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Income Tax - Deferred tax assets and liabilities - (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets    
Allowance for loan losses $ 1,537us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses $ 1,719us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Available-for-sale securities   1,019us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Deferred compensation 550us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 545us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Purchase accounting adjustments 378rivr_DeferredTaxAssetsPurchaseAccountingAdjustments 599rivr_DeferredTaxAssetsPurchaseAccountingAdjustments
Nonaccrual interest 28us-gaap_DeferredTaxAssetsDeferredIncome 109us-gaap_DeferredTaxAssetsDeferredIncome
Real estate held for sale 1rivr_DeferredTaxAssetsRealEstateHeldForSale 69rivr_DeferredTaxAssetsRealEstateHeldForSale
Pension and employee benefits 48rivr_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionAndEmployeeBenefits  
AMT 227us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
Other 23us-gaap_DeferredTaxAssetsOther 52us-gaap_DeferredTaxAssetsOther
Total assets 2,792us-gaap_DeferredTaxAssetsGross 4,112us-gaap_DeferredTaxAssetsGross
Liabilities    
Depreciation and amortization (944)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (585)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Loan fees (195)rivr_DeferredTaxLiabilitiesLoanFees (184)rivr_DeferredTaxLiabilitiesLoanFees
Mortgage servicing rights (224)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights (247)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights
Federal Home Loan Bank stock dividends (75)rivr_DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends (90)rivr_DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends
Prepaid expenses (665)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses (228)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Available-for-sale securities (362)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome  
Intangibles (124)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (153)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Other (4)us-gaap_DeferredTaxLiabilitiesOther (103)us-gaap_DeferredTaxLiabilitiesOther
Total liabilities (2,593)us-gaap_DeferredIncomeTaxLiabilities (1,590)us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets, net $ 199us-gaap_DeferredTaxAssetsLiabilitiesNet $ 2,522us-gaap_DeferredTaxAssetsLiabilitiesNet