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Equity and Earnings per Common Share, Non-Controlling Interests in Operating Partnership (Details) - LTIP-OP Units [Member] - Operating Partnership [Member]	Sep. 30, 2025 shares
Noncontrolling Interest in Operating Partnership [Abstract]
Number of LTIP units owned by non-controlling interest holders in Operating Partnership (in shares)	576,415
Percentage of operating partnership	1.71%

X

- 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

X

- Details

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

X

- Details

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