Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Capital Stock [Member]	Surplus [Member]	Undivided Profits [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2023	$ 20,058	$ 257,181	$ 425,069	$ (13,237)	$ (43,786)	$ 645,285
Net income	0	0	12,126	0	0	12,126
Other comprehensive income (loss), net of tax	0	0	0	(1,526)	0	(1,526)
Stock Based Compensation Expense	0	154	0	0	0	154
Cash dividend declared	0	0	(6,849)	0	0	(6,849)
Balance at Mar. 31, 2024	20,058	257,335	430,346	(14,763)	(43,786)	649,190
Balance at Dec. 31, 2023	20,058	257,181	425,069	(13,237)	(43,786)	645,285
Net income						37,552
Other comprehensive income (loss), net of tax				6,637		6,637
Balance at Sep. 30, 2024	20,058	257,644	442,079	(6,600)	(44,160)	669,021
Balance at Mar. 31, 2024	20,058	257,335	430,346	(14,763)	(43,786)	649,190
Net income	0	0	12,551	0	0	12,551
Other comprehensive income (loss), net of tax	0	0	0	495	0	495
Stock Based Compensation Expense	0	155	0	0	0	155
Cash dividend declared	0	0	(6,849)	0	0	(6,849)
Purchase of treasury stock	0	0	0	0	(374)	(374)
Balance at Jun. 30, 2024	20,058	257,490	436,048	(14,268)	(44,160)	655,168
Net income	0	0	12,875	0	0	12,875
Other comprehensive income (loss), net of tax	0	0	0	7,668	0	7,668
Stock Based Compensation Expense	0	154	0	0	0	154
Cash dividend declared	0	0	(6,844)	0	0	(6,844)
Balance at Sep. 30, 2024	20,058	257,644	442,079	(6,600)	(44,160)	669,021
Balance at Dec. 31, 2024	20,097	258,874	446,503	(3,861)	(45,270)	676,343
Net income	0	0	14,275	0	0	14,275
Other comprehensive income (loss), net of tax	0	0	0	3,729	0	3,729
Stock Based Compensation Expense	0	308	0	0	0	308
Cash dividend declared	0	0	(6,847)	0	0	(6,847)
Balance at Mar. 31, 2025	20,097	259,182	453,931	(132)	(45,270)	687,808
Balance at Dec. 31, 2024	20,097	258,874	446,503	(3,861)	(45,270)	676,343
Net income						45,572
Other comprehensive income (loss), net of tax				6,816		6,816
Balance at Sep. 30, 2025	20,103	259,980	471,314	2,955	(62,339)	692,013
Balance at Mar. 31, 2025	20,097	259,182	453,931	(132)	(45,270)	687,808
Net income	0	0	15,039	0	0	15,039
Other comprehensive income (loss), net of tax	0	0	0	1,795	0	1,795
Stock Based Compensation Expense	0	308	0	0	0	308
Cash dividend declared	0	0	(6,812)	0	0	(6,812)
Purchase of treasury stock	0	0	0	0	(5,333)	(5,333)
Balance at Jun. 30, 2025	20,097	259,490	462,158	1,663	(50,603)	692,805
Net income	0	0	16,258	0	0	16,258
Other comprehensive income (loss), net of tax	0	0	0	1,292	0	1,292
Stock Based Compensation Expense	0	309	0	0	0	309
Exercise of stock option, net of repurchases	6	181	0	0	(198)	(11)
Cash dividend declared	0	0	(7,102)	0	0	(7,102)
Purchase of treasury stock	0	0	0	0	(11,538)	(11,538)
Balance at Sep. 30, 2025	$ 20,103	$ 259,980	$ 471,314	$ 2,955	$ (62,339)	$ 692,013