CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Shares	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance at Dec. 31, 2021	$ 845,025	$ 686,282	$ 207,076	$ (11,619)	$ (36,714)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,577		23,577
Other comprehensive gain (loss), net of tax	(51,048)			(51,048)
Cash dividends declared	(10,176)		(10,176)
Reissuance of treasury stock for common share awards	0	(3,998)			3,998
Repurchase of treasury stock in connection with employee incentive program and compensation plan for Boards of Directors	(1,230)				(1,230)
Common shares issued under dividend reinvestment plan	305	305
Common shares issued under compensation plan for Boards of Directors	124	31			93
Common shares issued under employee stock purchase plan	186	46			140
Stock-based compensation	1,577	1,577
Ending balance at Mar. 31, 2022	808,340	684,243	220,477	(62,667)	(33,713)
Beginning balance at Dec. 31, 2022	785,328	686,450	265,936	(127,136)	(39,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,560		26,560
Other comprehensive gain (loss), net of tax	16,157			16,157
Cash dividends declared	(10,725)		(10,725)
Reissuance of treasury stock for common share awards	0	(4,685)			4,685
Repurchase of treasury stock in connection with employee incentive program and compensation plan for Boards of Directors	(920)				(920)
Common shares issued under dividend reinvestment plan	402	402
Common shares issued under compensation plan for Boards of Directors	136	8			128
Common shares issued under employee stock purchase plan	455	42			413
Stock-based compensation	2,150	2,150
Ending balance at Mar. 31, 2023	$ 819,543	$ 684,367	$ 281,771	$ (110,979)	$ (35,616)