Business Combinations - Purchase Price (Details) $ / shares in Units, $ in Thousands				12 Months Ended
	Jan. 31, 2023 USD ($) $ / shares shares	Oct. 07, 2022 USD ($) $ / shares shares	Jan. 03, 2022 USD ($) $ / shares shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Fair value of options and warrants converted				$ 10,300	$ 10,400	$ 4,700
Professional Holding Corp.
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares	14,358,000
Exchange ratio (in shares)	0.8909
Number of shares of SBCF common stock issues (in shares) | shares	12,792,000
Multiplied by common stock price per share (in dollars per share) | $ / shares	$ 32.11
Value of common stock issued	$ 410,738
Cash paid for fractional shares	5
Fair value of options and warrants converted	10,304
Total purchase price	$ 421,047
Apollo Bancshares, Inc.
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares		3,766,000
Exchange ratio (in shares)		1.006529
Number of shares of SBCF common stock issues (in shares) | shares		3,791,000
Number of minority interest shares outstanding (in shares) | shares		609,000
Per share exchange ratio (in shares)		1.195651
Number of shares of SBCF common stock issued, minority interest converted (in shares) | shares		728,000
Number of shares of common stock issued (in shares) | shares		4,519,000
Multiplied by common stock price per share (in dollars per share) | $ / shares		$ 30.83
Value of common stock issued		$ 139,307
Cash paid for fractional shares		5
Fair value of options and warrants converted		6,530
Total purchase price		$ 145,842
Drummond Banking Company
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares		99,000
Exchange ratio (in shares)		51.9561
Number of shares of common stock issued (in shares) | shares		5,136,000
Multiplied by common stock price per share (in dollars per share) | $ / shares		$ 30.83
Total purchase price		$ 158,332
Business Bank of Florida
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares			1,112,000
Exchange ratio (in shares)			0.7997
Number of shares of common stock issued (in shares) | shares			889,000
Multiplied by common stock price per share (in dollars per share) | $ / shares			$ 35.39
Value of common stock issued			$ 31,480
Fair value of options and warrants converted			497
Total purchase price			$ 31,977
Sabal Palm Bancorp, Inc.
Business Acquisition [Line Items]
Number of shares outstanding (in shares) | shares			7,536,000
Exchange ratio (in shares)			0.2203
Number of shares of common stock issued (in shares) | shares			1,660,000
Multiplied by common stock price per share (in dollars per share) | $ / shares			$ 35.39
Value of common stock issued			$ 58,762
Fair value of options and warrants converted			3,336
Total purchase price			$ 62,098