XML 86 R74.htm IDEA: XBRL DOCUMENT
v3.25.3

Schedule of Financial Instruments Carried at Other Than Fair Value (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment | $ 329,164,691 |  | $ 301,747,358 |  |
Other investments and policy loans (net of allowance for credit losses of $1,534,957 and $1,536,926 for 2025 and 2024, respectively) | 83,124,030 |  | 74,855,041 |  |
Restricted assets | 31,673,039 |  | 23,806,836 |  |
Cemetery perpetual care trust investments | 9,685,678 |  | 8,836,503 |  |
Mortgage servicing rights | 2,616,372 |  | 2,939,878 |  | $ 3,461,146
Mortgage servicing rights, estimated fair value | 4,035,635 |  | 4,552,316 |  |
Bank and other loans payable | (123,096,234) |  | (106,740,104) |  |
Future policy benefits and unpaid claims | (965,878,450) |  | (944,811,843) |  |
Residential Mortgage [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment | 89,718,459 |  | 89,780,350 |  |
Other investments and policy loans, estimated fair value | 89,993,926 |  | 90,168,328 |  |
Residential Mortgage [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment |  |  |  |  |
Residential Mortgage [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment |  |  |  |  |
Residential Mortgage [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment | 89,993,926 |  | 90,168,328 |  |
Residential Construction [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment | 165,018,792 |  | 150,211,240 |  |
Other investments and policy loans, estimated fair value | 165,018,792 |  | 150,211,240 |  |
Residential Construction [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment |  |  |  |  |
Residential Construction [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment |  |  |  |  |
Residential Construction [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment | 165,018,792 |  | 150,211,240 |  |
Commercial Loan [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment | 74,427,440 |  | 61,755,768 |  |
Other investments and policy loans, estimated fair value | 75,580,341 |  | 60,864,775 |  |
Commercial Loan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment |  |  |  |  |
Commercial Loan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment |  |  |  |  |
Commercial Loan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment | 75,580,341 |  | 60,864,775 |  |
Mortgage Loans Net 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment | 329,164,691 |  | 301,747,358 |  |
Other investments and policy loans, estimated fair value | 330,593,059 |  | 301,244,343 |  |
Other investments and policy loans (net of allowance for credit losses of $1,534,957 and $1,536,926 for 2025 and 2024, respectively) | 14,372,484 |  | 14,019,248 |  |
Mortgage Loans Net 1 [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment |  |  |  |  |
Mortgage Loans Net 1 [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment |  |  |  |  |
Mortgage Loans Net 1 [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment | 330,593,059 |  | 301,244,343 |  |
Policy Loan [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans, estimated fair value | 14,372,484 |  | 14,019,248 |  |
Policy Loan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans (net of allowance for credit losses of $1,534,957 and $1,536,926 for 2025 and 2024, respectively) |  |  |  |  |
Policy Loan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans (net of allowance for credit losses of $1,534,957 and $1,536,926 for 2025 and 2024, respectively) |  |  |  |  |
Policy Loan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans (net of allowance for credit losses of $1,534,957 and $1,536,926 for 2025 and 2024, respectively) | 14,372,484 |  | 14,019,248 |  |
Insurance Assignments [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans (net of allowance for credit losses of $1,534,957 and $1,536,926 for 2025 and 2024, respectively) | 40,743,363 | [1] | 46,956,932 | [2] |
Other investments and policy loans, estimated fair value | 40,743,363 | [1] | 46,956,932 | [2] |
Insurance Assignments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans (net of allowance for credit losses of $1,534,957 and $1,536,926 for 2025 and 2024, respectively) |  | [1] |  | [2] |
Insurance Assignments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans (net of allowance for credit losses of $1,534,957 and $1,536,926 for 2025 and 2024, respectively) |  | [1] |  | [2] |
Insurance Assignments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans (net of allowance for credit losses of $1,534,957 and $1,536,926 for 2025 and 2024, respectively) | 40,743,363 | [1] | 46,956,932 | [2] |
Restricted Assets [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Restricted assets | 1,176,532 | [3] | 983,834 | [4] |
Restricted assets, estimated fair value | 1,176,532 | [3] | 983,834 | [4] |
Restricted Assets [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Restricted assets |  | [3] |  | [4] |
Restricted Assets [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Restricted assets |  | [3] |  | [4] |
Restricted Assets [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Restricted assets | 1,176,532 | [3] | 983,834 | [4] |
Cemetery Perpetual Care Trust Investments [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Cemetery perpetual care trust investments | 1,671,956 | [3] | 2,141,464 | [4] |
Cemetery perpetual care trust investments, estimated fair value | 1,671,956 | [3] | 2,141,464 | [4] |
Cemetery Perpetual Care Trust Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Cemetery perpetual care trust investments |  | [3] |  | [4] |
Cemetery Perpetual Care Trust Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Cemetery perpetual care trust investments |  | [3] |  | [4] |
Cemetery Perpetual Care Trust Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Cemetery perpetual care trust investments | 1,671,956 | [3] | 2,141,464 | [4] |
Mortgage Servicing Rights [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage servicing rights | 2,616,372 |  | 2,939,878 |  |
Mortgage servicing rights, estimated fair value | 4,035,635 |  | 4,552,316 |  |
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage servicing rights |  |  |  |  |
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage servicing rights |  |  |  |  |
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage servicing rights | 4,035,635 |  | 4,552,316 |  |
Bank And Other Loans Payable [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Bank and other loans payable | (123,096,234) |  | (106,740,104) |  |
Bank and other loans payable, estimated fair value | (110,888,695) |  | (90,455,678) |  |
Bank And Other Loans Payable [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Bank and other loans payable |  |  |  |  |
Bank And Other Loans Payable [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Bank and other loans payable |  |  |  |  |
Future policy benefits and unpaid claims |  | [5] |  | [6] |
Bank And Other Loans Payable [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Bank and other loans payable | (110,888,695) |  | (90,455,678) |  |
Policyholder Account Balances [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims | (35,957,897) | [5] | (37,066,043) | [6] |
Future policy benefits and unpaid claims, estimated fair value | (35,998,992) | [5] | (37,626,593) | [6] |
Policyholder Account Balances [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims |  | [5] |  | [6] |
Policyholder Account Balances [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims | (35,998,992) | [5] | (37,626,593) | [6] |
Future Policy Benefits Annuities [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims | (105,401,640) | [5] | (105,716,087) | [6] |
Future policy benefits and unpaid claims, estimated fair value | (104,481,604) | [5] | (104,611,544) | [6] |
Future Policy Benefits Annuities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims |  | [5] |  | [6] |
Future Policy Benefits Annuities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims |  | [5] |  | [6] |
Future Policy Benefits Annuities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims | $ (104,481,604) | [5] | $ (104,611,544) | [6] |
[1] | Included in other investments and policy loans on the condensed 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 condensed consolidated balance sheets
[6] | Included in future policy benefits and unpaid claims on the consolidated balance sheets

