Loans and Allowance for Credit Losses - Allowance for Credit Losses on Loans by Category of Loan (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	$ 359,852	$ 345,209	$ 332,362	$ 281,576
Initial allowance on loans purchased with credit deterioration		9,694	26,078	76,793
Provision for credit losses			7,923	11,984
Charge-offs	(6,540)	(4,115)	(16,259)	(23,139)
Recoveries	1,085	707	4,293	4,281
Net (charge-offs) recoveries	(5,455)	(3,408)	(11,966)	(18,858)
Allowance for credit losses on loans, ending balance	354,397	351,495	354,397	351,495
Real Estate [Member] \| Construction, Land Development and Other Land Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	76,776	91,858	87,775	78,853
Initial allowance on loans purchased with credit deterioration		1,641	942	16,878
Provision for credit losses	(633)	1,437	(12,467)	(758)
Charge-offs	(378)		(486)	(77)
Recoveries		5	1	45
Net (charge-offs) recoveries	(378)	5	(485)	(32)
Allowance for credit losses on loans, ending balance	75,765	94,941	75,765	94,941
Real Estate [Member] \| Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	29,479	11,254	11,380	7,699
Initial allowance on loans purchased with credit deterioration			14,309	2,914
Provision for credit losses	(450)	149	3,577	706
Charge-offs	(109)		(631)	(113)
Recoveries	225		510	197
Net (charge-offs) recoveries	116		(121)	84
Allowance for credit losses on loans, ending balance	29,145	11,403	29,145	11,403
Real Estate [Member] \| 1-4 Family [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	80,689	67,722	77,652	60,795
Initial allowance on loans purchased with credit deterioration			344	1,590
Provision for credit losses	1,442	3,932	5,017	9,059
Charge-offs	(442)	(20)	(1,336)	(121)
Recoveries	33	98	45	409
Net (charge-offs) recoveries	(409)	78	(1,291)	288
Allowance for credit losses on loans, ending balance	81,722	71,732	81,722	71,732
Real Estate [Member] \| Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	95,728	86,765	88,664	66,272
Initial allowance on loans purchased with credit deterioration		4,290	4,306	25,292
Provision for credit losses	(921)	(4,554)	1,439	9,893
Charge-offs	(297)	(584)	(808)	(15,559)
Recoveries	39	14	948	33
Net (charge-offs) recoveries	(258)	(570)	140	(15,526)
Allowance for credit losses on loans, ending balance	94,549	85,931	94,549	85,931
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	70,112	81,970	59,832	62,319
Initial allowance on loans purchased with credit deterioration		3,763	6,176	30,095
Provision for credit losses	(2,216)	(2,455)	4,948	(10,448)
Charge-offs	(3,746)	(1,961)	(8,283)	(3,203)
Recoveries	437	367	1,914	2,921
Net (charge-offs) recoveries	(3,309)	(1,594)	(6,369)	(282)
Allowance for credit losses on loans, ending balance	64,587	81,684	64,587	81,684
Consumer and Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	7,068	5,640	7,059	5,638
Initial allowance on loans purchased with credit deterioration			1	24
Provision for credit losses	2,778	1,491	5,409	3,532
Charge-offs	(1,568)	(1,550)	(4,715)	(4,066)
Recoveries	351	223	875	676
Net (charge-offs) recoveries	(1,217)	(1,327)	(3,840)	(3,390)
Allowance for credit losses on loans, ending balance	$ 8,629	$ 5,804	$ 8,629	$ 5,804