Commitments and Contingencies (Details)	6 Months Ended
Jun. 30, 2022
Commitments and Contingencies [Abstract]
Percentage of annual management fee paid equal to gross equity	1.50%

Percentage of annual management fee paid equal to gross equity.

No definition available.

Name:	chmi_PercentageOfGrossEquityPaidToManagerAsAnnualManagementFee
Namespace Prefix:	chmi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration