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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2015
Accounting Policies [Abstract]  
Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Calculations
The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share calculations for the three months ended March 31, 2015 and 2014 (dollars in thousands, except per share amounts):
 
 
Three months ended March 31,
 
 
 
2015
 
2014
 
 
 
Net
Income
 
Weighted
Average
Common
Shares
Outstanding
 
Per
Share
Amount
 
Net
Income
 
Weighted
Average
Common
Shares
Outstanding
 
Per
Share
Amount
 
Net income
 
$
19,802

 
 
 
 
 
$
17,029

 
 
 
 
 
Basic earnings per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
Income available to common stockholders
 
$
19,802

 
62,673,887

 
$
0.32

 
$
17,029

 
57,369,039

 
$
0.30

 
Dilutive shares
 
 
 
167,064

 
 
 
 
 
159,380

 
 
 
Diluted earnings per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
Income available to common stockholders
 
$
19,802

 
62,840,951

 
$
0.32

 
$
17,029

 
57,528,419

 
$
0.30