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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Provision for Income Taxes and Effective Income Tax Rates
The provision for income taxes and the effective income tax rates were as follows (dollars in thousands):
 
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
 
2019
   
2018
   
2019
   
2018
 
Provision for income taxes
  $
 113
    $
 363
    $
 539
    $
 497
 
Effective income tax rate
   
4.2
%    
4.4
%    
7.3
%    
4.0
%