Loans - Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($) contract	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($) contract	Dec. 31, 2019 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract	3	2	8	4	3
Pre- Modification Outstanding Recorded Investment	$ 59	$ 370	$ 541	$ 2,365
Post- Modification Outstanding Recorded Investment	$ 59	$ 370	$ 541	$ 2,365	$ 1,400
Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract	1	0	1	0
Pre- Modification Outstanding Recorded Investment	$ 12	$ 0	$ 12	$ 0
Post- Modification Outstanding Recorded Investment	$ 12	$ 0	$ 12	$ 0
Commercial real estate - owner-occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract	0	1	0	2
Pre- Modification Outstanding Recorded Investment	$ 0	$ 351	$ 0	$ 2,166
Post- Modification Outstanding Recorded Investment	$ 0	$ 351	$ 0	$ 2,166
Commercial real estate - non owner-occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract	0	0	0	0
Pre- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract	0	0	1	0
Pre- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 45	$ 0
Post- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 45	$ 0
Commercial and financial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract	0	0	4	1
Pre- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 437	$ 180
Post- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 437	$ 180
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract	2	1	2	1
Pre- Modification Outstanding Recorded Investment	$ 47	$ 19	$ 47	$ 19
Post- Modification Outstanding Recorded Investment	$ 47	$ 19	$ 47	$ 19

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.

No definition available.

+ Details

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

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: