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Investments In Fixed Maturity Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments In Fixed Maturity Securities
At December 31, 2021 and 2020, 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, 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 
(In thousands)Amortized
Cost		Allowance for Expected Credit Losses (1)Gross UnrealizedFair
Value		Carrying
Value
GainsLosses
December 31, 2020
Held to maturity:
State and municipal$67,117 $(798)$13,217 $— 79,536 $66,319 
Residential mortgage-backed6,455 — 1,043 — 7,498 6,455 
Total held to maturity73,572 (798)14,260 — 87,034 72,774 
Available for sale:
U.S. government and government agency586,020 — 18,198 (347)603,871 603,871 
State and municipal:
                 Special revenue2,137,162 — 96,924 (714)2,233,372 2,233,372 
                 State general obligation417,397 — 33,407 — 450,804 450,804 
                 Pre-refunded250,081 — 21,472 (162)271,391 271,391 
                 Corporate backed206,356 — 8,755 (638)214,473 214,473 
                 Local general obligation410,583 — 40,596 (555)450,624 450,624 
       Total state and municipal3,421,579 — 201,154 (2,069)3,620,664 3,620,664 
Mortgage-backed securities:
Residential813,187 — 24,664 (5,238)832,613 832,613 
Commercial181,105 — 6,725 (113)187,717 187,717 
Total mortgage-backed securities994,292 — 31,389 (5,351)1,020,330 1,020,330 
Asset-backed securities3,218,048 — 10,035 (33,497)3,194,586 3,194,586 
Corporate:
                 Industrial2,456,516 (518)115,926 (7,449)2,564,475 2,564,475 
                 Financial1,513,943 — 62,947 (987)1,575,903 1,575,903 
                 Utilities389,267 — 31,931 (33)421,165 421,165 
                 Other109,353 — 696 (11)110,038 110,038 
Total corporate4,469,079 (518)211,500 (8,480)4,671,581 4,671,581 
Foreign government993,268 (1,264)28,007 (44,448)975,563 975,563 
Total available for sale13,682,286 (1,782)500,283 (94,192)14,086,595 14,086,595 
Total investments in fixed maturity securities$13,755,858 $(2,580)$514,543 $(94,192)$14,173,629 $14,159,369 
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 year ended December 31, 2021 and 2020:
State and Municipal
(In thousands)20212020
Allowance for expected credit losses, beginning of the period$798 $— 
Cumulative effect adjustment resulting from changes in accounting principles— 69 
Provision for expected credit losses(411)729 
Allowance for expected credit losses, end of period$387 $798 
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 year ended December 31, 2021 and 2020:
20212020
(In thousands)Foreign GovernmentCorporateTotalForeign GovernmentCorporateTotal
Allowance for expected credit losses, beginning of period$1,264 $518 $1,782 $— $— $— 
Cumulative effect adjustment resulting from changes in accounting principles— — — 35,645 — 35,645 
Expected credit losses on securities for which credit losses were not previously recorded19,072 16 19,088 12,590 7,058 19,648 
Expected credit losses (gains) on securities for which credit losses were previously recorded2,438 (513)1,925 373 (3,841)(3,468)
Reduction due to disposals(552)(5)(557)(47,344)(2,699)(50,043)
Allowance for expected credit losses, end of period$22,222 $16 $22,238 $1,264 $518 $1,782 
The Amortized Cost And Fair Value of Fixed Maturity Securities
The amortized cost and fair value of fixed maturity securities at December 31, 2021, 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$1,589,823 $1,586,470 
Due after one year through five years7,574,884 7,659,231 
Due after five years through ten years4,148,118 4,184,007 
Due after ten years2,086,810 2,110,874 
Mortgage-backed securities1,071,282 1,073,536 
Total$16,470,917 $16,614,118 
________________
(1) Amortized cost is reduced by the allowance for expected credit losses of $387 thousand related to held to maturity securities.