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Securities Sold Under Repurchase Agreements (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Short-Term Borrowings (Textual)
Securities Sold Under Repurchase Agreements	$ 12,740,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase	$ 14,696,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Short-term borrowings mature	Between 2015 and 2020.
Purchases of federal funds	14,000,000us-gaap_FederalFundsPurchased	11,500,000us-gaap_FederalFundsPurchased
Federal funds line drawn upon	0us-gaap_StockRepurchasedDuringPeriodValue	0us-gaap_StockRepurchasedDuringPeriodValue
Retail Repurchase Agreements [Member]
Short-Term Borrowings (Textual)
Maximum amount of outstanding agreements at any month-end	20,600,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_DebtInstrumentAxis = rbnf_RetailRepurchaseAgreementsMember	15,000,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_DebtInstrumentAxis = rbnf_RetailRepurchaseAgreementsMember
Monthly average of such agreements totaled	$ 17,100,000us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = rbnf_RetailRepurchaseAgreementsMember	$ 12,000,000us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_DebtInstrumentAxis = rbnf_RetailRepurchaseAgreementsMember
Short-term borrowings mature	within one month.	Within one month.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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-Topic 942

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

+ References

No definition available.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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