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Fair Value of Assets and Liabilities (Details) (Available-For-Sale Securities [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
U.S. Treasury and Government Agencies [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	$ 16,077	$ 14,511
Mortgage-backed securities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	56,722	63,764
State and political subdivisions [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	19,522	18,249
Money Market Mutual Fund [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	3,035	2,155
Equity securities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	23	23
Interest rate contracts [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	104	254
Level 1 [Member] | U.S. Treasury and Government Agencies [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 1 [Member] | Mortgage-backed securities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 1 [Member] | State and political subdivisions [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 1 [Member] | Money Market Mutual Fund [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	3,035	2,155
Level 1 [Member] | Equity securities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 1 [Member] | Interest rate contracts [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 2 [Member] | U.S. Treasury and Government Agencies [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	16,077	14,511
Level 2 [Member] | Mortgage-backed securities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	56,722	63,764
Level 2 [Member] | State and political subdivisions [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	19,522	18,249
Level 2 [Member] | Money Market Mutual Fund [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 2 [Member] | Equity securities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	23	23
Level 2 [Member] | Interest rate contracts [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	104	254
Level 3 [Member] | U.S. Treasury and Government Agencies [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 3 [Member] | Mortgage-backed securities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 3 [Member] | State and political subdivisions [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 3 [Member] | Money Market Mutual Fund [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 3 [Member] | Equity securities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	0	0
Level 3 [Member] | Interest rate contracts [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	$ 0	$ 0

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- Details

Name:	rbnf_FairValueMeasurementsOfSecuritiesMeasuredAtFairValueOnRecurringBasisAbstract
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 recurring 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_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant