per share exchange ratio.

No definition available.

Name:	sbcf_BusinessAcquisitionExchangeRatio
Namespace Prefix:	sbcf_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Business Acquisition, Number Of Branches

+ References

No definition available.

+ Details

Name:	sbcf_BusinessAcquisitionNumberOfBranches
Namespace Prefix:	sbcf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of deposits due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

+ References

No definition available.

+ Details

Name:	sbcf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDeposits
Namespace Prefix:	sbcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123409700&loc=d3e13503-111538

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544

+ Details

Name:	us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

+ Details

Name:	us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sbcf_LegacyBankOfFloridaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sbcf_FourthStreetBankingCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sbcf_FirstBankOfThePalmBeachesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Business Combinations - Narrative (Details) $ in Thousands	Jun. 30, 2021 USD ($) branch	Aug. 21, 2020 USD ($) branch	Mar. 13, 2020 USD ($) branch
Legacy Bank of Florida
Business Acquisition [Line Items]
Number of branches operated \| branch	5
Loans to be acquired in acquisition	$ 476,000
Deposits to be acquired in acquisition	$ 485,600
Fourth Street Banking Company
Business Acquisition [Line Items]
Number of branches operated \| branch		2
Loans to be acquired in acquisition		$ 303,434
Deposits to be acquired in acquisition		$ 329,662
Percentage of common stock acquired		100.00%
Common stock portion, number of Seacoast stock for each share of stock converted (in shares)		0.1275
Goodwill recognized from acquisition, nondeductible		$ 9,000
First Bank of the Palm Beaches
Business Acquisition [Line Items]
Number of branches operated \| branch			2
Loans to be acquired in acquisition			$ 146,777
Deposits to be acquired in acquisition			$ 173,741
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			$ 6,900