Quarterly report pursuant to Section 13 or 15(d)

Cover
- Document and Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Mortgages Receivable - Additional information (Details)

v3.20.2

Mortgages Receivable - Additional information (Details)	9 Months Ended
Mortgages Receivable - Additional information (Details)	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) loan	Dec. 31, 2019 USD ($)
Mortgage Loans on Real Estate, Default Interest Rate	18.00%
Payments to Acquire Mortgage Receivable	$ 68,029,798	$ 42,163,704
Proceeds from Collection of Mortgages Receivable	37,859,270	27,917,331
Mortgages receivable	$ 124,131,879			$ 94,348,689
Mortgage loan portfolio number of loans \| loan	480
Mortgage loan portfolio number of loans in process of foreclosure \| loan	14
Number of COVID-19 forbearance requests \| loan	18		23
Mortgages receivable for COVID-19 forbearance requests	$ 5,100,000		$ 6,500,000
Deferred interest	$ 146,000		$ 200,000
Modification of borrower's loan period	90 days
Mortgage Concentration Risk [Member]
Concentration Risk, Percentage	10.00%
Mortgages [Member]
Payments to Acquire Mortgage Receivable	$ 68,029,798	$ 42,163,704
Minimum [Member]
Debt term (in years)	1 year
Interest rate (as a percent)	5.00%
Maximum [Member]
Debt term (in years)	3 years
Mortgage Loans on Real Estate, Face Amount of Mortgages	$ 3,200,000
Interest rate (as a percent)	13.00%
Fourteen Mortgage Loans [Member]
Mortgages receivable	$ 4,000,000.0

- Definition

Deferred interest for COVID-19 forbearance requests.

+ References

No definition available.

+ Details

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

- Definition

Mortgage loan receivables on COVID-19 forbearance requests.

+ References

No definition available.

+ Details

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

- Definition

Mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

+ References

No definition available.

+ Details

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Namespace Prefix:	sach_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The default interest rate on the mortgage loan receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	sach_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of mortgage receivable for COVID-19 forbearance requests.

+ References

No definition available.

+ Details

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

- Definition

Represents the modification of borrower's loan period.

+ References

No definition available.

+ Details

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Namespace Prefix:	sach_
Data Type:	xbrli:durationItemType
Balance Type:	na
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- Definition

The cash outflow to acquire a mortgage receivable for a definite sum of money at a future date.

+ References

No definition available.

+ Details

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

- Definition

The cash inflow associated with principal collections from a mortgages receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	sach_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column F
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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Balance Type:	debit
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- Definition

Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column B
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column B))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 3
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 3))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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Balance Type:	na
Period Type:	duration

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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