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Accumulated Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2024
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 three months ended March 31:
20242023
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI (loss), beginning of period$(31,402)$(6,595)$(24,807)$(66,571)$(13,980)$(52,591)
OCI (loss) before reclassifications(1,554)(326)(1,228)10,032 2,107 7,925 
Realized investment losses262 55 207 1,619 340 1,279 
Impairment losses338 71 267 1,633 343 1,290 
OCI (loss)(954)(200)(754)13,284 2,790 10,494 
AOCI (loss), end of period$(32,356)$(6,795)$(25,561)$(53,287)$(11,190)$(42,097)
Pension and other postretirement plans:
AOCI, beginning of period$14,439 $3,032 $11,407 $57,186 $12,009 $45,177 
Amortization of prior service costs389 82 307 362 76 286 
Amortization of net actuarial gain(1,751)(368)(1,383)(3,833)(805)(3,028)
OCI (loss)(1,362)(286)(1,076)(3,471)(729)(2,742)
AOCI, end of period$13,077 $2,746 $10,331 $53,715 $11,280 $42,435 
Total
AOCI (loss), beginning of period$(16,963)$(3,563)$(13,400)$(9,385)$(1,971)$(7,414)
Investment securities(954)(200)(754)13,284 2,790 10,494 
Pension and other postretirement plans(1,362)(286)(1,076)(3,471)(729)(2,742)
OCI (loss)(2,316)(486)(1,830)9,813 2,061 7,752 
AOCI (loss), end of period$(19,279)$(4,049)$(15,230)$428 $90 $338