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Loans and Allowance for Loan Losses (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013 Loan
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
Residential real estate loan defaulted balance	$ 190,000

X

- Definition

Impaired loans which included in groups of homogenous loans.

+ References

No definition available.

+ Details

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- Details

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Namespace Prefix:	rbnf_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Number of trouble debt restrcturing defaulted.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbnf_
Data Type:	xbrli:integerItemType
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X

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524

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Balance Type:	debit
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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4 and FIN46(R)-8

-Paragraph B11

-Subparagraph b

-Clause 6

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph i

-Subclause a

-Clause 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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