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Deposits - Information regarding various deposits (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deposits [Abstract]    
Demand deposits $ 224,772us-gaap_DemandDepositAccounts $ 201,638us-gaap_DemandDepositAccounts
Savings deposits 58,700us-gaap_DepositsSavingsDeposits 56,363us-gaap_DepositsSavingsDeposits
Certificates and other time deposits of $100,000 or more 53,346us-gaap_TimeDeposits100000OrMore 66,059us-gaap_TimeDeposits100000OrMore
Other certificates and time deposits 60,265rivr_OtherCertificatesAndTimeDeposits 70,955rivr_OtherCertificatesAndTimeDeposits
Total deposits $ 397,083us-gaap_Deposits $ 395,015us-gaap_Deposits