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REGULATORY MATTERS (Details)
Dec. 31, 2014
Dec. 31, 2013
Regulatory Matters [Line Items]    
Well capitalized Capital to risk weighted assets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Adequately capitalized Capital to risk weighted assets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Undercapitalized Capital to risk weighted assets 6.00%cmoh_CapitalRequiredForUndercapitalizedWeightedAssets  
Well capitalized Tier 1 Capital to risk-weighted assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Adequately capitalized Tier 1 Capital to risk-weighted assets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Undercapitalized Tier 1 Capital to risk-weighted assets 3.00%cmoh_TierOneRiskBasedCapitalRequiredForUnderCapitalizedToRiskWeightedAssets  
Well capitalized Tier1 capital to average assets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Adequately capitalized Tier1 capital to average assets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Undercapitalized Tier1 capital to average assets 3.00%cmoh_TierOneLeverageCapitalRequiredForUndercapitalizedToAverageAssets