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Loans and Allowance for Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Contract	Mar. 31, 2013 Contract
Summary of troubled debt restructurings modified in the past 12 months that subsequently defaulted
Number of Contracts	3	2
Recorded Balance	$ 62	$ 19
Residential Real Estate [Member]
Summary of troubled debt restructurings modified in the past 12 months that subsequently defaulted
Number of Contracts	3	2
Recorded Balance	62	19
Home Equity & Consumer [Member]
Summary of troubled debt restructurings modified in the past 12 months that subsequently defaulted
Number of Contracts
Recorded Balance
Consumer & Other [Member]
Summary of troubled debt restructurings modified in the past 12 months that subsequently defaulted
Number of Contracts
Recorded Balance

X

- Details

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

- 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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Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the outstanding recorded investment related to 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 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

+ Details

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