| Cover Page | Aug. 23, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 23, 2021 |
| Entity Registrant Name | SEACOAST BANKING CORPORATION OF FLORIDA |
| Entity Incorporation, State or Country Code | FL |
| Entity File Number | 000-13660 |
| Entity Tax Identification Number | 59-2260678 |
| Entity Address, Address Line One | 815 COLORADO AVENUE, |
| Entity Address, City or Town | STUART |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 34994 |
| City Area Code | 772 |
| Local Phone Number | 287-4000 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.10 par value |
| Trading Symbol | SBCF |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000730708 |
| Amendment Flag | false |
