XML 18 R6.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Statement of Stockholders' Equity [Abstract] |  |
Dividend common stock, per share amount | $ 0.065 | $ 0.055
Dividend preferred stock, per share amount | $ 0.1625 | $ 0.1625

X
- Definition Dividend common stock per share amount. + References No definition available. + Details
Name: | sbfg_DividendCommonStockPerShareAmount
Namespace Prefix: | sbfg_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dividend preferred stock per share amount. + References No definition available. + Details
Name: | sbfg_DividendPreferredStockPerShareAmount
Namespace Prefix: | sbfg_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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