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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

X

- 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

X

- 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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	srt_MortgageLoansOnRealEstateAbstract
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

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