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Note 22 - Fair Values (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 22 - Fair Values (Details) [Line Items]    
Fair Value Inputs, Discount Rate 10.00%us-gaap_FairValueInputsDiscountRate  
Future Cash Flows Discounted 6.19%boch_FutureCashFlowsDiscounted  
Carrying Value Of Loans Fully Charged Off $ 0boch_CarryingValueOfLoansFullyChargedOff  
Obligations of States and Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]    
Note 22 - Fair Values (Details) [Line Items]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3   1,100,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= boch_ObligationsOfStatesAndPoliticalSubdivisionsMember
Obligations of States and Political Subdivisions [Member]    
Note 22 - Fair Values (Details) [Line Items]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3   (1,131,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= boch_ObligationsOfStatesAndPoliticalSubdivisionsMember
Non Agency Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Note 22 - Fair Values (Details) [Line Items]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3   13,000,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= boch_NonAgencyMortgageBackedSecuritiesMember
Collateral Impaired Loans [Member]    
Note 22 - Fair Values (Details) [Line Items]    
Collateral Dependent Impaired Loans Carrying Amount 12,500,000boch_CollateralDependentImpairedLoansCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= boch_CollateralImpairedLoansMember		  
Fair Value Written Down 10,300,000boch_FairValueWrittenDown
/ us-gaap_FinancialInstrumentAxis
= boch_CollateralImpairedLoansMember		  
Allowance for Loan and Lease Losses, Adjustments, Net $ 2,200,000us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
/ us-gaap_FinancialInstrumentAxis
= boch_CollateralImpairedLoansMember