Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

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)	2020						2019						2018
	Before Tax		Income Tax		Net		Before Tax		Income Tax		Net		Before Tax		Income Tax		Net
Investment securities:
AOCI (loss), beginning of year	$	5,664	$	1,189	$	4,475	$	(9,169)	$	(1,926)	$	(7,243)	$	3,410	$	716	$	2,694
OCI (loss) before reclassifications	22,074		4,636		17,438		19,257		4,044		15,213		(15,372)		(3,228)		(12,144)
Realized investment (gains) losses	(1,335)		(280)		(1,055)		(4,619)		(970)		(3,649)		1,297		272		1,025
Impairment losses	2,981		626		2,355		195		41		154		1,581		332		1,249
Cumulative effect of adopting ASU 2016-01 (1)	—		—		—		—		—		—		(85)		(18)		(67)
OCI (loss)	23,720		4,982		18,738		14,833		3,115		11,718		(12,579)		(2,642)		(9,937)
AOCI (loss), end of year	$	29,384	$	6,171	$	23,213	$	5,664	$	1,189	$	4,475	$	(9,169)	$	(1,926)	$	(7,243)
Pension and other postretirement plans:
AOCI (loss), beginning of year	$	(153,600)	$	(32,257)	$	(121,343)	$	(155,749)	$	(32,708)	$	(123,041)	$	(200,954)	$	(42,201)	$	(158,753)
OCI (loss) before reclassifications	11,832		2,485		9,347		(4,085)		(858)		(3,227)		31,401		6,594		24,807
Amortization of prior service costs (2)	1,343		282		1,061		1,394		293		1,101		1,353		284		1,069
Amortization of net actuarial loss (2)	12,125		2,546		9,579		4,840		1,016		3,824		12,451		2,615		9,836
OCI	25,300		5,313		19,987		2,149		451		1,698		45,205		9,493		35,712
AOCI (loss), end of year	$	(128,300)	$	(26,944)	$	(101,356)	$	(153,600)	$	(32,257)	$	(121,343)	$	(155,749)	$	(32,708)	$	(123,041)
Total
AOCI (loss), beginning of year	$	(147,936)	$	(31,068)	$	(116,868)	$	(164,918)	$	(34,634)	$	(130,284)	$	(197,544)	$	(41,485)	$	(156,059)
Investment securities	23,720		4,982		18,738		14,833		3,115		11,718		(12,579)		(2,642)		(9,937)
Pension and other postretirement plans	25,300		5,313		19,987		2,149		451		1,698		45,205		9,493		35,712
OCI	49,020		10,295		38,725		16,982		3,566		13,416		32,626		6,851		25,775
AOCI (loss), end of year	$	(98,916)	$	(20,773)	$	(78,143)	$	(147,936)	$	(31,068)	$	(116,868)	$	(164,918)	$	(34,634)	$	(130,284)

(1)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.

(2)These components of AOCI (loss) are included in the computation of net periodic pension cost. See Note 10, "Postretirement Benefits", for additional information.