Cash, Dividend and Loan Restrictions - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Cash, Dividend and Loan Restrictions [Abstract]
Average balance reserve requirement	$ 0.0	$ 38.7
Average amount of reserve balances	4.8	$ 7.9
Maximum amount of loans available for transfer	$ 90.1

Average Reserve Balance Required To Be Maintained With Federal Reserve Bank

No definition available.

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