XML 74 R64.htm IDEA: XBRL DOCUMENT
v3.23.1

Other Assets - Derivative Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 3,000,000 |
Swaps, at fair value |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 2,960,010 | $ 3,160,010
Weighted Average Fixed-Pay Interest Rate | 1.58% | 1.69%
Weighted Average Variable Interest Rate | 4.87% | 4.30%
Swaps, at fair value | Within 30 days to 12 months |  |
Derivative [Line Items] |  |
Derivative, 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 6 months to 12 months |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 100,000 | $ 0
Weighted Average Fixed-Pay Interest Rate | 1.49% | 0.00%
Weighted Average Variable Interest Rate | 4.87% | 0.00%
Swaps, at fair value | Over 12 months to 24 months |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 1,000,010 | $ 550,010
Weighted Average Fixed-Pay Interest Rate | 1.09% | 1.01%
Weighted Average Variable Interest Rate | 4.87% | 4.30%
Swaps, at fair value | Over 24 months to 36 months |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 125,000 | $ 775,000
Weighted Average Fixed-Pay Interest Rate | 2.70% | 1.75%
Weighted Average Variable Interest Rate | 4.87% | 4.30%
Swaps, at fair value | Over 36 months to 48 months |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 1,300,000 | $ 450,000
Weighted Average Fixed-Pay Interest Rate | 1.42% | 1.12%
Weighted Average Variable Interest Rate | 4.87% | 4.30%
Swaps, at fair value | Over 48 months to 60 months |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 125,000 | $ 1,075,000
Weighted Average Fixed-Pay Interest Rate | 2.71% | 1.86%
Weighted Average Variable Interest Rate | 4.87% | 4.30%
Swaps, at fair value | Over 60 months to 72 months |  |
Derivative [Line Items] |  |
Derivative, 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 72 months to 84 months |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 310,000 | $ 310,000
Weighted Average Fixed-Pay Interest Rate | 2.95% | 2.95%
Weighted Average Variable Interest Rate | 4.87% | 4.30%

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_DerivativeMaturityOver6MonthsTo12MonthsMember
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: |

X
- Details
Name: | mfa_DerivativeByMaturityAxis=mfa_DerivativeMaturityOver60MonthsTo72MonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mfa_DerivativeByMaturityAxis=mfa_DerivativeMaturityOver72MonthsTo84MonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |