Loans and Allowance for Credit Losses - Schedule of Categories of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 17,932,883	$ 17,492,179
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	268,997	291,232
Consumer | Credit cards
Loans and Leases Receivable Disclosure [Line Items]
Loans	172,610	175,760
Consumer | Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	96,387	115,472
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	13,952,669	13,771,225
Real Estate | Construction and development
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,621,859	2,873,807
Real Estate | Single family residential
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,566,162	2,607,450
Real Estate | Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	8,764,648	8,289,968
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,854,948	2,688,639
Commercial | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,521,440	2,382,339
Commercial | Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	333,508	306,300
Other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 856,269	$ 741,083