X
- Definition Cemetery Perpetual Care Trust Investments. + References No definition available. + Details
Name: | SNFCA_CemeteryPerpetualCareTrustInvestments
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of cemetery perpetual care trust investments. + References No definition available. + Details
Name: | SNFCA_FairValueOfCemeteryPerpetualCareTrustInvestments
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of future policy benefits and unpaid claims. + References No definition available. + Details
Name: | SNFCA_FairValueOfFuturePolicyBenefitsAndUnpaidClaims
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair Value of Policy and Other Loans Receivable. + References No definition available. + Details
Name: | SNFCA_FairValueOfPolicyAndOtherLoansReceivable
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Policy and other loans receivable net1. + References No definition available. + Details
Name: | SNFCA_PolicyAndOtherLoansReceivableNet1
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478898/942-825-50-1 + Details
Name: | us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
Name: | us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E + Details
Name: | us-gaap_LoansPayableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_LoansPayableToBank
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-9 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477220/954-210-45-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478600/954-210-50-2 + Details
Name: | us-gaap_RestrictedInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate value of all restricted investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)(Footnote 8)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)(Footnote 11)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)(Footnote 5)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477220/954-210-45-4 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478600/954-210-50-2 + Details
Name: | us-gaap_RestrictedInvestmentsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-1 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 + Details
Name: | us-gaap_ServicingAssetAtAmortizedValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 + Details
Name: | us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=SNFCA_ResidentialConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- 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: |

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

X
- 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: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=SNFCA_PolicyholderAccountBalancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=SNFCA_FuturePolicyBenefitsAnnuitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |