LOANS AND ALLOWANCE FOR CREDIT LOSSES - Analysis of Past-Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Total Loans	$ 21,041,497	$ 20,739,906
Loans 90 Days or More Past Due and Still Accruing	8,415	17,733
Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	200,031	244,978
Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	76,103	106,949
Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	38,602	31,540
Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	85,326	106,489
Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	20,841,466	20,494,928
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans	3,184,211	2,953,135
Loans 90 Days or More Past Due and Still Accruing	2	5,159
Commercial and industrial \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	26,442	31,057
Commercial and industrial \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	7,134	12,300
Commercial and industrial \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	6,912	5,908
Commercial and industrial \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	12,396	12,849
Commercial and industrial \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	3,157,769	2,922,078
Consumer
Financing Receivable, Past Due [Line Items]
Total Loans	209,990	221,735
Loans 90 Days or More Past Due and Still Accruing	0	0
Consumer \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,819	3,548
Consumer \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,009	2,672
Consumer \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	332	557
Consumer \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	478	319
Consumer \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	208,171	218,187
Mortgage warehouse
Financing Receivable, Past Due [Line Items]
Total Loans	1,092,475	965,053
Loans 90 Days or More Past Due and Still Accruing	0	0
Mortgage warehouse \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Mortgage warehouse \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Mortgage warehouse \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Mortgage warehouse \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Mortgage warehouse \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	1,092,475	965,053
Municipal
Financing Receivable, Past Due [Line Items]
Total Loans	436,759	441,408
Loans 90 Days or More Past Due and Still Accruing	0	0
Municipal \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Municipal \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Municipal \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Municipal \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Municipal \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	436,759	441,408
Premium finance
Financing Receivable, Past Due [Line Items]
Total Loans	1,294,293	1,155,614
Loans 90 Days or More Past Due and Still Accruing	8,340	12,485
Premium finance \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	26,288	33,868
Premium finance \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	11,511	15,068
Premium finance \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	6,437	6,315
Premium finance \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	8,340	12,485
Premium finance \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	1,268,005	1,121,746
Real estate – construction and development
Financing Receivable, Past Due [Line Items]
Total Loans	1,485,842	1,998,506
Loans 90 Days or More Past Due and Still Accruing	0	89
Real estate – construction and development \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	7,008	27,349
Real estate – construction and development \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	5,447	23,102
Real estate – construction and development \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	53	461
Real estate – construction and development \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,508	3,786
Real estate – construction and development \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	1,478,834	1,971,157
Real estate – commercial and farmland
Financing Receivable, Past Due [Line Items]
Total Loans	8,877,750	8,445,958
Loans 90 Days or More Past Due and Still Accruing	0	0
Real estate – commercial and farmland \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	11,626	15,202
Real estate – commercial and farmland \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,251	6,787
Real estate – commercial and farmland \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	3,955	2,435
Real estate – commercial and farmland \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	6,420	5,980
Real estate – commercial and farmland \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	8,866,124	8,430,756
Real estate – residential
Financing Receivable, Past Due [Line Items]
Total Loans	4,460,177	4,558,497
Loans 90 Days or More Past Due and Still Accruing	73	0
Real estate – residential \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	126,848	133,954
Real estate – residential \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	49,751	47,020
Real estate – residential \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	20,913	15,864
Real estate – residential \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	56,184	71,070
Real estate – residential \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	$ 4,333,329	$ 4,424,543