Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

Name:	us-gaap_DebtDefaultLongtermDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Financings - Narrative (Details)	1 Months Ended		3 Months Ended		6 Months Ended
Financings - Narrative (Details)	Sep. 30, 2021 USD ($)	May 31, 2019 USD ($)	Jun. 30, 2022 USD ($) item agreement $ / shares	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($) item agreement $ / shares	Feb. 28, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)
Debt Instrument [Line Items]
Number of longer term financial arrangements company entered to reduce its exposure to short term financings \| agreement			3		3
Commercial loans, at fair value			$ 101,487,000		$ 101,487,000		$ 101,459,000
Number of counterparties from whom entity borrowed under repurchase agreement \| item			5		5
Assets Pledged			$ 5,095,000		$ 5,095,000		5,207,000
Securities loaned, collateral, right to reclaim cash			784,000		784,000		3,200,000
Securities purchased under agreements to resell, collateral, obligation to return cash			360,000		$ 360,000		0
Redeemable period					3 months
Stock repurchased			$ 7,200,000	$ 3,400,000
Repurchase at premium, percentage			0.60%	0.80%	0.60%
Repurchase agreements, net			$ 555,076,000		$ 555,076,000		617,189,000
Repurchase agreements
Debt Instrument [Line Items]
Assets Pledged			708,500,000		708,500,000		787,100,000
Commercial Loans \| Repurchase agreements
Debt Instrument [Line Items]
Assets Pledged			$ 101,487,000		$ 101,487,000		$ 101,459,000
Repurchase agreements
Debt Instrument [Line Items]
Weighted average interest rate			3.23%		3.23%		2.24%
Repurchase agreements \| Commercial Loans
Debt Instrument [Line Items]
Weighted average interest rate			2.64%		2.64%		2.27%
Arroyo Trust \| Secured Debt
Debt Instrument [Line Items]
Fair value			$ 254,141,000		$ 254,141,000
Debt instrument, face amount			257,197,000		257,197,000
Arroyo Mortgage Trust 2020 \| Secured Debt
Debt Instrument [Line Items]
Fair value			134,178,000		134,178,000
Debt instrument, face amount			135,966,000		135,966,000
Arroyo Mortgage Trust 2022 \| Secured Debt
Debt Instrument [Line Items]
Fair value			341,768,000		341,768,000
Debt instrument, face amount			373,586,000		373,586,000
CSMC Trust
Debt Instrument [Line Items]
Trust certificates issued			1,400,000,000		1,400,000,000
Principal			1,385,591,000		1,385,591,000		$ 1,385,591,000
CSMC Trust \| Affiliated Entity
Debt Instrument [Line Items]
Trust certificates issued			198,300,000		198,300,000
CSMC Trust \| Third parties
Debt Instrument [Line Items]
Trust certificates issued			1,200,000,000		1,200,000,000
CSMC Trust \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, face amount			1,370,691,000		1,370,691,000
Securitized debt, at fair value			1,232,700,000		1,232,700,000
Non-QM Loans \| Arroyo Trust
Debt Instrument [Line Items]
Borrowing amount			344,500,000		344,500,000
Non-QM Loans \| Arroyo Mortgage Trust 2020 \| Arroyo Trust
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity			401,500,000		$ 401,500,000
Non-QM Loans \| SOFR \| Arroyo Trust
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					2.00%
Residential Whole Loans \| Arroyo Trust \| Secured Debt
Debt Instrument [Line Items]
Fair value			$ 277,100,000		$ 277,100,000
Redemption of offering notes period					3 years
Maximum aggregate collateral balance over original principal balance percentage			20.00%		20.00%
Residential Whole Loans \| Arroyo Mortgage Trust 2020
Debt Instrument [Line Items]
Repurchase agreements, net			$ 372,700,000		$ 372,700,000
Residential Whole Loans \| Arroyo Mortgage Trust 2020 \| Secured Debt
Debt Instrument [Line Items]
Fair value			$ 148,000,000		$ 148,000,000
