Consolidated Statements of Changes in Shareholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock	Surplus	Retained Earnings Cumulative Effect of Adoption of ASU	Retained Earnings	Accumulated Other Comprehensive Loss	Cumulative Effect of Adoption of ASU	Total
Balance at Dec. 31, 2023	$ 190,055	$ 4,240,413		$ 1,685,166	$ (582,536)		$ 5,533,098
Balance (in shares) at Dec. 31, 2023	76,022,039
Increase (Decrease) in Stockholders' Equity
Net income				115,056			115,056
Other comprehensive income (loss), net of tax effects					(40,458)		(40,458)
Comprehensive income							74,598
Cash dividends declared on common stock per share				(39,598)			(39,598)
Cash dividend equivalents paid on restricted stock units				(1,163)			(1,163)
Stock options exercised	$ 16	375					391
Stock options exercised (in shares)	6,349
Restricted stock awards (forfeits)	$ (1)	1
Restricted stock awards (forfeits) (in shares)	(64)
Stock issued pursuant to restricted stock units	$ 861	(861)
Stock issued pursuant to restricted stock units (in shares)	344,376
Common stock repurchased - buyback plan	$ (250)	(7,735)					(7,985)
Common stock repurchased - buyback plan (in shares)	(100,000)
Common stock repurchased - equity plans	$ (238)	(7,715)					(7,953)
Common stock repurchased - equity plans (in shares)	(95,537)
Share-based compensation expense		5,867					5,867
Balance (ASU 2023-02) at Mar. 31, 2024			$ (10,246)			$ (10,246)
Balance at Mar. 31, 2024	$ 190,443	4,230,345		1,749,215	(622,994)		5,547,009
Balance (in shares) at Mar. 31, 2024	76,177,163
Balance at Dec. 31, 2024	$ 190,805	4,259,722		2,046,809	(606,921)		$ 5,890,415
Balance (in shares) at Dec. 31, 2024	76,322,206						76,322,206
Increase (Decrease) in Stockholders' Equity
Net income				89,080			$ 89,080
Other comprehensive income (loss), net of tax effects					230,254		230,254
Comprehensive income							319,334
Cash dividends declared on common stock per share				(54,736)			(54,736)
Cash dividend equivalents paid on restricted stock units				(1,100)			(1,100)
Stock options exercised	$ 18	312					330
Stock options exercised (in shares)	6,976
Stock issued pursuant to restricted stock units	$ 1,000	(1,000)
Stock issued pursuant to restricted stock units (in shares)	399,961
Stock issued in lieu of cash - directors fees	$ 2	91					93
Stock issued in lieu of cash - directors fees (in shares)	903
Common stock repurchased - equity plans	$ (274)	(10,902)					(11,176)
Common stock repurchased - equity plans (in shares)	(109,712)
Share-based compensation expense		8,254					8,254
Common stock issued for Independent acquisition	$ 62,147	2,410,800					2,472,947
Common stock issued for Independent acquisition (in shares)	24,858,731
Balance at Mar. 31, 2025	$ 253,698	$ 6,667,277		$ 2,080,053	$ (376,667)		$ 8,624,361
Balance (in shares) at Mar. 31, 2025	101,479,065						101,479,065