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INVESTMENT SECURITIES (Details 3) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
INVESTMENT SECURITIES    
Sales of available for sale securities $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Calls of available for sale securities $ 0rbcaa_AvailableForSaleSecuritiesCallProceeds $ 0rbcaa_AvailableForSaleSecuritiesCallProceeds