Fair Value of Assets and Liabilities (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Impaired loans, valuation allowances	$ 1,347	$ 243
Mortgage servicing rights	1,081	769
Other Real Estate Property [Member]
Fair value of foreclosed real estate	0	0
(Level 3) Significant Other Unobservable Inputs [Member]
Impaired loans	8,683	1,331
Impaired loans, valuation allowances		243
Impaired loans, charge-offs	$ 159	$ 506

The fair value of foreclosed real estate with a valuation allowance or write-down as of the balance sheet date.

No definition available.

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Period Type:	instant

- Definition

Impaired Financing Receivable Charge Offs

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The fair value of impaired loans with a valuation allowance or charge-off as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	cvly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

+ Details

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Period Type:	instant

- Details

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- Details

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