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Loans and Allowance for Loan Losses (Details Textual)	12 Months Ended
	Dec. 31, 2015 USD ($)
Loans and Allowance for Loan Losses (Textual)
Principal amount outstanding of loans held-in-portfolio	$ 100,000
Impaired loans	Less than $100,000

X

- Definition

Impaired loans.

+ References

No definition available.

+ Details

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

X

- Definition

Loans and Allowance for Loan Losses.

+ References

No definition available.

+ 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

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