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Note 24 - Qualified Affordable Housing Project Investments (Details) - Original Investment in LIHTC Projects (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 24 - Qualified Affordable Housing Project Investments (Details) - Original Investment in LIHTC Projects [Line Items]    
Original Investment Value $ 5,500boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsOriginalAmount $ 5,500boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsOriginalAmount
Current Recorded Investment 4,784boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestments 5,500boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestments
Unfunded Liability Obligation 2,424boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsUnfundedLiabilityObligation 4,796boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsUnfundedLiabilityObligation
Tax Credits and Benefits 605boch_AffordableHousingTaxCreditsAndBenefitsAmount [1] 282boch_AffordableHousingTaxCreditsAndBenefitsAmount [1]
Amortization of Investments 716boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization [2] 0boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization [2]
Net Income Tax Benefit 115boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsNetIncomeTaxBenefit 53boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsNetIncomeTaxBenefit
Raymond James California Housing Opportunities Fund II [Member]    
Note 24 - Qualified Affordable Housing Project Investments (Details) - Original Investment in LIHTC Projects [Line Items]    
Original Investment Value 2,000boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsOriginalAmount
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember		 2,000boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsOriginalAmount
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember
Current Recorded Investment 1,846boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestments
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember		 2,000boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestments
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember
Unfunded Liability Obligation 736boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsUnfundedLiabilityObligation
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember		 1,858boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsUnfundedLiabilityObligation
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember
Tax Credits and Benefits 160boch_AffordableHousingTaxCreditsAndBenefitsAmount
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember		 [1] 30boch_AffordableHousingTaxCreditsAndBenefitsAmount
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember		 [1]
Amortization of Investments 154boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember		 [2] 0boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember		 [2]
Net Income Tax Benefit 31boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsNetIncomeTaxBenefit
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember		 6boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsNetIncomeTaxBenefit
/ us-gaap_InvestmentTypeAxis
= boch_RaymondJamesCaliforniaHousingOpportunitiesFundIIMember
WNC Institutional Tax Credit Fun 38, L.P. [Member]    
Note 24 - Qualified Affordable Housing Project Investments (Details) - Original Investment in LIHTC Projects [Line Items]    
Original Investment Value 1,000boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsOriginalAmount
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember		 1,000boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsOriginalAmount
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember
Current Recorded Investment 888boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestments
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember		 1,000boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestments
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember
Unfunded Liability Obligation 314boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsUnfundedLiabilityObligation
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember		 592boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsUnfundedLiabilityObligation
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember
Tax Credits and Benefits 105boch_AffordableHousingTaxCreditsAndBenefitsAmount
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember		 [1] 49boch_AffordableHousingTaxCreditsAndBenefitsAmount
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember		 [1]
Amortization of Investments 112boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember		 [2] 0boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember		 [2]
Net Income Tax Benefit 26boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsNetIncomeTaxBenefit
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember		 12boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsNetIncomeTaxBenefit
/ us-gaap_InvestmentTypeAxis
= boch_WNCInstitutionalTaxCreditFun38LPMember
Merritt Community Capital Corporation Fund XV, L.P. [Member]    
Note 24 - Qualified Affordable Housing Project Investments (Details) - Original Investment in LIHTC Projects [Line Items]    
Original Investment Value 2,500boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsOriginalAmount
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember		 2,500boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsOriginalAmount
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember
Current Recorded Investment 2,050boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestments
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember		 2,500boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestments
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember
Unfunded Liability Obligation 1,374boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsUnfundedLiabilityObligation
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember		 2,346boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsUnfundedLiabilityObligation
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember
Tax Credits and Benefits 340boch_AffordableHousingTaxCreditsAndBenefitsAmount
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember		 [1] 203boch_AffordableHousingTaxCreditsAndBenefitsAmount
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember		 [1]
Amortization of Investments 450boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember		 [2] 0boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember		 [2]
Net Income Tax Benefit $ 58boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsNetIncomeTaxBenefit
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember		 $ 35boch_ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsNetIncomeTaxBenefit
/ us-gaap_InvestmentTypeAxis
= boch_MerrittCommunityCapitalCorporationFundXVLPMember
[1] The amounts reflected in this column represent both the tax credits, as well as the tax benefits generated by the Qualified Affordable Housing Projects operating loss for the year.
[2] This amount reduces the tax credits and benefits generated by the Qualified Affordable Housing Projects.