Redemption of offering notes period					3 years
Maximum aggregate collateral balance over original principal balance percentage			30.00%		30.00%
Residential Whole Loans \| Arroyo Mortgage Trust 2020 \| Arroyo Trust
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity								$ 355,800,000
Repurchase agreements, net								$ 341,700,000
Residential Whole Loans \| Arroyo Trust 2019
Debt Instrument [Line Items]
Repurchase agreements, net		$ 919,000,000
Residential Whole Loans \| Arroyo Trust 2019 \| Arroyo Trust
Debt Instrument [Line Items]
Transferred of non-qm residential whole loans		$ 945,500,000
Residential Whole Loans \| Arroyo Mortgage Trust 2022
Debt Instrument [Line Items]
Fair value			$ 405,000,000		$ 405,000,000
Repurchase agreements, net						$ 398,900,000
Residential Whole Loans \| Arroyo Mortgage Trust 2022 \| Secured Debt
Debt Instrument [Line Items]
Redemption of offering notes period					3 years
Maximum aggregate collateral balance over original principal balance percentage			30.00%		30.00%
Residential Whole Loans \| Arroyo Mortgage Trust 2022 \| Arroyo Trust
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 432,000,000
Securitized commercial loans \| CSMC Trust
Debt Instrument [Line Items]
Principal			$ 1,400,000,000		$ 1,400,000,000
Non-Agency CMBS and Non-Agency RMBS Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity			101,000,000		101,000,000
Commercial loans, at fair value			161,000,000		$ 161,000,000
Non-Agency CMBS and Non-Agency RMBS Facility \| SOFR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					2.00%
Commercial Whole Loan Facility \| Estimated Fair Value
Debt Instrument [Line Items]
Commercial loans, at fair value			87,100,000		$ 87,100,000
Commercial Whole Loan Facility \| Repurchase agreements
Debt Instrument [Line Items]
Fair value			$ 63,700,000		$ 63,700,000
Commercial Whole Loan Facility \| SOFR \| Repurchase agreements
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					2.25%
6.75% Convertible Senior Unsecured Notes \| Convertible Senior Unsecured Notes due 2024
Debt Instrument [Line Items]
Interest rate stated percentage			6.75%		6.75%
Debt instrument, face amount	$ 86,300,000
Proceeds from notes payable	$ 83,300,000
Redemption price, percentage	100.00%
Convertible senior unsecured notes, conversion price (in dollars per share) \| $ / shares			$ 29.59		$ 29.59
6.75% Convertible Senior Unsecured Notes \| Convertible Senior Unsecured Notes due 2022
Debt Instrument [Line Items]
Fair value			$ 27,000,000		$ 27,000,000		$ 37,700,000
Interest rate stated percentage			6.75%		6.75%
Redemption price, percentage					100.00%
Convertible senior unsecured notes, conversion price (in dollars per share) \| $ / shares			$ 120.20		$ 120.20
6.75% Convertible Senior Unsecured Notes \| Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio					0.0337952
Six Point Seventy Five Percent Convertible Senior Unsecured Notes Due 2022 \| Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio					0.0083195000
Class F \| CSMC Trust \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, face amount			$ 153,600,000		$ 153,600,000
Debt instrument, debt default, amount			14,900,000		14,900,000
Securitized debt, at fair value			110,014,000		110,014,000
Class F \| CSMC Trust \| Secured Debt \| Estimated Fair Value
Debt Instrument [Line Items]
Securitized debt, at fair value			$ 1,200,000,000		$ 1,200,000,000
Minimum \| Non-QM Loans \| SOFR \| Arroyo Trust
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					0.25%
Minimum \| Repurchase Agreements
Debt Instrument [Line Items]
Debt instrument, term					1 month
Maximum \| Repurchase Agreements
Debt Instrument [Line Items]
Debt instrument, term					12 months