LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans by Risk Grade (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	$ 2,808,456	$ 3,520,850
Year two	2,116,249	5,111,112
Year three	5,232,577	4,336,679
Year four	3,954,136	1,988,570
Year five	1,816,338	1,209,250
Prior	3,032,186	2,289,160
Revolving Loans Amortized Cost Basis	2,005,039	1,813,682
Loans, net of unearned income	20,964,981	20,269,303
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	2,798,325	3,502,909
Year two	2,101,519	5,062,109
Year three	5,192,936	4,228,744
Year four	3,916,994	1,953,577
Year five	1,786,020	1,149,459
Prior	2,906,083	2,188,927
Revolving Loans Amortized Cost Basis	1,974,465	1,761,006
Loans, net of unearned income	20,676,342	19,846,731
Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	3,169	13
Year two	3,141	17,471
Year three	1,928	59,123
Year four	2,900	293
Year five	16,792	30,543
Prior	82,198	48,737
Revolving Loans Amortized Cost Basis	14,351	47,545
Loans, net of unearned income	124,479	203,725
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	6,962	17,928
Year two	11,589	31,532
Year three	37,713	48,812
Year four	34,242	34,700
Year five	13,526	29,248
Prior	43,905	51,496
Revolving Loans Amortized Cost Basis	16,223	5,131
Loans, net of unearned income	164,160	218,847
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	771,416	894,463
Year two	655,689	762,401
Year three	604,479	393,774
Year four	294,514	96,287
Year five	87,333	60,089
Prior	65,051	47,294
Revolving Loans Amortized Cost Basis	471,475	434,621
Loans, net of unearned income	2,949,957	2,688,929
Current-period gross charge offs, year one	286
Current-period gross charge offs, year two	15,849
Current-period gross charge offs, year three	15,380
Current-period gross charge offs, year four	6,699
Current-period gross charge offs, year five	1,178
Current-period gross charge offs, prior	758
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	40,150
Commercial, financial and agricultural | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	771,180	892,951
Year two	653,260	758,471
Year three	599,054	384,830
Year four	284,292	95,055
Year five	85,784	56,447
Prior	56,473	41,095
Revolving Loans Amortized Cost Basis	460,002	432,472
Loans, net of unearned income	2,910,045	2,661,321
Commercial, financial and agricultural | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	5	0
Year two	127	335
Year three	1,825	5,722
Year four	1,315	92
Year five	725	109
Prior	3,241	451
Revolving Loans Amortized Cost Basis	2,784	803
Loans, net of unearned income	10,022	7,512
Commercial, financial and agricultural | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	231	1,512
Year two	2,302	3,595
Year three	3,600	3,222
Year four	8,907	1,140
Year five	824	3,533
Prior	5,337	5,748
Revolving Loans Amortized Cost Basis	8,689	1,346
Loans, net of unearned income	29,890	20,096
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	44,364	44,890
Year two	22,056	17,847
Year three	10,730	5,919
Year four	3,080	25,988
Year five	19,384	16,035
Prior	28,188	21,494
Revolving Loans Amortized Cost Basis	82,508	109,379
Loans, net of unearned income	210,310	241,552
Current-period gross charge offs, year one	113
Current-period gross charge offs, year two	514
Current-period gross charge offs, year three	210
Current-period gross charge offs, year four	38
Current-period gross charge offs, year five	682
Current-period gross charge offs, prior	1,081
Current-period gross charge offs, revolving loans amortized cost basis	198
Current-period gross charge offs	2,836
Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	44,222	44,736
Year two	21,803	17,661
Year three	10,610	5,878
Year four	3,046	25,654
Year five	19,194	15,838
Prior	27,710	20,937
Revolving Loans Amortized Cost Basis	82,381	109,214
Loans, net of unearned income	208,966	239,918
Consumer | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	5	0
Year two	0	5
Year three	15	0
Year four	0	0
Year five	0	0
Prior	39	26
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	59	31
Consumer | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	137	154
Year two	253	181
Year three	105	41
Year four	34	334
Year five	190	197
Prior	439	531
Revolving Loans Amortized Cost Basis	127	165
Loans, net of unearned income	1,285	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	10,891	28,116
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	10,891	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	138
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	138
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	10,625	27,646
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	10,625	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	26
Revolving Loans Amortized Cost Basis	0
Loans, net of unearned income	26
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	240	470
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	240	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	985,910	818,728
Loans, net of unearned income	985,910	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	976,092	772,366
Loans, net of unearned income	976,092	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	9,818	46,362
Loans, net of unearned income	9,818	46,362
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	20,566	14,216
Year two	9,227	27,346
Year three	44,890	48,941
Year four	36,746	177,156
Year five	140,694	14,655
Prior	196,616	208,236
Revolving Loans Amortized Cost Basis	822	2,118
Loans, net of unearned income	449,561	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	20,566	14,216
Year two	9,227	27,346
Year three	44,890	48,941
Year four	36,746	177,156
Year five	140,694	14,655
Prior	196,616	208,236
Revolving Loans Amortized Cost Basis	822	2,118
Loans, net of unearned income	449,561	492,668
Premium finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,223,163	939,707
Year two	22,873	4,939
Year three	213	1,916
Year four	203	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	1,246,452	946,562
Current-period gross charge offs, year one	742
Current-period gross charge offs, year two	5,923
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	6,910
Premium finance | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,217,918	928,930
Year two	20,616	4,038
Year three	213	1,916
Year four	203	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	1,238,950	934,884
Premium finance | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	5,245	10,777
Year two	2,257	901
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	7,502	11,678
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	416,658	457,077
Year two	291,038	939,175
Year three	1,029,265	506,766
Year four	323,846	58,840
Year five	4,550	54,646
Prior	92,679	31,021
Revolving Loans Amortized Cost Basis	74,078	81,662
Loans, net of unearned income	2,232,114	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	413,449	457,077
Year two	289,316	938,909
Year three	1,025,891	505,254
Year four	323,413	58,840
Year five	4,550	54,646
Prior	91,834	30,042
Revolving Loans Amortized Cost Basis	74,078	81,662
Loans, net of unearned income	2,222,531	2,126,430
Real estate – construction and development | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	3,159	0
Year two	1,643	0
Year three	0	0
Year four	66	0
Year five	0	0
Prior	317	479
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	5,185	479
Real estate – construction and development | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	50	0
Year two	79	266
Year three	3,374	1,512
Year four	367	0
Year five	0	0
Prior	528	500
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	4,398	2,278
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	166,867	450,743
Year two	460,480	1,908,047
Year three	2,208,928	2,202,740
Year four	2,212,094	1,093,395
Year five	1,080,923	801,946
Prior	2,026,212	1,502,677
Revolving Loans Amortized Cost Basis	94,477	100,206
Loans, net of unearned income	8,249,981	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	58
Current-period gross charge offs, revolving loans amortized cost basis	0
Current-period gross charge offs	571
Real estate – commercial and farmland | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	166,867	450,315
Year two	457,998	1,890,498
Year three	2,191,571	2,133,833
Year four	2,197,460	1,090,735
Year five	1,062,050	765,640
Prior	1,935,670	1,437,323
Revolving Loans Amortized Cost Basis	94,477	100,206
Loans, net of unearned income	8,106,093	7,868,550
Real estate – commercial and farmland | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	1,360	17,131
Year three	35	53,329
Year four	756	0
Year five	15,471	30,200
Prior	76,613	46,370
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	94,235	147,030
Real estate – commercial and farmland | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	428
Year two	1,122	418
Year three	17,322	15,578
Year four	13,878	2,660
Year five	3,402	6,106
Prior	13,929	18,984
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	49,653	44,174
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	165,422	719,754
Year two	654,886	1,451,357
Year three	1,334,072	1,176,623
Year four	1,083,653	536,904
Year five	483,454	255,738
Prior	612,549	450,322
Revolving Loans Amortized Cost Basis	295,769	266,968
Loans, net of unearned income	4,629,805	4,857,666
Current-period gross charge offs, year one	0
Current-period gross charge offs, year two	24
Current-period gross charge offs, year three	20
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	49
Real estate – residential | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	164,123	714,684
Year two	649,299	1,425,186
Year three	1,320,707	1,148,092
Year four	1,071,834	506,137
Year five	473,748	236,147
Prior	587,155	423,648
Revolving Loans Amortized Cost Basis	286,613	262,968
Loans, net of unearned income	4,553,479	4,716,862
Real estate – residential | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	13
Year two	11	0
Year three	53	72
Year four	763	201
Year five	596	234
Prior	1,962	1,411
Revolving Loans Amortized Cost Basis	1,749	380
Loans, net of unearned income	5,134	2,311
Real estate – residential | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,299	5,057
Year two	5,576	26,171
Year three	13,312	28,459
Year four	11,056	30,566
Year five	9,110	19,357
Prior	23,432	25,263
Revolving Loans Amortized Cost Basis	7,407	3,620
Loans, net of unearned income	71,192	$ 138,493
Total Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current-period gross charge offs, year one	1,141
Current-period gross charge offs, year two	22,823
Current-period gross charge offs, year three	15,855
Current-period gross charge offs, year four	6,737
Current-period gross charge offs, year five	1,860
Current-period gross charge offs, prior	2,040
Current-period gross charge offs, revolving loans amortized cost basis	198
Current-period gross charge offs	$ 50,654