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Loans and Allowance for Loan Losses (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Loans and Allowance for Loan Losses (Textual)
Principal amount outstanding of loans held-in-portfolio	$ 100us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio
Impaired loans which included in groups of homogenous loans	Impaired loans less than $100,000 are included in groups of homogenous loans.

X

- Definition

Impaired loans which included in groups of homogenous loans.

+ References

No definition available.

+ Details

Name:	rbnf_ImpairedLoansWhichIncludedInGroupsOfHomogenousLoans
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

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 (a)

-URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107314-111719

+ Details

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