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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2023
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)202320222021
Before TaxIncome TaxNetBefore TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI (loss), beginning of year$(66,571)$(13,980)$(52,591)$7,722 $1,621 $6,101 $29,384 $6,171 $23,213 
OCI (loss) before reclassifications26,021 5,464 20,557 (89,010)(18,692)(70,318)(16,474)(3,460)(13,014)
Realized investment losses (gains)6,719 1,411 5,308 14,050 2,951 11,099 (5,131)(1,078)(4,053)
Impairment losses (recoveries)2,429 510 1,919 667 140 527 (57)(12)(45)
OCI (loss)35,169 7,385 27,784 (74,293)(15,601)(58,692)(21,662)(4,550)(17,112)
AOCI (loss), end of year$(31,402)$(6,595)$(24,807)$(66,571)$(13,980)$(52,591)$7,722 $1,621 $6,101 
Pension and other postretirement plans:
AOCI (loss), beginning of year$57,186 $12,009 $45,177 $(39,734)$(8,345)$(31,389)$(128,300)$(26,944)$(101,356)
OCI (loss) before reclassifications(28,862)(6,061)(22,801)88,148 18,511 69,637 71,032 14,917 56,115 
Amortization of prior service costs (1)
1,446 304 1,142 1,443 303 1,140 1,428 300 1,128 
Amortization of net actuarial (gain) loss (1)
(15,331)(3,220)(12,111)7,329 1,540 5,789 16,106 3,382 12,724 
OCI (loss)(42,747)(8,977)(33,770)96,920 20,354 76,566 88,566 18,599 69,967 
AOCI (loss), end of year$14,439 $3,032 $11,407 $57,186 $12,009 $45,177 $(39,734)$(8,345)$(31,389)
Total
AOCI (loss), beginning of year$(9,385)$(1,971)$(7,414)$(32,012)$(6,724)$(25,288)$(98,916)$(20,773)$(78,143)
Investment securities35,169 7,385 27,784 (74,293)(15,601)(58,692)(21,662)(4,550)(17,112)
Pension and other postretirement plans(42,747)(8,977)(33,770)96,920 20,354 76,566 88,566 18,599 69,967 
OCI (loss)(7,578)(1,592)(5,986)22,627 4,753 17,874 66,904 14,049 52,855 
AOCI (loss), end of year$(16,963)$(3,563)$(13,400)$(9,385)$(1,971)$(7,414)$(32,012)$(6,724)$(25,288)

(1)These components of AOCI (loss) are included in the computation of net periodic pension (income) cost. See Note 9, "Postretirement Benefits", for additional information.