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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2023
Regulatory Capital Requirements Under Banking Regulations [Abstract] |
Summary of Risk-Based Capital Amounts and Ratios | The following table summarizes risk-based capital amounts and ratios for S&T and S&T Bank:
| Actual |  | Minimum Regulatory Capital Requirements |  | To be Well Capitalized Under Prompt Corrective Action Provisions
(dollars in thousands) | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2023 |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
S&T | $ | 1,034,828 |  |  | 11.21 | % |  | $ | 369,297 |  |  | 4.00 | % |  | $ | 461,621 |  |  | 5.00 | %
S&T Bank | 995,824 |  |  | 10.79 | % |  | 369,133 |  |  | 4.00 | % |  | 461,416 |  |  | 5.00 | %
Common Equity Tier 1 ratio |  |  |  |  |  |  |  |  |  |  |
S&T | 1,010,828 |  |  | 13.37 | % |  | 340,159 |  |  | 4.50 | % |  | 491,341 |  |  | 6.50 | %
S&T Bank | 995,824 |  |  | 13.18 | % |  | 339,954 |  |  | 4.50 | % |  | 491,045 |  |  | 6.50 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 1,034,828 |  |  | 13.69 | % |  | 453,545 |  |  | 6.00 | % |  | 604,727 |  |  | 8.00 | %
S&T Bank | 995,824 |  |  | 13.18 | % |  | 453,272 |  |  | 6.00 | % |  | 604,362 |  |  | 8.00 | %
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 1,154,376 |  |  | 15.27 | % |  | 604,727 |  |  | 8.00 | % |  | 755,909 |  |  | 10.00 | %
S&T Bank | 1,115,315 |  |  | 14.76 | % |  | 604,362 |  |  | 8.00 | % |  | 755,453 |  |  | 10.00 | %
As of December 31, 2022 |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
S&T | $ | 967,708 |  |  | 11.06 | % |  | $ | 349,914 |  |  | 4.00 | % |  | $ | 437,392 |  |  | 5.00 | %
S&T Bank | 938,377 |  |  | 10.73 | % |  | 349,746 |  |  | 4.00 | % |  | 437,182 |  |  | 5.00 | %
Common Equity Tier 1 ratio |  |  |  |  |  |  |  |  |  |  |
S&T | 938,708 |  |  | 12.81 | % |  | 329,701 |  |  | 4.50 | % |  | 476,235 |  |  | 6.50 | %
S&T Bank | 938,377 |  |  | 12.81 | % |  | 329,565 |  |  | 4.50 | % |  | 476,038 |  |  | 6.50 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 967,708 |  |  | 13.21 | % |  | 439,602 |  |  | 6.00 | % |  | 586,135 |  |  | 8.00 | %
S&T Bank | 938,377 |  |  | 12.81 | % |  | 439,420 |  |  | 6.00 | % |  | 585,893 |  |  | 8.00 | %
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 1,078,897 |  |  | 14.73 | % |  | 586,135 |  |  | 8.00 | % |  | 732,669 |  |  | 10.00 | %
S&T Bank | 1,049,566 |  |  | 14.33 | % |  | 585,893 |  |  | 8.00 | % |  | 732,367 |  |  | 10.00 | %

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- Definition Regulatory Capital Requirements Under Banking Regulations + References No definition available. + Details
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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B + Details
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