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Repurchase Agreements - Narrative (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) counterparty	Dec. 31, 2022 USD ($) counterparty	Sep. 30, 2022 USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Cash and cash equivalents	$ 228,333	$ 244,718	$ 355,276
Number of counterparties with amounts outstanding under repurchase agreements | counterparty	6	1
Repurchase agreements, number of counterparties | counterparty	2
Financings under repurchase agreements, aggregate outstanding balance	$ 335,700
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]
Number of counterparties with amounts outstanding under repurchase agreements | counterparty	5
Repurchase agreements
Assets Sold under Agreements to Repurchase [Line Items]
Cash and cash equivalents	$ 221,200
Securities borrowed	$ 172,761
Weighted average advance rate	92.90%	30.00%
Average interest rate haircut	7.10%	70.00%
Average days to maturity	52 days	9 days
Weighted average interest rate	5.61%	5.28%
Accrued interest payable	$ 9,200	$ 600
Repurchase agreements | Residential loans
Assets Sold under Agreements to Repurchase [Line Items]
Securities borrowed	201,200
Accrued interest payable	2,800	$ 3,600
Repurchase agreements | Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Securities borrowed	$ 47,610
Average interest rate haircut	4.80%
Repurchase agreements | Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Securities borrowed	$ 119,503
Average interest rate haircut	46.90%
Atlas SP
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreement percentage at risk	7.91%
Bank of America
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreement percentage at risk	5.68%

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Number of counterparties the entity has repurchase agreements with.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Weighted average maturity (weighted by amount of the agreement) of repurchase agreements with the counterparty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt.

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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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