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Loans Held For Sale: Aggregate fair value - Loans Held for Sale (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Loans Held For Sale
Aggregate fair value	$ 296,728,086	$ 422,772,418
Unpaid principal balance	287,867,995	406,407,323
Unrealized gain	$ 8,860,091	$ 16,365,095

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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:	snfc_
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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

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Namespace Prefix:	snfc_
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:	snfc_
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:	snfc_UnrealizedGainLoansHeldForSale
Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant