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Investments In Fixed Maturity Securities (Tables)
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Investments In Fixed Maturity Securities
At December 31, 2022 and 2021, investments in fixed maturity securities were as follows:
(In thousands)Amortized
Cost		Allowance for Expected Credit Losses (1)Gross UnrealizedFair
Value		Carrying
Value
GainsLosses
December 31, 2022
Held to maturity:
State and municipal$47,802 $(114)$4,239 $— $51,927 $47,688 
Residential mortgage-backed3,608 — 38 — 3,646 3,608 
Total held to maturity51,410 (114)4,277 — 55,573 51,296 
Available for sale:
U.S. government and government agency960,479 — 937 (69,158)892,258 892,258 
State and municipal:
                 Special revenue1,837,309 — 3,662 (119,474)1,721,497 1,721,497 
                 State general obligation387,709 — 2,651 (21,335)369,025 369,025 
                 Pre-refunded156,106 — 2,741 (7)158,840 158,840 
                 Corporate backed210,228 — 334 (10,923)199,639 199,639 
                 Local general obligation454,983 — 2,967 (16,853)441,097 441,097 
       Total state and municipal3,046,335 — 12,355 (168,592)2,890,098 2,890,098 
Mortgage-backed securities:
Residential1,308,019 (18)395 (171,595)1,136,801 1,136,801 
Commercial547,757 — 215 (19,363)528,609 528,609 
Total mortgage-backed securities1,855,776 (18)610 (190,958)1,665,410 1,665,410 
Asset-backed securities4,132,365 — 2,730 (152,322)3,982,773 3,982,773 
Corporate:
                 Industrial3,491,645 (1,704)4,439 (241,381)3,252,999 3,252,999 
                 Financial2,585,247 (2,997)5,505 (117,383)2,470,372 2,470,372 
                 Utilities586,066 — 1,307 (36,325)551,048 551,048 
                 Other441,230 — — (11,657)429,573 429,573 
Total corporate7,104,188 (4,701)11,251 (406,746)6,703,992 6,703,992 
Foreign government1,564,930 (32,633)4,283 (135,058)1,401,522 1,401,522 
Total available for sale18,664,073 (37,352)32,166 (1,122,834)17,536,053 17,536,053 
Total investments in fixed maturity securities$18,715,483 $(37,466)$36,443 $(1,122,834)$17,591,626 $17,587,349 
(In thousands)Amortized
Cost		Allowance for Expected Credit Losses (1)Gross UnrealizedFair
Value		Carrying
Value
GainsLosses
December 31, 2021
Held to maturity:
State and municipal$69,539 $(387)$10,813 $— $79,965 $69,152 
Residential mortgage-backed4,829 — 632 — 5,461 4,829 
Total held to maturity74,368 (387)11,445 — 85,426 73,981 
Available for sale:
U.S. government and government agency851,128 — 8,509 (4,294)855,343 855,343 
State and municipal:
                 Special revenue2,016,382 — 62,961 (5,706)2,073,637 2,073,637 
                 State general obligation388,110 — 23,152 (1,015)410,247 410,247 
                 Pre-refunded202,633 — 14,891 (574)216,950 216,950 
                 Corporate backed166,943 — 7,191 (1,532)172,602 172,602 
                 Local general obligation401,974 — 29,455 (732)430,697 430,697 
       Total state and municipal3,176,042 — 137,650 (9,559)3,304,133 3,304,133 
Mortgage-backed securities:
Residential940,744 — 9,896 (11,321)939,319 939,319 
Commercial125,709 — 3,388 (341)128,756 128,756 
Total mortgage-backed securities1,066,453 — 13,284 (11,662)1,068,075 1,068,075 
Asset-backed securities4,504,950 — 4,409 (18,794)4,490,565 4,490,565 
Corporate:
                 Industrial3,231,520 (16)62,751 (21,092)3,273,163 3,273,163 
                 Financial1,739,282 — 30,709 (6,591)1,763,400 1,763,400 
                 Utilities396,242 — 13,262 (3,202)406,302 406,302 
                 Other154,210 — 125 (1,525)152,810 152,810 
Total corporate5,521,254 (16)106,847 (32,410)5,595,675 5,595,675 
Foreign government1,277,109 (22,222)7,508 (47,494)1,214,901 1,214,901 
Total available for sale16,396,936 (22,238)278,207 (124,213)16,528,692 16,528,692 
Total investments in fixed maturity securities$16,471,304 $(22,625)$289,652 $(124,213)$16,614,118 $16,602,673 
Debt Securities, Held-to-maturity, Allowance for Credit Loss
The following table presents the rollforward of the allowance for expected credit losses for held to maturity securities for the years ended December 31, 2022 and 2021:
State and Municipal
(In thousands)20222021
Allowance for expected credit losses, beginning of period$387 $798 
Change in allowance for expected credit losses(273)(411)
Allowance for expected credit losses, end of period$114 $387 
Debt Securities, Available-for-sale, Allowance for Credit Loss The following table presents the rollforward of the allowance for expected credit losses for available for sale securities for the years ended December 31, 2022 and 2021:
20222021
(In thousands)Foreign GovernmentCorporateMortgage- BackedTotalForeign GovernmentCorporateTotal
Allowance for expected credit losses, beginning of period$22,222 $16 $— $22,238 $1,264 $518 $1,782 
Expected credit losses on securities for which credit losses were not previously recorded1,910 2,648 21 4,579 19,072 16 19,088 
Expected credit losses (gains) on securities for which credit losses were previously recorded8,534 2,042 (3)10,573 2,438 (513)1,925 
Reduction due to disposals(33)(5)— (38)(552)(5)(557)
Allowance for expected credit losses, end of period$32,633 $4,701 $18 $37,352 $22,222 $16 $22,238 
The Amortized Cost And Fair Value of Fixed Maturity Securities
The amortized cost and fair value of fixed maturity securities at December 31, 2022, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations.
(In thousands)Amortized
Cost (1)		Fair Value
Due in one year or less$1,570,480 $1,527,090 
Due after one year through five years8,746,271 8,299,945 
Due after five years through ten years4,395,236 4,119,772 
Due after ten years2,143,998 1,975,763 
Mortgage-backed securities1,859,384 1,669,056 
Total$18,715,369 $17,591,626 
________________
(1) Amortized cost is reduced by the allowance for expected credit losses of $114 thousand related to held to maturity securities.