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Summary of Unpaid Principal Balances of the Servicing Portfolio (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Servicing unpaid principal balance	$ 391,681,072	$ 414,147,436

X

- Definition

Represents the monetary amount of Servicing Unpaid Principal Balance, as of the indicated date.

+ References

No definition available.

+ Details

Name:	SNFCA_ServicingUnpaidPrincipalBalance
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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