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Note 14 - Derivatives (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
Aug. 31, 2010
Aug. 31, 2011
Feb. 04, 2011
Note 14 - Derivatives (Details) [Line Items]            
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net   $ (150,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet        
Interest Expense 1,157,000us-gaap_InterestExpense 827,000us-gaap_InterestExpense        
Obligation to Return Securities Received as Collateral 3,300,000us-gaap_ObligationToReturnSecuritiesReceivedAsCollateral          
Number of Mortgage Backed Securities Pledged 3boch_NumberOfMortgageBackedSecuritiesPledged          
Pledge On One Mortgage Backed Securities 4,100,000boch_PledgeOnOneMortgageBackedSecurities          
Fair Value, Estimate Not Practicable, Mortgage-backed Securities Held-to-maturity 4,300,000us-gaap_FairValueEstimateNotPracticableMortgageBackedSecuritiesHeldToMaturity          
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Derivatives [Member]            
Note 14 - Derivatives (Details) [Line Items]            
Interest Expense   88,000us-gaap_InterestExpense
/ us-gaap_IncomeStatementLocationAxis
= boch_GainsLossesOnDerivativesMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
       
Other Noninterest Income [Member]            
Note 14 - Derivatives (Details) [Line Items]            
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     952,000us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= boch_OtherNoninterestIncomeMember
     
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]            
Note 14 - Derivatives (Details) [Line Items]            
Interest Rate Derivative Liabilities, at Fair Value 75,000,000us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
         
Forward Starting Interest Rate Swaps [Member]            
Note 14 - Derivatives (Details) [Line Items]            
Derivative, Number of Instruments Held       5us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= boch_ForwardStartingInterestRateSwapsMember
   
Interest Rate Swap [Member]            
Note 14 - Derivatives (Details) [Line Items]            
Derivative, Number of Instruments Held         4us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
 
Derivative Asset, Notional Amount           $ 3,000,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember