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DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Quantitative information about Level 3 fair value measurements (Unaudited) (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale - Corporate 135,120us-gaap_AvailableForSaleSecurities 128,885us-gaap_AvailableForSaleSecurities
Fair Value, Measurements, Recurring | Unobservable (Level 3) Inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale - Corporate 1,293us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring | Unobservable (Level 3) Inputs | Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 77rivr_SecuritiesReceivedOnImpairedFinancingReceivablesFairValueDisclosure
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3,357rivr_SecuritiesReceivedOnImpairedFinancingReceivablesFairValueDisclosure
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Marketability Discount 7.60%us-gaap_FairValueInputsDiscountForLackOfMarketability
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Fair Value, Measurements, Recurring | Unobservable (Level 3) Inputs | Impaired loans | Comparative sales based on independent appraisal    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation Techniques Comparative sales based on independent appraisal Comparative sales based on independent appraisal
Fair Value, Measurements, Recurring | Unobservable (Level 3) Inputs | Impaired loans | Comparative sales based on independent appraisal | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketability Discount   10.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
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Fair Value, Measurements, Recurring | Unobservable (Level 3) Inputs | Impaired loans | Comparative sales based on independent appraisal | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketability Discount   20.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
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Fair Value, Measurements, Recurring | Unobservable (Level 3) Inputs | Corporate | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale - Corporate 1,293us-gaap_AvailableForSaleSecurities
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1,322us-gaap_AvailableForSaleSecurities
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Valuation Techniques Discounted cash flows Discounted cash flows
Fair Value, Measurements, Recurring | Unobservable (Level 3) Inputs | Corporate | Discounted cash flows | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Default probability 1.80%us-gaap_FairValueInputsProbabilityOfDefault
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1.80%us-gaap_FairValueInputsProbabilityOfDefault
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Loss, given default 85.00%us-gaap_FairValueInputsLossSeverity
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85.00%us-gaap_FairValueInputsLossSeverity
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Discount rate 3.03%us-gaap_FairValueInputsDiscountRate
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3.03%us-gaap_FairValueInputsDiscountRate
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Recovery rate 10.00%rivr_FairValueInputsProbabilityOfRecoveries
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10.00%rivr_FairValueInputsProbabilityOfRecoveries
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Prepayment rate 1.00%us-gaap_FairValueInputsPrepaymentRate
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1.00%us-gaap_FairValueInputsPrepaymentRate
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Fair Value, Measurements, Recurring | Unobservable (Level 3) Inputs | Corporate | Discounted cash flows | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Default probability 75.00%us-gaap_FairValueInputsProbabilityOfDefault
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75.00%us-gaap_FairValueInputsProbabilityOfDefault
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Loss, given default 100.00%us-gaap_FairValueInputsLossSeverity
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100.00%us-gaap_FairValueInputsLossSeverity
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Discount rate 4.75%us-gaap_FairValueInputsDiscountRate
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4.75%us-gaap_FairValueInputsDiscountRate
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Recovery rate 75.00%rivr_FairValueInputsProbabilityOfRecoveries
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75.00%rivr_FairValueInputsProbabilityOfRecoveries
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Prepayment rate 2.00%us-gaap_FairValueInputsPrepaymentRate
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2.00%us-gaap_FairValueInputsPrepaymentRate
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