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Financing Agreements - Financing Agreements (Details) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
	Jun. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Financing Agreements [Line Items]
Unpaid Principal Balance		$ 8,296,145	$ 7,043,944
Fair Value / Carrying Value		$ 8,037,973	$ 6,812,086
Weighted Average Cost of Funding (in Percent)		4.18%	3.70%
Agreements with mark-to-market collateral provisions
Financing Agreements [Line Items]
Unpaid Principal Balance		$ 2,362,351	$ 2,223,298
Fair Value / Carrying Value		$ 2,361,488	$ 2,223,047
Weighted Average Cost of Funding (in Percent)		7.17%	5.73%
Agreements with mark-to-market collateral provisions | 0-3 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		$ 1,428,655
Agreements with mark-to-market collateral provisions | 3-6 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		128,124
Agreements with mark-to-market collateral provisions | 6-12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		465,641
Fair Value / Carrying Value		$ 339,900
Extension period		1 year
Agreements with mark-to-market collateral provisions | Greater than 12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		$ 339,931
Fair Value / Carrying Value		831,200
Agreements with mark-to-market collateral provisions | Estimated Fair Value
Financing Agreements [Line Items]
Financing agreements, amortized cost		505,700	$ 578,900
Agreements with mark-to-market collateral provisions | Estimated Fair Value | Held at Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value			578,900
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO
Financing Agreements [Line Items]
Unpaid Principal Balance		1,753,355	2,111,647
Fair Value / Carrying Value		$ 1,752,492	$ 2,111,396
Weighted Average Cost of Funding (in Percent)		7.55%	5.74%
Weighted Average Term to Maturity (Months)	6 months 27 days	10 months 12 days
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO | 0-3 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		$ 819,659
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO | 3-6 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		128,124
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO | 6-12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		465,641
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO | Greater than 12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		339,931
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO | Not Held at Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value		505,700
Agreements with mark-to-market collateral provisions | Securities
Financing Agreements [Line Items]
Unpaid Principal Balance		608,996	$ 111,651
Fair Value / Carrying Value		$ 608,996	$ 111,651
Weighted Average Cost of Funding (in Percent)		5.83%	5.47%
Weighted Average Term to Maturity (Months)	1 month 15 days	9 days
Agreements with mark-to-market collateral provisions | Securities | 0-3 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		$ 608,996
Agreements with mark-to-market collateral provisions | Securities | 3-6 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		0
Agreements with mark-to-market collateral provisions | Securities | 6-12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		0
Agreements with mark-to-market collateral provisions | Securities | Greater than 12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		0
Agreements with Non-mark-to-market Collateral Provisions | Estimated Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value			$ 884,500
Financing agreements, amortized cost		401,400	884,500
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO
Financing Agreements [Line Items]
Unpaid Principal Balance		1,125,773	1,004,260
Fair Value / Carrying Value		$ 1,124,953	$ 1,003,604
Weighted Average Cost of Funding (in Percent)		7.88%	6.53%
Weighted Average Term to Maturity (Months)	16 months 24 days	14 months 9 days
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO | 0-3 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		$ 447,996
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO | 3-6 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		0
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO | 6-12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		27,367
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO | Greater than 12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance		650,410
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO | Held at Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value		$ 401,400
Securities | Estimated Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value			$ 2,400,000
Weighted Average Cost of Funding (in Percent)		(1.41%)	(0.84%)
Financing agreements, amortized cost		$ 3,700,000	$ 2,600,000
Securities | Residential Whole Loans and REO
Financing Agreements [Line Items]
Unpaid Principal Balance		4,588,432	3,586,397
Fair Value / Carrying Value		$ 4,332,936	$ 3,357,590
Weighted Average Cost of Funding (in Percent)		3.98%	3.33%
Securities | Residential Whole Loans and REO | Held at Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value		$ 3,500,000
Convertible senior notes | Unsecured
Financing Agreements [Line Items]
Unpaid Principal Balance			$ 229,989
Fair Value / Carrying Value		$ 218,596	$ 227,845
Weighted Average Cost of Funding (in Percent)		6.94%	6.94%
Weighted Average Term to Maturity (Months)	17 months 15 days	8 months 15 days
Impact of net Swap carry | Unsecured
Financing Agreements [Line Items]
Unpaid Principal Balance
Fair Value / Carrying Value
Weighted Average Cost of Funding (in Percent)		(1.41%)	(0.84%)

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