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Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 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 June 30, 2019
 
 
 
 
 
Unrealized gain on securities
$
31,994

 
$
(7,077
)
 
$
24,917

Reclassification adjustment for securities gains included in net income (1)
(176
)
 
39

 
(137
)
Amortization of net unrealized losses on available for sale ("AFS") securities transferred to held to maturity ("HTM") (2)
1,311

 
(290
)
 
1,021

Non-credit related unrealized losses on other-than-temporarily impaired debt securities
(770
)
 
170

 
(600
)
Amortization of net unrecognized pension and postretirement items (3)
353

 
(78
)
 
275

Total Other Comprehensive Income
$
32,712

 
$
(7,236
)
 
$
25,476

Three months ended June 30, 2018
 
 
 
 
 
Unrealized loss on securities
$
(8,397
)
 
$
1,766

 
$
(6,631
)
Reclassification adjustment for securities gains included in net income (1)
(4
)
 
1

 
(3
)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities
9

 
(1
)
 
8

Amortization of net unrecognized pension and postretirement items (3)
683

 
(143
)
 
540

Total Other Comprehensive Loss
$
(7,709
)
 
$
1,623

 
$
(6,086
)
 
 
 
 
 
 
Six months ended June 30, 2019
 
 
 
 
 
Unrealized gain on securities
$
58,056

 
$
(12,841
)
 
$
45,215

Reclassification adjustment for securities gains included in net income (1)
(241
)
 
53

 
(188
)
Amortization of net unrealized losses on AFS securities transferred to HTM (2)
2,563

 
(568
)
 
1,995

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

 
(682
)
Amortization of net unrecognized pension and postretirement items (3)
727

 
(161
)
 
566

Total Other Comprehensive Income
$
60,230

 
$
(13,324
)
 
$
46,906

 
 
 
 
 
 
Six months ended June 30, 2018
 
 
 
 
 
Unrealized loss on securities
$
(43,388
)
 
$
9,113

 
$
(34,275
)
Reclassification adjustment for securities gains included in net income (1)
(23
)
 
4

 
(19
)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities
294

 
(62
)
 
232

Amortization of net unrecognized pension and postretirement items (3)
1,113

 
(234
)
 
879

Total Other Comprehensive Loss
$
(42,004
)
 
$
8,821

 
$
(33,183
)


(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)
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 June 30, 2019
 
 
 
 
 
 
 
Balance at March 31, 2019
$
(23,433
)
 
$
598

 
$
(14,798
)
 
$
(37,633
)
Other comprehensive income before reclassifications
24,917

 
(600
)
 
—

 
24,317

Amounts reclassified from accumulated other comprehensive income (loss)
(137
)
 
—

 
275

 
138

Amortization of net unrealized losses on AFS securities transferred to HTM
1,021

—

—

 
—

 
1,021

Balance at June 30, 2019
$
2,368

 
$
(2
)
 
$
(14,523
)
 
$
(12,157
)
Three months ended June 30, 2018

 

 

 

Balance at March 31, 2018
$
(50,056
)
 
$
682

 
$
(17,798
)
 
$
(67,172
)
Other comprehensive loss before reclassifications
(6,631
)


8

 
—

 
(6,623
)
Amounts reclassified from accumulated other comprehensive income (loss)
(3
)
 
—

 
540

 
537

Balance at June 30, 2018
$
(56,690
)
 
$
690

 
$
(17,258
)
 
$
(73,258
)
 
 
 
 
 
 
 
 
Six months ended June 30, 2019
 
 
 
 
 
 
 
Balance at December 31, 2018
$
(44,654
)
 
$
680

 
$
(15,089
)
 
$
(59,063
)
Other comprehensive income before reclassifications
45,215

 
(682
)
 
—

 
44,533

Amounts reclassified from accumulated other comprehensive income (loss)
(188
)
 
—

 
566

 
378

Amortization of net unrealized losses on AFS securities transferred to HTM
1,995

 
—

 
—

 
1,995

Balance at June 30, 2019
$
2,368

 
$
(2
)
 
$
(14,523
)
 
$
(12,157
)
Six months ended June 30, 2018
 
 
 
 
 
 
 
Balance at December 31, 2017
$
(18,509
)
 
$
458

 
$
(14,923
)
 
$
(32,974
)
Other comprehensive loss before reclassifications
(34,275
)
 
232

 
—

 
(34,043
)
Amounts reclassified from accumulated other comprehensive income (loss)
(19
)
 
—

 
879

 
860

Reclassification of stranded tax effects
(3,887
)
 
—

 
(3,214
)
 
(7,101
)
Balance at June 30, 2018
$
(56,690
)
 
$
690

 
$
(17,258
)
 
$
(73,258
)