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FINANCING RECEIVABLES ON NONACCRUAL STATUS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Loans On Nonaccrual Status [Line Items]    
Total $ 1,061us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 3,015us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Commercial Loan [Member] | Operating [Member]    
Loans On Nonaccrual Status [Line Items]    
Total 673us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cmoh_OperatingMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
949us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cmoh_OperatingMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Commercial Loan [Member] | Real Estate 1-4 Family [Member]    
Loans On Nonaccrual Status [Line Items]    
Total 179us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cmoh_RealEstate14FamilyMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
278us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cmoh_RealEstate14FamilyMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Commercial Loan [Member] | Real Estate Other [Member]    
Loans On Nonaccrual Status [Line Items]    
Total 69us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cmoh_RealEstateOtherMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
1,286us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cmoh_RealEstateOtherMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Residential Real Estate [Member] | Residential Real Estate Other [Member]    
Loans On Nonaccrual Status [Line Items]    
Total 18us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cmoh_ResidentialRealEstateOtherMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialRealEstateMember
137us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cmoh_ResidentialRealEstateOtherMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialRealEstateMember
Consumer Loan [Member] | Equity [Member]    
Loans On Nonaccrual Status [Line Items]    
Total 99us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
358us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Consumer Loan [Member] | Collateralized Auto Loans [Member]    
Loans On Nonaccrual Status [Line Items]    
Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CollateralizedAutoLoansMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
3us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CollateralizedAutoLoansMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Consumer Loan [Member] | Consumer Other Financing Receivable [Member]    
Loans On Nonaccrual Status [Line Items]    
Total $ 23us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ 4us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember