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Employee Benefits (Detail Textuals 1) (USD $)
1 Months Ended 12 Months Ended
Oct. 31, 2009
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2008
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]          
Percentage of W-2 earnings for employees hired prior to September 1, 2005 and for employees hired on or after September 1, 2005   6.00%rivr_DefinedContributionPlanPercentageOfW2EarningsForSpecifiedEmployees      
Match rate as percentage of first 6% of W-2 earnings for employees hired prior to September 1, 2005         50.00%rivr_DefinedContributionPlanMatchRateAsPercentageOfFirstSixPercentOfW2EarningsForEmployeesHiredPriorToSpecifiedDate
Match rate as percentage of first 6% of W-2 earnings for employees hired on or after September 1, 2005         100.00%rivr_DefinedContributionPlanMatchRateAsPercentageOfFirstSixPercentOfW2EarningsForEmployeesHiredOnOrAfterSpecifiedDate
Changed match rate for employees hired on or after September 1, 2005 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch     75.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch  
Bank's expense for the plan   $ 86,000us-gaap_DefinedContributionPlanCostRecognized $ 78,000us-gaap_DefinedContributionPlanCostRecognized