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Note 6 - Loans (Details) - Troubled Debt Restructurings With Subsequent Default (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Note 6 - Loans (Details) - Troubled Debt Restructurings With Subsequent Default [Line Items]    
Troubled debt restructurings that subsequently defaulted, number of contracts 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Troubled debt restructurings that subsequently defaulted, recorded investment $ 52us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1  
Residential One to Four Family [Member]    
Note 6 - Loans (Details) - Troubled Debt Restructurings With Subsequent Default [Line Items]    
Troubled debt restructurings that subsequently defaulted, number of contracts 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember		  
Troubled debt restructurings that subsequently defaulted, recorded investment $ 52us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= boch_ResidentialOneToFourFamilyMember