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Note 12 - Commitments and Contingencies (Details) - Summary of the Bank’s Commitments and Contingent Liabilities (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Note 12 - Commitments and Contingencies (Details) - Summary of the Bank’s Commitments and Contingent Liabilities [Line Items]    
Commitments $ 198,674us-gaap_OtherCommitment $ 205,586us-gaap_OtherCommitment
Commitments to Extend Credit [Member]    
Note 12 - Commitments and Contingencies (Details) - Summary of the Bank’s Commitments and Contingent Liabilities [Line Items]    
Commitments 192,988us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 200,991us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Standby Letters of Credit [Member]    
Note 12 - Commitments and Contingencies (Details) - Summary of the Bank’s Commitments and Contingent Liabilities [Line Items]    
Commitments 2,329us-gaap_OtherCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember		 2,731us-gaap_OtherCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
Guaranteed Commitments Outstanding [Member]    
Note 12 - Commitments and Contingencies (Details) - Summary of the Bank’s Commitments and Contingent Liabilities [Line Items]    
Commitments $ 3,357us-gaap_OtherCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= boch_GuaranteedCommitmentsOutstandingMember		 $ 1,864us-gaap_OtherCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= boch_GuaranteedCommitmentsOutstandingMember