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LOANS AND ALLOWANCE (Detail Textuals) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Loan
Mar. 31, 2014
Loan
Dec. 31, 2014
Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income recognized on a cash basis $ 65us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod $ 74us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod  
Loans Receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 90 days or more and accruing     28us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
Number Of Loans     4rivr_NumberOfLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
Interest income recognized on a cash basis 106us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
114us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
 
Total amount of loan identified as troubled debt restructured 6,819us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
9,730us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
 
Number of troubled debt restructuring 29rivr_FinancingReceivableNumberOfContracts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
35rivr_FinancingReceivableNumberOfContracts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
 
Loans Receivable | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 90 days or more and accruing     1,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Interest income recognized on a cash basis 7us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
1us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
 
Loans Receivable | One-to-four family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 90 days or more and accruing     25us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_OneToFourFamilyResidentialRealEstateMember
Number Of Loans     1rivr_NumberOfLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_OneToFourFamilyResidentialRealEstateMember
Interest income recognized on a cash basis 30us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_OneToFourFamilyResidentialRealEstateMember
47us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_OneToFourFamilyResidentialRealEstateMember
 
Loans Receivable | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 90 days or more and accruing 9us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_ConsumerAndOtherPortfolioSegmentMember
  2us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_ConsumerAndOtherPortfolioSegmentMember
Number Of Loans     2rivr_NumberOfLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_ConsumerAndOtherPortfolioSegmentMember
Loans Receivable | Non-performing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total amount of loan identified as troubled debt restructured 4,700us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
   
Loans Receivable | Performing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total amount of loan identified as troubled debt restructured $ 2,100us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember