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Loans and Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Summary of loan portfolio aging analysis
Total past due	$ 6,817us-gaap_FinancingReceivableRecordedInvestmentPastDue	$ 7,074us-gaap_FinancingReceivableRecordedInvestmentPastDue
Current	505,046us-gaap_FinancingReceivableRecordedInvestmentCurrent	509,418us-gaap_FinancingReceivableRecordedInvestmentCurrent
Total loans receivable	511,863us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	516,492us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
30 to 59 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	3,813us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables30To59DaysPastDueMember	3,863us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables30To59DaysPastDueMember
60 to 89 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	230us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables60To89DaysPastDueMember	100us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables60To89DaysPastDueMember
Greater than 90 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	2,774us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember	3,111us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Commercial & Industrial [Member]
Summary of loan portfolio aging analysis
Total past due	974us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	987us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Current	84,126us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	87,498us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Total loans receivable	85,100us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	88,485us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
Commercial & Industrial [Member] | 30 to 59 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due
Commercial & Industrial [Member] | 60 to 89 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	2us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables60To89DaysPastDueMember
Commercial & Industrial [Member] | Greater than 90 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	972us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember	987us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Commercial RE & Construction [Member]
Summary of loan portfolio aging analysis
Total past due	5,433us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	5,407us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Current	212,177us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	211,623us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Total loans receivable	217,610us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	217,030us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Commercial RE & Construction [Member] | 30 to 59 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	3,708us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables30To59DaysPastDueMember	3,660us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables30To59DaysPastDueMember
Commercial RE & Construction [Member] | 60 to 89 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	228us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables60To89DaysPastDueMember
Commercial RE & Construction [Member] | Greater than 90 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	1,497us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember	1,747us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Agricultural & Farmland [Member]
Summary of loan portfolio aging analysis
Total past due
Current	44,266us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	46,217us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Total loans receivable	44,266us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	46,217us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Agricultural & Farmland [Member] | 30 to 59 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due
Agricultural & Farmland [Member] | 60 to 89 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due
Agricultural & Farmland [Member] | Greater than 90 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due
Residential Real Estate [Member]
Summary of loan portfolio aging analysis
Total past due	353us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	560us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Current	114,350us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	112,654us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Total loans receivable	114,703us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	113,214us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Residential Real Estate [Member] | 30 to 59 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	48us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables30To59DaysPastDueMember	164us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables30To59DaysPastDueMember
Residential Real Estate [Member] | 60 to 89 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due		19us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables60To89DaysPastDueMember
Residential Real Estate [Member] | Greater than 90 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	305us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember	377us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Consumer & Other [Member]
Summary of loan portfolio aging analysis
Total past due	57us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	120us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Current	50,127us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	51,426us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Total loans receivable	50,184us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	51,546us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Consumer & Other [Member] | 30 to 59 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due	57us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables30To59DaysPastDueMember	39us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables30To59DaysPastDueMember
Consumer & Other [Member] | 60 to 89 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due		81us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables60To89DaysPastDueMember
Consumer & Other [Member] | Greater than 90 Days Past Due [Member]
Summary of loan portfolio aging analysis
Total past due

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Financing receivables that are current.

+ References

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 45

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