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Disclosures About Fair Value of Assets and Liabilities (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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 | $ 2,538 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_CollateralDependentImpairedLoansMember | $ 3,540 us-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 | 45 us-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 | $ 3,037 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rbnf_MortgageServicingRightsMember | $ 2,029 us-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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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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