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Loans and Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Loan	Jun. 30, 2013 Loan	Jun. 30, 2014 Loan	Jun. 30, 2013 Loan
Summary of newly restructured loans by type of modification
Number of Loans				2
Pre-Modification Recorded Balance				$ 26
Post-Modification Recorded Balance				26
Interest Only
Term		26		26
Combination
Total Modification		26		26
Residential Real Estate [Member]
Summary of newly restructured loans by type of modification
Number of Loans				1
Pre-Modification Recorded Balance				14
Post-Modification Recorded Balance				14
Interest Only
Term		14		14
Combination
Total Modification		14		14
Consumer & Other [Member]
Summary of newly restructured loans by type of modification
Number of Loans				1
Pre-Modification Recorded Balance				12
Post-Modification Recorded Balance				12
Interest Only
Term		12		12
Combination
Total Modification		$ 12		$ 12

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

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=35738203&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
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=35738203&loc=SL6953676-111524

+ Details

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