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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 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:
 
 
Three months ended
 
Three months ended
 
 
September 30, 2019
 
September 30, 2018
(in thousands)
 
Before Tax
Income Tax
Net
 
Before Tax
Income Tax
Net
Investment securities:
 
 
 
 
 
 
 
 
AOCI (loss), beginning of period
 
$
1,030

$
216

$
814

 
$
(4,157
)
$
(873
)
$
(3,284
)
OCI (loss) before reclassifications
 
3,991

838

3,153

 
(624
)
(131
)
(493
)
Realized investment (gains) losses
 
(1,072
)
(225
)
(847
)
 
1

0

1

Impairment losses
 
31

7

24

 
0

0

0

OCI (loss)
 
2,950

620

2,330

 
(623
)
(131
)
(492
)
AOCI (loss), end of period
 
$
3,980

$
836

$
3,144

 
$
(4,780
)
$
(1,004
)
$
(3,776
)
 
 
 
 
 
 
 
 
 
Pension and other postretirement plans:
 
 
 
 
 
 
 
 
AOCI (loss), beginning of period
 
$
(152,632
)
$
(32,054
)
$
(120,578
)
 
$
(200,954
)
$
(42,201
)
$
(158,753
)
Amortization of prior service costs (1)
 
349

74

275

 
0

0

0

Amortization of net actuarial loss (1)
 
1,210

254

956

 
0

0

0

OCI
 
1,559

328

1,231

 
0

0

0

AOCI (loss), end of period
 
$
(151,073
)
$
(31,726
)
$
(119,347
)
 
$
(200,954
)
$
(42,201
)
$
(158,753
)
 
 
 
 
 
 
 
 
 
Total
 
 
 
 
 
 
 
 
AOCI (loss), beginning of period
 
$
(151,602
)
$
(31,838
)
$
(119,764
)
 
$
(205,111
)
$
(43,074
)
$
(162,037
)
Investment securities
 
2,950

620

2,330

 
(623
)
(131
)
(492
)
Pension and other postretirement plans
 
1,559

328

1,231

 
0

0

0

OCI (loss)
 
4,509

948

3,561

 
(623
)
(131
)
(492
)
AOCI (loss), end of period
 
$
(147,093
)
$
(30,890
)
$
(116,203
)
 
$
(205,734
)
$
(43,205
)
$
(162,529
)
 
 
 
Nine months ended
 
Nine months ended
 
 
September 30, 2019
 
September 30, 2018
(in thousands)
 
Before Tax
Income Tax
Net
 
Before Tax
Income Tax
Net
Investment securities:
 
 
 
 
 
 
 
 
AOCI (loss), beginning of period
 
$
(9,169
)
$
(1,926
)
$
(7,243
)
 
$
3,410

$
716

$
2,694

OCI (loss) before reclassifications
 
17,185

3,609

13,576

 
(9,163
)
(1,924
)
(7,239
)
Realized investment (gains) losses
 
(4,229
)
(888
)
(3,341
)
 
412

86

326

Impairment losses
 
193

41

152

 
646

136

510

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

—

—

 
(85
)
(18
)
(67
)
OCI (loss)
 
13,149

2,762

10,387

 
(8,190
)
(1,720
)
(6,470
)
AOCI (loss), end of period
 
$
3,980

$
836

$
3,144

 
$
(4,780
)
$
(1,004
)
$
(3,776
)
 
 
 
 
 
 
 
 
 
Pension and other postretirement plans:
 
 
 
 
 
 
 
 
AOCI (loss), beginning of period
 
$
(155,749
)
$
(32,708
)
$
(123,041
)
 
$
(200,954
)
$
(42,201
)
$
(158,753
)
Amortization of prior service costs (1)
 
1,046

220

826

 
0

0

0

Amortization of net actuarial loss (1)
 
3,630

762

2,868

 
0

0

0

OCI
 
4,676

982

3,694

 
0

0

0

AOCI (loss), end of period
 
$
(151,073
)
$
(31,726
)
$
(119,347
)
 
$
(200,954
)
$
(42,201
)
$
(158,753
)
 
 
 
 
 
 
 
 
 
Total
 
 
 
 
 
 
 
 
AOCI (loss), beginning of period
 
$
(164,918
)
$
(34,634
)
$
(130,284
)
 
$
(197,544
)
$
(41,485
)
$
(156,059
)
Investment securities
 
13,149

2,762

10,387

 
(8,190
)
(1,720
)
(6,470
)
Pension and other postretirement plans
 
4,676

982

3,694

 
0

0

0

OCI (loss)
 
17,825

3,744

14,081

 
(8,190
)
(1,720
)
(6,470
)
AOCI (loss), end of period
 
$
(147,093
)
$
(30,890
)
$
(116,203
)
 
$
(205,734
)
$
(43,205
)
$
(162,529
)

(1)
Effective January 1, 2019, amounts reclassified from AOCI related to amortization of prior service costs and net actuarial loss were recorded during interim periods. Prior to 2019, amounts reclassified for these items were recorded on an annual basis. These components are included in the computation of net periodic pension cost. See Note 9, "Postretirement Benefits", for additional information.
(2)
ASU 2016-01 required a reclassification of unrealized losses of equity securities from AOCI to retained earnings at January 1, 2018.