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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 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:
Three months endedThree months ended
September 30, 2023September 30, 2022
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI (loss), beginning of period$(55,497)$(11,654)$(43,843)$(57,980)$(12,177)$(45,803)
OCI (loss) before reclassifications(10,064)(2,114)(7,950)(26,524)(5,570)(20,954)
Realized investment losses2,480 521 1,959 4,606 968 3,638 
Impairment losses113 24 89 175 37 138 
OCI (loss)(7,471)(1,569)(5,902)(21,743)(4,565)(17,178)
AOCI (loss), end of period$(62,968)$(13,223)$(49,745)$(79,723)$(16,742)$(62,981)
Pension and other postretirement plans:
AOCI (loss), beginning of period$50,244 $10,551 $39,693 $(35,346)$(7,424)$(27,922)
Amortization of prior service costs362 76 286 361 76 285 
Amortization of net actuarial (gain) loss (3,833)(805)(3,028)1,830 384 1,446 
OCI (loss)(3,471)(729)(2,742)2,191 460 1,731 
AOCI (loss), end of period$46,773 $9,822 $36,951 $(33,155)$(6,964)$(26,191)
Total
AOCI (loss), beginning of period$(5,253)$(1,103)$(4,150)$(93,326)$(19,601)$(73,725)
Investment securities(7,471)(1,569)(5,902)(21,743)(4,565)(17,178)
Pension and other postretirement plans(3,471)(729)(2,742)2,191 460 1,731 
OCI (loss)(10,942)(2,298)(8,644)(19,552)(4,105)(15,447)
AOCI (loss), end of period$(16,195)$(3,401)$(12,794)$(112,878)$(23,706)$(89,172)
Nine months endedNine months ended
September 30, 2023September 30, 2022
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI (loss), beginning of period$(66,571)$(13,980)$(52,591)$7,722 $1,621 $6,101 
OCI (loss) before reclassifications(4,509)(947)(3,562)(96,982)(20,366)(76,616)
Realized investment losses6,195 1,301 4,894 9,108 1,913 7,195 
Impairment losses1,917 403 1,514 429 90 339 
OCI (loss)3,603 757 2,846 (87,445)(18,363)(69,082)
AOCI (loss), end of period$(62,968)$(13,223)$(49,745)$(79,723)$(16,742)$(62,981)
Pension and other postretirement plans:
AOCI (loss), beginning of period$57,186 $12,009 $45,177 $(39,734)$(8,345)$(31,389)
Amortization of prior service costs1,085 228 857 1,082 227 855 
Amortization of net actuarial (gain) loss(11,498)(2,415)(9,083)5,497 1,154 4,343 
OCI (loss)(10,413)(2,187)(8,226)6,579 1,381 5,198 
AOCI (loss), end of period$46,773 $9,822 $36,951 $(33,155)$(6,964)$(26,191)
Total
AOCI (loss), beginning of period$(9,385)$(1,971)$(7,414)$(32,012)$(6,724)$(25,288)
Investment securities3,603 757 2,846 (87,445)(18,363)(69,082)
Pension and other postretirement plans(10,413)(2,187)(8,226)6,579 1,381 5,198 
OCI (loss)(6,810)(1,430)(5,380)(80,866)(16,982)(63,884)
AOCI (loss), end of period$(16,195)$(3,401)$(12,794)$(112,878)$(23,706)$(89,172)