$MFA
MFA FINANCIAL, INC. Stock $mfa

$mfa Overview Financials Valuation SEC Filings Company Website

2019 Form 10-K Financial Statement

#000105516020000006 Filed on February 21, 2020

Income Statement

Concept	2019	2018 Q4	2018 Q3
Revenue	$695.9M	$132.7M	$117.4M
YoY Change	52.72%	31.56%	11.7%
Cost Of Revenue	$332.4M	$70.90M	$58.90M
YoY Change	43.15%	46.19%	19.47%
Gross Profit	$475.4M	$84.00M	$106.9M
YoY Change	24.22%	-27.84%	25.76%
Gross Profit Margin	68.31%	63.28%	91.03%
Selling, General & Admin	$52.60M	$11.90M	$11.00M
YoY Change	14.1%	27.96%	-26.67%
% of Gross Profit	11.06%	14.17%	10.29%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$3.300M	$400.0K	$600.0K
YoY Change	83.33%	33.33%	-25.0%
% of Gross Profit	0.69%	0.48%	0.56%
Operating Expenses	$97.00M	$21.90M	$19.80M
YoY Change	21.86%	30.36%	-6.16%
Operating Profit	$378.4M	$62.10M	$87.10M
YoY Change	24.84%	-37.65%	36.31%
Interest Expense	$332.4M	$70.94M	$58.88M
YoY Change	43.14%	46.29%	19.49%
% of Operating Profit	87.83%	114.24%	67.6%
Other Income/Expense, Net
YoY Change
Pretax Income	$378.1M	$60.90M	$87.10M
YoY Change	25.28%	-39.46%	36.52%
Income Tax	$499.0K
% Of Pretax Income	0.13%
Net Earnings	$378.1M	$60.88M	$87.13M
YoY Change	25.29%	-39.48%	36.56%
Net Earnings / Revenue	54.33%	45.86%	74.2%
Basic Earnings Per Share	$0.80		$0.19
Diluted Earnings Per Share	$0.79	$135.4K	$0.19
COMMON SHARES
Basic Shares Outstanding	451.0M shares	449.5M shares	428.7M shares
Diluted Shares Outstanding	467.8M shares		428.7M shares

Balance Sheet

Concept	2019	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$71.00M	$52.00M	$104.0M
YoY Change	36.54%	-88.44%	-82.89%
Cash & Equivalents	$71.00M	$52.00M	$104.2M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$71.00M	$52.00M	$104.0M
YoY Change	36.54%	-88.44%	-82.89%
LONG-TERM ASSETS
Property, Plant & Equipment
YoY Change
Goodwill		$7.200M	$7.189M
YoY Change		0.15%	-0.15%
Intangibles
YoY Change
Long-Term Investments	$12.65B	$11.80B	$11.27B
YoY Change	7.18%	15.13%	9.95%
Other Assets	$64.00M	$37.00M	$6.000M
YoY Change	72.97%	184.62%	-60.0%
Total Long-Term Assets	$13.50B	$12.37B	$11.68B
YoY Change	9.13%	17.74%	11.27%
TOTAL ASSETS
Total Short-Term Assets	$71.00M	$52.00M	$104.0M
Total Long-Term Assets	$13.50B	$12.37B	$11.68B
Total Assets	$13.57B	$12.42B	$11.78B
YoY Change	9.24%	13.38%	6.11%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$62.00M
YoY Change	44.19%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$7.879B	$7.278B
YoY Change	-100.0%	19.11%	5.92%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$153.0M	$7.879B	$7.278B
YoY Change	-98.09%	19.11%	5.92%
LONG-TERM LIABILITIES
Long-Term Debt	$10.03B	$211.0M	$0.00
YoY Change	911.29%	117.53%	-100.0%
Other Long-Term Liabilities		$914.0M	$951.0M
YoY Change		-6.92%	8.31%
Total Long-Term Liabilities	$10.03B	$1.125B	$951.0M
YoY Change	911.29%	4.26%	-2.46%
TOTAL LIABILITIES
Total Short-Term Liabilities	$153.0M	$7.879B	$7.278B
Total Long-Term Liabilities	$10.03B	$1.125B	$951.0M
Total Liabilities	$10.18B	$9.004B	$8.230B
YoY Change	13.11%	17.04%	4.89%
SHAREHOLDERS EQUITY
Retained Earnings		-$632.0M	-$599.0M
YoY Change		9.17%	0.49%
Common Stock		$4.498M	$4.495M
YoY Change		13.07%	13.25%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.384B	$3.416B	$3.552B
YoY Change
Total Liabilities & Shareholders Equity	$13.57B	$12.42B	$11.78B
YoY Change	9.24%	13.38%	6.11%

Cashflow Statement

Concept	2019	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$378.1M	$60.88M	$87.13M
YoY Change	25.29%	-39.48%	36.56%
Depreciation, Depletion And Amortization	$3.300M	$400.0K	$600.0K
YoY Change	83.33%	33.33%	-25.0%
Cash From Operating Activities	$215.8M	$57.60M	$46.50M
YoY Change	45.91%	4.54%	101.3%
INVESTING ACTIVITIES
Capital Expenditures	$1.879M	-$100.0K	-$400.0K
YoY Change	65.84%	-66.67%	33.33%
Acquisitions
YoY Change
Other Investing Activities	-$1.133B	-$544.7M	-$1.879B
YoY Change	-47.47%	332.64%	-2114.15%
Cash From Investing Activities	-$1.135B	-$544.8M	-$1.880B
YoY Change	-47.41%	331.7%	-2121.18%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	-$12.33M
YoY Change	-96.86%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$964.9M	464.6M	1.886B
YoY Change	-40.98%	-622.61%	-854.88%
NET CHANGE
Cash From Operating Activities	$215.8M	57.60M	46.50M
Cash From Investing Activities	-$1.135B	-544.8M	-1.880B
Cash From Financing Activities	$964.9M	464.6M	1.886B
Net Change In Cash	$45.96M	-22.60M	52.50M
YoY Change	-112.25%	-85.87%	-139.27%
FREE CASH FLOW
Cash From Operating Activities	$215.8M	$57.60M	$46.50M
Capital Expenditures	$1.879M	-$100.0K	-$400.0K
Free Cash Flow	$213.9M	$57.70M	$46.90M
YoY Change	45.76%	4.15%	100.43%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-3974868
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	350 Park Avenue, 20th Floor
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001055160
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10022
CY2019	mfa	Preferred Stock Voting Rights Percentage Required For Making Material And Adverse Changes To Terms Minimum PreferredStockVotingRightsPercentageRequiredForMakingMaterialAndAdverseChangesToTermsMinimum	0.6667
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CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	886950000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	886950000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	449787000	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	452369000	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	449787000	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	452369000	shares
CY2018Q4	us-gaap	Goodwill Goodwill	7200000	USD
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CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	8000000	shares
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CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	8000000	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
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CY2019	dei	Entity File Number EntityFileNumber	1-13991
CY2019	dei	Entity Registrant Name EntityRegistrantName	MFA FINANCIAL, INC.
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CY2019	dei	Security12g Title Security12gTitle	None
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CY2017	us-gaap	Other Than Temporary Impairment Loss Debt Securities Portion Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings	1032000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-23342000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	14545000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	35297000	USD
CY2019	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	-2454000	USD
CY2018	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	0	USD
CY2017	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-50241000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-188936000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	35542000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	327876000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	112865000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	357935000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	15000000	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	15000000	USD
CY2017	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	15000000	USD
CY2019	mfa	Comprehensive Income Loss To Common Stockholders And Participating Securities ComprehensiveIncomeLossToCommonStockholdersAndParticipatingSecurities	312876000	USD
CY2018	mfa	Comprehensive Income Loss To Common Stockholders And Participating Securities ComprehensiveIncomeLossToCommonStockholdersAndParticipatingSecurities	97865000	USD
CY2017	mfa	Comprehensive Income Loss To Common Stockholders And Participating Securities ComprehensiveIncomeLossToCommonStockholdersAndParticipatingSecurities	342935000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	3416101000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	378117000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	12325000	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	4118000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9230000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	-345000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	361033000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	15000000	USD
CY2019	mfa	Dividends Dividend Equivalent Rights DividendsDividendEquivalentRights	1084000	USD
CY2019	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-24445000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-25796000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	3383952000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	3261636000	USD
CY2018Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	295000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	301801000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	392145000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	3392000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	7999000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	-261000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	339244000	USD
CY2018	us-gaap	Dividends Preferred Stock DividendsPreferredStock	15000000	USD
CY2018	mfa	Dividends Dividend Equivalent Rights DividendsDividendEquivalentRights	942000	USD
CY2018	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-203481000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	14545000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	3416101000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	3033902000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	322393000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	196808000	USD
CY2017	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	5995000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	7872000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	-184000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	312810000	USD
CY2017	us-gaap	Dividends Preferred Stock DividendsPreferredStock	15000000	USD
CY2017	mfa	Dividends Dividend Equivalent Rights DividendsDividendEquivalentRights	892000	USD
CY2017	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	245000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	35297000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	3261636000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	378117000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	301801000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	322393000	USD
CY2019	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	62002000	USD
CY2018	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	61307000	USD
CY2019	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	7440000	USD
CY2018	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	7715000	USD
CY2017	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	4475000	USD
CY2017	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	39577000	USD
CY2019	mfa	Gainon Liquidationof Residential Whole Loans GainonLiquidationofResidentialWholeLoans	19081000	USD
CY2018	mfa	Gainon Liquidationof Residential Whole Loans GainonLiquidationofResidentialWholeLoans	22409000	USD
CY2017	mfa	Gainon Liquidationof Residential Whole Loans GainonLiquidationofResidentialWholeLoans	11868000	USD
CY2019	us-gaap	Other Than Temporary Impairment Loss Debt Securities Portion Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings	180000	USD
CY2018	us-gaap	Other Than Temporary Impairment Loss Debt Securities Portion Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings	1259000	USD
CY2017	us-gaap	Other Than Temporary Impairment Loss Debt Securities Portion Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings	1032000	USD
CY2019	mfa	Accretionof Purchase Discounts AccretionofPurchaseDiscounts	70383000	USD
CY2018	mfa	Accretionof Purchase Discounts AccretionofPurchaseDiscounts	82904000	USD
CY2017	mfa	Accretionof Purchase Discounts AccretionofPurchaseDiscounts	86318000	USD
CY2019	mfa	Amortization Of Purchase Premiums AmortizationOfPurchasePremiums	45216000	USD
CY2018	mfa	Amortization Of Purchase Premiums AmortizationOfPurchasePremiums	29270000	USD
CY2017	mfa	Amortization Of Purchase Premiums AmortizationOfPurchasePremiums	30330000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	3318000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1825000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1519000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	9239000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	8007000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	8033000	USD
CY2019	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	47849000	USD
CY2018	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	36725000	USD
CY2017	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	33617000	USD
CY2019	mfa	Unrealized Losses Gainson Securities Held At Fair Valueand Swaps Not Designatedas Hedges UnrealizedLossesGainsonSecuritiesHeldAtFairValueandSwapsNotDesignatedasHedges	-2169000	USD
CY2018	mfa	Unrealized Losses Gainson Securities Held At Fair Valueand Swaps Not Designatedas Hedges UnrealizedLossesGainsonSecuritiesHeldAtFairValueandSwapsNotDesignatedasHedges	-43234000	USD
CY2017	mfa	Unrealized Losses Gainson Securities Held At Fair Valueand Swaps Not Designatedas Hedges UnrealizedLossesGainsonSecuritiesHeldAtFairValueandSwapsNotDesignatedasHedges	27091000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	34262000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	26487000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-21964000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	18553000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	32000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-5813000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	215775000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	147881000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	176512000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	2098416000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	2327817000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	3996489000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	908697000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	538668000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	243081000	USD
CY2019	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1008215000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	2604234000	USD
CY2017	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1583130000	USD
CY2019	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	4598191000	USD
CY2018	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	3058839000	USD
CY2017	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	1065981000	USD
CY2019	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	1378529000	USD
CY2018	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	531909000	USD
CY2017	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	160469000	USD
CY2019	mfa	Proceeds From Real Estate Owned ProceedsFromRealEstateOwned	108012000	USD
CY2018	mfa	Proceeds From Real Estate Owned ProceedsFromRealEstateOwned	121304000	USD
CY2017	mfa	Proceeds From Real Estate Owned ProceedsFromRealEstateOwned	75671000	USD
CY2019	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	20110000	USD
CY2018	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	13367000	USD
CY2017	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	19801000	USD
CY2019	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	USD
CY2018	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	USD
CY2017	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	10422000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1879000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1133000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	872000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1134741000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2157875000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1816348000	USD
CY2019	mfa	Principal Paymentson Securities Soldunder Agreementsto Repurchaseand Other Advances PrincipalPaymentsonSecuritiesSoldunderAgreementstoRepurchaseandOtherAdvances	67463756000	USD
CY2018	mfa	Principal Paymentson Securities Soldunder Agreementsto Repurchaseand Other Advances PrincipalPaymentsonSecuritiesSoldunderAgreementstoRepurchaseandOtherAdvances	67063283000	USD
CY2017	mfa	Principal Paymentson Securities Soldunder Agreementsto Repurchaseand Other Advances PrincipalPaymentsonSecuritiesSoldunderAgreementstoRepurchaseandOtherAdvances	72563218000	USD
CY2019	mfa	Proceedsfrom Securities Soldunder Agreementsto Repurchase ProceedsfromSecuritiesSoldunderAgreementstoRepurchase	68724021000	USD
CY2018	mfa	Proceedsfrom Securities Soldunder Agreementsto Repurchase ProceedsfromSecuritiesSoldunderAgreementstoRepurchase	68327462000	USD
CY2017	mfa	Proceedsfrom Securities Soldunder Agreementsto Repurchase ProceedsfromSecuritiesSoldunderAgreementstoRepurchase	70490091000	USD
CY2019	mfa	Proceedsfrom Issuanceof Securitized Debt ProceedsfromIssuanceofSecuritizedDebt	0	USD
CY2018	mfa	Proceedsfrom Issuanceof Securitized Debt ProceedsfromIssuanceofSecuritizedDebt	419970000	USD
CY2017	mfa	Proceedsfrom Issuanceof Securitized Debt ProceedsfromIssuanceofSecuritizedDebt	382847000	USD
CY2019	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	114386000	USD
CY2018	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	97969000	USD
CY2017	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	16562000	USD
CY2019	mfa	Payments Madefor Securitization Related Cost PaymentsMadeforSecuritizationRelatedCost	0	USD
CY2018	mfa	Payments Madefor Securitization Related Cost PaymentsMadeforSecuritizationRelatedCost	2497000	USD
CY2017	mfa	Payments Madefor Securitization Related Cost PaymentsMadeforSecuritizationRelatedCost	2646000	USD
CY2019	us-gaap	Proceeds From Convertible Debt ProceedsFromConvertibleDebt	223311000	USD
CY2018	us-gaap	Proceeds From Convertible Debt ProceedsFromConvertibleDebt	0	USD
CY2017	us-gaap	Proceeds From Convertible Debt ProceedsFromConvertibleDebt	0	USD
CY2019	mfa	Payments Made For Margin Calls On Repurchase Agreements And Derivatives PaymentsMadeForMarginCallsOnRepurchaseAgreementsAndDerivatives	40029000	USD
CY2018	mfa	Payments Made For Margin Calls On Repurchase Agreements And Derivatives PaymentsMadeForMarginCallsOnRepurchaseAgreementsAndDerivatives	61502000	USD
CY2017	mfa	Payments Made For Margin Calls On Repurchase Agreements And Derivatives PaymentsMadeForMarginCallsOnRepurchaseAgreementsAndDerivatives	11424000	USD
CY2019	mfa	Proceeds From Margin Calls On Repurchase Agreements And Derivatives ProceedsFromMarginCallsOnRepurchaseAgreementsAndDerivatives	0	USD
CY2018	mfa	Proceeds From Margin Calls On Repurchase Agreements And Derivatives ProceedsFromMarginCallsOnRepurchaseAgreementsAndDerivatives	65393000	USD
CY2017	mfa	Proceeds From Margin Calls On Repurchase Agreements And Derivatives ProceedsFromMarginCallsOnRepurchaseAgreementsAndDerivatives	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	12325000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	392474000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	197223000	USD
CY2019	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	0	USD
CY2018	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	329000	USD
CY2017	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	415000	USD
CY2019	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	15000000	USD
CY2018	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	15000000	USD
CY2017	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	15000000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	361565000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	329759000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	308588000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	964921000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1634960000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1847692000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	45955000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-375034000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	145168000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	88709000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	463743000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	318575000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	134664000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	88709000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	463743000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	330398000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	232657000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	198159000	USD
CY2019	mfa	Securities Obtained As Collateral Net Of Returns SecuritiesObtainedAsCollateralNetOfReturns	0	USD
CY2018	mfa	Securities Obtained As Collateral Net Of Returns SecuritiesObtainedAsCollateralNetOfReturns	-505850000	USD
CY2017	mfa	Securities Obtained As Collateral Net Of Returns SecuritiesObtainedAsCollateralNetOfReturns	134100000	USD
CY2019	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	257701000	USD
CY2018	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	215038000	USD
CY2017	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	136734000	USD
CY2019Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	90749000	USD
CY2018Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	90198000	USD
CY2017Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	79771000	USD
CY2019	mfa	Noncash Payablefor Unsettled Loan Purchases NoncashPayableforUnsettledLoanPurchases	0	USD
CY2018	mfa	Noncash Payablefor Unsettled Loan Purchases NoncashPayableforUnsettledLoanPurchases	211129000	USD
CY2017	mfa	Noncash Payablefor Unsettled Loan Purchases NoncashPayableforUnsettledLoanPurchases	0	USD
CY2019	us-gaap	Nature Of Operations NatureOfOperations	<span style="font-family:inherit;font-size:10pt;font-weight:bold;">Organization</span><span style="font-family:inherit;font-size:10pt;font-weight:bold;"> </span><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;text-align:justify;text-indent:29px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">MFA Financial, Inc. (the “Company”) was incorporated in Maryland on July 24, 1997 and began operations on April 10, 1998. The Company has elected to be treated as a real estate investment trust (“REIT”) for U.S. federal income tax purposes. In order to maintain its qualification as a REIT, the Company must comply with a number of requirements under federal tax law, including that it must distribute at least 90% of its annual REIT taxable income to its stockholders. The Company has elected to treat certain of its subsidiaries as taxable REIT subsidiaries (“TRS”). In general, a TRS may hold assets and engage in activities that the Company cannot hold or engage in directly and generally may engage in any real estate or non-real estate related business. (See Note </span><span style="font-family:inherit;font-size:10pt;">2</span><span style="font-family:inherit;font-size:10pt;">(</span><span style="font-family:inherit;font-size:10pt;font-style:normal;">n</span><span style="font-family:inherit;font-size:10pt;">))</span></div>
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	segment
CY2019	mfa	Number Of Days Considered To Classify Loans Delinquent NumberOfDaysConsideredToClassifyLoansDelinquent	P60D
CY2019	mfa	Number Of Days Considered To Classify Loans Delinquent NumberOfDaysConsideredToClassifyLoansDelinquent	P60D
CY2019	mfa	Loan To Value Ratio LoanToValueRatio	0.80
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	70600000	USD
CY2019	mfa	Repurchase Agreements Financing Period Low End Of Range RepurchaseAgreementsFinancingPeriodLowEndOfRange	P1M
CY2019	mfa	Repurchase Agreements Financing Period High End Of Range RepurchaseAgreementsFinancingPeriodHighEndOfRange	P6M
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	52000000.0	USD
CY2019Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	39600000	USD
CY2018Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	30000000.0	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	64000000.0	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	36700000	USD
CY2019	mfa	Repurchase Agreements Financing Collateralized Period Low Endof Range RepurchaseAgreementsFinancingCollateralizedPeriodLowEndofRange	P3M
CY2019	mfa	Repurchase Agreements Financing Collateralized Period High Endof Range RepurchaseAgreementsFinancingCollateralizedPeriodHighEndofRange	P12M
CY2019	mfa	Percentage Of Annual Reit Taxable Income Distributed To Stockholders PercentageOfAnnualREITTaxableIncomeDistributedToStockholders	1
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-27800000	USD
CY2019	mfa	Mortgage Backed Securities Period Of Fixed Rate Mortgages Minimum MortgageBackedSecuritiesPeriodOfFixedRateMortgagesMinimum	P15Y
CY2019	mfa	Mortgage Backed Securities Periodof Fixed Rate Mortgages Maximum MortgageBackedSecuritiesPeriodofFixedRateMortgagesMaximum	P30Y
CY2019Q4	us-gaap	Investment Owned Balance Principal Amount InvestmentOwnedBalancePrincipalAmount	4044818000	USD
CY2019Q4	mfa	Available For Sale Securities Purchase Premiums AvailableForSaleSecuritiesPurchasePremiums	67108000	USD
CY2019Q4	mfa	Available For Sale Securities Accretable Purchase Discounts AvailableForSaleSecuritiesAccretablePurchaseDiscounts	90694000	USD
CY2019Q4	mfa	Available For Sale Securities Discount Designated As Credit Reserve And Other Than Temporary Impairments AvailableForSaleSecuritiesDiscountDesignatedAsCreditReserveAndOtherThanTemporaryImpairments	436598000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3585248000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	417089000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	18818000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax	398271000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3983519000	USD
CY2018Q4	us-gaap	Investment Owned Balance Principal Amount InvestmentOwnedBalancePrincipalAmount	6646178000	USD
CY2018Q4	mfa	Available For Sale Securities Purchase Premiums AvailableForSaleSecuritiesPurchasePremiums	112369000	USD
CY2018Q4	mfa	Available For Sale Securities Accretable Purchase Discounts AvailableForSaleSecuritiesAccretablePurchaseDiscounts	154942000	USD
CY2018Q4	mfa	Available For Sale Securities Discount Designated As Credit Reserve And Other Than Temporary Impairments AvailableForSaleSecuritiesDiscountDesignatedAsCreditReserveAndOtherThanTemporaryImpairments	516116000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	6088525000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	484591000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	63783000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax	420808000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6509333000	USD
CY2019Q4	mfa	Available For Sale Securities Principal Payments Receivable AvailableForSaleSecuritiesPrincipalPaymentsReceivable	614000	USD
CY2018Q4	mfa	Available For Sale Securities Principal Payments Receivable AvailableForSaleSecuritiesPrincipalPaymentsReceivable	1000000.0	USD
CY2019	us-gaap	Proceeds From Sale Of Mortgage Backed Securities Mbs Categorized As Available For Sale ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	908696000	USD
CY2019	us-gaap	Gain Loss On Sales Of Mortgage Backed Securities Mbs GainLossOnSalesOfMortgageBackedSecuritiesMBS	62002000	USD
CY2018	us-gaap	Proceeds From Sale Of Mortgage Backed Securities Mbs Categorized As Available For Sale ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	538965000	USD
CY2018	us-gaap	Gain Loss On Sales Of Mortgage Backed Securities Mbs GainLossOnSalesOfMortgageBackedSecuritiesMBS	61307000	USD
CY2017	us-gaap	Proceeds From Sale Of Mortgage Backed Securities Mbs Categorized As Available For Sale ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	103989000	USD
CY2017	us-gaap	Gain Loss On Sales Of Mortgage Backed Securities Mbs GainLossOnSalesOfMortgageBackedSecuritiesMBS	39889000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	59108000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	343000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	45	security
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	792787000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	18475000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	385	security
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	851895000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	18818000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	180000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	1300000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	1000000.0	USD
CY2019	us-gaap	Impairment Of Investments ImpairmentOfInvestments	264000	USD
CY2018	us-gaap	Impairment Of Investments ImpairmentOfInvestments	1259000	USD
CY2017	us-gaap	Impairment Of Investments ImpairmentOfInvestments	63000	USD
CY2019	mfa	Otherthan Temporary Impairment Losses Investments Portion Recognizedin Reclassified From Oci OtherthanTemporaryImpairmentLossesInvestmentsPortionRecognizedinReclassifiedFromOCI	84000	USD
CY2018	mfa	Otherthan Temporary Impairment Losses Investments Portion Recognizedin Reclassified From Oci OtherthanTemporaryImpairmentLossesInvestmentsPortionRecognizedinReclassifiedFromOCI	0	USD
CY2017	mfa	Otherthan Temporary Impairment Losses Investments Portion Recognizedin Reclassified From Oci OtherthanTemporaryImpairmentLossesInvestmentsPortionRecognizedinReclassifiedFromOCI	-969000	USD
CY2019	us-gaap	Other Than Temporary Impairment Loss Debt Securities Portion Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings	180000	USD
CY2018	us-gaap	Other Than Temporary Impairment Loss Debt Securities Portion Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings	1259000	USD
CY2017	us-gaap	Other Than Temporary Impairment Loss Debt Securities Portion Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings	1032000	USD
CY2018Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	39596000	USD
CY2017Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	38337000	USD
CY2016Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	37305000	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	180000	USD
CY2018	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	1259000	USD
CY2017	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	63000	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	0	USD
CY2018	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	0	USD
CY2017	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	969000	USD
CY2019Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	39776000	USD
CY2018Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	39596000	USD
CY2017Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	38337000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	417167000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	620648000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	620403000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	44600000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	51580000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	38707000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	180000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	1259000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	1032000	USD
CY2019	mfa	Other Comprehensive Income Loss Availableforsale Securities Adjustment Excluding Cumulative Effect Netof Tax Portion Attributableto Parent OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentExcludingCumulativeEffectNetofTaxPortionAttributabletoParent	-24445000	USD
CY2018	mfa	Other Comprehensive Income Loss Availableforsale Securities Adjustment Excluding Cumulative Effect Netof Tax Portion Attributableto Parent OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentExcludingCumulativeEffectNetofTaxPortionAttributabletoParent	-203481000	USD
CY2017	mfa	Other Comprehensive Income Loss Availableforsale Securities Adjustment Excluding Cumulative Effect Netof Tax Portion Attributableto Parent OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentExcludingCumulativeEffectNetofTaxPortionAttributabletoParent	245000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	392722000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	417167000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	620648000	USD
CY2019Q4	mfa	Loans Including Fair Value Loans Credit Impaired Loansand Other Loansat Carrying Value LoansIncludingFairValueLoansCreditImpairedLoansandOtherLoansatCarryingValue	7400000000	USD
CY2018Q4	mfa	Loans Including Fair Value Loans Credit Impaired Loansand Other Loansat Carrying Value LoansIncludingFairValueLoansCreditImpairedLoansandOtherLoansatCarryingValue	4700000000	USD
CY2019Q4	mfa	Purchased Performing Loans PurchasedPerformingLoans	5367871000	USD
CY2018Q4	mfa	Purchased Performing Loans PurchasedPerformingLoans	2218728000	USD
CY2019Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet	698474000	USD
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet	797987000	USD
CY2019Q4	mfa	Residential Whole Loans Carrying Value ResidentialWholeLoansCarryingValue	6066345000	USD
CY2018Q4	mfa	Residential Whole Loans Carrying Value ResidentialWholeLoansCarryingValue	3016715000	USD
CY2019Q4	mfa	Residential Whole Loans ResidentialWholeLoans	17082	loan
CY2018Q4	mfa	Residential Whole Loans ResidentialWholeLoans	11149	loan
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	415329000	USD
CY2017Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	421872000	USD
CY2019	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	0	USD
CY2018	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	41947000	USD
CY2019	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	43346000	USD
CY2018	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	44777000	USD
CY2019	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	42538000	USD
CY2018	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	35156000	USD
CY2019	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications To From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference	40356000	USD
CY2018	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications To From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference	31443000	USD
CY2019Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	369801000	USD
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	415329000	USD
CY2019Q4	mfa	Certain Loans Acquiredin Transfer Not Accountedforas Debt Securities Acquired During Periodat Acquisitionat Fair Value Excluding Unsettled Loans CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesAcquiredDuringPeriodatAcquisitionatFairValueExcludingUnsettledLoans	1381583000	USD
CY2018Q4	mfa	Certain Loans Acquiredin Transfer Not Accountedforas Debt Securities Acquired During Periodat Acquisitionat Fair Value Excluding Unsettled Loans CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesAcquiredDuringPeriodatAcquisitionatFairValueExcludingUnsettledLoans	1471262000	USD
CY2018Q4	mfa	Residential Whole Loans Heldat Fair Value Excluded Purchase Transaction Not Occurred ResidentialWholeLoansHeldatFairValueExcludedPurchaseTransactionNotOccurred	194700000	USD
CY2019	mfa	Residential Whole Loans Fair Value Net Income Loss Coupon Payments Received ResidentialWholeLoansFairValueNetIncomeLossCouponPaymentsReceived	82168000	USD
CY2018	mfa	Residential Whole Loans Fair Value Net Income Loss Coupon Payments Received ResidentialWholeLoansFairValueNetIncomeLossCouponPaymentsReceived	70515000	USD
CY2017	mfa	Residential Whole Loans Fair Value Net Income Loss Coupon Payments Received ResidentialWholeLoansFairValueNetIncomeLossCouponPaymentsReceived	41399000	USD
CY2019	mfa	Residential Whole Loans Fair Value Net Income Loss Unrealized Gains Losses Net ResidentialWholeLoansFairValueNetIncomeLossUnrealizedGainsLossesNet	47849000	USD
CY2018	mfa	Residential Whole Loans Fair Value Net Income Loss Unrealized Gains Losses Net ResidentialWholeLoansFairValueNetIncomeLossUnrealizedGainsLossesNet	36725000	USD
CY2017	mfa	Residential Whole Loans Fair Value Net Income Loss Unrealized Gains Losses Net ResidentialWholeLoansFairValueNetIncomeLossUnrealizedGainsLossesNet	33617000	USD
CY2019	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Payoffor Liquidationof Loans ResidentialWholeLoansFairValueNetIncomeLossGainLossonPayofforLiquidationofLoans	9270000	USD
CY2018	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Payoffor Liquidationof Loans ResidentialWholeLoansFairValueNetIncomeLossGainLossonPayofforLiquidationofLoans	11087000	USD
