LOANS AND ALLOWANCE FOR CREDIT LOSSES - Analysis of Past-Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Total Loans	$ 21,258,374	$ 20,739,906
Loans 90 Days or More Past Due and Still Accruing	9,325	17,733
Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	205,571	244,978
Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	67,636	106,949
Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	40,618	31,540
Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	97,317	106,489
Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	21,052,803	20,494,928
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans	3,299,269	2,953,135
Loans 90 Days or More Past Due and Still Accruing	0	5,159
Commercial and industrial \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	22,664	31,057
Commercial and industrial \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	7,687	12,300
Commercial and industrial \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	5,410	5,908
Commercial and industrial \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	9,567	12,849
Commercial and industrial \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	3,276,605	2,922,078
Consumer
Financing Receivable, Past Due [Line Items]
Total Loans	202,688	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	1,332	3,548
Consumer \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	619	2,672
Consumer \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	546	557
Consumer \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	167	319
Consumer \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	201,356	218,187
Mortgage warehouse
Financing Receivable, Past Due [Line Items]
Total Loans	1,083,941	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	1,083,941	965,053
Municipal
Financing Receivable, Past Due [Line Items]
Total Loans	437,823	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	437,823	441,408
Premium finance
Financing Receivable, Past Due [Line Items]
Total Loans	1,358,259	1,155,614
Loans 90 Days or More Past Due and Still Accruing	9,325	12,485
Premium finance \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	32,088	33,868
Premium finance \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	15,247	15,068
Premium finance \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	7,516	6,315
Premium finance \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	9,325	12,485
Premium finance \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	1,326,171	1,121,746
Real estate – construction and development
Financing Receivable, Past Due [Line Items]
Total Loans	1,411,178	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	1,222	27,349
Real estate – construction and development \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	275	23,102
Real estate – construction and development \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	41	461
Real estate – construction and development \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	906	3,786
Real estate – construction and development \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	1,409,956	1,971,157
Real estate – commercial and farmland
Financing Receivable, Past Due [Line Items]
Total Loans	9,054,927	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	14,193	15,202
Real estate – commercial and farmland \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	4,307	6,787
Real estate – commercial and farmland \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	4,462	2,435
Real estate – commercial and farmland \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	5,424	5,980
Real estate – commercial and farmland \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	9,040,734	8,430,756
Real estate – residential
Financing Receivable, Past Due [Line Items]
Total Loans	4,410,289	4,558,497
Loans 90 Days or More Past Due and Still Accruing	0	0
Real estate – residential \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	134,072	133,954
Real estate – residential \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	39,501	47,020
Real estate – residential \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	22,643	15,864
Real estate – residential \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	71,928	71,070
Real estate – residential \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	$ 4,276,217	$ 4,424,543