Investments - Additional Information (Details) $ in Thousands	12 Months Ended
Dec. 31, 2025 USD ($) loan Issue issuer security	Dec. 31, 2024 USD ($) loan issuer security Issue	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Unfunded commitments	$ 558,000
Fixed maturity, portfolio issues \| Issue	2,576	2,552
Fixed portfolio, number of issuers \| issuer	1,010	1,014
Debt securities, available-for-sale, unrealized loss position, accumulated loss	$ 1,637,807	$ 1,924,989
Decrease in gross unrealized losses	287,000
Non-accrual status with an amortized cost	18,820,464	18,835,809
Debt securities allowance for credit loss	$ 3,297	10,395	$ 7,115
Number of loans \| loan	36
Number of loans collaterally dependent \| loan	3
Carrying value	$ 433,032	403,732
Allowance for credit losses	$ 4,515	7,644	$ 3,672
Number of loans removed from evaluation and returned to pool assessment \| loan	1
Outstanding principal value of loans removed from evaluation and returned to pool assessment	$ 7,000
Increase (decrease) in allowance for credit losses	$ (3,100)
Number of loans in non-accrual status \| loan	2
Mortgage loans	$ 428,517	$ 396,088
Capital called from investment funds	$ 251,000
Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of loans removed from evaluation due to foreclosure \| loan	4
Outstanding principal value of loans removed form evaluation due to foreclosure	$ 45,800
Number of delinquent loans \| loan	0	1
Outstanding interest on delinquent loan		$ 31
Commercial Portfolio Segment \| Unfunded Loan Commitment
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	$ 21,000
Senior Loans on Non Accrual Status
Debt Securities, Available-for-sale [Line Items]
Number of fixed maturities securities \| security	2,000	1
Non-accrual status with an amortized cost	$ 9,200	$ 5,500
Debt securities allowance for credit loss	3,300	$ 3,300
Collaterally Dependent Loans \| Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Carrying value	4,300
Allowance for credit losses	659
Nonaccrual Loans \| Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of loans \| loan		5
Outstanding principal on nonaccrual loan	3,000	$ 53,000
Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Unfunded commitments	313,000	$ 167,000
Investment in Limited Partnerships
Debt Securities, Available-for-sale [Line Items]
Unfunded commitments	557,765
Capital called from investment funds	$ 251,000

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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Section 50
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