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Summary of Loan Loss Reserve Included in Other Liabilities and Accrued Expenses (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loans Held For Sale |  |  |
Balance, beginning of period |  | $ 20,583,618 | $ 4,046,288
Provision on current loan originations (1) | [1] | 1,701,700 | 4,938,214
Additional provision for loan loss reserve |  |  | 16,506,030
Charge-offs, net of recaptured amounts |  | 19,877,085 | 4,906,914
Balance, end of period |  | $ 2,408,233 | $ 20,583,618
[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

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

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

X
- References No definition available. + Details
Name: | SNFCA_LoanLossReserveAddition
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the monetary amount of Loan loss reserve, Charge-offs, as of the indicated date. + References No definition available. + Details
Name: | SNFCA_LoanLossReserveChargeOffs
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the monetary amount of Loan loss reserve, Provisions for losses, as of the indicated date. + References No definition available. + Details
Name: | SNFCA_LoanLossReserveProvisionsForLosses
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant