Recent Accounting and Regulatory Pronouncements (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2017
Recent Accounting and Regulatory Pronouncements
Amount adjusted against income tax expense	$ 104,000	$ 839,000

Represents the amount of adjustment towards excess tax benefit on share based compensation.

No definition available.

Name:	ssb_AdjustmentTowardsExcessTaxBenefitOnShareBasedCompensation
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration