Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 17,094,078	$ 17,005,937
Consumer:
Loans and Leases Receivable Disclosure [Line Items]
Loans	276,878	308,994
Consumer: | Credit cards
Loans and Leases Receivable Disclosure [Line Items]
Loans	179,680	181,675
Consumer: | Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	97,198	127,319
Real Estate:
Loans and Leases Receivable Disclosure [Line Items]
Loans	13,477,000	13,391,531
Real Estate: | Construction and development
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,778,245	2,789,249
Real Estate: | Single family residential
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,647,451	2,689,946
Real Estate: | Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	8,051,304	7,912,336
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,637,150	2,695,329
Commercial | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,372,681	2,434,175
Commercial | Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	264,469	261,154
Other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 703,050	$ 610,083