LOANS AND ALLOWANCE FOR CREDIT LOSSES - Analysis of Past-Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	$ 19,855,253	$ 15,874,258
Loans 90 Days or More Past Due and Still Accruing	17,865	12,648
Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	273,465	148,707
Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	95,203	54,024
Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	34,637	14,215
Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	143,625	80,468
Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	19,581,788	15,725,551
Commercial, financial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,679,403	1,875,993
Loans 90 Days or More Past Due and Still Accruing	3,267	1,165
Commercial, financial and agricultural | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	33,302	17,453
Commercial, financial and agricultural | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	16,219	3,431
Commercial, financial and agricultural | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	5,451	2,005
Commercial, financial and agricultural | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	11,632	12,017
Commercial, financial and agricultural | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,646,101	1,858,540
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	384,037	191,298
Loans 90 Days or More Past Due and Still Accruing	472	584
Consumer | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	6,443	3,548
Consumer | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,539	1,786
Consumer | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	3,163	871
Consumer | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	741	891
Consumer | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	377,594	187,750
Indirect automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	108,648	265,779
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	810	1,430
Indirect automobile | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	466	772
Indirect automobile | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	77	185
Indirect automobile | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	267	473
Indirect automobile | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	107,838	264,349
Mortgage warehouse
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	1,038,924	787,837
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	1,038,924	787,837
Municipal
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	509,151	572,701
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	509,151	572,701
Premium finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	1,023,479	798,409
Loans 90 Days or More Past Due and Still Accruing	13,626	9,134
Premium finance | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	38,105	20,466
Premium finance | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	13,859	6,992
Premium finance | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	10,620	4,340
Premium finance | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	13,626	9,134
Premium finance | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	985,374	777,943
Real estate – construction and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,086,438	1,452,339
Loans 90 Days or More Past Due and Still Accruing	500	1,758
Real estate – construction and development | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	30,162	20,189
Real estate – construction and development | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	25,367	16,601
Real estate – construction and development | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	3,829	1,398
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	966	2,190
Real estate – construction and development | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	2,056,276	1,432,150
Real estate – commercial and farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	7,604,867	6,834,917
Loans 90 Days or More Past Due and Still Accruing	0	7
Real estate – commercial and farmland | Total Loans Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	12,129	13,787
Real estate – commercial and farmland | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	1,738	6,713
Real estate – commercial and farmland | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	168	1,150
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	10,223	5,924
Real estate – commercial and farmland | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	7,592,738	6,821,130
Real estate – residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	4,420,306	3,094,985
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	152,514	71,834
Real estate – residential | Loans 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	35,015	17,729
Real estate – residential | Loans 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	11,329	4,266
Real estate – residential | Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	106,170	49,839
Real estate – residential | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income	$ 4,267,792	$ 3,023,151