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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2017
Banking and Thrift [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, 2017 |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
S&T | $ | 628,876 |  |  | 9.17 | % |  | $ | 274,254 |  |  | 4.00 | % |  | $ | 342,818 |  |  | 5.00 | %
S&T Bank | 582,929 |  |  | 8.52 | % |  | 273,538 |  |  | 4.00 | % |  | 341,922 |  |  | 5.00 | %
Common Equity Tier 1 (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 608,876 |  |  | 10.71 | % |  | 255,778 |  |  | 4.50 | % |  | 369,457 |  |  | 6.50 | %
S&T Bank | 582,929 |  |  | 10.29 | % |  | 255,024 |  |  | 4.50 | % |  | 368,368 |  |  | 6.50 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 628,876 |  |  | 11.06 | % |  | 341,037 |  |  | 6.00 | % |  | 454,717 |  |  | 8.00 | %
S&T Bank | 582,929 |  |  | 10.29 | % |  | 340,032 |  |  | 6.00 | % |  | 453,375 |  |  | 8.00 | %
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 713,056 |  |  | 12.55 | % |  | 454,717 |  |  | 8.00 | % |  | 568,396 |  |  | 10.00 | %
S&T Bank | 666,560 |  |  | 11.76 | % |  | 453,375 |  |  | 8.00 | % |  | 566,719 |  |  | 10.00 | %
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
S&T | $ | 582,155 |  |  | 8.98 | % |  | $ | 259,170 |  |  | 4.00 | % |  | $ | 323,963 |  |  | 5.00 | %
S&T Bank | 542,048 |  |  | 8.39 | % |  | 258,460 |  |  | 4.00 | % |  | 323,075 |  |  | 5.00 | %
Common Equity Tier 1 (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 562,155 |  |  | 10.04 | % |  | 252,079 |  |  | 4.50 | % |  | 364,114 |  |  | 6.50 | %
S&T Bank | 542,048 |  |  | 9.71 | % |  | 251,213 |  |  | 4.50 | % |  | 362,864 |  |  | 6.50 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 582,155 |  |  | 10.39 | % |  | 336,105 |  |  | 6.00 | % |  | 448,140 |  |  | 8.00 | %
S&T Bank | 542,048 |  |  | 9.71 | % |  | 334,951 |  |  | 6.00 | % |  | 446,601 |  |  | 8.00 | %
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
S&T | 664,184 |  |  | 11.86 | % |  | 448,140 |  |  | 8.00 | % |  | 560,175 |  |  | 10.00 | %
S&T Bank | 622,469 |  |  | 11.15 | % |  | 446,602 |  |  | 8.00 | % |  | 558,252 |  |  | 10.00 | %

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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