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Fair Value of Financial Instruments - Schedule of Carrying Value and Estimated Fair Value of the Company's Financial Assets and Liabilities (Details) - USD ($)	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024
Financial Assets:
Cash and cash equivalents	$ 160,447,000		$ 167,422,000	$ 235,514,000
Equity investments, carrying value	91,440,000		113,492,000
Derivative asset, carrying value	374,000		56,000
Mortgage servicing rights, fair value	19,449,000	$ 20,297,000	21,003,000	0
Collateralized debt obligations:
Subordinated debentures, carrying value	45,000,000		45,000,000
Senior unsecured notes:
Senior unsecured notes, carrying value	236,384,000		159,196,000
Mortgages payable on real estate, carrying value	652,994,000
Fair Value, Measurements, Recurring
Financial Assets:
Equity investment, estimated fair value	91,440,000		113,492,000
VIE, Primary Beneficiary
Financial Assets:
Residential loans, carrying value	247,405,000			285,057,000
Collateralized debt obligations:
Carrying Value	235,226,000			$ 275,200,000
VIE, Primary Beneficiary | Mortgages
Senior unsecured notes:
Mortgages payable on real estate, carrying value	364,100,000		366,606,000
Residential loan securitizations at amortized cost, net
Collateralized debt obligations:
Carrying Value	738,121,000		842,764,000
Residential loan securitizations at amortized cost, net | VIE, Primary Beneficiary
Collateralized debt obligations:
Carrying Value	738,121,000		2,135,680,000
Consolidated SLST
Collateralized debt obligations:
Carrying Value	2,626,479,000		2,135,680,000
Consolidated SLST | VIE, Primary Beneficiary
Collateralized debt obligations:
Carrying Value	2,626,479,000		842,764,000
Senior unsecured notes at amortized cost, net
Senior unsecured notes:
Senior unsecured notes, carrying value	98,966,000		98,886,000
Senior unsecured notes at fair value
Senior unsecured notes:
Senior unsecured notes, carrying value	137,418,000		60,310,000
Level 1 | Fair Value, Measurements, Recurring
Financial Assets:
Cash and cash equivalents	160,447,000		167,422,000
Cash and cash equivalents, estimated fair value	160,447,000		167,422,000
Equity investment, estimated fair value	0		0
Level 3 | Fair Value, Measurements, Recurring
Financial Assets:
Equity investments, carrying value	91,440,000		113,492,000
Equity investment, estimated fair value	91,440,000		113,492,000
Collateralized debt obligations:
Subordinated debentures, carrying value	45,000,000		45,000,000
Subordinated debentures, estimated fair value	37,818,000		38,918,000
Level 3 | Mortgages | Fair Value, Measurements, Recurring
Financial Assets:
Mortgage servicing rights, carrying value	19,449,000		21,003,000
Mortgage servicing rights, fair value	19,449,000		21,003,000
Senior unsecured notes:
Mortgages payable on real estate, carrying value	364,100,000		366,606,000
Mortgages payable on real estate, estimated fair value	354,180,000		347,915,000
Mortgages payable on real estate in disposal group held for sale, carrying value	89,422,000		93,370,000
Mortgages payable on real estate in disposal group held for sale, estimated fair value	89,422,000		93,370,000
Level 3 | Residential loan securitizations at amortized cost, net | Fair Value, Measurements, Recurring
Collateralized debt obligations:
Carrying Value	738,121,000		842,764,000
Collateralized debt obligations, fair value	722,483,000		818,482,000
Level 3 | Consolidated SLST | VIE, Primary Beneficiary | Fair Value, Measurements, Recurring
Collateralized debt obligations:
Carrying Value	1,031,897,000		811,591,000
Collateralized debt obligations, fair value	1,031,897,000		811,591,000
Level 3 | Residential loans | Fair Value, Measurements, Recurring
Financial Assets:
Residential loans, carrying value	4,026,027,000		3,841,738,000
Residential mortgage loans at fair value	4,026,027,000		3,841,738,000
Level 3 | Multi-family loans | Fair Value, Measurements, Recurring
Financial Assets:
Multi-family loans, carrying value	74,999,000		86,192,000
Multi-family loans, estimated fair value	74,999,000		86,192,000
Level 2 | Fair Value, Measurements, Recurring
Financial Assets:
Investment securities available for sale:	5,109,601,000		3,828,544,000
Equity investment, estimated fair value	0		0
Derivative asset, carrying value	374,000		56,000
Derivative asset, estimated fair value	374,000		56,000
Derivative assets in disposal group held for sale, carrying value	58,000		67,000
Derivative assets in disposal group held for sale, estimated fair value	$ 58,000		$ 67,000
Senior unsecured notes:
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets		Other assets
Level 2 | Repurchase agreements | Fair Value, Measurements, Recurring
Financial Liabilities:
Repurchase agreements	$ 4,907,436,000		$ 4,012,225,000
Level 2 | Residential loan securitizations at amortized cost, net | Fair Value, Measurements, Recurring
Collateralized debt obligations:
Residential loan securitizations at fair value, carrying value	1,526,481,000		1,253,332,000
Residential loan securitizations at fair value	1,526,481,000		1,253,332,000
Level 2 | Non-Agency RMBS re-securitization | VIE, Primary Beneficiary | Fair Value, Measurements, Recurring
Collateralized debt obligations:
Carrying Value	68,101,000		70,757,000
Collateralized debt obligations, fair value	68,101,000		70,757,000
Level 2 | Senior unsecured notes at amortized cost, net | Fair Value, Measurements, Recurring
Senior unsecured notes:
Senior unsecured notes, carrying value	98,966,000		98,886,000
Senior unsecured notes, estimated fair value	97,633,000		98,632,000
Level 2 | Senior unsecured notes at fair value | Fair Value, Measurements, Recurring
Senior unsecured notes:
Senior unsecured notes, carrying value	137,418,000		60,310,000
Senior unsecured notes, estimated fair value	137,418,000		60,310,000
Assets of disposal group held for sale | Level 3 | Fair Value, Measurements, Recurring
Financial Assets:
Equity investments, carrying value	500,000		0
Equity investment, estimated fair value	$ 500,000		$ 0

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