Fair Value of Financial Instruments - Carrying Value of Commercial Mortgage Loans and Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total amortized cost	$ 45,421	$ 37,947
Valuation allowance	(55)	(49)
Mortgage loans, net	45,366	37,898
Total mortgage loans | Mortgage Loans by Region
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 45,421	$ 37,947
Percent of Total	100.00%	100.00%
Total mortgage loans | Mortgage Loans by Region | East North Central
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 3,245	$ 3,245
Percent of Total	7.10%	8.60%
Total mortgage loans | Mortgage Loans by Region | Southern Atlantic
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 17,217	$ 9,397
Percent of Total	37.90%	24.70%
Total mortgage loans | Mortgage Loans by Region | East South Central
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 7,526	$ 7,783
Percent of Total	16.60%	20.50%
Total mortgage loans | Mortgage Loans by Region | New England
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 6,588	$ 6,588
Percent of Total	14.50%	17.40%
Total mortgage loans | Mortgage Loans by Region | Middle Atlantic
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 5,979	$ 6,139
Percent of Total	13.20%	16.20%
Total mortgage loans | Mortgage Loans by Region | Mountain
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 1,992	$ 1,992
Percent of Total	4.40%	5.20%
Total mortgage loans | Mortgage Loans by Region | West North Central
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 2,874	$ 2,803
Percent of Total	6.30%	7.40%
Total mortgage loans | Mortgage Loans by Property Type
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 45,421	$ 37,947
Percent of Total	100.00%	100.00%
Total mortgage loans | Mortgage Loans by Property Type | Multifamily
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 8,507	$ 8,493
Percent of Total	18.70%	22.40%
Total mortgage loans | Mortgage Loans by Property Type | Office
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 10,950	$ 11,267
Percent of Total	24.10%	29.70%
Total mortgage loans | Mortgage Loans by Property Type | Industrials
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 9,985	$ 10,056
Percent of Total	22.00%	26.50%
Total mortgage loans | Mortgage Loans by Property Type | Retail
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 10,000	$ 1,992
Percent of Total	22.00%	5.20%
Total mortgage loans | Mortgage Loans by Property Type | Mixed use/Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans, net	$ 5,979	$ 6,139
Percent of Total	13.20%	16.20%
Less than 65%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total amortized cost	$ 36,762	$ 29,231
65%-75%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total amortized cost	$ 8,659	$ 8,716