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Condensed Financial Information (Parent Company Only) (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2011 affiliates
Condensed Financial Information (Parent Company Only) (Textual) |  |
Number of affiliates |  | 2 rbnf_NumberOfAffiliates
Affiliates transaction amount |  | $ 0.31 us-gaap_RelatedPartyTransactionAmountsOfTransaction
Decrease in income by net amount of related party transaction | $ 0.16 rbnf_DecreaseInIncomeByNetAmountOfRelatedPartyTransaction |

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Decrease in income by net amount of related party transaction. + References No definition available. + Details
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Balance Type: | debit
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- Definition Number of affiliates. + References No definition available. + Details
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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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