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Condensed Financial Information (Parent Company Only) (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Expenses
Interest expense	$ 3,480us-gaap_InterestExpense	$ 4,035us-gaap_InterestExpense
Income tax benefit	2,085us-gaap_IncomeTaxExpenseBenefit	2,243us-gaap_IncomeTaxExpenseBenefit
Equity in undistributed income of subsidiaries
Net Income	5,263us-gaap_NetIncomeLoss	5,205us-gaap_NetIncomeLoss
Comprehensive income	6,107us-gaap_ComprehensiveIncomeNetOfTax	3,449us-gaap_ComprehensiveIncomeNetOfTax
Parent [Member]
Dividends from subsidiaries:
Banking subsidiaries	5,000rbnf_DividendFromBankingSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	4,000rbnf_DividendFromBankingSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Nonbanking subsidiaries	39rbnf_DividendFromNonBankingSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	186rbnf_DividendFromNonBankingSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Total	5,039rbnf_DividendsFromSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	4,186rbnf_DividendsFromSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Other income		21us-gaap_OtherIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Total income	5,039us-gaap_OperatingIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	4,207us-gaap_OperatingIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Expenses
Interest expense	1,138us-gaap_InterestExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	1,407us-gaap_InterestExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Other expense	1,201us-gaap_InterestExpenseOther / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	938us-gaap_InterestExpenseOther / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Total expenses	2,339us-gaap_OperatingExpenses / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	2,345us-gaap_OperatingExpenses / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Income before income tax and equity in undistributed income of subsidiaries	2,700us-gaap_IncomeLossFromSubsidiariesBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	1,862us-gaap_IncomeLossFromSubsidiariesBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Income tax benefit	(803)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	(790)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Income before equity in undistributed income of subsidiaries	3,503rbnf_IncomeLossBeforeEquityInUndistributedExcessDistributedIncomeLossOfSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	2,652rbnf_IncomeLossBeforeEquityInUndistributedExcessDistributedIncomeLossOfSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Equity in undistributed income of subsidiaries
Banking subsidiaries	1,952rbnf_EquityInUndistributedBankingSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	3,081rbnf_EquityInUndistributedBankingSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Nonbanking subsidiaries	(192)rbnf_EquityInUndistributedNonbankingSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	(364)rbnf_EquityInUndistributedNonbankingSubsidiaries / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Total	1,760rbnf_EquityInUndistributedExcessDistributedIncomeLossOfSubsidiariesNet / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	2,717rbnf_EquityInUndistributedExcessDistributedIncomeLossOfSubsidiariesNet / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Net Income	5,263us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	5,369us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Comprehensive income	$ 6,107us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	$ 3,449us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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