CY2017	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Payoffor Liquidationof Loans ResidentialWholeLoansFairValueNetIncomeLossGainLossonPayofforLiquidationofLoans	4958000	USD
CY2019	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Transfersto Reo ResidentialWholeLoansFairValueNetIncomeLossGainLossonTransferstoREO	19043000	USD
CY2018	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Transfersto Reo ResidentialWholeLoansFairValueNetIncomeLossGainLossonTransferstoREO	19292000	USD
CY2017	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Transfersto Reo ResidentialWholeLoansFairValueNetIncomeLossGainLossonTransferstoREO	10071000	USD
CY2019	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	158330000	USD
CY2018	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	137619000	USD
CY2017	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	90045000	USD
CY2019Q4	us-gaap	Real Estate Investments RealEstateInvestments	411659000	USD
CY2018Q4	us-gaap	Real Estate Investments RealEstateInvestments	249413000	USD
CY2019Q4	mfa	Capital Contributionsto Loan Origination Partners CapitalContributionstoLoanOriginationPartners	147992000	USD
CY2018Q4	mfa	Capital Contributionsto Loan Origination Partners CapitalContributionstoLoanOriginationPartners	23210000	USD
CY2019Q4	us-gaap	Other Interest Earning Assets OtherInterestEarningAssets	70468000	USD
CY2018Q4	us-gaap	Other Interest Earning Assets OtherInterestEarningAssets	92022000	USD
CY2019Q4	us-gaap	Interest Receivable And Other Assets InterestReceivableAndOtherAssets	114828000	USD
CY2018Q4	us-gaap	Interest Receivable And Other Assets InterestReceivableAndOtherAssets	130964000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	39304000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	32176000	USD
CY2019Q4	us-gaap	Other Assets OtherAssets	784251000	USD
CY2018Q4	us-gaap	Other Assets OtherAssets	527785000	USD
CY2019Q4	mfa	Real Estate Heldfor Investment RealEstateHeldforInvestment	27300000	USD
CY2019Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	1652	property
CY2019Q4	us-gaap	Real Estate Investments RealEstateInvestments	411700000	USD
CY2018Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	1093	property
CY2018Q4	us-gaap	Real Estate Investments RealEstateInvestments	249400000	USD
CY2019Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	407300000	USD
CY2018Q4	us-gaap	Real Estate Investments RealEstateInvestments	249413000	USD
CY2017Q4	us-gaap	Real Estate Investments RealEstateInvestments	152356000	USD
CY2019	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	14884000	USD
CY2018	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	15929000	USD
CY2019	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	257701000	USD
CY2018	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	215038000	USD
CY2019	mfa	Real Estate Investments Additions RealEstateInvestmentsAdditions	20746000	USD
CY2018	mfa	Real Estate Investments Additions RealEstateInvestmentsAdditions	13367000	USD
CY2019	mfa	Real Estate Investments Disposals RealEstateInvestmentsDisposals	101317000	USD
CY2018	mfa	Real Estate Investments Disposals RealEstateInvestmentsDisposals	115419000	USD
CY2019Q4	us-gaap	Real Estate Investments RealEstateInvestments	411659000	USD
CY2018Q4	us-gaap	Real Estate Investments RealEstateInvestments	249413000	USD
CY2019Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	1652	property
CY2018Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	1093	property
CY2019	mfa	Gainrecordedontransferfromresidentialwholeloanstorealestateowned Gainrecordedontransferfromresidentialwholeloanstorealestateowned	19800000	USD
CY2018	mfa	Gainrecordedontransferfromresidentialwholeloanstorealestateowned Gainrecordedontransferfromresidentialwholeloanstorealestateowned	19600000	USD
CY2019	mfa	Numberof Real Estate Properties Sold During Period NumberofRealEstatePropertiesSoldDuringPeriod	571	property
CY2019	us-gaap	Proceeds From Sale Of Real Estate ProceedsFromSaleOfRealEstate	109200000	USD
CY2019	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	7400000	USD
CY2018	mfa	Numberof Real Estate Properties Sold During Period NumberofRealEstatePropertiesSoldDuringPeriod	705	property
CY2018	us-gaap	Proceeds From Sale Of Real Estate ProceedsFromSaleOfRealEstate	123200000	USD
CY2018	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	7700000	USD
CY2018Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	3121000	USD
CY2017Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-11424000	USD
CY2016Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-46721000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-23342000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	14545000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	35297000	USD
CY2019	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	-2454000	USD
CY2018	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	0	USD
CY2019Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-22675000	USD
CY2018Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	3121000	USD
CY2017Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-11424000	USD
CY2019Q4	mfa	Securities Sold Under Agreements To Repurchase Subject To Termination SecuritiesSoldUnderAgreementsToRepurchaseSubjectToTermination	2400000000	USD
CY2019Q4	mfa	Repurchase Agreements Number Of Counterparties RepurchaseAgreementsNumberOfCounterparties	28	counterparty
CY2018Q4	mfa	Repurchase Agreements Number Of Counterparties RepurchaseAgreementsNumberOfCounterparties	26	counterparty
CY2019Q4	mfa	Repurchase Agreement Counterparty Risk As Percentage Of Stockholders Equity RepurchaseAgreementCounterpartyRiskAsPercentageOfStockholdersEquity	0.05
CY2019Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	18238000	USD
CY2019Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged For Repurchase Agreements At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedForRepurchaseAgreementsAtFairValue	11300000000	USD
CY2018Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged For Repurchase Agreements At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedForRepurchaseAgreementsAtFairValue	9500000000	USD
CY2019Q4	mfa	Pledged Financial Instruments Not Separately Reported Securities Pledged Aggregate Fair Value And Accrued Interest PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledgedAggregateFairValueAndAccruedInterest	57200000	USD
CY2018Q4	mfa	Pledged Financial Instruments Not Separately Reported Securities Pledged Aggregate Fair Value And Accrued Interest PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledgedAggregateFairValueAndAccruedInterest	33100000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase Fair Value Of Collateral SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral	11200000000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase Fair Value Of Collateral SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral	9400000000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	2200000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	2700000	USD
CY2019Q4	us-gaap	Other Secured Financings OtherSecuredFinancings	570952000	USD
CY2018Q4	us-gaap	Other Secured Financings OtherSecuredFinancings	684420000	USD
CY2019Q4	us-gaap	Convertible Debt ConvertibleDebt	223971000	USD
CY2018Q4	us-gaap	Convertible Debt ConvertibleDebt	0	USD
CY2019Q4	us-gaap	Senior Notes SeniorNotes	96862000	USD
CY2018Q4	us-gaap	Senior Notes SeniorNotes	96816000	USD
CY2019Q4	mfa	Dividendsand Dividend Equivalents Payable DividendsandDividendEquivalentsPayable	90749000	USD
CY2018Q4	mfa	Dividendsand Dividend Equivalents Payable DividendsandDividendEquivalentsPayable	90198000	USD
CY2018Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	16280000	USD
CY2019Q4	us-gaap	Accounts Payable Other Current And Noncurrent AccountsPayableOtherCurrentAndNoncurrent	0	USD
CY2018Q4	us-gaap	Accounts Payable Other Current And Noncurrent AccountsPayableOtherCurrentAndNoncurrent	211129000	USD
CY2019Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	42819000	USD
CY2018Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	26296000	USD
CY2019Q4	us-gaap	Other Liabilities OtherLiabilities	1043591000	USD
CY2018Q4	us-gaap	Other Liabilities OtherLiabilities	1125139000	USD
CY2019	mfa	Operating Leases Number Of Operating Leases OperatingLeasesNumberOfOperatingLeases	3	lease
