Investments - Commercial Mortgage Loan Participations (Details) - Commercial mortgage loan participations - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 183,094	$ 142,670
Carrying value, gross, percent	101.00%	101.00%
Allowance for credit losses	$ (1,789)	$ (827)	$ (3,505)
Allowance for credit losses, percent	(1.00%)	(1.00%)
Carrying value, net of valuation allowance	$ 181,305	$ 141,843
Carrying value, net, percent	100.00%	100.00%
California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 64,477	$ 67,659
Carrying value, gross, percent	36.00%	48.00%
Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 33,182	$ 8,213
Carrying value, gross, percent	18.00%	6.00%
Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 22,905	$ 5,898
Carrying value, gross, percent	13.00%	4.00%
New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 19,167	$ 18,374
Carrying value, gross, percent	11.00%	13.00%
Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 14,925	$ 0
Carrying value, gross, percent	8.00%	0.00%
Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 9,940	$ 0
Carrying value, gross, percent	5.00%	0.00%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 18,498	$ 42,526
Carrying value, gross, percent	10.00%	30.00%
Mixed use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 62,375	$ 57,996
Carrying value, gross, percent	34.00%	41.00%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 42,232	$ 14,872
Carrying value, gross, percent	23.00%	11.00%
Hospitality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 27,796	$ 23,186
Carrying value, gross, percent	15.00%	16.00%
Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 27,248	$ 17,900
Carrying value, gross, percent	15.00%	13.00%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 15,342	$ 19,811
Carrying value, gross, percent	9.00%	14.00%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value	$ 8,101	$ 8,905
Carrying value, gross, percent	5.00%	6.00%

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