Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Loans
Taxable	$ 5,619rbnf_InterestIncomeLoanTaxable	$ 5,241rbnf_InterestIncomeLoanTaxable
Nontaxable	6rbnf_InterestIncomeLoanTaxExempt	16rbnf_InterestIncomeLoanTaxExempt
Securities
Taxable	372us-gaap_InterestIncomeSecuritiesTaxable	309us-gaap_InterestIncomeSecuritiesTaxable
Nontaxable	177	175
Total interest income	6,174	5,741
Interest expense
Deposits	495us-gaap_InterestExpenseDeposits	498us-gaap_InterestExpenseDeposits
Repurchase Agreements & Other	5	11
Federal Home Loan Bank advances	92	74
Trust preferred securities	51	333
Total interest expense	643us-gaap_InterestExpense	916us-gaap_InterestExpense
Net interest income	5,531us-gaap_InterestIncomeExpenseNet	4,825us-gaap_InterestIncomeExpenseNet
Provision for loan losses	350us-gaap_ProvisionForLoanLossesExpensed
Net interest income after provision for loan losses	5,181	4,825
Noninterest income
Wealth Management Fees	659us-gaap_ManagementFeesRevenue	632us-gaap_ManagementFeesRevenue
Customer service fees	632	610
Gain on sale of mtg. loans & OMSR's	1,400us-gaap_GainLossOnSaleOfMortgageLoans	572us-gaap_GainLossOnSaleOfMortgageLoans
Mortgage loan servicing fees, net	58us-gaap_ServicingFeesNet	245us-gaap_ServicingFeesNet
Gain on sale of non-mortgage loans	254us-gaap_GainLossOnSalesOfConsumerLoans	23us-gaap_GainLossOnSalesOfConsumerLoans
Data service fees	317us-gaap_FeesAndCommissionsOther	306us-gaap_FeesAndCommissionsOther
Loss on sale/disposal of assets	(19)us-gaap_GainLossOnDispositionOfAssets1	(34)us-gaap_GainLossOnDispositionOfAssets1
Other income	295	205
Total non-interest income	3,596us-gaap_NoninterestIncome	2,559us-gaap_NoninterestIncome
Noninterest expense
Salaries and employee benefits	3,477us-gaap_SalariesAndWages	3,120us-gaap_SalariesAndWages
Net occupancy expense	503us-gaap_OccupancyNet	573us-gaap_OccupancyNet
Equipment expense	565us-gaap_EquipmentExpense	639us-gaap_EquipmentExpense
Data processing fees	263	211
Professional fees	440us-gaap_ProfessionalFees	338us-gaap_ProfessionalFees
Marketing expense	149us-gaap_MarketingExpense	123us-gaap_MarketingExpense
Telephone and communication	90us-gaap_Communication	112us-gaap_Communication
Postage and delivery expense	234us-gaap_PostageExpense	204us-gaap_PostageExpense
State, local and other taxes	129	92
Employee expense	153us-gaap_OtherLaborRelatedExpenses	115us-gaap_OtherLaborRelatedExpenses
Intangible amortization expense	54us-gaap_AmortizationOfIntangibleAssets	131us-gaap_AmortizationOfIntangibleAssets
Other expenses	587us-gaap_OtherNoninterestExpense	421us-gaap_OtherNoninterestExpense
Total non-interest expense	6,644us-gaap_NoninterestExpense	6,079us-gaap_NoninterestExpense
Income before income tax expense	2,133	1,306
Income tax expense	637us-gaap_IncomeTaxExpenseBenefit	326us-gaap_IncomeTaxExpenseBenefit
Net income	1,496us-gaap_NetIncomeLoss	980us-gaap_NetIncomeLoss
Preferred Stock Dividends	225
Net income available to common shareholders	$ 1,271	$ 980
Common share data:
Basic earnings per common share	$ 0.26us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic
Diluted earnings per common share	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted
Average common shares outstanding ( in thousands):
Basic:	4,879	4,871
Diluted:	6,379	4,894

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

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Fee and commission revenue earned from sources not otherwise specified in the existing taxonomy.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The gains (losses) included in earning that represent the difference between the sale price and the carrying value of consumer loans. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Aggregate amount of interest expense on all deposits.

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Interest expense incurred during the reporting period on short-term borrowings associated with Federal Home Loan Bank and Federal Reserve Bank advances.

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Gross expenses on securities sold coupled with an agreement to repurchase the same from the same counterparty at a fixed or determinable price within a fixed or variable time period.

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The amount of interest incurred to a trust which has issued trust-preferred securities. In order to issue trust preferred securities, a sponsor forms a trust by investing a nominal amount of cash to purchase all of the voting common stock of the trust. The trust issues nonvoting, mandatorily redeemable preferred securities to outside investors in exchange for cash. The proceeds received from the issuance of the preferred securities, together with the cash received for issuing the common stock to the sponsor, is then loaned to the sponsor in exchange for a note which has the same terms as the trust preferred securities. Trust preferred securities possesses characteristics of both equity and debt issues and are generally issued by bank holding companies.

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Represents other forms of revenue earned, excluding interest, which is not otherwise specified in the taxonomy.

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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

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Amount of payroll tax expense, compensation, postemployment and benefit-related expenses not elsewhere specified in the taxonomy (such as health plan, profit sharing, incentives, tuition reimbursement, other fringe benefits and perquisites) incurred in the period.

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Other noninterest expenses that are not separately presented in any other noninterest expense category.

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Amount of expense associated with postage.

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The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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No definition available.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Amount of expense related to loss from loan transactions.

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Expenditures for salaries other than officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

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Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees.

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All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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