Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2024

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, 2024
Leverage Ratio
S&T	$	1,112,126	11.98	%	$	371,211	4.00	%	$	464,014	5.00	%
S&T Bank	1,060,010		11.43	%	371,002		4.00	%	463,752		5.00	%
Common Equity Tier 1 ratio
S&T	1,088,126		14.58	%	335,888		4.50	%	485,172		6.50	%
S&T Bank	1,060,010		14.21	%	335,722		4.50	%	484,932		6.50	%
Tier 1 Capital (to Risk-Weighted Assets)
S&T	1,112,126		14.90	%	447,851		6.00	%	597,134		8.00	%
S&T Bank	1,060,010		14.21	%	447,629		6.00	%	596,839		8.00	%
Total Capital (to Risk-Weighted Assets)
S&T	1,230,497		16.49	%	597,134		8.00	%	746,418		10.00	%
S&T Bank	1,178,335		15.79	%	596,839		8.00	%	746,049		10.00	%
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	%