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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of changes in accumulated other comprehensive income (loss) by component, including amounts reclassified to other comprehensive income (loss) and the related line item in the Statements of Operations where net income is presented
Changes in accumulated other comprehensive income ("AOCI") (loss) by component, including amounts reclassified to other comprehensive income ("OCI") (loss) and the related line item in the Statements of Operations where net income is presented, are as follows for the year ended December 31:
(in thousands)
 
2017
 
2016
 
2015
 
 
Before Tax
Income Tax
Net
 
Before Tax
Income Tax
Net
 
Before Tax
Income Tax
Net
Investment securities:
 
 
 
 
 
 
 
 
 
 
 
 
AOCI, beginning of year
 
$
3,954

$
1,384

$
2,570

 
$
3,888

$
1,361

$
2,527

 
$
10,473

$
3,666

$
6,807

OCI (loss) before reclassifications - pre TCJA (1)
 
(648
)
(227
)
(421
)
 
(385
)
(135
)
(250
)
 
(7,651
)
(2,678
)
(4,973
)
OCI before reclassifications - post TCJA (1)
 
1,162

243

919

 
—

—

—

 
—

—

—

Realized investment (gains) losses
 
(1,240
)
(434
)
(806
)
 
35

12

23

 
(492
)
(172
)
(320
)
Impairment losses
 
182

64

118

 
416

146

270

 
1,558

545

1,013

OCI (loss)
 
(544
)
(354
)
(190
)
 
66

23

43

 
(6,585
)
(2,305
)
(4,280
)
Reclassification adjustment (2)
 
—

(314
)
314

 
—

—

—

 
—

—

—

AOCI, end of year
 
$
3,410

$
716

$
2,694

 
$
3,954

$
1,384

$
2,570

 
$
3,888

$
1,361

$
2,527

 
 
 
 
 
 
 
 
 
 
 
 
 
Pension and other postretirement plans:
 
 
 
 
 
 
 
 
 
 
 
 
AOCI (loss), beginning of year
 
$
(190,695
)
$
(66,744
)
$
(123,951
)
 
$
(152,910
)
$
(53,519
)
$
(99,391
)
 
$
(191,552
)
$
(67,044
)
$
(124,508
)
OCI (loss) before reclassifications
 
(20,314
)
(7,111
)
(13,203
)
 
(46,244
)
$
(16,185
)
(30,059
)
 
24,094

8,433

15,661

Amortization of prior service costs (3)
 
871

306

565

 
695

243

452

 
668

234

434

Amortization of net actuarial loss (3)
 
8,882

3,109

5,773

 
7,764

2,717

5,047

 
13,880

4,858

9,022

Settlement loss (3)
 
302

106

196

 
—

—

—

 
—

—

—

Impact of change in tax rate (4)
 
—

1,436

(1,436
)
 
—

—

—

 
—

—

—

OCI (loss)
 
(10,259
)
(2,154
)
(8,105
)
 
(37,785
)
(13,225
)
(24,560
)
 
38,642

13,525

25,117

Reclassification adjustment (2)
 
—

26,697

(26,697
)
 
—

—

—

 
—

—

—

AOCI (loss), end of year
 
$
(200,954
)
$
(42,201
)
$
(158,753
)
 
$
(190,695
)
$
(66,744
)
$
(123,951
)
 
$
(152,910
)
$
(53,519
)
$
(99,391
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
 
 
 
 
 
 
 
 
 
 
 
AOCI (loss), beginning of year
 
$
(186,741
)
$
(65,360
)
$
(121,381
)
 
$
(149,022
)
$
(52,158
)
$
(96,864
)
 
$
(181,079
)
$
(63,378
)
$
(117,701
)
Investment securities
 
(544
)
(354
)
(190
)
 
66

23

43

 
(6,585
)
(2,305
)
(4,280
)
Pension and other postretirement plans
 
(10,259
)
(2,154
)
(8,105
)
 
(37,785
)
(13,225
)
(24,560
)
 
38,642

13,525

25,117

OCI (loss)
 
(10,803
)
(2,508
)
(8,295
)
 
(37,719
)
(13,202
)
(24,517
)
 
32,057

11,220

20,837

Reclassification adjustment (2)
 
—

26,383

(26,383
)
 
—

—

—

 
—

—

—

AOCI (loss), end of year
 
$
(197,544
)
$
(41,485
)
$
(156,059
)
 
$
(186,741
)
$
(65,360
)
$
(121,381
)
 
$
(149,022
)
$
(52,158
)
$
(96,864
)


(1)
Deferred taxes related to unrealized gains and losses for the period from December 23, 2017 through December 31, 2017 were recognized at the 21% corporate rate following enactment of the TCJA. Prior to enactment, they were recognized at the 35% corporate rate.
(2)
A one-time adjustment was made in the fourth quarter of 2017 to reclassify stranded tax effects of the components of AOCI resulting from enactment of TCJA from AOCI to retained earnings. As a result, the ending AOCI balances now reflect the new 21% corporate rate, which represents the rate in which the amounts are expected to be settled. See Note 2, "Significant Accounting Policies".
(3)
These components of accumulated other comprehensive income (loss) are included in the computation of net periodic pension cost. See Note 8, "Postretirement Benefits", for additional information.
(4)
Deferred taxes related to the December 31, 2017 portion of the pension and other postretirement component recognized in AOCI of $10.3 million were recognized at the 21% corporate rate following the enactment of the TCJA.