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v3.25.1

Summary of Loan Loss Reserve Included in Other Liabilities and Accrued Expenses (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Loans Held For Sale |  |  |  |  |
Balance, beginning of period | $ 696,626 |  | $ 547,233 | $ 547,233 |
Provision on current loan originations | 183,034 | [1] | $ 163,476 | 932,154 | [1]
Charge-offs, net of recaptured amounts | (177,769) |  |  | (782,761) |
Balance, end of period | $ 701,891 |  |  | $ 696,626 |
[1] | Included in mortgage fee income

X
- 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

X
- 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

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

X
- 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