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Disclosures About Fair Value of Assets and Liabilities (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Collateral-dependent impaired loans [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 2,538us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_CollateralDependentImpairedLoansMember	$ 3,540us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_CollateralDependentImpairedLoansMember
Fair Value Measurements, Valuation Techniques	Market comparable properties	Market comparable properties
Collateral-dependent impaired loans [Member] | Comparability Adjustments Percent [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements
Fair Value Measurements Unobservable Input Description	Comparability adjustments (%)	Comparability adjustments (%)
Fair Value Input Interest Rate
Foreclosed assets [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	45us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_OtherRealEstateOwnedMember
Foreclosed assets [Member] | Marketability Discount [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements
Fair Value Measurements Unobservable Input Description		Marketability discount
Fair Value Input Interest Rate		10.00%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_OtherRealEstateOwnedMember / rbnf_UnobservableInputsAxis = rbnf_MarketabilityDiscountMember
Mortgage servicing rights [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 3,037us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember	$ 2,029us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember
Fair Value Measurements, Valuation Techniques	Discounted cash flow	Discounted cash flow
Mortgage servicing rights [Member] | Discount Rate [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements
Fair Value Measurements Unobservable Input Description	Discount Rate	Discount Rate
Fair Value Input Interest Rate	9.50%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember / rbnf_UnobservableInputsAxis = rbnf_DiscountRateMember	10.25%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember / rbnf_UnobservableInputsAxis = rbnf_DiscountRateMember
Mortgage servicing rights [Member] | Constant Prepayment Rate [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements
Fair Value Measurements Unobservable Input Description	Constant prepayment rate	Constant prepayment rate
Fair Value Input Interest Rate	10.30%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember / rbnf_UnobservableInputsAxis = rbnf_ConstantPrepaymentRateMember	8.50%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember / rbnf_UnobservableInputsAxis = rbnf_ConstantPrepaymentRateMember
Mortgage servicing rights [Member] | T and I Earnings Credit [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements
Fair Value Measurements Unobservable Input Description	T&I earnings credit	T&I earnings credit
Fair Value Input Interest Rate	1.75%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember / rbnf_UnobservableInputsAxis = rbnf_TAndIEarningsCreditMember	1.54%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember / rbnf_UnobservableInputsAxis = rbnf_TAndIEarningsCreditMember
Mortgage servicing rights [Member] | P and I Earnings Credit [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements
Fair Value Measurements Unobservable Input Description	P&I earnings credit	P&I earnings credit
Fair Value Input Interest Rate	0.17%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember / rbnf_UnobservableInputsAxis = rbnf_PAndIEarningsCreditMember	0.17%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember / rbnf_UnobservableInputsAxis = rbnf_PAndIEarningsCreditMember
Mortgage servicing rights [Member] | Inflation For Cost Of Servicing [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements
Fair Value Measurements Unobservable Input Description	Inflation for cost of servicing	Inflation for cost of servicing
Fair Value Input Interest Rate	1.50%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember / rbnf_UnobservableInputsAxis = rbnf_InflationForCostOfServicingMember	1.50%rbnf_FairValueInputInterestRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember / rbnf_UnobservableInputsAxis = rbnf_InflationForCostOfServicingMember

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Description of the inputs and valuation technique(s) used to measure fair value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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-Section 50

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