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Summary of Unpaid Principal Balances of the Servicing Portfolio (Details) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Servicing unpaid principal balance | $ 7,381,027,999 | $ 7,060,536,350

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

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