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Loans and Allowance for Credit Losses - Types of Loans in Loan Portfolio (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		$ 11,297	$ 10,690
Loans held for investment		20,738,294	21,057,616
Total loans, including Warehouse Purchase Program		22,027,769	22,149,209
Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		11,297	10,690
Warehouse Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		1,278,178	1,080,903
Total loans, including Warehouse Purchase Program		1,278,178	1,080,903
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		2,391,119	2,508,088
Total loans, including Warehouse Purchase Program		2,391,119	2,508,088
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		2,865,280	2,859,281
Total loans, including Warehouse Purchase Program		2,865,280	2,859,281
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		8,299,342	8,476,899
Total loans, including Warehouse Purchase Program	[1]	8,310,639	8,487,589
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		5,796,937	5,800,985
Total loans, including Warehouse Purchase Program		5,796,937	5,800,985
Real Estate [Member] | Farmland [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		664,039	681,883
Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		355,550	351,663
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		366,027	378,817
Total loans, including Warehouse Purchase Program		$ 366,027	$ 378,817
[1] Includes $11.3 million and $10.7 million of residential mortgage loans held for sale at September 30, 2025, and December 31, 2024, respectively.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
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Amount, before valuation allowance, of financing receivable classified as held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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-Paragraph 1
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