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Loans and Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	$ 516,492us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 477,577us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Loan Grade 1-2 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	1,275us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToTwoPassMember	1,863us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToTwoPassMember
Loan Grade 3 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	253,808us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember	206,822us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember
Loan Grade 4 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	243,845us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember	245,122us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember
Loan Grade One To Four Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	498,928us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToFourPassMember	453,807us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToFourPassMember
Special Mention [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	7,551us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SpecialMentionMember	13,535us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SpecialMentionMember
Substandard [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	5,541us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SubstandardMember	5,221us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SubstandardMember
Doubtful [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	4,472us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_DoubtfulMember	5,014us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_DoubtfulMember
Loss [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross
Commercial & Industrial [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	88,485us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	85,642us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial & Industrial [Member] | Loan Grade 1-2 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	1,148us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	1,619us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial & Industrial [Member] | Loan Grade 3 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	23,580us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	22,328us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial & Industrial [Member] | Loan Grade 4 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	61,691us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	56,188us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial & Industrial [Member] | Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	86,419us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	80,135us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial & Industrial [Member] | Special Mention [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	83us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	3,159us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial & Industrial [Member] | Substandard [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	752us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	32us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial & Industrial [Member] | Doubtful [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	1,231us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	2,316us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial & Industrial [Member] | Loss [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross
Commercial RE & Construction [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	217,030us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	205,301us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Commercial RE & Construction [Member] | Loan Grade 1-2 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	66us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	81us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Commercial RE & Construction [Member] | Loan Grade 3 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	67,779us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	44,095us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Commercial RE & Construction [Member] | Loan Grade 4 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	136,427us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	146,861us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Commercial RE & Construction [Member] | Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	204,272us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	191,037us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Commercial RE & Construction [Member] | Special Mention [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	6,224us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	8,917us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Commercial RE & Construction [Member] | Substandard [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	4,422us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	4,815us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Commercial RE & Construction [Member] | Doubtful [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	2,112us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	532us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember
Commercial RE & Construction [Member] | Loss [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross
Agricultural & Farmland [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	46,217us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	39,210us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Agricultural & Farmland [Member] | Loan Grade 1-2 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	61us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	76us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Agricultural & Farmland [Member] | Loan Grade 3 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	9,505us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	6,543us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Agricultural & Farmland [Member] | Loan Grade 4 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	36,651us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	32,591us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Agricultural & Farmland [Member] | Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	46,217us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	39,210us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember
Agricultural & Farmland [Member] | Special Mention [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross
Agricultural & Farmland [Member] | Substandard [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross
Agricultural & Farmland [Member] | Doubtful [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross
Agricultural & Farmland [Member] | Loss [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross
Residential Real Estate [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	113,214us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	99,620us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Residential Real Estate [Member] | Loan Grade 1-2 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross
Residential Real Estate [Member] | Loan Grade 3 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	105,149us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	90,606us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Residential Real Estate [Member] | Loan Grade 4 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	5,611us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	5,700us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Residential Real Estate [Member] | Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	110,760us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	96,306us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Residential Real Estate [Member] | Special Mention [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	1,160us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	1,373us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Residential Real Estate [Member] | Substandard [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	312us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	290us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Residential Real Estate [Member] | Doubtful [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	982us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	1,651us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Residential Real Estate [Member] | Loss [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross
Consumer & Other [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	51,546us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember	47,804us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember
Consumer & Other [Member] | Loan Grade 1-2 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross		87us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember
Consumer & Other [Member] | Loan Grade 3 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	47,795us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember	43,250us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember
Consumer & Other [Member] | Loan Grade 4 Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	3,465us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember	3,782us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember
Consumer & Other [Member] | Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	51,260us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember	47,119us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember
Consumer & Other [Member] | Special Mention [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross	84us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember	86us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_CreditRatingAMBestAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember
Consumer & Other [Member] | Substandard [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
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Consumer & Other [Member] | Doubtful [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
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Consumer & Other [Member] | Loss [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and Leases Receivable, Gross

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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