LOANS AND ALLOWANCE FOR CREDIT LOSSES - Analysis of Past-Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Total Loans	$ 22,177,865	$ 21,513,522
Loans 90 Days or More Past Due and Still Accruing	8,364	8,492
Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	229,822	208,776
Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	79,079	72,263
Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	45,253	33,143
Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	105,490	103,370
Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	21,948,043	21,304,746
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans	3,453,501	3,288,505
Loans 90 Days or More Past Due and Still Accruing	19	0
Commercial and industrial \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	24,383	23,298
Commercial and industrial \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	9,582	8,890
Commercial and industrial \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	5,662	5,938
Commercial and industrial \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	9,139	8,470
Commercial and industrial \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	3,429,118	3,265,207
Consumer
Financing Receivable, Past Due [Line Items]
Total Loans	157,252	180,010
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	7,947	6,052
Consumer \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,856	3,655
Consumer \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	5,955	2,199
Consumer \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	136	198
Consumer \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	149,305	173,958
Mortgage warehouse
Financing Receivable, Past Due [Line Items]
Total Loans	1,345,808	1,150,782
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	1,345,808	1,150,782
Municipal
Financing Receivable, Past Due [Line Items]
Total Loans	415,396	434,234
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	415,396	434,234
Premium finance
Financing Receivable, Past Due [Line Items]
Total Loans	1,534,445	1,306,267
Loans 90 Days or More Past Due and Still Accruing	8,345	8,492
Premium finance \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	27,204	28,916
Premium finance \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	10,024	13,463
Premium finance \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	8,835	6,961
Premium finance \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	8,345	8,492
Premium finance \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	1,507,241	1,277,351
Real estate – construction and development
Financing Receivable, Past Due [Line Items]
Total Loans	1,702,983	1,469,250
Loans 90 Days or More Past Due and Still Accruing	0	0
Real estate – construction and development \| Total Loans Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	4,149	3,525
Real estate – construction and development \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	2,131	2,238
Real estate – construction and development \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,380	349
Real estate – construction and development \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	638	938
Real estate – construction and development \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	1,698,834	1,465,725
Real estate – commercial and farmland
Financing Receivable, Past Due [Line Items]
Total Loans	9,243,359	9,311,405
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	5,193	7,493
Real estate – commercial and farmland \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,321	1,707
Real estate – commercial and farmland \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	63	16
Real estate – commercial and farmland \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	3,809	5,770
Real estate – commercial and farmland \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	9,238,166	9,303,912
Real estate – residential
Financing Receivable, Past Due [Line Items]
Total Loans	4,325,121	4,373,069
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	160,946	139,492
Real estate – residential \| Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	54,165	42,310
Real estate – residential \| Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	23,358	17,680
Real estate – residential \| Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	83,423	79,502
Real estate – residential \| Current Loans
Financing Receivable, Past Due [Line Items]
Total Loans	$ 4,164,175	$ 4,233,577