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Schedule of Aggregate Fair Value Loans Held for Sale (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Loans Held For Sale
Aggregate fair value	$ 159,460,525	$ 131,181,148
Unpaid principal balance	156,916,889	128,948,072
Unrealized gain	$ 2,543,636	$ 2,233,076

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- Definition

Represents the monetary amount of Aggregate Fair Value - Loans Held For Sale, as of the indicated date.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
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Balance Type:	debit
Period Type:	instant

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- Definition

Represents the monetary amount of Aggregate unpaid principal balance - Loans Held for Sale, as of the indicated date.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents the monetary amount of Unrealized gain - Loans Held for Sale, as of the indicated date.

+ References

No definition available.

+ Details

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