Capital Ratios (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2023	Dec. 31, 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	$ 300,396	$ 370,645	$ 356,444	$ 301,807
Deferred tax assets		165,161	177,801
Additional reserve for unfunded commitments		85,100
Retained earnings		1,448,636	1,347,042
Phasing out percentage	50.00%
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount		$ 3,891,155	$ 3,788,106
Actual, Ratio (as a percent)		11.13%	10.96%
Required to be considered well capitalized, Capital Amount		$ 2,271,735	$ 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		$ 3,891,155	$ 3,788,106
Actual, Ratio (as a percent)		0.1113	0.1096
Minimum capital required, Capital Amount		$ 2,795,981	$ 2,766,190
Minimum capital required, Ratio (as a percent)		0.0800	0.0800
Total capital to risk-weighted assets
Actual, Capital Amount		$ 4,647,783	$ 4,485,397
Actual, Ratio (as a percent)		0.1330	0.1297
Required to be considered well capitalized, Capital Amount		$ 3,494,976	$ 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		$ 3,891,155	$ 3,788,106
Actual, Ratio (as a percent)		0.0905	0.0872
Required to be considered well capitalized, Capital Amount		$ 2,149,255	$ 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		$ 4,165,577	$ 4,074,045
Actual, Ratio (as a percent)		11.93%	11.80%
Required to be considered well capitalized, Capital Amount		$ 2,268,697	$ 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		$ 4,165,577	$ 4,074,045
Actual, Ratio (as a percent)		0.1193	0.1180
Minimum capital required, Capital Amount		$ 2,792,242	$ 2,762,438
Minimum capital required, Ratio (as a percent)		0.0800	0.0800
Total capital to risk-weighted assets
Actual, Capital Amount		$ 4,532,206	$ 4,381,336
Actual, Ratio (as a percent)		0.1299	0.1269
Required to be considered well capitalized, Capital Amount		$ 3,490,303	$ 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		$ 4,165,577	$ 4,074,045
Actual, Ratio (as a percent)		0.0970	0.0939
Required to be considered well capitalized, Capital Amount		$ 2,148,291	$ 2,170,412
Required to be considered well capitalized, Ratio (as a percent)		0.0500	0.0500
Fully Phased-In
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount		$ 2,446,483	$ 2,420,417
Minimum capital required, Ratio (as a percent)		7.00%	7.00%
Tier I capital to risk-weighted assets
Required to be considered well capitalized, Capital Amount		$ 2,970,730	$ 2,939,077
Required to be considered well capitalized, Ratio (as a percent)		0.0850	0.0850
Total capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 3,669,725	$ 3,630,625
Minimum capital required, Ratio (as a percent)		0.1050	0.1050
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount		$ 1,719,404	$ 1,736,991
Minimum capital required, Ratio (as a percent)		0.0400	0.0400
Fully Phased-In | SouthState Bank (the Bank)
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount		$ 2,443,212	$ 2,417,133
Minimum capital required, Ratio (as a percent)		7.00%	7.00%
Tier I capital to risk-weighted assets
Required to be considered well capitalized, Capital Amount		$ 2,966,757	$ 2,935,090
Required to be considered well capitalized, Ratio (as a percent)		0.0850	0.0850
Total capital to risk-weighted assets
Minimum capital required, Capital Amount		$ 3,664,818	$ 3,625,700
Minimum capital required, Ratio (as a percent)		0.1050	0.1050
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount		$ 1,718,633	$ 1,736,330
Minimum capital required, Ratio (as a percent)		0.0400	0.0400
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