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Regulatory Matters (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Capital ratios |  |  |
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 | $ 1,326,725 |  | $ 1,335,826
Actual, Ratio (as a percent) | 11.30% |  | 12.05%
Required to be considered well capitalized, Capital Amount | $ 763,495 |  | $ 720,844
Required to be considered well capitalized, Ratio (as a percent) | 6.50% |  | 6.50%
Tier I capital to risk-weighted assets |  |  |
Actual, Capital Amount | $ 1,438,995 |  | $ 1,447,428
Actual, Ratio (as a percent) | 12.25% |  | 13.05%
Minimum capital required, Ratio (as a percent) | 6.00% |  | 4.00%
Required to be considered well capitalized, Capital Amount | $ 939,686 |  | $ 887,192
Required to be considered well capitalized, Ratio (as a percent) | 8.00% |  | 8.00%
Total capital to risk-weighted assets |  |  |
Actual, Capital Amount | $ 1,501,321 |  | $ 1,503,561
Actual, Ratio (as a percent) | 12.78% |  | 13.56%
Minimum capital required, Ratio (as a percent) | 8.00% |  |
Required to be considered well capitalized, Capital Amount | $ 1,174,607 |  | $ 1,108,990
Required to be considered well capitalized, Ratio (as a percent) | 10.00% |  | 10.00%
Tier I capital to average assets (leverage ratio) |  |  |
Actual, Capital Amount | $ 1,438,995 |  | $ 1,447,428
Actual, Ratio (as a percent) | 9.73% |  | 10.65%
Minimum capital required, Ratio (as a percent) | 4.00% |  |
Required to be considered well capitalized, Capital Amount | $ 739,664 |  | $ 679,383
Required to be considered well capitalized, Ratio (as a percent) | 5.00% |  | 5.00%
Phase-In Schedule |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 822,225 |  | $ 706,981
Minimum capital required, Ratio (as a percent) | 7.00% |  | 6.38%
Tier I capital to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 998,416 |  | $ 873,330
Minimum capital required, Ratio (as a percent) | 8.50% |  | 7.88%
Total capital to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 1,233,338 |  | $ 1,095,128
Minimum capital required, Ratio (as a percent) | 10.50% |  | 9.88%
Tier I capital to average assets (leverage ratio) |  |  |
Minimum capital required, Capital Amount | $ 591,731 |  | $ 543,506
Minimum capital required, Ratio (as a percent) | 4.00% |  | 4.00%
Fully Phased-In |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 822,225 |  | $ 776,293
Minimum capital required, Ratio (as a percent) | 7.00% |  | 7.00%
Tier I capital to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 998,416 |  | $ 942,642
Minimum capital required, Ratio (as a percent) | 8.50% |  | 8.50%
Total capital to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 1,233,338 |  | $ 1,164,440
Minimum capital required, Ratio (as a percent) | 10.50% |  | 10.50%
Tier I capital to average assets (leverage ratio) |  |  |
Minimum capital required, Capital Amount | $ 591,731 |  | $ 543,506
Minimum capital required, Ratio (as a percent) | 4.00% |  | 4.00%
South State Bank (the Bank) |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |
Actual, Capital Amount | $ 1,417,616 |  | $ 1,427,764
Actual, Ratio (as a percent) | 12.07% |  | 12.87%
Required to be considered well capitalized, Capital Amount | $ 763,488 |  | $ 720,902
Required to be considered well capitalized, Ratio (as a percent) | 6.50% |  | 6.50%
Tier I capital to risk-weighted assets |  |  |
Actual, Capital Amount | $ 1,417,616 |  | $ 1,427,764
Actual, Ratio (as a percent) | 12.07% |  | 12.87%
Required to be considered well capitalized, Capital Amount | $ 939,677 |  | $ 887,264
Required to be considered well capitalized, Ratio (as a percent) | 8.00% |  | 8.00%
Total capital to risk-weighted assets |  |  |
Actual, Capital Amount | $ 1,479,942 |  | $ 1,483,897
Actual, Ratio (as a percent) | 12.60% |  | 13.38%
Required to be considered well capitalized, Capital Amount | $ 1,174,597 |  | $ 1,109,080
Required to be considered well capitalized, Ratio (as a percent) | 10.00% |  | 10.00%
Tier I capital to average assets (leverage ratio) |  |  |
Actual, Capital Amount | $ 1,417,616 |  | $ 1,427,764
Actual, Ratio (as a percent) | 9.59% |  | 10.51%
Required to be considered well capitalized, Capital Amount | $ 739,490 |  | $ 679,234
Required to be considered well capitalized, Ratio (as a percent) | 5.00% |  | 5.00%
South State Bank (the Bank) | Phase-In Schedule |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 822,218 |  | $ 707,039
Minimum capital required, Ratio (as a percent) | 7.00% |  | 6.38%
Tier I capital to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 998,407 |  | $ 873,401
Minimum capital required, Ratio (as a percent) | 8.50% |  | 7.88%
Total capital to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 1,233,327 |  | $ 1,095,217
Minimum capital required, Ratio (as a percent) | 10.50% |  | 9.88%
Tier I capital to average assets (leverage ratio) |  |  |
Minimum capital required, Capital Amount | $ 591,592 |  | $ 543,387
Minimum capital required, Ratio (as a percent) | 4.00% |  | 4.00%
South State Bank (the Bank) | Fully Phased-In |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 822,218 |  | $ 776,356
Minimum capital required, Ratio (as a percent) | 7.00% |  | 7.00%
Tier I capital to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 998,407 |  | $ 942,718
Minimum capital required, Ratio (as a percent) | 8.50% |  | 8.50%
Total capital to risk-weighted assets |  |  |
Minimum capital required, Capital Amount | $ 1,233,327 |  | $ 1,164,534
Minimum capital required, Ratio (as a percent) | 10.50% |  | 10.50%
Tier I capital to average assets (leverage ratio) |  |  |
Minimum capital required, Capital Amount | $ 591,592 |  | $ 543,387
Minimum capital required, Ratio (as a percent) | 4.00% |  | 4.00%
Minimum |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |
Actual, Ratio (as a percent) | 4.50% |  |

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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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