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10) Reinsurance, Commitments and Contingencies: Other Contingencies and Commitments (Details)	Dec. 31, 2020 USD ($)
Text Block [Abstract]
Commitments to fund new residential construction loans	$ 185,751,000
Commitments to fund new residential construction loans funded	$ 115,898,000

X

- Definition

Represents the monetary amount of Commitments to fund new residential construction loans, as of the indicated date.

+ References

No definition available.

+ Details

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Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the monetary amount of Commitments to fund new residential construction loans funded, as of the indicated date.

+ References

No definition available.

+ Details

Name:	snfc_CommitmentsToFundNewResidentialConstructionLoansFunded
Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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