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Note 15 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Note 15 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments [Line Items]    
Losses resulting from nonrecurring fair value adjustments $ 67boch_NonrecurringFairValueAdjustmentsLosses $ 4,899boch_NonrecurringFairValueAdjustmentsLosses
Impaired Loans [Member]    
Note 15 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments [Line Items]    
Losses resulting from nonrecurring fair value adjustments 52boch_NonrecurringFairValueAdjustmentsLosses
/ us-gaap_FairValueByAssetClassAxis
= boch_ImpairedLoansMember		 4,609boch_NonrecurringFairValueAdjustmentsLosses
/ us-gaap_FairValueByAssetClassAxis
= boch_ImpairedLoansMember
Other Real Estate Owned [Member]    
Note 15 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments [Line Items]    
Losses resulting from nonrecurring fair value adjustments $ 15boch_NonrecurringFairValueAdjustmentsLosses
/ us-gaap_FairValueByAssetClassAxis
= boch_OtherRealEstateOwnedMember		 $ 290boch_NonrecurringFairValueAdjustmentsLosses
/ us-gaap_FairValueByAssetClassAxis
= boch_OtherRealEstateOwnedMember