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Leases (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Leases (Textual)
Operating leases expiration period for State Bank and Trust Company and RDSI Banking Systems	Over the next ten years.
Lease renewal options for period	5 years
Rental expense of operating lease	$ 0.46	$ 0.44

X

- Definition

Lease renewal options period.

+ References

No definition available.

+ Details

Name:	rbnf_LeaseRenewalOptionsPeriod
Namespace Prefix:	rbnf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Operating leases for business use expiration period.

+ References

No definition available.

+ Details

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

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

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