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Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans $ 21,649us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 29,796us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Commercial Portfolio Segment [Member]    
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans 5,112us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 6,527us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Other Receivable [Member]    
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans 9,696us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 14,539us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Residential One To Four Family [Member]    
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans 6,782us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		 8,217us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember
Residential Real Estate and Home Equities [Member]    
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans 24us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateandHomeEquitiesMember		 513us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateandHomeEquitiesMember
Consumer Other Financing Receivable [Member]    
Note 5 - Loans (Details) - Nonaccrual Loans, Segregated by Loan Class [Line Items]    
Nonaccrual loans $ 35us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember