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Disclosures About Fair Value of Assets and Liabilities (Details) (Available-For-Sale Securities [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | $ 11,300 | $ 14,511
Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 57,223 | 63,764
State and political subdivisions [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 18,155 | 18,249
Money Market Mutual Fund [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 3,092 | 2,155
Equity securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 23 | 23
Interest Rate Contract Asset [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 257 | 254
Interest Rate Contract Liabilities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | (257) | (254)
Level 1 [Member] | U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | State and political subdivisions [Member] |  |
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] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 3,092 | 2,155
Level 1 [Member] | Equity securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Interest Rate Contract Asset [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 1 [Member] | Interest Rate Contract Liabilities [Member] |  |
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] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 11,300 | 14,511
Level 2 [Member] | Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 57,223 | 63,764
Level 2 [Member] | State and political subdivisions [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 18,155 | 18,249
Level 2 [Member] | Money Market Mutual Fund [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 2 [Member] | Equity securities [Member] |  |
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 Asset [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | 257 | 254
Level 2 [Member] | Interest Rate Contract Liabilities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring | (257) | (254)
Level 3 [Member] | U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | State and political subdivisions [Member] |  |
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] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Equity securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Interest Rate Contract Asset [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, Fair value, Recurring |  |
Level 3 [Member] | Interest Rate Contract Liabilities [Member] |  |
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

X
- 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