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Schedule of Financial Instruments Carried at Other Than Fair Value (Details) - USD ($)

Dec. 31, 2021

Dec. 31, 2020

Residential Mortgage [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

$ 51,396,172

$ 92,757,613

Estimated carrying value

55,159,167

100,384,283

Residential Mortgage [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Residential Mortgage [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Residential Mortgage [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

55,159,167

100,384,283

Residential Construction [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

174,691,408

110,849,864

Estimated carrying value

174,691,408

110,849,864

Residential Construction [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Residential Construction [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Fair Value, Inputs, Level 3 [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

174,691,408

110,849,864

Commercial Loan [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

51,218,466

45,736,459

Estimated carrying value

51,008,709

45,259,425

Commercial Loan [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Commercial Loan [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Commercial Loan [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

51,008,709

45,259,425

Mortgage Loans Net [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

277,306,046

249,343,936

Estimated carrying value

280,859,284

256,493,572

Mortgage Loans Net [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Mortgage Loans Net [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Mortgage Loans Net [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

280,859,284

256,493,572

Policy Loan [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

13,478,214

14,171,589

Estimated carrying value

13,478,214

14,171,589

Policy Loan [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Policy Loan [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Policy Loan [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

13,478,214

14,171,589

Insurance Assignments [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

46,946,590

^[1]

51,585,656

^[2]

Estimated carrying value

46,946,590

^[1]

51,585,656

^[2]

Insurance Assignments [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

^[1]

^[2]

Insurance Assignments [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

^[1]

^[2]

Insurance Assignments [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

46,946,590

^[1]

51,585,656

^[2]

Restricted Assets 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

2,732,320

^[3]

3,317,877

^[4]

Estimated carrying value

2,732,320

^[3]

3,317,877

^[4]

Restricted Assets 1 [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

^[3]

^[4]

Restricted Assets 1 [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

^[3]

^[4]

Restricted Assets 1 [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

2,732,320

^[3]

3,317,877

^[4]

Cemetery Perpetual Care Trust Investments [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

1,823,533

^[3]

1,468,600

^[4]

Estimated carrying value

1,823,533

^[3]

1,468,600

^[4]

Cemetery Perpetual Care Trust Investments [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

^[3]

^[4]

Cemetery Perpetual Care Trust Investments [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

^[3]

^[4]

Cemetery Perpetual Care Trust Investments [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

1,823,533

^[3]

1,468,600

^[4]

Mortgage Servicing Rights [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

53,060,455

35,210,516

Estimated carrying value

68,811,809

38,702,358

Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

68,811,809

38,702,358

Bank and Other Loans Payable [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

(251,286,927)

(297,824,368)

Estimated carrying value

(251,286,927)

(297,824,368)

Bank and Other Loans Payable [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Bank and Other Loans Payable [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

Bank and Other Loans Payable [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

(251,286,927)

(297,824,368)

Policyholder Account Balances [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

(42,939,055)

^[5]

(44,026,809)

^[6]

Estimated carrying value

(35,855,934)

^[5]

(42,220,725)

^[6]

Policyholder Account Balances [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

^[5]

^[6]

Policyholder Account Balances [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

^[5]

^[6]

Policyholder Account Balances [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

(35,855,934)

^[5]

(42,220,725)

^[6]

Future Policy Benefits Annuities [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Carrying value

(107,992,830)

^[5]

(106,522,113)

^[6]

Estimated carrying value

(116,215,717)

^[5]

(112,354,186)

^[6]

Future Policy Benefits Annuities [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

^[5]

^[6]

Future Policy Benefits Annuities [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

^[5]

^[6]

Future Policy Benefits Annuities [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]

Estimated carrying value

$ (116,215,717)

^[5]

$ (112,354,186)

^[6]

[1]	Included in other investments and policy loans on the consolidated balance sheets
[2]	Included in other investments and policy loans on the consolidated balance sheets
[3]	Mortgage loans held for investment
[4]	Mortgage loans held for investment
[5]	Included in future policy benefits and unpaid claims on the consolidated balance sheets
[6]	Included in future policy benefits and unpaid claims on the consolidated balance sheets

X

- Definition

Represents the monetary amount of Carrying Value, as of the indicated date.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the monetary amount of Estimated Carrying Value, as of the indicated date.

+ References

No definition available.

+ Details

Name:	SNFCA_EstimatedCarryingValue
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Balance Type:
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- Details

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- Details

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Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=SNFCA_MortgageLoansNet1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=SNFCA_PolicyLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_FinancialInstrumentAxis=SNFCA_InsuranceAssignmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_FinancialInstrumentAxis=SNFCA_RestrictedAssets1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_FinancialInstrumentAxis=SNFCA_CemeteryPerpetualCareTrustInvestments2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=SNFCA_MortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=SNFCA_BankAndOtherLoansPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_FinancialInstrumentAxis=SNFCA_PolicyholderAccountBalancesMember
Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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