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Fair Value of Assets and Liabilities (Details) (Available-For-Sale Securities [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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U.S. Treasury and Government Agencies [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | $ 15,071us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | $ 15,307us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
Mortgage-backed securities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 59,827us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 50,740us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
State and political subdivisions [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 19,135us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 19,170us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Equity securities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 23us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 23us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Interest Rate Contracts Assets [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 502us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractsAssetsMember | 273us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractsAssetsMember
Interest Rate Contracts Liabilities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | (502)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractsLiabilitiesMember | (273)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractsLiabilitiesMember
Level 1 [Member] | U.S. Treasury and Government Agencies [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Mortgage-backed securities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | State and political subdivisions [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Equity securities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Interest Rate Contracts Assets [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Interest Rate Contracts Liabilities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 2 [Member] | U.S. Treasury and Government Agencies [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 15,071us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 15,307us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
Level 2 [Member] | Mortgage-backed securities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 59,827us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 50,740us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Level 2 [Member] | State and political subdivisions [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 19,135us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 19,170us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Level 2 [Member] | Equity securities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 23us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 23us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Level 2 [Member] | Interest Rate Contracts Assets [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 502us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractsAssetsMember | 273us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractsAssetsMember
Level 2 [Member] | Interest Rate Contracts Liabilities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | (502)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractsLiabilitiesMember | (273)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractsLiabilitiesMember
Level 3 [Member] | U.S. Treasury and Government Agencies [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Mortgage-backed securities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | State and political subdivisions [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Equity securities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Interest Rate Contracts Assets [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Interest Rate Contracts Liabilities [Member] |  |
Summary of fair value measurements of assets measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |

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- Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:stringItemType
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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 recurring 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_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant