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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Statements of Stockholders' Equity [Abstract] |  |
Dividend common stock, Per share amount | $ 0.16 rbnf_DividendCommonStockPerShareAmount | $ 0.12 rbnf_DividendCommonStockPerShareAmount

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

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- Details
Name: | us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration