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Trust Preferred Securities (Details) (USD $)
1 Months Ended 3 Months Ended 1 Months Ended
Sep. 30, 2000
Sep. 30, 2014
Sep. 30, 2005
Dec. 31, 2013
Dec. 31, 2014
Rurban Statutory Trust (RST I) [Member]          
Trust Preferred Securities (Textual)          
Capital Securities 10,000rbnf_NumberOfCapitalSecuritiesIssuedThroughPrivateOffering
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustOneMember
       
Liquidation amount per security $ 1,000rbnf_LiquidationAmountOfEachCapitalSecuritiesIssuedThroughPrivateOffering
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustOneMember
       
Outstanding principal balance       10,000,000us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustOneMember
 
Maturity Date Sep. 07, 2030        
Prepayment penalties before tax   430,000rbnf_RedemptionOnPrepaymentPenaltiesBeforeTax
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustOneMember
     
Prepayment penalties after tax   280,000rbnf_RedemptionOnPrepaymentPenaltiesAfterTax
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustOneMember
     
Other operating expense   330,000us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustOneMember
     
Interest expense   100,000us-gaap_InterestExpenseJuniorSubordinatedDebentures
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustOneMember
     
Rurban Statutory Trust (RST II) [Member]          
Trust Preferred Securities (Textual)          
Capital Securities     10,000rbnf_NumberOfCapitalSecuritiesIssuedThroughPrivateOffering
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustTwoMember
   
Liquidation amount per security     1,000rbnf_LiquidationAmountOfEachCapitalSecuritiesIssuedThroughPrivateOffering
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustTwoMember
   
Secured note payable description of LIBOR rate plus     Interest rate that changes quarterly and is based on the 3-month LIBOR plus 180 basis points.    
Outstanding principal balance       $ 10,000,000us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustTwoMember
$ 10,000,000us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustTwoMember
Interest rate       2.08%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustTwoMember
2.06%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= rbnf_RurbanStatutoryTrustTwoMember