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

Sep. 30, 2021

Dec. 31, 2020

Residential Mortgage [Member]

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

Carrying Value

$ 87,090,816

$ 92,757,613

Estimated Carrying Value

90,792,471

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

90,792,471

100,384,283

Residential Construction [Member]

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

Carrying Value

168,696,882

110,849,864

Estimated Carrying Value

168,696,882

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

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

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

Estimated Carrying Value

168,696,882

Commercial Loan [Member]

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

Carrying Value

51,602,783

45,736,459

Estimated Carrying Value

51,318,799

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

51,318,799

45,259,425

Mortgage Loans Net [Member]

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

Carrying Value

307,390,481

249,343,936

Estimated Carrying Value

310,808,152

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

310,808,152

256,493,572

Policy Loan [Member]

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

Carrying Value

13,699,414

14,171,589

Estimated Carrying Value

13,699,414

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

13,699,414

14,171,589

Insurance Assignments [Member]

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

Carrying Value

51,622,313

^[1]

51,585,656

^[2]

Estimated Carrying Value

51,622,313

^[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

51,622,313

^[1]

51,585,656

^[2]

Restricted Assets 1 [Member]

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

Carrying Value

2,848,029

^[3]

3,317,877

^[4]

Estimated Carrying Value

2,848,029

^[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

2,848,029

^[3]

3,317,877

^[4]

Cemetery Perpetual Care Trust Investments [Member]

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

Carrying Value

652,575

^[3]

1,468,600

^[4]

Estimated Carrying Value

652,575

^[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

652,575

^[3]

1,468,600

^[4]

Mortgage Servicing Rights [Member]

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

Carrying Value

50,360,805

35,210,516

Estimated Carrying Value

63,885,183

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

63,885,183

38,702,358

Bank and Other Loans Payable [Member]

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

Carrying Value

(263,186,923)

(297,824,368)

Estimated Carrying Value

(263,186,923)

(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

(263,186,923)

(297,824,368)

Policyholder Account Balances [Member]

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

Carrying Value

(43,058,156)

^[5]

(44,026,809)

^[6]

Estimated Carrying Value

(42,144,499)

^[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

(42,144,499)

^[5]

(42,220,725)

^[6]

Future Policy Benefits Annuities [Member]

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

Carrying Value

(108,252,697)

^[5]

(106,522,113)

^[6]

Estimated Carrying Value

(112,157,034)

^[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

$ (112,157,034)

^[5]

(112,354,186)

^[6]

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

$ 110,849,864

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

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

X

- Details

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

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- Details

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

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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

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- Details

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

X

- 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:
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Balance Type:
Period Type:

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- Details

Name:	us-gaap_FinancialInstrumentAxis=SNFCA_PolicyholderAccountBalancesMember
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Balance Type:
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