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v3.23.2

Summary of Significant Accounting Policies - Residential Whole Loans (Details) | 6 Months Ended
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Jun. 30, 2023
Accounting Policies [Abstract] |
Number of days considered to classify loans delinquent | 60 days
Weighted Average LTV Ratio | 80.00%

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- Definition Represents the number of days considered to classify loans delinquent. + References No definition available. + Details
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Namespace Prefix: | mfa_
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Balance Type: | na
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- Definition The LTV of which the Company has assessed its residential whole loans at carrying value will have a higher likelihood of default than newly originated mortgage loans + References No definition available. + Details
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Namespace Prefix: | mfa_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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