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

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- 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

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- References No definition available. + Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration