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3) Investments: Residential Real Estate Held for Investment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Impairment losses on residential real estate held for investment	$ 0	$ 125,980	$ 43,394	$ 125,980
Residential Real Estate
Foreclosed Residential Real Estate included in Residential Real Estate Held for Investment	$ 6,256,000		$ 6,256,000		$ 12,434,000

X

- Definition

Represents the monetary amount of Foreclosed Residential Real Estate included in Residential Real Estate Held for Investment, as of the indicated date.

+ References

No definition available.

+ Details

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

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- Definition

Represents the monetary amount of Impairment losses on residential real estate held for investment, during the indicated time period.

+ References

No definition available.

+ Details

Name:	snfc_ImpairmentLossesOnResidentialRealEstateHeldForInvestment
Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_InvestmentTypeAxis=snfc_ResidentialRealEstate1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: