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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	$ 330,219	$ 282,191	$ 332,362	$ 281,576
Initial allowance on loans purchased with credit deterioration	26,078	67,099	26,078	67,099
Provision for credit losses	7,923	11,984	7,923	11,984
Charge-offs	(6,117)	(16,833)	(9,718)	(19,024)
Recoveries	1,749	768	3,207	3,574
Net (charge-offs) recoveries	(4,368)	(16,065)	(6,511)	(15,450)
Allowance for credit losses on loans, ending balance	359,852	345,209	359,852	345,209
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	82,158	80,561	87,775	78,853
Initial allowance on loans purchased with credit deterioration	942	15,237	942	15,237
Provision for credit losses	(6,215)	(3,890)	(11,834)	(2,195)
Charge-offs	(109)	(77)	(109)	(77)
Recoveries		27	2	40
Net (charge-offs) recoveries	(109)	(50)	(107)	(37)
Allowance for credit losses on loans, ending balance	76,776	91,858	76,776	91,858
Real Estate [Member] \| Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	12,627	8,061	11,380	7,699
Initial allowance on loans purchased with credit deterioration	14,309	2,914	14,309	2,914
Provision for credit losses	2,757	201	4,027	557
Charge-offs	(400)	(113)	(522)	(113)
Recoveries	186	191	285	197
Net (charge-offs) recoveries	(214)	78	(237)	84
Allowance for credit losses on loans, ending balance	29,479	11,254	29,479	11,254
Real Estate [Member] \| 1-4 Family [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	79,664	62,538	77,652	60,795
Initial allowance on loans purchased with credit deterioration	344	1,590	344	1,590
Provision for credit losses	1,106	3,524	3,575	5,127
Charge-offs	(433)	(36)	(894)	(101)
Recoveries	8	106	12	311
Net (charge-offs) recoveries	(425)	70	(882)	210
Allowance for credit losses on loans, ending balance	80,689	67,722	80,689	67,722
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	87,213	67,972	88,664	66,272
Initial allowance on loans purchased with credit deterioration	4,306	21,002	4,306	21,002
Provision for credit losses	3,828	12,748	2,360	14,447
Charge-offs	(511)	(14,975)	(511)	(14,975)
Recoveries	892	18	909	19
Net (charge-offs) recoveries	381	(14,957)	398	(14,956)
Allowance for credit losses on loans, ending balance	95,728	86,765	95,728	86,765
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	61,616	57,296	59,832	62,319
Initial allowance on loans purchased with credit deterioration	6,176	26,332	6,176	26,332
Provision for credit losses	5,097	(1,498)	7,164	(7,993)
Charge-offs	(3,176)	(341)	(4,536)	(1,242)
Recoveries	399	181	1,476	2,554
Net (charge-offs) recoveries	(2,777)	(160)	(3,060)	1,312
Allowance for credit losses on loans, ending balance	70,112	81,970	70,112	81,970
Consumer and Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	6,941	5,763	7,059	5,638
Initial allowance on loans purchased with credit deterioration	1	24	1	24
Provision for credit losses	1,350	899	2,631	2,041
Charge-offs	(1,488)	(1,291)	(3,146)	(2,516)
Recoveries	264	245	523	453
Net (charge-offs) recoveries	(1,224)	(1,046)	(2,623)	(2,063)
Allowance for credit losses on loans, ending balance	$ 7,068	$ 5,640	$ 7,068	$ 5,640