LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance	$ 336,218	$ 272,071	$ 307,100	$ 205,677
Provision for loan losses	6,313	30,095	57,184	123,114
Loans charged off	(15,352)	(19,488)	(50,654)	(55,114)
Recoveries of loans previously charged off	7,278	7,426	20,827	18,138
Ending balance, Allowance	334,457	290,104	334,457	290,104
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	66,542	50,789	64,053	39,455
Provision for loan losses	8,463	14,650	31,479	46,050
Loans charged off	(12,316)	(16,519)	(40,150)	(42,068)
Recoveries of loans previously charged off	4,979	4,745	12,286	10,333
Ending balance, Allowance	67,668	53,665	67,668	53,665
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	3,451	4,548	3,902	5,413
Provision for loan losses	1,287	310	2,450	2,146
Loans charged off	(819)	(948)	(2,836)	(4,140)
Recoveries of loans previously charged off	208	203	611	694
Ending balance, Allowance	4,127	4,113	4,127	4,113
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	28	98	50	174
Provision for loan losses	(65)	(149)	(348)	(567)
Loans charged off	(34)	(36)	(138)	(135)
Recoveries of loans previously charged off	101	158	466	599
Ending balance, Allowance	30	71	30	71
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	2,142	2,335	1,678	2,118
Provision for loan losses	30	(589)	494	(372)
Loans charged off	0	0	0	0
Recoveries of loans previously charged off	0	0	0	0
Ending balance, Allowance	2,172	1,746	2,172	1,746
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	60	357	345	357
Provision for loan losses	137	(9)	(148)	(9)
Loans charged off	0	0	0	0
Recoveries of loans previously charged off	0	0	0	0
Ending balance, Allowance	197	348	197	348
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	702	776	602	1,025
Provision for loan losses	180	183	343	141
Loans charged off	(2,102)	(1,951)	(6,910)	(5,220)
Recoveries of loans previously charged off	1,860	1,639	6,605	4,701
Ending balance, Allowance	640	647	640	647
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	77,482	54,589	61,017	32,659
Provision for loan losses	(2,506)	8,525	13,911	29,920
Loans charged off	0	0	0	0
Recoveries of loans previously charged off	6	74	54	646
Ending balance, Allowance	74,982	63,188	74,982	63,188
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	121,963	96,140	110,097	67,433
Provision for loan losses	(1,885)	5,453	9,900	38,097
Loans charged off	(58)	0	(571)	(3,320)
Recoveries of loans previously charged off	61	371	655	476
Ending balance, Allowance	120,081	101,964	120,081	101,964
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	63,848	62,439	65,356	57,043
Provision for loan losses	672	1,721	(897)	7,708
Loans charged off	(23)	(34)	(49)	(231)
Recoveries of loans previously charged off	63	236	150	689
Ending balance, Allowance	$ 64,560	$ 64,362	$ 64,560	64,362
Real estate – residential | Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, Allowance				$ (847)