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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2022
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 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 Statements of Operations where net income is presented, are as follows:
Three months endedThree months ended
June 30, 2022June 30, 2021
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI (loss), beginning of period$(26,353)$(5,535)$(20,818)$18,306 $3,845 $14,461 
OCI (loss) before reclassifications(34,087)(7,158)(26,929)3,783 795 2,988 
Realized investment losses (gains)2,422 508 1,914 (397)(84)(313)
Impairment losses38 8 30 1 0 1 
OCI (loss)(31,627)(6,642)(24,985)3,387 711 2,676 
AOCI (loss), end of period$(57,980)$(12,177)$(45,803)$21,693 $4,556 $17,137 
Pension and other postretirement plans:
AOCI (loss), beginning of period$(37,543)$(7,884)$(29,659)$(123,917)$(26,024)$(97,893)
Amortization of prior service costs360 75 285 357 75 282 
Amortization of net actuarial loss 1,837 385 1,452 4,027 846 3,181 
OCI2,197 460 1,737 4,384 921 3,463 
AOCI (loss), end of period$(35,346)$(7,424)$(27,922)$(119,533)$(25,103)$(94,430)
Total
AOCI (loss), beginning of period$(63,896)$(13,419)$(50,477)$(105,611)$(22,179)$(83,432)
Investment securities(31,627)(6,642)(24,985)3,387 711 2,676 
Pension and other postretirement plans2,197 460 1,737 4,384 921 3,463 
OCI (loss)(29,430)(6,182)(23,248)7,771 1,632 6,139 
AOCI (loss), end of period$(93,326)$(19,601)$(73,725)$(97,840)$(20,547)$(77,293)
Six months endedSix months ended
June 30, 2022June 30, 2021
(in thousands)Before TaxIncome TaxNetBefore TaxIncome TaxNet
Investment securities:
AOCI, beginning of period$7,722 $1,621 $6,101 $29,384 $6,171 $23,213 
OCI (loss) before reclassifications(70,458)(14,796)(55,662)(5,725)(1,202)(4,523)
Realized investment losses (gains)4,502 945 3,557 (1,880)(395)(1,485)
Impairment losses (recoveries)254 53 201 (86)(18)(68)
OCI (loss)(65,702)(13,798)(51,904)(7,691)(1,615)(6,076)
AOCI (loss), end of period$(57,980)$(12,177)$(45,803)$21,693 $4,556 $17,137 
Pension and other postretirement plans:
AOCI (loss), beginning of period$(39,734)$(8,345)$(31,389)$(128,300)$(26,944)$(101,356)
Amortization of prior service costs721 151 570 714 150 564 
Amortization of net actuarial loss3,667 770 2,897 8,053 1,691 6,362 
OCI4,388 921 3,467 8,767 1,841 6,926 
AOCI (loss), end of period$(35,346)$(7,424)$(27,922)$(119,533)$(25,103)$(94,430)
Total
AOCI (loss), beginning of period$(32,012)$(6,724)$(25,288)$(98,916)$(20,773)$(78,143)
Investment securities(65,702)(13,798)(51,904)(7,691)(1,615)(6,076)
Pension and other postretirement plans4,388 921 3,467 8,767 1,841 6,926 
OCI (loss)(61,314)(12,877)(48,437)1,076 226 850 
AOCI (loss), end of period$(93,326)$(19,601)$(73,725)$(97,840)$(20,547)$(77,293)