XML 78 R70.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Other Assets - Derivative Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 900,000 |
Swaps, at fair value |  |
Derivative [Line Items] |  |
Notional Amount | $ 900,010 | $ 0
Weighted Average Fixed-Pay Interest Rate | 1.01% | 0.00%
Weighted Average Variable Interest Rate | 0.05% | 0.00%
Swaps, at fair value | Within 30 days to 12 months |  |
Derivative [Line Items] |  |
Notional Amount | $ 0 | $ 0
Weighted Average Fixed-Pay Interest Rate | 0.00% | 0.00%
Weighted Average Variable Interest Rate | 0.00% | 0.00%
Swaps, at fair value | Over 12 months to 24 months |  |
Derivative [Line Items] |  |
Notional Amount | $ 0 | $ 0
Weighted Average Fixed-Pay Interest Rate | 0.00% | 0.00%
Weighted Average Variable Interest Rate | 0.00% | 0.00%
Swaps, at fair value | Over 24 months to 36 months |  |
Derivative [Line Items] |  |
Notional Amount | $ 450,010 | $ 0
Weighted Average Fixed-Pay Interest Rate | 0.90% | 0.00%
Weighted Average Variable Interest Rate | 0.05% | 0.00%
Swaps, at fair value | Over 36 months to 48 months |  |
Derivative [Line Items] |  |
Notional Amount | $ 0 | $ 0
Weighted Average Fixed-Pay Interest Rate | 0.00% | 0.00%
Weighted Average Variable Interest Rate | 0.00% | 0.00%
Swaps, at fair value | Over 48 months to 60 months |  |
Derivative [Line Items] |  |
Notional Amount | $ 450,000 | $ 0
Weighted Average Fixed-Pay Interest Rate | 1.12% | 0.00%
Weighted Average Variable Interest Rate | 0.05% | 0.00%

X
- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Average variable interest rate related to the group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageVariableInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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 Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | mfa_DerivativeByMaturityAxis=mfa_DerivativeMaturityWithin30DayTo12MonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mfa_DerivativeByMaturityAxis=mfa_DerivativeMaturityOver12MonthsTo24MonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mfa_DerivativeByMaturityAxis=mfa_DerivativeMaturityOver24MonthsTo36MonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mfa_DerivativeByMaturityAxis=mfa_DerivativeMaturityOver36MonthsTo48MonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mfa_DerivativeByMaturityAxis=mfa_DerivativeMaturityOver48MonthsTo60MonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |