CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning Balance at Dec. 31, 2020	$ 1,154,711	$ 103,623	$ 400,668	$ 710,061	$ 8,971	$ (68,612)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,902			31,902
Other comprehensive income (loss), net of tax	(7,910)				(7,910)
Cash dividends declared	(10,975)			(10,975)
Forfeitures of restricted stock, net of issuances	(135)			730		(865)
Recognition of restricted stock compensation expense	685		685
Ending Balance at Mar. 31, 2021	1,168,278	103,623	401,353	731,718	1,061	(69,477)
Beginning Balance at Dec. 31, 2021	1,206,454	103,623	403,095	773,659	(7,090)	(66,833)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29,143			29,143
Other comprehensive income (loss), net of tax	(39,953)				(39,953)
Cash dividends declared	(11,384)			(11,384)
Treasury stock issued for restricted stock awards, net of forfeitures	(56)			(73)		17
Recognition of restricted stock compensation expense	746		746
Ending Balance at Mar. 31, 2022	$ 1,184,950	$ 103,623	$ 403,841	$ 791,345	$ (47,043)	$ (66,816)