Business Combinations - Narrative (Details) $ in Millions	Mar. 13, 2020 USD ($) branch	Dec. 31, 2019 USD ($)
First Bank of the Palm Beaches
Business Acquisition [Line Items]
Number of branches operated \| branch	2
Percentage of common stock acquired	100.00%
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)	0.2000
Goodwill recognized from acquisition, nondeductible	$ 6.8
Fourth Street Banking Company
Business Acquisition [Line Items]
Deposits of acquiree		$ 308.0
Loans of acquiree		$ 264.0

per share exchange ratio.

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Business Combination, Pro Forma Information, Financing Receivables, Actual

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Business Combination, Pro Forma Information, Total Deposits

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Number Of Branches

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

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