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Fair Value of Assets and Liabilities (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Collateral-dependent impaired loans [Member] | Comparability adjustments (%) [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 $ 1,551us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rbnf_CollateralDependentImpairedLoansMember
/ rbnf_UnobservableInputsAxis
= rbnf_ComparabilityAdjustmentsPercentMember		 $ 2,538us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rbnf_CollateralDependentImpairedLoansMember
/ rbnf_UnobservableInputsAxis
= rbnf_ComparabilityAdjustmentsPercentMember
Fair Value Measurements, Valuation Technique Market comparable properties Market comparable properties
Fair Value Measurements, Unobservable Inputs Comparability adjustments (%) Comparability adjustments (%)
Mortgage servicing rights [Member] | Discount Rate [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 $ 2,841us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rbnf_MortgageServicingRightsMember
/ rbnf_UnobservableInputsAxis
= rbnf_DiscountRateMember		 $ 3,037us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rbnf_MortgageServicingRightsMember
/ rbnf_UnobservableInputsAxis
= rbnf_DiscountRateMember
Fair Value Measurements, Valuation Technique Discounted cash flow Discounted cash flow
Fair Value Measurements, Unobservable Inputs Discount Rate Discount Rate
Fair Value Measurements, Range (Weighted Average) 9.50%rbnf_FairValueInputInterestRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rbnf_MortgageServicingRightsMember
/ rbnf_UnobservableInputsAxis
= rbnf_DiscountRateMember		 9.50%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 Inputs Constant prepayment rate Constant prepayment rate
Fair Value Measurements, Range (Weighted Average) 10.70%rbnf_FairValueInputInterestRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rbnf_MortgageServicingRightsMember
/ rbnf_UnobservableInputsAxis
= rbnf_ConstantPrepaymentRateMember		 10.70%rbnf_FairValueInputInterestRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rbnf_MortgageServicingRightsMember
/ rbnf_UnobservableInputsAxis
= rbnf_ConstantPrepaymentRateMember
Mortgage servicing rights [Member] | P&I earnings credit [Member]    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value Measurements, Unobservable Inputs P&I earnings credit P&I earnings credit
Fair Value Measurements, Range (Weighted Average) 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] | T&I earnings credit [Member]    
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements    
Fair Value Measurements, Unobservable Inputs T&I earnings credit T&I earnings credit
Fair Value Measurements, Range (Weighted Average) 1.63%rbnf_FairValueInputInterestRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rbnf_MortgageServicingRightsMember
/ rbnf_UnobservableInputsAxis
= rbnf_TAndIEarningsCreditMember		 1.75%rbnf_FairValueInputInterestRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= rbnf_MortgageServicingRightsMember
/ rbnf_UnobservableInputsAxis
= rbnf_TAndIEarningsCreditMember
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 Inputs Inflation for cost of servicing Inflation for cost of servicing
Fair Value Measurements, Range (Weighted Average) 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