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Note 22 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 22 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments [Line Items]      
Losses resulting from nonrecurring fair value adjustments $ 2,216boch_NonrecurringFairValueAdjustmentsLosses $ 745boch_NonrecurringFairValueAdjustmentsLosses $ 5,296boch_NonrecurringFairValueAdjustmentsLosses
Impaired Loans [Member]      
Note 22 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments [Line Items]      
Losses resulting from nonrecurring fair value adjustments 2,216boch_NonrecurringFairValueAdjustmentsLosses
/ us-gaap_FairValueByAssetClassAxis
= boch_ImpairedLoansMember		 745boch_NonrecurringFairValueAdjustmentsLosses
/ us-gaap_FairValueByAssetClassAxis
= boch_ImpairedLoansMember		 5,296boch_NonrecurringFairValueAdjustmentsLosses
/ us-gaap_FairValueByAssetClassAxis
= boch_ImpairedLoansMember
Other Real Estate Owned [Member]      
Note 22 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments [Line Items]      
Losses resulting from nonrecurring fair value adjustments $ 42boch_NonrecurringFairValueAdjustmentsLosses
/ us-gaap_FairValueByAssetClassAxis
= boch_OtherRealEstateOwnedMember		   $ 435boch_NonrecurringFairValueAdjustmentsLosses
/ us-gaap_FairValueByAssetClassAxis
= boch_OtherRealEstateOwnedMember