Represents the age of employees to be eligible to participate in the defined contribution plan.

No definition available.

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Data Type:	xbrli:durationItemType
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- Definition

Represents employee contributions to a defined contribution pension plan as a percentage of annual base compensation.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The percentage of the employee contribution for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	ssb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Defined Contribution Plan Employer Discretionary Matching Contribution Percent

+ References

No definition available.

+ Details

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Namespace Prefix:	ssb_
Data Type:	xbrli:pureItemType
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- References

No definition available.

+ Details

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Namespace Prefix:	ssb_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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- Details

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Namespace Prefix:
Data Type:	na
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- Details

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Retirement Plans - Safe Harbor plan - (Details) $ in Millions		3 Months Ended		9 Months Ended
	Jan. 01, 2015	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Employees' savings plan
Matching contribution by the company (as a percent)				100.00%
Defined contribution plan employer discretionary matching contribution percent	1
Expenses recognized under 401(K) plan		$ 1.7	$ 1.6	$ 4.5	$ 4.2
Minimum
Employees' savings plan
Age of employees to be eligible to participate in the defined contribution plan				21 years
Percentage of annual base compensation that participants may elect to contribute				1.00%
Maximum
Employees' savings plan
Percentage of annual base compensation that participants may elect to contribute				50.00%
Percentage of employees salary for which the company contributes a matching contribution				5.00%