LOANS HELD FOR INVESTMENT - Additional Information I (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred origination costs	$ 1,800	$ 6,100
Unearned income	130,400	132,600
Finance lease, unearned income	126,000	128,000
Loans held for investment	12,746,556	12,185,483
Asset Pledged as Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,400,000	4,600,000
Asset Pledged as Collateral [Member] | Time Deposits [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	123,000	121,100
Asset Pledged as Collateral [Member] | Uninsured Portion Of Government Deposits [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	163,500	166,900
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,700,000	1,800,000
Asset Pledged as Collateral [Member] | Federal Reserve Bank Advances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,400,000	2,500,000
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,828,431	2,821,726
Servicing of loans	3,700,000	3,800,000
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Servicing of loans	$ 262,900	$ 230,500