Investments - Schedule of Commercial Mortgage Loan Participations (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 282,871	$ 183,094
Carrying value, gross, percent	101.00%	101.00%
Less allowance for credit losses	$ (3,672)	$ (1,789)	$ (827)
Allowance for credit losses, percent	(1.00%)	(1.00%)
Carrying value, net of valuation allowance	$ 279,199	$ 181,305
Carrying value, net, percent	100.00%	100.00%
California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 54,721	$ 64,477
Carrying value, gross, percent	20.00%	36.00%
Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 48,233	$ 33,182
Carrying value, gross, percent	17.00%	18.00%
Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 45,111	$ 22,905
Carrying value, gross, percent	16.00%	13.00%
New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 44,574	$ 0
Carrying value, gross, percent	16.00%	0.00%
New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 20,284	$ 19,167
Carrying value, gross, percent	7.00%	11.00%
Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 14,979	$ 0
Carrying value, gross, percent	5.00%	0.00%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 54,969	$ 43,363
Carrying value, gross, percent	20.00%	23.00%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 116,299	$ 42,232
Carrying value, gross, percent	42.00%	23.00%
Mixed use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 34,749	$ 62,375
Carrying value, gross, percent	12.00%	34.00%
Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 57,267	$ 27,248
Carrying value, gross, percent	20.00%	15.00%
Hospitality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 43,897	$ 27,796
Carrying value, gross, percent	16.00%	15.00%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 23,925	$ 15,342
Carrying value, gross, percent	9.00%	9.00%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 6,734	$ 8,101
Carrying value, gross, percent	2.00%	5.00%