Regulatory Matters (Tables)

12 Months Ended

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	%