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INVESTMENT SECURITIES (Detail Textuals) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]      
Carrying value securities pledged to secure public deposits and for other purposes $ 24,803,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForOtherDebtFacilities   $ 28,071,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForOtherDebtFacilities
Proceeds from sales of securities available-for-sale 2,841,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 8,264,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Gain on sales and calls of available-for-sale securities, gross 93,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 279,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains  
Realized losses on sales and calls of available-for-sale securities    192,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses  
Fair value of investments in debt securities $ 32,928,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue   $ 44,161,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Percentage of total debts investment to corporation's investment portfolio 24.40%rivr_PercentageOfAggregateInvestmentSecuritiesInContinuousUnrealizedLossPosition   34.30%rivr_PercentageOfAggregateInvestmentSecuritiesInContinuousUnrealizedLossPosition