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Schedule of Investments (Details) (Parenthethical) - USD ($)

Dec. 31, 2024

Dec. 31, 2023

Short term investment

$ 2,404,900

^[1]

$ 2,279,800

^[2]

Membership [Member]

Short term investment

553,900

530,900

Activity Stock Due [Member]

Short term investment

$ 1,851,000

$ 1,748,900

[1]	Includes $553,900 of Membership stock and $1,851,000 of Activity stock due to short-term advances and letters of credit.
[2]	Includes $530,900 of Membership stock and $1,748,900 of Activity stock due to short-term advances and letters of credit.

X

- Definition

Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477974/942-325-45-1

+ Details

Name:	us-gaap_FederalHomeLoanBankStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_MembershipMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=SNFCA_ActivityStockDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: