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Investment Securities (Detail Textuals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Carrying value securities pledged to secure public deposits and for other purposes $ 28,071,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForOtherDebtFacilities $ 22,828,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForOtherDebtFacilities
Proceeds from sales of securities available for sale 20,895,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 23,483,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gain on sales and calls of available-for-sale securities, gross 668,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 490,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Realized losses on sales and calls of available-for-sale securities 217,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 279,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Fair value of investments in debt securities $ 44,161,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue $ 76,903,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Percentage of total debts investment to company's investment portfolio 34.30%rivr_PercentageOfAggregateInvestmentSecuritiesInContinuousUnrealizedLossPosition 64.10%rivr_PercentageOfAggregateInvestmentSecuritiesInContinuousUnrealizedLossPosition