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Equity and Earnings per Common Share, Non-Controlling Interests in Operating Partnership (Details) - LTIP-OP Units [Member] - Operating Partnership [Member] | Jun. 30, 2025 shares
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Noncontrolling Interest in Operating Partnership [Abstract] |
Number of LTIP units owned by non-controlling interest holders in Operating Partnership (in shares) | 594,216
Percentage of operating partnership | 1.83%

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- Definition Number of shares held by non-controlling interest holders in operating partnerships. + References No definition available. + Details
Name: | chmi_SharesHeldByMinorityInterestInOperatingPartnerships
Namespace Prefix: | chmi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_MinorityInterestAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_AwardTypeAxis=chmi_LongTermIncentivePlanUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=chmi_OperatingPartnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |