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Commitments and Credit Risk (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Commitments and Credit Risk (Textual) |  |
Agricultural loans, percentage of diversified portfolio | 8.00% | 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 | $ 6.8 |

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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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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
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Namespace Prefix: | rbnf_
Data Type: | xbrli:durationItemType
Balance Type: | na
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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 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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration