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Mortgage Servicing Rights (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Summary of mortgage servicing rights capitalized and related amortization
Carrying amount, beginning of year	$ 5,180us-gaap_ServicingAssetAtFairValueAmount	$ 3,775us-gaap_ServicingAssetAtFairValueAmount
Mortgage servicing rights capitalized during the year	1,367rbnf_CapitalizedMortgageServicingRightsMsrs	1,603rbnf_CapitalizedMortgageServicingRightsMsrs
Mortgage servicing rights amortization during the year	(612)us-gaap_AmortizationOfMortgageServicingRightsMSRs	(827)us-gaap_AmortizationOfMortgageServicingRightsMSRs
Net change in valuation allowance	(231)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsPeriodIncreaseDecrease	629us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsPeriodIncreaseDecrease
Carrying amount, end of year	5,704us-gaap_ServicingAssetAtFairValueAmount	5,180us-gaap_ServicingAssetAtFairValueAmount
Valuation allowance:
Beginning of year	181us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	810us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Reduction	231us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsSalesAndDisposals	(629)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsSalesAndDisposals
End of year	412us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	181us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Fair Value, beginning of period	6,237us-gaap_ServicingAssetAtAmortizedValueFairValue	4,329us-gaap_ServicingAssetAtAmortizedValueFairValue
Fair Value, end of period	$ 6,358us-gaap_ServicingAssetAtAmortizedValueFairValue	$ 6,237us-gaap_ServicingAssetAtAmortizedValueFairValue

X

- Definition

Capitalized mortgage servicing rights Msrs.

+ References

No definition available.

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- Definition

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

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- Definition

Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7516967&loc=d3e66267-113978

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

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- Definition

Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

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- Definition

The net increase (decrease) in the valuation allowance for servicing assets subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

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- Definition

Reduction in valuation allowance of servicing assets based on sales and disposals.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

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