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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Summary of earnings per share
Earnings per share consisted of the following components for the periods indicated:

 
Three Months Ended
 
Nine Months Ended
 
September 30
 
September 30
 
2019
 
2018
 
2019
 
2018
 
(Dollars in thousands, except per share data)
Net income
$
51,845

 
$
33,015

 
$
117,698

 
$
91,688

 
 
 
 
 
 
 
 
Weighted Average Shares
 
 
 
Basic shares
34,361,176

 
27,537,841

 
32,283,196

 
27,517,210

Effect of dilutive securities
39,390

 
63,499

 
45,416

 
62,596

Diluted shares
34,400,566

 
27,601,340

 
32,328,612

 
27,579,806

 
 
 
 
 
 
 
 
Net income per share
 
 
 
 
 
 
 
Basic EPS
$
1.51

 
$
1.20

 
$
3.65

 
$
3.33

Effect of dilutive securities
—

 
—

 
(0.01
)
 
(0.01
)
Diluted EPS
$
1.51

 
$
1.20

 
$
3.64

 
$
3.32
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] hey were anti-dilutive. There were no such options or shares of performance-based restricted stock that were anti-dilutive during the three months ended September 30, 2018 or during the nine months ended September 30, 2019 and 2018.