Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Deferred Benefits for Directors [Member]
Beginning Balance at Dec. 31, 2022	$ 2,426,662	$ 144,484	$ 141,834	$ 1,635,877	$ 1,077,675	$ (308,964)	$ (262,416)	$ (1,828)
Beginning Balance, shares at Dec. 31, 2022			59,198,963
Net income	42,341				42,341
Other comprehensive loss	28,017						28,017
Comprehensive income	70,358
Common dividends declared	(20,561)				(20,561)
Preferred dividends declared	(2,531)				(2,531)
Stock issued for dividend reinvestment					0	0
Stock issued for dividend reinvestment, shares			0
Treasury shares acquired	(52)					(52)
Treasury shares acquired, shares			(1,394)
Stock options exercised	103			(34)		137
Stock options exercised, shares			4,441
Restricted stock granted				(1,372)		1,372
Restricted stock granted, shares			44,559
Stock compensation expense	1,585			1,585
Deferred benefits for directors- net	(107)			5				(112)
Ending Balance at Mar. 31, 2023	2,475,457	144,484	$ 141,834	1,636,061	1,096,924	(307,507)	(234,399)	(1,940)
Ending Balance, shares at Mar. 31, 2023			59,246,569
Beginning Balance at Dec. 31, 2023	2,533,062	144,484	$ 141,834	1,635,859	1,142,586	(302,995)	(226,693)	(2,013)
Beginning Balance, shares at Dec. 31, 2023			59,376,435
Net income	35,693				35,693
Other comprehensive loss	(8,229)						(8,229)
Comprehensive income	27,464
Common dividends declared	(21,179)				(21,179)
Preferred dividends declared	(2,531)				(2,531)
Stock issued for dividend reinvestment					(262)	262
Stock issued for dividend reinvestment, shares			7,180
Treasury shares acquired	(86)					(86)
Treasury shares acquired, shares			(3,033)
Stock options exercised	100			(74)		174
Stock options exercised, shares			4,764
Restricted stock granted				(381)		381
Restricted stock granted, shares			10,431
Stock compensation expense	1,547			1,547
Deferred benefits for directors- net	(15)			13				(28)
Ending Balance at Mar. 31, 2024	$ 2,538,362	$ 144,484	$ 141,834	$ 1,636,964	$ 1,154,307	$ (302,264)	$ (234,922)	$ (2,041)
Ending Balance, shares at Mar. 31, 2024			59,395,777