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Loans and Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Summary of newly restructured loans by type of modification |  |
Interest Only |  |
Term | 24 | 142
Combination |  | 192
Total Modification | 24 | 334
Residential Real Estate [Member] |  |
Summary of newly restructured loans by type of modification |  |
Interest Only |  |
Term | 13 | 142
Combination |  | 192
Total Modification | 13 | 334
Consumer [Member] |  |
Summary of newly restructured loans by type of modification |  |
Interest Only |  |
Term | 11 |
Combination |  |
Total Modification | $ 11 |

X
- 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
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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 term. + 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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- Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:stringItemType
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