Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2021	$ 1,741,311	$ 12,845	$ 175,913	$ 1,585,113	$ (32,560)
Balance (in shares) at Dec. 31, 2021		61,648,679
Net Income (Loss)	71,887			71,887
Other comprehensive income (loss), net of tax	(242,843)				(242,843)
Cash dividends paid on common stock ($0.92 per share)	(56,679)			(56,679)
Shares withheld to pay taxes, long-term incentive plan	(1,687)	$ 24	(1,711)
Shares withheld to pay taxes, long-term incentive plan (in shares)		118,398
Repurchase and retirement of common stock	(24,604)	$ (164)	(24,440)
Repurchase and retirement of common stock (in shares)		(789,391)
Compensation expense, long-term incentive plan	4,883		4,883
Balance at Dec. 31, 2022	1,492,268	$ 12,705	154,645	1,600,321	(275,403)
Balance (in shares) at Dec. 31, 2022		60,977,686
Net Income (Loss)	165,489			165,489
Other comprehensive income (loss), net of tax	55,680				55,680
Cash dividends paid on common stock ($0.92 per share)	(56,653)			(56,653)
Shares withheld to pay taxes, long-term incentive plan	(1,092)	$ 20	(1,112)
Shares withheld to pay taxes, long-term incentive plan (in shares)		93,487
Compensation expense, long-term incentive plan	6,155		6,155
Balance at Dec. 31, 2023	$ 1,661,847	$ 12,725	159,688	1,709,157	(219,723)
Balance (in shares) at Dec. 31, 2023	61,071,173	61,071,173
Net Income (Loss)	$ 223,009			223,009
Other comprehensive income (loss), net of tax	136,064				136,064
Cash dividends paid on common stock ($0.92 per share)	(56,790)			(56,790)
Shares withheld to pay taxes, long-term incentive plan	(1,519)	$ 29	(1,548)
Shares withheld to pay taxes, long-term incentive plan (in shares)		140,003
Repurchase and retirement of common stock	(7,499)	$ (43)	(7,456)
Repurchase and retirement of common stock (in shares)		(203,153)
Compensation expense, long-term incentive plan	7,215		7,215
Balance at Dec. 31, 2024	$ 1,962,327	$ 12,711	$ 157,899	$ 1,875,376	$ (83,659)
Balance (in shares) at Dec. 31, 2024	61,008,023	61,008,023