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Amount excluding accrued interest, of allowance for credit loss on financing receivable.

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Business Combinations - Additional Information (Details) $ / shares in Units, $ in Thousands					1 Months Ended	5 Months Ended	12 Months Ended
	Jan. 03, 2022 USD ($) branch	Aug. 06, 2021 USD ($) branch	Aug. 21, 2020 USD ($) branch	Mar. 13, 2020 USD ($) branch	Aug. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Share-based compensation expense							$ 8,685	$ 7,304	$ 7,244
Acquisition costs							7,900	9,100	1,000
Specific reserve						$ 83,315	$ 83,315	$ 92,733	$ 35,154	$ 32,423
Stock options
Business Acquisition [Line Items]
Shares granted (in shares) \| shares							356,497		3,438
Weighted-average exercise price, granted (in dollars per share) \| $ / shares							$ 16.70
Legacy Bank of Florida
Business Acquisition [Line Items]
Number of branches acquired \| branch		5
Percentage of common stock acquired		100.00%
Exchange ratio (in shares)		0.1703
Goodwill, nondeductible for tax purposes		$ 31,000
Fair value of options converted		4,736
Specific reserve		11,200
Legacy Bank of Florida \| Stock options \| Seacoast 2021 Incentive Plan
Business Acquisition [Line Items]
Shares granted (in shares) \| shares					356,497
Weighted-average exercise price, granted (in dollars per share) \| $ / shares					$ 16.70
Fair value of options converted					$ 4,700
Share-based compensation expense						$ 900
Legacy Bank of Florida \| PCD Loans
Business Acquisition [Line Items]
Specific reserve		3,000
Legacy Bank of Florida \| Acquired Non-PCD Loans
Business Acquisition [Line Items]
Specific reserve		$ 8,200
Fourth Street Banking Company
Business Acquisition [Line Items]
Number of branches acquired \| branch			2
Percentage of common stock acquired			100.00%
Exchange ratio (in shares)			0.1275
Goodwill, nondeductible for tax purposes			$ 9,000
Specific reserve			10,400
Fourth Street Banking Company \| PCD Loans
Business Acquisition [Line Items]
Specific reserve			5,800
Fourth Street Banking Company \| Acquired Non-PCD Loans
Business Acquisition [Line Items]
Specific reserve			$ 4,600
First Bank of The Palm Beaches
Business Acquisition [Line Items]
Number of branches operated \| branch				2
Percentage of common stock acquired				100.00%
Exchange ratio (in shares)				0.2000
Goodwill, nondeductible for tax purposes				$ 6,900
Specific reserve				2,300
First Bank of The Palm Beaches \| PCD Loans
Business Acquisition [Line Items]
Specific reserve				500
First Bank of The Palm Beaches \| Acquired Non-PCD Loans
Business Acquisition [Line Items]
Specific reserve				$ 1,800
Florida Business Bank \| Subsequent Event
Business Acquisition [Line Items]
Number of branches operated \| branch	1
Percentage of common stock acquired	100.00%
Exchange ratio (in shares)	0.7997
Fair value of options converted	$ 497
Sabal Palm Bancorp, Inc. \| Subsequent Event
Business Acquisition [Line Items]
Number of branches operated \| branch	3
Percentage of common stock acquired	100.00%
Exchange ratio (in shares)	0.2203
Fair value of options converted	$ 3,336