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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
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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- 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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Data Type:	xbrli:monetaryItemType
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