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Unsecured Notes Payable - Estimated amortization of the deferred financing costs (Details) - Unsecured Debt - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Unsecured Notes Payable
2025 (remaining three months)	$ 337
2026	1,410
2027	494
Total deferred costs	$ 2,241	$ 3,713

X

- Definition

The amount of estimated amortization of deferred financing costs in next fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	sach_
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Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of estimated amortization of deferred financing costs in second fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of estimated amortization of deferred financing costs in remainder of current fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	sach_
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Balance Type:	debit
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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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-1A

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

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Period Type:	instant

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- Details

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