Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock Outstanding	Common Stock	Value of Shares Held in Rabbi Trust at Cost	Deferred Compensation and Other Retirement Benefit Obligations	Additional Paid in Capital		Retained Earnings	Accumulated Other Comprehensive Income/(Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		45,641,238
Net income	$ 61,247							$ 61,247
Other comprehensive income	27,139								$ 27,139
Cash dividends declared per common share (in dollars per share)								$ 0.55
Common dividend declared	(24,351)							$ (24,351)
Proceeds from exercise of stock options, net of cash paid		1,666
Stock Repurchased During Period, Value, as a result of Stock Options Exercised	80					$ 80
Stock based compensation	1,672					1,672
Restricted stock awards issued, net of awards surrendered		81,075
Restricted stock awards issued, net of awards surrendered	(1,110)		$ 0			(1,110)
Shares issued under direct stock purchase plan		7,881
Shares issued under direct stock purchase plan	642		0			642
Stock Repurchased During Period, Shares		(1,617,033)
Stock Repurchased During Period, Value	(121,111)		(16)			(121,095)
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits				$ (59)	$ 59
Increase (Decrease) in Deferred Compensation	0
Period End Balance at Mar. 31, 2023	2,830,909		439	(3,286)	3,286	1,995,077		971,338	(135,945)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from exercise of stock options, net of cash paid			0
Common Stock, Shares, Outstanding		44,114,827
Sales and Excise Tax Payable	$ 1,200
Common Stock, Shares, Outstanding	42,873,187	42,873,187
Net income	$ 47,770							$ 47,770
Other comprehensive income	(4,511)								(4,511)
Cash dividends declared per common share (in dollars per share)								$ 0.57
Common dividend declared	(24,197)							$ (24,197)
Stock based compensation	1,300					1,300
Restricted stock awards issued, net of awards surrendered		101,245
Restricted stock awards issued, net of awards surrendered	(766)					(766)
Shares issued under direct stock purchase plan		10,291
Shares issued under direct stock purchase plan	658					658
Stock Repurchased During Period, Shares		(532,266)
Stock Repurchased During Period, Value	(31,297)		(5)			(31,292)	[1]
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits				(105)	105
Increase (Decrease) in Deferred Compensation	0
Period End Balance at Mar. 31, 2024	$ 2,884,208		$ 422	$ (3,403)	$ 3,403	$ 1,902,063		$ 1,101,061	$ (119,338)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding	42,452,457	42,452,457
Sales and Excise Tax Payable	$ 278

[1] Inclusive of $278,000 and $1.2 million impact of excise tax attributable to shares repurchased under the share repurchase program during the three months ended March 31, 2024 and March 31, 2023, respectively