Investments - Schedule of Commercial Mortgage Loan Participations Recorded Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	$ 451,898		$ 396,088
Carrying value, gross	457,531		403,732
Less allowance for credit losses	$ (5,633)	$ (6,629)	$ (7,644)	$ (7,202)	$ (5,826)	$ (3,672)
% of Gross Total	100.00%		100.00%
Less than 70%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value, gross	$ 449,301		$ 349,868
% of Gross Total	98.00%		87.00%
70% to 80%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value, gross	$ 0		$ 0
% of Gross Total	0.00%		0.00%
81% to 90%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value, gross	$ 0		$ 0
% of Gross Total	0.00%		0.00%
Greater than 90%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value, gross	$ 8,230		$ 53,864
% of Gross Total	2.00%		13.00%
Less Than 1.00x
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	$ 69,100		$ 104,643
Less Than 1.00x | Less than 70%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	60,870		88,507
Less Than 1.00x | 70% to 80%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	0		0
Less Than 1.00x | 81% to 90%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	0		0
Less Than 1.00x | Greater than 90%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	8,230		16,136
1.00x—1.20x
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	83,634		102,222
1.00x—1.20x | Less than 70%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	83,634		64,494
1.00x—1.20x | 70% to 80%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	0		0
1.00x—1.20x | 81% to 90%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	0		0
1.00x—1.20x | Greater than 90%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	0		37,728
Greater Than 1.20x
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	304,797		196,867
Greater Than 1.20x | Less than 70%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	304,797		196,867
Greater Than 1.20x | 70% to 80%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	0		0
Greater Than 1.20x | 81% to 90%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	0		0
Greater Than 1.20x | Greater than 90%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total, net of allowance for credit losses	$ 0		$ 0