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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income $ 82,173us-gaap_NetIncomeLoss $ 76,188us-gaap_NetIncomeLoss
Other Comprehensive Income:    
Reclassification adjustment for MBS sales included in net income (6,423)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (2,950)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Reclassification adjustment for other-than-temporary impairments included in net income (407)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Unrealized loss on derivative hedging instruments, net (32,367)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (12,267)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of unrealized loss on de-designated derivative hedging instruments 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 447us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Cumulative effect adjustment on adoption of revised accounting standard for repurchase agreement financing 4,537us-gaap_OtherComprehensiveIncomeCumulativeEffectOfChangeInAccountingPrincipleNetOfTaxes 0us-gaap_OtherComprehensiveIncomeCumulativeEffectOfChangeInAccountingPrincipleNetOfTaxes
Other Comprehensive Income 4,375us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 54,490us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income before preferred stock dividends 86,548us-gaap_ComprehensiveIncomeNetOfTax 130,678us-gaap_ComprehensiveIncomeNetOfTax
Dividends declared on preferred stock (3,750)us-gaap_PreferredStockDividendsIncomeStatementImpact (3,750)us-gaap_PreferredStockDividendsIncomeStatementImpact
Comprehensive Income Available to Common Stock and Participating Securities 82,798mfa_ComprehensiveIncomeLossToCommonStockholdersAndParticipatingSecurities 126,928mfa_ComprehensiveIncomeLossToCommonStockholdersAndParticipatingSecurities
Agency Mortgage Backed Securities    
Other Comprehensive Income:    
Unrealized (loss)/gain on MBS and CRT securities, net 12,885us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 17,843us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Non-Agency MBS    
Other Comprehensive Income:    
Unrealized (loss)/gain on MBS and CRT securities, net 20,609us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		 51,417us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
CRT securities    
Other Comprehensive Income:    
Unrealized (loss)/gain on MBS and CRT securities, net $ 5,541us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember		 $ 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember