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Employee Benefits - Deferred compensation plan (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Appreciation in cash surrender value of bank owned life insurance	$ 614us-gaap_BankOwnedLifeInsuranceIncome	$ 495us-gaap_BankOwnedLifeInsuranceIncome	$ 391us-gaap_BankOwnedLifeInsuranceIncome
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Director [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Interest rate on deferred amounts	3.92%cvcy_DeferredCompensationInterestRateOnDeferredAmounts / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Net deferrals included in accrued interest payable and other liabilities	3,154us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember	2,976us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Cash surrender value of life insurance	3,519us-gaap_CashSurrenderValueOfLifeInsurance / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember	3,416us-gaap_CashSurrenderValueOfLifeInsurance / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Appreciation in cash surrender value of bank owned life insurance	$ 103us-gaap_BankOwnedLifeInsuranceIncome / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember	$ 108us-gaap_BankOwnedLifeInsuranceIncome / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember	$ 103us-gaap_BankOwnedLifeInsuranceIncome / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember

X

- Definition

Deferred Compensation Interest Rate on Deferred Amounts

+ References

No definition available.

+ Details

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X

- Definition

Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 4

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765

+ Details

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X

- Definition

The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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- Details

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