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Loans and Allowance for Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Financing receivable newly restructured loans by type of modification [Abstract] |  |
Number of Loans | $ 1 rbnf_FinancingReceivableNumberOfLoans | $ 2 rbnf_FinancingReceivableNumberOfLoans
Pre Modification | 16 rbnf_FinancingReceivablePreModification | 22 rbnf_FinancingReceivablePreModification
Post Modification | 16 rbnf_FinancingReceivablePostModification | 22 rbnf_FinancingReceivablePostModification
Interest Only |  |
Term | 16 rbnf_FinancingReceivableModificationTerm | 22 rbnf_FinancingReceivableModificationTerm
Combination |  |
Total Modification | 16 rbnf_FinancingReceivableModification | 22 rbnf_FinancingReceivableModification
Residential Real Estate [Member] |  |
Financing receivable newly restructured loans by type of modification [Abstract] |  |
Number of Loans |  | 1 rbnf_FinancingReceivableNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Pre Modification |  | 12 rbnf_FinancingReceivablePreModification / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Post Modification |  | 12 rbnf_FinancingReceivablePostModification / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Interest Only |  |
Term |  | 12 rbnf_FinancingReceivableModificationTerm / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Combination |  |
Total Modification |  | 12 rbnf_FinancingReceivableModification / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Consumer & Other [Member] |  |
Financing receivable newly restructured loans by type of modification [Abstract] |  |
Number of Loans | 1 rbnf_FinancingReceivableNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember |
Pre Modification | 16 rbnf_FinancingReceivablePreModification / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember |
Post Modification | 16 rbnf_FinancingReceivablePostModification / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember |
Interest Only |  |
Term | 16 rbnf_FinancingReceivableModificationTerm / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember |
Combination |  |
Total Modification | 16 rbnf_FinancingReceivableModification / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_OtherPortfolioSegmentMember |
Home Equity & Consumer [Member] |  |
Financing receivable newly restructured loans by type of modification [Abstract] |  |
Number of Loans |  | 1 rbnf_FinancingReceivableNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_HomeEquityConsumerPortfolioSegmentMember
Pre Modification |  | 10 rbnf_FinancingReceivablePreModification / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_HomeEquityConsumerPortfolioSegmentMember
Post Modification |  | 10 rbnf_FinancingReceivablePostModification / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_HomeEquityConsumerPortfolioSegmentMember
Interest Only |  |
Term |  | 10 rbnf_FinancingReceivableModificationTerm / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_HomeEquityConsumerPortfolioSegmentMember
Combination |  |
Total Modification |  | $ 10 rbnf_FinancingReceivableModification / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rbnf_HomeEquityConsumerPortfolioSegmentMember

X
- Definition Financing receivable total modification (combination, term,interest). + References No definition available. + Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing receivable modification combination. + References No definition available. + Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing receivable modification interest. + References No definition available. + Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing receivable modification term. + References No definition available. + Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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- Definition Financing receivable number of loans. + References No definition available. + Details
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Balance Type: | debit
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- Definition Financing receivable post modification. + References No definition available. + Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing receivable pre modification. + References No definition available. + Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |