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Commitments and Credit Risk (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Commitments and Credit Risk (Textual) |  |
Agricultural loans, percentage of diversified portfolio | 9.00% | 9.00%
Period under which company commits to sell loans at specified rates in future | 45 days |
Forward rate commitments to sell residential mortgage loans | $ 13.0 |

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- Definition Agricultural loans as a percentage of diversified portfolio. + References No definition available. + Details
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Namespace Prefix: | rbnf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Definition Period under which company commits to sell loans at specified rates in future. + References No definition available. + Details
Name: | rbnf_PeriodUnderWhichCompanyCommitsToSellLoansAtSpecifiedRates
Namespace Prefix: | rbnf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61082-112788 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph m -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61044-112788 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration