XML 43 R44.htm IDEA: XBRL DOCUMENT v3.20.1

Borrowings under Repurchase Agreements Schedule of Repurchase Agreements by Maturity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Repurchase Agreements [Line Items]
Repurchase agreements	$ 1,109,342	$ 1,296,272
Debt, Weighted Average Interest Rate	1.61%	2.00%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	39 days	39 days
Maturity up to 30 days [Member]
Repurchase Agreements [Line Items]
Repurchase agreements	$ 435,235	$ 513,092
Debt, Weighted Average Interest Rate	1.74%	2.10%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	16 days	15 days
Maturity 31 to 60 days [Member]
Repurchase Agreements [Line Items]
Repurchase agreements	$ 481,648	$ 549,541
Debt, Weighted Average Interest Rate	1.78%	1.91%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	45 days	45 days
Maturity 61 to 90 days [Member]
Repurchase Agreements [Line Items]
Repurchase agreements	$ 192,459	$ 233,639
Debt, Weighted Average Interest Rate	0.90%	1.97%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	75 days	74 days
Maturity 91 to 120 days [Member]
Repurchase Agreements [Line Items]
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	0 days	0 days
Maturity 121 to 150 days [Member] [Member]
Repurchase Agreements [Line Items]
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	0 days	0 days
Maturity 151 to 180 days [Member] [Member]
Repurchase Agreements [Line Items]
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	0 days	0 days

X

- Definition

[Line Items] for Repurchase Agreements [Table]

+ References

No definition available.

+ Details

Name:	earn_RepurchaseAgreementsLineItems
Namespace Prefix:	earn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average maturity (weighted by amount of the agreement) of repurchase agreements with the counterparty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(B)(iii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_RepurchaseAgreementCounterpartyWeightedAverageMaturityOfAgreements1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(1))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(a)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=us-gaap_MaturityUpTo30DaysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=earn_Maturity31to60daysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=earn_Maturity61to90daysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=earn_Maturity91to120daysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=earn_Maturity121to150daysMemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=earn_Maturity151to180daysMemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: