Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 16,833,653	$ 16,142,124
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	357,785	349,810
Consumer | Credit cards
Loans and Leases Receivable Disclosure [Line Items]
Loans	209,452	196,928
Consumer | Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	148,333	152,882
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	13,110,081	12,581,262
Real Estate | Construction and development
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,930,586	2,566,649
Real Estate | Single family residential
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,633,365	2,546,115
Real Estate | Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,546,130	7,468,498
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,849,871	2,837,913
Commercial | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,569,330	2,632,290
Commercial | Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	280,541	205,623
Other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 515,916	$ 373,139