Business Combinations - Fair Value of Acquired Loans (Details) - USD ($) $ in Thousands	Aug. 21, 2020	Mar. 13, 2020
Fourth Street Banking Company
Business Acquisition [Line Items]
Book Balance	$ 317,193
Fair Value	303,434
Fourth Street Banking Company \| Construction and land development
Business Acquisition [Line Items]
Book Balance	9,197
Fair Value	8,851
Fourth Street Banking Company \| Commercial real estate - owner-occupied
Business Acquisition [Line Items]
Book Balance	77,936
Fair Value	75,215
Fourth Street Banking Company \| Commercial real estate - non owner-occupied
Business Acquisition [Line Items]
Book Balance	76,014
Fair Value	71,171
Fourth Street Banking Company \| Residential real estate
Business Acquisition [Line Items]
Book Balance	23,548
Fair Value	23,227
Fourth Street Banking Company \| Commercial and financial
Business Acquisition [Line Items]
Book Balance	72,745
Fair Value	68,096
Fourth Street Banking Company \| Consumer
Business Acquisition [Line Items]
Book Balance	2,748
Fair Value	2,694
Fourth Street Banking Company \| PPP loans
Business Acquisition [Line Items]
Book Balance	55,005
Fair Value	$ 54,180
First Bank of the Palm Beaches
Business Acquisition [Line Items]
Book Balance		$ 150,342
Fair Value		146,777
First Bank of the Palm Beaches \| Construction and land development
Business Acquisition [Line Items]
Book Balance		9,493
Fair Value		9,012
First Bank of the Palm Beaches \| Commercial real estate - owner-occupied
Business Acquisition [Line Items]
Book Balance		46,221
Fair Value		45,171
First Bank of the Palm Beaches \| Commercial real estate - non owner-occupied
Business Acquisition [Line Items]
Book Balance		36,268
Fair Value		35,079
First Bank of the Palm Beaches \| Residential real estate
Business Acquisition [Line Items]
Book Balance		47,569
Fair Value		47,043
First Bank of the Palm Beaches \| Commercial and financial
Business Acquisition [Line Items]
Book Balance		9,659
Fair Value		9,388
First Bank of the Palm Beaches \| Consumer
Business Acquisition [Line Items]
Book Balance		1,132
Fair Value		$ 1,084

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

- 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=121585399&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

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544

Reference 2: 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=121585399&loc=d3e13503-111538

+ Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=sbcf_PaycheckProtectionProgramCARESActMember
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: