XML 52 R38.htm IDEA: XBRL DOCUMENT v3.20.1

Derivative Instruments Schedule of Interest Rate Swaps by Maturity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative, Fair Value, Net	$ (18,502)	$ 2,133
Short [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (12,837)	$ 1,911
Weighted Average Pay Rate	1.62%	1.69%
Weighted Average Receive Rate	1.66%	1.93%
Derivative, Average Remaining Maturity	3 years 2 months 15 days	3 years 10 months 13 days
Derivative, Notional Amount	$ 391,702	$ 610,997
Short [Member] | Year 2022 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (2,213)	$ 292
Weighted Average Pay Rate	1.26%	1.54%
Weighted Average Receive Rate	1.57%	1.91%
Derivative, Average Remaining Maturity	2 years 5 months 23 days	2 years 11 months 1 day
Derivative, Notional Amount	$ 91,927	$ 74,370
Short [Member] | Year 2020 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (298)	$ 148
Weighted Average Pay Rate	1.60%	1.60%
Weighted Average Receive Rate	1.79%	1.97%
Derivative, Average Remaining Maturity	25 days	3 months 25 days
Derivative, Notional Amount	$ 86,000	$ 86,000
Short [Member] | Year 2021 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (1,978)	$ (134)
Weighted Average Pay Rate	1.91%	1.79%
Weighted Average Receive Rate	1.76%	1.92%
Derivative, Average Remaining Maturity	1 year 1 month 6 days	1 year 6 months 18 days
Derivative, Notional Amount	$ 104,016	$ 161,581
Short [Member] | Year 2023 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (2,199)	$ (1,223)
Weighted Average Pay Rate	1.95%	1.97%
Weighted Average Receive Rate	1.67%	1.91%
Derivative, Average Remaining Maturity	3 years 3 months 21 days	3 years 7 months 9 days
Derivative, Notional Amount	$ 44,408	$ 84,373
Short [Member] | Year 2024 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net		$ 246
Weighted Average Pay Rate		1.46%
Weighted Average Receive Rate		2.04%
Derivative, Average Remaining Maturity		4 years 9 months 3 days
Derivative, Notional Amount		$ 19,073
Short [Member] | Year 2025 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net		$ 1,129
Weighted Average Pay Rate		1.56%
Weighted Average Receive Rate		1.92%
Derivative, Average Remaining Maturity		5 years 10 months 28 days
Derivative, Notional Amount		$ 106,812
Short [Member] | Year 2026 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (1,947)	$ 402
Weighted Average Pay Rate	1.57%	1.57%
Weighted Average Receive Rate	1.61%	1.91%
Derivative, Average Remaining Maturity	6 years 8 months 1 day	6 years 11 months 1 day
Derivative, Notional Amount	$ 28,502	$ 28,502
Short [Member] | Year 2027 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (329)	$ 547
Weighted Average Pay Rate	1.61%	1.61%
Weighted Average Receive Rate	1.64%	1.92%
Derivative, Average Remaining Maturity	7 years 7 months 28 days	7 years 10 months 28 days
Derivative, Notional Amount	$ 4,228	$ 35,550
Short [Member] | Year 2029 [Member] [Domain] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net		$ 2
Weighted Average Pay Rate		1.72%
Weighted Average Receive Rate		1.90%
Derivative, Average Remaining Maturity		9 years 10 months 20 days
Derivative, Notional Amount		$ 170
Short [Member] | Year 2030 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (386)
Weighted Average Pay Rate	0.93%
Weighted Average Receive Rate	1.00%
Derivative, Average Remaining Maturity	9 years 11 months 12 days
Derivative, Notional Amount	$ 18,055
Short [Member] | Year 2042 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (2,099)	$ 501
Weighted Average Pay Rate	1.81%	1.81%
Weighted Average Receive Rate	1.61%	1.91%
Derivative, Average Remaining Maturity	22 years 8 months 4 days	22 years 11 months 4 days
Derivative, Notional Amount	$ 10,303	$ 10,303
Short [Member] | Year 2048 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (387)	$ (157)
Weighted Average Pay Rate	3.18%	3.18%
Weighted Average Receive Rate	1.64%	1.92%
Derivative, Average Remaining Maturity	28 years 8 months 4 days	28 years 11 months 4 days
Derivative, Notional Amount	$ 630	$ 630
Short [Member] | Year 2049 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (1,001)	$ 158
Weighted Average Pay Rate	1.89%	1.89%
Weighted Average Receive Rate	1.80%	1.94%
Derivative, Average Remaining Maturity	29 years 7 months 2 days	29 years 10 months 2 days
Derivative, Notional Amount	$ 3,633	$ 3,633
Long [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ 504	$ 66
Weighted Average Pay Rate	1.47%	1.93%
Weighted Average Receive Rate	0.76%	1.87%
Derivative, Average Remaining Maturity	5 years 7 days	6 years 2 months 1 day
Derivative, Notional Amount	$ 81,362	$ 23,102
Long [Member] | Year 2022 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ 4
Weighted Average Pay Rate	1.37%
Weighted Average Receive Rate	0.49%
Derivative, Average Remaining Maturity	2 years
Derivative, Notional Amount	$ 9,200
Long [Member] | Year 2023 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ 565	$ 81
Weighted Average Pay Rate	1.60%	1.94%
Weighted Average Receive Rate	1.08%	1.87%
Derivative, Average Remaining Maturity	3 years 10 days	3 years 3 months 25 days
Derivative, Notional Amount	$ 30,150	$ 13,200
Long [Member] | Year 2025 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ 40
Weighted Average Pay Rate	1.35%
Weighted Average Receive Rate	0.55%
Derivative, Average Remaining Maturity	5 years
Derivative, Notional Amount	$ 24,260
Long [Member] | Year 2029 [Member] [Domain] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net		$ (15)
Weighted Average Pay Rate		1.92%
Weighted Average Receive Rate		1.87%
Derivative, Average Remaining Maturity		9 years 11 months 23 days
Derivative, Notional Amount		$ 9,902
Long [Member] | Year 2030 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ (105)
Weighted Average Pay Rate	1.44%
Weighted Average Receive Rate	0.66%
Derivative, Average Remaining Maturity	10 years 3 days
Derivative, Notional Amount	$ 17,752

X

- Definition

Weighted average pay rate on interest rate swaps.

+ References

No definition available.

+ Details

Name:	earn_WeightedAveragePayRate
Namespace Prefix:	earn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average receive rate on interest rate swaps.

+ References

No definition available.

+ Details

Name:	earn_WeightedAverageReceiveRate
Namespace Prefix:	earn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageRemainingMaturity1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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.

+ Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2029MemberDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2042Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2048MemberDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	earn_RemainingMaturityAxis=earn_Year2049Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: