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Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2016
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,
 
2016
 
2015
 
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
$
107,725

 
$
39,461

 
$
68,264

 
$
64,790

 
$
28,202

 
$
36,588

Less: reclassification adjustment for net gains on sale of securities in net income
8,353

 
3,059

 
5,294

 
32,832

 
14,292

 
18,540

Net change in unrealized gains on securities available for sale
99,372

 
36,402

 
62,970

 
31,958

 
13,910

 
18,048

Change in unamortized net holding losses on investment securities held to maturity
835

 
306

 
529

 
3,142

 
1,368

 
1,774

Less: non-credit related impairment on investment securities held to maturity
—

 
—

 
—

 
87

 
38

 
49

Change in unamortized non-credit related impairment on investment securities held to maturity
351

 
129

 
222

 
276

 
120

 
156

Net change in unamortized holding losses on securities held to maturity
1,186

 
435

 
751

 
3,331

 
1,450

 
1,881

Unrealized holding gains arising during period from cash flow hedge instruments
4,275

 
1,566

 
2,709

 
3,646

 
1,587

 
2,059

Change in defined benefit plans
1,300

 
369

 
931

 
2,716

 
1,001

 
1,715

Other comprehensive income
$
106,133

 
$
38,772

 
$
67,361

 
$
41,651

 
$
17,948

 
$
23,703
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, January 1, 2015
$
4,469

 
$
(7,189
)
 
$
(41,121
)
 
$
(7,516
)
 
$
(51,357
)
Other comprehensive income (loss) before reclassifications
36,588

 
2,650

 
—

 
(49
)
 
39,189

Amounts reclassified from accumulated other comprehensive income (loss)
(16,766
)
 
(591
)
 
1,715

 
156

 
(15,486
)
Net current period other comprehensive income
19,822

 
2,059

 
1,715

 
107

 
23,703

Balance, March 31, 2015
$
24,291

 
$
(5,130
)
 
$
(39,406
)
 
$
(7,409
)
 
$
(27,654
)
 
 
 
 
 
 
 
 
 
 
Balance, January 1, 2016
$
(56,326
)
 
$
(6,378
)
 
$
(29,166
)
 
$
(7,437
)
 
$
(99,307
)
Other comprehensive income before reclassifications
68,264

 
3,038

 
—

 
—

 
71,302

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

 
222

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

 
2,709

 
931

 
222

 
67,361

Balance, March 31, 2016
$
7,173

 
$
(3,669
)
 
$
(28,235
)
 
$
(7,215
)
 
$
(31,946
)
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,
 
 
 
 
2016
 
2015
 
 
 
 
(In Thousands)
 
 
Unrealized Gains on Securities Available for Sale and Transferred to Held to Maturity
 
$
8,353

 
$
32,832

 
Investment securities gains, net
 
 
(835
)
 
(3,142
)
 
Interest on investment securities held to maturity
 
 
7,518

 
29,690

 
 
 
 
(2,753
)
 
(12,924
)
 
Income tax expense
 
 
$
4,765

 
$
16,766

 
Net of tax
 
 
 
 
 
 
 
Accumulated Gains (Losses) on Cash Flow Hedging Instruments
 
$
2,048

 
$
2,813

 
Interest and fees on loans
 
 
(1,529
)
 
(1,766
)
 
Interest and fees on FHLB advances
 
 
519

 
1,047

 
 
 
 
(190
)
 
(456
)
 
Income tax expense
 
 
$
329

 
$
591

 
Net of tax
 
 
 
 
 
 
 
Defined Benefit Plan Adjustment
 
$
(1,300
)
 
$
(2,716
)
 
(2)
 
 
369

 
1,001

 
Income tax benefit
 
 
$
(931
)
 
$
(1,715
)
 
Net of tax
 
 
 
 
 
 
 
Unamortized Impairment Losses on Investment Securities Held to Maturity
 
$
(351
)
 
$
(276
)
 
Interest on investment securities held to maturity
 
 
129

 
120

 
Income tax benefit
 
 
$
(222
)
 
$
(156
)
 
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, 2015, Consolidated Financial Statements for additional details).