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Earnings per Share (Tables)
 3 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of basic and diluted earnings per share
The following information was used in the computation of basic earnings per share (EPS) for the three months ended December 31, 2016 and 2015:
 
Three Months Ended
December 31,
 
2016
 
2015
 
(dollars in thousands, except per share data)
Net income
$
36,903

 
$
30,461

 
 
 
 
Weighted average common shares outstanding
58,750,522

 
55,253,712

Dilutive effect of stock based compensation
241,383

 
139,740

Weighted average common shares outstanding for diluted earnings per share calculation
58,991,905

 
55,393,452

 
 
 
 
Basic earnings per share
$
0.63

 
$
0.55

Diluted earnings per share
$
0.63

 
$
0.55