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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 6) (Residential Real Estate [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2011
Residential Real Estate [Member]
Number of Contracts	$ 2	$ 10	$ 14
Pre- Modification Recorded Investment	60	334	1,011
Post- Modification Recorded Investment	$ 60	$ 334	$ 1,011

X

- Definition

The number of financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	rbnf_FinancingReceivableModificationNumberOfContract
Namespace Prefix:	rbnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of investment in financing receivables (after modification) modified by troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	rbnf_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	rbnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of investment in financing receivables (before modification) modified by troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	rbnf_FinancingReceivableModificationsPreModificationRecordedInvestments
Namespace Prefix:	rbnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration