CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - 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, 2020	$ 1,469,955	$ 47,057	$ 846,922	$ 557,271	$ 18,705
Net income	235,107			235,107
Other comprehensive loss, net of tax	(27,244)				(27,244)
Comprehensive income	207,863
Common stock dividends	(60,351)			(60,351)
Stock compensation expense	5,299		5,299
Stock option plan	3,694	270	3,424
Employee stock purchase plan	2,064	60	2,004
Restricted stock vesting, net of tax withholding	(1,577)	82	(1,659)
Repurchase of common stock	(107,268)	(2,350)	(104,918)
Balance at end of period at Dec. 31, 2021	1,519,679	45,119	751,072	732,027	(8,539)
Net income	166,299			166,299
Other comprehensive loss, net of tax	(123,412)				(123,412)
Comprehensive income	42,887
Common stock dividends	(61,537)			(61,537)
Stock compensation expense	7,887		7,887
Stock option plan	293	14	279
Employee stock purchase plan	1,729	44	1,685
Restricted stock vesting, net of tax withholding	(2,183)	105	(2,288)
Repurchase of common stock	(24,987)	(625)	(24,362)
Balance at end of period at Dec. 31, 2022	1,483,768	44,657	734,273	836,789	(131,951)
Net income	122,844			122,844
Other comprehensive loss, net of tax	34,620				34,620
Comprehensive income	157,464
Common stock dividends	(61,317)			(61,317)
Stock compensation expense	7,631		7,631
Stock option plan	717	59	658
Employee stock purchase plan	1,540	65	1,475
Restricted stock vesting, net of tax withholding	(1,661)	133	(1,794)
Balance at end of period at Dec. 31, 2023	$ 1,588,142	$ 44,914	$ 742,243	$ 898,316	$ (97,331)