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Loans and Allowance for Credit Losses - Types of Loans in Loan Portfolio (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		$ 6,380	$ 5,734
Loans held for investment		20,393,943	20,352,559
Total loans, including Warehouse Purchase Program		21,265,247	21,180,538
Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		6,380	5,734
Warehouse Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		864,924	822,245
Total loans, including Warehouse Purchase Program		864,924	822,245
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		2,470,848	2,305,040
Total loans, including Warehouse Purchase Program		2,470,848	2,305,040
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		2,876,588	3,076,591
Total loans, including Warehouse Purchase Program		2,876,588	3,076,591
Real Estate [Member] | 1-4 Family [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		8,275,040	8,162,344
Total loans, including Warehouse Purchase Program	[1]	8,281,420	8,168,078
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		5,631,460	5,662,948
Total loans, including Warehouse Purchase Program		5,631,460	5,662,948
Real Estate [Member] | Farmland [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		590,896	598,898
Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		222,196	217,145
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		326,915	329,593
Total loans, including Warehouse Purchase Program		$ 326,915	$ 329,593
[1] Includes $6.4 million and $5.7 million of residential mortgage loans held for sale at March 31, 2024 and December 31, 2023, 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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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 310
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Amount, before valuation allowance, of financing receivable classified as held-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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