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Comprehensive Income
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Comprehensive Income
Comprehensive Income
Comprehensive income is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances arising from nonowner sources. The following summarizes the change in the components of other comprehensive income.
 
Three Months Ended March 31,
 
2018
 
2017
 
Pretax
 
Tax Expense/ (Benefit)
 
After-tax
 
Pretax
 
Tax Expense/ (Benefit)
 
After-tax
 
(In Thousands)
Other comprehensive income:
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding (losses) gains arising during period from debt securities available for sale
$
(54,845
)
 
$
(12,986
)
 
$
(41,859
)
 
$
42,751

 
$
15,818

 
$
26,933

Less: reclassification adjustment for net gains on sale of debt securities in net income
—

 
—

 
—

 
—

 
—

 
—

Net change in unrealized (losses) gains on debt securities available for sale
(54,845
)
 
(12,986
)
 
(41,859
)
 
42,751

 
15,818

 
26,933

Change in unamortized net holding losses on debt securities held to maturity
2,639

 
620

 
2,019

 
1,058

 
392

 
666

Unamortized unrealized net holding losses on debt securities available for sale transferred to debt securities held to maturity
(39,904
)
 
(9,417
)
 
(30,487
)
 
—

 
—

 
—

Less: non-credit related impairment on debt securities held to maturity
262

 
62

 
200

 
—

 
—

 
—

Change in unamortized non-credit related impairment on debt securities held to maturity
171

 
41

 
130

 
354

 
131

 
223

Net change in unamortized holding losses on debt securities held to maturity
(37,356
)
 
(8,818
)
 
(28,538
)
 
1,412

 
523

 
889

Unrealized holding losses arising during period from cash flow hedge instruments
(87
)
 
150

 
(237
)
 
(15,686
)
 
(5,820
)
 
(9,866
)
Change in defined benefit plans
(4,425
)
 
(1,046
)
 
(3,379
)
 
(773
)
 
(288
)
 
(485
)
Other comprehensive (loss) income
$
(96,713
)
 
$
(22,700
)
 
$
(74,013
)
 
$
27,704

 
$
10,233

 
$
17,471


Activity in accumulated other comprehensive income (loss), net of tax was as follows:
 
Unrealized Gains (Losses) on Debt Securities Available for Sale and Transferred to Held to Maturity
 
Accumulated Gains (Losses) on Cash Flow Hedging Instruments
 
Defined Benefit Plan Adjustment
 
Unamortized Impairment Losses on Debt Securities Held to Maturity
 
Total
 
(In Thousands)
Balance, December 31, 2016
$
(119,562
)
 
$
(10,080
)
 
$
(32,028
)
 
$
(6,582
)
 
$
(168,252
)
Other comprehensive income (loss) before reclassifications
26,933

 
(6,285
)
 
—

 
—

 
20,648

Amounts reclassified from accumulated other comprehensive income (loss)
666

 
(3,581
)
 
(485
)
 
223

 
(3,177
)
Net current period other comprehensive income (loss)
27,599

 
(9,866
)
 
(485
)
 
223

 
17,471

Balance, March 31, 2017
$
(91,963
)
 
$
(19,946
)
 
$
(32,513
)
 
$
(6,359
)
 
$
(150,781
)
 
 
 
 
 
 
 
 
 
 
Balance, December 31, 2017
$
(132,821
)
 
$
(24,765
)
 
$
(34,228
)
 
$
(5,591
)
 
$
(197,405
)
Other comprehensive loss before reclassifications
(72,346
)
 
(7,407
)
 
—

 
(200
)
 
(79,953
)
Cumulative effect of adoption of ASU 2016-01
(13
)
 
—

 
—

 
—

 
(13
)
Amounts reclassified from accumulated other comprehensive income (loss)
2,019

 
7,170

 
(3,379
)
 
130

 
5,940

Net current period other comprehensive loss
(70,340
)
 
(237
)
 
(3,379
)
 
(70
)
 
(74,026
)
Balance, March 31, 2018
$
(203,161
)
 
$
(25,002
)
 
$
(37,607
)
 
$
(5,661
)
 
$
(271,431
)

The following table presents information on reclassifications out of accumulated other comprehensive income (loss).
Details About Accumulated Other Comprehensive Income (Loss) Components
 
Amounts Reclassified From Accumulated Other Comprehensive Income (Loss)  (1)
 
Condensed Consolidated Statement of Income Caption
 
 
Three Months Ended March 31,
 
 
 
 
2018
 
2017
 
 
 
 
(In Thousands)
 
 
Unrealized Gains (Losses) on Debt Securities Available for Sale and Transferred to Held to Maturity
 
$
(2,639
)
 
$
(1,058
)
 
Interest on debt securities held to maturity
 
 
620

 
392

 
Income tax benefit
 
 
$
(2,019
)
 
$
(666
)
 
Net of tax
 
 
 
 
 
 
 
Accumulated Gains (Losses) on Cash Flow Hedging Instruments
 
$
(8,890
)
 
$
6,374

 
Interest and fees on loans
 
 
(495
)
 
(680
)
 
Interest and fees on FHLB advances
 
 
(9,385
)
 
5,694

 
 
 
 
2,215

 
(2,113
)
 
Income tax (expense) benefit
 
 
$
(7,170
)
 
$
3,581

 
Net of tax
 
 
 
 
 
 
 
Defined Benefit Plan Adjustment
 
$
4,425

 
$
773

 
(2)
 
 
(1,046
)
 
(288
)
 
Income tax expense
 
 
$
3,379

 
$
485

 
Net of tax
 
 
 
 
 
 
 
Unamortized Impairment Losses on Debt Securities Held to Maturity
 
$
(171
)
 
$
(354
)
 
Interest on debt securities held to maturity
 
 
41

 
131

 
Income tax benefit
 
 
$
(130
)
 
$
(223
)
 
Net of tax
(1)
Amounts in parentheses indicate debits to the Unaudited Condensed Consolidated Statements of Income.
(2)
These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 18, Benefit Plans, in the Notes to the December 31, 2017, Consolidated Financial Statements for additional details).