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10) Reinsurance, Commitments and Contingencies Reinsurance (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Disclosure Text Block [Abstract]
Insurance assumed from other companies	$ 96,000,000	$ 99,000,000

X

- Definition

Represents the monetary amount of Insurance assumed from other companies, as of the indicated date.

+ References

No definition available.

+ Details

Name:	snfc_InsuranceAssumedFromOtherCompanies
Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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