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Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended
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Jul. 03, 2014
Subsequent Event [Line Items] |
Variable rate basis, description | The new term loan will have a variable rate that is tied to the 90-day LIBOR rate.
Trust Preferred Security I [Member] |
Subsequent Event [Line Items] |
Preferred securities shares redeemed interest rate | 103.18%
Contract maturity rate | Sep. 07, 2030
Preferred securities shares redeemed amount | $ 10.0
Trust Preferred Security II [Member] |
Subsequent Event [Line Items] |
Preferred securities shares redeemed interest rate | 10.60%
Contract maturity rate | Sep. 15, 2035
Preferred securities shares redeemed amount | $ 10.3

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- Definition Contract Maturity Rate. + References No definition available. + Details
Name: | rbnf_ContractMaturityRate
Namespace Prefix: | rbnf_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Preferred securities shares redeemed amount. + References No definition available. + Details
Name: | rbnf_PreferredSecuritiesSharesRedeemedAmount
Namespace Prefix: | rbnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Preferred Securities Shares Redeemed Interest Rate. + References No definition available. + Details
Name: | rbnf_PreferredSecuritiesSharesRedeemedInterestRate
Namespace Prefix: | rbnf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration