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Condensed Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $)	9 Months Ended
	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

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