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Offsetting Assets and Liabilities (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
counterparty
Dec. 31, 2013
Derivative hedging instruments, at fair value    
Gross Amounts of Recognized Assets $ 3,136,000us-gaap_DerivativeFairValueOfDerivativeAsset $ 13,000,000us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amounts Offset in the Consolidated Balance Sheets 0us-gaap_DerivativeAssetFairValueGrossLiability 0us-gaap_DerivativeAssetFairValueGrossLiability
Net Amounts of Assets Presented in the Consolidated Balance Sheets 3,136,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 13,000,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Gross Amounts Not Offset in the Consolidated Balance Sheets    
Financial Instruments (3,136,000)us-gaap_DerivativeCollateralObligationToReturnSecurities (13,000,000)us-gaap_DerivativeCollateralObligationToReturnSecurities
Cash Collateral Received 0us-gaap_DerivativeCollateralObligationToReturnCash 0us-gaap_DerivativeCollateralObligationToReturnCash
Net Amount 0us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 0us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Swaps, at fair value    
Gross Amounts of Recognized Liabilities 62,198,000us-gaap_DerivativeFairValueOfDerivativeLiability 28,217,000us-gaap_DerivativeFairValueOfDerivativeLiability
Gross Amounts Offset in the Consolidated Balance Sheets 0us-gaap_DerivativeLiabilityFairValueGrossAsset 0us-gaap_DerivativeLiabilityFairValueGrossAsset
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets 62,198,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 28,217,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Gross Amounts Not Offset in the Consolidated Balance Sheets    
Financial Instruments 0us-gaap_DerivativeCollateralRightToReclaimSecurities 0us-gaap_DerivativeCollateralRightToReclaimSecurities
Cash Collateral Pledged (62,198,000)us-gaap_DerivativeCollateralRightToReclaimCash (28,217,000)us-gaap_DerivativeCollateralRightToReclaimCash
Net Amount 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
Repurchase agreements    
Gross Amounts of Recognized Liabilities 8,267,388,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross 8,339,297,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Gross Amounts Offset in the Consolidated Balance Sheets 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets 8,267,388,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase 8,339,297,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Gross Amounts Not Offset in the Consolidated Balance Sheets    
Financial Instruments (8,266,619,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities (8,339,297,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Cash Collateral Pledged (769,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash
Net Amount 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral
Total    
Gross Amounts of Recognized Liabilities 8,329,586,000us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross 8,367,514,000us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
Gross Amounts Offset in the Consolidated Balance Sheets 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets 8,329,586,000us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement 8,367,514,000us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement
Gross Amounts Not Offset in the Consolidated Balance Sheets    
Financial Instruments (8,266,619,000)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities (8,339,297,000)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
Cash Collateral Pledged (62,967,000)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash (28,217,000)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
Net Amount 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
Additional disclosures    
Derivatives, excess collateral 4,300,000mfa_DerivativeCollateralExcess 9,300,000mfa_DerivativeCollateralExcess
Fair value of securities pledged against the swaps 57,200,000us-gaap_DerivativeLiabilityFairValueOfCollateral 73,900,000us-gaap_DerivativeLiabilityFairValueOfCollateral
Fair value of securities pledged against the repurchase agreements $ 9,934,000,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral $ 10,116,000,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral
Number of repurchase agreement counterparties with unconditional right of setoff 1mfa_NumberOfRepurchaseAgreementCounterpartiesWithUnconditionalRightOfSetoff