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Note 4 - Securities (Details) - Fair Market Value of Securities Segregated by Purpose (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Financial Instruments Owned and Pledged as Collateral [Line Items]  
Pledged securities $ 50,241us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
Public Funds Collateral [Member]  
Financial Instruments Owned and Pledged as Collateral [Line Items]  
Pledged securities 24,655us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_OtherCommitmentsAxis
= boch_PublicFundsCollateralMember
Federal Home Loan Bank Borrowings [Member]  
Financial Instruments Owned and Pledged as Collateral [Line Items]  
Pledged securities 22,053us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
Interest Rate Swap [Member]  
Financial Instruments Owned and Pledged as Collateral [Line Items]  
Pledged securities $ 3,533us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember