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Available-for-Sale Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Summary of amortized cost and fair value of securities available for sale by contractual maturity
Available for Sale, Amortized Cost, Within one year	$ 861us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Available for Sale, Amortized Cost, Due after one year through five years	1,904us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Available for Sale, Amortized Cost, Due after five years through ten years	9,670us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Available for Sale, Amortized Cost, Due after ten years	20,827us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Available for Sale, Amortized Cost	33,262us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Amortized Cost, Mortgage-backed securities, money market mutual fund and equity securities	50,586rbnf_AvailableForSaleMortgageBackedSecuritiesMoneyMarketMutualFundAndEquitySecuritiesAmortizedCost
Available for Sale, Amortized Cost, Total	83,848us-gaap_AvailableForSaleSecuritiesAmortizedCost	89,679us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for Sale, Fair Value, Within one year	882us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Available for Sale, Fair Value, Due after one year through five years	2,008us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Available for Sale, Fair value, Due after five years through ten years	9,991us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Available for Sale, Fair Value, Due after ten years	21,596us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Available for Sale, Fair Value	34,477us-gaap_AvailableForSaleSecuritiesDebtSecurities
Fair Value, Mortgage-backed securities, money market mutual fund and equity securities	50,763rbnf_AvailableForSaleMortgageBackedSecuritiesMoneyMarketMutualFundAndEquitySecuritiesFairValue
Fair Value, Totals	$ 85,240us-gaap_AvailableForSaleSecurities	$ 89,793us-gaap_AvailableForSaleSecurities

X

- Definition

Available for sale Mortgage-backed securities, money market mutual fund and equity securities amortized cost.

+ References

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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