Financing receivable total modification (combination, term,interest).

No definition available.

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

- 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

- 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

- 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

- 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

- Definition

Financing Receivable Troubled Debt Restructurings.

+ References

No definition available.

+ Details

Name:	rbnf_FinancingReceivableNewlyRestructuredLoansByTypeOfModificationAbstract
Namespace Prefix:	rbnf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Details

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

Loans and Allowance for Loan Losses (Details 5) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) Loan	Sep. 30, 2014 USD ($) Loan	Sep. 30, 2015 USD ($) Loan	Sep. 30, 2014 USD ($) Loan
Summary of newly restructured loans by type of modification
Number of Loans \| Loan			1
Pre-Modification Recorded Balance			$ 24
Post-Modification Recorded Balance			$ 24
Interest Only
Term	$ 24		$ 24
Combination
Total Modification	$ 24		$ 24
Residential Real Estate [Member]
Summary of newly restructured loans by type of modification
Number of Loans \| Loan			1
Pre-Modification Recorded Balance			$ 24
Post-Modification Recorded Balance			$ 24
Interest Only
Term	$ 24		$ 24
Combination
Total Modification	$ 24		$ 24
Consumer & Other [Member]
Summary of newly restructured loans by type of modification
Number of Loans \| Loan
Pre-Modification Recorded Balance
Post-Modification Recorded Balance
Interest Only
Term
Combination
Total Modification