LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	$ 307,100	$ 205,677
Provision for loan losses	25,523	49,376
Loans charged off	(18,457)	(14,956)
Recoveries of loans previously charged off	5,857	4,272
Ending balance, Allowance	320,023	242,658
Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance		(1,711)
Commercial, financial and agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	64,053	39,455
Provision for loan losses	12,147	16,078
Loans charged off	(15,295)	(12,233)
Recoveries of loans previously charged off	2,899	2,043
Ending balance, Allowance	63,804	45,238
Commercial, financial and agricultural | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance		(105)
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	3,902	5,413
Provision for loan losses	900	323
Loans charged off	(1,091)	(1,140)
Recoveries of loans previously charged off	192	297
Ending balance, Allowance	3,903	4,893
Consumer | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance		0
Indirect automobile
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	50	174
Provision for loan losses	(134)	(219)
Loans charged off	(65)	(34)
Recoveries of loans previously charged off	185	216
Ending balance, Allowance	36	137
Indirect automobile | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance		0
Mortgage warehouse
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	1,678	2,118
Provision for loan losses	145	(194)
Loans charged off	0	0
Recoveries of loans previously charged off	0	0
Ending balance, Allowance	1,823	1,924
Municipal
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	345	357
Provision for loan losses	(282)	(3)
Loans charged off	0	0
Recoveries of loans previously charged off	0	0
Ending balance, Allowance	63	354
Municipal | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance		0
Premium finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	602	1,025
Provision for loan losses	(431)	(93)
Loans charged off	(2,006)	(1,421)
Recoveries of loans previously charged off	2,451	1,382
Ending balance, Allowance	616	893
Premium finance | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance		0
Real estate – construction and development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	61,017	32,659
Provision for loan losses	11,148	10,119
Loans charged off	0	0
Recoveries of loans previously charged off	3	100
Ending balance, Allowance	72,168	42,841
Real estate – construction and development | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance		(37)
Real estate – commercial and farmland
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	110,097	67,433
Provision for loan losses	474	20,369
Loans charged off	0	0
Recoveries of loans previously charged off	85	44
Ending balance, Allowance	110,656	87,124
Real estate – commercial and farmland | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance		(722)
Real estate – residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	65,356	57,043
Provision for loan losses	1,556	2,996
Loans charged off	0	(128)
Recoveries of loans previously charged off	42	190
Ending balance, Allowance	$ 66,954	59,254
Real estate – residential | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance		(847)
Mortgage Ware house Portfolio Segment | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance		$ 0