Summary of Unpaid Principal Balances of the Servicing Portfolio (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Servicing unpaid principal balance	$ 7,502,116,963	$ 7,060,536,350

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