XML 53 R41.htm IDEA: XBRL DOCUMENT
v3.20.2

3) Investments: Net Investment Income - Additional (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Net investment income | $ 14,709,142 | $ 10,478,566 | $ 41,072,386 | $ 31,061,069 |
Securities on deposit for regulatory authorities | 9,735,147 |  | 9,735,147 |  | $ 9,633,818
Cemeteries And Mortuaries |  |  |  |  |
Net investment income | $ 129,347 | $ 102,888 | $ 380,079 | $ 323,404 |

X
- Definition Represents the monetary amount of Securities on deposit for regulatory authorities, as of the indicated date. + References No definition available. + Details
Name: | snfc_SecuritiesOnDepositForRegulatoryAuthorities
Namespace Prefix: | snfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
Name: | us-gaap_NetInvestmentIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | snfc_RestrictedAssetsAxis=snfc_CemeteriesAndMortuariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |