Capital Ratios (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount		$ 695,107
Actual, Ratio (as a percent)		12.16%
Minimum capital required, Ratio (as a percent)		4.50%
Required to be considered well capitalized, Capital Amount		$ 372,011
Required to be considered well capitalized, Ratio (as a percent)		6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount		$ 745,570	$ 713,371	$ 676,812
Actual, Ratio (as a percent)		13.03%	13.62%	12.94%
Minimum capital required, Capital Amount			$ 209,491	$ 209,172
Minimum capital required, Ratio (as a percent)		6.00%	4.00%	4.00%
Required to be considered well capitalized, Capital Amount		$ 457,860
Required to be considered well capitalized, Ratio (as a percent)		8.00%
Total capital to risk-weighted assets
Actual, Capital Amount		$ 785,245	$ 755,484	$ 721,832
Actual, Ratio (as a percent)		13.72%	14.43%	13.80%
Minimum capital required, Capital Amount			$ 418,982	$ 418,344
Minimum capital required, Ratio (as a percent)		8.00%	8.00%	8.00%
Required to be considered well capitalized, Capital Amount		$ 572,325
Required to be considered well capitalized, Ratio (as a percent)		10.00%
Tier I capital to average assets (leverage ratio)
Actual, Capital Amount		$ 745,570	$ 713,371	$ 676,812
Actual, Ratio (as a percent)		9.68%	9.47%	8.93%
Minimum capital required, Capital Amount			$ 301,363	$ 303,089
Minimum capital required, Ratio (as a percent)		4.00%	4.00%	4.00%
Required to be considered well capitalized, Capital Amount		$ 385,089
Required to be considered well capitalized, Ratio (as a percent)		5.00%
Subsequent event
Capital ratios
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent)	2.50%
Phase-In Schedule
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount		$ 257,546
Minimum capital required, Ratio (as a percent)		4.50%
Tier I capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 343,395
Minimum capital required, Ratio (as a percent)		6.00%
Total capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 457,860
Minimum capital required, Ratio (as a percent)		8.00%
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount		$ 308,071
Minimum capital required, Ratio (as a percent)		4.00%
Fully Phased-In
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount		$ 400,628
Minimum capital required, Ratio (as a percent)		7.00%
Tier I capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 486,476
Minimum capital required, Ratio (as a percent)		8.50%
Total capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 600,941
Minimum capital required, Ratio (as a percent)		10.50%
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount		$ 308,071
Minimum capital required, Ratio (as a percent)		4.00%
South State Bank (the Bank)
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount		$ 725,545
Actual, Ratio (as a percent)		12.68%
Required to be considered well capitalized, Capital Amount		$ 371,874
Required to be considered well capitalized, Ratio (as a percent)		6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount		$ 725,545	$ 700,280	$ 666,432
Actual, Ratio (as a percent)		12.68%	13.37%	12.74%
Minimum capital required, Capital Amount			$ 209,438	$ 209,183
Minimum capital required, Ratio (as a percent)			4.00%	4.00%
Required to be considered well capitalized, Capital Amount		$ 457,692	$ 314,158	$ 313,774
Required to be considered well capitalized, Ratio (as a percent)		8.00%	6.00%	6.00%
Total capital to risk-weighted assets
Actual, Capital Amount		$ 765,221	$ 742,393	$ 711,319
Actual, Ratio (as a percent)		13.38%	14.18%	13.60%
Minimum capital required, Capital Amount			$ 418,877	$ 418,366
Minimum capital required, Ratio (as a percent)			8.00%	8.00%
Required to be considered well capitalized, Capital Amount		$ 572,115	$ 523,596	$ 522,957
Required to be considered well capitalized, Ratio (as a percent)		10.00%	10.00%	10.00%
Tier I capital to average assets (leverage ratio)
Actual, Capital Amount		$ 725,545	$ 700,280	$ 666,432
Actual, Ratio (as a percent)		9.43%	9.30%	8.81%
Minimum capital required, Capital Amount			$ 301,162	$ 302,609
Minimum capital required, Ratio (as a percent)			4.00%	4.00%
Required to be considered well capitalized, Capital Amount		$ 384,851	$ 376,452	$ 378,261
Required to be considered well capitalized, Ratio (as a percent)		5.00%	5.00%	5.00%
South State Bank (the Bank) | Phase-In Schedule
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount		$ 257,452
Minimum capital required, Ratio (as a percent)		4.50%
Tier I capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 343,269
Minimum capital required, Ratio (as a percent)		6.00%
Total capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 457,692
Minimum capital required, Ratio (as a percent)		8.00%
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount		$ 307,881
Minimum capital required, Ratio (as a percent)		4.00%
South State Bank (the Bank) | Fully Phased-In
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount		$ 400,480
Minimum capital required, Ratio (as a percent)		7.00%
Tier I capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 486,297
Minimum capital required, Ratio (as a percent)		8.50%
Total capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 600,720
Minimum capital required, Ratio (as a percent)		10.50%
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount		$ 307,881
Minimum capital required, Ratio (as a percent)		4.00%