Other Assets - Information on Commercial Mortgage Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Other Assets [Line Items]
Fair Value / Carrying Value	$ 1,606,204
Commercial Mortgage Bridge Loan
Other Assets [Line Items]
Fair Value / Carrying Value	76,546	$ 61,510
UPB	$ 76,546	$ 61,510
Weighted Average Coupon ( as a percent)	12.93%	11.54%
Weighted Average Term to Maturity (Months)	3 months	10 months
Commercial Mortgage Bridge Loan | UPB 60+ Days Delinquent
Other Assets [Line Items]
UPB	$ 3,389	$ 0
Commercial Mortgage Bridge Loan | Minimum
Other Assets [Line Items]
Participation range to total UPB (as a percent)	49.00%
Commercial Mortgage Bridge Loan | Maximum
Other Assets [Line Items]
Participation range to total UPB (as a percent)	75.00%