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Business Combinations - Narrative (Details)
$ in Thousands
3 Months Ended
Aug. 21, 2020
USD ($)
branch
Mar. 13, 2020
USD ($)
branch
Sep. 30, 2021
USD ($)
branch
Legacy Bank of Florida | Forecast      
Business Acquisition [Line Items]      
Number of branches operated | branch     5
Deposits to be acquired in acquisition     $ 501,000
Loans to be acquired in acquisition     $ 490,000
Fourth Street Banking Company      
Business Acquisition [Line Items]      
Number of branches operated | branch 2    
Deposits to be acquired in acquisition $ 329,662    
Loans to be acquired in acquisition $ 303,434    
Percentage of common stock acquired 100.00%    
Common stock portion, number of Seacoast stock for each share of stock converted (in shares) 0.1275    
Goodwill recognized from acquisition, nondeductible $ 9,000    
First Bank of the Palm Beaches      
Business Acquisition [Line Items]      
Number of branches operated | branch   2  
Deposits to be acquired in acquisition   $ 173,741  
Loans to be acquired in acquisition   $ 146,777  
Percentage of common stock acquired   100.00%  
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)   0.2000  
Goodwill recognized from acquisition, nondeductible   $ 6,900