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	87,221				87,221
Other comprehensive loss	(2,211)						(2,211)
Comprehensive income	85,010
Common dividends declared	(41,145)				(41,145)
Preferred dividends declared	(5,063)				(5,063)
Stock issued for dividend reinvestment					(553)	553
Stock issued for dividend reinvestment, shares			15,180
Treasury shares acquired	(3,749)					(3,749)
Treasury shares acquired, shares			(162,700)
Stock options exercised	126			(46)		172
Stock options exercised, shares			5,491
Restricted stock granted				(8,218)		8,218
Restricted stock granted, shares			298,128
Stock compensation expense	3,334			3,334
Deferred benefits for directors- net	(177)			16				(193)
Ending Balance at Jun. 30, 2023	2,464,998	144,484	$ 141,834	1,630,963	1,118,135	(303,770)	(264,627)	(2,021)
Ending Balance, shares at Jun. 30, 2023			59,355,062
Beginning Balance at Mar. 31, 2023	2,475,457	144,484	$ 141,834	1,636,061	1,096,924	(307,507)	(234,399)	(1,940)
Beginning Balance, shares at Mar. 31, 2023			59,246,569
Net income	44,880				44,880
Other comprehensive loss	(30,228)						(30,228)
Comprehensive income	14,652
Common dividends declared	(20,585)				(20,585)
Preferred dividends declared	(2,531)				(2,531)
Stock issued for dividend reinvestment					(553)	553
Stock issued for dividend reinvestment, shares			15,180
Treasury shares acquired	(3,697)					(3,697)
Treasury shares acquired, shares			(161,306)
Stock options exercised	23			(12)		35
Stock options exercised, shares			1,050
Restricted stock granted				(6,846)		6,846
Restricted stock granted, shares			253,569
Stock compensation expense	1,749			1,749
Deferred benefits for directors- net	(70)			11				(81)
Ending Balance at Jun. 30, 2023	2,464,998	144,484	$ 141,834	1,630,963	1,118,135	(303,770)	(264,627)	(2,021)
Ending Balance, shares at Jun. 30, 2023			59,355,062
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	64,609				64,609
Other comprehensive loss	(8,515)						(8,515)
Comprehensive income	56,094
Common dividends declared	(42,392)				(42,392)
Preferred dividends declared	(5,063)				(5,063)
Stock issued for dividend reinvestment					(523)	523
Stock issued for dividend reinvestment, shares			14,058
Treasury shares acquired	(1,441)					(1,441)
Treasury shares acquired, shares			(49,729)
Stock options exercised	176			(126)		302
Stock options exercised, shares			8,139
Restricted stock granted				(8,793)		8,793
Restricted stock granted, shares			230,407
Stock compensation expense	3,867			3,867
Deferred benefits for directors- net	(24)			23				(47)
Ending Balance at Jun. 30, 2024	2,544,279	144,484	$ 141,834	1,630,830	1,159,217	(294,818)	(235,208)	(2,060)
Ending Balance, shares at Jun. 30, 2024			59,579,310
Beginning Balance at Mar. 31, 2024	2,538,362	144,484	$ 141,834	1,636,964	1,154,307	(302,264)	(234,922)	(2,041)
Beginning Balance, shares at Mar. 31, 2024			59,395,777
Net income	28,916				28,916
Other comprehensive loss	(286)						(286)
Comprehensive income	28,630
Common dividends declared	(21,214)				(21,214)
Preferred dividends declared	(2,531)				(2,531)
Stock issued for dividend reinvestment					(261)	261
Stock issued for dividend reinvestment, shares			6,878
Treasury shares acquired	(1,355)					(1,355)
Treasury shares acquired, shares			(46,696)
Stock options exercised	76			(52)		128
Stock options exercised, shares			3,375
Restricted stock granted				(8,412)		8,412
Restricted stock granted, shares			219,976
Stock compensation expense	2,320			2,320
Deferred benefits for directors- net	(9)			10				(19)
Ending Balance at Jun. 30, 2024	$ 2,544,279	$ 144,484	$ 141,834	$ 1,630,830	$ 1,159,217	$ (294,818)	$ (235,208)	$ (2,060)
Ending Balance, shares at Jun. 30, 2024			59,579,310