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Loans and Allowance for Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Financing receivable newly restructured loans by type of modification [Abstract] |  |
Interest Only |  |
Term | 22 | 638
Combination |  | 241
Total Modification | 22 | 879
Residential Real Estate [Member] |  |
Financing receivable newly restructured loans by type of modification [Abstract] |  |
Interest Only |  |
Term | 12 | 419
Combination |  | 241
Total Modification | 12 |
Home Equity & Consumer [Member] |  |
Financing receivable newly restructured loans by type of modification [Abstract] |  |
Interest Only |  |
Term | 10 | 21
Combination |  |
Total Modification | 10 |
Commercial Real Estate [Member] |  |
Financing receivable newly restructured loans by type of modification [Abstract] |  |
Term |  | 198
Combination |  |

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- Definition Financing receivable total modification (combination, term,interest). + References No definition available. + Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing receivable modification combination. + References No definition available. + Details
Name: | rbnf_FinancingReceivableModificationCombination
Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing receivable modification interest. + References No definition available. + Details
Name: | rbnf_FinancingReceivableModificationInterest
Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing receivable modification term. + References No definition available. + Details
Name: | rbnf_FinancingReceivableModificationTerm
Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:stringItemType
Balance Type: | na
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