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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividend common stock, Per share amount	$ 0.045rbnf_DividendCommonStockPerShareAmount	$ 0.025rbnf_DividendCommonStockPerShareAmount
Dividend preferred stock per share amount	$ 0.15rbnf_DividendPreferredStockPerShareAmount

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- Definition

Dividend common stock per share amount.

+ References

No definition available.

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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- Definition

Dividend preferred stock per share amount.

+ References

No definition available.

+ Details

Name:	rbnf_DividendPreferredStockPerShareAmount
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