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Core Deposits and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount $ 6,422us-gaap_FiniteLivedIntangibleAssetsGross $ 6,301us-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 4,898us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_StatementBusinessSegmentsAxis
= rbnf_BankingIntangiblesMember
4,898us-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 4,698us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
/ us-gaap_StatementBusinessSegmentsAxis
= rbnf_BankingIntangiblesMember
4,698us-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 200us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_StatementBusinessSegmentsAxis
= rbnf_BankingIntangiblesMember
200us-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 1,524us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_StatementBusinessSegmentsAxis
= rbnf_PurchasedSoftwareMember
1,403us-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 1,289us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
/ us-gaap_StatementBusinessSegmentsAxis
= rbnf_PurchasedSoftwareMember
1,160us-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 235us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= rbnf_PurchasedSoftwareDataProcessingMember
/ us-gaap_StatementBusinessSegmentsAxis
= rbnf_PurchasedSoftwareMember
243us-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