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Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2025 USD ($) property	Dec. 31, 2024 USD ($) property
Commitments and Contingencies
Number of mortgage properties | property	1	2
Mortgages receivable	$ 0.3	$ 1.9
Unfunded Commitments
Commitments and Contingencies
Future funding obligations, Loans held for investment	47.3
Future funding obligations, Investment in limited liability companies	$ 2.4

X

- Definition

The amount of mortgage receivable for the such properties of an entity during the period.

+ References

No definition available.

+ Details

Name:	sach_AmountOfMortgageReceivable
Namespace Prefix:	sach_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the number of mortgage properties.

+ References

No definition available.

+ Details

Name:	sach_NumberOfMortgageProperties
Namespace Prefix:	sach_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of liability relating to the entity's future funding obligations on investments in limited liability companies as of the reporting date.

+ References

No definition available.

+ Details

Name:	sach_OtherCommitmentsFutureFundingObligationsInvestmentInLimitedLiabilityCompanies
Namespace Prefix:	sach_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of liability relating to the entity's future funding obligations on loans held for investment as of the reporting date.

+ References

No definition available.

+ Details

Name:	sach_OtherCommitmentsFutureFundingObligationsLoansHeldForInvestment
Namespace Prefix:	sach_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: