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Repurchase Agreements - Narrative (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) counterparty	Dec. 31, 2023 USD ($) counterparty	Sep. 30, 2023 USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Cash and cash equivalents	$ 195,066	$ 187,107	$ 228,333
Securities borrowed	$ 203,726
Number of counterparties with amounts outstanding under repurchase agreements | counterparty	8	7
Repurchase agreements, number of counterparties | counterparty	5
Financings under repurchase agreements, aggregate outstanding balance	$ 526,800
Accrued interest payable	$ 19,800	$ 13,600
Weighted average advance rate	95.70%	93.40%
Average interest rate haircut	4.30%	6.60%
Average days to maturity	45 days	46 days
Weighted average interest rate	5.23%	5.66%
Interest Rate Caps
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, number of counterparties | counterparty	1
Residential Loans
Assets Sold under Agreements to Repurchase [Line Items]
Securities borrowed	$ 107,200
Number of counterparties with amounts outstanding under repurchase agreements | counterparty	6
Residential Loans, Real Estate Owned and Single-Family Rental Properties
Assets Sold under Agreements to Repurchase [Line Items]
Accrued interest payable	$ 4,300	$ 3,700
Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Securities borrowed	$ 160,476
Average interest rate haircut	4.20%
Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Securities borrowed	$ 43,250
Average interest rate haircut	26.00%
U.S. Treasury securities
Assets Sold under Agreements to Repurchase [Line Items]
Average interest rate haircut	1.40%
Repurchase Agreements
Assets Sold under Agreements to Repurchase [Line Items]
Cash and cash equivalents	$ 188,900
Securities borrowed	$ 203,700
Atlas SP
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreement percentage at risk	6.84%

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount, after the effects of master netting arrangements, of securities borrowed from entities in exchange for collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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