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Fair Value of Assets and Liabilities (Details) (Available-For-Sale Securities [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
U.S. Treasury and Government Agencies [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | $ 16,795 | $ 14,511
Mortgage-backed securities [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 60,709 | 63,764
State and political [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 17,986 | 18,249
Money Market Mutual Fund [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 2,877 | 2,155
Equity securities [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 23 | 23
Interest Rate Contract [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 205 | 254
Level 1 [Member] | U.S. Treasury and Government Agencies [Member] |  |
Summary of fair value measurements of securities 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 securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | State and political [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Money Market Mutual Fund [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 2,877 | 2,155
Level 1 [Member] | Equity securities [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Interest Rate Contract [Member] |  |
Summary of fair value measurements of securities 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 securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 16,795 | 14,511
Level 2 [Member] | Mortgage-backed securities [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 60,709 | 63,764
Level 2 [Member] | State and political [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 17,986 | 18,249
Level 2 [Member] | Money Market Mutual Fund [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 2 [Member] | Equity securities [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 23 | 23
Level 2 [Member] | Interest Rate Contract [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 205 | 254
Level 3 [Member] | U.S. Treasury and Government Agencies [Member] |  |
Summary of fair value measurements of securities 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 securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | State and political [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Money Market Mutual Fund [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Equity securities [Member] |  |
Summary of fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Interest Rate Contract [Member] |  |
Summary of fair value measurements of securities 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