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Mortgages Receivable - Maturities of mortgage loans (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Mortgages Receivable |  |
2021 | $ 112,313,184 |
2022 | 33,433,297 |
2023 | 9,598,788 |
2024 | 271,031 |
Total | $ 155,616,300 | $ 94,348,689

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- Definition Maturities for the fourth year following the date of the financial statements. + References No definition available. + Details
Name: | sach_MaturitiesOfMortgageReceivableYearFour
Namespace Prefix: | sach_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maturities for the first year following the date of the financial statements. + References No definition available. + Details
Name: | sach_MaturitiesOfMortgageReceivableYearOne
Namespace Prefix: | sach_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maturities for the third year following the date of the financial statements. + References No definition available. + Details
Name: | sach_MaturitiesOfMortgageReceivableYearThree
Namespace Prefix: | sach_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maturities for the second year following the date of the financial statements. + References No definition available. + Details
Name: | sach_MaturitiesOfMortgageReceivableYearTwo
Namespace Prefix: | sach_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | srt_MortgageLoansOnRealEstateAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant