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Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 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 
 March 31,
(Dollars and shares in thousands, except per share data)
2019
 
2018
Numerator:
 
 
 
Net income
$
16,079

 
$
12,850

Net income allocated to unvested restricted stock awards
(67
)
 
(97
)
Net income allocated to common shares
$
16,012

 
$
12,753

Denominator:
 
 
 
Weighted average shares outstanding
29,277

 
29,355

Average unvested restricted stock awards
(131
)
 
(215
)
Denominator for basic earnings per share—weighted-average shares outstanding
29,146

 
29,140

Effect of dilutive securities—employee stock options and restricted stock units
59

 
94

Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
29,205

 
29,234

Basic earnings per share
$
0.55

 
$
0.44

Diluted earnings per share
$
0.55

 
$
0.44

Average anti-dilutive options and restricted stock units excluded from computation of diluted earnings per share
348

 
217