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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Statements of Stockholders' Equity [Abstract]
Dividend common stock, Per share amount	$ 0.20	$ 0.16
Dividend preferred stock, Per share amount	$ 0.6374

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- Definition

Dividend common stock per share amount.

+ References

No definition available.

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- Definition

Dividend preferred 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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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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