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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2025
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 Consolidated 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 Consolidated Statements of Operations where net income is presented, are as follows for the three months ended March 31:
20252024
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI (loss), beginning of period$(22,442)$(4,714)$(17,728)$(31,402)$(6,595)$(24,807)
OCI (loss) before reclassifications6,687 1,404 5,283 (1,554)(326)(1,228)
Realized investment losses262 55 207 262 55 207 
Impairment losses365 77 288 338 71 267 
OCI (loss)
7,314 1,536 5,778 (954)(200)(754)
AOCI (loss), end of period$(15,128)$(3,178)$(11,950)$(32,356)$(6,795)$(25,561)
Pension and other postretirement plans:
AOCI (loss), beginning of period
$(37,802)$(7,939)$(29,863)$14,439 $3,032 $11,407 
Amortization of prior service costs422 89 333 389 82 307 
Amortization of net actuarial gain(654)(137)(517)(1,751)(368)(1,383)
Settlement gain(477)(100)(377)0 0 0 
OCI (loss)(709)(148)(561)(1,362)(286)(1,076)
AOCI (loss), end of period
$(38,511)$(8,087)$(30,424)$13,077 $2,746 $10,331 
Total
AOCI (loss), beginning of period$(60,244)$(12,653)$(47,591)$(16,963)$(3,563)$(13,400)
Investment securities7,314 1,536 5,778 (954)(200)(754)
Pension and other postretirement plans(709)(148)(561)(1,362)(286)(1,076)
OCI (loss)6,605 1,388 5,217 (2,316)(486)(1,830)
AOCI (loss), end of period$(53,639)$(11,265)$(42,374)$(19,279)$(4,049)$(15,230)