CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss)	Treasury Stock [Member]
Common stock, shares outstanding at Dec. 31, 2022		17,183,000
Shareholders' equity at Dec. 31, 2022	$ 453,669	$ 1,085	$ 127,056	$ 492,043	$ (157,800)	$ (8,715)
Net income	35,229			35,229
Total other comprehensive income (loss), net of tax	(20,934)				(20,934)
Cash dividends declared	(28,751)			(28,751)
Share-based compensation	1,569		1,569
Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, shares		36,000
Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, value	(637)	$ 0	(2,315)			1,678
Treasury stock repurchased		(200,000)
Treasury stock purchased under Stock Repurchase Program, amount acquired	(8,741)					(8,741)
Common stock, shares outstanding at Sep. 30, 2023		17,019,000
Shareholders' equity at Sep. 30, 2023	431,404	$ 1,085	126,310	498,521	(178,734)	(15,778)
Common stock, shares outstanding at Jun. 30, 2023		17,019,000
Shareholders' equity at Jun. 30, 2023	459,161	$ 1,085	125,685	496,996	(148,827)	(15,778)
Net income	11,161			11,161
Total other comprehensive income (loss), net of tax	(29,907)				(29,907)
Cash dividends declared	(9,636)			(9,636)
Share-based compensation	624		624
Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, shares		0
Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, value	1	$ 0	1			0
Common stock, shares outstanding at Sep. 30, 2023		17,019,000
Shareholders' equity at Sep. 30, 2023	$ 431,404	$ 1,085	126,310	498,521	(178,734)	(15,778)
Common stock, shares outstanding at Dec. 31, 2023	17,030,987	17,031,000
Shareholders' equity at Dec. 31, 2023	$ 472,686	$ 1,085	126,150	501,917	(141,153)	(15,313)
Net income	32,732			32,732
Total other comprehensive income (loss), net of tax	23,995				23,995
Cash dividends declared	(28,995)			(28,995)
Share-based compensation	2,078		2,078
Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, shares		27,000
Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, value	$ (267)	$ 0	(1,530)			1,263
Common stock, shares outstanding at Sep. 30, 2024	17,058,413	17,058,000
Shareholders' equity at Sep. 30, 2024	$ 502,229	$ 1,085	126,698	505,654	(117,158)	(14,050)
Common stock, shares outstanding at Jun. 30, 2024		17,058,000
Shareholders' equity at Jun. 30, 2024	470,957	$ 1,085	125,898	504,350	(146,326)	(14,050)
Net income	10,981			10,981
Total other comprehensive income (loss), net of tax	29,168				29,168
Cash dividends declared	(9,677)			(9,677)
Share-based compensation	$ 800		800
Common stock, shares outstanding at Sep. 30, 2024	17,058,413	17,058,000
Shareholders' equity at Sep. 30, 2024	$ 502,229	$ 1,085	$ 126,698	$ 505,654	$ (117,158)	$ (14,050)