Summary of Aggregate Fair Value - Loans Held for Sale (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Loans Held For Sale
Aggregate fair value	$ 209,860,409	$ 302,776,827
Unpaid principal balance	207,409,731	294,481,503
Unrealized gain	$ 2,450,678	$ 8,295,324

Represents the monetary amount of Aggregate unpaid principal balance - Loans Held for Sale, as of the indicated date.

No definition available.

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