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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Total nonaccruing loans	$ 5,249	$ 6,900
Accruing Troubled Debt Restructures (TDR's)	1,735	1,334
Total Nonperforming Loans	6,984	8,234
Commercial [Member]
Total nonaccruing loans	1,362	2,393
Commercial Real Estate [Member]
Total nonaccruing loans	448	1,456
Agricultural [Member]
Total nonaccruing loans	3	0
Residential Real Estate [Member]
Total nonaccruing loans	2,607	2,471
Home Equity & Consumer [Member]
Total nonaccruing loans	829	580
Leasing [Member]
Total nonaccruing loans	$ 0	$ 0

X

- Definition

Carrying amount related to accruing troubled debt restructurings by class of financing receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A nonperforming loan that is not generating the stated interest rate because of nonpayment from the borrower, typically due to financial difficulties. Nonaccrual loans are more likely to default, meaning that the investor will not recoup their principal.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A sum of borrowed money upon which the debtor has not made their scheduled payments. A nonperforming loan is either in default or close to being in default.

+ References

No definition available.

+ Details

Name:	rbnf_NonperformingLoansReceivableNet
Namespace Prefix:	rbnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant