
0.56

 
$
0.15

 
$
1.11

 
$
0.58

Average anti-dilutive options and restricted stock units excluded from computation of diluted earnings per share
325

 
369

 
327

 
294