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

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- Definition Capitalized mortgage servicing rights Msrs. + References No definition available. + Details
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- Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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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 + Details
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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 + Details
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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 + Details
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- Details
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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 + Details
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