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Summary of Loan Loss Reserve Included in Other Liabilities and Accrued Expenses (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Loans Held For Sale |  |  |  |  |  |
Balance, beginning of period |  | $ 696,626 |  | $ 547,233 | $ 547,233 |
Provision on current loan originations |  | 616,524 | [1] | $ 729,734 | 932,154 | [1]
Additional provision | [2] | 40,000 |  |  |  |
Charge-offs, net of recaptured amounts |  | (764,281) |  |  | (782,761) |
Balance, end of period |  | $ 588,869 |  |  | $ 696,626 |
[1] | Included in mortgage fee income
[2] | Included in other expenses

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- Definition Represents the monetary amount of Beginning, Loan Loss Reserve, as of the indicated date. + References No definition available. + Details
Name: | SNFCA_BeginningLoanLossReserve
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Loans Held for Sale. + References No definition available. + Details
Name: | SNFCA_EndingLoanLossReserve
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Loan loss reserve additional provisions. + References No definition available. + Details
Name: | SNFCA_LoanLossReserveAdditionalProvisions
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Loan loss reserve charge offs. + References No definition available. + Details
Name: | SNFCA_LoanLossReserveChargeOffs
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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