Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 17,001,760	$ 16,845,670
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	307,273	318,666
Consumer | Credit cards
Loans and Leases Receivable Disclosure [Line Items]
Loans	182,742	191,204
Consumer | Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	124,531	127,462
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	13,464,526	13,338,186
Real Estate | Construction and development
Loans and Leases Receivable Disclosure [Line Items]
Loans	3,331,739	3,144,220
Real Estate | Single family residential
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,624,738	2,641,556
Real Estate | Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,508,049	7,552,410
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,725,953	2,722,886
Commercial | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,499,311	2,490,176
Commercial | Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	226,642	232,710
Other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 504,008	$ 465,932