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Fair Value of Assets and Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Impaired loans [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring | $ 1,511 | $ 2,227
Impaired loans [Member] | Level 1 [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring |  |
Impaired loans [Member] | Level 2 [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring |  |
Impaired loans [Member] | Level 3 [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring | 1,511 | 2,227
Mortgage Servicing Rights [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring | 2,388 | 2,667
Mortgage Servicing Rights [Member] | Level 1 [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring |  |
Mortgage Servicing Rights [Member] | Level 2 [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring |  |
Mortgage Servicing Rights [Member] | Level 3 [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring | 2,388 | 2,667
Foreclosed Assets [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring | 84 | 950
Foreclosed Assets [Member] | Level 1 [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring |  |
Foreclosed Assets [Member] | Level 2 [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring |  |
Foreclosed Assets [Member] | Level 3 [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring | $ 84 | $ 950

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- Details
Name: | rbnf_FairValueMeasurementsOfAssetsMeasuredAtFairValueOnNonRecurringBasisAbstract
Namespace Prefix: | rbnf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant