$MFA
MFA FINANCIAL, INC. Stock $mfa

$mfa Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-Q Financial Statement

#000105516019000025 Filed on November 06, 2019

Income Statement

Concept	2019 Q4	2019 Q3	2018 Q3
Revenue	$153.1M	$142.7M	$117.4M
YoY Change	15.35%	21.54%	11.7%
Cost Of Revenue	$82.50M	$85.80M	$58.90M
YoY Change	16.36%	45.67%	19.47%
Gross Profit	$126.2M	$119.3M	$106.9M
YoY Change	50.24%	11.6%	25.76%
Gross Profit Margin	82.42%	83.59%	91.03%
Selling, General & Admin	$12.70M	$12.90M	$11.00M
YoY Change	6.72%	17.27%	-26.67%
% of Gross Profit	10.06%	10.81%	10.29%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$1.300M	$900.0K	$600.0K
YoY Change	225.0%	50.0%	-25.0%
% of Gross Profit	1.03%	0.75%	0.56%
Operating Expenses	$25.40M	$23.80M	$19.80M
YoY Change	15.98%	20.2%	-6.16%
Operating Profit	$100.8M	$95.50M	$87.10M
YoY Change	62.32%	9.64%	36.31%
Interest Expense	$82.46M	$85.82M	$58.88M
YoY Change	16.24%	45.76%	19.49%
% of Operating Profit	81.81%	89.87%	67.6%
Other Income/Expense, Net
YoY Change
Pretax Income	$100.6M	$95.60M	$87.10M
YoY Change	65.19%	9.76%	36.52%
Income Tax
% Of Pretax Income
Net Earnings	$100.6M	$95.60M	$87.13M
YoY Change	65.28%	9.72%	36.56%
Net Earnings / Revenue	65.71%	66.98%	74.2%
Basic Earnings Per Share		$0.20	$0.19
Diluted Earnings Per Share	$209.1K	$0.20	$0.19
COMMON SHARES
Basic Shares Outstanding	451.8M shares	451.0M shares	428.7M shares
Diluted Shares Outstanding		479.9M shares	428.7M shares

Balance Sheet

Concept	2019 Q4	2019 Q3	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$71.00M	$154.0M	$104.0M
YoY Change	36.54%	48.08%	-82.89%
Cash & Equivalents	$70.60M	$154.2M	$104.2M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$71.00M	$154.0M	$104.0M
YoY Change	36.54%	48.08%	-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	$12.18B	$11.27B
YoY Change	7.18%	8.09%	9.95%
Other Assets	$64.00M	$39.00M	$6.000M
YoY Change	72.97%	550.0%	-60.0%
Total Long-Term Assets	$13.50B	$12.95B	$11.68B
YoY Change	9.13%	10.9%	11.27%
TOTAL ASSETS
Total Short-Term Assets	$71.00M	$154.0M	$104.0M
Total Long-Term Assets	$13.50B	$12.95B	$11.68B
Total Assets	$13.57B	$13.10B	$11.78B
YoY Change	9.24%	11.23%	6.11%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$62.00M	$54.00M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$8.571B	$7.278B
YoY Change	-100.0%	17.77%	5.92%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$153.0M	$8.716B	$7.278B
YoY Change	-98.06%	19.76%	5.92%
LONG-TERM LIABILITIES
Long-Term Debt	$10.03B	$986.0M	$0.00
YoY Change	4654.5%		-100.0%
Other Long-Term Liabilities			$951.0M
YoY Change			8.31%
Total Long-Term Liabilities	$10.03B	$986.0M	$951.0M
YoY Change	791.73%	3.68%	-2.46%
TOTAL LIABILITIES
Total Short-Term Liabilities	$153.0M	$8.716B	$7.278B
Total Long-Term Liabilities	$10.03B	$986.0M	$951.0M
Total Liabilities	$10.18B	$9.701B	$8.230B
YoY Change	13.1%	17.88%	4.89%
SHAREHOLDERS EQUITY
Retained Earnings	-$631.0M	-$637.2M	-$599.0M
YoY Change	-0.16%	6.38%	0.49%
Common Stock	$4.524M	$4.517M	$4.495M
YoY Change	0.58%	0.49%	13.25%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.384B	$3.403B	$3.552B
YoY Change
Total Liabilities & Shareholders Equity	$13.57B	$13.10B	$11.78B
YoY Change	9.24%	11.23%	6.11%

Cashflow Statement

Concept	2019 Q4	2019 Q3	2018 Q3
OPERATING ACTIVITIES
Net Income	$100.6M	$95.60M	$87.13M
YoY Change	65.28%	9.72%	36.56%
Depreciation, Depletion And Amortization	$1.300M	$900.0K	$600.0K
YoY Change	225.0%	50.0%	-25.0%
Cash From Operating Activities	$62.20M	$67.70M	$46.50M
YoY Change	7.99%	45.59%	101.3%
INVESTING ACTIVITIES
Capital Expenditures	-$500.0K	-$400.0K	-$400.0K
YoY Change	400.0%	0.0%	33.33%
Acquisitions
YoY Change
Other Investing Activities	-$569.9M	$174.3M	-$1.879B
YoY Change	4.63%	-109.28%	-2114.15%
Cash From Investing Activities	-$570.4M	$174.1M	-$1.880B
YoY Change	4.7%	-109.26%	-2121.18%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	449.7M	-168.2M	1.886B
YoY Change	-3.21%	-108.92%	-854.88%
NET CHANGE
Cash From Operating Activities	62.20M	67.70M	46.50M
Cash From Investing Activities	-570.4M	174.1M	-1.880B
Cash From Financing Activities	449.7M	-168.2M	1.886B
Net Change In Cash	-58.50M	73.60M	52.50M
YoY Change	158.85%	40.19%	-139.27%
FREE CASH FLOW
Cash From Operating Activities	$62.20M	$67.70M	$46.50M
Capital Expenditures	-$500.0K	-$400.0K	-$400.0K
Free Cash Flow	$62.70M	$68.10M	$46.90M
YoY Change	8.67%	45.2%	100.43%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
	dei	Entity Central Index Key EntityCentralIndexKey	0001055160
	mfa	Mortgage Backed Securities Period Of Fixed Rate Mortgages Minimum MortgageBackedSecuritiesPeriodOfFixedRateMortgagesMinimum	P15Y
	mfa	Mortgage Backed Securities Periodof Fixed Rate Mortgages Maximum MortgageBackedSecuritiesPeriodofFixedRateMortgagesMaximum	P30Y
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	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	0	USD
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	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	1-13991
	dei	Entity Registrant Name EntityRegistrantName	MFA FINANCIAL, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-3974868
	dei	Entity Address Address Line1 EntityAddressAddressLine1	350 Park Avenue, 20th Floor
	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10022
	dei	City Area Code CityAreaCode	212
	dei	Local Phone Number LocalPhoneNumber	207-6400
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2018Q3	us-gaap	Costs And Expenses CostsAndExpenses	19781000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	71679000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	57792000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	95599000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	87132000	USD
	us-gaap	Net Income Loss NetIncomeLoss	277496000	USD
	us-gaap	Net Income Loss NetIncomeLoss	240922000	USD
CY2019Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
CY2018Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	11250000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	11250000	USD
CY2019Q3	mfa	Net Income Loss Availableto Common Stockholders Basicand Participating Securities NetIncomeLossAvailabletoCommonStockholdersBasicandParticipatingSecurities	91849000	USD
CY2018Q3	mfa	Net Income Loss Availableto Common Stockholders Basicand Participating Securities NetIncomeLossAvailabletoCommonStockholdersBasicandParticipatingSecurities	83382000	USD
	mfa	Net Income Loss Availableto Common Stockholders Basicand Participating Securities NetIncomeLossAvailabletoCommonStockholdersBasicandParticipatingSecurities	266246000	USD
	mfa	Net Income Loss Availableto Common Stockholders Basicand Participating Securities NetIncomeLossAvailabletoCommonStockholdersBasicandParticipatingSecurities	229672000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.59
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.58
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	95599000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	87132000	USD
	us-gaap	Net Income Loss NetIncomeLoss	277496000	USD
	us-gaap	Net Income Loss NetIncomeLoss	240922000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	14499000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	9455000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	36370000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	25580000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-233000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	5390000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-30384000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	32974000	USD
CY2019Q3	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	-685000	USD
CY2018Q3	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	0	USD
	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	-1769000	USD
	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9934000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-38343000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-18438000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-82856000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	85665000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	48789000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	259058000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	158066000	USD
CY2019Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
CY2018Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	3750000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	11250000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	11250000	USD
CY2019Q3	mfa	Comprehensive Income Loss To Common Stockholders And Participating Securities ComprehensiveIncomeLossToCommonStockholdersAndParticipatingSecurities	81915000	USD
CY2018Q3	mfa	Comprehensive Income Loss To Common Stockholders And Participating Securities ComprehensiveIncomeLossToCommonStockholdersAndParticipatingSecurities	45039000	USD
	mfa	Comprehensive Income Loss To Common Stockholders And Participating Securities ComprehensiveIncomeLossToCommonStockholdersAndParticipatingSecurities	247808000	USD
	mfa	Comprehensive Income Loss To Common Stockholders And Participating Securities ComprehensiveIncomeLossToCommonStockholdersAndParticipatingSecurities	146816000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	3416101000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	88857000	USD
CY2019Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	551000	USD
CY2019Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	2610000	USD
CY2019Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	992000	USD
CY2019Q1	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	435000	USD
CY2019Q1	us-gaap	Dividends Common Stock DividendsCommonStock	90097000	USD
CY2019Q1	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3750000	USD
CY2019Q1	mfa	Dividends Dividend Equivalent Rights DividendsDividendEquivalentRights	256000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	5094000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-10786000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	3404531000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	93040000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	586000	USD
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2438000	USD
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	-260000	USD
CY2019Q2	us-gaap	Dividends Common Stock DividendsCommonStock	90124000	USD
CY2019Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3750000	USD
CY2019Q2	mfa	Dividends Dividend Equivalent Rights DividendsDividendEquivalentRights	276000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	17637000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-20449000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	3403373000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	95599000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	7724000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1288000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	-260000	USD
CY2019Q3	us-gaap	Dividends Common Stock DividendsCommonStock	90338000	USD
CY2019Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3750000	USD
CY2019Q3	mfa	Dividends Dividend Equivalent Rights DividendsDividendEquivalentRights	276000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-9016000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-918000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	3403426000	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
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	83395000	USD
CY2018Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1230000	USD
CY2018Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1957000	USD
CY2018Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	549000	USD
CY2018Q1	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	430000	USD
CY2018Q1	us-gaap	Dividends Common Stock DividendsCommonStock	79686000	USD
CY2018Q1	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3750000	USD
CY2018Q1	mfa	Dividends Dividend Equivalent Rights DividendsDividendEquivalentRights	217000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-46163000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	19669000	USD
CY2018Q1	us-gaap	Stockholders Equity StockholdersEquity	3235431000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	70395000	USD
CY2018Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	481000	USD
CY2018Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2255000	USD
CY2018Q2	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	-230000	USD
CY2018Q2	us-gaap	Dividends Common Stock DividendsCommonStock	79706000	USD
CY2018Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3750000	USD
CY2018Q2	mfa	Dividends Dividend Equivalent Rights DividendsDividendEquivalentRights	244000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-25934000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	7915000	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	3206613000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	87132000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	389871000	USD
CY2018Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1082000	USD
CY2018Q3	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	-230000	USD
CY2018Q3	us-gaap	Dividends Common Stock DividendsCommonStock	89894000	USD
CY2018Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3750000	USD
CY2018Q3	mfa	Dividends Dividend Equivalent Rights DividendsDividendEquivalentRights	241000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-43733000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	5390000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	3552240000	USD
	us-gaap	Net Income Loss NetIncomeLoss	277496000	USD
	us-gaap	Net Income Loss NetIncomeLoss	240922000	USD
	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	50027000	USD
	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	32661000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	5785000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	6582000	USD
	mfa	Gainon Liquidationof Residential Whole Loans GainonLiquidationofResidentialWholeLoans	14538000	USD
	mfa	Gainon Liquidationof Residential Whole Loans GainonLiquidationofResidentialWholeLoans	18598000	USD
	mfa	Accretionof Purchase Discounts AccretionofPurchaseDiscounts	45990000	USD
	mfa	Accretionof Purchase Discounts AccretionofPurchaseDiscounts	64211000	USD
	mfa	Amortization Of Purchase Premiums AmortizationOfPurchasePremiums	32085000	USD
	mfa	Amortization Of Purchase Premiums AmortizationOfPurchasePremiums	21141000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1957000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1354000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	4724000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3891000	USD
	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	33313000	USD
	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	26788000	USD
	mfa	Unrealized Losses Gainson Securities Held At Fair Valueand Swaps Not Designatedas Hedges UnrealizedLossesGainsonSecuritiesHeldAtFairValueandSwapsNotDesignatedasHedges	122000	USD
	mfa	Unrealized Losses Gainson Securities Held At Fair Valueand Swaps Not Designatedas Hedges UnrealizedLossesGainsonSecuritiesHeldAtFairValueandSwapsNotDesignatedasHedges	-2767000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	24647000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	31018000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	11756000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	33000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	153596000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	90250000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	1555449000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Other Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments	1797012000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	735768000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	341589000	USD
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	837591000	USD
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	2021914000	USD
	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	2988229000	USD
	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	2158105000	USD
	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	906072000	USD
	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	345917000	USD
	mfa	Proceeds From Real Estate Owned ProceedsFromRealEstateOwned	81206000	USD
	mfa	Proceeds From Real Estate Owned ProceedsFromRealEstateOwned	93635000	USD
	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	15671000	USD
	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	10179000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1351000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1009000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-564347000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1613054000	USD
	mfa	Principal Paymentson Securities Soldunder Agreementsto Repurchaseand Other Advances PrincipalPaymentsonSecuritiesSoldunderAgreementstoRepurchaseandOtherAdvances	54103776000	USD
	mfa	Principal Paymentson Securities Soldunder Agreementsto Repurchaseand Other Advances PrincipalPaymentsonSecuritiesSoldunderAgreementstoRepurchaseandOtherAdvances	48988034000	USD
	mfa	Proceedsfrom Securities Soldunder Agreementsto Repurchase ProceedsfromSecuritiesSoldunderAgreementstoRepurchase	54796010000	USD
	mfa	Proceedsfrom Securities Soldunder Agreementsto Repurchase ProceedsfromSecuritiesSoldunderAgreementstoRepurchase	49651416000	USD
	mfa	Proceedsfrom Issuanceof Securitized Debt ProceedsfromIssuanceofSecuritizedDebt	0	USD
	mfa	Proceedsfrom Issuanceof Securitized Debt ProceedsfromIssuanceofSecuritizedDebt	419970000	USD
	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	79350000	USD
	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	67945000	USD
	mfa	Payments Madefor Securitization Related Cost PaymentsMadeforSecuritizationRelatedCost	0	USD
	mfa	Payments Madefor Securitization Related Cost PaymentsMadeforSecuritizationRelatedCost	2472000	USD
	us-gaap	Proceeds From Convertible Debt ProceedsFromConvertibleDebt	223311000	USD
	us-gaap	Proceeds From Convertible Debt ProceedsFromConvertibleDebt	0	USD
	mfa	Payments Made For Margin Calls On Repurchase Agreements And Derivatives PaymentsMadeForMarginCallsOnRepurchaseAgreementsAndDerivatives	47622000	USD
	mfa	Payments Made For Margin Calls On Repurchase Agreements And Derivatives PaymentsMadeForMarginCallsOnRepurchaseAgreementsAndDerivatives	40885000	USD
	mfa	Proceeds From Margin Calls On Repurchase Agreements And Derivatives ProceedsFromMarginCallsOnRepurchaseAgreementsAndDerivatives	0	USD
	mfa	Proceeds From Margin Calls On Repurchase Agreements And Derivatives ProceedsFromMarginCallsOnRepurchaseAgreementsAndDerivatives	57656000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	8861000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	391932000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	0	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	350000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	11250000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	11250000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	270951000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	239623000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	515233000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1170415000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	104482000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-352389000	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
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	193191000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	111354000	USD
	us-gaap	Interest Paid Net InterestPaidNet	237644000	USD
	us-gaap	Interest Paid Net InterestPaidNet	161028000	USD
	mfa	Securities Obtained As Collateral Net Of Returns SecuritiesObtainedAsCollateralNetOfReturns	0	USD
	mfa	Securities Obtained As Collateral Net Of Returns SecuritiesObtainedAsCollateralNetOfReturns	-505850000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	193531000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	161572000	USD
CY2019Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	90614000	USD
CY2018Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	90136000	USD
	mfa	Noncash Payablefor Unsettled Loan Purchases NoncashPayableforUnsettledLoanPurchases	59524000	USD
	mfa	Noncash Payablefor Unsettled Loan Purchases NoncashPayableforUnsettledLoanPurchases	10888000	USD
	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;">o</span><span style="font-family:inherit;font-size:10pt;">))</span></div>
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	segment
	mfa	Number Of Days Considered To Classify Loans Delinquent NumberOfDaysConsideredToClassifyLoansDelinquent	P60D
	mfa	Number Of Days Considered To Classify Loans Delinquent NumberOfDaysConsideredToClassifyLoansDelinquent	P60D
	mfa	Ratio Loan To Value RatioLoanToValue	0.80
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	154200000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	52000000.0	USD
CY2019Q3	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	130400000	USD
CY2018Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	30000000.0	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	39000000.0	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	36700000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	7200000	USD
	mfa	Repurchase Agreements Financing Period Low End Of Range RepurchaseAgreementsFinancingPeriodLowEndOfRange	P1M
	mfa	Repurchase Agreements Financing Period High End Of Range RepurchaseAgreementsFinancingPeriodHighEndOfRange	P6M
	mfa	Repurchase Agreements Financing Collateralized Period Low Endof Range RepurchaseAgreementsFinancingCollateralizedPeriodLowEndofRange	P3M
	mfa	Repurchase Agreements Financing Collateralized Period High Endof Range RepurchaseAgreementsFinancingCollateralizedPeriodHighEndofRange	P12M
	mfa	Percentage Of Annual Reit Taxable Income Distributed To Stockholders PercentageOfAnnualREITTaxableIncomeDistributedToStockholders	1
	mfa	Percentage Of Annual Reit Taxable Income Distributed To Stockholders PercentageOfAnnualREITTaxableIncomeDistributedToStockholders	1
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	0	USD
	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-26000000.0	USD
CY2019Q3	us-gaap	Investment Owned Balance Principal Amount InvestmentOwnedBalancePrincipalAmount	4641832000	USD
CY2019Q3	mfa	Available For Sale Securities Purchase Premiums AvailableForSaleSecuritiesPurchasePremiums	74178000	USD
CY2019Q3	mfa	Available For Sale Securities Accretable Purchase Discounts AvailableForSaleSecuritiesAccretablePurchaseDiscounts	102437000	USD
CY2019Q3	mfa	Available For Sale Securities Discount Designated As Credit Reserve And Other Than Temporary Impairments AvailableForSaleSecuritiesDiscountDesignatedAsCreditReserveAndOtherThanTemporaryImpairments	462095000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	4152443000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	456885000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	19774000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax	437111000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	4589554000	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
CY2019Q3	mfa	Available For Sale Securities Principal Payments Receivable AvailableForSaleSecuritiesPrincipalPaymentsReceivable	965000	USD
CY2018Q4	mfa	Available For Sale Securities Principal Payments Receivable AvailableForSaleSecuritiesPrincipalPaymentsReceivable	1000000.0	USD
CY2019Q3	us-gaap	Proceeds From Sale Of Mortgage Backed Securities Mbs Categorized As Available For Sale ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	334125000	USD
CY2019Q3	us-gaap	Gain Loss On Sales Of Mortgage Backed Securities Mbs GainLossOnSalesOfMortgageBackedSecuritiesMBS	17708000	USD
CY2018Q3	us-gaap	Proceeds From Sale Of Mortgage Backed Securities Mbs Categorized As Available For Sale ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	143196000	USD
CY2018Q3	us-gaap	Gain Loss On Sales Of Mortgage Backed Securities Mbs GainLossOnSalesOfMortgageBackedSecuritiesMBS	16415000	USD
	us-gaap	Proceeds From Sale Of Mortgage Backed Securities Mbs Categorized As Available For Sale ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	738919000	USD
	us-gaap	Gain Loss On Sales Of Mortgage Backed Securities Mbs GainLossOnSalesOfMortgageBackedSecuritiesMBS	50027000	USD
	us-gaap	Proceeds From Sale Of Mortgage Backed Securities Mbs Categorized As Available For Sale ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	341886000	USD
	us-gaap	Gain Loss On Sales Of Mortgage Backed Securities Mbs GainLossOnSalesOfMortgageBackedSecuritiesMBS	32661000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	45973000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	156000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	28	security
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	859147000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	19618000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	392	security
CY2019Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	905120000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	19774000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	0	USD
CY2019Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	39596000	USD
CY2018Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	39596000	USD
CY2019Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2018Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2019Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	0	USD
CY2018Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	0	USD
CY2019Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	39596000	USD
CY2018Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	39596000	USD
CY2019Q2	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	439898000	USD
CY2018Q2	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	548551000	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
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	14499000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	9455000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	36370000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	25580000	USD
CY2019Q3	mfa	Other Comprehensive Income Loss Availableforsale Securities Adjustment Excluding Cumulative Effect Netof Tax Portion Attributableto Parent OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentExcludingCumulativeEffectNetofTaxPortionAttributabletoParent	-9016000	USD
CY2018Q3	mfa	Other Comprehensive Income Loss Availableforsale Securities Adjustment Excluding Cumulative Effect Netof Tax Portion Attributableto Parent OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentExcludingCumulativeEffectNetofTaxPortionAttributabletoParent	-43733000	USD
	mfa	Other Comprehensive Income Loss Availableforsale Securities Adjustment Excluding Cumulative Effect Netof Tax Portion Attributableto Parent OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentExcludingCumulativeEffectNetofTaxPortionAttributabletoParent	13715000	USD
	mfa	Other Comprehensive Income Loss Availableforsale Securities Adjustment Excluding Cumulative Effect Netof Tax Portion Attributableto Parent OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentExcludingCumulativeEffectNetofTaxPortionAttributabletoParent	-115830000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	430882000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	504818000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	430882000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	504818000	USD
CY2019Q3	mfa	Loans Including Fair Value Loans Credit Impaired Loansand Other Loansat Carrying Value LoansIncludingFairValueLoansCreditImpairedLoansandOtherLoansatCarryingValue	6400000000	USD
CY2018Q4	mfa	Loans Including Fair Value Loans Credit Impaired Loansand Other Loansat Carrying Value LoansIncludingFairValueLoansCreditImpairedLoansandOtherLoansatCarryingValue	4700000000	USD
CY2019Q3	mfa	Purchased Performing Loans PurchasedPerformingLoans	4251217000	USD
CY2018Q4	mfa	Purchased Performing Loans PurchasedPerformingLoans	2218728000	USD
CY2019Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet	718197000	USD
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount Net CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet	797987000	USD
CY2019Q3	mfa	Residential Whole Loans Carrying Value ResidentialWholeLoansCarryingValue	4969414000	USD
CY2018Q4	mfa	Residential Whole Loans Carrying Value ResidentialWholeLoansCarryingValue	3016715000	USD
CY2019Q3	mfa	Residential Whole Loans ResidentialWholeLoans	14968	loan
CY2018Q4	mfa	Residential Whole Loans ResidentialWholeLoans	11149	loan
CY2019Q3	mfa	Residential Whole Loans Heldat Fair Value Excluded Purchase Transaction Not Yet Closed ResidentialWholeLoansHeldatFairValueExcludedPurchaseTransactionNotYetClosed	59500000	USD
CY2018Q3	mfa	Purchase Credit Impaired Loans Purchase Transaction Committed In Previous Period Closedin Subsequent Period PurchaseCreditImpairedLoansPurchaseTransactionCommittedInPreviousPeriodClosedinSubsequentPeriod	54900000	USD
CY2019Q2	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	376264000	USD
CY2017Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	421872000	USD
CY2019Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	0	USD
CY2018Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	41947000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	0	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	41947000	USD
CY2019Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	10635000	USD
CY2018Q2	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	401075000	USD
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	415330000	USD
CY2018Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	11198000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	33031000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	33139000	USD
CY2019Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	11399000	USD
CY2018Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	8378000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	33695000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	23388000	USD
CY2019Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications To From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference	3892000	USD
CY2018Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications To From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference	9694000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications To From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference	9518000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications To From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference	25848000	USD
CY2019Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	358122000	USD
CY2018Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	433140000	USD
CY2019Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	358122000	USD
CY2018Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	433140000	USD
CY2018Q3	mfa	Purchase Credit Impaired Loans Purchase Transaction Committed In Previous Period Closedin Subsequent Period PurchaseCreditImpairedLoansPurchaseTransactionCommittedInPreviousPeriodClosedinSubsequentPeriod	54900000	USD
CY2019Q3	mfa	Certain Loans Acquiredin Transfer Not Accountedforas Debt Securities Acquired During Periodat Acquisitionat Fair Value Excluding Unsettled Loans CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesAcquiredDuringPeriodatAcquisitionatFairValueExcludingUnsettledLoans	1453169000	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 Yet Closed ResidentialWholeLoansHeldatFairValueExcludedPurchaseTransactionNotYetClosed	194700000	USD
CY2019Q3	mfa	Residential Whole Loans Fair Value Net Income Loss Coupon Payments Received ResidentialWholeLoansFairValueNetIncomeLossCouponPaymentsReceived	20176000	USD
CY2018Q3	mfa	Residential Whole Loans Fair Value Net Income Loss Coupon Payments Received ResidentialWholeLoansFairValueNetIncomeLossCouponPaymentsReceived	17634000	USD
	mfa	Residential Whole Loans Fair Value Net Income Loss Coupon Payments Received ResidentialWholeLoansFairValueNetIncomeLossCouponPaymentsReceived	61060000	USD
	mfa	Residential Whole Loans Fair Value Net Income Loss Coupon Payments Received ResidentialWholeLoansFairValueNetIncomeLossCouponPaymentsReceived	52034000	USD
CY2019Q3	mfa	Residential Whole Loans Fair Value Net Income Loss Unrealized Gains Losses Net ResidentialWholeLoansFairValueNetIncomeLossUnrealizedGainsLossesNet	13185000	USD
CY2018Q3	mfa	Residential Whole Loans Fair Value Net Income Loss Unrealized Gains Losses Net ResidentialWholeLoansFairValueNetIncomeLossUnrealizedGainsLossesNet	8442000	USD
