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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2019
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)
 
2019
 
2018
 
2017
 
 
Before Tax
Income Tax (1)
Net
 
Before Tax
Income Tax (1)
Net
 
Before Tax
Income Tax (1)
Net
Investment securities:
 
 
 
 
 
 
 
 
 
 
 
 
AOCI (loss), beginning of year
 
$
(9,169
)
$
(1,926
)
$
(7,243
)
 
$
3,410

$
716

$
2,694

 
$
3,954

$
1,384

$
2,570

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

—

—

 
—

—

—

 
(648
)
(227
)
(421
)
OCI (loss) before reclassifications - post TCJA (1)
 
19,257

4,044

15,213

 
(15,372
)
(3,228
)
(12,144
)
 
1,162

243

919

Realized investment (gains) losses
 
(4,619
)
(970
)
(3,649
)
 
1,297

272

1,025

 
(1,240
)
(434
)
(806
)
Impairment losses
 
195

41

154

 
1,581

332

1,249

 
182

64

118

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

—

—

 
(85
)
(18
)
(67
)
 
—

—

—

OCI (loss)
 
14,833

3,115

11,718

 
(12,579
)
(2,642
)
(9,937
)
 
(544
)
(354
)
(190
)
Reclassification adjustment (3)
 
—

—

—

 
—

—

—

 
—

(314
)
314

AOCI (loss), end of year
 
$
5,664

$
1,189

$
4,475

 
$
(9,169
)
$
(1,926
)
$
(7,243
)
 
$
3,410

$
716

$
2,694

 
 
 
 
 
 
 
 
 
 
 
 
 
Pension and other postretirement plans:
 
 
 
 
 
 
 
 
AOCI (loss), beginning of year
 
$
(155,749
)
$
(32,708
)
$
(123,041
)
 
$
(200,954
)
$
(42,201
)
$
(158,753
)
 
$
(190,695
)
$
(66,744
)
$
(123,951
)
OCI (loss) before reclassifications
 
(4,085
)
(858
)
(3,227
)
 
31,401

6,594

24,807

 
(20,314
)
(7,111
)
(13,203
)
Amortization of prior service costs (4)
 
1,394

293

1,101

 
1,353

284

1,069

 
871

306

565

Amortization of net actuarial loss (4)
 
4,840

1,016

3,824

 
12,451

2,615

9,836

 
8,882

3,109

5,773

Settlement loss (4)
 
—

—

—

 
—

—

—

 
302

106

196

Impact of change in tax rate (5)
 
—

—

—

 
—

—

—

 
—

1,436

(1,436
)
OCI (loss)
 
2,149

451

1,698

 
45,205

9,493

35,712

 
(10,259
)
(2,154
)
(8,105
)
Reclassification adjustment (3)
 
—

—

—

 
—

—

—

 
—

26,697

(26,697
)
AOCI (loss), end of year
 
$
(153,600
)
$
(32,257
)
$
(121,343
)
 
$
(155,749
)
$
(32,708
)
$
(123,041
)
 
$
(200,954
)
$
(42,201
)
$
(158,753
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
 
 
 
 
 
 
 
 
 
 
 
AOCI (loss), beginning of year
 
$
(164,918
)
$
(34,634
)
$
(130,284
)
 
$
(197,544
)
$
(41,485
)
$
(156,059
)
 
$
(186,741
)
$
(65,360
)
$
(121,381
)
Investment securities
 
14,833

3,115

11,718

 
(12,579
)
(2,642
)
(9,937
)
 
(544
)
(354
)
(190
)
Pension and other postretirement plans
 
2,149

451

1,698

 
45,205

9,493

35,712

 
(10,259
)
(2,154
)
(8,105
)
OCI (loss)
 
16,982

3,566

13,416

 
32,626

6,851

25,775

 
(10,803
)
(2,508
)
(8,295
)
Reclassification adjustment (3)
 
—

—

—

 
—

—

—

 
—

26,383

(26,383
)
AOCI (loss), end of year
 
$
(147,936
)
$
(31,068
)
$
(116,868
)
 
$
(164,918
)
$
(34,634
)
$
(130,284
)
 
$
(197,544
)
$
(41,485
)
$
(156,059
)


(1)
Deferred taxes related to unrealized gains and losses for the period from December 23, 2017 through December 31, 2019 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 (loss) to retained earnings was required at January 1, 2018 as a result of new accounting guidance.
(3)
A one-time adjustment was made in 2017 to reclassify stranded tax effects of the components of AOCI (loss) resulting from enactment of TCJA from AOCI (loss) to retained earnings. See Note 2, "Significant Accounting Policies".
(4)
These components of AOCI (loss) are included in the computation of net periodic pension cost. See Note 10, "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 (loss) of $10.3 million were recognized at the 21% corporate rate following the enactment of the TCJA.