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11) Reinsurance, Commitments and Contingencies: Other Contingencies and Commitments (Details) | Jun. 30, 2020 USD ($)
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Text Block [Abstract] |
Commitments to fund new residential construction loans | $ 161,213,000
Commitments to fund new residential construction loans funded | $ 108,801,000

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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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