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Disclosures About Fair Value of Assets and Liabilities (Details) (Available-For-Sale Securities [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | $ 15,307 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | $ 11,300 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 50,740 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 57,223 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
State and political subdivisions [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 19,170 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 18,155 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Money Market Mutual Fund [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  | 3,092 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember
Equity securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 23 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 23 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Interest Rate Contract Asset [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 273 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractAssetMember | 257 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractAssetMember
Interest Rate Contract Liabilities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | (273)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractLiabilitiesMember | (257)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractLiabilitiesMember
Level 1 [Member] | U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | State and political subdivisions [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Money Market Mutual Fund [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  | 3,092 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember
Level 2 [Member] | U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 15,307 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 11,300 us-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] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 50,740 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 57,223 us-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] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 19,170 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 18,155 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Level 2 [Member] | Money Market Mutual Fund [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 2 [Member] | Equity securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 23 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 23 us-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 Contract Asset [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 273 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractAssetMember | 257 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractAssetMember
Level 2 [Member] | Interest Rate Contract Liabilities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | (273)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractLiabilitiesMember | (257)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractLiabilitiesMember
Level 3 [Member] | U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | State and political subdivisions [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Money Market Mutual Fund [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |

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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
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