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Repurchase Agreements - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($) counterparty financialInstitution	Dec. 31, 2022 USD ($) counterparty	Mar. 31, 2022 USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Cash and cash equivalents	$ 227,753,000	$ 244,718,000	$ 303,762,000
Repurchase agreements, number of financial institutions | financialInstitution	4
Repurchase agreements, number of counterparties | counterparty	1
Financings under repurchase agreements, aggregate outstanding balance	$ 245,000,000
Number of counterparties with amounts outstanding under repurchase agreements | counterparty	3	3
Interest rate caps
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, number of counterparties | counterparty	1
Interest rate	4.10%
Notional Amount	$ 111,000,000
Fair value of the interest rate cap contract	1,200,000	$ 1,500,000
Unrealized losses	$ 200,000
Bank of America
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreement percentage at risk	6.88%
Repurchase agreements
Assets Sold under Agreements to Repurchase [Line Items]
Cash and cash equivalents	$ 215,800,000
Unencumbered investment securities	$ 127,498,000
Weighted average advance rate	76.60%	30.00%
Average interest rate haircut	23.40%	70.00%
Average days to maturity	55 days	9 days
Weighted average interest rate	5.74%	5.28%
Accrued interest payable	$ 1,300,000	$ 600,000
Repurchase agreements | Residential loans
Assets Sold under Agreements to Repurchase [Line Items]
Unencumbered investment securities	225,300,000
Repurchase agreements | Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Unencumbered investment securities	$ 6,914,000
Average interest rate haircut	5.00%
Repurchase agreements | Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Unencumbered investment securities	$ 89,425,000
Average interest rate haircut	36.50%

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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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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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