LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 21,041,497	$ 20,739,906
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	3,184,211	2,953,135
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	209,990	221,735
Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,092,475	965,053
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	436,759	441,408
Premium finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,294,293	1,155,614
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,485,842	1,998,506
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	8,877,750	8,445,958
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 4,460,177	$ 4,558,497