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Residential Mortgage Securities and MSR-Related Assets (Interest Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Agency MBS
Debt Securities, Available-for-sale [Line Items]
Coupon interest	$ 13,636	$ 24,628
Effective yield adjustment	(4,775)	(6,187)
Interest income	8,861	18,441
Legacy Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Coupon interest	17,282	24,272
Effective yield adjustment	9,406	13,144
Interest income	26,688	37,416
RPL/NPL MBS
Debt Securities, Available-for-sale [Line Items]
Coupon interest	5,583	16,443
Effective yield adjustment	280	142
Interest income	5,863	16,585
Accretion Income	277	148
CRT securities
Debt Securities, Available-for-sale [Line Items]
Coupon interest	3,485	6,118
Effective yield adjustment	(523)	82
Interest income	2,962	6,200
MSR-related assets
Debt Securities, Available-for-sale [Line Items]
Coupon interest	14,207	10,619
Effective yield adjustment	0	1
Interest income	$ 14,207	$ 10,620

X

- Definition

Accretion Income

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the coupon interest income derived from securities backed by a pool of mortgages or trust deeds.

+ References

No definition available.

+ Details

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Namespace Prefix:	mfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the following effective yield adjustments pertaining to mortgage backed securities. (1) For Agency MBS, this reflects net premium amortization and discount accretion based on actual prepayment activity. (2) For Non-Agency MBS, this is the difference between the net income calculated using the net yield, which is based on management's estimates of future cash flows, less the current coupon yield.

+ References

No definition available.

+ Details

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Namespace Prefix:	mfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of operating interest income, including amortization and accretion of premiums and discounts, on securitized, pass-through debt securities collateralized by real estate mortgage loans.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.2)
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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- Details

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