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Investments (Tables)
 6 Months Ended
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Realized Investment Gains and Losses The table below presents realized gains and losses for the periods indicated.
Three Months Ended June 30,Six Months Ended June 30,
 2023202220232022
 (In thousands)
Available-for-sale debt securities:    
Realized gains on disposal$46 1,766 113 5,224 
Realized losses on disposal— — — — 
Real estate gains (losses)(20)— (20)336 
Totals$26 1,766 93 5,560 
Schedule of Debt Securities, Available-for-Sale Securities
The table below presents amortized costs and fair values of debt securities available-for-sale at June 30, 2023.
 Debt Securities Available-for-Sale
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value		Allowance for Credit Losses
 (In thousands)
U.S. agencies$25,563 — (258)25,305 — 
U.S. Treasury2,817 — (97)2,720 — 
States and political subdivisions459,815 535 (54,711)405,639 — 
Foreign governments62,956 — (15,056)47,900 — 
Public utilities618,638 113 (63,324)555,427 — 
Corporate5,711,727 1,680 (523,221)5,190,186 — 
Commercial mortgage-backed26,950 — (2,081)24,869 — 
Residential mortgage-backed284,705 179 (15,441)269,443 — 
Asset-backed890,316 1,507 (89,212)802,611 — 
Totals$8,083,487 4,014 (763,401)7,324,100 — 
The table below presents amortized costs and fair values of debt securities available-for-sale at December 31, 2022.

 Debt Securities Available-for-Sale
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value		Allowance for Credit Losses
 (In thousands)
U.S. agencies$21,003 — (377)20,626 — 
U.S. Treasury2,813 6 (90)2,729 — 
States and political subdivisions476,338 668 (65,507)411,499 — 
Foreign governments62,964 — (17,076)45,888 — 
Public utilities681,785 117 (66,765)615,137 — 
Corporate6,199,886 1,940 (570,255)5,631,571 — 
Commercial mortgage-backed21,965 — (1,680)20,285 — 
Residential mortgage-backed337,186 183 (16,338)321,031 — 
Asset-backed634,820 168 (92,121)542,867 — 
Totals$8,438,760 3,082 (830,209)7,611,633 — 
Schedule of Gross Unrealized Losses and Fair Values of Debt Securities, Available-for-Sale Investments, Continuous Unrealized Loss Position
The following table shows the gross unrealized losses and fair values of the Company's available-for-sale debt securities by investment category and length of time the individual securities have been in a continuous unrealized loss position at June 30, 2023.

 Debt Securities Available-for-Sale
 Less than 12 Months12 Months or GreaterTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
 (In thousands)
U.S. agencies$4,812 (23)20,493 (235)25,305 (258)
U.S. Treasury1,005 (6)1,715 (91)2,720 (97)
States and political subdivisions73,667 (1,552)298,198 (53,159)371,865 (54,711)
Foreign governments1,027 (38)46,873 (15,018)47,900 (15,056)
Public utilities71,438 (483)481,425 (62,841)552,863 (63,324)
Corporate620,229 (11,013)4,457,994 (512,208)5,078,223 (523,221)
Commercial mortgage-backed4,964 (37)19,905 (2,044)24,869 (2,081)
Residential mortgage-backed77,817 (2,094)186,047 (13,347)263,864 (15,441)
Asset-backed149,310 (3,840)555,168 (85,372)704,478 (89,212)
Totals$1,004,269 (19,086)6,067,818 (744,315)7,072,087 (763,401)

The following table shows the gross unrealized losses and fair values of the Company's available-for-sale debt securities by investment category and length of time that the individual securities have been in a continuous unrealized loss position at December 31, 2022.

 Debt Securities Available-for-Sale
 Less than 12 Months12 Months or GreaterTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
 (In thousands)
U.S. agencies$20,626 (377)— — 20,626 (377)
U.S. Treasury1,749 (90)— — 1,749 (90)
States and political subdivisions346,009 (55,014)28,420 (10,493)374,429 (65,507)
Foreign governments22,591 (7,658)23,296 (9,420)45,887 (17,078)
Public utilities601,824 (61,970)10,747 (4,795)612,571 (66,765)
Corporate4,985,075 (432,492)434,625 (137,763)5,419,700 (570,255)
Commercial mortgage-backed20,285 (1,680)— — 20,285 (1,680)
Residential mortgage-backed307,410 (16,338)— — 307,410 (16,338)
Asset-backed368,132 (59,936)156,719 (32,185)524,851 (92,121)
Totals$6,673,701 (635,555)653,807 (194,656)7,327,508 (830,211)
Schedule of Investments Classified by Contractual Maturity Date
The amortized cost and fair value of investments in debt securities available-for-sale at June 30, 2023, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

 Debt Securities Available-for-Sale
 Amortized CostFair Value
 (In thousands)
Due in 1 year or less$780,067 768,583 
Due after 1 year through 5 years2,777,128 2,644,309 
Due after 5 years through 10 years1,351,777 1,205,281 
Due after 10 years1,972,544 1,609,004 
 6,881,516 6,227,177 
Mortgage and asset-backed securities1,201,971 1,096,923 
Totals before allowance for credit losses8,083,487 7,324,100 
Allowance for credit losses— — 
Totals$8,083,487 7,324,100 
Schedule of Mortgage Loans by Loan-to-Value Ratio
The following table represents the mortgage loan portfolio by loan-to-value ratio.

June 30, 2023December 31, 2022
Amount%Amount%
(In thousands)(In thousands)
Mortgage Loans by Loan-to-Value Ratio (1):
Less than 50%$117,452 23.5 $100,757 19.7 
50% to 60%142,526 28.5 145,093 28.4 
60% to 70%198,138 39.6 217,445 42.6 
70% to 80%42,169 8.4 47,300 9.3 
Gross balance500,285 100.0 510,595 100.0 
Market value adjustment (1,138)(0.2)(1,290)(0.3)
Allowance for credit losses(3,736)(0.8)(3,575)(0.7)
Totals$495,411 99.0 $505,730 99.0 

(1) Loan-to-Value Ratio is determined using the most recent appraised value. Appraisals are required at the time of funding and may be updated if a material change occurs from the original loan agreement.
Schedule of Allowance for Mortgage Loans
The following table represents the mortgage loan allowance for credit losses.

Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
(In thousands)
Mortgage Loans Allowance for Credit Losses:
Balance, beginning of the period$3,703 2,816 3,575 2,987 
Provision during the period33 (243)161 (414)
Total ending allowance for credit losses$3,736 2,573 3,736 2,573