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Income Taxes (Tables)
9 Months Ended
Sep. 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
September 30,
   
Nine Months Ended
September 30,
 
 
2019
   
2018
   
2019
   
2018
 
Provision for income taxes
  $
266
    $
227
    $
805
    $
724
 
Effective income tax rate
   
4.3
%    
1.7
%    
5.9
%    
2.8
%