CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Common stock, shares outstanding, beginning balance at Dec. 31, 2019			17,363,000
Stockholders' equity, beginning balance at Dec. 31, 2019	$ 503,492		$ 1,085	$ 123,281	$ 390,363		$ (11,237)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	69,829				69,829
Total other comprehensive income (loss), net of tax	3,846						3,846
Cash dividends declared	(35,838)				(35,838)
Share-based compensation	3,766			3,766
Exercise of stock options, issuance of other compensation-related equity awards, net of awards surrendered, shares			27,000
Exercise of stock options, issuance of other compensation-related equity awards, net of awards surrendered	$ (470)		$ 0	(1,437)				967
Treasury shares purchased, shares	(125,000)
Treasury stock purchased	$ (4,322)							(4,322)
Common stock, shares outstanding, ending balance at Dec. 31, 2020			17,265,000
Stockholders' equity, ending balance at Dec. 31, 2020	534,195	$ (6,108)	$ 1,085	125,610	418,246	$ (6,108)	(7,391)	(3,355)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76,870				76,870
Total other comprehensive income (loss), net of tax	(12,590)						(12,590)
Cash dividends declared	(36,806)				(36,806)
Share-based compensation	3,316			3,316
Exercise of stock options, issuance of other compensation-related equity awards, net of awards surrendered, shares			66,000
Exercise of stock options, issuance of other compensation-related equity awards, net of awards surrendered	$ (177)		$ 0	(2,415)				2,238
Common stock, shares outstanding, ending balance at Dec. 31, 2021	17,330,818		17,331,000
Stockholders' equity, ending balance at Dec. 31, 2021	$ 564,808		$ 1,085	126,511	458,310		(19,981)	(1,117)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	71,681				71,681
Total other comprehensive income (loss), net of tax	(137,819)						(137,819)
Cash dividends declared	(37,948)				(37,948)
Share-based compensation	3,247			3,247
Exercise of stock options, issuance of other compensation-related equity awards, net of awards surrendered, shares			46,000
Exercise of stock options, issuance of other compensation-related equity awards, net of awards surrendered	$ (821)			(2,702)				1,881
Treasury shares purchased, shares	(194,000)
Treasury stock purchased	$ (9,479)							(9,479)
Common stock, shares outstanding, ending balance at Dec. 31, 2022	17,182,753		17,183,000
Stockholders' equity, ending balance at Dec. 31, 2022	$ 453,669		$ 1,085	$ 127,056	$ 492,043		$ (157,800)	$ (8,715)