Commitments and Contingencies (Details) $ in Millions	6 Months Ended
Jun. 30, 2026 USD ($)
Other Commitments [Line Items]
Commitments to invest in MSRs	$ 38.2
Mortgage Servicing Counterparty \| Line of Credit \| Mortgage Servicing Counterparty, Credit Facility
Other Commitments [Line Items]
Line of credit facility, maximum borrowing capacity	100.0
Draws on credit facility	$ 58.5
Remaining borrowing capacity, percentage	41.50%
Advances, percentage of fair value of collateral pledged	65.00%
Debt instrument, basis spread on variable rate	3.00%
Debt instrument, floor interest rate	5.50%
Debt instrument, extension term	1 year

Commitments To Invest In Mortgage Servicing Rights

No definition available.

Name:	cim_CommitmentsToInvestInMortgageServicingRights
Namespace Prefix:	cim_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Debt Instrument, Extension, Term

+ References

No definition available.

+ Details

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Namespace Prefix:	cim_
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Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Floor Interest Rate

+ References

No definition available.

+ Details

Name:	cim_DebtInstrumentFloorInterestRate
Namespace Prefix:	cim_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Advances, Percentage Of Fair Value Of Collateral Pledged

+ References

No definition available.

+ Details

Name:	cim_LineOfCreditFacilityAdvancesPercentageOfFairValueOfCollateralPledged
Namespace Prefix:	cim_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Remaining Borrowing Capacity, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	cim_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-8

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cim_MortgageServicingCounterpartyCreditFacilityMember
Namespace Prefix:
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Period Type: