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v3.21.1

Other Assets (Impact of Derivative Instruments) (Details) - Swaps, at fair value - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Derivative [Line Items] |  |
Interest (expense)/income attributable to Swaps | $ 0 | $ (3,359)
Weighted average Swap rate paid | 0.00% | 2.09%
Weighted average Swap rate received | 0.00% | 1.65%

X
- Definition Represents the weighted average interest rate paid related to derivatives. + References No definition available. + Details
Name: | mfa_DerivativeWeightedAverageInterestRatePaid
Namespace Prefix: | mfa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average interest rate received related to derivatives. + References No definition available. + Details
Name: | mfa_DerivativeWeightedAverageInterestRateReceived
Namespace Prefix: | mfa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net amount of nonoperating interest income (expense). + References No definition available. + Details
Name: | us-gaap_InterestIncomeExpenseNonoperatingNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |