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Available-for-Sale Securities (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Available-for-Sale Securities (Textual) |  |
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value | $ 44,500,000 us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue | $ 42,300,000 us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
Securities for Reverse Repurchase Agreements | 16,500,000 us-gaap_SecuritiesForReverseRepurchaseAgreements | 17,500,000 us-gaap_SecuritiesForReverseRepurchaseAgreements
Available-for-sale Securities, Gross Realized Gains | 170,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 90,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Available-for-sale Securities, Gross Realized Losses | 10,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | 40,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Net gain on sales of securities | 160,000 us-gaap_GainLossOnSaleOfSecuritiesNet | 48,000 us-gaap_GainLossOnSaleOfSecuritiesNet
Tax expense for net security gains | 50,000 rbnf_TaxExpenseForNetSecurityGainsLosses | 20,000 rbnf_TaxExpenseForNetSecurityGainsLosses
Total fair value of investments | $ 28,951,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | $ 35,808,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Fair value as a percentage of available-for-sale investment portfolio | 34.00%rbnf_AvailableForSaleSecuritiesInvestmentPercentage | 40.00%rbnf_AvailableForSaleSecuritiesInvestmentPercentage

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- Definition Percentage of investment in available for sale securities. + References No definition available. + Details
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- Details
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- Definition Tax expense for net security gains (losses) + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Article 7 + Details
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- Definition The sum of the fair values, as of the date of each statement of financial position presented, of securities that are restricted as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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- Definition The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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