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Summary of Loan Loss Reserve Included in Other Liabilities and Accrued Expenses (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Loans Held For Sale |  |  |  |  |  |  |
Balance, beginning of period |  |  | $ 2,447,139 |  | $ 20,583,618 | $ 20,583,618 |
Provision on current loan originations (1) | $ 230,321 | $ 432,468 | 829,243 | [1] | $ 1,701,700 | 2,211,230 | [1]
Charge-offs, net of recaptured amounts |  |  | (1,450,626) |  |  | (20,347,709) |
Balance, end of period | $ 1,825,756 |  | $ 1,825,756 |  |  | $ 2,447,139 |
[1] | Included in mortgage fee income

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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 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 Amount of expense related to estimated loss to be realized from lease transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_ProvisionForLeaseLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration