| Document and Entity Information Document | Mar. 30, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 30, 2021 |
| Entity Registrant Name | Camden National Corp |
| Entity Central Index Key | 0000750686 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | ME |
| Entity File Number | 01-28190 |
| Entity Tax Identification Number | 01-0413282 |
| Entity Address, Address Line One | Two Elm Street |
| Entity Address, City or Town | Camden |
| Entity Address, State or Province | ME |
| Entity Address, Postal Zip Code | 04843 |
| City Area Code | 207 |
| Local Phone Number | 236-8821 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, without par value |
| Trading Symbol | CAC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Current Fiscal Year End Date | --12-31 |
