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Business Combinations - Purchase Price (Details) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended
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Jan. 31, 2023 USD ($) $ / shares shares | Oct. 07, 2022 USD ($) $ / shares shares | Jan. 03, 2022 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Fair value of Professional options converted |  |  |  | $ 10,300 | $ 10,400
Professional Holding Corp. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of shares outstanding (in shares) | shares | 14,358,000 |  |  |  |
Per share 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 SBCF common stock issued | $ 410,738 |  |  |  |
Cash paid for fractional shares | 5 |  |  |  |
Fair value of Professional options 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 |  |  |
Per share exchange ratio (in shares) |  | 1.006529 |  |  |
Number of shares of SBCF common stock issues (in shares) | shares |  | 3,791,000 |  |  |
Number of Apollo Bank 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 |  |  |
Total number of shares of SBCF 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 SBCF common stock issued |  | $ 139,307 |  |  |
Cash paid for fractional shares |  | 5 |  |  |
Fair value of Professional options converted |  | 6,530 |  |  |
Total purchase price |  | $ 145,842 |  |  |
Drummond Banking Company |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of shares outstanding (in shares) | shares |  | 99,000 |  |  |
Per share exchange ratio (in shares) |  | 51.9561 |  |  |
Total number of shares of SBCF 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 |  |
Per share exchange ratio (in shares) |  |  | 0.7997 |  |
Total number of shares of SBCF common stock issued (in shares) | shares |  |  | 889,000 |  |
Multiplied by common stock price per share (in dollars per share) | $ / shares |  |  | $ 35.39 |  |
Value of SBCF common stock issued |  |  | $ 31,480 |  |
Fair value of Professional options 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 |  |
Per share exchange ratio (in shares) |  |  | 0.2203 |  |
Total number of shares of SBCF 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 SBCF common stock issued |  |  | $ 58,762 |  |
Fair value of Professional options converted |  |  | 3,336 |  |
Total purchase price |  |  | $ 62,098 |  |

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