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Loans and Allowance for Loan Losses (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Summary of balance of the allowance for loan losses and the recorded investment in loans
Beginning balance	$ 6,771us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 6,964us-gaap_FinancingReceivableAllowanceForCreditLosses
Charge Offs	(302)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs	(323)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Recoveries	11us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery	85us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Provision	350us-gaap_ProvisionForLoanLeaseAndOtherLosses
Ending Balance	6,830us-gaap_FinancingReceivableAllowanceForCreditLosses	6,726us-gaap_FinancingReceivableAllowanceForCreditLosses
Ending balance: individually evaluated for impairment	1,787us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1		1,811us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Ending balance: collectively evaluated for impairment	5,043us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment		4,960us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Loans, Ending balance individually evaluated for impairment	5,320us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment		5,431us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Loans, Ending balance collectively evaluated for impairment	506,543us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment		511,061us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Commercial & Industrial [Member]
Summary of balance of the allowance for loan losses and the recorded investment in loans
Beginning balance	1,630us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	2,175us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Charge Offs	(8)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	(307)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Recoveries	5us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	10us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Provision	(53)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	24us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Ending Balance	1,574us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	1,902us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Ending balance: individually evaluated for impairment	510us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember		510us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Ending balance: collectively evaluated for impairment	1,064us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember		1,120us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Loans, Ending balance individually evaluated for impairment	1,268us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember		1,268us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Loans, Ending balance collectively evaluated for impairment	83,832us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember		87,217us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Commercial RE & Construction [Member]
Summary of balance of the allowance for loan losses and the recorded investment in loans
Beginning balance	2,857us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	2,708us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Charge Offs	(250)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Recoveries		52us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Provision	285us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	(9)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Ending Balance	2,892us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	2,751us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Ending balance: individually evaluated for impairment	1,002us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember		1,018us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Ending balance: collectively evaluated for impairment	1,890us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember		1,839us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Loans, Ending balance individually evaluated for impairment	1,991us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember		2,035us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Loans, Ending balance collectively evaluated for impairment	215,619us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember		214,995us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Agricultural & Farmland [Member]
Summary of balance of the allowance for loan losses and the recorded investment in loans
Beginning balance	208us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	159us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Charge Offs
Recoveries	1us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Provision	3us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	18us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Ending Balance	212us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	177us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	212us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember		208us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Loans, Ending balance individually evaluated for impairment
Loans, Ending balance collectively evaluated for impairment	44,266us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember		46,217us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Residential Real Estate [Member]
Summary of balance of the allowance for loan losses and the recorded investment in loans
Beginning balance	1,308us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	1,067us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Charge Offs	(13)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	(15)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Recoveries	2us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	5us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Provision	21us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	104us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Ending Balance	1,318us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	1,161us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Ending balance: individually evaluated for impairment	203us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember		242us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Ending balance: collectively evaluated for impairment	1,115us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember		1,066us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Loans, Ending balance individually evaluated for impairment	1,592us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember		1,647us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Loans, Ending balance collectively evaluated for impairment	113,111us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember		111,567us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Home Equity & Consumer [Member]
Summary of balance of the allowance for loan losses and the recorded investment in loans
Ending Balance		982us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_HomeEquityConsumerPortfolioSegmentMember
Consumer & Other [Member]
Summary of balance of the allowance for loan losses and the recorded investment in loans
Beginning balance	768us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	855us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Charge Offs	(31)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	(1)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Recoveries	3us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	18us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Provision	94us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	(137)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Ending Balance	834us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	735us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Ending balance: individually evaluated for impairment	72us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember		41us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Ending balance: collectively evaluated for impairment	762us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember		727us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Loans, Ending balance individually evaluated for impairment	469us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember		481us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Loans, Ending balance collectively evaluated for impairment	$ 49,715us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember		$ 51,065us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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