LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 21,258,374	$ 20,739,906
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	3,299,269	2,953,135
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	202,688	221,735
Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,083,941	965,053
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	437,823	441,408
Premium finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,358,259	1,155,614
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,411,178	1,998,506
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	9,054,927	8,445,958
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 4,410,289	$ 4,558,497