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Commitments and Credit Risk (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Commitments and Credit Risk (Textual)
Agricultural loans, percentage of diversified portfolio	8.00%	9.00%
Period under which company commits to sell loans at specified rates in future	45 days
Forward rate commitments to sell residential mortgage loans	$ 6.8

X

- Definition

Agricultural loans as a percentage of diversified portfolio.

+ References

No definition available.

+ Details

Name:	rbnf_AgriculturalLoansPercentageOfDiversifiedPortfolio
Namespace Prefix:	rbnf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Definition

Period under which company commits to sell loans at specified rates in future.

+ References

No definition available.

+ Details

Name:	rbnf_PeriodUnderWhichCompanyCommitsToSellLoansAtSpecifiedRates
Namespace Prefix:	rbnf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 825

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61082-112788



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 825

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61044-112788

+ Details

Name:	us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration