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Earnings per Share
 6 Months Ended
Jun. 30, 2016
Earnings Per Share, Basic and Diluted [Abstract]  
Earnings per Share
Earnings per Share
The Corporation uses the two-class method to calculate earnings per share as the unvested restricted stock issued under the Corporation's equity incentive plans are participating shares with nonforfeitable rights to dividends. Under the two-class method, earnings per common share are computed by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding for the period. In applying the two-class method, undistributed earnings are allocated to both common shares and participating securities based on the number of weighted average shares outstanding during the period.
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)
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net income
$
5,240

 
$
6,466

 
$
12,529

 
$
12,582

Net income allocated to unvested restricted stock
(40
)
 
(49
)
 
(98
)
 
(93
)
Net income allocated to common shares
$
5,200

 
$
6,417

 
$
12,431

 
$
12,489

Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share—weighted-average shares outstanding
19,434

 
19,501

 
19,418

 
19,638

Effect of dilutive securities—employee stock options
35

 
29

 
33

 
26

Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
19,469

 
19,530

 
19,451

 
19,664

Basic earnings per share
$
0.27

 
$
0.33

 
$
0.64

 
$
0.64

Diluted earnings per share
$
0.27

 
$
0.33

 
$
0.64

 
$
0.64

Average anti-dilutive options and awards excluded from computation of diluted earnings per share
619

 
567

 
603

 
555