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INVESTMENT SECURITIES (Detail Textuals 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses on debt investments $ 590rivr_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestments $ 1,132rivr_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestments
Pooled Trust Preferred Issues    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in unrealized loss position 2us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
 
Below investment grade rated investments as percentage of book value of corporations investments 1.22%rivr_BelowInvestmentGradeRatedInvestmentsAsPercentageOfAggregateBookValueOfInvestments
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
 
Below investment grade rated investments as percentage of market value of Corporations investments 0.96%rivr_BelowInvestmentGradeRatedInvestmentsAsPercentageOfAggregateMarketValueOfInvestments
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
 
Pooled Trust Preferred Issues | ALESCO 9A | Moody's, Baa3 Rating    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses on debt investments 319rivr_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysBaa3RatingMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= rivr_AlescoMember
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
313rivr_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysBaa3RatingMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= rivr_AlescoMember
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Pooled Trust Preferred Issues | PRETSL XXVII | Moody's, A2 Rating    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses on debt investments $ 12rivr_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysA2RatingMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= rivr_PretslMember
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
$ 1rivr_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysA2RatingMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= rivr_PretslMember
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember