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Securities (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Securities (Textual)
Fair value of securities pledged as collateral, to secure public deposits and for other purposes	$ 58.0us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	$ 44.5us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
Fair value of securities delivered for repurchase agreements	18.9us-gaap_SecuritiesForReverseRepurchaseAgreements	16.5us-gaap_SecuritiesForReverseRepurchaseAgreements
Total fair value	11.2us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	29.0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Fair value as a percentage of available-for-sale investment portfolio	12.20%rbnf_AvailableForSaleSecuritiesInvestmentPercentage	34.70%rbnf_AvailableForSaleSecuritiesInvestmentPercentage
Gross Unrealized Losses	$ 0.14us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss	$ 0.29us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss

X

- Definition

Percentage of investment in available for sale securities.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

+ Details

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

X

- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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X

- Definition

The sum of the fair values, as of the date of each statement of financial position presented, of securities that are restricted as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(m)(2)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Balance Type:	debit
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