XML 45 R33.htm IDEA: XBRL DOCUMENT v3.21.1

3) Investments: Schedule of Unrealized Loss on Investments (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
US States and Political Subdivisions Debt Securities
Available for sale Securities, Unrecognized Holding Loss	$ 24,569	$ 1,261
Available for sale Securities, Fair Value	778,979	206,812
US States and Political Subdivisions Debt Securities | Less Than 12 Months
Available for sale Securities, Unrecognized Holding Loss	24,569	1,261
Available for sale Securities, Fair Value	778,979	206,812
US States and Political Subdivisions Debt Securities | More Than 12 Months
Available for sale Securities, Unrecognized Holding Loss		0
Available for sale Securities, Fair Value	0
Corporate Securities
Available for sale Securities, Unrecognized Holding Loss	501,358	681,478
Available for sale Securities, Fair Value	18,959,998	12,512,324
Corporate Securities | Less Than 12 Months
Available for sale Securities, Unrecognized Holding Loss	137,661	242,596
Available for sale Securities, Fair Value	9,760,180	9,919,298
Corporate Securities | More Than 12 Months
Available for sale Securities, Unrecognized Holding Loss	363,697	438,882
Available for sale Securities, Fair Value	9,199,818	2,593,026
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Available for sale Securities, Unrecognized Holding Loss	236,547	267,106
Available for sale Securities, Fair Value	7,261,927	3,507,535
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Less Than 12 Months
Available for sale Securities, Unrecognized Holding Loss	90,713	266,522
Available for sale Securities, Fair Value	5,235,918	3,455,574
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | More Than 12 Months
Available for sale Securities, Unrecognized Holding Loss	145,834	584
Available for sale Securities, Fair Value	2,026,009	51,961
Total unrealized losses
Available for sale Securities, Unrecognized Holding Loss	762,474	949,845
Available for sale Securities, Fair Value	27,000,904	16,226,671
Total unrealized losses | Less Than 12 Months
Available for sale Securities, Unrecognized Holding Loss	252,943	510,379
Available for sale Securities, Fair Value	15,775,077	13,581,684
Total unrealized losses | More Than 12 Months
Available for sale Securities, Unrecognized Holding Loss	509,531	439,466
Available for sale Securities, Fair Value	$ 11,225,827	$ 2,644,987

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	snfc_AvailableForSaleSecuritiesUnrecognizedHoldingLosses
Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	snfc_TimeDurationAxis=snfc_LessThan12MonthsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	snfc_TimeDurationAxis=snfc_MoreThan12MonthsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=snfc_CorporateSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=snfc_TotalUnrealizedLossesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: