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Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans $ 18,513us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 21,649us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Commercial Portfolio Segment [Member]    
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans 3,908us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 5,112us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Other Receivable [Member]    
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans 8,182us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 9,696us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Residential One to Four Family [Member]    
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans 6,365us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		 6,782us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember
Residential Real Estate and Home Equities [Member]    
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans 24us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateAndHomeEquitiesMember		 24us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateAndHomeEquitiesMember
Consumer Other Financing Receivable [Member]    
Note 6 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans $ 34us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		 $ 35us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember