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Business Combinations - Narrative (Details) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2023 USD ($) branch | Oct. 07, 2022 USD ($) branch | Jan. 03, 2022 USD ($) branch | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  | $ 732,417 | $ 732,417 | $ 480,319 | $ 252,154
Fair value of Apollo options and warrants converted |  |  |  |  | 10,300 | 10,400 |
Allowance for credit losses |  |  |  | 138,055 | 148,931 | 113,895 | $ 83,315
Acquisition costs |  |  |  | $ 0 | $ 33,200 | $ 27,900 |
Professional Holding Corp. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches acquired | branch | 9 |  |  |  |  |  |
Percentage of common stock acquired | 100.00% |  |  |  |  |  |
Exchange ratio (in shares) | 0.8909 |  |  |  |  |  |
Goodwill | $ 251,674 |  |  |  |  |  |
Fair value of Apollo options and warrants converted | 10,304 |  |  |  |  |  |
Allowance for credit losses | 45,500 |  |  |  |  |  |
Measurement Period Adjustments, Loans | $ (5,544) |  |  |  |  |  |
Intangible assets weighted average useful life | 8 years |  |  |  |  |  |
Professional Holding Corp. | PCD Loans |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for credit losses at acquisition | $ 18,879 |  |  |  |  |  |
Professional Holding Corp. | Acquired Non-PCD Loans |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for credit losses | $ 26,600 |  |  |  |  |  |
Apollo Bancshares, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches acquired | branch |  | 5 |  |  |  |  |
Exchange ratio (in shares) |  | 1.006529 |  |  |  |  |
Goodwill |  | $ 90,488 |  |  |  |  |
Fair value of Apollo options and warrants converted |  | 6,530 |  |  |  |  |
Allowance for credit losses |  | 7,800 |  |  |  |  |
Measurement Period Adjustments, Loans |  | $ 0 |  |  |  |  |
Minority interest portion, number of Seacoast stock for each share of stock converted (in shares) |  | 1.195651 |  |  |  |  |
Apollo Bancshares, Inc. | PCD Loans |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for credit losses at acquisition |  | $ 2,658 |  |  |  |  |
Apollo Bancshares, Inc. | Acquired Non-PCD Loans |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  | $ 5,100 |  |  |  |  |
Drummond Banking Company |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches acquired | branch |  | 18 |  |  |  |  |
Percentage of common stock acquired |  | 100.00% |  |  |  |  |
Exchange ratio (in shares) |  | 51.9561 |  |  |  |  |
Goodwill |  | $ 103,649 |  |  |  |  |
Allowance for credit losses |  | 12,500 |  |  |  |  |
Measurement Period Adjustments, Loans |  | 0 |  |  |  |  |
Goodwill, nondeductible for tax purposes |  | 103,600 |  |  |  |  |
Drummond Banking Company | PCD Loans |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for credit losses at acquisition |  | 2,566 |  |  |  |  |
Drummond Banking Company | Acquired Non-PCD Loans |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  | $ 9,900 |  |  |  |  |
Business Bank of Florida |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches acquired | branch |  |  | 1 |  |  |  |
Percentage of common stock acquired |  |  | 100.00% |  |  |  |
Exchange ratio (in shares) |  |  | 0.7997 |  |  |  |
Goodwill |  |  | $ 7,962 |  |  |  |
Fair value of Apollo options and warrants converted |  |  | 497 |  |  |  |
Allowance for credit losses |  |  | 1,800 |  |  |  |
Goodwill, nondeductible for tax purposes |  |  | 8,000 |  |  |  |
Business Bank of Florida | Stock options | Seacoast 2021 Incentive Plan |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of Apollo options and warrants converted |  |  | 500 |  |  |  |
Business Bank of Florida | PCD Loans |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  | 15 |  |  |  |
Allowance for credit losses at acquisition |  |  | 15 |  |  |  |
Business Bank of Florida | Acquired Non-PCD Loans |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  | $ 1,800 |  |  |  |
Sabal Palm Bancorp, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches acquired | branch |  |  | 3 |  |  |  |
Percentage of common stock acquired |  |  | 100.00% |  |  |  |
Exchange ratio (in shares) |  |  | 0.2203 |  |  |  |
Goodwill |  |  | $ 26,489 |  |  |  |
Fair value of Apollo options and warrants converted |  |  | 3,336 |  |  |  |
Allowance for credit losses |  |  | 3,400 |  |  |  |
Goodwill, nondeductible for tax purposes |  |  | 26,500 |  |  |  |
Sabal Palm Bancorp, Inc. | Stock options | Seacoast 2021 Incentive Plan |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of Apollo options and warrants converted |  |  | 3,300 |  |  |  |
Sabal Palm Bancorp, Inc. | PCD Loans |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  | 37 |  |  |  |
Allowance for credit losses at acquisition |  |  | 37 |  |  |  |
Sabal Palm Bancorp, Inc. | Acquired Non-PCD Loans |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  | $ 3,400 |  |  |  |

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