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Fair Value of Assets and Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Impaired loans [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 1,677	$ 2,227
Impaired loans [Member] | Level 1 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	0	0
Impaired loans [Member] | Level 2 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	0	0
Impaired loans [Member] | Level 3 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	1,677	2,227
Mortgage Servicing Rights [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	2,234	2,667
Mortgage Servicing Rights [Member] | Level 1 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	0	0
Mortgage Servicing Rights [Member] | Level 2 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	0	0
Mortgage Servicing Rights [Member] | Level 3 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	2,234	2,667
Foreclosed Assets [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	84	950
Foreclosed Assets [Member] | Level 1 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	0	0
Foreclosed Assets [Member] | Level 2 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	0	0
Foreclosed Assets [Member] | Level 3 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 84	$ 950

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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