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Accumulated Other Comprehensive Income
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Accumulated Other Comprehensive Income
Accumulated 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 March 31, 2018
 
 
 
 
 
Unrealized loss on securities
$
(34,991
)
 
$
7,347

 
$
(27,644
)
Reclassification adjustment for securities gains included in net income (1)
(19
)
 
3

 
(16
)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities
285

 
(61
)
 
224

Amortization of net unrecognized pension and postretirement items (2)
430

 
(91
)
 
339

Total Other Comprehensive Loss
$
(34,295
)
 
$
7,198

 
$
(27,097
)
Three months ended March 31, 2017
 
 
 
 
 
Unrealized gain on securities
$
6,575

 
$
(2,302
)
 
$
4,273

Reclassification adjustment for securities gains included in net income (1)
(1,106
)
 
387

 
(719
)
Amortization of net unrecognized pension and postretirement items (2)
528

 
(185
)
 
343

Total Other Comprehensive Income
$
5,997

 
$
(2,100
)
 
$
3,897



(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.
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 March 31, 2018
 
 
 
 
 
 
 
Balance at December 31, 2017
$
(18,509
)
 
$
458

 
$
(14,923
)
 
$
(32,974
)
Other comprehensive loss before reclassifications
(27,644
)
 
224

 
—

 
(27,420
)
Amounts reclassified from accumulated other comprehensive income (loss)
(16
)
 
—

 
339

 
323

Reclassification of stranded tax effects
(3,887
)
 
—

 
(3,214
)
 
(7,101
)
Balance at March 31, 2018
$
(50,056
)
 
$
682

 
$
(17,798
)
 
$
(67,172
)
Three months ended March 31, 2017

 

 

 

Balance at December 31, 2016
$
(23,047
)
 
$
273

 
$
(15,675
)
 
$
(38,449
)
Other comprehensive income before reclassifications
4,273


—

 
—

 
4,273

Amounts reclassified from accumulated other comprehensive income (loss)
(719
)
 
—

 
343

 
(376
)
Balance at March 31, 2017
$
(19,493
)
 
$
273

 
$
(15,332
)
 
$
(34,552
)