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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
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Data Type: | xbrli:stringItemType
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