Capital Ratios (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	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	$ 319,708		$ 324,398	$ 301,807	$ 314,144	$ 350,401	$ 457,309
Deferred tax assets			198,647	64,964
Additional reserve for unfunded commitments			53,000
Retained earnings			1,241,413	997,657
Phasing out percentage		25.00%
Reduction in total risk-based capital	13,000
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount			$ 3,666,829	$ 3,201,644
Actual, Ratio (as a percent)			11.02%	11.75%
Minimum capital required, Capital Amount			$ 2,328,284	$ 1,906,831
Minimum capital required, Ratio (as a percent)			7.00%	7.00%
Required to be considered well capitalized, Capital Amount			$ 2,161,978	$ 1,770,629
Required to be considered well capitalized, Ratio (as a percent)			6.50%	6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount			$ 3,666,829	$ 3,201,644
Actual, Ratio (as a percent)			0.1102	0.1175
Minimum capital required, Capital Amount			$ 2,827,202	$ 2,315,438
Minimum capital required, Ratio (as a percent)			0.0850	0.0850
Required to be considered well capitalized, Capital Amount			$ 2,660,896	$ 2,179,236
Required to be considered well capitalized, Ratio (as a percent)			0.0800	0.0800
Total capital to risk-weighted assets
Actual, Capital Amount			$ 4,311,208	$ 3,692,674
Actual, Ratio (as a percent)			0.1296	0.1356
Minimum capital required, Capital Amount			$ 3,492,427	$ 2,860,247
Minimum capital required, Ratio (as a percent)			0.1050	0.1050
Required to be considered well capitalized, Capital Amount			$ 3,326,121	$ 2,724,045
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			$ 3,666,829	$ 3,201,644
Actual, Ratio (as a percent)			0.0833	0.0805
Minimum capital required, Capital Amount			$ 1,760,176	$ 1,590,045
Minimum capital required, Ratio (as a percent)			0.0400	0.0400
Required to be considered well capitalized, Capital Amount			$ 2,200,220	$ 1,987,556
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
Subordinated Debt.
Capital ratios
Trust preferred securities redeemed	$ 13,000
SouthState Bank (the Bank)
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount			$ 3,956,892	$ 3,431,069
Actual, Ratio (as a percent)			11.91%	12.62%
Minimum capital required, Capital Amount			$ 2,325,129	$ 1,902,954
Minimum capital required, Ratio (as a percent)			7.00%	7.00%
Required to be considered well capitalized, Capital Amount			$ 2,159,049	$ 1,767,029
Required to be considered well capitalized, Ratio (as a percent)			6.50%	6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount			$ 3,956,892	$ 3,431,069
Actual, Ratio (as a percent)			0.1191	0.1262
Minimum capital required, Capital Amount			$ 2,823,371	$ 2,310,730
Minimum capital required, Ratio (as a percent)			0.0850	0.0850
Required to be considered well capitalized, Capital Amount			$ 2,657,291	$ 2,174,804
Required to be considered well capitalized, Ratio (as a percent)			0.0800	0.0800
Total capital to risk-weighted assets
Actual, Capital Amount			$ 4,211,272	$ 3,594,099
Actual, Ratio (as a percent)			0.1268	0.1322
Minimum capital required, Capital Amount			$ 3,487,694	$ 2,854,431
Minimum capital required, Ratio (as a percent)			0.1050	0.1050
Required to be considered well capitalized, Capital Amount			$ 3,321,613	$ 2,718,505
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			$ 3,956,892	$ 3,431,069
Actual, Ratio (as a percent)			0.0900	0.0865
Minimum capital required, Capital Amount			$ 1,759,585	$ 1,587,212
Minimum capital required, Ratio (as a percent)			0.0400	0.0400
Required to be considered well capitalized, Capital Amount			$ 2,199,481	$ 1,984,015
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
Required to be considered well capitalized, 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