Share Repurchase Plan	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
SHARE REPURCHASE PLAN	SHARE REPURCHASE PLANOn March 15, 2021, our Board of Directors authorized an extension of its $50 million share repurchase plan, which was set to expire March 31, 2021. This authorization extended the expiration date of the repurchase plan through March 31, 2022. The plan permits S&T to repurchase from time to time up to the previously authorized $50 million in aggregate value of shares of S&T's common stock, with $37.4 million of capacity remaining at December 31, 2021, through a combination of open market and privately negotiated repurchases. The specific timing, price and quantity of repurchases will be at the discretion of S&T and will depend on a variety of factors, including general market conditions, the trading price of common stock, legal and contractual requirements, applicable securities laws and S&T's financial performance. The repurchase plan does not obligate us to repurchase any particular number of shares. We expect to fund any repurchases from cash on hand and internally generated funds. Any share repurchases will not begin until permissible under applicable laws. During the twelve months ended December 31, 2021, we had no repurchases. Repurchase activity was suspended in March of 2020 due to the impact of the COVID-19 pandemic.