Business Combinations - Purchase Price (Details) $ / shares in Units, shares in Thousands, $ in Thousands	Oct. 01, 2025 USD ($) $ / shares shares	Jul. 11, 2025 USD ($) $ / shares shares
Heartland Bancshares, Inc
Business Combination [Line Items]
Number of shares receiving stock (in shares) | shares		378
Per share exchange ratio for shares receiving stock		4.9263
Number of shares of SBCF stock issued (in shares) | shares		1,862
SBCF price per share (in dollars per share) | $ / shares		$ 29.29
Total Value of SBCF common and preferred stock issued | $		$ 54,547
Number of shares receiving cash (in shares) | shares		378
Per share cash consideration for shares receiving cash (in dollars per share) | $ / shares		$ 147.10
Cash consideration paid to shareholders, including cash paid for fractional shares | $		$ 55,623
Cash paid to option holders | $		1,054
Total purchase price | $		$ 111,224
Villages Bancorporation, Inc. | Subsequent Event
Business Combination [Line Items]
Number of shares receiving stock (in shares) | shares	550
Per share exchange ratio for shares receiving stock	38.5000
SBCF price per share (in dollars per share) | $ / shares	$ 30.50
Total Value of SBCF common and preferred stock issued | $	$ 645,785
Number of shares receiving cash (in shares) | shares	183
Per share cash consideration for shares receiving cash (in dollars per share) | $ / shares	$ 1,000
Cash consideration paid to shareholders, including cash paid for fractional shares | $	$ 183,360
Total purchase price | $	$ 829,145
Preferred stock to common stock ratio	0.001
Villages Bancorporation, Inc. | Subsequent Event | Common Stock
Business Combination [Line Items]
Number of shares of SBCF stock issued (in shares) | shares	9,923
Villages Bancorporation, Inc. | Subsequent Event | Preferred Stock
Business Combination [Line Items]
Number of shares of SBCF stock issued (in shares) | shares	11