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Real Estate Securities Interest Income Components (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2013
Interest Income Components [Line Items]
Coupon Income		$ 12,998	$ 18,308
Amortization of premiums and accretion of discounts (net)	0	(1,782)	(2,498)
Interest Income		11,216	15,810
Non-Agency RMBS [Member]
Interest Income Components [Line Items]
Coupon Income		428	824
Amortization of premiums and accretion of discounts (net)		307	631
Interest Income		735	1,455
Agency RMBS [Member]
Interest Income Components [Line Items]
Coupon Income		12,570	17,484
Amortization of premiums and accretion of discounts (net)		(2,089)	(3,129)
Interest Income		$ 10,481	$ 14,355

X

- Definition

Represents the coupon interest income earned from securities backed by a pool of mortgages.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Income derived from investments in debt securities including coupon interest income earned from securities backed by a pool of mortgages and adjustments for amortization of premiums and accreation of discounts.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:	earn_
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X

- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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