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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Schedule of changes in accumulated other comprehensive income (loss), net of tax
The following table summarizes the changes in the accumulated balances of other comprehensive loss during the three and nine months ended September 30, 2018 and 2017 (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Beginning balance
$
(4,295
)
 
$
(3,633
)
 
$
(3,908
)
 
$
(3,838
)
Holding gains (losses) arising during period, net of tax
134

 
(4
)
 
(253
)
 
201

Ending balance
$
(4,161
)
 
$
(3,637
)
 
$
(4,161
)
 
$
(3,637
)