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Earnings per Share
 6 Months Ended
Jun. 30, 2019
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 awards outstanding 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. Diluted earnings per share reflect additional common shares that would have been outstanding if options on common shares had been exercised, as well as any adjustment to income that would result from the assumed issuance, and if restricted stock units were vested. Potential common shares that may be issued by the Corporation relate to outstanding stock options and restricted stock units, and are determined using the treasury stock method. The effects of options to issue common stock and unvested restricted stock units are excluded from the computation of diluted earnings per share in periods in which the effect would be antidilutive. Anti-dilutive options are those options with weighted average exercise prices in excess of the weighted average market value. Anti-dilutive restricted stock units are those with hypothetical repurchases of shares, under the treasury stock method, exceeding the average restricted stock units outstanding for the periods presented.
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