LOANS - Deferrals Loans (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
COVID-19 Deferrals	$ 2,757,701
Deferrals as a % of total loans	19.00%
Commercial, financial and agricultural
Financing Receivable, Troubled Debt Restructuring [Line Items]
COVID-19 Deferrals	$ 155,310
Deferrals as a % of total loans	8.40%
Consumer installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
COVID-19 Deferrals	$ 15,502
Deferrals as a % of total loans	2.70%
Indirect automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
COVID-19 Deferrals	$ 65,064
Deferrals as a % of total loans	8.80%
Municipal
Financing Receivable, Troubled Debt Restructuring [Line Items]
COVID-19 Deferrals	$ 2,461
Deferrals as a % of total loans	0.30%
Premium finance
Financing Receivable, Troubled Debt Restructuring [Line Items]
COVID-19 Deferrals	$ 46,496
Deferrals as a % of total loans	6.70%
Real estate – construction and development
Financing Receivable, Troubled Debt Restructuring [Line Items]
COVID-19 Deferrals	$ 192,474
Deferrals as a % of total loans	11.70%
Real estate – commercial and farmland
Financing Receivable, Troubled Debt Restructuring [Line Items]
COVID-19 Deferrals	$ 1,961,513
Deferrals as a % of total loans	40.80%
Real estate – residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
COVID-19 Deferrals	$ 318,881
Deferrals as a % of total loans	11.70%