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) [Member]	Treasury Stock [Member]
Common stock, shares outstanding at Dec. 31, 2020		17,265,000
Shareholders' equity at Dec. 31, 2020	$ 534,195	$ 1,085	$ 125,610	$ 418,246	$ (7,391)	$ (3,355)
Net income	20,471			20,471
Total other comprehensive income (loss), net of tax	(12,615)				(12,615)
Cash dividends declared	(9,119)			(9,119)
Share-based compensation	918		918
Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, shares		41,000
Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, value	(251)	$ 0	(1,646)			1,395
Common stock, shares outstanding at Mar. 31, 2021		17,306,000
Shareholders' equity at Mar. 31, 2021	$ 533,599	$ 1,085	124,882	429,598	(20,006)	(1,960)
Common stock, shares outstanding at Dec. 31, 2021	17,330,818	17,331,000
Shareholders' equity at Dec. 31, 2021	$ 564,808	$ 1,085	126,511	458,310	(19,981)	(1,117)
Net income	16,483			16,483
Total other comprehensive income (loss), net of tax	(59,470)				(59,470)
Cash dividends declared	(9,498)			(9,498)
Share-based compensation	888		888
Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, shares		1,000
Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, value	$ (19)	$ 0	(44)			25
Common stock, shares outstanding at Mar. 31, 2022	17,331,555	17,332,000
Shareholders' equity at Mar. 31, 2022	$ 513,192	$ 1,085	$ 127,355	$ 465,295	$ (79,451)	$ (1,092)