LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	$ 320,023	$ 242,658	$ 307,100	$ 205,677
Provision for loan losses	25,348	43,643	50,871	93,019
Loans charged off	(16,845)	(20,670)	(35,302)	(35,626)
Recoveries of loans previously charged off	7,692	6,440	13,549	10,712
Ending balance, Allowance	336,218	272,071	336,218	272,071
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	63,804	45,238	64,053	39,455
Provision for loan losses	10,869	15,322	23,016	31,400
Loans charged off	(12,539)	(13,316)	(27,834)	(25,549)
Recoveries of loans previously charged off	4,408	3,545	7,307	5,588
Ending balance, Allowance	66,542	50,789	66,542	50,789
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	3,903	4,893	3,902	5,413
Provision for loan losses	263	1,513	1,163	1,836
Loans charged off	(926)	(2,052)	(2,017)	(3,192)
Recoveries of loans previously charged off	211	194	403	491
Ending balance, Allowance	3,451	4,548	3,451	4,548
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	36	137	50	174
Provision for loan losses	(149)	(199)	(283)	(418)
Loans charged off	(39)	(65)	(104)	(99)
Recoveries of loans previously charged off	180	225	365	441
Ending balance, Allowance	28	98	28	98
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	1,823	1,924	1,678	2,118
Provision for loan losses	319	411	464	217
Loans charged off	0	0	0	0
Recoveries of loans previously charged off	0	0	0	0
Ending balance, Allowance	2,142	2,335	2,142	2,335
Mortgage warehouse | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance				0
Municipal
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	63	354	345	357
Provision for loan losses	(3)	3	(285)	0
Loans charged off	0	0	0	0
Recoveries of loans previously charged off	0	0	0	0
Ending balance, Allowance	60	357	60	357
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	616	893	602	1,025
Provision for loan losses	594	51	163	(42)
Loans charged off	(2,802)	(1,848)	(4,808)	(3,269)
Recoveries of loans previously charged off	2,294	1,680	4,745	3,062
Ending balance, Allowance	702	776	702	776
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	72,168	42,841	61,017	32,659
Provision for loan losses	5,269	11,276	16,417	21,395
Loans charged off	0	0	0	0
Recoveries of loans previously charged off	45	472	48	572
Ending balance, Allowance	77,482	54,589	77,482	54,589
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	110,656	87,124	110,097	67,433
Provision for loan losses	11,311	12,275	11,785	32,644
Loans charged off	(513)	(3,320)	(513)	(3,320)
Recoveries of loans previously charged off	509	61	594	105
Ending balance, Allowance	121,963	96,140	121,963	96,140
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	66,954	59,254	65,356	57,043
Provision for loan losses	(3,125)	2,991	(1,569)	5,987
Loans charged off	(26)	(69)	(26)	(197)
Recoveries of loans previously charged off	45	263	87	453
Ending balance, Allowance	$ 63,848	$ 62,439	$ 63,848	62,439
Real estate – residential | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance				$ (847)