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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
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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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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- Definition Fair value portion 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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