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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
U.S. Treasury and Government agencies [Member]
Fair value measurements of securities measured at fair value on a recurring basis
Assets, Fair value, Recurring	$ 15,307us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember	$ 11,300us-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	50,740us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember	57,223us-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	19,170us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	18,155us-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		3,092us-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	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 Contract Asset [Member]
Fair value measurements of securities measured at fair value on a recurring basis
Assets, Fair value, Recurring	273us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractAssetMember	257us-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		3,092us-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	15,307us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember	11,300us-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	50,740us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember	57,223us-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	19,170us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	18,155us-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	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 Contract Asset [Member]
Fair value measurements of securities measured at fair value on a recurring basis
Assets, Fair value, Recurring	273us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_InterestRateContractAssetMember	257us-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.

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No definition available.

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