Name:	sach_EquitySecuritiesFvniGainLoss.
Namespace Prefix:	sach_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the total amount invested in three limited liability companies

No definition available.

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

Total limited liability companies managed by a commercial real estate finance company.

No definition available.

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

Represents the participation interest in two mortgage loans, each loan held by each limited liability company in return of investment.

No definition available.

Name:	sach_ParticipationInterestInTwoMortgageLoansEachLoanHeldByEachLimitedLiabilityCompany
Namespace Prefix:	sach_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Line items represents 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.

No definition available.

Name:	sach_PartnershipInvestmentsLineItems
Namespace Prefix:	sach_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of unfunded partnership commitments.

No definition available.

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

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482987/272-10-50-3

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Name:	srt_OwnershipAxis=sach_FourOfLimitedLiabilityCompaniesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_OwnershipAxis=sach_OneOfLimitedLiabilityCompaniesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: