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Employee Benefits (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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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 | $ 0.4 us-gaap_DefinedContributionPlanAdministrativeExpenses | $ 0.4 us-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 | 0.1 rbnf_ChargesToExpenseForSerpAgreements | 0.1 rbnf_ChargesToExpenseForSerpAgreements
Cash surrender value of all life insurance policies | 13.1 us-gaap_CashSurrenderValueOfLifeInsurance | 12.9 us-gaap_CashSurrenderValueOfLifeInsurance
Vesting period of company's contribution to each employee account | 3 years |
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares | 464,377 us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares | 447,322 us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares
Employee Stock Ownership Plan (ESOP), Compensation Expense | $ 0 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | $ 0.3 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense

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- Definition Supplemental Executive Retirement Plan agreements charges to expense. + References No definition available. + Details
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- Definition Description of Supplemental Executive Retirement Plan (SERP) agreement. + References No definition available. + Details
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- Details
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- Definition Vesting period of company's matching contribution of employment. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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- Definition Amount of administrative expenses incurred by a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Definition The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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