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Other Comprehensive (Loss) Income (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Components of Other Comprehensive (Loss) Income
The following table presents the components of other comprehensive (loss) income both gross and net of tax, for the years ended December 31, 2017, 2016 and 2015 (in thousands):
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
 
Before
Tax
 
Tax
Effect
 
After
Tax
 
Before
Tax
 
Tax
Effect
 
After
Tax
 
Before
Tax
 
Tax
Effect
 
After
Tax
Components of Other Comprehensive (Loss)Income:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unrealized gains and losses on securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net (losses) gains arising during the period
$
(3,612
)
 
1,449

 
(2,163
)
 
(7,405
)
 
2,974

 
(4,431
)
 
(5,683
)
 
2,282

 
(3,401
)
Reclassification adjustment for gains included in net income
—

 
—

 
—

 
(50
)
 
20

 
(30
)
 
(654
)
 
263

 
(391
)
Total
(3,612
)
 
1,449

 
(2,163
)
 
(7,455
)
 
2,994

 
(4,461
)
 
(6,337
)
 
2,545

 
(3,792
)
Unrealized gains (losses) on derivatives (cash flow hedges)
633

 
(254
)
 
379

 
404

 
(162
)
 
242

 
(122
)
 
49

 
(73
)
Amortization related to post retirement obligations
(1,475
)
 
586

 
(889
)
 
5,628

 
(2,260
)
 
3,368

 
2,156

 
(866
)
 
1,290

Total other comprehensive (loss) income
$
(4,454
)
 
1,781

 
(2,673
)
 
(1,423
)
 
572

 
(851
)
 
(4,303
)
 
1,728

 
(2,575
)
Changes in Accumulated Other Comprehensive Income by Component, net of tax
The components of accumulated other comprehensive loss (gain) related to the pension plan and other post-retirement benefits, on a pre-tax basis, at December 31, 2017 and 2016 are summarized in the following table (in thousands):
 
Pension
 
Post-retirement
 
2017
 
2016
 
2017
 
2016
Unrecognized prior service cost
$
—

 
—

 
—

 
—

Unrecognized net actuarial loss (gain)
11,091

 
11,968

 
(4,781
)
 
(6,993
)
Total accumulated other comprehensive loss (gain)
$
11,091

 
11,968

 
(4,781
)
 
(6,993
)
The following table presents the changes in the components of accumulated other comprehensive (loss) income, net of tax, for the years ended December 31, 2017 and 2016, including the reclassification of income tax effects due to the adoption of ASU No. 2018-02 for the year ended December 31, 2017 (in thousands):
 
 
Changes in Accumulated Other Comprehensive (Loss) Income by Component, net of tax
For the Years Ended December 31,
 
 
2017
 
2016
 
 
Unrealized
Gains on Securities
Available for 
Sale
 
Post-Retirement
Obligations
 
Unrealized gains (losses) on Derivatives (cash flow hedges)
 
Accumulated
Other
Comprehensive
(Loss) Income
 
Unrealized
Gains on Securities
Available for 
Sale
 
Post-Retirement
Obligations
 
Unrealized gains (losses) on Derivatives (cash flow hedges)
 
Accumulated
Other
Comprehensive
(Loss) Income
Balance at the beginning of the period
 
$
(510
)
 
(3,056
)
 
169

 
(3,397
)
 
3,951

 
(6,424
)
 
(73
)
 
(2,546
)
Current period change in other comprehensive income (loss)
 
(2,163
)
 
(889
)
 
379

 
(2,673
)
 
(4,461
)
 
3,368

 
242

 
(851
)
Reclassification of tax effects due to the adoption of ASU No. 2018-02
 
(619
)
 
(901
)
 
125

 
(1,395
)
 
—

 
—

 
—

 
—

Balance at the end of the period
 
$
(3,292
)
 
(4,846
)
 
673

 
(7,465
)
 
(510
)
 
(3,056
)
 
169

 
(3,397
)
Reclassification Out of Accumulated Other Comprehensive Income
The following table summarizes the reclassifications out of accumulated other comprehensive (loss) income for the years ended December 31, 2017, 2016 and 2015 (in thousands):
 
 
Reclassifications Out of Accumulated Other Comprehensive
Income (Loss)
 
 
Amount reclassified from AOCI for the years ended December 31,
 
Affected line item in the Consolidated
Statement of Income
 
 
2017
 
2016
 
2015
 
 
Details of AOCI:
 
 
 
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
 
 
 
Realized net gains on the sale of securities available for sale
 
$
—

 
50

 
654

 
Net gain on securities transactions
 
 
—

 
(20
)
 
(263
)
 
Income tax expense
 
 
—

 
30

 
391

 
Net of tax
 
 
 
 
 
 
 
 
 
Post-retirement obligations:
 
 
 
 
 
 
 
 
Amortization of actuarial losses
 
243

 
943

 
774

 
Compensation and employee benefits (1)
 
 
(64
)
 
(379
)
 
(311
)
 
Income tax expense
 
 
179

 
564

 
463

 
Net of tax
 
 
 
 
 
 
 
 
 
Total reclassifications
 
$
179

 
594

 
854

 
Net of tax
 
 
 
 
 
 
 
 
 
 
 
(1) This item is included in the computation of net periodic benefit cost. See Note 11. Benefit Plans