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Loans and Allowance for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and leases receivable, gross	$ 511,863us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 516,492us-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	1,043us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeOneToTwoPassMember	1,275us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	250,660us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeThreePassMember	253,808us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	243,739us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeFourPassMember	243,845us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeFourPassMember
Pass [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and leases receivable, gross	495,442us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_PassMember	498,928us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_PassMember
Special Mention [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and leases receivable, gross	7,326us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SpecialMentionMember	7,551us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	4,746us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SubstandardMember	5,541us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	4,349us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_DoubtfulMember	4,472us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	85,100us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	88,485us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
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	921us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	1,148us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
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	23,043us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	23,580us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
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	59,479us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	61,691us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
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	83,443us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	86,419us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
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	50us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	83us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
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	323us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	752us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
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	1,284us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember	1,231us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialAndIndustrialPortfolioSegmentMember
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	217,610us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	217,030us-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	63us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	66us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	64,940us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	67,779us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	140,533us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	136,427us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	205,536us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	204,272us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	6,054us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	6,224us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	4,060us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	4,422us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	1,960us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_CommercialReConstructionPortfolioSegmentMember	2,112us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	44,266us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	46,217us-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	59us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeOneToTwoPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	61us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	8,723us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	9,505us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	35,484us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	36,651us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	44,266us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_AgriculturalFarmlandPortfolioSegmentMember	46,217us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	114,703us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	113,214us-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	107,291us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	105,149us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	4,987us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	5,611us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	112,278us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	110,760us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	1,149us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	1,160us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	309us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	312us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	967us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember	982us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = 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	50,184us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	51,546us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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
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	46,663us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	47,795us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeThreePassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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	3,256us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	3,465us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = rbnf_LoanGradeFourPassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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	49,919us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	51,260us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_PassMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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	73us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	84us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SpecialMentionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Consumer & Other [Member] | Substandard [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and leases receivable, gross	54us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	55us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_SubstandardMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Consumer & Other [Member] | Doubtful [Member]
Summary of credit risk profile of the Company's loan portfolio based on rating category
Loans and leases receivable, gross	138us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	147us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / rbnf_CreditRatingCategoryAxis = us-gaap_DoubtfulMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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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- Details

Name:	rbnf_CreditRiskProfileOfCompanyLoanPortfolioBasedOnRatingCategoryAbstract
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- Definition

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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