XML 113 R100.htm IDEA: XBRL DOCUMENT
v3.21.1

10) Reinsurance, Commitments and Contingencies: Other Contingencies and Commitments (Details) | Dec. 31, 2020 USD ($)
--- | ---
Text Block [Abstract] |
Commitments to fund new residential construction loans | $ 185,751,000
Commitments to fund new residential construction loans funded | $ 115,898,000

X
- Definition Represents the monetary amount of Commitments to fund new residential construction loans, as of the indicated date. + References No definition available. + Details
Name: | snfc_CommitmentsToFundNewResidentialConstructionLoans
Namespace Prefix: | snfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the monetary amount of Commitments to fund new residential construction loans funded, as of the indicated date. + References No definition available. + Details
Name: | snfc_CommitmentsToFundNewResidentialConstructionLoansFunded
Namespace Prefix: | snfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration