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Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2016
Equity [Abstract]  
Changes in other comprehensive income
The following table presents changes in other comprehensive income: 
 
Before-Tax Amount
 
Tax Effect
 
Net of Tax Amount
 
(in thousands)
Three months ended June 30, 2016
 
 
 
 
 
Unrealized gain on securities
$
19,753

 
$
(6,914
)
 
$
12,839

Reclassification adjustment for securities gains included in net income (1)
(76
)
 
27

 
(49
)
Amortization of unrealized loss on derivative financial instruments (2)
6

 
(2
)
 
4

Amortization of net unrecognized pension and postretirement items (3)
49

 
(17
)
 
32

Total Other Comprehensive Income
$
19,732

 
$
(6,906
)
 
$
12,826

Three months ended June 30, 2015
 
 
 
 
 
Unrealized loss on securities
$
(18,474
)
 
$
6,466

 
$
(12,008
)
Reclassification adjustment for securities gains included in net income (1)
(2,413
)
 
844

 
(1,569
)
Amortization of unrealized loss on derivative financial instruments(2)
52

 
(18
)
 
34

Amortization of net unrecognized pension and postretirement items (3)
717

 
(251
)
 
466

Total Other Comprehensive Loss
$
(20,118
)
 
$
7,041

 
$
(13,077
)
 
 
 
 
 
 
Six months ended June 30, 2016
 
 
 
 
 
Unrealized gain on securities
$
45,946

 
$
(16,081
)
 
$
29,865

Reclassification adjustment for securities gains included in net income (1)
(1,023
)
 
358

 
(665
)
Amortization of unrealized loss on derivative financial instruments (2)
12

 
(4
)
 
8

Amortization of net unrecognized pension and postretirement items (3)
766

 
(268
)
 
498

Total Other Comprehensive Income
$
45,701

 
$
(15,995
)
 
$
29,706

 
 
 
 
 
 
Six months ended June 30, 2015
 
 
 
 
 
Unrealized loss on securities
$
(3,103
)
 
$
1,087

 
$
(2,016
)
Reclassification adjustment for securities gains included in net income (1)
(6,558
)
 
2,294

 
(4,264
)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities
192

 
(67
)
 
125

Amortization of unrealized loss on derivative financial instruments (2)
104

 
(36
)
 
68

Amortization of net unrecognized pension and postretirement items (3)
1,434

 
(502
)
 
932

Total Other Comprehensive Loss
$
(7,931
)
 
$
2,776

 
$
(5,155
)


(1)
Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Investment securities gains, net" on the consolidated statements of income. See Note 4, "Investment Securities," for additional details.
(2)
Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Interest expense" on the consolidated statements of income.
(3)
Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Salaries and employee benefits" on the consolidated statements of income. See Note 8, "Employee Benefit Plans," for additional details.
Changes in each component of accumulated other comprehensive income
The following table presents changes in each component of accumulated other comprehensive income, net of tax: 
 
Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired
 
Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities
 
Unrealized Effective Portions of Losses on Forward-Starting Interest Rate Swaps
 
Unrecognized Pension and Postretirement Plan Income (Costs)
 
Total
 
(in thousands)
Three months ended June 30, 2016
 
 
 
 
 
 
 
 
 
Balance at March 31, 2016
$
9,911

 
$
458

 
$
(11
)
 
$
(15,495
)
 
$
(5,137
)
Other comprehensive income before reclassifications
12,839

 
—

 
—

 
—

 
12,839

Amounts reclassified from accumulated other comprehensive income (loss)
(49
)
 
—

 
4

 
32

 
(13
)
Balance at June 30, 2016
$
22,701

 
$
458

 
$
(7
)
 
$
(15,463
)
 
$
7,689

Three months ended June 30, 2015

 

 
 
 

 

Balance at March 31, 2015
$
14,311

 
$
440

 
$
(2,512
)
 
$
(22,039
)
 
$
(9,800
)
Other comprehensive income before reclassifications
(12,008
)

—

 
—

 
—

 
(12,008
)
Amounts reclassified from accumulated other comprehensive income (loss)
(1,473
)
 
(96
)
 
34

 
466

 
(1,069
)
Balance at June 30, 2015
$
830

 
$
344

 
$
(2,478
)
 
$
(21,573
)
 
$
(22,877
)
 
 
 
 
 
 
 
 
 
 
Six months ended June 30, 2016
 
 
 
 
 
 
 
 
 
Balance at December 31, 2015
$
(6,499
)
 
$
458

 
$
(15
)
 
$
(15,961
)
 
$
(22,017
)
Other comprehensive income before reclassifications
29,865

 
—

 
—

 
—

 
29,865

Amounts reclassified from accumulated other comprehensive income (loss)
(665
)
 
—

 
8

 
498

 
(159
)
Balance at June 30, 2016
$
22,701

 
$
458

 
$
(7
)
 
$
(15,463
)
 
$
7,689

Six months ended June 30, 2015
 
 
 
 
 
 
 
 
 
Balance at December 31, 2014
$
5,980

 
$
1,349

 
$
(2,546
)
 
$
(22,505
)
 
$
(17,722
)
Other comprehensive income before reclassifications
(2,016
)
 
125

 
—

 
—

 
(1,891
)
Amounts reclassified from accumulated other comprehensive income (loss)
(3,134
)
 
(1,130
)
 
68

 
932

 
(3,264
)
Balance at June 30, 2015
$
830

 
$
344

 
$
(2,478
)
 
$
(21,573
)
 
$
(22,877
)