CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Impact of adopting ASU 2022-02	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Impact of adopting ASU 2022-02	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
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	0				(135)			135
Forfeitures of restricted stock awards	(56)				62			(118)
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)
Beginning Balance at Dec. 31, 2021	1,206,454		103,623	403,095	773,659		(7,090)	(66,833)
Ending Balance at Dec. 31, 2022	$ 1,184,659	$ (447)	103,623	406,283	863,948	$ (447)	(112,125)	(77,070)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2022-02 [Member]
Net income	$ 39,799				39,799
Other comprehensive income (loss), net of tax	15,467						15,467
Cash dividends declared	(12,494)				(12,494)
Forfeitures of restricted stock awards	(19)				34			(53)
Recognition of restricted stock compensation expense	830			830
Ending Balance at Mar. 31, 2023	$ 1,227,795		$ 103,623	$ 407,113	$ 890,840		$ (96,658)	$ (77,123)