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		42,500,611
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)
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		0			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]
Proceeds from exercise of stock options, net of cash paid		380
Proceeds from exercise of stock options, net of cash paid	0		0
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)
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]
Proceeds from exercise of stock options, net of cash paid		380
Common Stock, Shares, Outstanding		42,627,286
Common Stock, Shares, Outstanding	49,243,813	49,243,813
Net income	$ 161,757						161,757
Other comprehensive income	$ (18,912)							(18,912)
Cash dividends declared per common share (in dollars per share)	$ 1.28
Common dividend declared	$ (61,564)						(61,564)
Stock based compensation	5,635					5,635
Restricted stock awards issued, net of awards surrendered		121,815
Restricted stock awards issued, net of awards surrendered	(2,189)		1			(2,190)
Shares issued under direct stock purchase plan		19,455
Shares issued under direct stock purchase plan	1,554					1,554
Stock Repurchased During Period, Shares		(1,766,457)
Stock Repurchased During Period, Value	(139,646)		(18)			(139,628)
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits				(56)	56
Increase (Decrease) in Deferred Compensation	0
Period End Balance at Jun. 30, 2026	3,512,363		473	(3,508)	3,508	2,201,250	1,369,306	(58,666)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		48,572,237
Net income	81,838						81,838
Other comprehensive income	$ (9,368)							(9,368)
Cash dividends declared per common share (in dollars per share)	$ 0.64
Common dividend declared	$ (30,478)						(30,478)
Stock based compensation	3,320					3,320
Restricted stock awards issued, net of awards surrendered		532
Restricted stock awards issued, net of awards surrendered	(59)					(59)
Shares issued under direct stock purchase plan		9,998
Shares issued under direct stock purchase plan	820					820
Stock Repurchased During Period, Shares		(964,141)
Stock Repurchased During Period, Value	(75,751)		(10)			(75,741)
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits				114	(114)
Increase (Decrease) in Deferred Compensation	0
Period End Balance at Jun. 30, 2026	$ 3,512,363		$ 473	$ (3,508)	$ 3,508	$ 2,201,250	$ 1,369,306	$ (58,666)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding	47,618,626	47,618,626