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Low-Income Housing Tax Credits (Tables)
3 Months Ended
Mar. 31, 2018
Low-Income Housing Tax Credits [Abstract]  
Schedule of Tax Credits and Other Tax Benefits Recognized Related to Investments

  
Three Months Ended March 31,
 
Affected Line Item on
  
2018
  
2017
 
Consolidated Statement of Income
  
(in thousands)
  
Tax credits and other tax benefits
         
Amortization of operating losses
 
$
80
  
$
80
 
ATM and other losses
          
Tax benefit of operating losses*
 $
17
  
27
 
Income tax expense
             
Tax credits
  
124
   
95
 
Income tax expense
             
Total tax benefits
 
$
141
  
$
122
  
             
* Computed using a 21% tax rate for the first three months of 2018 and a 34% tax rate for the first three months of 2017