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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income [Abstract]  
Amounts Reclassified from Accumulated Other Comprehensive Income (AOCI)
Amounts reclassified from accumulated other comprehensive income (AOCI) and the affected line items in the statements of income during the years ended December 31, 2017, 2016, and 2015 were:

  
Amounts Reclassified from AOCI
 
Year Ended December 31
(in thousands)
 
2017
  
2016
  
2015
 
Affected line item in the statements of income
         
Securities gains (losses)
 
$
73
  
$
522
  
$
(106
)
Tax expense (benefit)
  
26
   
183
   
(37
)
Total reclassifications out of AOCI
 
$
47
  
$
339
  
$
(69
)