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Fair Value of Assets and Liabilities (Details 1) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Impaired Loans [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 5,187	$ 2,538
Impaired Loans [Member] | Level 1 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Impaired Loans [Member] | Level 2 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Impaired Loans [Member] | Level 3 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 5,187	$ 2,538
Mortgage Servicing Rights [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 2,622	$ 3,037
Mortgage Servicing Rights [Member] | Level 1 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Mortgage Servicing Rights [Member] | Level 2 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Mortgage Servicing Rights [Member] | Level 3 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 2,622	$ 3,037

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- Definition

Fair value measurements of assets measured at fair value on a non recurring basis.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbnf_
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Period Type:	duration

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
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- Details

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X

- Details

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- Details

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X

- Details

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