CY2019	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2700000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2700000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2700000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	2638000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	434000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	85000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	86000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	65000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	0	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	3308000	USD
CY2019	mfa	Grace Periodfor Paymentson New Space GracePeriodforPaymentsonNewSpace	P14M
CY2019Q4	mfa	Repurchase Loans Allowance RepurchaseLoansAllowance	0	USD
CY2019Q4	mfa	Unfunded Commitment UnfundedCommitment	130300000	USD
CY2013Q2	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.0750
CY2019	mfa	Maximum Times Series B Receives No Dividendsin Orderfor Voting Rights MaximumTimesSeriesBReceivesNoDividendsinOrderforVotingRights	6	quarter
CY2019Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2019Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2018Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2018Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2018Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2018Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2017Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2017Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2017Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2017Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2019Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	90700000	USD
CY2019Q4	mfa	Common Stock Dividends Capital Gains CommonStockDividendsCapitalGains	0.1672
CY2018Q4	mfa	Common Stock Dividends Capital Gains CommonStockDividendsCapitalGains	0.1290
CY2017Q4	mfa	Common Stock Dividends Capital Gains CommonStockDividendsCapitalGains	0.0831
CY2005Q3	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	4000000.0	shares
CY2013Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	10000000.0	shares
CY2019	mfa	Stock Repurchase Program Stock Repurchased And Retired During Period Shares StockRepurchaseProgramStockRepurchasedAndRetiredDuringPeriodShares	0	shares
CY2019Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	6616355	shares
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-3007000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-136097000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	75281000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	47234000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	52839000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	39739000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-50241000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-188936000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	35542000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	47234000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	52839000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	39739000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Debt Securities AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities	0	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Debt Securities AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities	224000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	378117000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	301801000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	322393000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	15000000	USD
CY2018	us-gaap	Dividends Preferred Stock DividendsPreferredStock	15000000	USD
CY2017	us-gaap	Dividends Preferred Stock DividendsPreferredStock	15000000	USD
CY2019	mfa	Participating Securities Distributedand Undistributed Earnings Loss Basicand Diluted ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted	1087000	USD
CY2018	mfa	Participating Securities Distributedand Undistributed Earnings Loss Basicand Diluted ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted	943000	USD
CY2017	mfa	Participating Securities Distributedand Undistributed Earnings Loss Basicand Diluted ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted	891000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	362030000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	285858000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	306502000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	450972000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	418934000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	388357000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.80
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.68
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	362030000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	285858000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	306502000	USD
CY2019	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	8965000	USD
CY2018	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	0	USD
CY2017	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	0	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	370995000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	285858000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	306502000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	450972000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	418934000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	388357000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	16797000	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	467769000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	418934000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	388357000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.79
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.68
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.79
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3300000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	12000000.0	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	3400000	shares
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9239000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8007000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8033000	USD
CY2019Q4	mfa	Employment Agreements Number Of Officers EmploymentAgreementsNumberOfOfficers	4	officer
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	6522565000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	8713810000	USD
CY2019Q4	mfa	Residential Whole Loans Heldat Fair Value Purchase Transaction Committedin Previous Period Closedin Subsequent Period ResidentialWholeLoansHeldatFairValuePurchaseTransactionCommittedinPreviousPeriodClosedinSubsequentPeriod	70600000	USD
CY2019Q4	mfa	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period At Acquisition At Fair Value Level3 Excluding Loan Purchase Price CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValueLevel3ExcludingLoanPurchasePrice	1381113000	USD
CY2018Q4	mfa	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period At Acquisition At Fair Value Level3 Excluding Loan Purchase Price CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValueLevel3ExcludingLoanPurchasePrice	1383502000	USD
CY2019Q4	mfa	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period At Acquisition At Fair Value Purchases Excludedfrom Level3 Fair Value Methodology Disclosures CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValuePurchasesExcludedfromLevel3FairValueMethodologyDisclosures	470000	USD
CY2018Q4	mfa	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period At Acquisition At Fair Value Purchases Excludedfrom Level3 Fair Value Methodology Disclosures CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValuePurchasesExcludedfromLevel3FairValueMethodologyDisclosures	282500000	USD
CY2019Q4	mfa	Other Real Estate Fair Value OtherRealEstateFairValue	257700000	USD
CY2018Q4	mfa	Other Real Estate Fair Value OtherRealEstateFairValue	215000000.0	USD
CY2019Q4	mfa	Loans Including Fair Value Loans Credit Impaired Loansand Other Loansat Carrying Value LoansIncludingFairValueLoansCreditImpairedLoansandOtherLoansatCarryingValue	7400000000	USD
CY2018Q4	mfa	Loans Including Fair Value Loans Credit Impaired Loansand Other Loansat Carrying Value LoansIncludingFairValueLoansCreditImpairedLoansandOtherLoansatCarryingValue	4700000000	USD
CY2019Q4	mfa	Residential Whole Loans Carrying Value ResidentialWholeLoansCarryingValue	6100000000	USD
CY2018Q4	mfa	Residential Whole Loans Carrying Value ResidentialWholeLoansCarryingValue	3000000000.0	USD
CY2019Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period At Acquisition At Fair Value CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue	1400000000	USD
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period At Acquisition At Fair Value CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue	1700000000	USD
CY2019Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	140952000	USD
CY2019Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	144935000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	142721000	USD
CY2019Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	153118000	USD
CY2019Q1	us-gaap	Interest Expense InterestExpense	79026000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	85044000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	85823000	USD
CY2019Q4	us-gaap	Interest Expense InterestExpense	82463000	USD
CY2019Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	61926000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	59891000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	56898000	USD
CY2019Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	70655000	USD
CY2019Q1	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	25267000	USD
CY2019Q2	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	51473000	USD
CY2019Q3	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	40175000	USD
CY2019Q4	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	41415000	USD
CY2019Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	24609000	USD
CY2019Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	7710000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	17708000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	11975000	USD
CY2019Q1	mfa	Noninterest Income Excluding Amounts Related To Mortgagebacked Securities And Linked Transactions NoninterestIncomeExcludingAmountsRelatedToMortgagebackedSecuritiesAndLinkedTransactions	1293000	USD
CY2019Q2	mfa	Noninterest Income Excluding Amounts Related To Mortgagebacked Securities And Linked Transactions NoninterestIncomeExcludingAmountsRelatedToMortgagebackedSecuritiesAndLinkedTransactions	-2321000	USD
CY2019Q3	mfa	Noninterest Income Excluding Amounts Related To Mortgagebacked Securities And Linked Transactions NoninterestIncomeExcludingAmountsRelatedToMortgagebackedSecuritiesAndLinkedTransactions	4546000	USD
CY2019Q4	mfa	Noninterest Income Excluding Amounts Related To Mortgagebacked Securities And Linked Transactions NoninterestIncomeExcludingAmountsRelatedToMortgagebackedSecuritiesAndLinkedTransactions	2007000	USD
CY2019Q1	us-gaap	Costs And Expenses CostsAndExpenses	24238000	USD
CY2019Q2	us-gaap	Costs And Expenses CostsAndExpenses	23713000	USD
CY2019Q3	us-gaap	Costs And Expenses CostsAndExpenses	23728000	USD
CY2019Q4	us-gaap	Costs And Expenses CostsAndExpenses	25431000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	88857000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	93040000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	95599000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	100621000	USD
CY2019Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
CY2019Q2	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
CY2019Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
CY2019Q4	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	85107000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	89290000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	91849000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	96871000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.19
CY2019Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.20
CY2019Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.20
CY2019Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.21
CY2018Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	103752000	USD
CY2018Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	101747000	USD
CY2018Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	117432000	USD
CY2018Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	132744000	USD
CY2018Q1	us-gaap	Interest Expense InterestExpense	50554000	USD
CY2018Q2	us-gaap	Interest Expense InterestExpense	51810000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	58878000	USD
CY2018Q4	us-gaap	Interest Expense InterestExpense	70944000	USD
CY2018Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	53198000	USD
CY2018Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	49937000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	58554000	USD
CY2018Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	61800000	USD
CY2018Q1	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	38498000	USD
CY2018Q2	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	32443000	USD
CY2018Q3	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	34942000	USD
CY2018Q4	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	31736000	USD
CY2018Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	8817000	USD
CY2018Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	7429000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	16415000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	28646000	USD
CY2018Q1	mfa	Noninterest Income Excluding Amounts Related To Mortgagebacked Securities And Linked Transactions NoninterestIncomeExcludingAmountsRelatedToMortgagebackedSecuritiesAndLinkedTransactions	345000	USD
CY2018Q2	mfa	Noninterest Income Excluding Amounts Related To Mortgagebacked Securities And Linked Transactions NoninterestIncomeExcludingAmountsRelatedToMortgagebackedSecuritiesAndLinkedTransactions	1134000	USD
CY2018Q3	mfa	Noninterest Income Excluding Amounts Related To Mortgagebacked Securities And Linked Transactions NoninterestIncomeExcludingAmountsRelatedToMortgagebackedSecuritiesAndLinkedTransactions	-2998000	USD
CY2018Q4	mfa	Noninterest Income Excluding Amounts Related To Mortgagebacked Securities And Linked Transactions NoninterestIncomeExcludingAmountsRelatedToMortgagebackedSecuritiesAndLinkedTransactions	-39432000	USD
CY2018Q1	us-gaap	Costs And Expenses CostsAndExpenses	17463000	USD
CY2018Q2	us-gaap	Costs And Expenses CostsAndExpenses	20548000	USD
CY2018Q3	us-gaap	Costs And Expenses CostsAndExpenses	19781000	USD
CY2018Q4	us-gaap	Costs And Expenses CostsAndExpenses	21871000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	83395000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	70395000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	87132000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	60879000	USD
CY2018Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
CY2018Q2	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
CY2018Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
CY2018Q4	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	79645000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	66645000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	83382000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	57129000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.20
CY2018Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.17
CY2018Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.19
CY2018Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.13

Files In Submission

Name	View Source	Status
0001055160-20-000006-index-headers.html	Edgar Link	pending
0001055160-20-000006-index.html	Edgar Link	pending
0001055160-20-000006.txt	Edgar Link	pending
0001055160-20-000006-xbrl.zip	Edgar Link	pending
exhibit21subsidiarieso.htm	Edgar Link	pending
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mfa-12312019x10k.htm	Edgar Link	pending
mfa-12312019x10k_htm.xml	Edgar Link	completed
mfa-20191231.xsd	Edgar Link	pending
mfa-20191231_cal.xml	Edgar Link	unprocessable
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$MFA
MFA FINANCIAL, INC. Stock $mfa

2019 Form 10-K Financial Statement

#000105516020000006 Filed on February 21, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MFA MFA FINANCIAL, INC. Stock $mfa

2019 Form 10-K Financial Statement

#000105516020000006 Filed on February 21, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MFA
MFA FINANCIAL, INC. Stock $mfa