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Accumulated Other Comprehensive (Loss) Income (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Components of Accumulated Other Comprehensive (Loss) Income, Net of Taxes
The following table shows the components of accumulated other comprehensive (loss) income, net of taxes, for the periods presented:
(Dollars in thousands)
Net Unrealized
(Losses) Gains 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, 2016
$
(4,988
)
 
$
(141
)
 
$
(14,325
)
 
$
(19,454
)
Net Change
263

 
51

 
148

 
462

Balance, March 31, 2017
$
(4,725
)
 
$
(90
)
 
$
(14,177
)
 
$
(18,992
)
Balance, December 31, 2015
$
(592
)
 
$
(285
)
 
$
(15,831
)
 
$
(16,708
)
Net Change
1,413

 
(354
)
 
168

 
1,227

Balance, March 31, 2016
$
821

 
$
(639
)
 
$
(15,663
)
 
$
(15,481
)