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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