	mfa	Residential Whole Loans Fair Value Net Income Loss Unrealized Gains Losses Net ResidentialWholeLoansFairValueNetIncomeLossUnrealizedGainsLossesNet	33312000	USD
	mfa	Residential Whole Loans Fair Value Net Income Loss Unrealized Gains Losses Net ResidentialWholeLoansFairValueNetIncomeLossUnrealizedGainsLossesNet	26788000	USD
CY2019Q3	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Payoffor Liquidationof Loans ResidentialWholeLoansFairValueNetIncomeLossGainLossonPayofforLiquidationofLoans	2026000	USD
CY2018Q3	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Payoffor Liquidationof Loans ResidentialWholeLoansFairValueNetIncomeLossGainLossonPayofforLiquidationofLoans	3251000	USD
	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Payoffor Liquidationof Loans ResidentialWholeLoansFairValueNetIncomeLossGainLossonPayofforLiquidationofLoans	6906000	USD
	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Payoffor Liquidationof Loans ResidentialWholeLoansFairValueNetIncomeLossGainLossonPayofforLiquidationofLoans	10203000	USD
CY2019Q3	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Transfersto Reo ResidentialWholeLoansFairValueNetIncomeLossGainLossonTransferstoREO	4788000	USD
CY2018Q3	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Transfersto Reo ResidentialWholeLoansFairValueNetIncomeLossGainLossonTransferstoREO	5615000	USD
CY2019Q3	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	40175000	USD
	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Transfersto Reo ResidentialWholeLoansFairValueNetIncomeLossGainLossonTransferstoREO	15637000	USD
	mfa	Residential Whole Loans Fair Value Net Income Loss Gain Losson Transfersto Reo ResidentialWholeLoansFairValueNetIncomeLossGainLossonTransferstoREO	16858000	USD
CY2018Q3	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	34942000	USD
	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	116915000	USD
	mfa	Mortgage Loanson Real Estate Gain Losson Loansat Fair Value MortgageLoansonRealEstateGainLossonLoansatFairValue	105883000	USD
CY2019Q3	us-gaap	Real Estate Investments RealEstateInvestments	376200000	USD
CY2018Q4	us-gaap	Real Estate Investments RealEstateInvestments	249413000	USD
CY2019Q3	mfa	Capital Contributionsto Loan Origination Partners CapitalContributionstoLoanOriginationPartners	122903000	USD
CY2018Q4	mfa	Capital Contributionsto Loan Origination Partners CapitalContributionstoLoanOriginationPartners	23210000	USD
CY2019Q3	us-gaap	Other Interest Earning Assets OtherInterestEarningAssets	87896000	USD
CY2018Q4	us-gaap	Other Interest Earning Assets OtherInterestEarningAssets	92022000	USD
CY2019Q3	us-gaap	Interest Receivable And Other Assets InterestReceivableAndOtherAssets	102715000	USD
CY2018Q4	us-gaap	Interest Receivable And Other Assets InterestReceivableAndOtherAssets	130964000	USD
CY2019Q3	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	45495000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	32176000	USD
CY2019Q3	us-gaap	Other Assets OtherAssets	735209000	USD
CY2018Q4	us-gaap	Other Assets OtherAssets	527785000	USD
CY2019Q3	mfa	Real Estate Heldfor Investment RealEstateHeldforInvestment	19600000	USD
CY2019Q3	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	1508	property
CY2019Q3	us-gaap	Real Estate Investments RealEstateInvestments	376200000	USD
CY2018Q4	us-gaap	Real Estate Investments RealEstateInvestments	249413000	USD
CY2018Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	1093	property
CY2018Q4	us-gaap	Real Estate Investments RealEstateInvestments	249400000	USD
CY2019Q3	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	370900000	USD
CY2019Q1	us-gaap	Real Estate Investments RealEstateInvestments	334069000	USD
CY2018Q1	us-gaap	Real Estate Investments RealEstateInvestments	192162000	USD
CY2017Q4	us-gaap	Real Estate Investments RealEstateInvestments	152356000	USD
CY2019Q3	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	3875000	USD
CY2018Q3	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	4056000	USD
	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	9264000	USD
	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	11592000	USD
CY2019Q3	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	61888000	USD
CY2018Q3	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	58051000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	193531000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	161572000	USD
CY2019Q3	mfa	Real Estate Investments Additions RealEstateInvestmentsAdditions	5108000	USD
CY2018Q3	mfa	Real Estate Investments Additions RealEstateInvestmentsAdditions	4897000	USD
	mfa	Real Estate Investments Additions RealEstateInvestmentsAdditions	16307000	USD
	mfa	Real Estate Investments Additions RealEstateInvestmentsAdditions	10179000	USD
CY2019Q3	mfa	Real Estate Investments Disposals RealEstateInvestmentsDisposals	20990000	USD
CY2018Q3	mfa	Real Estate Investments Disposals RealEstateInvestmentsDisposals	27949000	USD
	mfa	Real Estate Investments Disposals RealEstateInvestmentsDisposals	73787000	USD
	mfa	Real Estate Investments Disposals RealEstateInvestmentsDisposals	89410000	USD
CY2019Q3	us-gaap	Real Estate Investments RealEstateInvestments	376200000	USD
CY2018Q3	us-gaap	Real Estate Investments RealEstateInvestments	223105000	USD
CY2019Q3	us-gaap	Real Estate Investments RealEstateInvestments	376200000	USD
CY2018Q3	us-gaap	Real Estate Investments RealEstateInvestments	223105000	USD
CY2019Q3	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	1508	property
CY2018Q3	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	979	property
CY2019Q3	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	1508	property
CY2018Q3	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	979	property
CY2019Q3	mfa	Gainrecordedontransferfromresidentialwholeloanstorealestateowned Gainrecordedontransferfromresidentialwholeloanstorealestateowned	5000000.0	USD
CY2018Q3	mfa	Gainrecordedontransferfromresidentialwholeloanstorealestateowned Gainrecordedontransferfromresidentialwholeloanstorealestateowned	5800000	USD
	mfa	Gainrecordedontransferfromresidentialwholeloanstorealestateowned Gainrecordedontransferfromresidentialwholeloanstorealestateowned	16100000	USD
	mfa	Gainrecordedontransferfromresidentialwholeloanstorealestateowned Gainrecordedontransferfromresidentialwholeloanstorealestateowned	17000000.0	USD
CY2019Q3	mfa	Numberof Real Estate Properties Sold During Period NumberofRealEstatePropertiesSoldDuringPeriod	142	property
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CY2019Q3	us-gaap	Proceeds From Sale Of Real Estate ProceedsFromSaleOfRealEstate	23000000.0	USD
	us-gaap	Proceeds From Sale Of Real Estate ProceedsFromSaleOfRealEstate	80000000.0	USD
CY2019Q3	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2100000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	5800000	USD
CY2018Q3	mfa	Numberof Real Estate Properties Sold During Period NumberofRealEstatePropertiesSoldDuringPeriod	157	property
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CY2018Q3	us-gaap	Proceeds From Sale Of Real Estate ProceedsFromSaleOfRealEstate	29900000	USD
	us-gaap	Proceeds From Sale Of Real Estate ProceedsFromSaleOfRealEstate	96000000.0	USD
CY2018Q3	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2000000.0	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	6600000	USD
CY2019Q2	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-28114000	USD
CY2018Q2	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	16160000	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
CY2019Q3	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-233000	USD
CY2018Q3	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	5390000	USD
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-30384000	USD
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	32974000	USD
CY2019Q3	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	-685000	USD
CY2018Q3	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	0	USD
	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	-1769000	USD
	mfa	Other Comprehensive Income Loss Amortizationof De Designated Hedging Instrumentsafter Reclassificationand Tax OtherComprehensiveIncomeLossAmortizationofDeDesignatedHedgingInstrumentsafterReclassificationandTax	0	USD
CY2019Q3	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-29032000	USD
CY2018Q3	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	21550000	USD
CY2019Q3	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-29032000	USD
CY2018Q3	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	21550000	USD
CY2019Q3	mfa	Securities Sold Under Agreements To Repurchase Subject To Termination SecuritiesSoldUnderAgreementsToRepurchaseSubjectToTermination	1700000000	USD
CY2019Q3	mfa	Repurchase Agreements Number Of Counterparties RepurchaseAgreementsNumberOfCounterparties	28	counterparty
CY2018Q4	mfa	Repurchase Agreements Number Of Counterparties RepurchaseAgreementsNumberOfCounterparties	26	counterparty
CY2019Q3	mfa	Repurchase Agreement Counterparty Risk As Percentage Of Stockholders Equity RepurchaseAgreementCounterpartyRiskAsPercentageOfStockholdersEquity	0.05
CY2019Q3	us-gaap	Pledged Assets Separately Reported Securities Pledged For Repurchase Agreements At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedForRepurchaseAgreementsAtFairValue	10700000000	USD
CY2018Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged For Repurchase Agreements At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedForRepurchaseAgreementsAtFairValue	9500000000	USD
CY2019Q3	mfa	Pledged Financial Instruments Not Separately Reported Securities Pledged Aggregate Fair Value And Accrued Interest PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledgedAggregateFairValueAndAccruedInterest	48500000	USD
CY2018Q4	mfa	Pledged Financial Instruments Not Separately Reported Securities Pledged Aggregate Fair Value And Accrued Interest PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledgedAggregateFairValueAndAccruedInterest	33100000	USD
CY2019Q3	us-gaap	Securities Sold Under Agreements To Repurchase Fair Value Of Collateral SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral	10600000000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase Fair Value Of Collateral SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral	9400000000	USD
CY2019Q3	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	2300000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	2700000	USD
CY2019Q3	us-gaap	Other Secured Financings OtherSecuredFinancings	605712000	USD
CY2018Q4	us-gaap	Other Secured Financings OtherSecuredFinancings	684420000	USD
CY2019Q3	us-gaap	Convertible Debt ConvertibleDebt	223684000	USD
CY2018Q4	us-gaap	Convertible Debt ConvertibleDebt	0	USD
CY2019Q3	us-gaap	Senior Notes SeniorNotes	96850000	USD
CY2018Q4	us-gaap	Senior Notes SeniorNotes	96816000	USD
CY2019Q3	mfa	Dividendsand Dividend Equivalents Payable DividendsandDividendEquivalentsPayable	90614000	USD
CY2018Q4	mfa	Dividendsand Dividend Equivalents Payable DividendsandDividendEquivalentsPayable	90198000	USD
CY2019Q3	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	20463000	USD
CY2018Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	16280000	USD
CY2019Q3	us-gaap	Accounts Payable Other Current And Noncurrent AccountsPayableOtherCurrentAndNoncurrent	59524000	USD
CY2018Q4	us-gaap	Accounts Payable Other Current And Noncurrent AccountsPayableOtherCurrentAndNoncurrent	211129000	USD
CY2019Q3	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	33126000	USD
CY2018Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	26296000	USD
CY2019Q3	us-gaap	Other Liabilities OtherLiabilities	1129973000	USD
CY2018Q4	us-gaap	Other Liabilities OtherLiabilities	1125139000	USD
	mfa	Operating Leases Number Of Operating Leases OperatingLeasesNumberOfOperatingLeases	3	lease
CY2019Q3	mfa	Repurchase Loans Allowance RepurchaseLoansAllowance	0	USD
CY2019Q3	mfa	Unfunded Commitment UnfundedCommitment	126000000.0	USD
	mfa	Maximum Times Series B Receives No Dividendsin Orderfor Voting Rights MaximumTimesSeriesBReceivesNoDividendsinOrderforVotingRights	6	quarter
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	87132000	USD
	us-gaap	Net Income Loss NetIncomeLoss	277496000	USD
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
CY2019Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	90600000	USD
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
CY2019Q3	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	6616355	shares
CY2019Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	5250000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	19701000	USD
CY2019Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	15184000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	38139000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9934000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-18438000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-57276000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	25580000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-82856000	USD
