XML 45 R31.htm IDEA: XBRL DOCUMENT v3.25.2

Investment in Securities (Summary of Investment in Securities) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Securities, Available-for-sale [Line Items]
Investment Owned, Face Amount	$ 618,220	$ 598,454	$ 783,043
Unamortized Discount (Premium), Net	(25,508)	(28,808)	(15,587)
Debt Securities, Available-for-Sale, Amortized Cost	774,401	674,985	785,710
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	6,338	4,287	13,202
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(26,498)	(17,935)	(25,364)
Investment Owned At Fair Value, Net	$ 754,241	$ 661,337	$ 773,548
Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate	5.86%	5.70%	4.49%
Weighted Average Yield	8.55%	6.50%	4.92%
Investment, estimated remaining life	7 years 1 month 20 days	7 years 3 months 3 days	6 years 3 months 25 days
Long
Securities, Available-for-sale [Line Items]
Investment Owned, Face Amount		$ 622,057
Unamortized Discount (Premium), Net		(29,449)
Debt Securities, Available-for-Sale, Amortized Cost		697,947
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		3,903
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(17,935)
Investment Owned At Fair Value, Net		$ 683,915
Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate		5.76%
Weighted Average Yield		7.29%
Investment, estimated remaining life		7 years 2 months 1 day
Short
Securities, Available-for-sale [Line Items]
Unamortized Discount (Premium), Net		$ 641
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		384
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		0
Security Sold Short, Principal Amount		(23,603)
Financial Instruments Sold, Not Yet Purchased, Amortized Cost		(22,962)
U.S. Treasury securities sold short, at fair value		$ (22,578)
Short | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate		4.02%
Weighted Average Yield		4.32%
Investment, estimated remaining life		9 years 10 months 9 days
15-year fixed rate mortgages [Member] | Long
Securities, Available-for-sale [Line Items]
Current Principal			$ 28,647
Unamortized Discount (Premium), Net			118
Debt Securities, Available-for-Sale, Amortized Cost			28,765
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax			32
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax			(950)
Debt Securities, Available-for-Sale			$ 27,847
15-year fixed rate mortgages [Member] | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate			3.46%
Weighted Average Yield			3.20%
Investment, estimated remaining life			2 years 10 months 24 days
20-year fixed rate mortgages [Member] | Long
Securities, Available-for-sale [Line Items]
Current Principal			$ 8,524
Unamortized Discount (Premium), Net			509
Debt Securities, Available-for-Sale, Amortized Cost			9,033
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax			4
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax			(1,174)
Debt Securities, Available-for-Sale			$ 7,863
20-year fixed rate mortgages [Member] | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate			3.30%
Weighted Average Yield			2.21%
Investment, estimated remaining life			5 years 8 months 4 days
30-year fixed rate mortgages [Member]
Securities, Available-for-sale [Line Items]
Current Principal	$ 519,109
Unamortized Discount (Premium), Net	(16,601)
Debt Securities, Available-for-Sale, Amortized Cost	502,508
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	5,027
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(3,643)
Debt Securities, Available-for-Sale	$ 503,892
30-year fixed rate mortgages [Member] | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate	4.90%
Weighted Average Yield	5.34%
Investment, estimated remaining life	6 years 8 months 15 days
30-year fixed rate mortgages [Member] | Long
Securities, Available-for-sale [Line Items]
Current Principal		$ 536,948	$ 697,510
Unamortized Discount (Premium), Net		(17,320)	(15,131)
Debt Securities, Available-for-Sale, Amortized Cost		519,628	682,379
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		1,696	8,180
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(9,017)	(20,265)
Debt Securities, Available-for-Sale		$ 512,307	$ 670,294
30-year fixed rate mortgages [Member] | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate		4.86%	4.26%
Weighted Average Yield		5.26%	4.42%
Investment, estimated remaining life		7 years 3 months 3 days	6 years 6 months 3 days
Adjustable Rate Mortgages | Long
Securities, Available-for-sale [Line Items]
Current Principal			$ 7,127
Unamortized Discount (Premium), Net			933
Debt Securities, Available-for-Sale, Amortized Cost			8,060
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax			0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax			(941)
Debt Securities, Available-for-Sale			$ 7,119
Adjustable Rate Mortgages | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate			4.68%
Weighted Average Yield			2.74%
Investment, estimated remaining life			4 years 5 months 12 days
Interest-Only [Member]
Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	$ 2
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-Sale	$ 2
Interest-Only [Member] | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate	1.21%
Weighted Average Yield	11.51%
Investment, estimated remaining life	2 years 9 months 25 days
Interest-Only [Member] | Long
Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost		$ 2	$ 6,607
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		0	971
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		0	(163)
Debt Securities, Available-for-Sale		$ 2	$ 7,415
Interest-Only [Member] | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate		1.20%	2.77%
Weighted Average Yield		11.27%	15.64%
Investment, estimated remaining life		2 years 9 months 3 days	6 years 1 month 6 days
Reverse mortgages [Member] | Long
Securities, Available-for-sale [Line Items]
Current Principal			$ 14,406
Unamortized Discount (Premium), Net			2,183
Debt Securities, Available-for-Sale, Amortized Cost			16,589
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax			0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax			(1,715)
