Capital Ratios (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Jan. 01, 2020	Jan. 01, 2019
Capital ratios
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent)									2.50%
Additional allowance for credit losses for loans		$ 447,956	$ 427,392	$ 356,444	$ 324,398	$ 319,708	$ 301,807
Deferred tax assets		150,422		177,801
Additional reserve for unfunded commitments		62,300
Retained earnings		1,618,080		1,347,042
Phasing out percentage	50.00%
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount		$ 4,089,424		$ 3,788,106
Actual, Ratio (as a percent)		11.47%		10.96%
Minimum capital required, Capital Amount		$ 2,495,806		$ 2,420,417
Minimum capital required, Ratio (as a percent)		7.00%		7.00%
Required to be considered well capitalized, Capital Amount		$ 2,317,534		$ 2,247,530
Required to be considered well capitalized, Ratio (as a percent)		6.50%		6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount		$ 4,089,424		$ 3,788,106
Actual, Ratio (as a percent)		0.1147		0.1096
Minimum capital required, Capital Amount		$ 3,030,621		$ 2,939,077
Minimum capital required, Ratio (as a percent)		0.0850		0.0850
Required to be considered well capitalized, Capital Amount		$ 2,852,349		$ 2,766,190
Required to be considered well capitalized, Ratio (as a percent)		0.0800		0.0800
Total capital to risk-weighted assets
Actual, Capital Amount		$ 4,905,268		$ 4,485,397
Actual, Ratio (as a percent)		0.1376		0.1297
Minimum capital required, Capital Amount		$ 3,743,709		$ 3,630,625
Minimum capital required, Ratio (as a percent)		0.1050		0.1050
Required to be considered well capitalized, Capital Amount		$ 3,565,437		$ 3,457,738
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		$ 4,089,424		$ 3,788,106
Actual, Ratio (as a percent)		0.0934		0.0872
Minimum capital required, Capital Amount		$ 1,751,637		$ 1,736,991
Minimum capital required, Ratio (as a percent)		0.0400		0.0400
Required to be considered well capitalized, Capital Amount		$ 2,189,546		$ 2,171,239
Required to be considered well capitalized, Ratio (as a percent)		0.0500		0.0500
ASU 2016-13
Capital ratios
Additional allowance for credit losses for loans								$ 54,400
Deferred tax assets								12,600
Retained earnings								(44,800)
ASU 2016-13 | Adjustments
Capital ratios
Additional reserve for unfunded commitments								$ 6,400
SouthState Bank (the Bank)
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount		$ 4,360,670		$ 4,074,045
Actual, Ratio (as a percent)		12.25%		11.80%
Minimum capital required, Capital Amount		$ 2,492,670		$ 2,417,133
Minimum capital required, Ratio (as a percent)		7.00%		7.00%
Required to be considered well capitalized, Capital Amount		$ 2,314,622		$ 2,244,481
Required to be considered well capitalized, Ratio (as a percent)		6.50%		6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount		$ 4,360,670		$ 4,074,045
Actual, Ratio (as a percent)		0.1225		0.1180
Minimum capital required, Capital Amount		$ 3,026,814		$ 2,935,090
Minimum capital required, Ratio (as a percent)		0.0850		0.0850
Required to be considered well capitalized, Capital Amount		$ 2,848,766		$ 2,762,438
Required to be considered well capitalized, Ratio (as a percent)		0.0800		0.0800
Total capital to risk-weighted assets
Actual, Capital Amount		$ 4,786,514		$ 4,381,336
Actual, Ratio (as a percent)		0.1344		0.1269
Minimum capital required, Capital Amount		$ 3,739,005		$ 3,625,700
Minimum capital required, Ratio (as a percent)		0.1050		0.1050
Required to be considered well capitalized, Capital Amount		$ 3,560,957		$ 3,453,047
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		$ 4,360,670		$ 4,074,045
Actual, Ratio (as a percent)		0.0996		0.0939
Minimum capital required, Capital Amount		$ 1,751,135		$ 1,736,330
Minimum capital required, Ratio (as a percent)		0.0400		0.0400
Required to be considered well capitalized, Capital Amount		$ 2,188,919		$ 2,170,412
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