Parent Company Condensed Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
ASSETS
Cash	$ 244,820	$ 233,612
Investments in:
Other assets	262,342	266,416
Total Assets	9,657,972	9,551,526
LIABILITIES
Other liabilities	244,247	242,677
Total Liabilities	8,277,678	8,268,081
Total Shareholders’ Equity	1,380,294	1,283,445	$ 1,184,659	$ 1,206,454
Total Liabilities and Shareholders’ Equity	9,657,972	9,551,526
S&T
ASSETS
Cash	39,304	20,733
Investments in:
Bank subsidiary	1,352,177	1,268,441
Nonbank subsidiaries	4,169	4,658
Other assets	9,666	14,695
Total Assets	1,405,316	1,308,527
LIABILITIES
Long-term debt	24,515	24,474
Other liabilities	507	608
Total Liabilities	25,022	25,082
Total Shareholders’ Equity	1,380,294	1,283,445
Total Liabilities and Shareholders’ Equity	$ 1,405,316	$ 1,308,527