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

X

- Definition

Financing receivable modification combination.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Financing receivable modification interest.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Financing receivable modification term.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Financing receivable number of loans.

+ References

No definition available.

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Namespace Prefix:	rbnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Financing receivable post modification.

+ References

No definition available.

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Namespace Prefix:	rbnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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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X

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