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Employee Benefit Plans (Stock Options Outstanding And Exercisable) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
No. of Options Outstanding	167,554us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Aggregate Intrinsic Value	$ 1,640us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
No. of Options Currently Exercisable	89,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
Aggregate Intrinsic Value of Options Currently Exercisable	879us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
Ranges Of Exercise Prices 26.62 - 33.90
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
No. of Options Outstanding	39,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Weighted-Average Exercise Price	$ 30.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Weighted Average Remaining Contractual Life, Outstanding	44 months
Aggregate Intrinsic Value	616us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
No. of Options Currently Exercisable	23,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Weighted-Average Exercise Price of Options Currently Exercisable	$ 30.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Weighted Average Remaining Contractual Life, Exercisable	31 months
Aggregate Intrinsic Value of Options Currently Exercisable	392us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Ranges Of Exercise Prices 26.62 - 33.90 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges Of Exercise Prices	$ 26.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Ranges Of Exercise Prices 26.62 - 33.90 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges Of Exercise Prices	$ 33.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Ranges Of Exercise Prices 35.09 - 40.88
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
No. of Options Outstanding	128,304us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
Weighted-Average Exercise Price	$ 38.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
Weighted Average Remaining Contractual Life, Outstanding	58 months
Aggregate Intrinsic Value	1,024us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
No. of Options Currently Exercisable	66,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
Weighted-Average Exercise Price of Options Currently Exercisable	$ 39.15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
Weighted Average Remaining Contractual Life, Exercisable	25 months
Aggregate Intrinsic Value of Options Currently Exercisable	$ 487us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
Ranges Of Exercise Prices 35.09 - 40.88 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges Of Exercise Prices	$ 35.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
Ranges Of Exercise Prices 35.09 - 40.88 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges Of Exercise Prices	$ 44.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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