Loans and Allowance for Credit Losses - Schedule of Categories of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 18,062,369	$ 17,492,179
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	273,265	291,232
Consumer \| Credit cards
Loans and Leases Receivable Disclosure [Line Items]
Loans	174,148	175,760
Consumer \| Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	99,117	115,472
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	13,970,683	13,771,225
Real Estate \| Construction and development
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,577,630	2,873,807
Real Estate \| Single family residential
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,564,282	2,607,450
Real Estate \| Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	8,828,771	8,289,968
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,943,129	2,688,639
Commercial \| Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,516,607	2,382,339
Commercial \| Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	426,522	306,300
Other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 875,292	$ 741,083