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Loans and Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 Loan
Summary of newly restructured loans by type of modification |
Number of Loans | 1rbnf_FinancingReceivableModificationNumberOfLoans
Pre-Modification Recorded Balance | $ 24us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-Modification Recorded Balance | 24us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Interest Only |
Term | 24rbnf_FinancingReceivableModificationTerm
Combination |
Total Modification | 24rbnf_FinancingReceivableModification
Residential Real Estate [Member] |
Summary of newly restructured loans by type of modification |
Number of Loans | 1rbnf_FinancingReceivableModificationNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Pre-Modification Recorded Balance | 24us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Post-Modification Recorded Balance | 24us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Interest Only |
Term | 24rbnf_FinancingReceivableModificationTerm / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Combination |
Total Modification | 24rbnf_FinancingReceivableModification / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember
Consumer & Other [Member] |
Summary of newly restructured loans by type of modification |
Pre-Modification Recorded Balance |
Post-Modification Recorded Balance |
Interest Only |
Combination |
Total Modification |

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

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

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

X
- Definition Financing Receivable Modification Number of Loans. + References No definition available. + Details
Name: | rbnf_FinancingReceivableModificationNumberOfLoans
Namespace Prefix: | rbnf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | rbnf_FinancingReceivableNewlyRestructuredLoansByTypeOfModificationAbstract
Namespace Prefix: | rbnf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rbnf_ConsumerAndOtherPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |