Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	COMMON STOCK [Member]	CAPITAL SURPLUS [Member]	RETAINED EARNINGS [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]
Balance at beginning of period at Dec. 31, 2021		$ 32,603	$ 159,914	$ 977,067	$ 2,150
Shares issued for stock options		123	3,020
Net income	$ 35,915			35,915
Dividends on common stock				(11,782)
Stock-based compensation arrangements			458
Net change					(31,666)
Balance at end of period at Mar. 31, 2022	1,167,802	32,726	163,392	1,001,200	(29,516)
Balance at beginning of period at Dec. 31, 2022	1,250,836	32,876	169,231	1,120,292	(71,563)
Shares issued for stock options		24	618
Net income	57,533			57,533
Dividends on common stock				(13,160)
Stock-based compensation arrangements			382
Net change					(14,649)
Balance at end of period at Mar. 31, 2023	$ 1,310,882	$ 32,900	$ 170,231	$ 1,164,665	$ (56,914)