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Core Deposits and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | $ 6,422 us-gaap_FiniteLivedIntangibleAssetsGross | $ 6,301 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization | (5,764)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (5,225)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Banking intangibles [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 4,898 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember | 4,898 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember
Accumulated Amortization | (4,615)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember | (4,243)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember
Banking intangibles [Member] | Core deposits intangible [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 4,698 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember | 4,698 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember
Accumulated Amortization | (4,473)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember | (4,107)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember
Banking intangibles [Member] | Customer relationship intangible [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 200 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember | 200 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember
Accumulated Amortization | (142)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember | (136)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_BankingIntangiblesMember
Purchased software [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 1,524 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember | 1,403 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember
Accumulated Amortization | (1,149)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember | (982)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember
Purchased software [Member] | Banking [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 1,289 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember | 1,160 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember
Accumulated Amortization | (943)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember | (785)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember
Purchased software [Member] | Data processing/other [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 235 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rbnf_PurchasedSoftwareDataProcessingMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember | 243 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rbnf_PurchasedSoftwareDataProcessingMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember
Accumulated Amortization | $ (206)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rbnf_PurchasedSoftwareDataProcessingMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember | $ (197)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rbnf_PurchasedSoftwareDataProcessingMember / us-gaap_StatementBusinessSegmentsAxis = rbnf_PurchasedSoftwareMember

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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