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Employee Benefits (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Employee Benefits (Textual)    
Maximum employee contribution of compensation received 4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent  
Employer Matching Contribution, Percent 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent  
Vesting period of matching contribution 3 years  
Amount of Employer contributions charged to expense $ 0.4us-gaap_DefinedContributionPlanAdministrativeExpenses $ 0.4us-gaap_DefinedContributionPlanAdministrativeExpenses
Description of Supplemental Executive Retirement Plan agreement with certain active and retired officers Agreements provide monthly payments for up to 15 years that equal 15 percent to 25 percent of average compensation prior to retirement or death.  
Expense charged under Supplemental Executive Retirement Plan agreements 0.1rbnf_ChargesToExpenseForSerpAgreements 0.1rbnf_ChargesToExpenseForSerpAgreements
Cash surrender value of all life insurance policies 13.1us-gaap_CashSurrenderValueOfLifeInsurance 12.9us-gaap_CashSurrenderValueOfLifeInsurance
Vesting period of company's contribution to each employee account 3 years  
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares 464,377us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares 447,322us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares
Employee Stock Ownership Plan (ESOP), Compensation Expense $ 0us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense $ 0.3us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense