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Note 15 - Commitments and Contingencies (Details) - Summary of the Bank’s Commitments and Contingent Liabilities (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 15 - Commitments and Contingencies (Details) - Summary of the Bank’s Commitments and Contingent Liabilities [Line Items]    
Commitments $ 205,586us-gaap_OtherCommitment $ 198,805us-gaap_OtherCommitment
Commitments to Extend Credit [Member]    
Note 15 - Commitments and Contingencies (Details) - Summary of the Bank’s Commitments and Contingent Liabilities [Line Items]    
Commitments 200,991us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 192,351us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Standby Letters of Credit [Member]    
Note 15 - Commitments and Contingencies (Details) - Summary of the Bank’s Commitments and Contingent Liabilities [Line Items]    
Commitments 2,731us-gaap_OtherCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember		 4,583us-gaap_OtherCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
Guaranteed Commitments Outstanding [Member]    
Note 15 - Commitments and Contingencies (Details) - Summary of the Bank’s Commitments and Contingent Liabilities [Line Items]    
Commitments $ 1,864us-gaap_OtherCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= boch_GuaranteedCommitmentsOutstandingMember		 $ 1,871us-gaap_OtherCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= boch_GuaranteedCommitmentsOutstandingMember