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Note 21 - Derivatives (Details) - Gains (Losses) on Derivatives and Location on Income Statement (Forward Starting Interest Rate Swaps [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]    
Total $ 1,900boch_AccumulatedNetGainLossFromReclassificationsFromAOCI $ 600boch_AccumulatedNetGainLossFromReclassificationsFromAOCI
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Forward starting interest rate swaps (1) 283us-gaap_InterestExpenseBorrowings
/ us-gaap_DerivativeByNatureAxis
= boch_ForwardStartingInterestRateSwapsMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 [1] 600us-gaap_InterestExpenseBorrowings
/ us-gaap_DerivativeByNatureAxis
= boch_ForwardStartingInterestRateSwapsMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 [1]
Forward starting interest rate swaps (1) $ 1,617us-gaap_NoninterestIncomeOther
/ us-gaap_DerivativeByNatureAxis
= boch_ForwardStartingInterestRateSwapsMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 [1]    [1]
[1] Cash flow hedge designation removed. Gains represent tax adjusted amounts reclassified from accumulated OCI pertaining to the terminated forward starting interest rate swap.