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3) Investments: Residential Real Estate Held for Investment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Impairment losses on residential real estate held for investment	$ 0	$ 0
Residential Real Estate
Foreclosed Residential Real Estate included in Residential Real Estate Held for Investment	$ 1,657,285		$ 4,327,079

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

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

X

- 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: