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Borrowings (Detail Textuals 1) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Fed funds purchased    
Debt Instrument [Line Items]    
Overnight borrowings $ 4,155,000us-gaap_ShortTermBorrowings
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
  
Line of Credit | Bankers Bank Of Wisconsin    
Debt Instrument [Line Items]    
Overnight line of credit 5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ dei_LegalEntityAxis
= rivr_BankersBankOfWisconsinMember
 
Line of Credit | Bankers Bank Of Wisconsin | Fed funds purchased    
Debt Instrument [Line Items]    
Overnight borrowings $ 4,200,000us-gaap_ShortTermBorrowings
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ dei_LegalEntityAxis
= rivr_BankersBankOfWisconsinMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember