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Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 2016
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)
2016
 
2015
Numerator:
 
 
 
Net income
$
7,289

 
$
6,116

Net income allocated to unvested restricted stock
(59
)
 
(46
)
Net income allocated to common shares
$
7,230

 
$
6,070

Denominator:
 
 
 
Denominator for basic earnings per share—weighted-average shares outstanding
19,402

 
19,776

Effect of dilutive securities—employee stock options
31

 
24

Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
19,433

 
19,800

Basic earnings per share
$
0.37

 
$
0.31

Diluted earnings per share
$
0.37

 
$
0.31

Average anti-dilutive options and awards excluded from computation of diluted earnings per share
588

 
632