XML 127 R94.htm IDEA: XBRL DOCUMENT v3.8.0.1

Disclosures About Fair Value of Assets and Liabilities (Details Textual)	12 Months Ended
	Dec. 31, 2017
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 constant prepayment 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