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Note 6 - Loans (Details) - Newly Restructured Loans and Types of Modifications (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Note 6 - Loans (Details) - Newly Restructured Loans and Types of Modifications [Line Items]    
Payment Deferral $ 1,061boch_FinancingReceivablePaymentDeferralModification  
Modifications 1,061boch_FinancingReceivableModifications 695boch_FinancingReceivableModifications
Rate & Maturity   695boch_FinancingReceivableRateAndMaturityModifications
Commercial Portfolio Segment [Member]    
Note 6 - Loans (Details) - Newly Restructured Loans and Types of Modifications [Line Items]    
Payment Deferral 787boch_FinancingReceivablePaymentDeferralModification
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Modifications 787boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 695boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Rate & Maturity   695boch_FinancingReceivableRateAndMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Residential One to Four Family [Member]    
Note 6 - Loans (Details) - Newly Restructured Loans and Types of Modifications [Line Items]    
Payment Deferral 274boch_FinancingReceivablePaymentDeferralModification
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		  
Modifications $ 274boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember