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Investments - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($) loan issuer Issue	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) loan issuer Issue security	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) security Issue loan issuer	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Unfunded commitments	$ 424,000		$ 424,000
Fixed maturity, portfolio issues \| Issue	2,577		2,577		2,552
Fixed portfolio, number of issuers \| issuer	1,016		1,016		1,014
Non-accrual status with an amortized cost	$ 18,959,797		$ 18,959,797		$ 18,835,809
Debt securities allowance for credit loss	$ 10,355	$ 7,132	$ 10,355	$ 7,132	10,395	$ 10,355	$ 7,027	$ 7,115
Number of loans \| loan	37		37
Carrying value	$ 462,396		$ 462,396		403,732
Provision (reversal) for credit losses	110	1,280	(138)	2,154
Decrease in allowance for credit losses			1,000
Allowance for credit losses	6,629	$ 5,826	6,629	$ 5,826	7,644	$ 6,731	$ 4,546	$ 3,672
Mortgage loans	$ 455,767		$ 455,767		$ 396,088
Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of loans removed form evaluation as a result of foreclosure \| loan	1		2
Outstanding principal value of loans removed form evaluation as a result of foreclosure	$ 2,000		$ 5,000
Commercial Portfolio Segment \| Unfunded Loan Commitment
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	$ 19,000		$ 19,000
Commercial Portfolio Segment \| Loans In Process Of Foreclosure
Debt Securities, Available-for-sale [Line Items]
Number of loans \| loan	2		2
Carrying value	$ 41,000		$ 41,000
Outstanding interest due	0		$ 0
Senior Loans on Non Accrual Status
Debt Securities, Available-for-sale [Line Items]
Number of fixed maturities securities \| security			1		1
Non-accrual status with an amortized cost	5,000		$ 5,000		$ 5,000
Debt securities allowance for credit loss	$ 3,000		$ 3,000		$ 3,000
Collaterally Dependent Loans \| Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of loans \| loan	4		4
Carrying value	$ 49,000		$ 49,000
Provision (reversal) for credit losses			$ 3,000
Nonaccrual Loans \| Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of loans \| loan	3		3		5
Outstanding principal on nonaccrual loan	$ 48,000		$ 48,000		$ 53,000
Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Unfunded commitments	146,000		146,000		$ 167,000
Investment in Limited Partnerships
Debt Securities, Available-for-sale [Line Items]
Unfunded commitments	$ 424,426		424,426
Capital called from investment funds			$ 57,000