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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	$ 383,840	$ 349,101	$ 333,742	$ 351,805
Allowance on PCD loans at acquisition	1,184		53,330
Allowance on PSLs at acquisition			39,261
Charge-offs	(5,316)	(4,222)	(47,796)	(8,165)
Recoveries	3,133	1,205	4,304	2,444
Net (charge-offs) recoveries	(2,183)	(3,017)	(43,492)	(5,721)
Allowance for credit losses on loans, ending balance	382,841	346,084	382,841	346,084
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	76,127	80,580	69,817	77,984
Allowance on PCD loans at acquisition			5,725
Allowance on PSLs at acquisition			5,342
Provision for credit losses	(1,949)	(2,765)	(6,706)	(325)
Charge-offs	(50)	(82)	(50)	(82)
Recoveries		85		241
Net (charge-offs) recoveries	(50)	3	(50)	159
Allowance for credit losses on loans, ending balance	74,128	77,818	74,128	77,818
Real Estate [Member] \| Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	23,213	26,097	23,438	27,693
Allowance on PCD loans at acquisition	236		691
Allowance on PSLs at acquisition			142
Provision for credit losses	798	737	(444)	(859)
Charge-offs	(75)	(37)	(137)	(37)
Recoveries	47	51	57	51
Net (charge-offs) recoveries	(28)	14	(80)	14
Allowance for credit losses on loans, ending balance	23,747	26,848	23,747	26,848
Real Estate [Member] \| 1-4 Family [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	75,134	83,895	76,596	80,735
Allowance on PCD loans at acquisition			1,353
Allowance on PSLs at acquisition			6,213
Provision for credit losses	1,901	(1,448)	(6,265)	2,763
Charge-offs	(385)	(410)	(1,284)	(1,468)
Recoveries	71	68	108	75
Net (charge-offs) recoveries	(314)	(342)	(1,176)	(1,393)
Allowance for credit losses on loans, ending balance	76,721	82,105	76,721	82,105
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	95,416	90,307	77,251	92,147
Allowance on PCD loans at acquisition			12,423
Allowance on PSLs at acquisition			11,696
Provision for credit losses	(2,356)	(1,131)	(8,431)	(2,793)
Charge-offs		(112)	(221)	(499)
Recoveries	1,064	57	1,406	266
Net (charge-offs) recoveries	1,064	(55)	1,185	233
Allowance for credit losses on loans, ending balance	94,124	89,121	94,124	89,121
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	104,735	60,174	77,939	65,500
Allowance on PCD loans at acquisition	1,420		32,229
Allowance on PSLs at acquisition			13,308
Provision for credit losses	(580)	3,126	21,324	(1,870)
Charge-offs	(2,781)	(1,636)	(42,457)	(2,577)
Recoveries	1,395	592	1,846	1,203
Net (charge-offs) recoveries	(1,386)	(1,044)	(40,611)	(1,374)
Allowance for credit losses on loans, ending balance	104,189	62,256	104,189	62,256
Consumer and Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	9,215	8,048	8,701	7,746
Allowance on PCD loans at acquisition			909
Allowance on PSLs at acquisition			2,560
Provision for credit losses	2,186	1,481	522	3,084
Charge-offs	(2,025)	(1,945)	(3,647)	(3,502)
Recoveries	556	352	887	608
Net (charge-offs) recoveries	(1,469)	(1,593)	(2,760)	(2,894)
Allowance for credit losses on loans, ending balance	$ 9,932	$ 7,936	$ 9,932	$ 7,936