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Disclosures About Fair Value of Assets and Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Impaired loans [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 2,227	$ 5,575
Impaired loans [Member] | Level 1 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Impaired loans [Member] | Level 2 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Impaired loans [Member] | Level 3 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	2,227	5,575
Mortgage Servicing Rights [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	3,755	2,820
Mortgage Servicing Rights [Member] | Level 1 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Mortgage Servicing Rights [Member] | Level 2 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Mortgage Servicing Rights [Member] | Level 3 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	3,755	2,820
Foreclosed Assets [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	950	877
Foreclosed Assets [Member] | Level 1 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Foreclosed Assets [Member] | Level 2 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Foreclosed Assets [Member] | Level 3 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	950	877
Impaired Software [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring		159
Impaired Software [Member] | Level 1 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Impaired Software [Member] | Level 2 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Impaired Software [Member] | Level 3 [Member]
Fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring		$ 159

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- Details

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

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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