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Note 20 - Regulatory Capital (Details) - Regulatory Capital Requirements (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Subtotal Bank of Commerce Holdings [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Leverage capital (to average assets) actual amount $ 113,963us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
$ 120,661us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Leverage capital (to average assets) actual ratio 11.59%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
12.80%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Leverage capital (to average assets) for capital adequacy purposes amount 39,328us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
37,720us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Leverage capital (to average assets) for capital adequacy purposes ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Leverage capital (to average assets) to be well capitalized amount      
Leverage capital (to average assets) to be well capitalized ratio      
Tier 1 capital (to risk-weighted assets) actual amount 113,963us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
120,661us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Tier 1 capital (to risk-weighted assets) actual ratio 13.91%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
15.94%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes amount 32,764us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
30,280us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Tier 1 capital (to risk-weighted assets) to be well capitalized amount      
Tier 1 capital (to risk-weighted assets) to be well capitalized ratio      
Total capital (to risk-weighted assets) actual amount 124,217us-gaap_Capital
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
130,191us-gaap_Capital
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Total capital (to risk-weighted assets) actual ratio 15.16%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
17.20%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Total capital (to risk-weighted assets) for capital adequacy purposes amount 65,529us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
60,559us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Total capital (to risk-weighted assets) for capital adequacy purposes ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_SubtotalBankOfCommerceHoldingsMember
Total capital (to risk-weighted assets) to be well capitalized amount      
Total capital (to risk-weighted assets) to be well capitalized ratio      
Commercial Banking [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Leverage capital (to average assets) actual amount 113,640us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
117,354us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Leverage capital (to average assets) actual ratio 11.57%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
12.49%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Leverage capital (to average assets) for capital adequacy purposes amount 39,279us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
37,595us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Leverage capital (to average assets) for capital adequacy purposes ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Leverage capital (to average assets) to be well capitalized amount 49,098us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
46,994us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Leverage capital (to average assets) to be well capitalized ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Tier 1 capital (to risk-weighted assets) actual amount 113,640us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
117,354us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Tier 1 capital (to risk-weighted assets) actual ratio 13.89%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
15.56%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes amount 32,734us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
30,173us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Tier 1 capital (to risk-weighted assets) to be well capitalized amount 49,101us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
45,260us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Tier 1 capital (to risk-weighted assets) to be well capitalized ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Total capital (to risk-weighted assets) actual amount 123,885us-gaap_Capital
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
126,850us-gaap_Capital
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Total capital (to risk-weighted assets) actual ratio 15.14%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
16.82%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Total capital (to risk-weighted assets) for capital adequacy purposes amount 65,469us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
60,347us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Total capital (to risk-weighted assets) for capital adequacy purposes ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Total capital (to risk-weighted assets) to be well capitalized amount $ 81,836us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
$ 75,433us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
Total capital (to risk-weighted assets) to be well capitalized ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= boch_CommercialBankingMember