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Restriction on Cash and Due From Banks (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Restriction on cash and due from banks (Textual) |
Reserve funds in cash deposit with the Federal Reserve Bank | $ 0.7 us-gaap_CashReserveDepositRequiredAndMade

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- Details
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Namespace Prefix: | rbnf_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 305 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792 + Details
Name: | us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant