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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Components of Accumulated Other Comprehensive (Loss) Income, Net of Taxes
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
Balance, December 31, 2012
$
8,344

 
$
(1,241
)
 
$
(14,023
)
 
$
(6,920
)
Net Change
(9,816
)
 
1,241

 
5,540

 
(3,035
)
Balance, December 31, 2013
(1,472
)
 
—

 
(8,483
)
 
(9,955
)
Net Change
3,183

 
(157
)
 
(7,533
)
 
(4,507
)
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
)
Amounts Reclassified Out of Each Component of Accumulated Comprehensive (Loss) Income
The following table illustrates the amounts reclassified out of each component of accumulated comprehensive loss for the periods presented:
Details about Accumulated Other
Comprehensive Loss Components
 
Amount Reclassified from Accumulated
Other Comprehensive Loss
 
Affected Line Item in the
Statement of Income
 
 
For the years ended December 31,
 
 
(Dollars in thousands)
 
2015
 
2014
 
2013
 
 
Net unrealized holding gains on available-for-sale investment securities:
 
 
 
 
 
 
 
 
 
 
$
1,265

 
$
635

 
$
3,389

 
Net gain on sales of investment securities
 
 
(5
)
 
—

 
—

 
Other-than-temporary impairment on equity securities
 
 
1,260

 
635

 
3,389

 
Total before tax
 
 
(441
)
 
(222
)
 
(1,186
)
 
Tax expense
 
 
$
819

 
$
413

 
$
2,203

 
Net of tax
Cash flow hedge derivative:
 
 
 
 
 
 
 
 
 
 
$
—

 
$
—

 
$
(1,866
)
 
Net loss on interest rate swap
 
 
—

 
—

 
(1,866
)
 
Total before tax
 
 
—

 
—

 
653

 
Tax benefit
 
 
$
—

 
$
—

 
$
(1,213
)
 
Net of tax
Defined benefit pension plans:
 
 
 
 
 
 
 
 
Amortization of net loss included in net periodic pension costs*
 
$
(1,362
)
 
$
(666
)
 
$
(1,282
)
 
 
Accretion of prior service cost included in net periodic pension costs*
 
280

 
288

 
255

 
 
 
 
(1,082
)
 
(378
)
 
(1,027
)
 
Total before tax
 
 
379

 
132

 
360

 
Tax benefit
 
 
$
(703
)
 
$
(246
)
 
$
(667
)
 
Net of tax
*
These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. (See Note 10—Retirement Plans and Other Postretirement Benefits for additional details.)