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Change in Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Components of Accumulated Other Comprehensive Income (Loss)
 
(Dollars in thousands)
Net change in
investment
securities
available for sale
 
Net change in
securities held
to maturity
 
Net change in
defined benefit
plan
 
Net change in
fair value of
derivatives used
for
cash flow hedge
 
Total
Balance, December 31, 2014
$
446

 
$
2,207

 
$
847

 
$
—

 
$
3,500

Other comprehensive income before reclassifications
(1,417
)
 
—

 
—

 
—

 
(1,417
)
Less: Amounts reclassified from accumulated other comprehensive loss
(916
)
 
(412
)
 
(59
)
 
—

 
(1,387
)
Net current-period other comprehensive loss
(2,333
)
 
(412
)
 
(59
)
 
—

 
(2,804
)
Balance, December 31, 2015
$
(1,887
)
 
$
1,795

 
$
788

 
$
—

 
$
696

Other comprehensive loss 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 income (loss) before reclassifications
3,073

 
—

 
—

 
(184
)
 
2,889

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

 
(1,764
)
Net current-period other comprehensive income
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
)
Components of Other Comprehensive Income
Components of other comprehensive income that impact the Statement of Income are presented in the table below.
 
 
Twelve Months Ended
December 31,
 
Affected line item in
Consolidated Statements of
Income
(Dollars in thousands)
2017
 
2016
 
2015
 
 
Securities available for sale:
 
 
 
 
 
Realized gains on securities transactions
$
(1,984
)
 
$
(2,369
)
 
$
(1,478
)
 
Securities gains, net
Income taxes
704

 
900

 
562

 
Income tax provision
Net of tax
$
(1,280
)
 
$
(1,469
)
 
$
(916
)
 
 
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
$
(635
)
 
$
(651
)
 
$
(646
)
 
Interest income on
investment securities
Income taxes
241

 
248

 
234

 
Income tax provision
Net of tax
$
(394
)
 
$
(403
)
 
$
(412
)
 
 
Amortization of Defined Benefit Pension Items:
 
 
 
 
 
 
 
Prior service costs
$
(76
)
 
$
(76
)
 
$
(76
)
 
 
Transition obligation
—

 
—

 
—

 
 
Actuarial losses
(70
)
 
348

 
(20
)
 
 
Total before tax
$
(146
)
 
$
272

 
$
(96
)
 
Salaries, benefits and other compensation
Income taxes
56

 
(103
)
 
37

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

 
$
(59
)
 
 
Total reclassifications
$
(1,764
)
 
$
(1,703
)
 
$
(1,387
)