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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 ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financial Assets:
Cash and cash equivalents	$ 195,066	$ 187,107	$ 228,333
Equity Investments, carrying value	146,833	147,116
Derivative Asset, carrying value	1,481	6,510
Collateralized debt obligations:
Subordinated debentures, carrying value	45,000	45,000
Senior unsecured notes:
Senior unsecured notes, carrying value	159,587	$ 98,111
Mortgages payable on real estate, carrying value	$ 699,396
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Fair Value, Measurements, Recurring
Financial Assets:
Equity Investment, estimated fair value	$ 146,833	$ 147,116
VIE, Primary Beneficiary
Financial Assets:
Residential loans, carrying value	285,057
Collateralized debt obligations:
Carrying Value	275,200
VIE, Primary Beneficiary | Mortgages
Senior unsecured notes:
Mortgages payable on real estate, carrying value	492,321	784,421
Residential loan securitizations at amortized cost, net
Collateralized debt obligations:
Carrying Value	902,038	1,276,780
Residential loan securitizations at amortized cost, net | VIE, Primary Beneficiary
Collateralized debt obligations:
Carrying Value	902,038	1,276,780
Consolidated SLST
Collateralized debt obligations:
Carrying Value	1,900,228	593,737
Consolidated SLST | VIE, Primary Beneficiary
Collateralized debt obligations:
Carrying Value	1,900,228	593,737
Senior unsecured notes at amortized cost, net
Senior unsecured notes:
Senior unsecured notes, carrying value	98,687	98,111
Senior unsecured notes at fair value
Senior unsecured notes:
Senior unsecured notes, carrying value	60,900
Level 1 | Fair Value, Measurements, Recurring
Financial Assets:
Cash and cash equivalents	195,066	187,107
Cash and cash equivalents, estimated fair value	195,066	187,107
Equity Investment, estimated fair value	0	0
Level 3 | Fair Value, Measurements, Recurring
Financial Assets:
Equity Investments, carrying value	146,833	147,116
Equity Investment, estimated fair value	146,833	147,116
Collateralized debt obligations:
Subordinated debentures, carrying value	45,000	45,000
Subordinated debentures, estimated fair value	39,198	32,137
Level 3 | Mortgages | Fair Value, Measurements, Recurring
Senior unsecured notes:
Mortgages payable on real estate, carrying value	492,321	784,421
Mortgages payable on real estate, estimated fair value	482,215	761,194
Mortgages payable on real estate in disposal group held for sale, carrying value	170,318	378,386
Mortgages payable on real estate in disposal group held for sale, estimated fair value	170,318	377,735
Level 3 | Residential loan securitizations at amortized cost, net | Fair Value, Measurements, Recurring
Collateralized debt obligations:
Carrying Value	902,038	1,276,780
Collateralized debt obligations, fair value	885,478	1,237,531
Level 3 | Consolidated SLST | VIE, Primary Beneficiary | Fair Value, Measurements, Recurring
Collateralized debt obligations:
Carrying Value	845,811	593,737
Collateralized debt obligations, fair value	845,811	593,737
Level 3 | Residential loans | Fair Value, Measurements, Recurring
Financial Assets:
Residential loans, carrying value	3,777,144	3,084,303
Residential mortgage loans at fair value	3,777,144	3,084,303
Level 3 | Multi-family loans | Fair Value, Measurements, Recurring
Financial Assets:
Preferred equity and mezzanine loan investments, carrying value	87,614	95,792
Preferred equity and mezzanine loan investments, estimated fair value	87,614	95,792
Level 2 | Fair Value, Measurements, Recurring
Financial Assets:
Investment securities available for sale:	3,385,270	2,013,817
Equity Investment, estimated fair value	0	0
Derivative Asset, carrying value	1,481	6,510
Derivative Asset, estimated fair value	1,481	6,510
Derivative assets in disposal group held for sale, carrying value	308	2,960
Derivative assets in disposal group held for sale, estimated fair value	308	2,960
Level 2 | Repurchase agreements | Fair Value, Measurements, Recurring
Financial Liabilities:
Repurchase agreements	3,611,115	2,471,113
Level 2 | Residential loan securitizations at amortized cost, net | Fair Value, Measurements, Recurring
Collateralized debt obligations:
Residential loan securitizations at fair value, carrying value	981,779	0
Residential loan securitizations at fair value	981,779	0
Level 2 | Non-Agency RMBS re-securitization | VIE, Primary Beneficiary | Fair Value, Measurements, Recurring
Collateralized debt obligations:
Carrying Value	72,638	0
Collateralized debt obligations, fair value	72,638	0
Level 2 | Senior unsecured notes at amortized cost, net | Fair Value, Measurements, Recurring
Senior unsecured notes:
Senior unsecured notes, carrying value	98,687	98,111
Senior unsecured notes, estimated fair value	99,088	94,952
Level 2 | Senior unsecured notes at fair value | Fair Value, Measurements, Recurring
Senior unsecured notes:
Senior unsecured notes, carrying value	60,900	0
Senior unsecured notes, estimated fair value	$ 60,900	$ 0

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