Loans and Allowance for Credit Losses - Schedule of Categories of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 17,188,817	$ 17,005,937
Consumer:
Loans and Leases Receivable Disclosure [Line Items]
Loans	285,355	308,994
Consumer: | Credit cards
Loans and Leases Receivable Disclosure [Line Items]
Loans	173,020	181,675
Consumer: | Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	112,335	127,319
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	13,368,321	13,391,531
Real Estate | Construction and development
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,874,823	2,789,249
Real Estate | Single family residential
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,617,849	2,689,946
Real Estate | Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,875,649	7,912,336
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,750,569	2,695,329
Commercial | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,397,388	2,434,175
Commercial | Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	353,181	261,154
Other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 784,572	$ 610,083