CY2019Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	15184000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	38139000	USD
CY2018Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	9455000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	25580000	USD
CY2019Q3	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
	us-gaap	Net Income Loss NetIncomeLoss	240922000	USD
CY2019Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3750000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	95599000	USD
CY2018Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3750000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	11250000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	11250000	USD
CY2019Q3	mfa	Participating Securities Distributedand Undistributed Earnings Loss Basicand Diluted ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted	280000	USD
CY2018Q3	mfa	Participating Securities Distributedand Undistributed Earnings Loss Basicand Diluted ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted	241000	USD
	mfa	Participating Securities Distributedand Undistributed Earnings Loss Basicand Diluted ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted	808000	USD
	mfa	Participating Securities Distributedand Undistributed Earnings Loss Basicand Diluted ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted	702000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	91569000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	83141000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	265438000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	228970000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	451020000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	428713000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	450641000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	408614000	shares
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.59
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	91569000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	83141000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	265438000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	228970000	USD
CY2019Q3	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	3879000	USD
CY2018Q3	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	0	USD
	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	5085000	USD
	us-gaap	Interest On Convertible Debt Net Of Tax InterestOnConvertibleDebtNetOfTax	0	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	95448000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	83141000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	270523000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	228970000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	451020000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	428713000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	450641000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	408614000	shares
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	28920000	shares
CY2018Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	12712000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	479940000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	428713000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	463353000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	408614000	shares
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	12000000.0	shares
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.58
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3000000.0	shares
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	3900000	shares
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1288000	USD
CY2018Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1082000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4724000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3891000	USD
CY2019Q3	mfa	Employment Agreements Number Of Officers EmploymentAgreementsNumberOfOfficers	4	officer
CY2019Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	7146853000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	8713810000	USD
CY2019Q3	mfa	Loans Purchase Transaction Committed In Previous Period Closedin Subsequent Period LoansPurchaseTransactionCommittedInPreviousPeriodClosedinSubsequentPeriod	87000000.0	USD
CY2018Q3	mfa	Loans Purchase Transaction Committed In Previous Period Closedin Subsequent Period LoansPurchaseTransactionCommittedInPreviousPeriodClosedinSubsequentPeriod	34400000	USD
CY2018Q2	mfa	Residential Whole Loans Heldat Fair Value Purchase Transaction Committedin Previous Period Closedin Subsequent Period ResidentialWholeLoansHeldatFairValuePurchaseTransactionCommittedinPreviousPeriodClosedinSubsequentPeriod	1800000	USD
CY2019Q3	mfa	Residential Whole Loans Heldat Fair Value Purchase Transaction Committedin Previous Period Closedin Subsequent Period ResidentialWholeLoansHeldatFairValuePurchaseTransactionCommittedinPreviousPeriodClosedinSubsequentPeriod	70600000	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
CY2019Q3	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	633000	USD
CY2019Q3	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	1452536000	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
CY2019Q3	mfa	Other Real Estate Fair Value OtherRealEstateFairValue	193500000	USD
CY2019Q3	mfa	Loans Including Fair Value Loans Credit Impaired Loansand Other Loansat Carrying Value LoansIncludingFairValueLoansCreditImpairedLoansandOtherLoansatCarryingValue	6400000000	USD
CY2018Q4	mfa	Loans Including Fair Value Loans Credit Impaired Loansand Other Loansat Carrying Value LoansIncludingFairValueLoansCreditImpairedLoansandOtherLoansatCarryingValue	4700000000	USD
CY2019Q3	mfa	Residential Whole Loans Carrying Value ResidentialWholeLoansCarryingValue	5000000000.0	USD
CY2018Q4	mfa	Residential Whole Loans Carrying Value ResidentialWholeLoansCarryingValue	3000000000.0	USD
CY2019Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period At Acquisition At Fair Value CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue	1500000000	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

Files In Submission

Name	View Source	Status
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$MFA
MFA FINANCIAL, INC. Stock $mfa

2019 Q4 Form 10-Q Financial Statement

#000105516019000025 Filed on November 06, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MFA MFA FINANCIAL, INC. Stock $mfa

2019 Q4 Form 10-Q Financial Statement

#000105516019000025 Filed on November 06, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MFA
MFA FINANCIAL, INC. Stock $mfa