No definition available.

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

+ Details

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

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_NotesReceivableNetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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:

- Details

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

Allowance for Credit Losses - Schedule of Loan Portfolio, Excluding PCI Loans and Related Allowance (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Recorded Investment
Individually Evaluated	$ 45,837		$ 49,196
Collectively Evaluated	5,860,047		5,686,153
Total	5,905,884		5,735,349
Associated Allowance
Individually Evaluated	4,946		7,708
Collectively Evaluated	82,877		85,025
Total	87,823	$ 81,127	92,733	$ 94,013	$ 91,250	$ 35,154
Construction and land development
Recorded Investment
Individually Evaluated	80		276
Collectively Evaluated	227,379		244,832
Total	227,459		245,108
Associated Allowance
Individually Evaluated	3		13
Collectively Evaluated	2,600		4,907
Total	2,603	4,053	4,920	7,701	7,161	1,842
Commercial real estate - owner-occupied
Recorded Investment
Individually Evaluated	5,689		10,243
Collectively Evaluated	1,195,647		1,131,067
Total	1,201,336		1,141,310
Associated Allowance
Individually Evaluated	420		402
Collectively Evaluated	8,232		9,466
Total	8,652	8,676	9,868	7,219	5,562	5,361
Commercial real estate - non owner-occupied
Recorded Investment
Individually Evaluated	5,190		8,083
Collectively Evaluated	1,668,397		1,387,771
Total	1,673,587		1,395,854
Associated Allowance
Individually Evaluated	95		1,640
Collectively Evaluated	39,990		36,626
Total	40,085	34,807	38,266	34,018	38,992	7,863
Residential real estate
Recorded Investment
Individually Evaluated	18,654		16,506
Collectively Evaluated	1,448,675		1,326,122
Total	1,467,329		1,342,628
Associated Allowance
Individually Evaluated	513		2,064
Collectively Evaluated	13,614		15,436
Total	14,127	12,543	17,500	17,325	20,453	7,667
Commercial and financial
Recorded Investment
Individually Evaluated	15,478		13,281
Collectively Evaluated	967,074		841,472
Total	982,552		854,753
Associated Allowance
Individually Evaluated	3,350		3,498
Collectively Evaluated	16,174		15,192
Total	19,524	18,016	18,690	24,654	15,514	9,716
Consumer
Recorded Investment
Individually Evaluated	746		807
Collectively Evaluated	162,273		187,928
Total	163,019		188,735
Associated Allowance
Individually Evaluated	565		91
Collectively Evaluated	2,267		3,398
Total	2,832	3,032	3,489	3,096	3,568	2,705
Paycheck Protection Program
Recorded Investment
Individually Evaluated	0		0
Collectively Evaluated	190,602		566,961
Total	190,602		566,961
Associated Allowance
Individually Evaluated	0		0
Collectively Evaluated	0		0
Total	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0