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Note 25 - Discontinued Operations (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Aug. 31, 2012
Note 25 - Discontinued Operations (Details) [Line Items]      
Number of Operating Segments 1us-gaap_NumberOfOperatingSegments    
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax   $ (746,000)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax  
Discontinued Operations Related to Ownership Interest in Mortgage Banking [Member]      
Note 25 - Discontinued Operations (Details) [Line Items]      
Noncontrolling Interest, Ownership Percentage by Parent     51.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= boch_DiscontinuedOperationsRelatedToOwnershipInterestInMortgageBankingMember
Number of Operating Segments     21us-gaap_NumberOfOperatingSegments
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= boch_DiscontinuedOperationsRelatedToOwnershipInterestInMortgageBankingMember
Aggregate Consideration Receivable Under Purchase Agreement     5,200,000boch_AggregateConsiderationReceivableUnderPurchaseAgreement
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= boch_DiscontinuedOperationsRelatedToOwnershipInterestInMortgageBankingMember
Cash Consideration Under Agreement     321,000boch_CashConsiderationUnderAgreement
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= boch_DiscontinuedOperationsRelatedToOwnershipInterestInMortgageBankingMember
Gross Consideration From Sale of Equity Interest     521,000boch_GrossConsiderationFromSaleOfEquityInterest
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= boch_DiscontinuedOperationsRelatedToOwnershipInterestInMortgageBankingMember
Consideration As Earn Out Payment Under Agreement     200,000boch_ConsiderationAsEarnOutPaymentUnderAgreement
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= boch_DiscontinuedOperationsRelatedToOwnershipInterestInMortgageBankingMember
Consideration to be Received as Promissory Notes Under Purchase Agreement     $ 4,700,000boch_ConsiderationToBeReceivedAsPromissoryNotesUnderPurchaseAgreement
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= boch_DiscontinuedOperationsRelatedToOwnershipInterestInMortgageBankingMember