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2) Investments: Residential Real Estate Held for Investment (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Impairment losses on residential real estate held for investment | $ 43,394 | $ 700,134
Residential Real Estate |  |
Foreclosed Residential Real Estate included in Residential Real Estate Held for Investment | $ 4,327,079 | $ 12,433,986

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- 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

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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: |