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Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Changes in other comprehensive income
The following table presents changes in other comprehensive (loss) income:
 
Before-Tax Amount
 
Tax Effect
 
Net of Tax Amount
 
(in thousands)
Three months ended September 30, 2018
 
 
 
 
 
Unrealized loss on securities
$
(15,865
)
 
$
3,334

 
$
(12,531
)
Reclassification adjustment for securities gains included in net income (1)
(14
)
 
3

 
(11
)
Amortization of net unrealized losses on AFS securities transferred to HTM (2)
1,000

 
(209
)
 
791

Amortization of net unrecognized pension and postretirement items (3)
466

 
(97
)
 
369

Total Other Comprehensive Loss
$
(14,413
)
 
$
3,031

 
$
(11,382
)
Three months ended September 30, 2017
 
 
 
 
 
Unrealized gain on securities
$
5,109

 
$
(1,789
)
 
$
3,320

Reclassification adjustment for securities gains included in net income (1)
(4,597
)
 
1,609

 
(2,988
)
Amortization of net unrecognized pension and postretirement items (3)
523

 
(183
)
 
340

Total Other Comprehensive Income
$
1,035

 
$
(363
)
 
$
672

 
 
 
 
 
 
Nine months ended September 30, 2018
 
 
 
 
 
Unrealized loss on securities
$
(59,250
)
 
$
12,444

 
$
(46,806
)
Reclassification adjustment for securities gains included in net income (1)
(37
)
 
7

 
(30
)
Amortization of net unrealized losses on AFS securities transferred to HTM (2)
1,000

 
(209
)
 
791

Non-credit related unrealized gains on other-than-temporarily impaired debt securities
294

 
(62
)
 
232

Amortization of net unrecognized pension and postretirement items (3)
1,580

 
(332
)
 
1,248

Total Other Comprehensive Loss
$
(56,413
)
 
$
11,848

 
$
(44,565
)
 
 
 
 
 
 
Nine months ended September 30, 2017
 
 
 
 
 
Unrealized gain on securities
$
27,482

 
$
(9,621
)
 
$
17,861

Reclassification adjustment for securities gains included in net income (1)
(7,139
)
 
2,500

 
(4,639
)
Amortization of net unrecognized pension and postretirement items (3)
1,575

 
(551
)
 
1,024

Total Other Comprehensive Income
$
21,918

 
$
(7,672
)
 
$
14,246



(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 as a reduction to "Interest Income" on the consolidated statements of income. See Note 4, "Investment Securities," for additional details.
(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 (loss), 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
 
Unrecognized Pension and Postretirement Plan Income (Costs)
 
Total
 
(in thousands)
Three months ended September 30, 2018
 
 
 
 
 
 
 
Balance at June 30, 2018
$
(56,690
)
 
$
690

 
$
(17,258
)
 
$
(73,258
)
Other comprehensive loss before reclassifications
(12,531
)
 
—

 
—

 
(12,531
)
Amounts reclassified from accumulated other comprehensive income (loss)
(11
)
 
—

 
369

 
358

Amortization of net unrealized losses on AFS securities transferred to HTM
791

 
—

 
—

 
791

Balance at September 30, 2018
$
(68,441
)
 
$
690

 
$
(16,889
)
 
$
(84,640
)
Three months ended September 30, 2017

 

 

 

Balance at June 30, 2017
$
(10,157
)
 
$
273

 
$
(14,991
)
 
$
(24,875
)
Other comprehensive income before reclassifications
3,320


—

 
—

 
3,320

Amounts reclassified from accumulated other comprehensive income (loss)
(2,988
)
 
—

 
340

 
(2,648
)
Balance at September 30, 2017
$
(9,825
)
 
$
273

 
$
(14,651
)
 
$
(24,203
)
 
 
 
 
 
 
 
 
Nine months ended September 30, 2018
 
 
 
 
 
 
 
Balance at December 31, 2017
$
(18,509
)
 
$
458

 
$
(14,923
)
 
$
(32,974
)
Other comprehensive income before reclassifications
(46,806
)
 
232

 
—

 
(46,574
)
Amounts reclassified from accumulated other comprehensive income (loss)
(30
)
 
—

 
1,248

 
1,218

Amortization of net unrealized losses on AFS securities transferred to HTM
791

 
—

 
—

 
791

Reclassification of stranded tax effects
(3,887
)
 
—

 
(3,214
)
 
(7,101
)
Balance at September 30, 2018
$
(68,441
)
 
$
690

 
$
(16,889
)
 
$
(84,640
)
Nine months ended September 30, 2017
 
 
 
 
 
 
 
Balance at December 31, 2016
$
(23,047
)
 
$
273

 
$
(15,675
)
 
$
(38,449
)
Other comprehensive income before reclassifications
17,861

 
—

 
—

 
17,861

Amounts reclassified from accumulated other comprehensive income (loss)
(4,639
)
 
—

 
1,024

 
(3,615
)
Balance at September 30, 2017
$
(9,825
)
 
$
273

 
$
(14,651
)
 
$
(24,203
)