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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
The following table shows the components of accumulated other comprehensive loss, net of tax benefit, for the periods presented:
(Dollars in thousands)
Net Unrealized
Gains (Losses) on
Available-for-Sale
Investment
Securities
 
Net Change
Related to
Derivatives Used
for Cash Flow
Hedges
 
Net Change
Related to
Defined Benefit
Pension Plans
 
Accumulated
Other
Comprehensive
Loss (Income)
Balance, December 31, 2014
$
1,711

 
$
(157
)
 
$
(16,016
)
 
$
(14,462
)
Net Change
(2,303
)
 
(128
)
 
185

 
(2,246
)
Balance, December 31, 2015
(592
)
 
(285
)
 
(15,831
)
 
(16,708
)
Net Change
(4,396
)
 
144

 
1,506

 
(2,746
)
Balance, December 31, 2016
(4,988
)
 
(141
)
 
(14,325
)
 
(19,454
)
Net Change
927

 
150

 
606

 
1,683

Balance, December 31, 2017
$
(4,061
)
 
$
9

 
$
(13,719
)
 
$
(17,771
)