LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 20,706,644	$ 20,739,906
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	3,075,971	2,953,135
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	213,902	221,735
Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	891,412	965,053
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	429,227	441,408
Premium finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,176,309	1,155,614
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,842,431	1,998,506
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	8,574,626	8,445,958
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 4,502,766	$ 4,558,497