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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2025
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 Consolidated Statements of Operations where net income is presented, are as follows:
Three months endedThree months ended
September 30, 2025September 30, 2024
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI (loss), beginning of period$(7,202)$(1,513)$(5,689)$(30,405)$(6,385)$(24,020)
OCI before reclassifications7,803 1,638 6,165 25,586 5,373 20,213 
Realized investment gains
(571)(120)(451)(142)(30)(112)
Impairment losses495 104 391 159 33 126 
OCI 7,727 1,622 6,105 25,603 5,376 20,227 
AOCI (loss), end of period$525 $109 $416 $(4,802)$(1,009)$(3,793)
Pension and other postretirement plans:
AOCI (loss), beginning of period$(38,744)$(8,137)$(30,607)$8,730 $1,833 $6,897 
OCI (loss) before reclassifications(1,063)(223)(840)(606)(127)(479)
Amortization of prior service costs422 89 333 413 87 326 
Amortization of net actuarial gain(633)(133)(500)(1,695)(356)(1,339)
Settlement gain(62)(13)(49)(59)(13)(46)
OCI (loss)(1,336)(280)(1,056)(1,947)(409)(1,538)
AOCI (loss), end of period$(40,080)$(8,417)$(31,663)$6,783 $1,424 $5,359 
Total
AOCI (loss), beginning of period$(45,946)$(9,650)$(36,296)$(21,675)$(4,552)$(17,123)
Investment securities7,727 1,622 6,105 25,603 5,376 20,227 
Pension and other postretirement plans(1,336)(280)(1,056)(1,947)(409)(1,538)
OCI 6,391 1,342 5,049 23,656 4,967 18,689 
AOCI (loss), end of period$(39,555)$(8,308)$(31,247)$1,981 $415 $1,566 
Nine months endedNine months ended
September 30, 2025September 30, 2024
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI (loss), beginning of period$(22,442)$(4,714)$(17,728)$(31,402)$(6,595)$(24,807)
OCI before reclassifications21,264 4,465 16,799 23,405 4,915 18,490 
Realized investment losses122 26 96 2,495 524 1,971 
Impairment losses1,581 332 1,249 700 147 553 
OCI22,967 4,823 18,144 26,600 5,586 21,014 
AOCI (loss), end of period$525 $109 $416 $(4,802)$(1,009)$(3,793)
Pension and other postretirement plans:
AOCI (loss), beginning of period
$(37,802)$(7,939)$(29,863)$14,439 $3,032 $11,407 
OCI (loss) before reclassifications(1,063)(223)(840)(2,337)(491)(1,846)
Amortization of prior service costs1,266 266 1,000 1,199 252 947 
Amortization of net actuarial gain(1,942)(408)(1,534)(5,180)(1,088)(4,092)
Settlement gain(539)(113)(426)(1,338)(281)(1,057)
OCI (loss)(2,278)(478)(1,800)(7,656)(1,608)(6,048)
AOCI (loss), end of period
$(40,080)$(8,417)$(31,663)$6,783 $1,424 $5,359 
Total
AOCI (loss), beginning of period$(60,244)$(12,653)$(47,591)$(16,963)$(3,563)$(13,400)
Investment securities22,967 4,823 18,144 26,600 5,586 21,014 
Pension and other postretirement plans(2,278)(478)(1,800)(7,656)(1,608)(6,048)
OCI 20,689 4,345 16,344 18,944 3,978 14,966 
AOCI (loss), end of period$(39,555)$(8,308)$(31,247)$1,981 $415 $1,566