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Accounting for Certain Loans Acquired in Transfer (Detail Textuals) (Loans Receivable, USD $)
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Loans acquired with a deteriorated credit quality $ 190,000us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality $ 264,000us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
Dupont State Bank    
Business Acquisition [Line Items]    
Loans acquired with a deteriorated credit quality   264,000us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
Decrease in allowance for credit losses acquired with deteriorated credit quality $ 74,000rivr_DecreaseInAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember