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Schedule of Changes in the Consolidated Balance Sheet Line Items Measured Using Level 3 Inputs (Details) - USD ($)

3 Months Ended

Mar. 31, 2022

Mar. 31, 2021

Subsidiary, Sale of Stock [Line Items]

Net Loan Commitments, Beginning

^[1]

$ 8,563,410

Loans Held for Sale, Beginning

302,776,827

Fixed Maturity Securities Available for Sale, Beginning

259,287,603

Net Loan Commitments, Ending

^[2]

11,282,703

Loans Held for Sale, Ending

234,012,872

Fixed Maturity Securities Available for Sale, Ending

272,213,552

Net Derivatives Loan Commitments [Member]

Subsidiary, Sale of Stock [Line Items]

Net Loan Commitments, Beginning

7,015,515

$ 10,128,610

Originations and purchases

Sales, maturities and paydowns

Transfer to mortgage loans held for investment

Total gains (losses) included in earnings

2,675,371

^[3]

314,466

^[4]

Total gains (losses) included in other comprehensive income

Net Loan Commitments, Ending

9,690,886

10,443,076

Loans Held For Sale [Member]

Subsidiary, Sale of Stock [Line Items]

Loans Held for Sale, Beginning

302,776,827

422,772,418

Originations and purchases

1,039,216,582

1,449,841,009

Sales, maturities and paydowns

(1,132,085,830)

(1,614,880,058)

Transfer to mortgage loans held for investment

(201,951)

Total gains (losses) included in earnings

24,105,293

^[3]

46,498,954

^[4]

Total gains (losses) included in other comprehensive income

Loans Held for Sale, Ending

234,012,872

304,030,372

Fixed Maturity Securities Available For Sale 1 [Member]

Subsidiary, Sale of Stock [Line Items]

Fixed Maturity Securities Available for Sale, Beginning

2,023,348

2,201,175

Originations and purchases

Sales, maturities and paydowns

(11,950)

(11,100)

Transfer to mortgage loans held for investment

Total gains (losses) included in earnings

961

^[5]

893

^[6]

Total gains (losses) included in other comprehensive income

(587)

125

Fixed Maturity Securities Available for Sale, Ending

$ 2,011,772

$ 2,191,093

[1]	Included in other assets on the consolidated balance sheets
[2]	Included in other assets on the consolidated balance sheets
[3]	As a component of Mortgage fee income on the condensed consolidated statements of earnings
[4]	As a component of Mortgage fee income on the condensed consolidated statements of earnings
[5]	As a component of Net investment income on the condensed consolidated statements of earnings
[6]	As a component of Net investment income on the condensed consolidated statements of earnings

X

- Definition

Derivatives Interest Rate Lock Commitments.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Fair Value, Gains (Losses) included in earnings, during the indicated time period.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the monetary amount of Originations, during the indicated time period.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the monetary amount of Sales, during the indicated time period.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Total gains (losses) included in other comprehensive income.

+ References

No definition available.

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Namespace Prefix:	SNFCA_
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Balance Type:	credit
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X

- Definition

Represents the monetary amount of Transfer to mortgage loans held for investment, during the indicated time period.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26626-111562

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X

- Definition

Amount, before valuation allowance, of financing receivable classified as held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004

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Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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