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STOCK-BASED COMPENSATION (Details 3) (USD $)
12 Months Ended
Dec. 31, 2014
Nonvested Stock Option Activity [Line Items]  
Nonvested options at January 1, 2014, Number Of Options 23,349cmoh_ShareBasedCompensationStockOptionsNonvestedNumber
Granted, Number Of Options 11,000cmoh_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsGrantsinPeriod
Vested, Number Of Options (11,649)cmoh_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsVestedInPeriod
Forfeited, Number Of Options (100)cmoh_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionsForfeitedInPeriod
Nonvested options at December 31, 2014, Number Of Options 22,600cmoh_ShareBasedCompensationStockOptionsNonvestedNumber
Nonvested options at January 1, 2014, Weighted Average Price $ 19.90cmoh_ShareBasedCompensationArrangementStockOptionsNonvestedWeightedAveragePrice
Granted, Weighted Average Price $ 24.47cmoh_ShareBasedCompensationArrangementStockOptionsGrantsInPeriodWeightedAveragePrice
Vested, Weighted Average Price $ 19.34cmoh_ShareBasedCompensationArrangementStockOptionsVestedInPeriodWeightedAveragePrice
Forfeited, Weighted Average Price $ 19.28cmoh_ShareBasedCompensationArrangementStockOptionsForfeituresWeightedAveragePrice
Nonvested options at December 31, 2014, Weighted Average Price $ 22.41cmoh_ShareBasedCompensationArrangementStockOptionsNonvestedWeightedAveragePrice