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Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Change in components of other comprehensive income (loss)
The following summarizes the change in the components of other comprehensive income.
 
Three Months Ended March 31,
 
2017
 
2016
 
Pretax
 
Tax Expense/ (Benefit)
 
After-tax
 
Pretax
 
Tax Expense/ (Benefit)
 
After-tax
 
(In Thousands)
Other comprehensive income:
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding gains arising during period from securities available for sale
$
42,751

 
$
15,818

 
$
26,933

 
$
107,725

 
$
39,461

 
$
68,264

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

 
—

 
—

 
8,353

 
3,059

 
5,294

Net change in unrealized gains on securities available for sale
42,751

 
15,818

 
26,933

 
99,372

 
36,402

 
62,970

Change in unamortized net holding losses on investment securities held to maturity
1,058

 
392

 
666

 
835

 
306

 
529

Change in unamortized non-credit related impairment on investment securities held to maturity
354

 
131

 
223

 
351

 
129

 
222

Net change in unamortized holding losses on securities held to maturity
1,412

 
523

 
889

 
1,186

 
435

 
751

Unrealized holding gains (losses) arising during period from cash flow hedge instruments
(15,686
)
 
(5,820
)
 
(9,866
)
 
4,305

 
1,566

 
2,739

Change in defined benefit plans
(773
)
 
(288
)
 
(485
)
 
1,300

 
369

 
931

Other comprehensive income
$
27,704

 
$
10,233

 
$
17,471

 
$
106,163

 
$
38,772

 
$
67,391
Schedule of accumulated other comprehensive income (loss)
Activity in accumulated other comprehensive income (loss), net of tax was as follows:
 
Unrealized Gains (Losses) on 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 Investment Securities Held to Maturity
 
Total
 
(In Thousands)
Balance, December 31, 2015
$
(56,326
)
 
$
(6,407
)
 
$
(29,166
)
 
$
(7,437
)
 
$
(99,336
)
Other comprehensive income before reclassifications
68,264

 
3,068

 
—

 
—

 
71,332

Amounts reclassified from accumulated other comprehensive income (loss)
(4,765
)
 
(329
)
 
931

 
222

 
(3,941
)
Net current period other comprehensive income
63,499

 
2,739

 
931

 
222

 
67,391

Balance, March 31, 2016
$
7,173

 
$
(3,668
)
 
$
(28,235
)
 
$
(7,215
)
 
$
(31,945
)
 
 
 
 
 
 
 
 
 
 
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
27,599

 
(9,866
)
 
(485
)
 
223

 
17,471

Balance, March 31, 2017
$
(91,963
)
 
$
(19,946
)
 
$
(32,513
)
 
$
(6,359
)
 
$
(150,781
)
Schedule of reclassifications out of accumulated other comprehensive income
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,
 
 
 
 
2017
 
2016
 
 
 
 
(In Thousands)
 
 
Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity
 
$
—

 
$
8,353

 
Investment securities gains, net
 
 
(1,058
)
 
(835
)
 
Interest on investment securities held to maturity
 
 
(1,058
)
 
7,518

 
 
 
 
392

 
(2,753
)
 
Income tax (expense) benefit
 
 
$
(666
)
 
$
4,765

 
Net of tax
 
 
 
 
 
 
 
Accumulated Gains (Losses) on Cash Flow Hedging Instruments
 
$
6,374

 
$
2,048

 
Interest and fees on loans
 
 
(680
)
 
(1,529
)
 
Interest and fees on FHLB advances
 
 
5,694

 
519

 
 
 
 
(2,113
)
 
(190
)
 
Income tax expense
 
 
$
3,581

 
$
329

 
Net of tax
 
 
 
 
 
 
 
Defined Benefit Plan Adjustment
 
$
773

 
$
(1,300
)
 
(2)
 
 
(288
)
 
369

 
Income tax (expense) benefit
 
 
$
485

 
$
(931
)
 
Net of tax
 
 
 
 
 
 
 
Unamortized Impairment Losses on Investment Securities Held to Maturity
 
$
(354
)
 
$
(351
)
 
Interest on investment securities held to maturity
 
 
131

 
129

 
Income tax benefit
 
 
$
(223
)
 
$
(222
)
 
Net of tax
(1)
Amounts in parentheses indicate debits to the consolidated statement of income.
(2)
These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 19, Benefit Plans, in the Notes to the December 31, 2016, Consolidated Financial Statements for additional details).