XML 68 R57.htm IDEA: XBRL DOCUMENT
v3.25.3

Derivative Instruments, Information of TBA Derivatives (Details) - Notional Amount of TBAs, Net [Member] - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
TBA Derivatives [Abstract] |  |
Notional | $ 415,775 | $ 435,575
Cost Basis | (409,383) | (409,748)
Fair Value | (409,939) | (399,316)
Net Carrying Value | (555) | 10,434
Purchase Contracts [Member] |  |
TBA Derivatives [Abstract] |  |
Notional | 368,650 | 234,625
Cost Basis | 374,690 | 238,096
Fair Value | 374,268 | 237,021
Net Carrying Value | (421) | (1,074)
Sale Contracts [Member] |  |
TBA Derivatives [Abstract] |  |
Notional | 784,425 | 670,200
Cost Basis | (784,073) | (647,844)
Fair Value | (784,207) | (636,337)
Net Carrying Value | $ (134) | $ 11,508

X
- Definition Carrying value of the assets less the liabilities of a derivative or group of derivatives. + References No definition available. + Details
Name: | chmi_DerivativeCarryingValueNet
Namespace Prefix: | chmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative assets measured at implied cost basis + References No definition available. + Details
Name: | chmi_DerivativeImpliedCostBasis
Namespace Prefix: | chmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | chmi_TBADerivativesAbstract
Namespace Prefix: | chmi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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
Name: | us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=chmi_TbaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |