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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The dilutive impact of restricted stock and stock options is calculated under the treasury method.
 
Three Months Ended September 30,
 
Nine Months Ended
September 30,
(Dollars in thousands, except per share data)
2018
 
2017
 
2018
 
2017
Basic earnings per share
 
 
 
 
 
 
 
Net income
$
16,322

 
$
14,216

 
$
51,313

 
$
29,818

Average common stock outstanding
47,205,383

 
43,151,248

 
47,108,302

 
41,626,356

Net income per share
$
0.35

 
$
0.33

 
$
1.09

 
$
0.72

 
 
 
 
 
 
 
 
Diluted earnings per share
 
 
 
 
 
 
 
Net income
$
16,322

 
$
14,216

 
$
51,313

 
$
29,818

Average common stock outstanding
47,205,383

 
43,151,248

 
47,108,302

 
41,626,356

Add: Dilutive effect of employee restricted stock and stock options
823,947

 
640,860

 
794,791

 
671,780

Average diluted stock outstanding
48,029,330

 
43,792,108

 
47,903,093

 
42,298,136

Net income per share
$
0.34

 
$
0.32

 
$
1.07

 
$
0.70