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FAIR VALUE OF ASSETS AND LIABILITIES (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Foreclosed assets (Member)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 1,122	$ 1,122
Fair Value Measurements, Valuation Techniques	Market comparable properties	Market comparable properties
Foreclosed assets (Member) | Comparability Adjustments Percent [Member]
Fair Value Measurements Unobservable Input Description	Comparability adjustments (%)	Comparability adjustments (%)
Fair Value Input Interest Rate	0.00%	0.00%
Collateral Dependent Impaired Loans [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	5,046	5,046
Fair Value Measurements, Valuation Techniques	Market comparable properties	Market comparable properties
Collateral Dependent Impaired Loans [Member] | Marketability Discount [Member]
Fair Value Measurements Unobservable Input Description	Marketability discount	Marketability discount
Fair Value Input Interest Rate	10.00%	10.00%
Mortgage Servicing Rights [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 3,359	$ 3,359	$ 3,359
Fair Value Measurements, Valuation Techniques	Discounted cash flow	Discounted cash flow
Mortgage Servicing Rights [Member] | Discount Rate [Member]
Fair Value Measurements Unobservable Input Description	Discount Rate	Discount Rate
Fair Value Input Interest Rate	8.50%	8.50%
Mortgage Servicing Rights [Member] | Constant Prepayment Rate [Member]
Fair Value Measurements Unobservable Input Description	Constant prepayment rate	Constant prepayment rate
Fair Value Input Interest Rate	16.60%	17.90%
Mortgage Servicing Rights [Member] | P and I Earnings Credit [Member]
Fair Value Measurements Unobservable Input Description	P&I earnings credit	P&I earnings credit
Fair Value Input Interest Rate	0.24%	0.25%
Mortgage Servicing Rights [Member] | Inflation For Cost Of Servicing [Member]
Fair Value Measurements Unobservable Input Description	Inflation for cost of servicing	Inflation for cost of servicing
Fair Value Input Interest Rate	1.50%	1.50%
Mortgage Servicing Rights [Member] | T and I Earnings Credit [Member]
Fair Value Measurements Unobservable Input Description	T&I earnings credit	T&I earnings credit
Fair Value Input Interest Rate	1.20%	1.10%

X

- Definition

Reflects the interest rate percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbnf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Description of the unobservable inputs used in the valuation of investment assets by the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbnf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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Namespace Prefix:	us-gaap_
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X

- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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