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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2026
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:
20262025
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI (loss), beginning of period$1,508 $316 $1,192 $(22,442)$(4,714)$(17,728)
OCI (loss) before reclassifications
(15,982)(3,356)(12,626)6,687 1,404 5,283 
Realized investment (gains) losses(149)(31)(118)262 55 207 
Impairment losses265 56 209 365 77 288 
OCI (loss)
(15,866)(3,331)(12,535)7,314 1,536 5,778 
AOCI (loss), end of period$(14,358)$(3,015)$(11,343)$(15,128)$(3,178)$(11,950)
Pension and other postretirement plans:
AOCI (loss), beginning of period
$(67,359)$(14,146)$(53,213)$(37,802)$(7,939)$(29,863)
Amortization of prior service costs458 96 362 422 89 333 
Amortization of net actuarial gain(67)(14)(53)(654)(137)(517)
Settlement gain— — — (477)(100)(377)
OCI (loss)391 82 309 (709)(148)(561)
AOCI (loss), end of period
$(66,968)$(14,064)$(52,904)$(38,511)$(8,087)$(30,424)
Total
AOCI (loss), beginning of period$(65,851)$(13,830)$(52,021)$(60,244)$(12,653)$(47,591)
Investment securities(15,866)(3,331)(12,535)7,314 1,536 5,778 
Pension and other postretirement plans391 82 309 (709)(148)(561)
OCI (loss)
(15,475)(3,249)(12,226)6,605 1,388 5,217 
AOCI (loss), end of period$(81,326)$(17,079)$(64,247)$(53,639)$(11,265)$(42,374)