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Fee Income from Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest and Fee Income, Loan and Lease, Held-in-Portfolio [Abstract]
Origination and modification fees	$ 844	$ 1,234	$ 2,384	$ 3,890
Extension fees	188	239	650	624
Late and other fees	481	(105)	707	404
Processing fees	33	16	84	87
Construction servicing fees	105	183	346	432
Legal fees	81	49	215	206
Other fees	232	227	774	900
Total	$ 1,964	$ 1,843	$ 5,160	$ 6,543

X

- Definition

Amount of income from construction servicing fees.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of income from extension fees .

+ References

No definition available.

+ Details

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

X

- Definition

Amount of income from legal fees .

+ References

No definition available.

+ Details

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

X

- Definition

The amount of income from processing fees.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of income from late and other fees .

+ References

No definition available.

+ Details

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

X

- Definition

Amount of origination and modification fee of loans during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of income from other fees.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of fee income including, but not limited to, managerial assistance, servicing of investment, and origination and commitment fees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(1)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

Name:	us-gaap_FeeIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldInPortfolioAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration