Fair value measurements - Schedule of Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Securitized Debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (6,749,708)	$ (5,836,691)	$ (7,177,923)	$ (5,491,967)
Purchases	0	0	0	0
Capital distributions	0		0
Issuances of Securitized Debt		(314,660)		(723,330)
Proceeds from sales or settlements	0	0	0	0
Principal repayments	388,941	212,374	752,082	383,149
Principal funding	0	0	0	0
Included in net income:
Other	0	0	0	0
Ending Balance	(6,355,237)	(5,937,637)	(6,355,237)	(5,937,637)
Securitized Debt \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
Securitized Debt \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(2,910)	(6,650)	(6,032)	(13,457)
Securitized Debt \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
Securitized Debt \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	8,440	7,990	76,636	(92,032)
Other Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		0		(336)
Purchases		0		0
Issuances of Securitized Debt		0		0
Proceeds from sales or settlements		0		298
Principal repayments		0		0
Principal funding		0		0
Included in net income:
Other		0		0
Ending Balance		(51)		(51)
Other Liabilities \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0		0
Other Liabilities \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0		0
Other Liabilities \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0		(298)
Other Liabilities \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		(51)		285
Level 3 \| Securitized Debt \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0		0
Level 3 \| Securitized Debt \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(2,910)	(6,650)	(6,032)	(13,457)
Level 3 \| Securitized Debt \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		7,990		(92,032)
Level 3 \| Securitized Debt \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	8,440	0	76,636	0
Level 3 \| Other Liabilities \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0		0
Level 3 \| Other Liabilities \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		(51)		(51)
Level 3 \| Other Liabilities \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0		0
Residential Mortgage Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	7,766,335	6,809,796	8,198,215	6,416,066
Purchases	70,009	444,852	156,746	939,621
Capital distributions	0		0
Issuances of Securitized Debt		0		0
Proceeds from sales or settlements	(26,331)	(37,333)	(75,706)	(57,761)
Principal repayments	(417,214)	(234,788)	(804,038)	(422,385)
Principal funding	5,505	4,572	9,568	6,953
Included in net income:
Other	(3,433)	(2,199)	(7,777)	(6,261)
Ending Balance	7,380,650	6,974,999	7,380,650	6,974,999
Residential Mortgage Loans \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
Residential Mortgage Loans \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(2,216)	2,214	(4,612)	4,105
Residential Mortgage Loans \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(1,458)	(655)	(1,518)	(1,722)
Residential Mortgage Loans \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(10,547)	(11,460)	(90,228)	96,383
Residential Mortgage Loans \| Level 3 \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0		0
Residential Mortgage Loans \| Level 3 \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(2,252)	2,219	(4,541)	4,064
Residential Mortgage Loans \| Level 3 \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		(11,437)		95,526
Residential Mortgage Loans \| Level 3 \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(11,945)	0	(91,977)	0
Legacy WMC Commercial Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	51,504	65,504	55,376	67,005
Purchases	0	0	0	0
Capital distributions	0		0
Issuances of Securitized Debt		0		0
Proceeds from sales or settlements	0	0	0	0
Principal repayments	(1,343)	0	(1,343)	0
Principal funding	0	0	0	0
Included in net income:
Other	0	0	0	0
Ending Balance	49,254	64,883	49,254	64,883
Legacy WMC Commercial Loans \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
Legacy WMC Commercial Loans \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(2,526)	63	(2,919)	333
Legacy WMC Commercial Loans \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
Legacy WMC Commercial Loans \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	1,619	(684)	(1,860)	(2,455)
Legacy WMC Commercial Loans \| Level 3 \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0		0
Legacy WMC Commercial Loans \| Level 3 \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(2,526)	63	(2,919)	333
Legacy WMC Commercial Loans \| Level 3 \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		(684)		(2,455)
Legacy WMC Commercial Loans \| Level 3 \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	1,619	0	(1,860)	0
Non-Agency RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	211,564	141,118	191,546	115,533
Purchases	37,737	0	66,388	25,963
Capital distributions	0		0
Issuances of Securitized Debt		0		0
Proceeds from sales or settlements	0	0	0	0
Principal repayments	(7,464)	(2,608)	(13,369)	(3,702)
Principal funding	0	0	0	0
Included in net income:
Other	0	0	0	0
Ending Balance	241,893	137,945	241,893	137,945
Non-Agency RMBS \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
Non-Agency RMBS \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(1,134)	(826)	(1,913)	(1,518)
Non-Agency RMBS \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
Non-Agency RMBS \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	1,190	261	(759)	1,669
Non-Agency RMBS \| Level 3 \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0		0
Non-Agency RMBS \| Level 3 \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	(1,134)	(826)	(1,913)	(1,518)
Non-Agency RMBS \| Level 3 \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		261		1,669
Non-Agency RMBS \| Level 3 \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	1,190	0	(759)	0
Other Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		0	0	204
Purchases		0	0	0
Capital distributions			0
Issuances of Securitized Debt		0		0
Proceeds from sales or settlements		0	(2)	(258)
Principal repayments		0	0	0
Principal funding		0	0	0
Included in net income:
Other		0	0	0
Ending Balance	0	511	0	511
Other Assets \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0	0	0
Other Assets \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0	0	0
Other Assets \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0	2	258
Other Assets \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		511	0	307
Other Assets \| Level 3 \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held			0
Other Assets \| Level 3 \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0	0	0
Other Assets \| Level 3 \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		511		511
Other Assets \| Level 3 \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0	0	0
AG Arc
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	52,334	32,242	50,016	30,778
Purchases	0	0	0	0
Capital distributions	(6,614)		(6,614)
Issuances of Securitized Debt		0		0
Proceeds from sales or settlements	0	0	0	0
Principal repayments	0	0	0	0
Principal funding	0	0	0	0
Included in net income:
Other	0	0	0	0
Ending Balance	46,435	32,205	46,435	32,205
AG Arc \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	715	(37)	3,033	1,427
AG Arc \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
AG Arc \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
AG Arc \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
AG Arc \| Level 3 \| Income Statement Location [Axis]: us-gaap:IncomeLossFromEquityMethodInvestments
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	715		3,033
AG Arc \| Level 3 \| Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	0	0	0	0
AG Arc \| Level 3 \| Income Statement Location [Axis]: mitt:InvestmentAndDerivativeRealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held		0		0
AG Arc \| Level 3 \| Income Statement Location [Axis]: mitt:InvestmentUnrealizedGainLossFVO
Included in net income:
Change in unrealized appreciation/(depreciation) for level 3 assets/liabilities still held	$ 0	$ (37)	$ 0	$ 1,427

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Distributions

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- Definition

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Other

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Principal Funding

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- Definition

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Distributions

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Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Other

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Principal Funding

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- Definition

Total Liability Gain (Loss)

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No definition available.

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- Definition

Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
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- Definition

Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Topic 820
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