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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 0-13660    
Entity Registrant Name Seacoast Banking Corporation of Florida    
Entity Incorporation, State or Country Code FL    
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    
Title of 12(b) Security Common Stock    
Trading Symbol SBCF    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,309,158,096
Entity Common Stock, Shares Outstanding   51,523,499  
Documents Incorporated by Reference
Certain portions of the registrant’s Proxy Statement for the 2020 Annual Meeting of Shareholders (the “2020 Proxy Statement”) are incorporated by reference into Part III, Items 10 through 14 of this report. Other than those portions of the 2020 Proxy Statement specifically incorporated by reference herein pursuant to Items 10 through 14, no other portions of the 2020 Proxy Statement shall be deemed so incorporated. 
    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000730708    
Current Fiscal Year End Date --12-31