Regulatory Matters (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Jan. 01, 2019
Regulatory Matters
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent)							2.50%
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount		$ 4,159,187	$ 3,788,106
Actual, Ratio (as a percent)		0.1175%	0.1096%
Required to be considered well capitalized, Capital Amount		$ 2,300,003	$ 2,247,530
Required to be considered well capitalized, Ratio (as a percent)		0.065%	0.065%
Tier One Risk Based Capital to Risk Weighted Assets [Abstract]
Actual, Capital Amount		$ 4,159,187	$ 3,788,106
Actual, Ratio (as a percent)		0.1175	0.1096
Leverage ratio (as a percent)		0.0942	0.0872
Tier One Risk Based Capital Required to be Well Capitalized		$ 2,830,773	$ 2,766,190
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (as a percent)		0.0800	0.0800
Total capital to risk-weighted assets
Actual, Capital Amount		$ 4,983,012	$ 4,485,397
Capital to Risk Weighted Assets (as a percent)		0.1408	0.1297
Required to be considered well capitalized, Capital Amount		$ 3,538,466	$ 3,457,738
Required to be considered well capitalized, Ratio (as a percent)		0.1000	0.1000
Tier One Leverage Capital to Average Assets [Abstract]
Tier One Leverage Capital		$ 4,159,187	$ 3,788,106
Tier One Leverage Capital to Average Assets (as a percent)		0.0942	0.0872
Tier One Leverage Capital Required to be Well Capitalized		$ 2,206,619	$ 2,171,239
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (as a percent)		0.0500	0.0500
Depreciation, Depletion and Amortization, Other Than Amortization of Debt Discount (Premium)		$ 58,826	$ 64,591	$ 63,137
Additional allowance for credit losses for loans		456,573	356,444	$ 301,807	$ 457,309
Deferred tax assets		164,354	177,801
Retained earnings		1,685,166	1,347,042
Phasing out percentage	50.00%
Fully Phased-In
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount		$ 2,476,926	$ 2,420,417
Minimum capital required, Ratio (as a percent)		0.07%	0.07%
Tier One Risk Based Capital to Risk Weighted Assets [Abstract]
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy With Buffer, Minimum		$ 3,007,696	$ 2,939,077
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy With Buffer, Minimum		0.0850	0.0850
Total capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 3,715,389	$ 3,630,625
Minimum capital required, Ratio (as a percent)		0.1050	0.1050
Tier One Leverage Capital to Average Assets [Abstract]
Tier One Leverage Capital Required for Capital Adequacy		$ 1,765,295	$ 1,736,991
Minimum capital required, Ratio (as a percent)		0.0400	0.0400
ASU 2016-13
Tier One Leverage Capital to Average Assets [Abstract]
Additional allowance for credit losses for loans						$ 54,400
Deferred tax assets						12,600
Retained earnings						44,800
ASU 2016-13 | Adjustments
Tier One Leverage Capital to Average Assets [Abstract]
Additional reserve for unfunded commitments						$ 6,400
Minimum
Common equity Tier 1 to risk-weighted assets
Actual, Ratio (as a percent)		4.50%
Tier One Risk Based Capital to Risk Weighted Assets [Abstract]
Leverage ratio (as a percent)		0.08
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy With Buffer, Minimum		6
Total capital to risk-weighted assets
Capital to Risk Weighted Assets (as a percent)		0.04
Tier One Leverage Capital to Average Assets [Abstract]
Tier One Leverage Capital to Average Assets (as a percent)		0.08
SouthState Bank (the Bank)
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount		$ 4,424,466	$ 4,074,045
Actual, Ratio (as a percent)		0.1252%	0.118%
Required to be considered well capitalized, Capital Amount		$ 2,297,250	$ 2,244,481
Required to be considered well capitalized, Ratio (as a percent)		0.065%	0.065%
Tier One Risk Based Capital to Risk Weighted Assets [Abstract]
Actual, Capital Amount		$ 4,424,466	$ 4,074,045
Actual, Ratio (as a percent)		0.1252	0.1180
Leverage ratio (as a percent)		0.1003	0.0939
Tier One Risk Based Capital Required to be Well Capitalized		$ 2,827,384	$ 2,762,438
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (as a percent)		0.0800	0.0800
Total capital to risk-weighted assets
Actual, Capital Amount		$ 4,858,292	$ 4,381,336
Capital to Risk Weighted Assets (as a percent)		0.1375	0.1269
Required to be considered well capitalized, Capital Amount		$ 3,534,230	$ 3,453,047
Required to be considered well capitalized, Ratio (as a percent)		0.1000	0.1000
Tier One Leverage Capital to Average Assets [Abstract]
Tier One Leverage Capital		$ 4,424,466	$ 4,074,045
Tier One Leverage Capital to Average Assets (as a percent)		0.1003	0.0939
Tier One Leverage Capital Required to be Well Capitalized		$ 2,205,921	$ 2,170,412
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (as a percent)		0.0500	0.0500
SouthState Bank (the Bank) | Fully Phased-In
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount		$ 2,473,961	$ 2,417,133
Minimum capital required, Ratio (as a percent)		0.07%	0.07%
Tier One Risk Based Capital to Risk Weighted Assets [Abstract]
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy With Buffer, Minimum		$ 3,004,096	$ 2,935,090
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy With Buffer, Minimum		0.0850	0.0850
Total capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 3,710,942	$ 3,625,700
Minimum capital required, Ratio (as a percent)		0.1050	0.1050
Tier One Leverage Capital to Average Assets [Abstract]
Tier One Leverage Capital Required for Capital Adequacy		$ 1,764,736	$ 1,736,330
Minimum capital required, Ratio (as a percent)		0.0400	0.0400