XML 104 R89.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Disclosures About Fair Value of Assets and Liabilities (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2016
Disclosures About Fair Value Of Assets And Liabilities (Textual) |
Interest rate on mortgage service description | The mortgage servicing rights have increased substantially in value. The servicing rights have had a decline in prepayments and the .10 percent decrease in the discount rate reflects the change in market rates.

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

X
- Definition Interest rate on mortgage service description. + References No definition available. + Details
Name: | sbfg_InterestRateOnMortgageServiceDescription
Namespace Prefix: | sbfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration