Loans and Allowance for Credit Losses - Allowance for Credit Losses on Loans by Category of Loan (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	$ 349,101	$ 330,219	$ 351,805	$ 332,362
Initial allowance on loans purchased with credit deterioration		26,078		26,078
Provision for credit losses	0	7,923		7,923
Charge-offs	(4,222)	(6,117)	(8,165)	(9,718)
Recoveries	1,205	1,749	2,444	3,207
Net (charge-offs) recoveries	(3,017)	(4,368)	(5,721)	(6,511)
Allowance for credit losses on loans, ending balance	346,084	359,852	346,084	359,852
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	80,580	82,158	77,984	87,775
Initial allowance on loans purchased with credit deterioration		942		942
Provision for credit losses	(2,765)	(6,215)	(325)	(11,834)
Charge-offs	(82)	(109)	(82)	(109)
Recoveries	85		241	2
Net (charge-offs) recoveries	3	(109)	159	(107)
Allowance for credit losses on loans, ending balance	77,818	76,776	77,818	76,776
Real Estate [Member] \| Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	26,097	12,627	27,693	11,380
Initial allowance on loans purchased with credit deterioration		14,309		14,309
Provision for credit losses	737	2,757	(859)	4,027
Charge-offs	(37)	(400)	(37)	(522)
Recoveries	51	186	51	285
Net (charge-offs) recoveries	14	(214)	14	(237)
Allowance for credit losses on loans, ending balance	26,848	29,479	26,848	29,479
Real Estate [Member] \| 1-4 Family [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	83,895	79,664	80,735	77,652
Initial allowance on loans purchased with credit deterioration		344		344
Provision for credit losses	(1,448)	1,106	2,763	3,575
Charge-offs	(410)	(433)	(1,468)	(894)
Recoveries	68	8	75	12
Net (charge-offs) recoveries	(342)	(425)	(1,393)	(882)
Allowance for credit losses on loans, ending balance	82,105	80,689	82,105	80,689
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	90,307	87,213	92,147	88,664
Initial allowance on loans purchased with credit deterioration		4,306		4,306
Provision for credit losses	(1,131)	3,828	(2,793)	2,360
Charge-offs	(112)	(511)	(499)	(511)
Recoveries	57	892	266	909
Net (charge-offs) recoveries	(55)	381	(233)	398
Allowance for credit losses on loans, ending balance	89,121	95,728	89,121	95,728
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	60,174	61,616	65,500	59,832
Initial allowance on loans purchased with credit deterioration		6,176		6,176
Provision for credit losses	3,126	5,097	(1,870)	7,164
Charge-offs	(1,636)	(3,176)	(2,577)	(4,536)
Recoveries	592	399	1,203	1,476
Net (charge-offs) recoveries	(1,044)	(2,777)	(1,374)	(3,060)
Allowance for credit losses on loans, ending balance	62,256	70,112	62,256	70,112
Consumer and Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	8,048	6,941	7,746	7,059
Initial allowance on loans purchased with credit deterioration		1		1
Provision for credit losses	1,481	1,350	3,084	2,631
Charge-offs	(1,945)	(1,488)	(3,502)	(3,146)
Recoveries	352	264	608	523
Net (charge-offs) recoveries	(1,593)	(1,224)	(2,894)	(2,623)
Allowance for credit losses on loans, ending balance	$ 7,936	$ 7,068	$ 7,936	$ 7,068