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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
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Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
No. of Options Outstanding | 167,554 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Aggregate Intrinsic Value | $ 1,640 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
No. of Options Currently Exercisable | 89,750 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
Aggregate Intrinsic Value of Options Currently Exercisable | 879 us-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 | 39,250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Weighted-Average Exercise Price | $ 30.84 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Weighted Average Remaining Contractual Life, Outstanding | 44 months
Aggregate Intrinsic Value | 616 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
No. of Options Currently Exercisable | 23,750 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Weighted-Average Exercise Price of Options Currently Exercisable | $ 30.02 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesTwentySixPointSixTwoToThirtyThreePointNineZeroMember
Weighted Average Remaining Contractual Life, Exercisable | 31 months
Aggregate Intrinsic Value of Options Currently Exercisable | 392 us-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 | $ 26.62 us-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 | $ 33.90 us-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 | 128,304 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
Weighted-Average Exercise Price | $ 38.55 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
Weighted Average Remaining Contractual Life, Outstanding | 58 months
Aggregate Intrinsic Value | 1,024 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
No. of Options Currently Exercisable | 66,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
Weighted-Average Exercise Price of Options Currently Exercisable | $ 39.15 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember
Weighted Average Remaining Contractual Life, Exercisable | 25 months
Aggregate Intrinsic Value of Options Currently Exercisable | $ 487 us-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 | $ 35.09 us-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 | $ 44.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember / chco_RangeOfStockOptionExercisePricesAxis = chco_RangesOfExercisePricesThirtyFivePointZeroNineToFortyPointEightEightMember

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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