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Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2018
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, 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 (2)
683

 
(143
)
 
540

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

 
$
(6,086
)
Three months ended June 30, 2017
 
 
 
 
 
Unrealized gain on securities
$
15,798

 
$
(5,530
)
 
$
10,268

Reclassification adjustment for securities gains included in net income (1)
(1,436
)
 
504

 
(932
)
Amortization of net unrecognized pension and postretirement items (2)
522

 
(181
)
 
341

Total Other Comprehensive Income
$
14,884

 
$
(5,207
)
 
$
9,677

 
 
 
 
 
 
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 (2)
1,113

 
(234
)
 
879

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

 
$
(33,183
)
 
 
 
 
 
 
Six months ended June 30, 2017
 
 
 
 
 
Unrealized gain on securities
$
22,374

 
$
(7,833
)
 
$
14,541

Reclassification adjustment for securities gains included in net income (1)
(2,542
)
 
891

 
(1,651
)
Amortization of net unrecognized pension and postretirement items (2)
1,051

 
(367
)
 
684

Total Other Comprehensive Income
$
20,883

 
$
(7,309
)
 
$
13,574



(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 "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 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
)
Three months ended June 30, 2017

 

 

 

Balance at March 31, 2017
$
(19,493
)
 
$
273

 
$
(15,332
)
 
$
(34,552
)
Other comprehensive income before reclassifications
10,268


—

 
—

 
10,268

Amounts reclassified from accumulated other comprehensive income (loss)
(932
)
 
—

 
341

 
(591
)
Balance at June 30, 2017
$
(10,157
)
 
$
273

 
$
(14,991
)
 
$
(24,875
)
 
 
 
 
 
 
 
 
Six months ended June 30, 2018
 
 
 
 
 
 
 
Balance at December 31, 2017
$
(18,509
)
 
$
458

 
$
(14,923
)
 
$
(32,974
)
Other comprehensive income 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
)
Six months ended June 30, 2017
 
 
 
 
 
 
 
Balance at December 31, 2016
$
(23,047
)
 
$
273

 
$
(15,675
)
 
$
(38,449
)
Other comprehensive income before reclassifications
14,541

 
—

 
—

 
14,541

Amounts reclassified from accumulated other comprehensive income (loss)
(1,651
)
 
—

 
684

 
(967
)
Balance at June 30, 2017
$
(10,157
)
 
$
273

 
$
(14,991
)
 
$
(24,875
)