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Disclosures About Fair Value of Assets and Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Impaired loans [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 2,538us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_ImpairedLoansMember	$ 3,540us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_ImpairedLoansMember
Impaired loans [Member] | Level 1 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Impaired loans [Member] | Level 2 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Impaired loans [Member] | Level 3 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	2,538us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	3,540us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Mortgage Servicing Rights [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	3,037us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_MortgageServicingRightsMember	2,029us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_MortgageServicingRightsMember
Mortgage Servicing Rights [Member] | Level 1 [Member]
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]
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]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	3,037us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	2,029us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Foreclosed Assets [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring		45us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_ForeclosedAssetsMember
Foreclosed Assets [Member] | Level 1 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Foreclosed Assets [Member] | Level 2 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Foreclosed Assets [Member] | Level 3 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring		$ 45us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_BalanceSheetLocationAxis = rbnf_ForeclosedAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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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.

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