CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance at beginning of period at Dec. 31, 2024	$ 1,380,294	$ 103,623	$ 411,785	$ 1,039,035	$ (76,992)	$ (97,157)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,401			33,401
Other comprehensive income, net of tax	16,357				16,357
Cash dividends declared	(13,069)			(13,069)
Treasury stock issued for restricted stock awards	(41)		(90)			49
Recognition of restricted stock compensation expense	1,092		1,092
Balance at end of period at Mar. 31, 2025	1,418,034	103,623	412,787	1,059,367	(60,635)	(97,108)
Balance at beginning of period at Dec. 31, 2025	1,463,877	103,623	412,969	1,120,297	(41,707)	(131,305)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,072			35,072
Other comprehensive income, net of tax	(5,769)				(5,769)
Cash dividends declared	(13,406)			(13,406)
Treasury stock issued for restricted stock awards	(28)		(149)			121
Repurchase of S&T Stock	(50,174)					(50,174)
Recognition of restricted stock compensation expense	1,109		1,109
Balance at end of period at Mar. 31, 2026	$ 1,430,681	$ 103,623	$ 413,929	$ 1,141,963	$ (47,476)	$ (181,358)