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		42,873,187
Net income	$ 99,100							$ 99,100
Other comprehensive income	$ 602								$ 602
Cash dividends declared per common share (in dollars per share)	$ 1.14
Common dividend declared	$ (48,406)							(48,406)
Stock based compensation	3,439					$ 3,439
Restricted stock awards issued, net of awards surrendered		105,313
Restricted stock awards issued, net of awards surrendered	(761)		$ 1			(762)
Shares issued under direct stock purchase plan		23,633
Shares issued under direct stock purchase plan	1,321		0			1,321
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				$ (55)	$ 55
Increase (Decrease) in Deferred Compensation	0
Period End Balance at Jun. 30, 2024	2,919,249		423	(3,353)	3,353	1,904,869		1,128,182	(114,225)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		42,452,457
Net income	51,330							51,330
Other comprehensive income	$ 5,113								5,113
Cash dividends declared per common share (in dollars per share)	$ 0.57
Common dividend declared	$ (24,209)							(24,209)
Stock based compensation	2,139					2,139
Restricted stock awards issued, net of awards surrendered		4,068
Restricted stock awards issued, net of awards surrendered	5		1			4
Shares issued under direct stock purchase plan		13,342
Shares issued under direct stock purchase plan	663					663
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits				50	(50)
Increase (Decrease) in Deferred Compensation	0
Period End Balance at Jun. 30, 2024	2,919,249		423	(3,353)	3,353	1,904,869		1,128,182	(114,225)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		42,469,867
Sales and Excise Tax Payable	$ 311
Common Stock, Shares, Outstanding	42,500,611	42,500,611
Net income	$ 95,525							95,525
Other comprehensive income	$ 31,924								31,924
Cash dividends declared per common share (in dollars per share)	$ 1.18
Common dividend declared	$ (50,290)							(50,290)
Proceeds from exercise of stock options, net of cash paid		380
Stock based compensation	4,844					4,844
Restricted stock awards issued, net of awards surrendered		108,588
Restricted stock awards issued, net of awards surrendered	(1,333)		1			(1,334)
Shares issued under direct stock purchase plan		17,707
Shares issued under direct stock purchase plan	1,066					1,066
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits				(76)	76
Increase (Decrease) in Deferred Compensation	0
Period End Balance at Jun. 30, 2025	3,074,856		424	(3,459)	3,459	1,914,556		1,217,959	(58,083)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		42,610,271
Net income	51,101							51,101
Other comprehensive income	$ 12,119								12,119
Cash dividends declared per common share (in dollars per share)	$ 0.59
Common dividend declared	$ (25,150)							(25,150)
Proceeds from exercise of stock options, net of cash paid		380
Stock based compensation	2,948					2,948
Restricted stock awards issued, net of awards surrendered		8,158
Restricted stock awards issued, net of awards surrendered	(25)					(25)
Shares issued under direct stock purchase plan		8,477
Shares issued under direct stock purchase plan	471					471
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits				65	(65)
Increase (Decrease) in Deferred Compensation	0
Period End Balance at Jun. 30, 2025	$ 3,074,856		$ 424	$ (3,459)	$ 3,459	$ 1,914,556		$ 1,217,959	$ (58,083)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding	42,627,286	42,627,286

[1] Inclusive of $311,000 impact of excise tax attributable to shares repurchased under a share repurchase program during the six months ended June 30, 2024