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Accumulated Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 30, 2021
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:
Three months endedThree months ended
June 30, 2021June 30, 2020
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI (loss), beginning of period (1)
$18,306 $3,845 $14,461 $(27,761)$0 $(27,761)
OCI before reclassifications (1)
3,783 795 2,988 40,364 2,646 37,718 
Realized investment gains(397)(84)(313)(355)(75)(280)
Impairment losses1 0 1 17 4 13 
OCI3,387 711 2,676 40,026 2,575 37,451 
AOCI, end of period (1)
$21,693 $4,556 $17,137 $12,265 $2,575 $9,690 
Pension and other postretirement plans:
AOCI (loss), beginning of period$(123,917)$(26,024)$(97,893)$(150,233)$(31,550)$(118,683)
Amortization of prior service costs357 75 282 336 70 266 
Amortization of net actuarial loss 4,027 846 3,181 3,031 637 2,394 
OCI4,384 921 3,463 3,367 707 2,660 
AOCI (loss), end of period$(119,533)$(25,103)$(94,430)$(146,866)$(30,843)$(116,023)
Total
AOCI (loss), beginning of period$(105,611)$(22,179)$(83,432)$(177,994)$(31,550)$(146,444)
Investment securities3,387 711 2,676 40,026 2,575 37,451 
Pension and other postretirement plans4,384 921 3,463 3,367 707 2,660 
OCI7,771 1,632 6,139 43,393 3,282 40,111 
AOCI (loss), end of period$(97,840)$(20,547)$(77,293)$(134,601)$(28,268)$(106,333)
Six months endedSix months ended
June 30, 2021June 30, 2020
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI, beginning of period$29,384 $6,171 $23,213 $5,664 $1,189 $4,475 
OCI (loss) before reclassifications(5,725)(1,202)(4,523)4,671 981 3,690 
Realized investment gains(1,880)(395)(1,485)(970)(204)(766)
Impairment (recoveries) losses(86)(18)(68)2,900 609 2,291 
OCI (loss)(7,691)(1,615)(6,076)6,601 1,386 5,215 
AOCI, end of period$21,693 $4,556 $17,137 $12,265 $2,575 $9,690 
Pension and other postretirement plans:
AOCI (loss), beginning of period$(128,300)$(26,944)$(101,356)$(153,600)$(32,257)$(121,343)
Amortization of prior service costs714 150 564 672 141 531 
Amortization of net actuarial loss8,053 1,691 6,362 6,062 1,273 4,789 
OCI8,767 1,841 6,926 6,734 1,414 5,320 
AOCI (loss), end of period$(119,533)$(25,103)$(94,430)$(146,866)$(30,843)$(116,023)
Total
AOCI (loss), beginning of period$(98,916)$(20,773)$(78,143)$(147,936)$(31,068)$(116,868)
Investment securities(7,691)(1,615)(6,076)6,601 1,386 5,215 
Pension and other postretirement plans8,767 1,841 6,926 6,734 1,414 5,320 
OCI 1,076 226 850 13,335 2,800 10,535 
AOCI (loss), end of period$(97,840)$(20,547)$(77,293)$(134,601)$(28,268)$(106,333)
(1)As of June 30, 2020, the valuation allowance that was recognized on the deferred tax asset primarily related to unrealized losses on our investments at March 31, 2020 was fully released.