Secured Financing Agreements - Borrowings by Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase facilities	$ 1,072,132	$ 1,015,566
Asset-specific financings	45,823	44,913
Secured credit facility	100,000	100,000
Total Amount Outstanding	1,217,955	1,160,479
Secured Debt
Assets Sold under Agreements to Repurchase [Line Items]
Secured credit facility	100,000	100,000
Maturity Within One Year
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase facilities	0	632,255
Asset-specific financings	45,823	44,913
Total Amount Outstanding	45,823	677,168
Maturity One To Two Years
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase facilities	863,817	178,718
Asset-specific financings	0	0
Total Amount Outstanding	863,817	178,718
Maturity Two To Three
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase facilities	208,315	204,593
Asset-specific financings	0	0
Total Amount Outstanding	308,315	304,593
Maturity Two To Three | Secured Debt
Assets Sold under Agreements to Repurchase [Line Items]
Secured credit facility	100,000	100,000
Maturity Three To Four Years
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase facilities	0	0
Asset-specific financings	0	0
Total Amount Outstanding	0	0
Maturity Four To Five Years
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase facilities	0	0
Asset-specific financings	0	0
Total Amount Outstanding	0	0
Thereafter
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase facilities	0	0
Asset-specific financings	0	0
Total Amount Outstanding	$ 0	$ 0