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Note 5 - Loans (Details) - Newly Restructured Loans and Types of Modifications (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 5 - Loans (Details) - Newly Restructured Loans and Types of Modifications [Line Items]      
Rate $ 207boch_FinancingReceivableRateModifications $ 550boch_FinancingReceivableRateModifications $ 1,677boch_FinancingReceivableRateModifications
Rate & Maturity 3,431boch_FinancingReceivableRateAndMaturityModifications 6,395boch_FinancingReceivableRateAndMaturityModifications 966boch_FinancingReceivableRateAndMaturityModifications
Rate & Payment Deferral 39boch_FinancingReceivableRateAndPaymentDeferralModifications 539boch_FinancingReceivableRateAndPaymentDeferralModifications 367boch_FinancingReceivableRateAndPaymentDeferralModifications
Maturity   7,011boch_FinancingReceivableMaturityModifications 2,942boch_FinancingReceivableMaturityModifications
Payment Deferral   2,129boch_FinancingReceivablePaymentDeferralModification 1,584boch_FinancingReceivablePaymentDeferralModification
Total 3,677boch_FinancingReceivableModifications 16,624boch_FinancingReceivableModifications 7,536boch_FinancingReceivableModifications
Commercial Portfolio Segment [Member]      
Note 5 - Loans (Details) - Newly Restructured Loans and Types of Modifications [Line Items]      
Rate & Maturity 3,396boch_FinancingReceivableRateAndMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		   17boch_FinancingReceivableRateAndMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Maturity   6,093boch_FinancingReceivableMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 104boch_FinancingReceivableMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Payment Deferral     453boch_FinancingReceivablePaymentDeferralModification
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Total 3,396boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 6,093boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 574boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Residential One To Four Family [Member]      
Note 5 - Loans (Details) - Newly Restructured Loans and Types of Modifications [Line Items]      
Rate 207boch_FinancingReceivableRateModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		 550boch_FinancingReceivableRateModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		 1,622boch_FinancingReceivableRateModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember
Rate & Maturity   205boch_FinancingReceivableRateAndMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		  
Rate & Payment Deferral 39boch_FinancingReceivableRateAndPaymentDeferralModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		 539boch_FinancingReceivableRateAndPaymentDeferralModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		 367boch_FinancingReceivableRateAndPaymentDeferralModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember
Total 246boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		 1,294boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		 1,989boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember
Consumer Other Financing Receivable [Member]      
Note 5 - Loans (Details) - Newly Restructured Loans and Types of Modifications [Line Items]      
Rate & Maturity 35boch_FinancingReceivableRateAndMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		    
Total 35boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		    
Commercial Real Estate Other Receivable [Member]      
Note 5 - Loans (Details) - Newly Restructured Loans and Types of Modifications [Line Items]      
Rate & Maturity   6,029boch_FinancingReceivableRateAndMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 740boch_FinancingReceivableRateAndMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Maturity   918boch_FinancingReceivableMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 2,838boch_FinancingReceivableMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Payment Deferral   2,129boch_FinancingReceivablePaymentDeferralModification
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 1,131boch_FinancingReceivablePaymentDeferralModification
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Total   9,076boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 4,709boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Residential Real Estate and Home Equities [Member]      
Note 5 - Loans (Details) - Newly Restructured Loans and Types of Modifications [Line Items]      
Rate     55boch_FinancingReceivableRateModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateandHomeEquitiesMember
Rate & Maturity   161boch_FinancingReceivableRateAndMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateandHomeEquitiesMember		 209boch_FinancingReceivableRateAndMaturityModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateandHomeEquitiesMember
Total   $ 161boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateandHomeEquitiesMember		 $ 264boch_FinancingReceivableModifications
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialRealEstateandHomeEquitiesMember