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Business Combinations - Narrative (Details)
$ / shares in Units, $ in Millions
Oct. 19, 2018
branch
$ / shares
Nov. 03, 2017
USD ($)
branch
$ / shares
Oct. 20, 2017
USD ($)
branch
$ / shares
Apr. 07, 2017
USD ($)
branch
$ / shares
Gulf Shore Banc shares Inc        
Business Acquisition [Line Items]        
Number of branches acquired | branch       3
Other assets acquired       $ 358.0
Loans acquired       251.0
Deposits acquired       $ 285.0
Percentage of common stock acquired       100.00%
Cash portion, cash per share for common stock converted (in dollars per share) | $ / shares       $ 1.47
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)       0.4807
Multiplied by common stock price per share (in dollars per share) | $ / shares       $ 23.94
Goodwill recognized from acquisition, nondeductible       $ 37.1
NorthStar Bank        
Business Acquisition [Line Items]        
Number of branches acquired | branch     3  
Other assets acquired     $ 216.0  
Loans acquired     137.0  
Deposits acquired     $ 182.0  
Percentage of common stock acquired     100.00%  
Cash portion, cash per share for common stock converted (in dollars per share) | $ / shares     $ 2.40  
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)     0.5605  
Multiplied by common stock price per share (in dollars per share) | $ / shares     $ 24.92  
Goodwill recognized from acquisition, nondeductible     $ 12.3  
Palm Beach Community Bank        
Business Acquisition [Line Items]        
Other assets acquired   $ 357.0    
Loans acquired   270.0    
Deposits acquired   $ 269.0    
Percentage of common stock acquired   100.00%    
Cash portion, cash per share for common stock converted (in dollars per share) | $ / shares   $ 6.26    
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)   0.924    
Multiplied by common stock price per share (in dollars per share) | $ / shares   $ 24.31    
Goodwill recognized from acquisition, nondeductible   $ 34.8    
First Green Bancorp, Inc. | Subsequent Event        
Business Acquisition [Line Items]        
Number of branches acquired | branch 7      
Percentage of common stock acquired 100.00%      
Common stock portion, number of Seacoast stock for each share of stock converted (in shares) 0.7324      
Multiplied by common stock price per share (in dollars per share) | $ / shares $ 26.87      
Palm Beach Community Bank        
Business Acquisition [Line Items]        
Number of branches operated | branch   4