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Fair Value of Assets and Liabilities (Details) (Available-For-Sale Securities [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
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	$ 19,065	$ 11,300
Mortgage-backed securities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	55,438	57,223
State and political subdivisions [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	18,779	18,155
Money Market Mutual Funds [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring		3,092
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 Assets [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	250	257
Interest Rate Contracts Liabilities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	(250)	(257)
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
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
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
Level 1 [Member] | Money Market Mutual Funds [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring		3,092
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
Level 1 [Member] | Interest Rate Contracts Assets [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring
Level 1 [Member] | Interest Rate Contracts Liabilities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring
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	19,065	11,300
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	55,438	57,223
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	18,779	18,155
Level 2 [Member] | Money Market Mutual Funds [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring
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 Assets [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	250	257
Level 2 [Member] | Interest Rate Contracts Liabilities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring	(250)	(257)
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
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
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
Level 3 [Member] | Money Market Mutual Funds [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring
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
Level 3 [Member] | Interest Rate Contracts Assets [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring
Level 3 [Member] | Interest Rate Contracts Liabilities [Member]
Summary of fair value measurements of assets measured at fair value on a recurring basis
Assets, Fair value, Recurring

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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