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Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]    
Impaired loans, average recorded investment $ 29,204us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment $ 40,535us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Impaired loans, interest income recognized 92us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 141us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial Portfolio Segment [Member]    
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]    
Impaired loans, average recorded investment 5,363us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 6,738us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans, interest income recognized 20us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 1us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Other Receivable [Member]    
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]    
Impaired loans, average recorded investment 10,997us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 20,343us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Impaired loans, interest income recognized 32us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 107us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Residential One to Four Family [Member]    
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]    
Impaired loans, average recorded investment 12,033us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		 12,204us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember
Impaired loans, interest income recognized 33us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		 24us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember
Residential Real Estate and Home Equities [Member]    
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]    
Impaired loans, average recorded investment 776us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateAndHomeEquitiesMember		 1,250us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateAndHomeEquitiesMember
Impaired loans, interest income recognized 7us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateAndHomeEquitiesMember		 9us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateAndHomeEquitiesMember
Consumer Other Financing Receivable [Member]    
Note 6 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]    
Impaired loans, average recorded investment $ 35us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember