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Financing - Summary of financing arrangements (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
Repurchase Agreements [Abstract] |  |
Current Face | $ 8,243,031,000 |
Carrying Value | $ 8,100,775,000 | $ 6,329,796,000
Weighted Average Funding Cost | 5.44% |
Weighted Average Life (in years) | 5 years 18 days |
Cash pledged (i.e., restricted cash) under repurchase agreements | $ 7,800,000 | 10,600,000
Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | 1,253,086,000 |
February 2029 Senior Unsecured Notes |  |
Repurchase Agreements [Abstract] |  |
Carrying Value | 33,327,000 |
May 2029 Senior Unsecured Notes |  |
Repurchase Agreements [Abstract] |  |
Carrying Value | 63,131,000 |
Securitized Residential Mortgage Loans | Securitized Debt |  |
Repurchase Agreements [Abstract] |  |
Current Face | 7,317,137,000 |
Carrying Value | $ 7,177,923,000 | 5,491,967,000
Weighted Average Funding Cost | 5.39% |
Weighted Average Life (in years) | 5 years 5 months 1 day |
Total Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | $ 826,394,000 |
Total Financing Arrangements | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 826,394,000 |
Carrying Value | $ 826,394,000 | 742,108,000
Weighted Average Funding Cost | 5.27% |
Weighted Average Life (in years) | 2 months 12 days |
Total Financing Arrangements | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 1,253,086,000 |
Non-Agency Loans |  |
Repurchase Agreements [Abstract] |  |
Current Face | 29,817,000 |
Non-Agency Loans | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 29,817,000 |
Carrying Value | $ 29,817,000 | 7,615,000
Weighted Average Funding Cost | 5.73% |
Weighted Average Life (in years) | 5 months 8 days |
Non-Agency Loans | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 35,108,000 |
Non-Agency Loans | Securitized Residential Mortgage Loans |  |
Repurchase Agreements [Abstract] |  |
Current Face | 428,657,000 |
Non-Agency Loans | Securitized Residential Mortgage Loans | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 428,657,000 |
Carrying Value | $ 428,657,000 | 370,913,000
Weighted Average Funding Cost | 5.28% |
Weighted Average Life (in years) | 1 month 28 days |
Non-Agency Loans | Securitized Residential Mortgage Loans | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 641,399,000 |
Non-Agency Loans | Securitized Residential Mortgage Loans | Securitized Debt |  |
Repurchase Agreements [Abstract] |  |
Current Face | 6,432,326,000 |
Carrying Value | $ 6,265,540,000 | 5,391,413,000
Weighted Average Funding Cost | 5.37% |
Weighted Average Life (in years) | 5 years 8 months 23 days |
Non-Agency Loans | Counterparty One and Two |  |
Repurchase Agreements [Abstract] |  |
Line of credit facility, maximum borrowing capacity | $ 1,600,000,000 |
Maximum borrowing capacity committed by lender | 50,000,000 |
Home Equity Loans |  |
Repurchase Agreements [Abstract] |  |
Current Face | 58,951,000 |
Home Equity Loans | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 58,951,000 |
Carrying Value | $ 58,951,000 | 87,440,000
Weighted Average Funding Cost | 6.27% |
Weighted Average Life (in years) | 5 months 19 days |
Line of credit facility, maximum borrowing capacity | $ 50,000,000 |
Fair value of collateral pledged | 69,700,000 |
Unpaid Principal Balance | 66,800,000 |
Outstanding financing | $ 0 |
Advance rate, percentage of unpaid principal balance | 87.50% |
Home Equity Loans | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 142,339,000 |
Home Equity Loans | Securitized Residential Mortgage Loans |  |
Repurchase Agreements [Abstract] |  |
Current Face | 67,752,000 |
Notional balance | 295,400,000 |
Home Equity Loans | Securitized Residential Mortgage Loans | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 67,752,000 |
Carrying Value | $ 67,752,000 | 0
Weighted Average Funding Cost | 4.67% |
Weighted Average Life (in years) | 1 month 9 days |
Home Equity Loans | Securitized Residential Mortgage Loans | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 84,064,000 |
Home Equity Loans | Securitized Residential Mortgage Loans | Securitized Debt |  |
Repurchase Agreements [Abstract] |  |
Current Face | 784,881,000 |
Carrying Value | $ 817,889,000 | 0
Weighted Average Funding Cost | 5.81% |
Weighted Average Life (in years) | 2 years 7 months 20 days |
Re- and Non-Performing Loans | Securitized Residential Mortgage Loans |  |
Repurchase Agreements [Abstract] |  |
Current Face | $ 27,264,000 |
Re- and Non-Performing Loans | Securitized Residential Mortgage Loans | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 27,264,000 |
Carrying Value | $ 27,264,000 | 31,798,000
Weighted Average Funding Cost | 5.89% |
Weighted Average Life (in years) | 25 days |
Re- and Non-Performing Loans | Securitized Residential Mortgage Loans | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 41,438,000 |
Re- and Non-Performing Loans | Securitized Residential Mortgage Loans | Securitized Debt |  |
Repurchase Agreements [Abstract] |  |
Current Face | 99,930,000 |
Carrying Value | $ 94,494,000 | 100,554,000
Weighted Average Funding Cost | 3.45% |
Weighted Average Life (in years) | 3 years 3 months 7 days |
Agency-Eligible Loans |  |
Repurchase Agreements [Abstract] |  |
Current Face | $ 19,490,000 |
Agency-Eligible Loans | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 19,490,000 |
Carrying Value | $ 19,490,000 | 95,688,000
Weighted Average Funding Cost | 5.43% |
Weighted Average Life (in years) | 10 months 13 days |
Agency-Eligible Loans | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 21,149,000 |
Legacy WMC Commercial loans | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 27,436,000 |
Carrying Value | $ 27,436,000 | 47,222,000
Weighted Average Funding Cost | 6.73% |
Weighted Average Life (in years) | 2 months 23 days |
Legacy WMC Commercial loans | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 55,376,000 |
Non-Agency RMBS |  |
Repurchase Agreements [Abstract] |  |
Current Face | 137,386,000 |
Non-Agency RMBS | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 137,386,000 |
Carrying Value | $ 137,386,000 | 78,978,000
Weighted Average Funding Cost | 4.64% |
Weighted Average Life (in years) | 1 month 20 days |
Non-Agency RMBS | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 173,891,000 |
Legacy WMC CMBS |  |
Repurchase Agreements [Abstract] |  |
Current Face | 18,540,000 |
Unpaid Principal Balance | 23,500,000 | 23,500,000
Legacy WMC CMBS | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 18,540,000 |
Carrying Value | $ 18,540,000 | 20,416,000
Weighted Average Funding Cost | 5.29% |
Weighted Average Life (in years) | 1 month 28 days |
Legacy WMC CMBS | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 42,538,000 |
Agency RMBS |  |
Repurchase Agreements [Abstract] |  |
Current Face | 10,857,000 |
Agency RMBS | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 10,857,000 |
Carrying Value | $ 10,857,000 | 2,038,000
Weighted Average Funding Cost | 4.32% |
Weighted Average Life (in years) | 2 months 12 days |
Agency RMBS | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 15,465,000 |
Other assets |  |
Repurchase Agreements [Abstract] |  |
Current Face | 244,000 |
Other assets | Financing Arrangements |  |
Repurchase Agreements [Abstract] |  |
Current Face | 244,000 |
Carrying Value | $ 244,000 | 0
Weighted Average Funding Cost | 5.73% |
Weighted Average Life (in years) | 5 months 8 days |
Other assets | Financing Arrangements | Asset Pledged as Collateral |  |
Repurchase Agreements [Abstract] |  |
Collateral Fair Value | $ 319,000 |
Senior Notes |  |
Repurchase Agreements [Abstract] |  |
Current Face | 99,500,000 |
Carrying Value | $ 96,458,000 | 95,721,000
Weighted Average Funding Cost | 10.61% |
Weighted Average Life (in years) | 3 years 3 months 29 days |
Long-term debt, fair value | $ 101,700,000 |
February 2029 Senior Unsecured Notes |  |
Repurchase Agreements [Abstract] |  |
Current Face | $ 34,500,000 |
Carrying Value |  | 33,028,000
Weighted Average Funding Cost | 10.79% |
Weighted Average Life (in years) | 3 years 2 months 1 day |
May 2029 Senior Unsecured Notes |  |
Repurchase Agreements [Abstract] |  |
Current Face | $ 65,000,000 |
Carrying Value |  | $ 62,693,000
Weighted Average Funding Cost | 10.52% |
Weighted Average Life (in years) | 3 years 5 months 1 day |
Interest Only | Securitized Residential Mortgage Loans |  |
Repurchase Agreements [Abstract] |  |
Notional balance | $ 3,700,000,000 |

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- Definition Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + 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/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -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/2009/role/commonPracticeRef -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/2009/role/commonPracticeRef -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/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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