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Condensed Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $) | 9 Months Ended
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Sep. 30, 2013
Statement Of Stockholders' Equity [Abstract] |
Dividend common stock, Per share amount | $ 0.85

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- Definition Dividend common stock per share amount. + References No definition available. + Details
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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