Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 17,192,437	$ 16,845,670
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	308,632	318,666
Consumer | Credit cards
Loans and Leases Receivable Disclosure [Line Items]
Loans	178,354	191,204
Consumer | Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	130,278	127,462
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	13,483,170	13,338,186
Real Estate | Construction and development
Loans and Leases Receivable Disclosure [Line Items]
Loans	3,056,703	3,144,220
Real Estate | Single family residential
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,666,201	2,641,556
Real Estate | Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,760,266	7,552,410
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,769,655	2,722,886
Commercial | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,484,474	2,490,176
Commercial | Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	285,181	232,710
Other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 630,980	$ 465,932