LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 22,177,865	$ 21,513,522
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	3,453,501	3,288,505
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	157,252	180,010
Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,345,808	1,150,782
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	415,396	434,234
Premium finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,534,445	1,306,267
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,702,983	1,469,250
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	9,243,359	9,311,405
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 4,325,121	$ 4,373,069