Capital Ratios (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Jan. 31, 2020	Jan. 01, 2019
Regulatory Matters
Minimum capital required, Capital Amount	$ 2,506,088		$ 2,476,926
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent)								2.50%
Additional allowance for credit losses for loans	467,981	$ 472,298	456,573	$ 447,956	$ 427,392	$ 356,444
Deferred tax assets	122,384		164,354
Additional reserve for unfunded commitments	41,500
Retained earnings	$ 1,943,874		1,685,166
Phasing out percentage	25.00%
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount	$ 4,430,297		$ 4,159,187
Actual, Ratio (as a percent)	12.37%		11.75%
Minimum capital required, Capital Amount	$ 3,043,106		$ 3,007,696
Minimum capital required, Ratio (as a percent)	7.00%		7.00%
Required to be considered well capitalized, Capital Amount	$ 2,327,081		$ 2,300,003
Required to be considered well capitalized, Ratio (as a percent)	6.50%		6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount	$ 4,430,297		$ 4,159,187
Actual, Ratio (as a percent)	0.1237		0.1175
Minimum capital required, Capital Amount	$ 3,043,106		$ 3,007,696
Minimum capital required, Ratio (as a percent)	0.0850		0.0850
Required to be considered well capitalized, Capital Amount	$ 2,864,100		$ 2,830,773
Required to be considered well capitalized, Ratio (as a percent)	0.0800		0.0800
Total capital to risk-weighted assets
Actual, Capital Amount	$ 5,271,150		$ 4,983,012
Actual, Ratio (as a percent)	0.1472		0.1408
Minimum capital required, Capital Amount	$ 3,759,131		$ 3,715,389
Minimum capital required, Ratio (as a percent)	0.1050		0.1050
Required to be considered well capitalized, Capital Amount	$ 3,580,125		$ 3,538,466
Required to be considered well capitalized, Ratio (as a percent)	0.1000		0.1000
Tier I capital to average assets (leverage ratio)
Actual, Capital Amount	$ 4,430,297		$ 4,159,187
Actual, Ratio (as a percent)	0.0998		0.0942
Minimum capital required, Capital Amount	$ 1,776,398		$ 1,765,295
Minimum capital required, Ratio (as a percent)	0.0400		0.0400
Required to be considered well capitalized, Capital Amount	$ 2,220,497		$ 2,206,619
Required to be considered well capitalized, Ratio (as a percent)	0.0500		0.0500
ASU 2016-13
Regulatory Matters
Additional allowance for credit losses for loans							$ 54,400
Deferred tax assets							12,600
Retained earnings							44,800
ASU 2016-13 | Adjustments
Regulatory Matters
Additional reserve for unfunded commitments							$ 6,400
SouthState Bank (the Bank)
Regulatory Matters
Minimum capital required, Capital Amount	$ 2,503,356		$ 2,473,961
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount	$ 4,702,224		$ 4,424,466
Actual, Ratio (as a percent)	13.15%		12.52%
Minimum capital required, Capital Amount	$ 3,039,789		$ 3,004,096
Minimum capital required, Ratio (as a percent)	7.00%		7.00%
Required to be considered well capitalized, Capital Amount	$ 2,324,544		$ 2,297,250
Required to be considered well capitalized, Ratio (as a percent)	6.50%		6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount	$ 4,702,224		$ 4,424,466
Actual, Ratio (as a percent)	0.1315		0.1252
Minimum capital required, Capital Amount	$ 3,039,789		$ 3,004,096
Minimum capital required, Ratio (as a percent)	0.0850		0.0850
Required to be considered well capitalized, Capital Amount	$ 2,860,978		$ 2,827,384
Required to be considered well capitalized, Ratio (as a percent)	0.0800		0.0800
Total capital to risk-weighted assets
Actual, Capital Amount	$ 5,152,981		$ 4,858,292
Actual, Ratio (as a percent)	0.1441		0.1375
Minimum capital required, Capital Amount	$ 3,755,033		$ 3,710,942
Minimum capital required, Ratio (as a percent)	0.1050		0.1050
Required to be considered well capitalized, Capital Amount	$ 3,576,222		$ 3,534,230
Required to be considered well capitalized, Ratio (as a percent)	0.1000		0.1000
Tier I capital to average assets (leverage ratio)
Actual, Capital Amount	$ 4,702,224		$ 4,424,466
Actual, Ratio (as a percent)	0.1059		0.1003
Minimum capital required, Capital Amount	$ 1,775,892		$ 1,764,736
Minimum capital required, Ratio (as a percent)	0.0400		0.0400
Required to be considered well capitalized, Capital Amount	$ 2,219,865		$ 2,205,921
Required to be considered well capitalized, Ratio (as a percent)	0.0500		0.0500
Minimum
Common equity Tier 1 to risk-weighted assets
Actual, Ratio (as a percent)	4.50%
Tier I capital to risk-weighted assets
Minimum capital required, Ratio (as a percent)	0.06
Total capital to risk-weighted assets
Actual, Ratio (as a percent)	0.04
Tier I capital to average assets (leverage ratio)
Actual, Ratio (as a percent)	0.08