LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Analysis of Past-Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	$ 20,269,303	$ 19,855,253
Loans 90 Days or More Past Due and Still Accruing	16,988	17,865
Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	272,839	273,465
Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	82,850	95,203
Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	34,281	34,637
Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	155,708	143,625
Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	19,996,464	19,581,788
Commercial, financial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,688,929	2,679,403
Loans 90 Days or More Past Due and Still Accruing	5,310	3,267
Commercial, financial and agricultural | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	26,195	33,302
Commercial, financial and agricultural | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	11,023	16,219
Commercial, financial and agricultural | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	5,439	5,451
Commercial, financial and agricultural | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	9,733	11,632
Commercial, financial and agricultural | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,662,734	2,646,101
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	241,552	384,037
Loans 90 Days or More Past Due and Still Accruing	0	472
Consumer | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	3,690	6,443
Consumer | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,155	2,539
Consumer | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	1,037	3,163
Consumer | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	498	741
Consumer | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	237,862	377,594
Indirect automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	34,257	108,648
Loans 90 Days or More Past Due and Still Accruing	0	0
Indirect automobile | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	248	810
Indirect automobile | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	153	466
Indirect automobile | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	17	77
Indirect automobile | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	78	267
Indirect automobile | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	34,009	107,838
Mortgage warehouse
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	818,728	1,038,924
Loans 90 Days or More Past Due and Still Accruing	0	0
Mortgage warehouse | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	0	0
Mortgage warehouse | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	0	0
Mortgage warehouse | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	0	0
Mortgage warehouse | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	0	0
Mortgage warehouse | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	818,728	1,038,924
Municipal
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	492,668	509,151
Loans 90 Days or More Past Due and Still Accruing	0	0
Municipal | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	0	0
Municipal | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	0	0
Municipal | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	0	0
Municipal | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	0	0
Municipal | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	492,668	509,151
Premium finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	946,562	1,023,479
Loans 90 Days or More Past Due and Still Accruing	11,678	13,626
Premium finance | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	30,889	38,105
Premium finance | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	12,379	13,859
Premium finance | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	6,832	10,620
Premium finance | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	11,678	13,626
Premium finance | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	915,673	985,374
Real estate – construction and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,129,187	2,086,438
Loans 90 Days or More Past Due and Still Accruing	0	500
Real estate – construction and development | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,376	30,162
Real estate – construction and development | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,094	25,367
Real estate – construction and development | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	0	3,829
Real estate – construction and development | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	282	966
Real estate – construction and development | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,126,811	2,056,276
Real estate – commercial and farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	8,059,754	7,604,867
Loans 90 Days or More Past Due and Still Accruing	0	0
Real estate – commercial and farmland | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	13,078	12,129
Real estate – commercial and farmland | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	5,070	1,738
Real estate – commercial and farmland | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	1,656	168
Real estate – commercial and farmland | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	6,352	10,223
Real estate – commercial and farmland | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	8,046,676	7,592,738
Real estate – residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	4,857,666	4,420,306
Loans 90 Days or More Past Due and Still Accruing	0	0
Real estate – residential | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	196,363	152,514
Real estate – residential | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	49,976	35,015
Real estate – residential | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	19,300	11,329
Real estate – residential | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	127,087	106,170
Real estate – residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	$ 4,661,303	$ 4,267,792