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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Comprehensive Income
The following table presents the tax effects allocated to each component of other comprehensive income (loss) for the years ended December 31, 2017, 2016 and 2015. Components of other comprehensive income (loss) include changes in net unrealized gains and losses on securities available for sale (including the non-credit portion of other-than-temporary impairment charges relating to certain securities during the period); unrealized gains and losses on derivatives used in cash flow hedging relationships; and the pension benefit adjustment for the unfunded portion of various employee, officer and director pension plans. 
 
2017
 
2016
 
2015
 
Before
Tax
 
Tax
Effect
 
After
Tax
 
Before
Tax
 
Tax
Effect
 
After
Tax
 
Before
Tax
 
Tax
Effect
 
After
Tax
 
(in thousands)
Unrealized gains and losses on available for sale (AFS) securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net gains (losses) arising during the period
$
636

 
$
(284
)
 
$
352

 
$
(7,294
)
 
$
3,001

 
$
(4,293
)
 
$
(3,458
)
 
$
1,458

 
$
(2,000
)
Less reclassification adjustment for net losses (gains) included in net income (1)
20

 
(9
)
 
11

 
(777
)
 
312

 
(465
)
 
(2,487
)
 
1,041

 
(1,446
)
Net change
656

 
(293
)
 
363

 
(8,071
)
 
3,313

 
(4,758
)
 
(5,945
)
 
2,499

 
(3,446
)
Non-credit impairment losses on securities available for sale and held to maturity 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net change in non-credit impairment losses on securities
849

 
(351
)
 
498

 
719

 
(302
)
 
417

 
(416
)
 
175

 
(241
)
Less reclassification adjustment for accretion of credit impairment losses included in net income (2)
(284
)
 
117

 
(167
)
 
(921
)
 
382

 
(539
)
 
(728
)
 
304

 
(424
)
Net change
565

 
(234
)
 
331

 
(202
)
 
80

 
(122
)
 
(1,144
)
 
479

 
(665
)
Unrealized gains and losses on derivatives (cash flow hedges)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net gains (losses) arising during the period
1,005

 
(429
)
 
576

 
(4,035
)
 
1,574

 
(2,461
)
 
(12,360
)
 
5,121

 
(7,239
)
Less reclassification adjustment for net losses included in net income (3)
8,579

 
(3,551
)
 
5,028

 
13,034

 
(5,393
)
 
7,641

 
7,075

 
(2,948
)
 
4,127

Net change
9,584

 
(3,980
)
 
5,604

 
8,999

 
(3,819
)
 
5,180

 
(5,285
)
 
2,173

 
(3,112
)
Defined benefit pension plan
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net (losses) gains arising during the period
(3,843
)
 
1,121

 
(2,722
)
 
5,837

 
(2,539
)
 
3,298

 
6,030

 
(2,586
)
 
3,444

Amortization of prior service credit (cost )(4)
268

 
(77
)
 
191

 
(300
)
 
119

 
(181
)
 
206

 
(89
)
 
117

Amortization of net loss (4)
381

 
(133
)
 
248

 
294

 
(109
)
 
185

 
790

 
(328
)
 
462

Net change
(3,194
)
 
911

 
(2,283
)
 
5,831

 
(2,529
)
 
3,302

 
7,026

 
(3,003
)
 
4,023

Total other comprehensive income (loss)
$
7,611

 
$
(3,596
)
 
$
4,015

 
$
6,557

 
$
(2,955
)
 
$
3,602

 
$
(5,348
)
 
$
2,148

 
$
(3,200
)

 
(1)
Included in gains on securities transactions, net.
(2)
Included in interest and dividends on investment securities (taxable).
(3)
Included in interest expense.
(4)
Included in the computation of net periodic pension cost. See Note 12 for details.
Schedule of Accumulated Other Comprehensive Loss
The following table presents the after-tax changes in the balances of each component of accumulated other comprehensive loss for the years ended December 31, 2017, 2016 and 2015: 
 
Components of Accumulated Other Comprehensive Loss
 
Total
Accumulated
Other
Comprehensive
Loss
 
Unrealized Gains
and Losses on AFS Securities
 
Non-credit
Impairment
Losses on
Securities
 
Unrealized Gains
and Losses on
Derivatives
 
Defined
Benefit
Pension
Plan
 
 
(in thousands)
Balance-December 31, 2014
$
(1,890
)
 
$
145

 
$
(14,532
)
 
$
(26,218
)
 
$
(42,495
)
Other comprehensive (loss) income before reclassifications
(2,000
)
 
(241
)
 
(7,239
)
 
3,444

 
(6,036
)
Amounts reclassified from other comprehensive (loss) income
(1,446
)
 
(424
)
 
4,127

 
579

 
2,836

Other comprehensive (loss) income, net
(3,446
)
 
(665
)
 
(3,112
)
 
4,023

 
(3,200
)
Balance-December 31, 2015
(5,336
)
 
(520
)
 
(17,644
)
 
(22,195
)
 
(45,695
)
Other comprehensive (loss) income before reclassifications
(4,293
)
 
417

 
(2,461
)
 
3,298

 
(3,039
)
Amounts reclassified from other comprehensive (loss) income
(465
)
 
(539
)
 
7,641

 
4

 
6,641

Other comprehensive (loss) income, net
(4,758
)
 
(122
)
 
5,180

 
3,302

 
3,602

Balance-December 31, 2016
(10,094
)
 
(642
)
 
(12,464
)
 
(18,893
)
 
(42,093
)
Other comprehensive income (loss) before reclassifications
352

 
498

 
576

 
(2,722
)
 
(1,296
)
Amounts reclassified from other comprehensive income (loss)
11

 
(167
)
 
5,028

 
439

 
5,311

Other comprehensive income (loss), net
363

 
331

 
5,604

 
(2,283
)
 
4,015

Reclassification due to the adoption of ASU No. 2018-02
(2,273
)
 
(69
)
 
(1,478
)
 
(4,107
)
 
(7,927
)
Balance-December 31, 2017
$
(12,004
)
 
$
(380
)
 
$
(8,338
)
 
$
(25,283
)
 
$
(46,005
)