CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - UNAUDITED - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income/ (Loss)
Balance at beginning of period at Dec. 31, 2022	$ 1,483,768	$ 44,657	$ 734,273	$ 836,789	$ (131,951)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	51,253			51,253
Other comprehensive loss, net of tax	15,960				15,960
Comprehensive income	67,213
Common stock dividends	(15,407)			(15,407)
Stock compensation expense	1,241		1,241
Stock option plan	151	7	144
Employee stock purchase plan	411	12	399
Restricted stock vesting, net of tax withholding	(512)	36	(548)
Balance at end of period at Mar. 31, 2023	1,536,865	44,712	735,509	872,635	(115,991)
Balance at beginning of period at Dec. 31, 2023	1,588,142	44,914	742,243	898,316	(97,331)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,372			20,372
Other comprehensive loss, net of tax	(5,472)				(5,472)
Comprehensive income	14,900
Common stock dividends	(15,311)			(15,311)
Stock compensation expense	1,230		1,230
Stock option plan	109	10	99
Employee stock purchase plan	351	16	335
Restricted stock vesting, net of tax withholding	(57)	0	(57)
Balance at end of period at Mar. 31, 2024	$ 1,589,364	$ 44,940	$ 743,850	$ 903,377	$ (102,803)