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4) Loans Held For Sale: Schedule of Mortgage Fee Income for Loans Held for Sale (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Mortgage fee income	$ 72,998,612	$ 40,281,761
Loans Held For Sale
Loan fees	9,539,956	8,916,153
Interest Income	2,311,802	1,680,459
Secondary gains	68,438,933	26,641,492
Change in fair value of loan commitments	314,466	3,275,032
Change in fair value of loans held for sale	(6,945,882)	381,734
Provision for loan loss reserve	(660,663)	(613,109)
Mortgage fee income	$ 72,998,612	$ 40,281,761

X

- Definition

Represents the monetary amount of Change in fair value of loan commitments, during the indicated time period.

+ References

No definition available.

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- Definition

Represents the monetary amount of Change in fair value of loans held for sale, during the indicated time period.

+ References

No definition available.

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- Definition

Represents the monetary amount of Loan fees, during the indicated time period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Represents the monetary amount of Mortgage Fee Income, during the indicated time period.

+ References

No definition available.

+ Details

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Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
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- Definition

Represents the monetary amount of Secondary gains, during the indicated time period.

+ References

No definition available.

+ Details

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- Definition

The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

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No definition available.

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Balance Type:	credit
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X

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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