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Description of business and summary of significant accounting policies, Real Estate Not Owned (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Real Estate Not Owned [Abstract] |  |
Real Estate Not Owned | $ 13,617 | $ 16,815
Liabilities related to real estate not owned | $ 13,617 | $ 16,815

X
- Definition The amount of liabilities related to real estate that is not owned. + References No definition available. + Details
Name: | sdhc_LiabilitiesRelatedToRealEstateNotOwned
Namespace Prefix: | sdhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of real estate not owned. + References No definition available. + Details
Name: | sdhc_RealEstateNotOwned
Namespace Prefix: | sdhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | sdhc_RealEstateNotOwnedAbstract
Namespace Prefix: | sdhc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration