Condensed Financial Information - Parent Company - Condensed Statements of Earnings (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income:
Total interest income		$ 628,918	$ 528,070	$ 432,854
Expenses:
Salaries and employee benefits		153,296	131,915	134,133
Earnings before income taxes		271,846	243,299	280,874
Income tax benefit		48,335	44,322	46,399
NET EARNINGS		223,511	198,977	234,475
Parent Company [Member]
Income:
Cash dividends from subsidiaries	[1]	55,500	133,500	67,500
Excess of earnings over dividends of subsidiaries	[1]	177,467	72,444	174,741
Other		2,002	1,783	62
Total interest income		234,969	207,727	242,303
Expenses:
Salaries and employee benefits		9,314	6,129	6,541
Other operating expenses		4,791	4,521	4,106
Total expense		14,105	10,650	10,647
Earnings before income taxes		220,864	197,077	231,656
Income tax benefit		2,647	1,900	2,819
NET EARNINGS		$ 223,511	$ 198,977	$ 234,475

[1] Eliminates in consolidation