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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2020
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
 
 
March 31, 2020
 
March 31, 2019
(in thousands)
 
Before Tax
Income Tax
Net
 
Before Tax
Income Tax
Net
Investment securities:
 
 
 
 
 
 
 
 
AOCI (loss), beginning of period
 
$
5,664

$
1,189

$
4,475

 
$
(9,169
)
$
(1,926
)
$
(7,243
)
OCI (loss) before reclassifications (1)
 
(35,693
)
(1,665
)
(34,028
)
 
8,774

1,843

6,931

Realized investment gains
 
(615
)
(129
)
(486
)
 
(1,918
)
(403
)
(1,515
)
Impairment losses
 
2,883

605

2,278

 
78

16

62

OCI (loss)
 
(33,425
)
(1,189
)
(32,236
)
 
6,934

1,456

5,478

AOCI (loss), end of period (1)
 
$
(27,761
)
$
0

$
(27,761
)
 
$
(2,235
)
$
(470
)
$
(1,765
)
 
 
 
 
 
 
 
 
 
Pension and other postretirement plans:
 
 
 
 
 
 
 
 
AOCI (loss), beginning of period
 
$
(153,600
)
$
(32,257
)
$
(121,343
)
 
$
(155,749
)
$
(32,708
)
$
(123,041
)
Amortization of prior service costs
 
336

71

265

 
349

73

276

Amortization of net actuarial loss
 
3,031

636

2,395

 
1,210

254

956

OCI
 
3,367

707

2,660

 
1,559

327

1,232

AOCI (loss), end of period
 
$
(150,233
)
$
(31,550
)
$
(118,683
)
 
$
(154,190
)
$
(32,381
)
$
(121,809
)
 
 
 
 
 
 
 
 
 
Total
 
 
 
 
 
 
 
 
AOCI (loss), beginning of period
 
$
(147,936
)
$
(31,068
)
$
(116,868
)
 
$
(164,918
)
$
(34,634
)
$
(130,284
)
Investment securities
 
(33,425
)
(1,189
)
(32,236
)
 
6,934

1,456

5,478

Pension and other postretirement plans
 
3,367

707

2,660

 
1,559

327

1,232

OCI (loss)
 
(30,058
)
(482
)
(29,576
)
 
8,493

1,783

6,710

AOCI (loss), end of period
 
$
(177,994
)
$
(31,550
)
$
(146,444
)
 
$
(156,425
)
$
(32,851
)
$
(123,574
)


(1)
As of March 31, 2020, a valuation allowance was recognized on the deferred tax asset primarily related to unrealized losses on our investments.