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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: