UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings- Substantially Restricted	Accumulated Other Compre- hensive (Loss) Income
Balance, beginning (in shares) at Dec. 31, 2022		110,777,780
Balance, beginning at Dec. 31, 2022	$ 2,843,305	$ 1,108	$ 2,344,005	$ 966,984	$ (468,792)
Increase (Decrease) in Stockholders' Equity
Net income	168,611			168,611
Other comprehensive income (loss)	(31,575)				(31,575)
Cash dividends declared	(110,048)			(110,048)
Stock issuances under stock incentive plans (in shares)		101,585
Stock issuances under stock incentive plans	0	$ 1	(1)
Stock-based compensation and related taxes	4,301		4,301
Balance, ending (in shares) at Sep. 30, 2023		110,879,365
Balance, ending at Sep. 30, 2023	2,874,594	$ 1,109	2,348,305	1,025,547	(500,367)
Balance, beginning (in shares) at Jun. 30, 2023		110,873,887
Balance, beginning at Jun. 30, 2023	2,926,526	$ 1,109	2,346,422	1,009,782	(430,787)
Increase (Decrease) in Stockholders' Equity
Net income	52,445			52,445
Other comprehensive income (loss)	(69,580)				(69,580)
Cash dividends declared	(36,680)			(36,680)
Stock issuances under stock incentive plans (in shares)		5,478
Stock-based compensation and related taxes	1,883		1,883
Balance, ending (in shares) at Sep. 30, 2023		110,879,365
Balance, ending at Sep. 30, 2023	$ 2,874,594	$ 1,109	2,348,305	1,025,547	(500,367)
Balance, beginning (in shares) at Dec. 31, 2023	110,888,942	110,888,942
Balance, beginning at Dec. 31, 2023	$ 3,020,281	$ 1,109	2,350,104	1,043,181	(374,113)
Increase (Decrease) in Stockholders' Equity
Net income	128,390			128,390
Other comprehensive income (loss)	111,807				111,807
Cash dividends declared	(112,549)			(112,549)
Stock issued in connection with acquisitions (in shares)		2,389,684
Stock issued in connection with acquisitions	92,385	$ 24	92,361
Stock issuances under stock incentive plans (in shares)		116,160
Stock issuances under stock incentive plans	0	$ 1	(1)
Stock-based compensation and related taxes	$ 4,736		4,736
Balance, ending (in shares) at Sep. 30, 2024	113,394,786	113,394,786
Balance, ending at Sep. 30, 2024	$ 3,245,050	$ 1,134	2,447,200	1,059,022	(262,306)
Balance, beginning (in shares) at Jun. 30, 2024		113,394,092
Balance, beginning at Jun. 30, 2024	3,137,445	$ 1,134	2,445,479	1,045,483	(354,651)
Increase (Decrease) in Stockholders' Equity
Net income	51,055			51,055
Other comprehensive income (loss)	92,345				92,345
Cash dividends declared	(37,516)			(37,516)
Stock issuances under stock incentive plans (in shares)		694
Stock-based compensation and related taxes	$ 1,721		1,721
Balance, ending (in shares) at Sep. 30, 2024	113,394,786	113,394,786
Balance, ending at Sep. 30, 2024	$ 3,245,050	$ 1,134	$ 2,447,200	$ 1,059,022	$ (262,306)