LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Categories of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 17,492,179	$ 17,005,937
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	291,232	308,994
Consumer: | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	175,760	181,675
Consumer: | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	115,472	127,319
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	13,771,225	13,391,531
Real Estate | Construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,873,807	2,789,249
Real Estate | Single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,607,450	2,689,946
Real Estate | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,289,968	7,912,336
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,688,639	2,695,329
Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,382,339	2,434,175
Commercial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	306,300	261,154
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 741,083	$ 610,083