Capital Ratios (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Jan. 01, 2019
Regulatory Matters
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent)					2.50%
Additional allowance for credit losses for loans	$ 623,690	$ 465,280	$ 469,654	$ 456,573
Deferred tax assets	153,930	179,884
Additional reserve for unfunded commitments	62,300
Retained earnings	2,080,053	2,046,809
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount	$ 5,480,248	$ 4,547,314
Actual, Ratio (as a percent)	0.1103%	12.62%
Required to be considered well capitalized, Capital Amount	$ 3,230,921	$ 2,342,717
Required to be considered well capitalized, Ratio (as a percent)	0.065%	6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount	$ 5,480,248	$ 4,547,314
Actual, Ratio (as a percent)	0.1103	0.1262
Required to be considered well capitalized, Capital Amount	$ 3,976,518	$ 2,883,343
Required to be considered well capitalized, Ratio (as a percent)	0.08	0.08
Total capital to risk-weighted assets
Actual, Capital Amount	$ 6,819,716	$ 5,391,194
Actual, Ratio (as a percent)	0.1372	0.1496
Required to be considered well capitalized, Capital Amount	$ 4,970,648	$ 3,604,179
Required to be considered well capitalized, Ratio (as a percent)	0.10	0.10
Tier I capital to average assets (leverage ratio)
Actual, Capital Amount	$ 5,480,248	$ 4,547,314
Actual, Ratio (as a percent)	0.0891	0.1004
Required to be considered well capitalized, Capital Amount	$ 3,076,439	$ 2,263,732
Required to be considered well capitalized, Ratio (as a percent)	0.05	0.05
SouthState Bank (the Bank)
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount	$ 6,104,593	$ 4,817,945
Actual, Ratio (as a percent)	0.1229%	13.38%
Required to be considered well capitalized, Capital Amount	$ 3,227,360	$ 2,340,060
Required to be considered well capitalized, Ratio (as a percent)	0.065%	6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount	$ 6,104,593	$ 4,817,945
Actual, Ratio (as a percent)	0.1229	0.1338
Required to be considered well capitalized, Capital Amount	$ 3,972,135	$ 2,880,074
Required to be considered well capitalized, Ratio (as a percent)	0.08	0.08
Total capital to risk-weighted assets
Actual, Capital Amount	$ 6,693,461	$ 5,271,725
Actual, Ratio (as a percent)	0.1348	0.1464
Required to be considered well capitalized, Capital Amount	$ 4,965,169	$ 3,600,093
Required to be considered well capitalized, Ratio (as a percent)	0.10	0.10
Tier I capital to average assets (leverage ratio)
Actual, Capital Amount	$ 6,104,593	$ 4,817,945
Actual, Ratio (as a percent)	0.0992	0.1064
Required to be considered well capitalized, Capital Amount	$ 3,075,592	$ 2,263,121
Required to be considered well capitalized, Ratio (as a percent)	0.05	0.05
Fully Phased-In
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount	$ 3,479,453	$ 2,522,926
Minimum capital required, Capital Amount	$ 4,225,051	$ 3,063,552
Minimum capital required, Ratio (as a percent)	0.07%	7.00%
Tier I capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 4,225,051	$ 3,063,552
Minimum capital required, Ratio (as a percent)	0.085	0.085
Total capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 5,219,180	$ 3,784,388
Minimum capital required, Ratio (as a percent)	0.105	0.105
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount	$ 2,461,151	$ 1,810,985
Minimum capital required, Ratio (as a percent)	0.04	0.04
Fully Phased-In | SouthState Bank (the Bank)
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount	$ 3,475,618	$ 2,520,065
Minimum capital required, Capital Amount	$ 4,220,393	$ 3,060,079
Minimum capital required, Ratio (as a percent)	0.07%	7.00%
Tier I capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 4,220,393	$ 3,060,079
Minimum capital required, Ratio (as a percent)	0.085	0.085
Total capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 5,213,427	$ 3,780,097
Minimum capital required, Ratio (as a percent)	0.105	0.105
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount	$ 2,460,474	$ 1,810,497
Minimum capital required, Ratio (as a percent)	0.04	0.04
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