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Loans Held for Sale (Details Narrative) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Loans Held For Sale |  |  |  |  |
Foreclosure loans unpaid principal balance | $ 332,848 |  |  | $ 1,636,090 |
Provision on current loan originations | $ 729,734 | [1] | $ 770,220 | $ 27,164 | [1]
Loan increase per point | $ 420 |  | $ 450 |  |
Amount of loan increased, per point | $ 1,000,000 |  | $ 1,000,000 |  |
[1] | Included in mortgage fee income

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- Definition Amount of loan increased per point. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | SNFCA_
Data Type: | xbrli:stringItemType
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- Definition Foreclosure loans unpaid principal balance. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Loan increase per point. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
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Balance Type: | na
Period Type: | instant

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- Definition Provision on current loan originations. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration