LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans by Risk Grade (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	$ 2,068,928	$ 3,520,850
Year two	2,429,414	5,111,112
Year three	5,234,085	4,336,679
Year four	4,078,648	1,988,570
Year five	1,899,081	1,209,250
Prior	3,185,410	2,289,160
Revolving Loans Amortized Cost Basis	2,097,037	1,813,682
Loans, net of unearned income	20,992,603	20,269,303
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	2,063,454	3,502,909
Year two	2,399,431	5,062,109
Year three	5,176,298	4,228,744
Year four	4,014,540	1,953,577
Year five	1,851,674	1,149,459
Prior	3,036,860	2,188,927
Revolving Loans Amortized Cost Basis	2,081,159	1,761,006
Loans, net of unearned income	20,623,416	19,846,731
Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,454	13
Year two	2,627	17,471
Year three	4,305	59,123
Year four	5,094	293
Year five	16,189	30,543
Prior	81,535	48,737
Revolving Loans Amortized Cost Basis	4,273	47,545
Loans, net of unearned income	115,477	203,725
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	4,020	17,928
Year two	27,356	31,532
Year three	53,482	48,812
Year four	59,014	34,700
Year five	31,218	29,248
Prior	67,015	51,496
Revolving Loans Amortized Cost Basis	11,605	5,131
Loans, net of unearned income	253,710	218,847
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	534,923	894,463
Year two	730,944	762,401
Year three	636,509	393,774
Year four	318,625	96,287
Year five	95,479	60,089
Prior	74,315	47,294
Revolving Loans Amortized Cost Basis	470,178	434,621
Loans, net of unearned income	2,860,973	2,688,929
Current-period gross charge offs, year one	0
Current-period gross charge offs, year two	11,545
Current-period gross charge offs, year three	10,486
Current-period gross charge offs, year four	4,196
Current-period gross charge offs, year five	1,007
Current-period gross charge offs, prior	600
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	27,834
Commercial, financial and agricultural | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	534,839	892,951
Year two	729,004	758,471
Year three	631,819	384,830
Year four	307,287	95,055
Year five	93,751	56,447
Prior	65,315	41,095
Revolving Loans Amortized Cost Basis	459,680	432,472
Loans, net of unearned income	2,821,695	2,661,321
Commercial, financial and agricultural | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	30	335
Year three	1,298	5,722
Year four	1,456	92
Year five	1,182	109
Prior	3,409	451
Revolving Loans Amortized Cost Basis	2,640	803
Loans, net of unearned income	10,015	7,512
Commercial, financial and agricultural | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	84	1,512
Year two	1,910	3,595
Year three	3,392	3,222
Year four	9,882	1,140
Year five	546	3,533
Prior	5,591	5,748
Revolving Loans Amortized Cost Basis	7,858	1,346
Loans, net of unearned income	29,263	20,096
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	31,527	44,890
Year two	25,318	17,847
Year three	12,765	5,919
Year four	3,890	25,988
Year five	21,312	16,035
Prior	31,658	21,494
Revolving Loans Amortized Cost Basis	91,317	109,379
Loans, net of unearned income	217,787	241,552
Current-period gross charge offs, year one	35
Current-period gross charge offs, year two	387
Current-period gross charge offs, year three	141
Current-period gross charge offs, year four	18
Current-period gross charge offs, year five	547
Current-period gross charge offs, prior	691
Current-period gross charge offs, revolving loans amortized cost basis	198
Current-period gross charge offs	2,017
Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	31,494	44,736
Year two	25,079	17,661
Year three	12,646	5,878
Year four	3,856	25,654
Year five	21,129	15,838
Prior	31,061	20,937
Revolving Loans Amortized Cost Basis	91,257	109,214
Loans, net of unearned income	216,522	239,918
Consumer | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	5
Year three	20	0
Year four	0	0
Year five	6	0
Prior	53	26
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	79	31
Consumer | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	33	154
Year two	239	181
Year three	99	41
Year four	34	334
Year five	177	197
Prior	544	531
Revolving Loans Amortized Cost Basis	60	165
Loans, net of unearned income	1,186	1,603
Indirect automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	6,141
Prior	16,335	28,116
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	16,335	34,257
Current-period gross charge offs, year one	0
Current-period gross charge offs, year two	0
Current-period gross charge offs, year three	0
Current-period gross charge offs, year four	0
Current-period gross charge offs, year five	0
Current-period gross charge offs, prior	104
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	104
Indirect automobile | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	6,086
Prior	16,002	27,646
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	16,002	33,732
Indirect automobile | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0
Year two	0
Year three	0
Year four	0
Year five	0
Prior	29
Revolving Loans Amortized Cost Basis	0
Loans, net of unearned income	29
Indirect automobile | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	55
Prior	304	470
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	304	525
Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	1,070,921	818,728
Loans, net of unearned income	1,070,921	818,728
Current-period gross charge offs, year one	0
Current-period gross charge offs, year two	0
Current-period gross charge offs, year three	0
Current-period gross charge offs, year four	0
Current-period gross charge offs, year five	0
Current-period gross charge offs, prior	0
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	0
Mortgage warehouse | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	1,070,471	772,366
Loans, net of unearned income	1,070,471	772,366
Mortgage warehouse | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	450	46,362
Loans, net of unearned income	450	46,362
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	20,042	14,216
Year two	9,167	27,346
Year three	31,822	48,941
Year four	37,541	177,156
Year five	146,128	14,655
Prior	207,646	208,236
Revolving Loans Amortized Cost Basis	2,621	2,118
Loans, net of unearned income	454,967	492,668
Current-period gross charge offs, year one	0
Current-period gross charge offs, year two	0
Current-period gross charge offs, year three	0
Current-period gross charge offs, year four	0
Current-period gross charge offs, year five	0
Current-period gross charge offs, prior	0
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	0
Municipal | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	20,042	14,216
Year two	9,167	27,346
Year three	31,822	48,941
Year four	37,541	177,156
Year five	146,128	14,655
Prior	207,646	208,236
Revolving Loans Amortized Cost Basis	2,621	2,118
Loans, net of unearned income	454,967	492,668
Premium finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	984,154	939,707
Year two	165,995	4,939
Year three	661	1,916
Year four	451	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	1,151,261	946,562
Current-period gross charge offs, year one	380
Current-period gross charge offs, year two	4,183
Current-period gross charge offs, year three	245
Current-period gross charge offs, year four	0
Current-period gross charge offs, year five	0
Current-period gross charge offs, prior	0
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	4,808
Premium finance | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	980,449	928,930
Year two	158,296	4,038
Year three	649	1,916
Year four	451	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	1,139,845	934,884
Premium finance | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	3,705	10,777
Year two	7,699	901
Year three	12	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	11,416	11,678
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	281,744	457,077
Year two	339,615	939,175
Year three	1,068,351	506,766
Year four	433,195	58,840
Year five	35,092	54,646
Prior	95,412	31,021
Revolving Loans Amortized Cost Basis	83,578	81,662
Loans, net of unearned income	2,336,987	2,129,187
Current-period gross charge offs, year one	0
Current-period gross charge offs, year two	0
Current-period gross charge offs, year three	0
Current-period gross charge offs, year four	0
Current-period gross charge offs, year five	0
Current-period gross charge offs, prior	0
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	0
Real estate – construction and development | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	280,290	457,077
Year two	338,310	938,909
Year three	1,065,404	505,254
Year four	432,596	58,840
Year five	35,092	54,646
Prior	94,589	30,042
Revolving Loans Amortized Cost Basis	83,578	81,662
Loans, net of unearned income	2,329,859	2,126,430
Real estate – construction and development | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,454	0
Year two	1,226	0
Year three	2,931	0
Year four	67	0
Year five	0	0
Prior	290	479
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	5,968	479
Real estate – construction and development | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	79	266
Year three	16	1,512
Year four	532	0
Year five	0	0
Prior	533	500
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	1,160	2,278
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	89,702	450,743
Year two	468,685	1,908,047
Year three	2,098,659	2,202,740
Year four	2,153,752	1,093,395
Year five	1,091,096	801,946
Prior	2,106,572	1,502,677
Revolving Loans Amortized Cost Basis	95,168	100,206
Loans, net of unearned income	8,103,634	8,059,754
Current-period gross charge offs, year one	0
Current-period gross charge offs, year two	513
Current-period gross charge offs, year three	0
Current-period gross charge offs, year four	0
Current-period gross charge offs, year five	0
Current-period gross charge offs, prior	0
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	513
Real estate – commercial and farmland | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	89,702	450,315
Year two	466,153	1,890,498
Year three	2,081,414	2,133,833
Year four	2,133,812	1,090,735
Year five	1,072,326	765,640
Prior	2,010,066	1,437,323
Revolving Loans Amortized Cost Basis	95,168	100,206
Loans, net of unearned income	7,948,641	7,868,550
Real estate – commercial and farmland | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	1,359	17,131
Year three	56	53,329
Year four	3,502	0
Year five	14,839	30,200
Prior	76,168	46,370
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	95,924	147,030
Real estate – commercial and farmland | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	428
Year two	1,173	418
Year three	17,189	15,578
Year four	16,438	2,660
Year five	3,931	6,106
Prior	20,338	18,984
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	59,069	44,174
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	126,836	719,754
Year two	689,690	1,451,357
Year three	1,385,318	1,176,623
Year four	1,131,194	536,904
Year five	509,974	255,738
Prior	653,472	450,322
Revolving Loans Amortized Cost Basis	283,254	266,968
Loans, net of unearned income	4,779,738	4,857,666
Current-period gross charge offs, year one	0
Current-period gross charge offs, year two	0
Current-period gross charge offs, year three	21
Current-period gross charge offs, year four	0
Current-period gross charge offs, year five	0
Current-period gross charge offs, prior	5
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	26
Real estate – residential | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	126,638	714,684
Year two	673,422	1,425,186
Year three	1,352,544	1,148,092
Year four	1,098,997	506,137
Year five	483,248	236,147
Prior	612,181	423,648
Revolving Loans Amortized Cost Basis	278,384	262,968
Loans, net of unearned income	4,625,414	4,716,862
Real estate – residential | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	13
Year two	12	0
Year three	0	72
Year four	69	201
Year five	162	234
Prior	1,586	1,411
Revolving Loans Amortized Cost Basis	1,183	380
Loans, net of unearned income	3,012	2,311
Real estate – residential | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	198	5,057
Year two	16,256	26,171
Year three	32,774	28,459
Year four	32,128	30,566
Year five	26,564	19,357
Prior	39,705	25,263
Revolving Loans Amortized Cost Basis	3,687	3,620
Loans, net of unearned income	151,312	$ 138,493
Total Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current-period gross charge offs, year one	415
Current-period gross charge offs, year two	16,628
Current-period gross charge offs, year three	10,893
Current-period gross charge offs, year four	4,214
Current-period gross charge offs, year five	1,554
Current-period gross charge offs, prior	1,400
Current-period gross charge offs, revolving loans amortized cost basis	198
Current-period gross charge offs	$ 35,302