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Loans and Allowance for Loan Losses (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2013 Loan	Jun. 30, 2012
Loans and Allowance for Loan Losses (Textual)
Principal amount outstanding of loans held-in-portfolio	$ 100,000
Impaired loans which included in groups of homogenous loans	Less than $100,000
Number of TDR's (Loan) defaulted	2
Troubled debt restructuring loan loss allowances	$ 13,000	$ 64,000

X

- Definition

Impaired loans which included in groups of homogenous loans.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Number of trouble debt restructuring defaulted.

+ References

No definition available.

+ Details

Name:	rbnf_NumberOfTroubleDebtRestrcturingDefaulted
Namespace Prefix:	rbnf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

An expense set aside as an allowance for bad loans (customer defaults, or terms of a loan have to be renegotiated.

+ References

No definition available.

+ Details

Name:	rbnf_TroubledDebtRestructuringLoanLossAllowances
Namespace Prefix:	rbnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719

+ Details

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