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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2018
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 three months ended March 31, 2018 and 2017 were:

  
Amounts Reclassified from AOCI
 
 (in thousands)
 
Three Months Ended
March 31
 
 
2018
  
2017
 
Affected line item in the statements of income
      
Securities gains (losses)
 
$
149
  
$
(8
)
Tax expense (benefit)
  
31
   
(3
)
Total reclassifications out of AOCI
 
$
118
  
$
(5
)