Debt Securities, Available-for-Sale			$ 14,874
Reverse mortgages [Member] | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate			5.92%
Weighted Average Yield			2.94%
Investment, estimated remaining life			4 years 6 months
Non-Agency Principal and interest securities | Long
Securities, Available-for-sale [Line Items]
Current Principal			$ 9,953
Unamortized Discount (Premium), Net			(1,764)
Debt Securities, Available-for-Sale, Amortized Cost			8,189
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax			1,231
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax			(11)
Debt Securities, Available-for-Sale			$ 9,409
Non-Agency Principal and interest securities | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate			9.39%
Weighted Average Yield			10.72%
Investment, estimated remaining life			5 years 9 months 18 days
Non-Agency Interest only securities | Long
Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost			$ 8,700
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax			2,610
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax			0
Debt Securities, Available-for-Sale			$ 11,310
Non-Agency Interest only securities | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate			0.22%
Weighted Average Yield			16.69%
Investment, estimated remaining life			9 years 10 days
CLO Notes
Securities, Available-for-sale [Line Items]
Current Principal	$ 97,297
Unamortized Discount (Premium), Net	(7,490)
Debt Securities, Available-for-Sale, Amortized Cost	89,807
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	397
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(4,756)
Debt Securities, Available-for-Sale	$ 85,448
CLO Notes | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate	11.09%
Weighted Average Yield	16.95%
Investment, estimated remaining life	3 years 7 months 24 days
CLO Notes | Long
Securities, Available-for-sale [Line Items]
Current Principal		$ 83,322	$ 16,876
Unamortized Discount (Premium), Net		(10,740)	(2,435)
Debt Securities, Available-for-Sale, Amortized Cost		72,582	14,441
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		1,382	123
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(1,972)	(73)
Debt Securities, Available-for-Sale		$ 71,992	$ 14,491
CLO Notes | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate		11.69%	12.16%
Weighted Average Yield		15.05%	15.26%
Investment, estimated remaining life		2 years 10 months 20 days	5 years 7 months 28 days
CLO Equity
Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	$ 181,611
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	877
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(18,079)
Debt Securities, Available-for-Sale	$ 164,409
CLO Equity | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Weighted Average Yield	13.32%
Investment, estimated remaining life	10 years 3 months 7 days
CLO Equity | Long
Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost		$ 105,262	$ 2,947
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		795	51
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(6,927)	(72)
Debt Securities, Available-for-Sale		$ 99,130	$ 2,926
CLO Equity | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Weighted Average Yield		12.12%	35.84%
Investment, estimated remaining life		9 years 10 months 9 days	5 years 10 months 13 days
U.S. Treasury Securities | Short
Securities, Available-for-sale [Line Items]
Unamortized Discount (Premium), Net		$ 641
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		384
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		0
Security Sold Short, Principal Amount		(23,603)
Financial Instruments Sold, Not Yet Purchased, Amortized Cost		(22,962)
U.S. Treasury securities sold short, at fair value		$ (22,578)
U.S. Treasury Securities | Short | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate		4.02%
Weighted Average Yield		4.32%
Investment, estimated remaining life		9 years 10 months 9 days
Equity Securities
Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	$ 76
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(20)
Debt Securities, Available-for-Sale	56
Equity Securities | Long
Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost		$ 75
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(19)
Debt Securities, Available-for-Sale		56
Corporate Debt Securities
Securities, Available-for-sale [Line Items]
Current Principal	1,814
Unamortized Discount (Premium), Net	(1,417)
Debt Securities, Available-for-Sale, Amortized Cost	397
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	37
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-Sale	$ 434
Corporate Debt Securities | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate	0.00%
Weighted Average Yield	0.00%
Investment, estimated remaining life	1 year 1 month 13 days
Corporate Debt Securities | Long
Securities, Available-for-sale [Line Items]
Current Principal		1,787
Unamortized Discount (Premium), Net		(1,389)
Debt Securities, Available-for-Sale, Amortized Cost		398
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		30
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		0
Debt Securities, Available-for-Sale		$ 428
Corporate Debt Securities | Long | Weighted Average [Member]
Securities, Available-for-sale [Line Items]
Investment Interest Rate		0.00%
Weighted Average Yield		0.00%
Investment, estimated remaining life		1 year 3 months 25 days
Interest-Only [Member] | Agency RMBS [Member] | Long
Securities, Available-for-sale [Line Items]
Investment Interest Rate	1.21%	1.20%	2.77%
Interest-Only [Member] | Non-Agency RMBS | Long
Securities, Available-for-sale [Line Items]
Investment Interest Rate			0.22%
Agency RMBS: | Interest-Only [Member] | Long
Securities, Available-for-sale [Line Items]
Notional Amount of Nonderivative Instruments	$ 28	$ 29	$ 83,800
Non-Agency Principal and interest securities | Non-Agency RMBS | Long
Securities, Available-for-sale [Line Items]
Investment Interest Rate			9.39%
Non-Agency RMBS | Interest-Only [Member] | Long
Securities, Available-for-sale [Line Items]
Notional Amount of Nonderivative Instruments			$ 1,050,000

X

- Definition

Financial Instruments Sold, Not yet Purchased, Amortized Cost

+ References

No definition available.

+ Details

Name:	earn_FinancialInstrumentsSoldNotYetPurchasedAmortizedCost
Namespace Prefix:	earn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Investment, Estimated Remaining Life

+ References

No definition available.

+ Details

Name:	earn_InvestmentEstimatedRemainingLife
Namespace Prefix:	earn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The net fair value of an entity's securities position as of the reporting date.

+ References

No definition available.

+ Details

Name:	earn_InvestmentOwnedAtFairValueNet
Namespace Prefix:	earn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Weighted Average Yield, Percent

+ References

No definition available.

+ Details

Name:	earn_WeightedAverageYieldPercent
Namespace Prefix:	earn_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

+ Details

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

X

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

+ Details

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

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

+ Details

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

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 103
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-103

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481830/320-10-45-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

+ Details

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

X

- Definition

Amount, after accumulated amortization, of debt discount (premium).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-1A

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

+ Details

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

X

- Definition

Fair value of obligations incurred from short sales.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 940
-SubTopic 320
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479035/940-320-45-2

+ Details

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

X

- Definition

Rate of interest on investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 55
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477439/946-210-55-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-12A(Column A)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-12A(Column A)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12(Column A)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column A)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12(Column A)(Footnote 4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column A)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column A)(Footnote 4)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column A)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

+ Details

Name:	us-gaap_InvestmentInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of principal of investment owned.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 55
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477439/946-210-55-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12(Column B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

+ Details

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

X

- Definition

Nominal or face amount on the investment owned.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 10
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480679/815-10-10-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 20
-Section 10
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480769/815-20-10-1

+ Details

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

X

- Definition

For investments which are quantified by principal amount, principal balance held at close of period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-12A(Column B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2

+ Details

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

X

- Definition

Nominal or face amount used to calculate payments on a nonderivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_NotionalAmountOfNonderivativeInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

+ Details

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

X

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
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:

X

- Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=earn_A15yearfixedratemortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=earn_A20yearfixedratemortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=earn_A30yearfixedratemortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AdjustableRateResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_InterestOnlyStripMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=earn_ReversemortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=earn_NonAgencyPrincipalAndInterestSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=earn_NonAgencyInterestOnlySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=earn_CLONotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=earn_CLOEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_InterestOnlyStripMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_AgencySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=earn_NonAgencyPrincipalAndInterestSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: