Summary of Unpaid Principal Balances of the Servicing Portfolio (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Servicing unpaid principal balance	$ 411,911,166	$ 360,023,384

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

No definition available.

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