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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2018
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, 2018 and 2017 (dollars in thousands, except per share amounts):
 
 
Three months ended March 31,
 
 
 
2018
 
2017
 
 
 
Net
Income
 
Weighted
Average
Common
Shares
Outstanding
 
Per
Share
Amount
 
Net
Income
 
Weighted
Average
Common
Shares
Outstanding
 
Per
Share
Amount
 
Net income
 
$
27,913

 
 
 
 
 
$
23,508

 
 
 
 
 
Basic earnings per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
Income available to common stockholders
 
$
27,913

 
64,768,977

 
$
0.43

 
$
23,508

 
64,167,376

 
$
0.37

 
Dilutive shares
 
 
 
180,465

 
 
 
 
 
202,229

 
 
 
Diluted earnings per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
Income available to common stockholders
 
$
27,913

 
64,949,442

 
$
0.43

 
$
23,508

 
64,369,605

 
$
0.37