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Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Changes in other comprehensive income

The following table presents changes in other comprehensive income (loss):
 
Before-Tax Amount
 
Tax Effect
 
Net of Tax Amount
 
(in thousands)
Three months ended September 30, 2019
 
 
 
 
 
Unrealized gain on securities (3)
$
23,150

 
$
(5,121
)
 
$
18,029

Reclassification adjustment for securities gains included in net income (1)
(4,492
)
 
994

 
(3,498
)
Amortization of net unrealized losses on AFS securities transferred to held to maturity ("HTM") (2) (3)
4,405

 
(974
)
 
3,430

Amortization of net unrecognized pension and postretirement items (4)
357

 
(80
)
 
277

Total Other Comprehensive Income
$
23,419

 
$
(5,181
)
 
$
18,238

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 (4)
466

 
(97
)
 
369

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

 
$
(11,382
)
 
 
 
 
 
 
Nine months ended September 30, 2019
 
 
 
 
 
Unrealized gain on securities (3)
$
81,207

 
$
(17,963
)
 
$
63,244

Reclassification adjustment for securities gains included in net income (1)
(4,733
)
 
1,047

 
(3,686
)
Amortization of net unrealized losses on AFS securities transferred to HTM (2) (3)
6,966

 
(1,541
)
 
5,425

Non-credit related unrealized losses on other-than-temporarily impaired debt securities
(875
)
 
193

 
(682
)
Amortization of net unrecognized pension and postretirement items (4)
1,083

 
(240
)
 
843

Total Other Comprehensive Income
$
83,648

 
$
(18,504
)
 
$
65,144

 
 
 
 
 
 
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 (4)
1,580

 
(332
)
 
1,248

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

 
$
(44,565
)


(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 3, "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.
(3)
Before-Tax amount includes a $3.7 million reclassification of unrealized loss related to the early adoption of ASU 2019-04, as disclosed in "Note 1 - Basis of Presentation" from "Amortization of net unrealized losses on AFS securities transferred to HTM" to "Unrealized gain on securities."
(4)
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 13, "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, 2019
 
 
 
 
 
 
 
Balance at June 30, 2019
$
2,368

 
$
(2
)
 
$
(14,523
)
 
$
(12,157
)
Other comprehensive income before reclassifications
18,029

 
—

 
—

 
18,029

Amounts reclassified from accumulated other comprehensive income (loss)
(3,498
)
 
—

 
277

 
(3,221
)
Amortization of net unrealized losses on AFS securities transferred to HTM
3,430

—

—

 
—

 
3,430

Balance at September 30, 2019
$
20,329

 
$
(2
)
 
$
(14,246
)
 
$
6,081

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
)
 
 
 
 
 
 
 
 
Nine months ended September 30, 2019
 
 
 
 
 
 
 
Balance at December 31, 2018
$
(44,654
)
 
$
680

 
$
(15,089
)
 
$
(59,063
)
Other comprehensive income before reclassifications
63,244

 
(682
)
 
—

 
62,562

Amounts reclassified from accumulated other comprehensive income (loss)
(3,686
)
 
—

 
843

 
(2,843
)
Amortization of net unrealized losses on AFS securities transferred to HTM
5,425

 
—

 
—

 
5,425

Balance at September 30, 2019
$
20,329

 
$
(2
)
 
$
(14,246
)
 
$
6,081

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

 
$
(14,923
)
 
$
(32,974
)
Other comprehensive loss 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
)