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Loans and Allowance for Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013 Contract
Summary of troubled debt restructurings modified in the past 12 months that subsequently defaulted
Number of Contracts	4
Recorded Balance	$ 194
Residential Real Estate [Member]
Summary of troubled debt restructurings modified in the past 12 months that subsequently defaulted
Number of Contracts	4
Recorded Balance	194
Consumer [Member]
Summary of troubled debt restructurings modified in the past 12 months that subsequently defaulted
Recorded Balance

X

- Details

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Namespace Prefix:	rbnf_
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- Definition

Number of financing receivables that have been 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=28368275&loc=SL6953676-111524

+ Details

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- 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=28368275&loc=SL6953676-111524

+ Details

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