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Accumulated Other Comprehensive Loss, Net of Tax (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Other Comprehensive Income (Loss) The following table summarizes the changes in AOCL by component:
(In thousands)
Available For Sale and Transferred Securities
Derivative Instruments
Defined Benefit Pension and Other Postretirement Benefit Plans
Total
Balance at December 31, 2014
$
16,421

$
(25,530
)
$
(47,152
)
$
(56,261
)
Other comprehensive (loss) income before reclassifications
(22,512
)
(3,136
)
(5,500
)
(31,148
)
Amounts reclassified from accumulated other comprehensive (loss) income
(316
)
5,686

3,933

9,303

Net current-period other comprehensive (loss) income, net of tax
(22,828
)
2,550

(1,567
)
(21,845
)
Balance at December 31, 2015
(6,407
)
(22,980
)
(48,719
)
(78,106
)
Other comprehensive (loss) income before reclassifications
(8,901
)
825

(232
)
(8,308
)
Amounts reclassified from accumulated other comprehensive (loss) income
(168
)
5,087

4,502

9,421

Net current-period other comprehensive (loss) income, net of tax
(9,069
)
5,912

4,270

1,113

Balance at December 31, 2016
(15,476
)
(17,068
)
(44,449
)
(76,993
)
Adoption of ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from AOCI
(4,881
)
(2,513
)
(8,254
)
(15,648
)
Other comprehensive (loss) income before reclassifications
(7,590
)
181

98

(7,311
)
Amounts reclassified from accumulated other comprehensive (loss) income
—

4,384

4,037

8,421

Net current-period other comprehensive (loss) income, net of tax
(7,590
)
4,565

4,135

1,110

Balance at December 31, 2017
$
(27,947
)
$
(15,016
)
$
(48,568
)
$
(91,531
)
Schedule of Accumulated Other Comprehensive Income (Loss) The following table provides information for the items reclassified from AOCL:
 
Years ended December 31,
 
Accumulated Other Comprehensive Loss Components
2017
 
2016
 
2015
Associated Line Item in the Consolidated Statements Of Income
(In thousands)
 
 
 
 
 
 
Available-for-sale and transferred securities:
 
 
 
 
 
 
Unrealized gains on investments
$
—

 
$
414

 
$
609

Gain on sale of investment securities, net
Unrealized losses on investments
—

 
(149
)
 
(110
)
Impairment loss recognized in earnings
Total before tax
—

 
265

 
499

 
Tax expense
—

 
(97
)
 
(183
)
Income tax expense
Net of tax
$
—

 
$
168

 
$
316

 
Derivative instruments:
 
 
 
 
 
 
Cash flow hedges
$
(7,160
)
 
$
(8,020
)
 
$
(8,965
)
Total interest expense
Tax benefit
2,776

 
2,933

 
3,279

Income tax expense
Net of tax
$
(4,384
)
 
$
(5,087
)
 
$
(5,686
)
 
Defined benefit pension and other postretirement benefit plans:
 
 
 
 
 
 
Amortization of net loss
$
(6,612
)
 
$
(7,126
)
 
$
(6,161
)
(1)
Prior service costs
—

 
(14
)
 
(73
)
(1)
Total before tax
(6,612
)
 
(7,140
)
 
(6,234
)
 
Tax benefit
2,575

 
2,638

 
2,301

Income tax expense
Net of tax
$
(4,037
)
 
$
(4,502
)
 
$
(3,933
)
 
(1) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost (see Note 17 Retirement Benefit Plans for further details).

The following tables summarize the items and related tax effects for each component of OCI/OCL, net of tax:
 
Year ended December 31, 2017
(In thousands)
Pre-Tax Amount
Tax Benefit (Expense)
Net of Tax Amount
Available-for-sale and transferred securities:
 
 
 
Net unrealized loss during the period
$
(12,423
)
$
4,833

$
(7,590
)
Reclassification for net gain included in net income
—

—

—

Net non-credit other-than-temporary impairment
—

—

—

Amortization of unrealized loss on securities transferred to held-to-maturity
—

—

—

Total available-for-sale and transferred securities
(12,423
)
4,833

(7,590
)
Derivative instruments:
 
 
 
Net unrealized gain during the period
291

(110
)
181

Reclassification adjustment for net loss included in net income
7,160

(2,776
)
4,384

Total derivative instruments
7,451

(2,886
)
4,565

Defined benefit pension and other postretirement benefit plans:
 
 
 
Current year actuarial loss
155

(57
)
98

Reclassification adjustment for amortization of net loss included in net income
6,612

(2,575
)
4,037

Reclassification adjustment for prior service cost included in net income
—

—

—

Total defined benefit pension and postretirement benefit plans
6,767

(2,632
)
4,135

Other comprehensive income, net of tax
$
1,795

$
(685
)
$
1,110

 
Year ended December 31, 2016
(In thousands)
Pre-Tax Amount
Tax Benefit (Expense)
Net of Tax Amount
Available-for-sale and transferred securities:
 
 
 
Net unrealized loss during the period
$
(14,113
)
$
5,212

$
(8,901
)
Reclassification for net gain included in net income
(414
)
152

(262
)
Net non-credit other-than-temporary impairment
149

(55
)
94

Amortization of unrealized loss on securities transferred to held-to-maturity
—

—

—

Total available-for-sale and transferred securities
(14,378
)
5,309

(9,069
)
Derivative instruments:
 
 
 
Net unrealized loss during the period
1,331

(506
)
825

Reclassification adjustment for net loss included in net income
8,020

(2,933
)
5,087

Total derivative instruments
9,351

(3,439
)
5,912

Defined benefit pension and other postretirement benefit plans:
 
 
 
Current year actuarial loss
(368
)
136

(232
)
Reclassification adjustment for amortization of net loss included in net income
7,126

(2,633
)
4,493

Reclassification adjustment for prior service cost included in net income
14

(5
)
9

Total defined benefit pension and postretirement benefit plans
6,772

(2,502
)
4,270

Other comprehensive loss, net of tax
$
1,745

$
(632
)
$
1,113

 
Year ended December 31, 2015
(In thousands)
Pre-Tax Amount
Tax Benefit (Expense)
Net of Tax Amount
Available-for-sale and transferred securities:
 
 
 
Net unrealized gain during the period
$
(35,701
)
$
13,166

$
(22,535
)
Reclassification for net gain included in net income
(609
)
223

(386
)
Net non-credit other-than-temporary impairment
110

(40
)
70

Amortization of unrealized loss on securities transferred to held-to-maturity
37

(14
)
23

Total available-for-sale and transferred securities
(36,163
)
13,335

(22,828
)
Derivative instruments:
 
 
 
Net unrealized loss during the period
(4,945
)
1,809

(3,136
)
Reclassification adjustment for net loss included in net income
8,965

(3,279
)
5,686

Total derivative instruments
4,020

(1,470
)
2,550

Defined benefit pension and other postretirement benefit plans:
 
 
 
Current year actuarial loss
(8,719
)
3,219

(5,500
)
Reclassification adjustment for amortization of net loss included in net income
6,161

(2,274
)
3,887

Reclassification adjustment for prior service cost included in net income
73

(27
)
46

Total defined benefit pension and postretirement benefit plans
(2,485
)
918

(1,567
)
Other comprehensive loss, net of tax
$
(34,628
)
$
12,783

$
(21,845
)