XML 50 R37.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Derivative Instruments Schedule of Interest Rate Swaps by Maturity (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |
Derivative, Fair Value, Net | $ (16,649) | $ (2,542)
Short [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | 525,253 | 553,843
Derivative, Fair Value, Net | $ (17,118) | $ (3,470)
Weighted Average Pay Rate | 1.59% | 1.63%
Weighted Average Receive Rate | 0.62% | 0.36%
Derivative, Average Remaining Maturity | 5 years 58 days | 5 years 245 days
Short [Member] | Year 2016 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 48,000 | $ 48,000
Derivative, Fair Value, Net | $ (79) | $ (83)
Weighted Average Pay Rate | 0.80% | 0.80%
Weighted Average Receive Rate | 0.62% | 0.39%
Derivative, Average Remaining Maturity | 190 days | 281 days
Short [Member] | Year 2017 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 74,750 | $ 74,750
Derivative, Fair Value, Net | $ (546) | $ (445)
Weighted Average Pay Rate | 1.21% | 1.21%
Weighted Average Receive Rate | 0.63% | 0.41%
Derivative, Average Remaining Maturity | 1 year 124 days | 1 year 215 days
Short [Member] | Year 2018 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 71,529 | $ 71,529
Derivative, Fair Value, Net | $ (559) | $ 80
Weighted Average Pay Rate | 1.11% | 1.11%
Weighted Average Receive Rate | 0.62% | 0.34%
Derivative, Average Remaining Maturity | 2 years 11 days | 2 years 102 days
Short [Member] | Year 2020 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 107,461 | $ 119,893
Derivative, Fair Value, Net | $ (2,371) | $ 220
Weighted Average Pay Rate | 1.50% | 1.51%
Weighted Average Receive Rate | 0.62% | 0.33%
Derivative, Average Remaining Maturity | 4 years 29 days | 4 years 131 days
Short [Member] | Year 2021 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 10,400 |
Derivative, Fair Value, Net | $ 1 |
Weighted Average Pay Rate | 1.15% |
Weighted Average Receive Rate | 0.62% |
Derivative, Average Remaining Maturity | 4 years 318 days |
Short [Member] | Year 2022 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 19,444 | $ 19,444
Derivative, Fair Value, Net | $ (587) | $ 86
Weighted Average Pay Rate | 1.76% | 1.76%
Weighted Average Receive Rate | 0.62% | 0.34%
Derivative, Average Remaining Maturity | 6 years 95 days | 6 years 186 days
Short [Member] | Year 2023 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 131,400 | $ 131,400
Derivative, Fair Value, Net | $ (7,080) | $ (1,367)
Weighted Average Pay Rate | 2.10% | 2.10%
Weighted Average Receive Rate | 0.63% | 0.38%
Derivative, Average Remaining Maturity | 7 years 51 days | 7 years 142 days
Short [Member] | Year 2024 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 9,200 | $ 9,200
Derivative, Fair Value, Net | $ (428) | $ 11
Weighted Average Pay Rate | 1.99% | 1.99%
Weighted Average Receive Rate | 0.61% | 0.32%
Derivative, Average Remaining Maturity | 8 years 4 days | 8 years 95 days
Short [Member] | Year 2025 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 34,022 | $ 58,560
Derivative, Fair Value, Net | $ (1,503) | $ (5)
Weighted Average Pay Rate | 2.05% | 2.06%
Weighted Average Receive Rate | 0.62% | 0.33%
Derivative, Average Remaining Maturity | 8 years 314 days | 9 years 117 days
Short [Member] | Year 2043 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 19,047 | $ 21,067
Derivative, Fair Value, Net | $ (3,966) | $ (1,967)
Weighted Average Pay Rate | 3.02% | 3.03%
Weighted Average Receive Rate | 0.62% | 0.36%
Derivative, Average Remaining Maturity | 27 years 51 days | 27 years 142 days
Long [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 12,700 | $ 9,700
Derivative, Fair Value, Net | $ 1,265 | $ 857
Weighted Average Pay Rate | 0.62% | 0.32%
Weighted Average Receive Rate | 2.69% | 3.00%
Derivative, Average Remaining Maturity | 9 years 168 days | 9 years 201 days
Long [Member] | Year 2025 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 9,700 | $ 9,700
Derivative, Fair Value, Net | $ 1,255 | $ 857
Weighted Average Pay Rate | 0.62% | 0.32%
Weighted Average Receive Rate | 3.00% | 3.00%
Derivative, Average Remaining Maturity | 9 years 110 days | 9 years 201 days
Long [Member] | Year 2026 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 3,000 |
Derivative, Fair Value, Net | $ 10 |
Weighted Average Pay Rate | 0.63% |
Weighted Average Receive Rate | 1.68% |
Derivative, Average Remaining Maturity | 10 years 4 days |

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 Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 + 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
- Details
Name: | us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | earn_RemainingMaturityAxis=earn_Year2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | earn_RemainingMaturityAxis=earn_Year2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | earn_RemainingMaturityAxis=earn_Year2018Member
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_Year2022Member
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_Year2043Member
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: | earn_RemainingMaturityAxis=earn_Year2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |