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Change in Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Changes to Accumulated Other Comprehensive (Loss) Income
Changes to accumulated other comprehensive (loss) income by component are shown net of taxes in the following tables for the period indicated:
(Dollars in thousands)
Net change in
investment
securities
available for sale
 
Net change in
investment securities held
to maturity
 
Net change in
defined benefit
plan
 
Net change in
fair value of
derivatives used
for
cash flow hedges
 
Total
Balance, December 31, 2015
$
(1,887
)
 
$
1,795

 
$
788

 
$
—

 
$
696

Other comprehensive income before reclassifications
(4,838
)
 
—

 
—

 
(1,772
)
 
(6,610
)
Less: Amounts reclassified from accumulated other comprehensive loss
(1,469
)
 
(403
)
 
169

 
—

 
(1,703
)
Net current-period other comprehensive loss
(6,307
)
 
(403
)
 
169

 
(1,772
)
 
(8,313
)
Balance, December 31, 2016
$
(8,194
)
 
$
1,392

 
$
957

 
$
(1,772
)
 
$
(7,617
)
Other comprehensive loss before reclassifications
3,073

 
—

 
—

 
(184
)
 
2,889

Less: Amounts reclassified from accumulated other comprehensive loss
(1,280
)
 
(394
)
 
(90
)
 
—

 
(1,764
)
Net current-period other comprehensive loss
1,793

 
(394
)
 
(90
)
 
(184
)
 
1,125

Less: Reclassification due to the adoption of ASU No. 2018-02
$
(1,441
)
 
$
225

 
$
(2
)
 
$
(442
)
 
$
(1,660
)
Balance, December 31, 2017
$
(7,842
)
 
$
1,223

 
$
865

 
$
(2,398
)
 
$
(8,152
)
Other comprehensive income (loss) before reclassifications
(6,695
)
 
6

 
22

 
(56
)
 
(6,723
)
Less: Amounts reclassified from accumulated other comprehensive income
(16
)
 
(450
)
 
(53
)
 
—

 
(519
)
Net current-period other comprehensive loss
(6,711
)
 
(444
)
 
(31
)
 
(56
)
 
(7,242
)
Balance, December 31, 2018
$
(14,553
)
 
$
779

 
$
834

 
$
(2,454
)
 
$
(15,394
)
Components of Other Comprehensive Income
Components of other comprehensive income that impact the Consolidated Statements of Income are presented in the table below.  
 
Twelve Months Ended
December 31,
 
Affected line item in
Consolidated Statements of
Income
(Dollars in thousands)
2018
 
2017
 
2016
 
 
Securities available for sale:
 
 
 
 
 
Realized gains on securities transactions
$
(21
)
 
$
(1,984
)
 
$
(2,369
)
 
Securities gains, net
Income taxes
5

 
704

 
900

 
Income tax provision
Net of tax
$
(16
)
 
$
(1,280
)
 
$
(1,469
)
 
 
Net unrealized holding gains on securities transferred between available-for-sale and held-to-maturity:
 
 
 
 
 
 
 
Amortization of net unrealized gains to income during the period
$
(586
)
 
$
(635
)
 
$
(651
)
 
Interest and dividends on
investment securities
Income taxes
136

 
241

 
248

 
Income tax provision
Net of tax
$
(450
)
 
$
(394
)
 
$
(403
)
 
 
Amortization of Defined Benefit Pension Items:
 
 
 
 
 
 
 
Prior service costs (credits) (1)
$
2

 
$
(76
)
 
$
(76
)
 
 
Transition obligation
—

 
—

 
—

 
 
Actuarial losses
(45
)
 
(70
)
 
348

 
 
Total before tax
$
(43
)
 
$
(146
)
 
$
272

 
Salaries, benefits and other compensation
Income taxes
(10
)
 
56

 
(103
)
 
Income tax provision
Net of tax
$
(53
)
 
$
(90
)
 
$
169

 
 
Total reclassifications
$
(519
)
 
$
(1,764
)
 
$
(1,703
)
 
 

(1) Prior service costs balance for year ended December 31, 2018 includes a tax true-up adjustment of $0.1 million from March 31, 2018. Note that the tax true-up was made to the deferred tax asset with an offset to AOCI and does not affect the actual net periodic benefit costs of the pension plan.