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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014. 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. 
 
2016
 
2015
 
2014
 
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 (losses) gains arising during the period
$
(7,294
)
 
$
3,001

 
$
(4,293
)
 
$
(3,458
)
 
$
1,458

 
$
(2,000
)
 
$
33,329

 
$
(13,931
)
 
$
19,398

Less reclassification adjustment for net gains included in net income (1)
(777
)
 
312

 
(465
)
 
(2,487
)
 
1,041

 
(1,446
)
 
(745
)
 
312

 
(433
)
Net change
(8,071
)
 
3,313

 
(4,758
)
 
(5,945
)
 
2,499

 
(3,446
)
 
32,584

 
(13,619
)
 
18,965

Non-credit impairment losses on securities available for sale and held to maturity 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net change in non-credit impairment losses on securities
719

 
(302
)
 
417

 
(416
)
 
175

 
(241
)
 
2,299

 
(965
)
 
1,334

Less reclassification adjustment for accretion of credit impairment losses included in net income (2)
(921
)
 
382

 
(539
)
 
(728
)
 
304

 
(424
)
 
(661
)
 
278

 
(383
)
Net change
(202
)
 
80

 
(122
)
 
(1,144
)
 
479

 
(665
)
 
1,638

 
(687
)
 
951

Unrealized gains and losses on derivatives (cash flow hedges)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net (losses) gains arising during the period
(4,035
)
 
1,574

 
(2,461
)
 
(12,360
)
 
5,121

 
(7,239
)
 
(20,910
)
 
8,763

 
(12,147
)
Less reclassification adjustment for net losses included in net income (3)
13,034

 
(5,393
)
 
7,641

 
7,075

 
(2,948
)
 
4,127

 
6,663

 
(2,777
)
 
3,886

Net change
8,999

 
(3,819
)
 
5,180

 
(5,285
)
 
2,173

 
(3,112
)
 
(14,247
)
 
5,986

 
(8,261
)
Defined benefit pension plan
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net gains (losses) arising during the period
5,837

 
(2,539
)
 
3,298

 
6,030

 
(2,586
)
 
3,444

 
(27,902
)
 
11,695

 
(16,207
)
Amortization of prior service cost (4)
(300
)
 
119

 
(181
)
 
206

 
(89
)
 
117

 
305

 
(128
)
 
177

Amortization of net loss (4)
294

 
(109
)
 
185

 
790

 
(328
)
 
462

 
226

 
(94
)
 
132

Net change
5,831

 
(2,529
)
 
3,302

 
7,026

 
(3,003
)
 
4,023

 
(27,371
)
 
11,473

 
(15,898
)
Total other comprehensive income (loss)
$
6,557

 
$
(2,955
)
 
$
3,602

 
$
(5,348
)
 
$
2,148

 
$
(3,200
)
 
$
(7,396
)
 
$
3,153

 
$
(4,243
)

 
(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, 2016, 2015 and 2014: 
 
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, 2013
$
(20,855
)
 
$
(806
)
 
$
(6,271
)
 
$
(10,320
)
 
$
(38,252
)
Other comprehensive income (loss) before reclassifications
19,398

 
1,334

 
(12,147
)
 
(16,207
)
 
(7,622
)
Amounts reclassified from other comprehensive income (loss)
(433
)
 
(383
)
 
3,886

 
309

 
3,379

Other comprehensive income (loss), net
18,965

 
951

 
(8,261
)
 
(15,898
)
 
(4,243
)
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
)