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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
S&T | $ | 825,515 |  |  | 9.43 % |  | $ | 350,311 |  |  | 4.00 % |  | $ | 437,889 |  |  | 5.00 %
S&T Bank | 810,636 |  |  | 9.27 % |  | 349,739 |  |  | 4.00 % |  | 437,174 |  |  | 5.00 %
Common Equity Tier 1 (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 796,515 |  |  | 11.33 % |  | 316,338 |  |  | 4.50 % |  | 456,933 |  |  | 6.50 %
S&T Bank | 810,636 |  |  | 11.55 % |  | 315,792 |  |  | 4.50 % |  | 456,144 |  |  | 6.50 %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 825,515 |  |  | 11.74 % |  | 421,784 |  |  | 6.00 % |  | 562,379 |  |  | 8.00 %
S&T Bank | 810,636 |  |  | 11.55 % |  | 421,056 |  |  | 6.00 % |  | 561,408 |  |  | 8.00 %
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 944,686 |  |  | 13.44 % |  | 562,379 |  |  | 8.00 % |  | 702,974 |  |  | 10.00 %
S&T Bank | 922,007 |  |  | 13.14 % |  | 561,408 |  |  | 8.00 % |  | 701,760 |  |  | 10.00 %
As of December 31, 2019 |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
S&T | $ | 854,146 |  |  | 10.29 | % |  | $ | 331,925 |  |  | 4.00 | % |  | $ | 414,907 |  |  | 5.00 | %
S&T Bank | 832,113 |  |  | 10.04 | % |  | 331,355 |  |  | 4.00 | % |  | 414,194 |  |  | 5.00 | %
Common Equity Tier 1 (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 825,146 |  |  | 11.43 | % |  | 324,745 |  |  | 4.50 | % |  | 469,077 |  |  | 6.50 | %
S&T Bank | 832,113 |  |  | 11.56 | % |  | 324,048 |  |  | 4.50 | % |  | 468,069 |  |  | 6.50 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 854,146 |  |  | 11.84 | % |  | 432,994 |  |  | 6.00 | % |  | 577,325 |  |  | 8.00 | %
S&T Bank | 832,113 |  |  | 11.56 | % |  | 432,064 |  |  | 6.00 | % |  | 576,085 |  |  | 8.00 | %
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 954,094 |  |  | 13.22 | % |  | 577,325 |  |  | 8.00 | % |  | 721,656 |  |  | 10.00 | %
S&T Bank | 922,310 |  |  | 12.81 | % |  | 576,085 |  |  | 8.00 | % |  | 720,106 |  |  | 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 -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://www.xbrl.org/2003/role/disclosureRef -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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