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Share Based Compensation Plan (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Plan (Textual)
Option awards vesting period	3 years
Options granted
2008 Stock Incentive Plan [Member]
Share Based Compensation Plan (Textual)
Maximum common shares granted for incentive stock options, nonqualified stock options, stock appreciation rights ("SARs"), and restricted stock	250,000rbnf_MaximumNumberOfCommonSharePermitsUnderStockIncentivePlan / us-gaap_AwardTypeAxis = rbnf_StockCompensationPlanOneMember
Compensation cost charged against income	0.04us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = rbnf_StockCompensationPlanOneMember	0.05us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = rbnf_StockCompensationPlanOneMember
Total unrecognized compensation cost related to non-vested share-based compensation arrangements granted under plan	0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = rbnf_StockCompensationPlanOneMember
Unrecognized compensation cost expected to recognized over weighted-average period	1 month 17 days
Option awards vesting period	5 years
Option awards contractual terms	10 years
Total income tax benefit recognized in income statement for share-based compensation arrangements	0.01us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = rbnf_StockCompensationPlanOneMember	0.02us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = rbnf_StockCompensationPlanOneMember
Restricted Stock [Member]
Share Based Compensation Plan (Textual)
Compensation cost charged against income	0.05us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	0.02us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Total unrecognized compensation cost related to non-vested share-based compensation arrangements granted under plan	0.14us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Option awards vesting period	4 years
Total income tax benefit recognized in income statement for share-based compensation arrangements	0.02us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	0.01us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
weighted-average period term	2 years 10 months 2 days

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- Definition

Maximum common shares granted for incentive stock options, nonqualified stock options, stock appreciation rights and restricted stock.

+ References

No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Remaining weighted average contract period of financial guarantee insurance contracts, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Net number of share options (or share units) granted during the period.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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