Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 16,771,888	$ 16,142,124
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	304,382	349,810
Consumer | Credit cards
Loans and Leases Receivable Disclosure [Line Items]
Loans	191,550	196,928
Consumer | Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	112,832	152,882
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	13,245,208	12,581,262
Real Estate | Construction and development
Loans and Leases Receivable Disclosure [Line Items]
Loans	3,022,321	2,566,649
Real Estate | Single family residential
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,657,879	2,546,115
Real Estate | Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,565,008	7,468,498
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,773,989	2,837,913
Commercial | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,477,077	2,632,290
Commercial | Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	296,912	205,623
Other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 448,309	$ 373,139