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Fair Value of Assets and Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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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 | $ 1,551us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_ImpairedLoansMember | $ 2,538us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_ImpairedLoansMember
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 | 1,551us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 2,538us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Mortgage Servicing Rights [Member] |  |
Summary of fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, Fair value, Nonrecurring | 2,841us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_MortgageServicingRightsMember | 3,037us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_MortgageServicingRightsMember
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 | $ 2,841us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 3,037us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Details
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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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=rbnf_MortgageServicingRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |