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Derivative Instruments, Information of TBA Derivatives (Details) - Notional Amount of TBAs, Net [Member] - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
TBA Derivatives [Abstract]
Notional	$ 413,475	$ 435,575
Cost Basis	(389,193)	(409,748)
Fair Value	(396,900)	(399,316)
Net Carrying Value	(7,707)	10,434
Purchase Contracts [Member]
TBA Derivatives [Abstract]
Notional	296,825	234,625
Cost Basis	299,948	238,096
Fair Value	302,318	237,021
Net Carrying Value	2,370	(1,074)
Sale Contracts [Member]
TBA Derivatives [Abstract]
Notional	710,300	670,200
Cost Basis	(689,141)	(647,844)
Fair Value	(699,218)	(636,337)
Net Carrying Value	$ (10,077)	$ 11,508

X

- Definition

Carrying value of the assets less the liabilities of a derivative or group of derivatives.

+ References

No definition available.

+ Details

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Namespace Prefix:	chmi_
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Balance Type:	debit
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X

- Definition

Derivative assets measured at implied cost basis

+ References

No definition available.

+ Details

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Namespace Prefix:	chmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: 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

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

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- Details

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- Details

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