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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 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 | %
As of December 31, 2015 |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |
S&T | $ | 535,234 |  | 8.96 | % |  | $ | 238,841 |  | 4.00 | % |  | $ | 298,551 |  | 5.00 | %
S&T Bank | 502,114 |  | 8.43 | % |  | 238,121 |  | 4.00 | % |  | 297,651 |  | 5.00 | %
Common Equity Tier 1 (to Risk-Weighted Assets) |  |  |  |  |  |  |  |
S&T | 515,234 |  | 9.77 | % |  | 237,315 |  | 4.50 | % |  | 342,788 |  | 6.50 | %
S&T Bank | 502,114 |  | 9.55 | % |  | 236,482 |  | 4.50 | % |  | 341,584 |  | 6.50 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |
S&T | 535,234 |  | 10.15 | % |  | 316,419 |  | 6.00 | % |  | 421,892 |  | 8.00 | %
S&T Bank | 502,114 |  | 9.55 | % |  | 315,309 |  | 6.00 | % |  | 420,412 |  | 8.00 | %
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |
S&T | 611,859 |  | 11.60 | % |  | 421,892 |  | 8.00 | % |  | 527,366 |  | 10.00 | %
S&T Bank | 577,824 |  | 11.00 | % |  | 420,412 |  | 8.00 | % |  | 525,515 |  | 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=35709795&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=35709795&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=35709795&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=35709795&loc=SL5958577-112826 + Details
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