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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2014
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)

The following table presents income tax expense and the effective income tax rate for the quarters ended March 31, 2014 and 2013.

Income Tax Expense
(Dollar amounts in thousands)
 
Quarters Ended 
 March 31,
 
2014
 
2013
Income before income tax expense
$
25,836

 
$
20,935

Income tax expense:
 
 
 
Federal income tax expense
$
6,278

 
$
4,360

State income tax expense
1,894

 
1,933

Total income tax expense
$
8,172

 
$
6,293

Effective income tax rate
31.6
%
 
30.1
%