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Summary of Significant Accounting Policies - Residential Whole Loans (Details) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Number of days considered to classify loans delinquent | 60 days
LTV ratio (as a percent) | 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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Period Type: | duration