Secured Financing Agreements - Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Assets Sold under Agreements to Repurchase [Line Items]
Principal	$ 2,994,191	$ 2,824,371
Repurchase Agreements
Assets Sold under Agreements to Repurchase [Line Items]
Principal	3,005,806	2,842,160
Debt issuance costs, net	1,000
Repurchase Agreements | Overnight
Assets Sold under Agreements to Repurchase [Line Items]
Principal	0	0
Repurchase Agreements | 1 to 29 days
Assets Sold under Agreements to Repurchase [Line Items]
Principal	704,233	642,358
Repurchase Agreements | 30 to 59 days
Assets Sold under Agreements to Repurchase [Line Items]
Principal	469,914	959,559
Repurchase Agreements | 60 to 89 days
Assets Sold under Agreements to Repurchase [Line Items]
Principal	219,973	318,750
Repurchase Agreements | 90 to 119 days
Assets Sold under Agreements to Repurchase [Line Items]
Principal	70,769	51,416
Repurchase Agreements | 120 to 180 days
Assets Sold under Agreements to Repurchase [Line Items]
Principal	156,424	123,072
Repurchase Agreements | 180 days to 1 year
Assets Sold under Agreements to Repurchase [Line Items]
Principal	469,938	409,760
Repurchase Agreements | 1 to 2 years
Assets Sold under Agreements to Repurchase [Line Items]
Principal	582,209	0
Repurchase Agreements | 2 to 3 years
Assets Sold under Agreements to Repurchase [Line Items]
Principal	$ 332,346	$ 337,245
Repurchase Agreements | Weighted Average Borrowing Rates
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	6.22%	6.48%
Repurchase Agreements | Weighted Average Borrowing Rates | 1 to 29 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.21%	5.61%
Repurchase Agreements | Weighted Average Borrowing Rates | 30 to 59 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	6.23%	7.79%
Repurchase Agreements | Weighted Average Borrowing Rates | 60 to 89 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.29%	5.58%
Repurchase Agreements | Weighted Average Borrowing Rates | 90 to 119 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.25%	6.38%
Repurchase Agreements | Weighted Average Borrowing Rates | 120 to 180 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.75%	6.15%
Repurchase Agreements | Weighted Average Borrowing Rates | 180 days to 1 year
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	6.70%	6.79%
Repurchase Agreements | Weighted Average Borrowing Rates | 1 to 2 years
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	8.31%
Repurchase Agreements | Weighted Average Borrowing Rates | 2 to 3 years
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.01%	5.02%
Repurchase Agreements | Minimum | 1 to 29 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	4.46%	4.66%
Repurchase Agreements | Minimum | 30 to 59 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.04%	5.34%
Repurchase Agreements | Minimum | 60 to 89 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	4.72%	4.87%
Repurchase Agreements | Minimum | 90 to 119 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.25%	5.51%
Repurchase Agreements | Minimum | 120 to 180 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.24%	5.82%
Repurchase Agreements | Minimum | 180 days to 1 year
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.61%	5.80%
Repurchase Agreements | Minimum | 1 to 2 years
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	8.15%
Repurchase Agreements | Minimum | 2 to 3 years
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.01%	5.02%
Repurchase Agreements | Maximum | 1 to 29 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	7.20%	7.52%
Repurchase Agreements | Maximum | 30 to 59 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	6.80%	12.50%
Repurchase Agreements | Maximum | 60 to 89 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.65%	7.02%
Repurchase Agreements | Maximum | 90 to 119 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	5.25%	6.77%
Repurchase Agreements | Maximum | 120 to 180 days
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	6.54%	6.77%
Repurchase Agreements | Maximum | 180 days to 1 year
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	7.47%	7.49%
Repurchase Agreements | Maximum | 1 to 2 years
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	8.57%
Repurchase Agreements | Maximum | 2 to 3 years
Assets Sold under Agreements to Repurchase [Line Items]
Borrowing rates (as a percent)	6.09%	5.02%