| DEI Document | Oct. 22, 2020 |
| Entity Information [Line Items] | |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock, $.01 par value per share |
| Entity File Number | 1-9047 |
| Entity Registrant Name | INDEPENDENT BANK CORP. |
| Document Type | 8-K |
| Document Period End Date | Oct. 22, 2020 |
| Entity Incorporation, State or Country Code | MA |
| Entity Tax Identification Number | 04-2870273 |
| City Area Code | 781 |
| Entity Address, Address Line One | 2036 Washington Street, |
| Entity Address, City or Town | Hanover, |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02339 |
| Trading Symbol | INDB |
| Security Exchange Name | NASDAQ |
| Local Phone Number | 878-6100 |
| Entity Central Index Key | 0000776901 |
| Amendment Flag | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Issuer Tender Offer | false |
| Pre-commencement Tender Offer | false |
| Mailing Address [Member] | |
| Entity Information [Line Items] | |
| Entity Address, Address Line One | 288 Union Street, |
| Entity Address, City or Town | Rockland, |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02370 |
