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Organization and Basis of Presentation - Allowance For Credit Loss (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | $ 0 |
Impact of adoption ASC 326 | 13,644 |
Provision for credit losses | 97 |
Ending balance | 13,644 |
Mortgage Backed Securities |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 0 |
Impact of adoption ASC 326 | 13,644 |
Provision for credit losses | 0 |
Ending balance | $ 13,644 |
Cumulative Effect, Period Of Adoption, Adjustment | Mortgage Backed Securities |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Impact of adoption ASC 326 |  | $ 13,644

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- Definition Marketable Securities, Allowance For Credit Loss + References No definition available. + Details
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Namespace Prefix: | ess_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
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Period Type: | duration

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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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Balance Type: | debit
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |