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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
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)
 
2018
 
2017
 
2016
 
 
Before Tax
Income Tax (1)
Net
 
Before Tax
Income Tax (1)
Net
 
Before Tax
Income Tax (1)
Net
Investment securities:
 
 
 
 
 
 
 
 
 
 
 
 
AOCI, beginning of year
 
$
3,410

$
716

$
2,694

 
$
3,954

$
1,384

$
2,570

 
$
3,888

$
1,361

$
2,527

OCI (loss) before reclassifications - pre TCJA (1)
 
—

—

—

 
(648
)
(227
)
(421
)
 
(385
)
(135
)
(250
)
OCI before reclassifications - post TCJA (1)
 
(15,372
)
(3,228
)
(12,144
)
 
1,162

243

919

 
—

—

—

Realized investment losses (gains)
 
1,297

272

1,025

 
(1,240
)
(434
)
(806
)
 
35

12

23

Impairment losses
 
1,581

332

1,249

 
182

64

118

 
416

146

270

Cumulative effect of adopting ASU 2016-01 (2)
 
(85
)
(18
)
(67
)
 
—

—

—

 
—

—

—

OCI (loss)
 
(12,579
)
(2,642
)
(9,937
)
 
(544
)
(354
)
(190
)
 
66

23

43

Reclassification adjustment (3)
 
—

—

—

 
—

(314
)
314

 
—

—

—

AOCI, end of year
 
$
(9,169
)
$
(1,926
)
$
(7,243
)
 
$
3,410

$
716

$
2,694

 
$
3,954

$
1,384

$
2,570

 
 
 
 
 
 
 
 
 
 
 
 
 
Pension and other postretirement plans:
 
 
 
 
 
 
 
 
AOCI (loss), beginning of year
 
$
(200,954
)
$
(42,201
)
$
(158,753
)
 
$
(190,695
)
$
(66,744
)
$
(123,951
)
 
$
(152,910
)
$
(53,519
)
$
(99,391
)
OCI (loss) before reclassifications
 
31,401

6,594

24,807

 
(20,314
)
(7,111
)
(13,203
)
 
(46,244
)
(16,185
)
(30,059
)
Amortization of prior service costs (4)
 
1,353

284

1,069

 
871

306

565

 
695

243

452

Amortization of net actuarial loss (4)
 
12,451

2,615

9,836

 
8,882

3,109

5,773

 
7,764

2,717

5,047

Settlement loss (4)
 
—

—

—

 
302

106

196

 
—

—

—

Impact of change in tax rate (5)
 
—

—

—

 
—

1,436

(1,436
)
 
—

—

—

OCI (loss)
 
45,205

9,493

35,712

 
(10,259
)
(2,154
)
(8,105
)
 
(37,785
)
(13,225
)
(24,560
)
Reclassification adjustment (3)
 
—

—

—

 
—

26,697

(26,697
)
 
—

—

—

AOCI (loss), end of year
 
$
(155,749
)
$
(32,708
)
$
(123,041
)
 
$
(200,954
)
$
(42,201
)
$
(158,753
)
 
$
(190,695
)
$
(66,744
)
$
(123,951
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
 
 
 
 
 
 
 
 
 
 
 
AOCI (loss), beginning of year
 
$
(197,544
)
$
(41,485
)
$
(156,059
)
 
$
(186,741
)
$
(65,360
)
$
(121,381
)
 
$
(149,022
)
$
(52,158
)
$
(96,864
)
Investment securities
 
(12,579
)
(2,642
)
(9,937
)
 
(544
)
(354
)
(190
)
 
66

23

43

Pension and other postretirement plans
 
45,205

9,493

35,712

 
(10,259
)
(2,154
)
(8,105
)
 
(37,785
)
(13,225
)
(24,560
)
OCI (loss)
 
32,626

6,851

25,775

 
(10,803
)
(2,508
)
(8,295
)
 
(37,719
)
(13,202
)
(24,517
)
Reclassification adjustment (3)
 
—

—

—

 
—

26,383

(26,383
)
 
—

—

—

AOCI (loss), end of year
 
$
(164,918
)
$
(34,634
)
$
(130,284
)
 
$
(197,544
)
$
(41,485
)
$
(156,059
)
 
$
(186,741
)
$
(65,360
)
$
(121,381
)


(1)
Deferred taxes related to unrealized gains and losses for the period from December 23, 2017 through December 31, 2018 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 reclassification of unrealized losses of equity securities from AOCI to retained earnings was required at January 1, 2018 due to the implementation of ASU 2016-01. See Note 2, "Significant Accounting Policies".
(3)
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, resulting in the ending AOCI balances now reflected at the 21% corporate rate, which represents the rate in which the amounts are expected to be settled. See Note 2, "Significant Accounting Policies".
(4)
These components of accumulated other comprehensive income (loss) are included in the computation of net periodic pension cost. See Note 9, "Postretirement Benefits", for additional information.
(5)
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.