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12) Mortgage Servicing Rights: Schedule of Other Revenues (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income	$ 3,468,522	$ 1,882,752
Contractual Servicing Fees
Other Income	3,387,472	1,784,944
Late Fees
Other Income	$ 81,050	$ 97,808

X

- Definition

Amount of revenue and income classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.4)
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Details

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